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HUME, David, one of the most celebrated historians and philosophers of Great Britain, has already been twice noticed in the Preliminary Dissertations, where the principal doctrines of his metaphysics have been considered by Stewart, and those of his ethics by Mackintosh. This, happily, exempts the writer of the present article from touch¬ ing on the same topics, except incidentally. But as the life and character of other celebrated men, no less prominent in the Dissertations, have been formally treated in the body of this work, it seemed due to the memory of Hume to give his biography a little more fully than in the few paragraphs dedi¬ cated to him in the previous editions; and the following sketch has therefore been inserted. It will be restricted to a brief account of his life and genius, an estimate of his merits as a writer, and probably a glance at one or two of such of his philosophical opinions as were too remote from the design of either Dissertation to challenge notice there, but yet may seem of sufficient importance to be referred to. Hume has left us a very short autobiographic sketch of his own life ; it is too scanty, too bare of details, to in¬ spire the interest which belongs to some similar memoirs, that of Gibbon for example. But though it is little more than a catalogue of dates and facts, the author offers a good apology for his conciseness :—“ It is difficult, he says, for a man to speak long of himself without vanity. Heassuies the reader that the notice shall contain little more than the history of his writings, and he has kept his word. From all danger of vanity in treating such topics—however de¬ licate for an author—he flattered himself he had security in his eax\y failures “ The first success of my writings,” says he, “was not such as to be an object of vanity.” Yet ^ the acerbity with which at that so distant day he remem¬ bers and records the slow steps by which he had emerged from obscurity into fame, and which all that fame had not been able to soothe, would seem to indicate that the philo¬ sopher had not quite so effectually mortified his vanity as he imagined. The tardy homage which the public paid to his merits is a theme to which he never tired of le- curring, though, as will be seen in the sequel, not very rea¬ sonably.1 TT. _ , He was born at Edinburgh, April 26, 1711. His father was a scion of the house of the Earl of Home, or Hume, as the name was often spelt, and as our philosopher, in opposition to his brother’s orthographic heterodoxy, always persisted in spelling it. His mother was daughter of Sir David Fal¬ coner, president of the College of Justice. His father died when he was a child; his mother, of whom he speaks in the fondest terms, was long spared to him, and well deserved the tribute of affection he pays her. “ Though young and handsome, she devoted herself entirely to the rearing and education of her children.” At the age of fifteen he was sent to the University of Edinburgh, and he tells us, what none will doubt,’ that he passed through the usual “ course of education with success ;” though his reading was marked at that time—and as regards the classics, was always marked—rather by extent than by accurate scholar¬ ship. Even at that early age he was possessed with an in¬ tense love of literature, and by that ambition of literary dis- Hume, David. 1 « Every new edition wa, only an acknowledgment of the njua ce which had been done h.m and a P»o .""ment of hm ^ . . . Hime at last wore out the patience of hi. very publi.h.r” (Ed. Rm.. Jan. 1847) ^ to “e*P7“!“0"0rty ’»„ guide, 1 do blockheads who call themselves the public,” thus he writes (1757) “ and whom a bookseller, a lord, a priest, or party can g , most heartily despise it.” ^ VOL. XII. Plume, David. tinction which was the ruling passion, not to say the only passion, of his life. Seldom, if ever, has the propensity to — a studious life developed itself so early or so exclusively, or asserted its claims so imperiously. From the very firsthand all along, it overmastered everything in the shape of plea¬ sure or interest that could be brought into competition with it. As a younger brother, and a younger brotherof no opulent house, he w^as, of course, to carve out his own fortunes in the world. “ My patrimony,” he says, “ after the manner of my country, was but slender yet no lures, no exio-en- cies could induce him to seek fortune at the expense of literature. In this case, the phlegm of the young philoso¬ pher seemed, in its way, as immovable as the enthusiasm of a young poet frequently proves; he could not, as the world would say, calculate consequences. To add to the wonder, Hume was most creditably anxious for indepen¬ dence, and resolved, at whatever costs of economy, to possess it. Nay, as his after-life showed, our philosopher was by no means insensible to the advantages of wealth; never¬ theless, he was unwilling to adopt any course to attain i idles at the expense of those literary pursuits which much more frequenUy conduct to penury. Thus all the schemes Ins friends formed on his behalf were frustrated by this one passion. His “ studious habits, sobriety, and industry, led them to wish that he should devote himself to the law,” in which surely these qualities, in conjunction with his sur¬ passing acuteness and subtilty, might have easily won dis¬ tinction ; but while “ they fancied he was poring over Voet and v inmus Cicero and Virgil were the authors he was secretly devouring.” An experiment in mercantile life was equally unsuccessful. In 1734 he went to Bristol with introducUons to “ eminent merchants” in that city, but he found this “ scene utterly unsuitable.” He then exiled himself to France; and first at Rheims, then at La Fleche devoted himself, in studious solitude, to literature and phi- losophy. During this time he made a “ rigid frugality sup¬ ply the deficiencies of fortune” (a course to which he re¬ solutely adhered till the dawn of better days); and with singular decision of character, and obedience to the rulino- passion, “ regarded every object as contemptible except the improvement of his talents for literature.” In this interval ie meditated and composed his Treatise of Human Nature. I his work was completed by his twenty-fifth year, and, as the production of so young a mind, must certainly be re¬ garded as a prodigy of metaphysical acuteness. Indeed there is reason to believe that the results of his speculation (if scepticism allow the term) must have been arrived at Jong before, even from his boyish days. In the account he gives of himself in that remarkable letter, first published by Mr Burton vol. i, pp. 31-39), in which he anonymously consults a physician in relation to some singular but very prolonged hypochondrical affection (itself, probably, both symptom and effect of an overwrought mind), he discloses a style of thought and points to a method of speculation which strongly remind us of the conditions of mind under which escartes commenced philosopher. Were there any proofs (as iere are certainly none) of his acquaintance with Des- cartes writings at this early age, it would have seemed almost on thT u 1 ]S mC,th?d !>f P]lllosoP]iizmg was sheer imitation ; other ha"d, i this letter had been written after his residence at La Fleche, where Descartes felt so similarly, the same conclusion would have been inevitable. From this let- SLa, •£\CUe t0 fudl in thf character of his mind and its a P’ iT °f ltSi ti,ndencies t0 morbid speculation at a veiy eaily date, we shall presently give some extracts. Hume to London with his Treatise on Human Nature; m the next year published it. “ Never iterary attempt, he says, “ was more unfortunate ; it fell dead-born from the press, without reaching such distinction as even to excite a murmur.” He declares, however hat being naturally of a cheerful temper, he soon recovered HUME. fiom this and similar subsequent disappointments. Yet it is clear from the details in Burton’s Life, that the equani¬ mity of our philosopher was sorely tried ; that he had, with the exaggerations natural in a young author, been expect¬ ing that the world would have little to do for a time, ex- cept to read his lucubrations ! He tells his friend Ramsay, that he would not aim at anything until he could judge of ms success in his grand undertaking, and see upon what foot¬ ing he w-as to stand in the world;” and as the day of pub¬ lication drew near, confesses to being perturbed at “ the nearness and greatness of the event.” Yet it is certain that he bore the disappointment of his hopes on this occasion much better than he did some far lighter failures of the same kind. Cheerful as might be his temper, buoyant as were his hopes, his mortifications of this sort, and espe¬ cially that which befell him when he published the first volume of his History, were keenly felt and remembered, and engendered prejudices against the Public,” which little became a philosopher, and utterly prevented him from doinp- the said “ Public” justice. Properly speaking, he never forgave its early neglect, and could not see that he had not been a very ill-used man, even when fame and com¬ petency had rewarded his at first unpromising labours* In the case of the Treatise of Human Nature, however, he himself admits, that in fact the public was in the right; which, indeed, any one would naturally expect, seeing that the philosopher was but five-and-twenty, and his philoso¬ phy the product of that mature age ! That he was not in¬ sensible that his failure in the first instance was more attri¬ butable to himself than to the world is significantly shown by his acknowledgment of indiscretion in going to press so early. f bad always,” he says, “entertained a notion, that my want of success in publishing the Treatise of Human Nature, had proceeded more from the manner than the matter” (equally from both, the public would say), “ and that I had been guilty^of a very usual indiscretion in going to the press too early. He tells us, he “ set about remedying its defects.” He cast the first part of it entirely anew in the Enquiry concerning Human Understanding, published 1747; but this, he confesses, had little more success than the former. In fact, he was still but serving his apprenticeship to fame— which many a man, as great, has had to do for a much longer period. In 1742, he published the first part of his Essays. Ihese, which were buoyed up by large intermixture of more attractive topics than those of the Treatise, and were recommended by the fascinations of a far more finished style, met with a better reception, and they have since been ahvays popular. 1 he second edition, however, did not o-q off rapidly enough to satisfy the exacting temper of the author.—After publishing the Treatise, he lived for some time with his brother in Scotland, still ardently pursuing his literary occupations. I his mode of life was not very agreeably diversified by the temporary charge of the half- mad, or at least wholly hypochondriacal Earl of Annandale (1745). M hether tutor or keeper be the more proper term for our philosopher during a year of very humiliating servitude, it seems hard to say. His next post (1747) was that of secretary to General St Clair, whom he accompanied rp in. military embassy to the courts of Vienna and 1 unn. He was introduced, he tells us, as aid-de-camp to the general, and wore the uniform of an officer,—a droll transformation for our ungainly philosopher. Two years were thus spent, almost the only years of his life, he declares, in which he was “ estranged from literature.” Total estrange¬ ment can hardly be supposed, nor does one see any reason for it. If it were so, the military uniform in his case must have done more than even the active duties of a soldier’s life could do in that of Gibbon, in whom the passion for litera¬ ture was, however, still more ardent than in Hume. Gib¬ bon s account, in X\\s, Journal, of the absolute possession which history had taken of him, of the enthusiasm with which Hume, David. II u Hume, he indulged dreams of literary ambition and pursued his David, studies even in his tent, affords a striking instanee of the “ rulinp- passion.” But if Hume’s occupations estranged him for*a while from literature, the emoluments of his office were not to be despised; they so materially aided his very limited resources, that he sometimes pleasantly talked to his smiling friends of having achieved independent for¬ tune : “ I was now,” says he, “master of near a thousand pounds!” In 1749, he again repaired to his brother’s house, where he took up his abode for two years. He spent his leisure in composing the second part of his essays, which he called Political Discourses, and his Enquiry concerning the Prin¬ ciples of Morals. His publisher now' told him, that his writings, “all but the unfortunate Treatise, were beginning to be asked for and talked about.” “ It was a hopeful symptom too,” he tells us, “ that answers by reverends and right reverends came out two or three in a year;” and that he “ found, by Dr Warburton’s railing, that the books were beginning to be esteemed in good company.” In 1751, he removed from the country to Edinburgh, under the notion that the “ capital was the true scene for a man of letters;” and in the following year he published the Political Discourses; “ the only work of mine,” says he, “ that was successful on the first publication.” It is difficult to say what is the criterion of success in the estimate of un¬ reasonable expectation ; but Hume was still a young writer, and he certainly had no reason to complain of the reception of the first part of his Essays. Conscious of power, he was too impatient for fame, and forgot that fame is a thing of slow growth; he wished to see the oak rise immediately from the acorn. Meantime, grumble as he might, his sap¬ lings, in the estimate of any sober judge, would be thought to be doing well enough. In the same year, he published in London, his Enquiry concerning the Principles of Morals, of which he hesitates not to say, that “ of all his writings, philosophical, literary, or historical, it is incomparably the best.” Hume wondered that Rousseau should prefer his Emile to his Heloise, and compares it to Milton’s preference of his Paradise Regained to his Paradise Lost. Whether Hume himself be not another instance of a similar delusion, many readers will have their doubts. But much will depend on what is meant by “best.” If Hume meant by “best,” that the Enquiry was the most original and acute of his writings, that which displayed most poioer, posterity will hardly affirm his verdict; if by “ best,” he meant, that of all his writings, it is most free from paradox and error, it will probably be granted. Sir James Mackintosh has observed, that “ it is creditable to him that he deliberately pre¬ ferred the treatise which is least tainted with paradox, though the least original of all his writings.” Sir James contends, however, for its pre-eminent excellence of style. For a very able criticism of its merits and defects, the reader is referred to the second Dissertation. In 1752, Hume was appointed librarian to the Faculty of Advocates. The chief immediate value of the office, to which little or no emolument was attached, consisted in the access it afforded to a large library ; indirectly, it was of greater advantage, as this last circumstance encouraged, if it did not suggest, his writing the History of England. Terri¬ fied, however, with the magnitude of the task, dreading, as he well might, to begin, after the orthodox manner, with the landing of Julius Caesar, he commenced with the accession of the Stuarts, “ an epoch,” he thought, “ when the mis¬ representations began chiefly to take place;” but which, let ME. 3 them be what they would, could hardly transcend his own. Hume, His anticipations of success were, as in former cases, san- David, guine, and he was doomed, for a while, to see the usual frustration of his hopes. “ Miserable,” says he, “ was my disappointment; I was assailed by one cry of reproach, dis¬ appointment, and even execration. English, Scotch, and Irish; Whig and Tory, churchman and sectary, freethinker and religionist, united in their rage against the one man who had presumed to shed a generous tear for the fate of Charles I. and the Earl of Strafford.” Hume’s indignation makes a droll mis-estimate of his own enormous delin¬ quencies. If he had exercised common justice and impar¬ tiality, to say nothing of “ generosity,” in other cases, the few “ generous tears” which the unwontedly sentimental sceptic could have managed to distil for Strafford or Charles, would never have given such mortal offence. It was yet more mortifying to the author, that the furious storm which greeted the first appearance of the work, subsided into a more vexatious calm ; for what man would not sooner be railed at than forgotten ? The History seemed doomed to oblivion. The publisher assured Hume, that “ in a year he sold but forty-five copies.” Hume himself confesses, that with two “ odd exceptions,”—the Primates of England and Ireland,—he scarcely heard of any man of rank or letters who “ could endure the book;” and that had it not been for the breaking out of the war with France (in spite of the “ cheerful temper” with which he would have us be¬ lieve his philosophy took such things!), he would have sought an asylum there, and changing his name, for ever renounced his country !1 As it was, his country was spared this dire infliction. Meantime, Hume persevered, and his second volume which appeared two years afterwards had somewhat better success. In 1759, he published, according to the retrograde course in which he had commenced, the history of the House ot Tudor, which also was received with a storm of disappro¬ bation. But if we may trust his own averment, he was now “ callous against the impression of public folly;” and gave the early history in two more volumes in 1761, “ with tolerable, and but tolerable, success.” But that his complaints of want of success >. vre, on the whole, unreasonable, is evident from his own statement, namely, that in spite of all “ public folly,” “ the copy-money given him by the booksellers much exceeded anything fbx-- merly known in England.” In fact he had been, as usual, too impatient of success. But even when he had become, and in a large degree from his literary labours, “ not only independent, but-opulent” according to his truly philoso¬ phical scale of riches,—he never forgave the “ public folly” for not instantaneously recognising his merits. Though his History had grievous defects, which he took care, n the indulgence of his prejudices (continually strengthen¬ ing with opposition;, to aggravate in every successive edition, it had also singular merits, and was secure of the popularity which the impatience of its author thought so tardy. It was nearly the first modern example of history treated in a philosophical spirit, while the charms of its unrivalled style would alone have insured its success. In the interval between the first and second volumes of his History he published his Natural History of Religion ; of which he says “ the public entry was obscure;” its con¬ tents, acute as the treatise is, need not leave us in any won¬ der at that. For this neglect, however, he assures us he received consolation, in the shape of “ a pamphlet by Dr Hurd, written with all the illiberal petulance, arrogance, and scurrility, which distinguish the Warburtonian school.” 1 On a subsequent occasion, when complaining of the tardiness of his political patrons, Hume repeated this sort of threat.—“ The fuming incense,” says the critic id the Ed. Review (1847), “ which the Parisians were offering him as a sort of male Goddess of Reason must have intoxicated him, or he never would have closed a letter with the formal notice,—‘ I have been accustomed to meet with nothing hut insults and indignities from my native country ; hut if it continue so, ‘ ingrata patria, ne ossa quidem hahehis.' ” 4 HUME. Hume, 1 he consolation, from this mode of speaking of it, would David. not seem very soothing. —Hume was now (1761) fifty years of age, and meditated a philosophical retreat in Edinburgh for the rest of his days ; but on receiving an invitation from Lord Hertford to attend him in his embassy to Paris, with the prospect of secretary¬ ship to the embassy, he, after some hesitation, consented. He was soon appointed secretary, and in 1765, when Lord Hertford was made lord-lieutenant of Ireland, was left at Paris as Charge cTAffaires till the new ambassador, the Duke of Richmond, arrived. In 1766 he returned to Edin¬ burgh, “ not richer? he pleasantly says, “ hut with much more money” During his residence in Paris, he was not only welcome, he was the rage. In spite of his philosophic shyness, his destitution of all personal graces and charm of manner, and even in spite of his French—French which only French po¬ liteness could have heard without laughing—he was over¬ whelmed with the most flattering attentions of combined rank and genius, youth and beauty. “ The more I resiled from these excessive civilities,” says he, “the more I was loaded with them.” It is evident, nevertheless, from many expressions, that this homage was not a little soothing to our philosopher’s complacency, and often excited a flutter of vanity which his philosophy would hardly have approved; and he would as certainly have been cured of it, had he been duly conscious of the ridiculous position in which his worshippers often placed him. “ From what has been al¬ ready said of him,” says Lord Charlemont, “ it is apparent that his conversation to strangers, and particularly to French¬ men, could be little delightful, and still more particularly, one would suppose, to French women; and yet no lady’s toilette was complete without Hume’s attendance. At the opera his broad unmeaning face was usually seen entre deux jolis minois. The ladies in France gave the ton, and the ton was deism ; a species of philosophy ill suited to the softer sex, in whose delicate frame weakness is interesting, and timidity a charm. . . How my friend Hume was able to endure the encounter of these French female Ti¬ tans, I know not.”1 Some of the scenes in which fashion¬ able society doomed him to enact a part, must have been exquisitely comic; and had his friends intended to ridi¬ cule, not to honour him, they could hardly have devised any thing better adapted to the purpose. The scene described so vividly by Madame D’Epinay, must surely have been abundantly trying. We have hardly space for the passage, but it is so graphic, and indeed so instructive, that we can¬ not resist the temptation to give an abridged translation below.2 On another occasion, still more trying to his gra¬ vity, if not to his modesty, he was compelled to listen to complimentary harangues from the Dauphin’s children,— the youngest of the child-orators unhappily breaking down in the middle of his address; we shall give the scene in Hume’s own vein of quiet pleasantry. It is clear that, however flat- Hume, teied by the homage he received, as other expressions in his Ravid. letters prove, he was by no means insensible to the absur- » dity of the situation in which the extravagance of adula¬ tion sometimes placed him. “ Do you ask me,” says he, about my course of life ? I can only say that I eat no¬ thing but ambrosia, drink nothing but nectar, breathe no¬ thing but incense, and tread on nothing but flowers. Every man I meet, and still more, every lady, would think they were wanting in the most indispensable duty, if they did not make a long and elaborate harangue in my praise. What happened last week, when I had the honour of being pre¬ sented to the D n’s children, at Versailles, is one of the most curious scenes I have yet passed through. The Due de B., the eldest, a boy of ten years old, stepped forth and told me how many friends and admirers I had in this coun¬ try, and that he reckoned himself in the number, from the pleasure he had received from the reading of many pas¬ sages in my works. When he had finished, his brother, the Count de P., who is two years younger, began his discourse, and informed me that I had been long and impatiently ex¬ pected in France; and that he himself expected soon to have great satisfaction from the reading of my fine History. But what is more curious, when I was carried thence to the Count D’A., who is but four years of age, I heard him mum¬ ble something which, though he had forgot in the way, I conjectured from some scattered words, to have been also a panegyric dictated to him. Nothing could more surprise my friends, the Parisian philosophers, than this incident.”3 The French of Hume could scarcely have been so bad as the malicious wit of Horace Walpole has represented it; if it was, it is hard to believe that, however prone may have been the French just at that moment to admire, he should have been able to get on in the saloons of Paris at all. Even French civility could hardly have kept its countenance. That it did not refrain from sarcasm we have some proofs, while Hume’s English acquaintance exercised it abun¬ dantly. “ The French,” says Walpole with his customary cynicism, “ believe in Mr Hume ; the only thing in the world that they believe implicitly; for I defy them to un¬ derstand any language which he speaks.” And in a letter first published in the Suffolk Correspondence, he says, with still more reckless causticity, “ as every thing English is in fashion, our bad French is accepted into the bargain. Many of us are received everywhere. Mr Hume is fashion itself, although his French is almost as unintelligible as his Eng¬ lish.” It is not Walpole only, however, that makes himself merry with the philosopher’s French. One of Rousseau’s suspicions of Hume was founded on a few w ords of French which he uttered in his sleep. Hume remarked that he was not aware that he dreamt in French; “ He could not,” quietly said M. Morellet. Of his quarrel with Rousseau, which made so much noise v a pn 7 P; 223. To which we may add the following from Grimm’s Correspondance s’est plus dans W soci^^ nw plalS™t’A ^ ^ 86 le 8°nt arrach6’ et » i-paWly. • . . Sine, then he h.. W to X p« rathe^forpMlosophidis'rdTvTfo^hplF11^ fattered- \D ^ tke part he here is most a'n using. Unfortunately for him, or atner lor pmiosoptuc dignity (for he seems to accommodate himself very well to this mode of life), there was no rulinn- mania in this he^ YurtrtowaTdrhir ^lUhl p^ttCirCUm8tanCeS ^ Up°n aS a neW'f-nd and the enThusiastf oTour young eads turned towards him. All the pretty women are mad about him ; he is at all the fine suppers, and there is no nood fdte without p 284) ‘ Well mtht awrifeFin the Iff' ^ GeneVaSe are t0 me” i^ires et CorZpondance de Madame d’ZpInay, vol. iii., a 1-fours and hi™ mistrer; dinF on hh back^hT ^ ^ exhibition of the old of Aristotle in love-down upon portrait ’of 110^ ^ M^m^ °f ^ ^ ^ 5 HUME. Hume, at the time of its occurrence both in England and France, David. Hume, in the little sketch of his life, which comes up to within a short period of his death, says not one syllable. It certainly was not from thinking it of no importance, for it gave him a world of vexation ; indeed he confessed it was one of the most painful, as well as the most extraordinary that had ever happened to him. It was perhaps partly from unpleasant remembrances, that he passed it by ; but also probably from a more creditable motive. Angry, and justly angry as he had felt at Rousseau’s ingrati¬ tude and absurdity—unphilosophically virulent as his lan¬ guage1 had sometimes been, he doubtless felt inclined as time rolled on, to acquiesce in the view since generally taken, namely, that the French philosopher’s “egotism” and “ sentimentality” were not seldom undistinguishable from madness; and whether they had produced it or resulted from it might be a fair question. Of the whole quarrel, a most copious and interesting account will be found in Burton’s Life of Hume ; and it is no more than just to say that Hume comes out of it in a manner highly creditable not only to his honour but to his benevolence. His friends in France had forewarned him what a monster of intractable caprice and infinite egotism he was patronizing ;—all which he found out when it was too late. Surely the scene which he himself paints with so much vividness, in which Rous¬ seau, after fantastically misinterpreting an act of kindness into the most villainous malignity, suddenly relents, pops down into the surprised philosopher’s lap, and sobs and blub¬ bers out his momentary repentance amidst tears and kisses, —repentance soon to be followed by a relapse into as capri¬ cious resentment,—presents a picture of Rousseau, of which it is hard to say whether it be more pitiable or ludicrous; while we may easily conceive that to one of so “ unsenti¬ mental” a nature as Hume, his involuntary ro/e in so ridi¬ culously “ tender a scene” must have been profoundly mor¬ tifying. “ I endeavoured,” says Hume, “ to pacify you, and to divert the discourse, but to no purpose. You sat sullen, and was either silent, or made me very peevish answers. At last you rose up and took a turn or two about the room, when all of a sudden, and to my great surprise, you clapped yourself on my knee, threw your arms about my neck, kissed me with seeming ardour, and bedewed my face with tears. I was very much affected, I own ; and I believe a very tender scene passed between us.” The de¬ scription of Rousseau is, as may be expected, still richer.2 After about two more years (1767-1769) of political ser¬ vice as under-secretary, a post to which he was preferred by General Conway, Hume finally retired to Edinburgh, and there anticipated a calm philosophic evening of life in the midst of his favourite society. To use his own words he was “ very opulent,” having a revenue of L.1000 a-year. His society was much courted by men of the highest lite¬ rary reputation, and of the widest diversity of opinions, both political and religious. Freed from literary and all other cares, he entertained, “ though somewhat stricken in years, the prospect of enjoying long his ease, and seeing the in¬ crease of his reputation.” These hopes were fallacious. In 1775 appeared the first symptoms of that long decay which terminated in his death, August 1776. It is but justice to say that all concurrent testimony proves him to have borne this slow and harassing, though, it seems, by no means painful illness, not only with exem¬ plary fortitude and patience, but with much sweetness of temper, and to have contemplated the great change with undiminished serenity. Convinced that his disease was in¬ curable long before his friends would believe it, he refused Hume, to listen to false predictions of returning health. When Dr David- Dundas intimated that he should tell his friend Colonel Elphinstone that he “ was much better, and in a fair way of recovery,” Hume replied, “ Doctor, as I believe you would not choose to tell anything but the truth, you had better tell him that I am dying as fast as my worst enemies, if I have any, could wish, and as easily as my best friends could desire.” Sometimes, it is true, he regarded the approach of the last moment with a hilarity strangely unbecoming his situ¬ ation, whether as a philosopher or a man ; and his ill-timed pleasantry about Charon’s boat might well have been spared. John Foster, in his review of Ritchie’s Xj/e of the philosopher, has observed, that even on the hypothesis that death is an extinction of our being, much more on that of Hume’s scepticism, which left it uncertain whether death might not reveal the truth of what he had been doubting all his life long, anything bordering on levity in such an hour is utterly out of place. It is as though a man should laugh and caper in the cave of Trophonius. But, in other respects, it cannot be denied that Hume’s last hours exhibit a serenity which, though often exempli¬ fied by religion, has rarely been exhibited by philosophy, and still more rarely by a sceptical philosophy. Foolish inferences have been founded on what cannot without gross disingenuousness be denied—the philosophic fortitude and tranquillityof Hume’s death,—and equally fool¬ ish attempts made to prove all that fortitude and tranquillity affectation. Experience ought to convince us that nothing can be inferred as to the adaptation of this or that system of philosophy or religion to produce calmness in a dying hour, from the phenomena of any individual death-bed. The best men have often encountered the great enemy with dismay, and the worst with tranquillity. We can as little infer from their conduct what death is to disclose, as we could infer what is at the bottom of a deep abyss, if we saw that, of a thousand men who were compelled to leap into it, some madly laughed, and some pusillanimously wept on the brink, before making the inevitable plunge. It should be sufficient to vindicate the superiority of at least a Christian’s faith to every form of scepticism, that if he has really lived in accordance with his hopes and convic¬ tions, the natural tendency of his sentiments and conduct is to produce tranquillity at the last hour, whether, from physical causes, he attains that tranquillity or not; and that his “ immortal hopes”—even if they were to prove delu¬ sions—are as naturally connected with a peaceful close of the great strife as any other cause with its effect. Nothing can be more true than the pointed declaration of Lord Byron : “ Indisputably the firm believers in the Gospel have a great advantage over all others, for this simple reason, that, if true, they will have their reward hereafter; and, if there be no hereafter, they can be but with the infidel in his eternal sleep, having had the assistance of an exalted hope, through life, without subsequent disappointment, since (at the worst for them) £ out of nothing nothing can arise, not even sorrow.’ ” On the other hand, even the least candid of sceptics will acknowledge that there is nothing in scepticism itself— least of all in such radical, devastating scepticism as that of Hume—naturally calculated to soothe a dying hour. Though a sceptic may meet it with tranquillity, from frigi¬ dity of temperament or hardihood of character, or fixed aversion to look at the future, or from a too complacent estimate of his own worth,3 or a deficient moral sensibility, or from many other reasons, assuredly there is nothing in 1 In the celebrated introduction to the letter to Baron d’Holbach. in which Hume first explodes in wrath, he says, “ Mon cher Baron, Jean Jacques est un scelerat.” 2 Burton, vol. ii., p. 342. 3 Hume certainly pronounces his own eloge with sutficient confidence : “ My friends,” says he in his autobiography, “ never had 6 H U M E. Hume, the native tendency of a sceptic’s sentiments to render a David, death-bed more tolerable. And that such is the natural impotence of sceptical philo¬ sophy for all such purposes, would seem to be indicated by the frequent appeal of sceptics to this “ instantia solitaria” of Hume’s death-bed. The rarity of the phenomenon neutralizes it as an argument; if, like the calm or triumphant deaths of consistently religious men, such a phenomenon were too com¬ mon to be specially noted at all, it would be something to the purpose. For Hume’s scepticism, charity, we think, may blamelessly make ampler excuse than the generality of readers have been disposed to make. One may suspect, considering its remarkably early, uniform, and inveterate character, that it had to do profoundly with the very structure of his intellect, and was ab origine far more involuntary than is generally the case. It may, in our opinion, be even surmised that it was connected with that singular morbid condition from which he suffered so much at so early an age. The very curious document in which he discloses so freely the symp¬ toms which oppressed him has been already referred to, and the brief citations we proposed to give will be found below; but the whole letter, first published in Bur¬ ton s Life, is well worthy of perusal in extenso. It reveals a condition of mind, considering the writer’s extreme youth, at least as unhealthy as that of the body. At an age when other youths are for the most part only too credulous he was entertaining universal doubt; and when others are full of nothing but poetry and love, he was presumptuously ex¬ ploring the deepest problems that can engage the human intellect, and declaring that nothing certain was yet estab¬ lished in philosophy or morals ! At the very time that he was labouring under the cloud of hypochondriacal depres¬ sion, referred to in the letter from which we give extracts below, he was intensely excogitating his philosophy. His whole state was unnatural.1 At the early age of twenty-two or twenty-three, his phi¬ losophical opinions were already nearly complete—that is, when he had hardly advanced beyond boyhood. His sceptical tendencies,—thus deeply radicated, and indulged at an age so portentously early,—everything in his nature tended to confii m, and nothing in his experience and subsequent his¬ tory tended to correct. He was of a naturally frigid tem¬ perament, entirely without enthusiasm,—with little sym¬ pathy for the lofty or heroic in sentiment or character. Nor, in his after life, was there anything to develope any latent germs of such qualities; he never passed through those agitating scenes of absorbing love, or joy, or sorrow, or hope, or fear, which form the discipline of life, and so often pro¬ foundly modify, and even revolutionize, the human charac¬ ter ; which often develope qualities not suspected to exist, or shiver into atoms the sentiments and opinions formed in youthful inexperience. With only one dominant passion, as he himself admits,—that ambition of literary distinction,which tended rather to inflame than correct his early love of daz¬ zling paradox,—he passed life in respectable epicurean tran¬ quillity. A most commendable frugality made him content in youth with very little; he saw, as years rolled on, increasing prosperity in every desirable form,—an income which his moderation counted wealth, a steadily increasino- reputation, “troops of friends,” flatteries, uninterrupted health, and, in a word, everything that could lay to sleep (as prosperity very generally does) the susceptibilities and emotions of man’s spiritual nature. His bark sailed on a smooth sea, and encountered none of those shocks or tem¬ pests which, more than most things, make the voyager of life consider whether his ship is constructed and equipped as well for the storm as for the calm. It may be added, that so habitually deficient is Hume in the sentiment of veneration,—so unnatural the apathy with which he regards religious phenomena,—so easy, apparently, the entire ex¬ trusion of the subject from his thoughts,—so frightfully contented does he seem with his scepticism,—that, though this state of mind was encouraged, no doubt, by the too con¬ genial atmosphere of his age, and the French society he loved, it is difficult not to infer some abnormality in the very original structure of his moral nature ; and it is the kindest apology that can be made for him. On any other hypothesis, he cannot be too severely cen¬ sured for the indolent facility with which he seems to have ac- Hume, David. occasion to vindicate any one circumstance of my character and conduct.” If by this he meant to claim exemption only from flagrant vice there are few decent characters in life who could not say as much; but, with a deeper self-knowledge and profounder moral sen¬ sibility, most men would own that they were conscious of too many failings which men knew not, and which God only knew, to permit them to plume themselves on any such grounds. But of the ordinary infirmities of man, and especially of the subtle spiritual vices of pride, vain glory, presumption, and prejudice, the biography and character of Hume present as little lack as those of other men. 1 “ Bvery one who is acquainted either with the philosophers or critics knows thatthere is nothing yet established in either of these two sciences, and that they contain little more than endless disputes, even in the most fundamental articles. Upon examination of these I found a certain boldness of temper growing in me, which was not inclined to submit to any authority in these subjects, but led me to seek out some new medium by which truth might be established. After much study and reflection on this, at last, when I was about eighteen years of age, there seemed to be opened up to me a new scene of thought, which transported me beyond measure, and made me, with an ardour natural to young men, throw up every other pleasure or business to apply entirely to it. . . . I was infinitely happy in this course of life for some months ; till at last, about the beginning of September 1729, all my ardour seemed in a moment to be extinguished, and I could no longer raise my mind to that pitch which formerly gave me such excessive pleasure In this condition I remained for nine months very uneasy to myself, as you may well imagine, but without growing any worse, which was a miracle. .... Though I was sorry to find myself engaged with so tedious a distemper, yet the knowledge of it set me very much at ease, by satisfying me that my former coldness proceeded not from any defect of temper or genius, but from a disease to which any one may be subject I believe it is a certain fact, that most of the philosophers who have gone before us have been overthrown by the greatness of their genius, and that little more is required to make a man succeed in this study, than to throw off all prejudices either for his own opinions or for those of others. At least this is all I have to depend on for the truth of my reasonings which I have multiplied to such a degree, that within these three years I find I have scribbled many a quire of paper in which there is nothing contained but my own inventions. This, with the reading most of the celebrated books in Latin, French, and English, and acquiring the Italian, you may think a sufficient business for one in perfect health, and so it would, had it been done to any purpose • but my disease was a cruel encumbrance on me. I found that I was not able to follow out any train of thought by one continued stretch oi view, but by repeated interruptions, and by refreshing my eye from time to time upon other objects. . . . • I have noticed in the writings of the French mystics, and in those of our fanatics here, that when they give a history of the situation of their souls they mention a coldness and desertion of the spirit which frequently returns; and some of them at the beginning have been tormented with ^ it many years As this kind of devotion depends entirely on the force of passion, and consequently of the animal spirits, I have often tnought that their case and mine were pretty parallel, and that their rapturous admirations might discompose the fabric of the nerves and brain, as much as profound reflections, and that warmth or enthusiasm which is inseparable from them. However this may be, I have not come out of the cloud so well as they commonly tell us they have done, or rather begin to despair of ever recovering. The questions I would humbly propose to you are : Whether, among all those scholars you have been acquainted with, you have ever known any affected in this manner? Whether I can ever hope for a recovery ? Whether I must long wait for it ? Whether my recovery will ever be perfect, and my spirits regain their former spring and vigour, so as to endure the fatigue of deep and abstruse thinking ?” (Burton, vol i., p. 31-38.) € H U M E. Hume, quiesced, in after life, in his first early conclusions—the very David, immaturity of which might well have awakened suspicion. There is no proof that, when he became a man in intellect, he ever seriously revolved them again. He must also be blamed for the resolute way in which he evaded or silenced every attempt to turn his mind to the reconsideration of his opinions. A remarkable instance of this disposition to get rid of expostulation occurs in one of his letters to Blair, cited by Mr Burton :—“ Whenever,” says Hume, “ I have had the pleasure to be in your company, if the discourse turned on any common subject of literature or reasoning, I always parted from you both entertained and instructed. But, when the conversation was diverted by you from this channel towards the subject of your profession—though I doubt not but your intentions were friendly towards me—I own I never received the same satisfaction : I was apt to be tired, and you to be angry. I would therefore wish, for the future, whenever my good fortune throws me in your way, that these topics should be forborne between us. I have long since done with all inquiries on such subjects, and am become incapable of receiving instruction? Blair’s letter, by the way, shows that Hume’s Scottish clerical admirers did not hesitate to embrace opportunities of faithful expostulation as far as Hume’s repellent humour permitted, and proves how unjust and uncharitable the sus¬ picions which were sometimes founded on the intimacy be¬ tween him and them. A man’s Christianity would be equivocally evinced by renouncing all intercourse with such as renounce it; such conduct would suggest to those thus re¬ pelled a strange idea of the charity which professed to seek their spiritual welfare ! It were rather to be desired that every Hume or Gibbon might have for his bosom friend a Bishop Butler or a Robert Hall. Of the personal and social elements of Hume’s character it is unnecessary to say anything, as the subject has been so admirably touched by Sir James Mackintosh, in his pre¬ liminary Dissertation. That he was very amiable, and well merited the admiration of his friends, cannot be doubted; though the eulogy of Adam Smith, uttered in the first freshness of grief at his loss is, as Sir James observes, “ an affectionate exaggeration.” “ Such a praise,” he justly says, “can never be earned without passing through either of the extremes of fortune, without standing the test of temptations, dangers, and sacrifices. It may be said, with truth, the private character of Mr Hume exhi¬ bited all the virtues which a man of reputable station, under a mild government, in the quiet times of a civilized country, has often the opportunity to practise.” In certain respects,. Hume presented rather a curious contrast. He was by no means the impassive person his general coldness of temperament would lead us to conclude, and by no means the unprejudiced person which a sceptical philosophy may be presumed to have a tendency to form, and which he would fain be thought. Where his solitary 7 passion—literary ambition—was in question, his vanity is as Hume, impatient, exacting, and querulous as that of any mortal; I)avld- in spite of constantly brightening prospects and widening v'—nt**' fame, he is perpetually harping about imaginary neglect and imaginary persecution. Similarly as to prejudice; his bitterness against the English1 will just match, and no more than match, with Johnson’s bitterness against the Scotch. In these two men, the two nations may justly con¬ sider themselves quits; and fortunately are never likely to have any more such absurd accounts to settle between them. It is the happiness of our age that Englishmen would as little tolerate the prejudices of Johnson as Scotchmen would thoseof Hume.—But it is in his historical writings that Hume’s intense capacity of prejudice appears most signally. He who was the most sceptical of philosophers became, in fact, the most bigoted of historians ; with this aggravation of his bigotry, however,—that all the acts and opinions of which, in his history, he was so keen an apologist, were in direct defiance of the general strain of his political senti¬ ments and speculations, as disclosed in his Political Essays. As to his character as a philosopher, his genius will pro¬ bably be more appreciated, and its achievements less va¬ lued, by successive generations of readers. His capacity cannot be well exaggerated. That such a work as the Treatise of Human Nature, or the Essays, should have pro¬ ceeded from so young a man, gives an impression of subtlety, acuteness, and ingenuity, seldom, if ever, surpassed. But these productions are chiefly remarkable as proofs of his genius, and for the searching investigations to which they led on the part of others ; not for their intrinsic value. Sys¬ tem, as both Stewart and Mackintosh observe, he had none ; he is constantly shifting his ground, and contradictions with¬ out number may be detected in his writings. The fact is, that provided he coidd find any arguments to support the paradox of scepticism which happened to be the theme of one essay, he did not care how it might be opposed to some other paradox of scepticism which was defended in another essay. Thus, while speculatively arguing that neither “ in¬ tuition,” “demonstration,” “experience,” nor any other con¬ ceivable reason, really authorizes us to conclude that any one sequence will follow any one antecedent rather than another, or that the future will resemble the past, he, in his Essay on Miracles, declares all “ miracles” utterly incredible,2 because they would contradict the uniformity of nature as ascertained by experience f3 ambitious to outdo Berkeleybyannihilating not only matter but mind, and reducing every thing in the universe to “ impressions and ideas,” he abundantly contra¬ dicts himself (but here, to be sure, he could not help it) by saying in the same breath, that of the existence of these “impressions and ideas” even scepticism cannot doubt, since we—that is, the doubted conscious unity, Mind—cannot but be conscious of them : similarly, while affirming, consis¬ tently enough in words all his lite long, his belief in an in¬ telligent First Cause (and it is the only determinate religious 1 Thus he speaks of the English in 1764, “ That nation are relapsing fast into the deepest stupidity and ignorance. The taste for literature is neither decayed nor depraved here as with the barbarians on the banks of the Thames. . . . Can you seriously talk of my continuing an Englishman ? Am I, or are you, an Englishman? Do they not treat with derision our pretensions to that name, and with hatred our just pretensions to surpass and govern them ? . . (1775) I have a reluctance to think of settling among the factious barbarians of London, who will hate me because I am a Scotsman, and am not a Whig, and despise me because 1 am a man of letters. . . (1776) It is lamentable to think how much that nation has declined in literature in our time.” 2 This inconsistency with his speculative principles is the least defect in that acute but sophistical performance. But its fallacies have been too often pointed out to need being mentioned here. 3 “ For all inferences from experience suppose, as their foundation, that the future will resemble the past, and that similar powers will be conjoined with similar sensible qualities. If there be any suspicion that the course of nature may change, and that the past may be no rule for the future, all experience becomes useless, and can give rise to no inference or conclusion. It is impossible, there¬ fore, that any arguments from experience can prove this resemblance of the past to the future ; since all these arguments are founded on the supposition of that resemblance. Let the course of things be allowed hitherto ever so regular, that alone, without some new argument or inference, proves not that for the future it will continue so. In vain do you pretend to have learned the nature of bodies from your past experience” {Essays, vol. ii., Sceptical Boults'). “ A wise man, therefore, proportions his belief to the evidence. In such conclusions as are founded on an infallible experience, he expects the event with the last degree of assurance, and regards his past ex¬ perience as a full proof of the future existence of that event” (Essays, vol. ii., Miracles). 8 HU Hume, tenet which he seems to have maintained), nearly all his David, speculative reasonings—especially his theory of causation —tend to show that of that primal truth there cannot be satisfactory proof, and he has even furnished atheism with a novel paradox in its support, founded on the world’s be¬ ing a “ singular effectindignantly repelling, as a per¬ version of his meaning, the notion that he “ had ever as¬ serted so absurd a proposition as that any thing might arise without a cause,” he has yet so expressed himself, that (as has been well said by one of his most acute critics) the entire metaphysical world has shared in the mistake! Magnani¬ mously declaring at one time that the philosopher must abide by truth, even though it were proved pernicious to mankind,—quite in the \ofty fiatjustitia mat ccelum style,— he, at another, advises (and it is a deep blot on his character) a sceptical friend to accept church preferment, and preach what he did not believe ; affirming that “ to pique oneself on sincerity in such matters is to put too great a respect on the vulgar and their superstitions !” Well may one of his most charitable critics proclaim himself “ ashamed to print” the philosopher’s words ! Again, while in his Essay on Poly¬ gamy and Divorce he sees so clearly and illustrates so well the infinite importance of preserving the domestic relations pure, he speaks, in his Inquiry into the Principles of Morals, in an apologetic tone of vices which, if freely indulged, would soon dissolve society—an inconsistency which has called forth the just animadversion of Sir James Mackintosh. In a word, there is no end to the incoherencies of Hume’s statements, and which are only concealed so long as one essay is not collated with another. He wrote, as it were, with the old Roman stylus—a sharp pen at one end, and an instrument of erasure at the other. His fame as a philosopher, therefore, will rest rather on what he was capable of than on what he achieved ; and it may be said, by a somewhat similar paradox, that his fame as an historian will rest much more on his manner than on his matter. His work is everywhere disfigured with gross defects, inaccuracies, and prejudices, as Hallam, Bro- die, and many others, have abundantly shown ; but the charm of his style embalms and perfumes his errors, and men will still be willing to read him—though they disbelieve. Not, indeed, that even his style as an historian is wholly free from defects. It is cold—that might be expected from the frigid temperament of the man. It is wanting in imagi¬ nativeness, and consequently in animation, and the perfection of graphic skill. This fault again is often aggravated by superficial knowledge of his materials ; for a full mastery of details is the only thing which can render precise state¬ ment safe. Thus Hume often omits names and dates where they ought to be inserted, and conceals the neces¬ sity of definite statement in convenient vagueness. His assertions are often so general and so adroitly balanced and qualified, that they seem to betray a consciousness that he is standing on delicate ground, and that he had better not commit himself to too much exactness, lest some critic of greater knowledge of details should convict him of inaccu¬ racy. These artifices he employs no doubt with great dex¬ terity, but one would greatly have preferred that there should have been no occasion for them. Still, in spite of all these deductions, the narrative is so lucid, the grouping M E. so admirable, the reflections so unforced and natural, and Hume, the style flows on in such a stream of tranquil beauty— Joseph, combining so much both of flexile grace and natural dignity, that his work will ever stand high in the estimate of every cultivated taste. It is an instance of the importance of style, as Sir J. Mackintosh remarked of Butler. That pro¬ found thinker has been often undervalued for want of a style worthy of his thoughts: the work of Hume, in spite of its defects, has been raised into one of the most familiar manuals of history, because it has one. So senseless is that cry which one sometimes hears—that style is of little consequence, if facts be but stated ! When was human nature ever got to disregard the medium and the manner in which truth was presented ? So little is this to be expected, that though Hume’s inaccuracies have been exposed a thousand times, he still maintains, in virtue of his style alone, the place of a classic of English history. The same qualities of style are, if possible, more manifest in Hume’s Philosophical Essays. Amidst that absence of all generous enthusiasm which we should expect in so com¬ plete a Pyrrhonist, and a prodigal use of subtle and inge¬ nious sophistry that would seem to have had no other object than to confound and perplex the intellect of the reader, they abound in passages which, considered simply as composition, are exquisite specimens of refined simplicity —of that severe Attic grace which it is evident he had care¬ fully studied and cultivated, as well as of a very quiet but most elegant pleasantry. And amongst such passages few are more striking than those in which the sceptic acknow¬ ledges the vanity of scepticism.1 The fullest and most authentic account of Hume’s Life and Writings will be found in Burton’s recent Life, 2 vols. 8vo, Edin. 1846; to which we willingly confess our obli¬ gations. (h. k.) Hume, Joseph, an eminent political reformer of the nine¬ teenth century, was born in 1777, of humble parents in Mon¬ trose. After such an education as the grammar school of his native place then afforded, he was apprenticed to a surgeon, and in 1793 began a course of medical study at the Univer¬ sity of Edinburgh. After graduation he sailed for India, where he was attached as surgeon to a regiment; and his knowledge of the native tongues (which he took care to mas¬ ter immediately on landing), and his capacity for business, threw open to him the lucrative offices of interpreter and commissary-general. While still in the prime of life he was enabled to return home with a well-earned fortune. His first care on arriving in England was to study thoroughly the country and its resources, and in the various journeys which he made to see with his own eyes the actual state of the people and the practical operation of the laws, he amassed that stock of useful knowledge which was the real secret of his subsequent success in parliament. In 1812 he took his seat for the borough of Weymouth and Melcomb Regis, but was soon after obliged to resign it, when it was discovered by his Tory patron that he had had the audacity to talk of re¬ form. Six years elapsed before he again entered the House, and during that interval he had made the acquaintance and imbibed the doctrines of James Mill and the philosophical reformers of the school of Bentham. In 1819, soon after his marriage, he re-entered parliament, and began unaided Nothing can be happier than the pleasantry in some of Hume’s familiar letters, and it makes us regret that we have not more of them. "We would willingly exchange for them portions either of his Essays or his History, bulk for bulk. Light and trivial in com¬ parison no doubt they would be, but one might find consolation in thinking that elegant triviality was at least as good as grave error or pernicious paradox. How graceful is the following badinage',—I live still, and must for a twelvemonth, in my old house in St James’s Court, which is very cheerful, and even elegant, but too small to display my great talent for cookery—the science to which I intend to addict the remaining years of my life ! I have just now lying on the table before me a receipt for making sowpe d la reine, copied with my own hand. Tor beef and cabbage (a charming dish), and old mutton, and old claret, nobody excels me. I make also sheep’s- head broth, in a manner that Mr Keith speaks of it for eight days after ; and the Due de Nivernois would bind himself apprentice to my lass to learn it! I have already sent a challenge to David Moncrief; you wdll see that in a twelvemonth he will take to the writing of history (the field I have deserted), for, as to giving of dinners, he can now have no further pretensions. I should have made a very bad use of my abode in Paris, if I could not get the better of a mere provincial like him.” H U N II U N 9 Humerpoor and alone that career of reform in which he persevered to his || death. Free-trade, financial reform, parliamentary reform, Hungary. and Indian reform, were the elements in which he lived. At first despised and ridiculed, afterwards dreaded as the justum et tenacem propositi virum, he ended by gaining the respect of friends and foes, and the confidence of the whole nation. It was not by the force of a commanding intellect or the fascinations of a brilliant oratory that he achieved this end. The breadth of his action, his singleness of aim, his perfect independence of all party or personal considera¬ tions, and an almost heroic earnestness and self-denial in carrying out his views, were the secrets of his influence. Himself as incorruptible as Aristides, he made it a special duty to hunt out and expose political corruption under what¬ ever guise it lurked, and the whole army of place-hunters and jobbers found in him their most indefatigable and in¬ exorable foe. There were many abler, but there was no more useful member in the House during the greater por¬ tion of his parliamentary career. His death, which took place Feb. 20, 1855, was regretted by his countrymen as a national loss. HUMERPOOIl, a considerable town of Hindustan, situate on the right bank of the Jumna, at a spot where the river has a stream running in a channel half a mile in breadth with a rapidity of three or four miles an hour. The district of which this town is the chief place, has an area of 2240 square miles, with a population of 452,091, of whom 419,683 are Hindus, and the remainder Mohammedans. The town is situate 110 miles N.W. of Allahabad, in Lat. 25.58., Long. 80. 14. HUMILIATI, a monastic order founded in 1134 by several Italian noblemen who had been sent as prisoners to Germany by Lothar II., and w'ere released on account of their humility. In 1151 they were embraced under the rule of St Benedict, and the order was confirmed by Inno¬ cent III. half a century later. They ultimately spread so widely as to have 98 houses under the jurisdiction of their order; but they were suppressed by Pius V. in 1576 on account of their luxury and cruelty. A female order insti¬ tuted by the ladies of the original Humiliati have still some representatives in Italy. PIUMPHREY, Laurence, a learned English divine, was born at Newport-Pagnell, Buckinghamshire, about the year 1527. He received his school education at Cambridge, and afterwards became a fellow of Magdalen College, Ox¬ ford, where he took his degree as master of arts in 1552. In 1555 he retired, with other Protestant refugees, to Zu- Hundred II Hungary. rich, in Switzerland, where he resided tor some time; but after the death of Queen Mary he* returned to England, where he was restored to his fellowship in Magdalen Col¬ lege, from which he had been expelled, and in 1560 ap¬ pointed queen’s professor of divinity at Oxford. In 1570 lie was made dean of Gloucester ; in 1580 he was removed to the deanery of Winchester; and, if he had not been disaffected towards the Church of England, in other words, a moderate and conscientious Nonconformist, he would pro¬ bably have been raised to the episcopal bench. Humphrey was considered as a great and general scholar, an able lin¬ guist, a profound theologian, and, for his time, an excellent writer. He died early in 1590, leaving a wife who had brought him twelve children. His works are, Epistola de Greeds Uteris, et Homeri lectione et imitatione, Basil, 1558 ; De Religionis conservatione et reformatione, deque primatu Regum, Basil, 1559; De Ratione interpretandi auctores, Basil, 1559 ; Optimates, sive de Nohilitate, ejusque antiqua origine, Basil, 1560; Joannis Juelli Angli, Episcopi Sa- risburiensis, Vita et Mors, London, 1573 ; two Latin Ora¬ tions spoken before Queen Elizabeth, one in 1572, and the other in 1575; Sermons; and some Latin pieces against the Papists, particularly Campian. HUNDRED, Hundredum, or Centuria, a part or di¬ vision of a county, and anciently so called from its contain¬ ing a hundred families, though the term was also applied to much larger county-divisions, as to the wapentakes of the northern counties. The jurisdiction of the hundred was vested in a sheriff, and he or his deputy held both a court- baron and a court-leet; sometimes this jurisdiction was by special crown grant vested in private persons. When da¬ mage was done within their district, the hundred were re¬ sponsible unless they produced the felon. Sub-divisions of shires have existed since the time of Alfred, and hundreds are mentioned in records of still earlier date. H U N G A R Y. Geography. The kingdom of Hungary consists of Hungary Proper, Scla- vonia, Croatia, Hungarian Dalmatia on the sea coast, Transyl¬ vania, and the Military Frontier. It is situated between 46° and 50° N. Lat., and between 15° and 25° E. Long. It is bounded on the N. by Galicia, on the E. by the Danubian Principalities, on the S. by Servia, Bosnia, and the Adriatic, and on the W. by Styria, Lower Austria, Moravia, and Silesia. The north-eastern frontiers are formed by the Carpathians, which jut out m dif¬ ferent branches towards the banks of the Danube, and inclose Transylvania in the form of a double crescent. A no less na¬ tural boundary is the Danube, separating Southern Hungary from the Turkish Provinces. The least marked frontier is the western, separating Hungary from Lower Austria : it is in part formed by the small March River. The exact extent of Hungary and its dependencies has not yet been precisely ascertained. According to the Austrian official statistics published by Czornig, the superficial area amounts to 125,037 English square miles ; more recent Aus¬ trian tables reduce that number, -whereas the Hungarian sta¬ tist, Alexius Fenyes, reckons the superficial area at 130,910 English square miles, of which Transylvania occupies about one-sixth, or upwards of 20,000 miles. The Hungarian king¬ dom is thus larger than Great Britain and Ireland by about 10,000, and than Prussia by 20,000 square miles. The physical aspect of Hungary Proper is sharply marked by the contrast between the northern Carpathians, forming large plateaus, and the vast level land intersected by the Danube, Theiss, and Marosh ; while in Transylvania,. where the Alpine character predominates, the sudden diminution VOL. XII. of the mountains allows only of undulating table-land, alter¬ nating with narrow valleys. The greatest part of Croatia, and part of Sclavonia, likewise consists of mountainous land, formed by the outliers of the Alps, the level land in the latter lying to the north. M . Rising like a rampart between Hungary, and Moravia,M0UntainSi Silesia, Galicia, and the Bukowina, the Carpathians, after running round Transylvania, extend to Orsova on the Danube. They form no connected chain, and are generally divided into frontier and central mountains. The frontier Carpathians, which are of less height than the latter, begin at Presburg. One group of these extends between the rivers Waag and March, and afterwards enters Moravia at the Strang Pass. The other group, known by the name of Beskid, runs between Hungary and Silesia, Galicia, and the Bukowina, and after traversing Moldavia appears as the frontier mountain of Tran¬ sylvania. The inner or central Carpathians, which occupy much less ground than the frontier ones, are also divided into dif¬ ferent chains or groups, among which the Tatra group in the north forms the most imposing mass. The whole granite pla¬ teau of this group is about 5l) miles long and 15 miles broad. Its highest crests are the Lomnitzer, 8370, the Eisthaler, 8320, °and the Ivrivan, 8230 feet high. The south-western branch of the Tatra extends to the mineral mountains. These, like a few other groups, are classified with the midland moun¬ tains, which are considered distinct from the central Carpa¬ thians. The Matza group in the county of Heves, the Buk, and Vine hills, where the tokay grows, are comprised in the northern chain. The eastern chain begins from the banks of B 10 H U N G A B Y. Rivers. Hungary, the Bodrog, and extends over the greater part of Transyl- vania. The western branches of this chain pass into southern Hungary or the Banat, and then gradually sink into hills. As in Transylvania the highest chain is the southern er Fagaros mountain range, rising near Cronstadt, the summit of which measures 8515 feet high. The low western mountains of Hun¬ gary which come from Croatia and Sclavonia belong to the Styrian and Julian Alps, and are connected with the Carpa¬ thians by the midland mountains. The great Hungarian plain, which is the largest in Europe, begins at the Matra group in the north, and extending over Southern Hungary, ends at the confluence of the Save and the Danube at Semlin. It is through this plain, called the Eastern Plain, presenting the richest soil, alternating with large barren sandy wastes, and which is hardly 140 feet above the level of the sea, that the Theiss pursues her meandering course towards the Danube. This plain is quite treeless and affords nothing to vary the monotonous scene except the mirage or Fata-Morgana (in Hungarian deli-bab). The smaller or western plain is sepa¬ rated from the former by the Bakonywood and its branches. The frontier Carpathians consist mostly of sandstone forma¬ tions, while the central or primitive mountains are of a granitic character, and contain strata of gneiss or beds of quartz, clay- slate, grauwacke, basalt, and diorite. The calcareous formations are particularly rich in iron and copper, whereas the porphy- ritic and granite rocks contain much gold and silver. The sandstone and other secondary strata abound in coal beds. The level land, rich in salt springs, is also impregnated with nitre and carbonate of soda. Turning to the hydrographic survey of the country, the Danube, the largest European river next to the Volga, first claims notice. Reaching the Hungarian territory at Presburg where the Carpathians begin to rise on its left bank, the Danube pursues a south-easterly course, dividing into three branches which receive the waters of the Layta, Raab, and the Waag, embracing moreover the two Schiitt islands about Comorn, and then the St Andrew Island at Waitzen, after which its direc¬ tion becomes more southerly, and after leaving Buda and the Osepel Island it rolls along the Hungarian plain and the Banat; its right banks reaching the Turkish territory at Semlin. There, where its course becomes retarded by the Servian mountains, it receives the waters of the Save, leav¬ ing the kingdom at Orsova, after forcing its impetuous waves through the Iron Gate. The breadth of the Danube varies in different parts, being about Presburg 900 feet, at Foldvar 1800 feet, between the former and Vanek4000 feet, at Petervardein 3500 feet, at Belgrade508 feet, and at the Iron Gate betweenl58 and 80 feet. The depth varies between 20, 40, 60, and 120 feet. The greatest tributary of the Danube, the Theiss (Tibiscum), rises from a double source in the county of Marmaros near Ga¬ licia, reaches the level land at Nagy Szoles, and winds its course through the large plain as far as Titel, where it flows into the bed of the Danube. The chief tributaries of the Theiss, re¬ markable for richness in fish, are the Hernad, Sajo, Bodrog, Szamos, Koros, and the Marosh, which is the chief river in Transylvania. The Drave, which rises in the Tyrol, flows through Styria into Croatia, and dividing it from Hungary, falls into the Danube near Essek. The Save, rising in Carinola, winds its course through Croatia, is fed by the Unna and Kulpa, forms part of the frontier towards Bosnia and Servia, and falls into the Danube at Belgrade. The Marosh, which ranks next to the Theiss, falls into the latter at Szegedin, after having re¬ ceived the Aranyos, famous for its gold washings, and the Kokel or Kukiilo. The Alt or Aluta rises likewise in the Transylvanian mountains, entering Wallachia through the Red-Tower Pass. All the Hungarian rivers flow into the Black Sea, with the exception of the Popard, which rises in the Zips from the Kongsberg, and flows into the Vistula. Among the lakes the largest is the Flatten see or Balaton, situated between the counties of Zala and Schumeg. Its length is about 50 miles and its breadth between 8 and 9 miles ; and with the surrounding marshes, it occupies above 500 square miles. Its principal feeder is the Zala, and its only outlet is the marsh Sio. The Neusiedler-see in Hungarian Ferto, be¬ tween the counties of Wieselburg and Oedenburg, fed by the Vulka, is 70 miles long and 10 miles broad ; its shallow waters are impregnated with salt, and exhibit an ebb and flow, as yet unexplained. The Palver-see is, properly speaking, a marsh Lakes resembling many which are formed by the Theiss and Lower Hungary. Danube. TheSar-ret in Bihar, the Ecseder in Szathmar, the v ^ i Feketels in the Banat, are the largest marshes, The marshes covered with aquatic plants, such as Ecseder, are generally distinguished by the name of laip. The only canal of importance is that in the county of Bacs, called the Francis Canal, cut from Monoster to Foldvar, and uniting the Danube with the Theiss. It is about sixty miles long, and shortens the passage by about 200 miles. The Bega Canal, near Temesvar, is rather a river than a canal. The Adriatic touches only the south-western extremity of the Hungarian kingdom, the sea-coast being variously called Hungarian Dalmatia or Illyria, the principal ports being Fiume, a flourishing town inhabited chiefly by Italians, Buc- cari, Porte-re-Zengg, St George, Tablonz, and Carlopago. The whole coast is mountainous, and in some parts steep, and exposed to violent south winds. As regards natural curiosities the numerous ossiferous Caverns, caverns, amid the northern limestone mountains, deserve par¬ ticular mention. The Agtelek Cave in Gomor, 16 feet high and about 50 feet broad, extending in a straight line to about 900 feet, contains fossil bones of the elephant, rhinoceros, and other large animals. Apertures in its sides open into recesses communicating with each other, and these as well as the main body of the cave contain springs. Of a simi¬ lar description is the cave of Domeny-falva in Liptau, con¬ taining glacial masses, and not far distant from it is the Okno and Vadi. The Czerva or Black Cave exhibits colum¬ nar concretions, and the same formations are found in the deep F unatta Cave in Bihar, which is divided into five separate fis¬ sures or chambers filled with ossiferous fossils. In the Banat is the Veterani Cavern near the Danube, containing a cistern and a powder magazine, once forming an important military post. The most remarkable, however, is perhaps the Almas Cavern in the Szekler district of Transylvania. This spacious cavern presents, besides a labyrinth of precipices and chasms, marshes with floating beds or aquatic plants, and a rushing brook. No less curious is a small turbid stream near the Tatra group, looked upon by the people as a blood-sucker. As may be inferred from its geographical position, Hungary contains the usual European quadrupeds, and its soil is pro¬ ductive of great varieties of vegetable life. It may be added that the Carpathians harbour the wolf, the bear, and cha¬ mois ; and that if Hungary is not the land where the citron grows, it is superior to Italy in vines, and to all Europe in its exquisite melons. Fiired, near the Balatan Lake, and Bartfeld, ■ on the Galician frontier, watering-places much frequented in the summer season, have chalybeate springs, while Teplitz in Trenchin, and Mehadia in the Banat, have sulphurous springs. Parad in Borsad, and Borszek in Transylvania, have acidulous wells. No less famed are the hot springs of Buda. The climate of Hungary varies greatly. In the counties of Climate. Arva, Liptau, Zips, and Marmaros, winter continues for fully six months, whereas in Southern Hungary the trees blossom as early as March, and in June the heat becomes burdensome, reaching its culminating point in July. From the partial meteorological observations that have been made, it appears that the highest temperature in Buda is 30O-6 R., and in Klau- senburg (in Transylvania) 320,6; and the mean is, in Buda 150,19, and in Klausenburg 53°. This, however, is far from giving an idea of the climate in the different parts of the coun¬ try, and especially in the level land in the south, or the larger plain, where at mid-day the heat is at times almost African ; and yet in those very parts, as a geographer observes, even quicksilver was frozen in the unusually severe winter of 1816. The heat of the smaller or western plain is much tempered by the Bakonywood. The first half of January marks the mini¬ mum, and the second half of July the maximum of the tem¬ perature ; whilst April and the first part of October coincide with the mean temperature. Blasts and the falling of hail hap¬ pen most frequently among the Carpathians. The population of Hungary and its dependencies contains a Races, great variety of races, some of which form but insignificant numbers ; the four principal races are the Magyars, the con¬ querors and founders of the kingdom, the Sclavonians, the Wallachians, and the Germans. The ancient home of the Magyars or Ugri is Central Asia or ancient Scythia. Pressed by other tribes, they moved gradually round the Caspian Sea and the Euxine, till, at the end of the ninth century, they HUNGARY. 11 reached the Carpathians. Their leader Almus and his son Arpad, as the chroniclers say, in advancing to these mountains, burned to find out the fertile land of Attila, the king of the Huns, upon whom they looked as their ancestor. Hence, per¬ haps, may be explained the origin of the word Hungary and Hungarians, though some wish to derive that name from the term Ugari applied to the Magyars by the Sclaves. The Mag¬ yar population comprises several tribes distinguished as the Szekler, the Cumans, and the Jasiges. The Szekler, or Siculi, were the followers of Attila. After the dismemberment of the Hunnish empire, in the 6th century, they retreated to the eastern mountains of Transylvania, where they continued to live till the arrival of their kindred. The Cumans and Jasiges, on the other hand, repeatedly entered Hungary during the 12th and 13th centuries in the character of invaders, till at length they settled as friends. The entire Magyar population speaks the same language with some ditferences in pronunciation, and some provincialisms, as is the case in England, France, and almost every country. The Sclavonic population consists of several branches, speaking different dialects, the chief of which are the Slovaks, Ruthens or Russniaks, Rascians or Serbs (in German Raitzen), and Croats, the insignificant tribe of the Bulgarians, the Wends, Schokutz, and Montenegrins. The Slovaks and Russniaks belong to the northern Sclavonic stock, wThich comprises the Poles and the Czeches of Bohemia, while the Rascians and Croats belong to the southern Sclavonic family, the greater portion of which inhabits Turkey. All these Sclavonic races, with the exception of the Rascians, inhabited Hungary before the arrival of the Magyars. The Rascians came from Turkey about the year 1690, at the time of the vic¬ tories of Eugene over the Ottomans The German settlers called Saxons came to Hungary first, in the year 1143, having been invited by King Geysa II., by whom they were endowed with privileges and lands in Transylvania, and in more recent times, during the reign of Maria Theresa and Joseph I., though there were, no doubt, small numbers of them in Hungary pre¬ vious to the Magyar conquest. The Wallachians or Roumins, who greatly resemble the Italians in physiognomy and lan¬ guage, were formerly known by the name of Petshengers, the inhabitants of Dacia, of which Transylvania formed a part. In the times of the Roman emperor Trajan, they became inter¬ mixed with the Roman colonists located beside the Danube, and hence their present language. The whole population of Hungary may thus be divided into four distinct races; the Eastern, comprising,—besides the Magyars, Jews, Armenians, and that most singular people, the Gypsies,—the Sclavonian, the Wallachian, and the Teutonic race. At the end of the great war in the beginning of the present century, the population of Hungary, Transylvania included, was 12,000,000, and, according to the last census, before the late war of 1848, it amounted to about 14,500,000. Of this num¬ ber, 2,200,000, belong to Transylvania, and 490,267 to Croatia; the population of the military frontier being estimated at more than 1,000,000. With regard to the different races, the pro¬ portion is as follows :— Magyars 5,418,773 Slovaks 1,722,003 Ilascians 1,293,995 Croats 943,995 Rusniaks 459,870 Wallachians 2,686,492 Germans 1,273,677 Jews Wends Bulgarians. French MINOR NATIONALITIES. 244,000 40,000 12,000 6,000 Greeks Armenians Montenegrins. Clementines... 5,000 3,000 2,000 1,600 The number of the Gypsies is variously estimated at 40,000 and 60,000. The different confessions are represented in the following approximate numbers:— Roman Catholics 6,500,000 Greek Catholics 890,000 Non-United Greeks...1,800,000 Calvinists 1,700,000 Lutherans 829,000 IN TRANSYLVANIA. Roman Catholics 221,400 Greek Catholics 605,300 Non-United Greeks 725,700 Calvinists 358,300 Lutherans 220,400 Unitarians 44,600 With regard to the relation of the races to the confessions, Hungary, it may be observed that the Calvinists consist chiefly of the i Magyars; the Lutherans, of the Slovaks and Germans; the orthodox and united Greeks, of the Rascians and Wallachs ; the Roman Catholics, of about half of the Magyars and the rest of the Slavonic population and Germans. The town population is estimated to form one-eighth of the inhabitants, a circumstance sufficiently proving the backward state of the country. The total number of towns in Hungary and Transylvania is 146 ; of boroughs, 881; and of villages, 16,450. The character of the races is as different as their origin. The Magyars, both nobles and peasants, are marked by their Oriental pride and nobleness; by their love of liberty, hospi¬ table customs, conviviality, and warlike spirit. Clinging with filial love to his superiors, the peasant—a gentleman in lan¬ guage and bearing—is, at the same time, alive to the sense of his own worth. In field labour and horsemanship, the Mag¬ yars surpass all the rest. The Sclavonians of North-western Hungary are mild, frugal, and industrious. The southern Sclavonians or Raitzen are, in character, very much like the Greeks, being, moreover, merry, warlike, and of a fierce dis¬ position. The Croats partake more of the character of the Raitzen, than of that of the north-western Sclavonians; and as to the Germans, they preserve their usual traits of industry and peaceableness. The most neglected race is, perhaps, the Wallachians. Strongly resembling in physiognomy the Ita¬ lians, a fact clearly verifying their intermixture with the Romans, they, like the Sclavonians, are bony, and of a tall stature, and are considered as one of the least active races. The population in the principal towns and boroughs was in 1851 as follows :— Pesth 106,379 Buda (united to Pesth by a suspension bridge)... 50,127 Debreczin 60,906 Presburg 42,178 Szegedin 50,244 Vasarhely 33,090 Kecskemet 32,308 Kronstadt (Transylvania) 24,401 Csoba 23,049 Mako 22,611 Temeswar 21,381 Grosswardein 21,221 Arad 19,564 Klausenburg (in Tran¬ sylvania) 19,346 Komorn 19,113 The relation in which the different classes of the population stand to each other will be noticed hereafter in connection with the constitution at large. The history of Hungary begins with the conquest of the Hist0I7- Magyars, who united ancient Pannonia, Croatia, Sclavonia, and Transylvania into one kingdom. Previous to their arrival these countries were ruled over by petty princes, and inhabited chiefly by Sclavonians, Bulgarians, Wallachs or Roumins, and a few Germans, all of whom soon submitted to their new conquerors. The prevailing opinion assumes the Magyars to be the descendants of the ancient Scythians, and to belong to the Tartar-Mogulian stock; the ingenuity of antiquarians, however, has not been remiss in bringing up evidences of their relationship to the Parthians, Turks, and Finns. Some go even so far as to trace the pedigree of the Magyars to Japhet, confounding the word Magyarok (the plural of Magyar) with Magog. The Magyars are said to have wandered from the Ural Mountains to the Caspian Sea, and thence to Kiov possessed by the Russians, who succeeded in getting rid of their new masters by representing to them the fertility and beauty of Pannonia, the land of Attila. Divided into seven tribes, they arrived at the frontiers of Hungary in the year 889, under the leadership of Almus. At this juncture Almus died, and the chiefs of the tribes elected his son Arpad successor. From the foot of the Carpathians the followers of Arpad rapidly spread along the plains of the Theiss, crossing the Danube and occupying the banks of the Drave. From the date of the con¬ quest to the year 1000, Hungary was ruled by dukes, royalty having been introduced simultaneously with Christianity a year afterwards. The following is a chronological table of the Arpad dynasty which ruled over Hungary for upwards of three centuries:— DUKES. Arpad the Conqueror. I Taksony. Zoltan. | Geysa. KINGS. HUNGARY. Years. Stephan (St) 1000 -1038 Aba and Peter (counter kings) 1038-1047 Andrew 1 1047-1061 Bela I. 1061-1063 Solomon 1063-1074 Geysa 1 1075-1077 Ladislaus I. 1077-1095 Coloman 1095-1114 Stephan II 1114-1131 Bela II 1131-1141 Years. Geysa II 1141-1161 Stephan III... 1161—1174 Bela III 1174-1196 Ladislaus II. (counter king) Emeric 1196-1204 Andrew II 1205-1235 Bela IV 1235-1270 Stephan IV 1270-1272 Laudislaus III 1272-1290 Andrew III 1290-1301 The following were the princes of the Houses that ruled Hungary from the extinction of the native dynasty to the commencement of the Hapsburg period :— Years. Charles Robert (Anjou) 1308-1342 Louis I. (Anjou) 1342-1382 Maria & Sigismund...1382-1437 Albert of Austria 1438-1439 Elizabeth 1438-1442 Uladislaus 1442-1444 Years. John Hunyadi (Gu- hernator) 1446-1452 Ladislaus Posthumus 1452-1457 Matthias Hunyadi or Corvinus 1458-1490 Uladislaus II 1490-1516 Louis 1516-1526 The first century spent by the Magyars in Europe, then in its most enervated condition, was chiefly marked by their predatory expeditions. The shores of the Baltic, France, and Italy, all experienced the devastations of these swift horsemen, formidable for their archery and irresistible prowess. They received a check at the hands of Otho the Great, who defeated them before the walls of Augsburg in 955. A gradual change to a more peaceful life commenced during the reign of Geysa, who prepared the way for the introduction of Christianity by entrusting the education of his son Vaik to Adalbert, Bishop of Prague. On succeeding his father, Vaik determined upon assuming the regal title, and applied to Pope Sylvester II. for his consecration and benediction. His petition was granted, and he was crowned under the name of Stephan. It is to this first king that Hungary owed most of those institutions which survived down to the year 1848. Besides giving the country an ecclesiastical organization, Stephan divided it into counties, and laid the foundation of its municipal institutions. He also created a national council, consisting of the lords temporal and spiritual, and the milites or middle class nobility, and from this the subsequent Diets took their shape. The most im¬ portant statutes enacted under his reign are contained in the Decrete of 1010. Stephan married Gisela, daughter of the emperor Henry II., an alliance which proved the source of much trouble after his death. Leaving no heir, as his only son Emeric preceded his father to the grave, the queen, assisted by the emperor, endeavoured to gain the throne for her cousin Peter, while Apa or Aba, an Arpadian prince, was proclaimed king by a part of the nobles. Both these princes having perished during the ivar, Andrew I. succeeded to the throne, but was soon compelled to yield it to his brother Bela I. Neither the reign of this king, nor that of his two immediate successors, offers anything worthy of remark. The reign of Ladislaus is remarkable in many respects. Besides repelling a Tartar invasion and vanquishing the Cumans, Ladislaus subdued Dalmatia and Croatia, and annexed them to the Hungarian kingdom (1078). Ladislaus was notorious for his religious zeal, which procured him the title of Saint. A ruler of much more talent was his successor Coloman, whose reign was contemporaneous with the first Crusades. But for the valour of this king, Hungary might have experienced the fate that befell the empire of the Palaeologi, and been parcelled out among the Godfreys and Baldwins. Coloman issued seve¬ ral edicts, chiefly concerning the discipline of the clergy; and carried on a successful war against Venice for the possession of Dalmatia. Coloman died in 1114, leaving the throne to his son Stephen II., whose reign, like that of all those of the twelfth century, is barren of interest. The reign of Andrew II., called the Hierosolomitan, is famous for those wars of the nobles with the crown, which resulted in the grant, by the king, of the Golden Bull, the Magna Charta of Hungary. The chief provisions of this charter were as follows :•—1st, That the states were henceforth to be annually convoked, either under the presidency of the king or the palatine; 2d, That no noble¬ man was to be arrested without being previously tried and legally sentenced; 3d, That no contribution or tax was to be levied on the property of the nobles; 4th, That if called to Hungary. military service beyond the frontiers of the country they were v ^ / to bo paid by the king ; 5th, That high offices should neither be made hereditary nor given to foreigners without the consent of the Diet. The most important point, however, was article 31st, which conferred on the nobles the right of appealing to arms in case of any violation of the laws by the crown. The other provisions contained in this charter refer to the exemption of the lower clergy from the payment of taxes and tolls, and to the determination of the tithes to be paid by the cultivators of the soil. This Golden Bull was sworn to by all the subsequent kings of Hungary, including the fourteen of the Hapsburg house, but the 31st article was cancelled on the accession of Joseph, son of the emperor Leopold. It was promulgated by Andrew in 1222, shortly after his arrival from the Holy Land. He was suc¬ ceeded by his son Bela IV., during whose reign Hungary was visited with the invasion of the Tartars under Batu Khan, who literally turned the country into a wilderness. The reigns of Stephan IV. and Ladislaus were chiefly marked by the wars waged against Ottoacer of Bohemia, who was engaged in hostilities with Rudolph, the founder of the House of Austria. With the assistance of Ladislaus, Rudolph defeated the Bo¬ hemian king at the battle of Lea in 1275. Amid fierce in¬ ternal dissensions, caused by the Cumans, Ladislaus died, and was succeeded by Andrew III., the last of the Arpads. This prince had to turn his arms against the emperor Albert, who, irritated at Andrew’s refusal to marry his daughter Agnes, had declared war against Hungary; and after defeating his adversary, ended by espousing the slighted Austrian princess. In 1301 Andrew died, leaving no issue, and there thus arose fresh and complicated wars. The first phases of Hungarian history are thus obviously parallel to the contemporaneous annals of other countries, marked by internal dissensions between the dominant elements of society, or the claimants to the throne, and by religious wars. In social institutions, Hungary undoubtedly stood above the other states of Europe; and the only peculiar disadvan¬ tage under which it laboured consisted in the diversity of its population, and the great power which the clerical order had acquired. After the death of Andrew III. three candidates aspired to the crown of St Stephan—Charles Anjou, nephew of Charles of Naples, and of Arpadian blood by his mother, who was daughter of Stephan IV.; Vencelaus, son of the king of Poland and Bohemia; and Otho, prince of Bavaria. Through the in¬ fluence of Pope Boniface VIII. and the bishops, Charles Anjou or Carobert was raised to the throne. Under the reign of this prince, and especially of his son, Hungary made great progress in general culture, and extended its influence abroad; and while the blessings of peace were felt at home, the Hungarian sword held in subjection Bulgaria, Bosnia, Servia, Moldavia, and Wallachia. To this vast power, Louis, surnamed the Great, the son of Charles, added the crown of Poland, so that under his reign Hungary was the most formidable state of Europe. But by a strange fatality so strongly discernible in the annals of this country, this grandeur suddenly vanished, in consequence of the extinction of the male Anjou line. From a reverence to her father, the States, contrary to the rule, resolved upon raising Mary, daughter of Louis, to the throne, and, with her, her consort Sigismund of Brandenburg, son of the emperor Charles IV.'—a determination pregnant with portentous events. It was soon after his succession to the throne that the Sultan Bajazet began to infest the provinces subject to the Hungarian crown, and to threaten Hungary Proper. After gaining some victories over the Turks, Sigismund was completely routed at Nicopolis (1395), and obliged to fly the kingdom. During his absence, a party, headed by the palatine Gara, raised the standard of rebellion, and took him prisoner after his return. Scarcely was he released when he met with troubles in another quarter; having found a rival in Wladislaus, king of Poland, who had married Hedvig, the second daughter of Louis the Great. The circumstance of his having pawned the sixteen towns of the north called the Zips occasioned fresh discontent, and made them transfer their alle¬ giance to his rival. After being elected Emperor of Germany and King of Bohemia, instead of providing for the safety of the country, Sigismund employed his time and resources in war¬ ring with the Hussites, and in presiding over the Council of H U N G A R Y. 13 Hungary. Constance'—satiating his impious zeal by condemning John i ^ j Huss and Jerome to the flames. The learned Sigismund ended his inglorious reign in 1437, leaving a daughter of the name of Elizabeth, married to Albert, archduke of Austria. After some misgivings the States proclaimed Albert king of Hungary, compelling him to confirm the privileges and rights of the country in a special manifesto resembling the Golden Bull. This Hapsburg king suddenly died, after a reign of three years. The States thereupon offered the crown to Wladislaus of Poland, and shortly afterwards the queen- dowager, the widow of Albert, was delivered of a son, called Ladislaus Posthumus. This was fresh cause for civil dissen¬ sion, and, to add to the evil, Amurath prepared for another general invasion. The party of Wladislaus having triumphed and secured his coronation, he turned his arms against the Turks, already masters of the Danubian Principalities ; and it was at this juncture that John Hunyadi, alias Corvinus, began to display those military talents which stamped him the first hero of the age. The origin of Hunyadi is shrouded in mystery. The pre¬ vailing opinion is, that he was of Wallachian extraction, and the son of George Hunyadi, vayvod of Wallachia during the reign of Sigismund. As to his surname Corvinus, some derive it from his estate, Piatra di Corvo; others, from his ancestry. Having been nominated vayvod of Transylvania by Wladislaus, John Hunyadi met Amurath on the plains ofWallachia, and routing his army, compelled the Sultan to retreat. The Sultan then overran Servia ; but here again the Janissaries were over¬ powered by the arm of brave Hunyadi. From Servia the Hun¬ garians advanced into Bulgaria, conquered Nissa, and gained a signal victory before the walls of Sophia (1443). These vic¬ tories inspired Pope Eugene IV. with the hopes of seeing the Turks chased from Europe ; and, to accomplish the great work ■without delay, he formed a league with the King of Hungary, the Emperor John Palaeologus, and the famous Scanderbeg, son of George Castriot, Prince of Epirus. The forces of these princes were, moreover, to be supported by a fleet, under the command of the Cardinal-Admiral Albert of Florence, destined to prevent the transportation of the Asiatic Turkish troops across the Hellespont. Apprised of these preparations, the Sultan sent ambassadors to the camp of Hunyadi with offers of peace; and, at the intercession of George, despot of Servia, peace was actually concluded for the term of ten years (1444). The Sultan, besides acknowledging the sovereignty of Hungary over Wallachia, bound himself to evacuate Bulgaria, and to restore all the Christian prisoners. The observance of the treaty, so advantageous and so needful to Hungary, was sworn to on the Gospel and the Koran. The Papal legate, Cardinal Julian, however, took care to have it turned into an immediate war. Besides representing the vast preparations made by the league, and the folly of losing the most favourable opportunity for entirely destroying the infidels (representations in them¬ selves sufficient to shake the youthful and ambitious Wladis¬ laus), the cardinal argued that the peace, inasmuch as it con¬ cerned all Christendom, and had been concluded without the consent of the Pope, was null and void ; and, moreover, that no obligations could bind Christians to keep faith with the in¬ fidels. The cardinal’s harangue produced the desired effect. Wladislaus bound himself by a solemn oath to begin the cru¬ sade the very same year. Hunyadi and Dracul, the vayvod of Wallachia, are said to have dissuaded the king from the expe¬ dition, but in vain. Despite the advanced state of the season, and the disband¬ ment of part of his Polish and Hungarian legions, Wladislaus took the field, and marched into Bulgaria towards Widdin. Here he awaited the Greek troops and Scanderbeg, as well as the arrival of the Italian fleet before Gallipoli. Abandoned by his allies, while, despite the fleet, Amurath safely landed his Janissaries at Gallipoli, Wladislaus determined upon a retrograde march, and encamped before Varna, which had been previously taken from the Turks. The rapid advance of Amurath having rendered farther retreat impossible, Cardinal Julian advised him to await the enemy within the walls of Varna; while Hunyadi, to whom the maintenance of a siege seemed impossible in consequence of the want of provisions and amunition, advised the acceptance of battle on the plain before the walls of the stronghold. The counsel of the vayvod pre¬ vailed. For three consecutive days and nights did the hostile forces combat each other without any decisive result. On the fourth day (the 10th November), Hunyadi, charging with his Hungary, horse, twice put to flight the Janissaries. On this assault, Amurath, chafing with rage and terror, turned his back to the followers of the Cross, but was stopped in his retreat by one of his subordinates seizing the bridle of his charger. Meamvhile, two of the Hungarian bishops, as well as the king himself, de¬ spising the orders of Hunyadi, whose undisputed laurels they envied, left their position and rashly pursued the flying enemy, a movement which turned the day in favour of the Crescent. Wladislaus paid the penalty of his rashness with sudden death, having been cut down by the sabres of the Janissaries ; and his death at once became the signal of panic and ruin to his army. Hunyadi alone, with a few followers, escaped the carnage. Cardinal Julian, the author of this perfidy, was also among the slain. The battle of Varna made the Sultan sole master of Servia and Wallachia, while the surrounding powers contrived to profit by the misfortunes of deceived Hungary. Venice at¬ tempted to conquer Dalmatia and Croatia; the Poles invaded Moldavia; the emperor Frederick III., the guardian of La¬ dislaus Posthumus, ravaged the provinces adjoining Austria. Frederick even refused to give up his ward to the Hungarians to be acknowledged king, and to hand over the crown of St Stephan, which had been left with him for safety. Amid these troubles the States proclaimed Hunyadi governor of Hungary. The first task of the governor was to wrest the young prince from the hands of the emperor by force of arms ; but the incur¬ sions of the Turks rendered this undertaking for a time im¬ possible. Pope Nicholaus, through his legate Cardinal St Angelo, repeated the promises of his predecessor ; but Hun¬ yadi was too sagacious implicitly to confide in the support of the Roman see. Having, with the aid of the Papal le¬ gate, concluded a truce of two years with Frederick III., he turned with all his energy against the Turks ; but his expecta¬ tions of victory were disappointed by the treachery of George, despot of Servia, who went over to the camp of the Mussul¬ mans. It was in consequence of this defection that Hunyadi lost, in 1450, the battle of Kossova (Campo Merulas), in which 8000 Hungarians and 34,000 Turks are said to have fallen. It need hardly be observed that the Papal promises proved an idle phantom. Pope Nicholas attempted to palliate his inac¬ tion on the ground that the Greeks, most concerned in the war, had refused to subscribe to the union-scheme prepared at the Congress of Ferrara. In 1452 the emperor at last agreed to release Ladislaus Posthumus, who was greeted by the general acclamations of the Hungarians. Hunyadi, having resigned his office of governor, was nominated generalissimo by the king. The terror that seized Europe after the capture of Constantinople by Moham¬ med II. seemed to convince both the Pope and emperor of the necessity of assisting Hungary; and while the former issued an indulgence to crusaders, the latter convoked the German States at Regensburg, where 10,000 horse and 32,0l!0 foot were voted against the common foe ; a number more numerous than Hun¬ yadi had expected. The Pope’s indulgences, however, wrere too cheaply estimated ; and the German levy did not go beyond the written resolutions. Exhausted Hungary was again left alone to fight the battles of Christendom. Slighting now his triumph over Bysanz, Mohammed set about preparing for the conquest of Hungary, and in 1456 he appeared before the walls of Belgrade with an army of 150,000 men. The garrison, under the command of Michael Orszag, numbered but a fewthousands; the Papal indulgences, promised to every one who should serve for six months, proved for the most part fruitless ; and, in addi¬ tion to this, the king, admonished by Hunyadi to make speedy preparations, fled in dismay to Vienna. The generalissimo, left to his own resources, raised a force of 10,000 troops at his own expense; and to these were added a few thousand men that fol¬ lowed the cross of John Capistran, a Mennonite monk. It was chiefly with these forces that Hunyadi hastened to the relief of Belgrade. It is not here the place to dwell on a defence on which the fate of Europe hung; it is enough briefly to state that, after a siege of several weeks, the haughty Ottoman conqueror, after leaving about 24,000 slain, saw, on August 4, 1456, his lines broken and his soldiers flying precipitately to Adrianople. Excessive fatigue brought on the hero, imme¬ diately after this victory, an illness from which he died at Semlin on the 10th of September. He left to his country two sons, Ladislaus and Matthias, the former of whom was cruelly 14 II U N G A R Y. Hungary, executed by tbe orders of King Ladislaus Postburaus, while the latter was destined to reach honours and fame higher even than those of his father. After the victory of Belgrade, the king returned from Vienna, and soon afterwards died at Prague. The subjugation of the Turks now became the common ground on which the rival princes built their hopes of the vacant throne. The three great rivals were the impotent Emperor Frederick, who held in his hands the crown of St Stephan ; Casmir of Saxony, brother- in-law to the late king; and the King of Poland. Each of these candidates found adherents among the reckless and corrupt oligarchs, but they became the especial support of the Hapsburg emperor. At the head of his party stood Dionisius, archbishop of Gran ; the palatine Gara, a sworn enemy to the Hunyadis; and Nicholas Ujlak, vayvod of Transylvania. The more patriotic of the nobles, longing for a native ruler, spontaneously turned their eyes to Matthias, the younger son of John Hunyadi, who had marvellously escaped the fate of his elder brother. Treacherously carried away from Buda to Vienna by Ladislaus Posthumus, Matthias, but four¬ teen years old, was conveyed to Prague, where he arrived just at the death of the Hungarian king. At this juncture he was rescued by Podiebrad, who was about to ascend the throne of Bohemia, and, as afterwards appeared, aimed at making the young Hunyadi his son-in-law. The party of Frederick were masters of the fortress of Buda, and in their confidence issued writs for the assembling of the diet. The Hunyadi party found an able leader in Michael Szilagy, uncle to the young Matthias, and an army of40,000 men stood ready before Pesth to support the cause of the young king. A sudden severe frost which covered the Danube with a thick sheet of ice, and thus facilitated the approach of Buda, turned the scale against the Hapsburg emperor. On the 24th of January 1458, the diet proclaimed Matthias king of Hungary, and declared Szilagy governor during his minority. A depu¬ tation immediately repaired in great pomp to Bohemia, and recovered Matthias from the hands of Podiebrad, who was pre¬ sented with 60,000 ducats, and had the satisfaction of seeing his favourite marriage scheme realized. All chroniclers agree in describing the tumultuous joy that was manifested in Buda-Pesth at the arrival of the boy-king. Though but fifteen years of age, Matthias spoke—besides Hungarian—Sclavonic, Bulgarian, German, and Latin, and un¬ derstood almost every other European language. His father used to employ him as his interpreter and secretary, having been famous when a boy for his excellent writing at a time when (as a German historian of Hungary, whom we now follow, says) the vayvods and other high officials could hardly sign their names. To these accomplishments, and an acquaintance with the classics, Matthias added the talents of an impressive orator, and also of an able general. Simply in consequence of the hopes entertained of him as a warrior, the papal legate in Hungary, John of St Angelo, exerted his influence in favour of the Hunyadi party. The Emperor Frederick,determined to dispute the Hungarian throne with Matthias, openly assumed the title of King of Hungary (1459) ; but after being defeated by the Hungarians, he agreed to an armistice, which Matthias employed in march¬ ing against the Turks, who were ravaging the Danubian Prin¬ cipalities, Bosnia, and Servia. Having compelled Mohammed II. to evacuate those provinces, Matthias again turned his arms against the emperor, and compelled him to conclude a peace in 1463, renouncing all claim to the dominion of Hungary, and delivering up to the Hungarians the crown of St Stephan. One of the conditions of this peace is said to have been, that in case of Matthias dying without issue, the right of succession should revert to the emperor, or his son Maximilian. After this peace, Matthias again turned his arms against the Turks, having previously reorganized the military system of the kingdom. In room of the privileged commanders of the fortresses, he appointed men experienced in the art of war ; and in place of the somewhat lawless irregular horse, he deter¬ mined to make the foot soldiers the pivot of his strength, and among these the most famous were the Armigeri, alias the Black Legion. From the irregular horse he formed the hussars, a species of light cavalry, subsequently enrolled in almost every European state. All these troops were drilled by the king in person, inspired with a feeling of honour, and assured of meet¬ ing with due distinction. The Armigeri, as it appears, were in his camp what the tenth legion was in that of Caesar, a sue- Hungary,, cour for the archers. These changes being effected in the mili- v. , • tary system, Matthias began to turn his attention to the state of education. He founded a university at Buda calculated to afford accommodation for 40,000 students, and provided with a library of 55,000 volumes, bearing the name of Corvina, and possessed of many valuable manuscripts bought from Greek scholars who had fled from Constantinople, or such as were copied in different parts of Italy. To this was soon added a typographical establishment. But amid these occupations the hero king was summoned to the field. Mohammed, who vowed to unfurl the banner of the prophet on the ramparts of Belgrade, invaded Moldavia in 1466, after having come to a secret understanding with the vayvod Ste¬ phan ; but here too the Hungarian arms were triumphant. Mo¬ hammed now sent ambassadors with offers of peace, while the papal legate was endeavouring to persuade Matthias to a war against Podiebrad and the Hussites. When it was deliber¬ ated in the diet, whether the continuation of the Turkish war or a war against the Bohemians was preferable, the prelates pronounced for the latter, and so did the king. Matthias thus undertook a war against Podiebrad, his former father-in-law, already excommunicated by the pope, announcing, however, in his proclamations, that he took up arms only to defend the rights of the Catholics against the Hussites. The Em¬ peror Frederick secretly designing to secure the Hunga¬ rian throne for his son Maximilian, fanned the ambition of Matthias, whose armies marched from victory to victory, and in a few weeks conquered three kingdoms. Accordingly, in May 1469, Matthias caused himself to be proclaimed, at Olmutz, King of Bohemia and Moravia, and received, a few days after¬ wards, the homage of the Silesians at Breslau. Meanwhile, the Turks repeated undisturbed their incursions in Bosnia and Croa¬ tia, a circumstance which created in Hungary a party against the king, who was opposed in Bohemia by the king of Poland. Returning to his kingdom, and restoring order within, Mat¬ thias again marched to gain fresh laurels in conflict with his old foe. A most bloody battle was fought in Transylvania, on the banks of the Marosh, in 1479, where about 100,000 Turks, under Ali Beg, were defeated by Stephan Batory and Paul Kinisy. The victors, says a chronicler, celebrated a great feast on the battle-field—Paul Kinisy, a man of prodi¬ gious strength, having danced while holding a slain Turk be¬ tween his teeth. Amid these victories Matthias celebrated his second nuptials, having married Beatrix, daughter of Fer¬ dinand of Naples. The death of Mohammed, which happened in 1481, was an event calculated to relieve Hungary from all apprehensions, and to re-establish general peace, when the war with the emperor, encouraged by Pope Sixtus II., was rekindled. To this pope, who counteracted his designs on Veglia, in Dal¬ matia, and raised a rival to the bishop of Mordusch, nomi¬ nated by himself, Matthias had the courage to threaten that Hungaria would exchange the double cross with the triple one, or that it would nominate a patriarch to herself. Pope Innocent VIII. Matthias defied by keeping in prison the Archbishop Varda. With the renewal of hostilities the Haps¬ burg monarch was destined to undergo most unexpected mis¬ fortunes. After a siege of four months, Vienna opened its gates to Matthias (June 1485), and the emperor was obliged to roam in disguise from village to village. Matthias entered the capi¬ tal of the Hapsburgs at the head of 8000 troops. The con¬ quest of Austria so much heightened the credit of Matthias with the Turks, that Sultan Bajazet despatched to him an em¬ bassy, bearing the congratulations of their master, and followed by ten camels laden with presents. Despite all the efforts of Frederick and his German allies, Matthias made Vienna for five years the seat of his govern¬ ment, and died there on the 22d of April 1490, in the forty- fourth year of his age, and thirty-third of his reign. Besides the Italian Galeotti, this powerful monarch of Hungary found hispanygerist in Bonfinius, the author of Decades IV. Rerum Ungaricarum, both of whom have recorded many an anecdote and trait of private life, highly characteristic of their hero. During his reign Buda was the seat of many men of letters, whom he distinguished by peculiar favours, and who were mostly members of the two Hungarian learned societies esta¬ blished under his care. At the death of Matthias the competitors for the Hunga- HUNGARY. 15 Hungary, rian crown were John Corvinus, a natural son of Matthias, the Emperor Frederick, his son Maximilian, and Wladislaus II. of Poland. The States declared for the last, whose inglo¬ rious reign is worthy of mention for the collection then made of the laws of the realm, and their sanction by the king and the States in loll. This code is known as the Tripartium Opus Juris Consuetudinarii inclyti Regni Ungarice. Some supplements were made to it in 1628, all of which were after¬ wards merged in the Corpus Juris. After his death Wladislaus was succeeded by his son Louis, under whose short reign Hungary hastened fast towards de¬ struction. The ambition of the oligarchs, no less than the carelessness of the king, left the frontiers unprotected, and that at a juncture when Soliman the Magnificent, the most power¬ ful of Ottoman emperors, commenced his career. Having cap¬ tured Belgrade and Petervardein, Soliman advanced at the head of 200,000 men into the interior of the country. This formidable force the weak king, idly confiding in the assistance of his brothers-in-law, the Emperor Charles Y. and Ferdi¬ nand, had the rashness to meet with 25,000 men. The Turks lay encamped on the plain of Mohacs, near a town of that name, situated between the Danube and the Drave. After three days’ skirmishing the archbishop of Kolosa, Paul Tomory, urged a general attack, and within an hour and a half the kingdom of Hungary lay in the dust. The king, two arch¬ bishops, five bishops, 500 of the higher nobles, and almost the whole army, perished in the carnage. This battle took place on the 29th of August 1526. After this victory Soliman marched onwards, captured Buda, where all that told of the fame of Matthias Hunyadi fell a prey to the blind rage of the Janissaries, and turning homewards, dragged in his train tens of thousands of prisoners. We have now arrived at the point when the quasi Haps- burg reign commenced in Hungary, an event which proved the cause of wars for nearly two centuries. Before pro¬ ceeding in our narrative, however, we shall briefly refer to the constitutional part of the history; and to preserve unity, we shall also add the fundamental laws enacted during the subse¬ quent, or Hapsburg period. Constitu- Like the constitution of England, that of Hungary is the tion. work of ages, the aggregate mass of consuetudinary and writ¬ ten laws or acts of parliament. The right of succession belonged, from the very establish¬ ment of the Arpad dynasty, to the male line, though with the extinction of that line, and the accession of the Anjous, the States departed from the rule which excluded females from the throne. In the year 1687, the Emperor Leopold, under gene¬ ral terror, exacted from the States an acknowledgment of the right of both male branches of the House of Austria. In 1723 the Emperor Charles, who had no male issue, carried the point still farther, having brought the diet to acknowledge the here¬ ditary right of the female line, and thus secured the Hunga¬ rian throne to his daughter Maria Theresa, and her descend¬ ants, in the order of primogeniture and lineal succession. The exclusive privileges of the king are the right of nomi¬ nation to the offices of state, of conferring titles of nobility, and convoking and closing the diet. The king, moreover, no¬ minates the archbishops, bishops, and abbots ; he may establish and endow new bishoprics, and appropriate to the regal chan¬ cery the revenues of vacant sees, dispose of Church pro¬ perty, abolish convents, and fix the number of the friars. He has the right of superintending the schools and nominating the teachers to the Catholic schools. By the jus placeti the king is empowered to regulate the intercourse of the prelates with the See of Home, he regulates their oath of allegiance to the pope, and without his consent no bulls or briefs can be pub¬ lished. The legislative power is common to the king and the States, viz., the prelates, titled nobility, high officials, and the nobles. Among the barons of the realm the first in rank is the palatine, the second, the chief judge or judex curiae, the third, the ban of Croatia, the fourth, the chancellor. By the concordat concluded in August 1855, the Emperor Francis Joseph surrendered to the pope the most essential privileges of the Church. This concordat transferred to the pope the right of nominating the archbishops, of forming new and changing existing sees, of administrating the estates of the Church, of superintending the schools through the bishops, and finally, authorized the direct communication of the bishops, clergy, and people with the papal chair. The functions of the palatine, whose office dates from the Hungary, earliest days of Hungarian history, are as follows :•—He is the ^ ■- Y - * judge or mediator between the king and the people, the guar¬ dian of the minor kings, and regent during their minority and absence, president of the house of lords and the chancellery, commander-in-chief of the army, lord-lieutenant of the county ofPesth, and judge of the Cumans and Jaziges, a privileged portion of the Magyars. In 1608 it was enacted that, at each election of a palatine, the king must propose four candidates, two Catholics and two Protestants, from which the election is to be made by the diet. By another article of 1711, the office of the palatine can not remain vacant for longer than a year. The Judex curiae is the first member of the Septemvir Court and the Court of Chancery, and is president of the Upper House in the absence of the palatine. The Ban is the hereditary chief of the border regiments (the borderers in general having a special commander), and president of the Banat court. The Chancellor is member of the Septemvir Court, and pre¬ sides over the Upper House in the absence of the palatine and judex curice. The barons immediate in rank are the two keepers of the crown. The other members composing the States, ordines regni, are the Roman Catholic prelates, and, since 1792, the bishops of the non-united Greeks; the lord- lieutenants of the counties, the magnates, the lower nobles, and the royal towns, each of which is equivalent to one noble. By the law of 1791, confirmed in 1827, the diet must be convoked at least once every three years. In former days the diet used to be held mostly on the plain of Rakos, near Pesth, or in Weissenburg, where the former kings used to be crowned. But since the accession of Ferdinand of Austria in 1527, Presburg was chosen as the seat of the diet, because, on account of its proximity to the Austrian frontiers, it offered the greatest security to the Austrian party. It was about that time that the legislative body became divided into two Houses, or, as they are commonly called, two Tables. The bishops, high officials, magnates, and barons compose the Upper House; the lower nobility, who form the Lower House, do not attend in person, but are represented by their deputies, elected in the respective counties, which are fifty-two in number, each county sending two deputies to the diet. The free towns had also each a deputy at the diet, but their influ¬ ence was merely nominal. The three Croatian counties in¬ cluded in the above number, however, chose, according to custom, their representatives, three in number, in a common congress. Of these one is sent to the Upper, and the other two to the Lower House. Transylvania has its own diet. The initiative belongs partly to the king, and partly to the Lower House, though the royal proposals usually take the pre¬ cedence. The Upper House has only the privilege of the veto or rejection, and in case of a lengthened disagreement between the two bodies both Houses meet together. Since the end of the last century the deputies of the four districts, into which Hungary is divided, used to meet separately in what was termed circular sittings, for the preliminary discussion of the questions, till by degrees all came to meet together, thus ascer¬ taining beforehand the fate of every motion. Some writers have erroneously mistaken these circular sittings for separate chambers. The diet of Transylvania (which, as may be seen from our narrative, maintained its independence against the Austrians till the end of the seventeenth century) is formed on the same model. As in Hungary, so here, the peasantry, consisting chiefly of the Wallachs, were excluded from all participation in the legislature, the diet having been composed of the Mag¬ yars, the Saxons, and the Szekler or the Magyar borderers. This abuse was here, as in Hungary, removed in 1848. Much more efficacious than the diet against the usurpations of the crown was the internal organization of the counties, re¬ sembling, in many respects, the Swiss cantons. Next to the lord-lieutenant, the nominee of the crown, each county was governed by two sheriffs, elected by the nobles for the term of three years, and who, in the absence of the lord-lieutenant—a common occurrence—alone managed the public affairs. Be¬ sides preserving public order and administering justice, the sheriff or vice-lord-lieutenant presides over the county meetings, which are convoked several times a-year, and are of especial importance during the sittings of the general diet. The 16 HUNGARY. Hungary, grievances of the county are here debated with more freedom y ^ > than in the diet; and here are also prepared the instructions sent to the members of the diet, who, if not fulfilling their trust, are recalled. The most important feature in the county institutions, however, was the vis inertice, or the privilege of passive resistance to illegal orders, sent by the chancery or the other high courts of administration. It was this inert power that, till 184:8, often proved the sheet-anchor of the Hungarian constitutions. Next to the counties, and besides the royal towns, which are independent of the counties with regard to their internal ad¬ ministration, there are several privileged districts, _ whose in¬ habitants are exempted from all those burdens which, to the year 1848, were borne solely by the peasants. The military frontier, or that narrow tongue of land which extends along the Turkish frontier, as may easily be conceived, has an organiza¬ tion of its own, to which we shall return when speaking of the military force of Hungary. Above all these political and civil subdivisions there were two central courts at Buda, and a separate chancellery at Vienna, whose sphere extended over the political, ecclesiastic, and finan¬ cial and administrative departments at large. The evil effects of these irresponsible organs of general administration having of late years become more and more deeply felt, the final con¬ sequence was, that in 1848 King Ferdinand V. was obliged to comply with the wishes of the diet, and nominate an indepen¬ dent responsible Hungarian ministry. This compliance on the part of the Hapsburgs (as it will be found in its proper place) gave rise to instant war, which, after having been brought to an end by Russian intervention, resulted in the entire subver¬ sion of the fundamental laws of Hungary. To return to the political and social description. The feudal privileges having exempted the nobles from par¬ ticipation in the public burdens, the whole weight consequently fell on the peasantry, the misera plebs contribuens. Besides the feudal labour called robat which he had to perform to his master, the peasant had to pay the military-tax, to supply the house-tax, from which the expenses of the administration of the counties were defrayed, to repair the roads and bridges, to give quarters to the soldiers, to convey, for a nominal price, the county officials or military officers, to pay the ministers and schoolmasters, and lastly, to give one-ninth of his pro¬ duce to his landlord, and tithes to the Catholic clergy, even although a Protestant. An earnest cry against this evil was raised only within the last twenty-five years, and in 1848 the liberal party at last triumphed, both the court and prelates having felt obliged to sanction the abolition of feudalism. Churches. As regards the ecclesiastical institutions, they may chiefly be divided into three distinct parts—the Roman Catholic, the Protestant, and the Non-United Greek. The Roman Catholic Church counts three archbishops and seventeen bishoprics. The foremost among the prelates is the archbishop of Gran, the primate of Hungary. Since 1452 he has borne the title of legatus natus to the see of Rome, and since 1715 that of prince, and is moreover by right the lord- chancellor of Hungary, and lord-lieutenant of the county of Gran. It is his privilege to crown the kings of Hungary, while the archbishop of Vesprim claims the right of crowning the queens. In influence, however, the Roman Catholic bishop of Transylvania comes next to the primate. The united Greeks form one body with the Roman Catholics, and have four bishops. Each bishop has his own consistorium. The Protestant or Lutheran Church is divided into four su¬ perintendencies, consisting of several seniorates or sections of a certain number of communities, and these in turn have each their inspector, and the right of electing their own pastors. Besides the ecclesiastical superintendent or principal, each su¬ perintendency has its lay-curator. The annual meetings of the Protestants are held at Pesth, under the presidency of a chief inspector. The internal organization of the Calvinists is with slight ditferences, and those also rather nominal, similar to that of the Lutherans. * Since the end of the late war the Austrian government deprived both the Protestant churches of their liberties. The head of the Non-United or Orthodox Greek Church is the archbishop and metropolitan of Carlovitz, who is chosen in a congress, and whose election must be confirmed by the king. This church counts seven bishoprics, viz., at Temes- var, Yerscez, Arad, Old Buda, Neusatz, Pakratz, and Karlstad. The number of the ministers of the different confessions was, Hungary, according to the latest census, as follows :— Homan Catholics 9734 Calvinists 1812 United Greeks 890 Lutherans 648 Non-United Greeks 2830 According to ancient usage and laws, the military force of Army. Hungary consisted of three ditferent elements—1. The bor¬ derers, who date from the earliest days of Hungary, and who were again reorganized during the reign of Ferdinand I. ; 2. The regular army ; and 3. The levy of the nobles, who in times of danger took the field en masse, which was known by the name of insurrectio. The organization of the borderers, where every man is a soldier, is mixed up with a sort of patriarchal rule. Each family, though consisting of several members, oc¬ cupies what is called one border-house, to which a small tract of land is allotted, and the management of which is carried on by the paterfamilias, no longer fit for military service. Every borderer is liable to be called to duty wherever the king pleases, though in general the service is confined to the cordon or the watching of the frontiers. And in such cases the borderer must be fed and clothed by his own family, in consideration oi which it is entitled to an annual deduction of twelve florins from the taxes. The whole force consists of fifteen infantry and one cavalry regiment, besides a battalion of pontooners, called chaikists, and makes in times of peace a total of 46,000 men. On a war footing this force was capable of considerable increase. The number of men constantly employed at the cor¬ don and quarantine averages between 4000 and 6000. The regular military force of Hungary consists of thirteen (infantry) regiments of the line, besides the two Transylvanian and eleven hussar regiments, each infantry regiment number¬ ing above 3000, and each cavalry regiment about 1800 men. The total military force is thus above 100,000. In process of time the regular military force of Hungary be¬ came entirely merged in, and assimilated to, the Austrian army, the States contenting themselves with exercising the right of voting recruits, and fixing the term of service, which since 1830 was limited to ten years. Their^ gross and palpable ne¬ glect is shown in the fact that they quietly allowed Austria to carry on that subtle game by which the Hungarian troops were carried abroad, and foreign regiments introduced. The reforms of 1848 have done away with this antiquated abuse. The most important fortresses are Comorn, on the Danube, between Pesth and Presburg, Petervardein, also on the Danube, Arad on the Marosh, Temesvar, Ejsek, and lastly Buda, strong by nature. The most important fortress in Transylvania is Karls- burg. Transylvania forms a fortress in itself, and. only a few narrow passes afford a passage through its mountain ramparts to an invading army. The principal passes are the Bozza, which leads to the Bukowina, the Ojtos, leading to Moldavia, the Tdrzburg, Tombs, and Red Tower passes, which communi¬ cate with Wallaehia. It was through these last-named passes that the Russians penetrated in 1849. Mention must be made of the Dukla pass, leading from Galicia into the north of Hungary, and through which Prince Paskiewitsch came with the guns of the Russian army. Having thus described the constitutions of the country, we Resources, shall now rapidly survey its resources. The fertility of the Hungarian soil, and the variety of its produce, are universally known. Besides the different species of corn and maize, raised in great quantities, Hungary produces hemp and flax, various kinds of delicious apples, pears, and plums ; two sorts of melons, rich crops of tobacco, and lastly, a great variety of wines; while the vast pastures and oak woods afford ample sustenance to herds of horned cattle, sheep, and swine. It is assumed, that with the aid of modern improvements in agriculture, and a little more industry, it could abundantly sustain a population twice as large as it ac¬ tually possesses. The badness of the roads,the neglected state of the rivers, which, besides being closed to navigation, en¬ tail great losses by annual inundations, no less than the feudal institutions, and prohibitive system of Austria, all contributed to keep agriculture in a backward state, so that the vast pro¬ duce may be said to come from the hand of nature alone. The home of the wheat is the Banat, and the counties of Bacs, Baranya, Simia, Arad, and Borsod. Rye is raised chiefly in the north among the Slovaks; barley, oats, and maize, in dif¬ ferent parts. The last occupies an important place in the Hun¬ garian harvest. With some of the Sclavonian population, such HUNGARY. 17 H arv as the Croats and Rascians, and the Wallachs, maize bread is t g > a great favourite. Melons are raised in gardens and the open field, occupying sometimes continuous tracts of land of 100 acres. Of the water-melons the most famous are those of Heves, of more than two feet in diameter. The yellow or sugar melons are gene¬ rally of a much smaller size. Tobacco grows almost every¬ where, and greatly varies in flavour ; the Csetneker of the county of Gdmdr, the Yerpeleter and Debroer of Heves being the most highly prized. The annual crop is upwards of650,000 cwts. Potatoes form but a secondary article in Hungarian economy. Among the vine hills and gardens, cultivated since the thirteenth century, and which occupy no inconsiderable part of the Hungarian soil, the most valuable is the Hegy-alja, or southern promontory of the Carpathians, and which compre¬ hends the Tokay mountains situated round the town of that name. The whole promontory occupies above 50 English square miles, of which only one-third is under cultivation. The Tokay wine is of a crystalline yellow, and sometimes greenish colour, and is known under two names, the Ausbruch, the stronger, containing more of the essence, and the Maslas. The whole annual produce is 180,000 gallons. Next in rank to the Tokay is the Menes, a red wine of the county of Arad ; and inferior to it, though by no means inferior to Burgundy, are the red wines of Erlau, Szeksard, Villany, and Buda. Among the yellow table-wines, particular mention may be made of the Nesmeler, Somloer, Badacsoner, and Ermeleker. The county of Simia is, moreover, particularly famous for its red wines, the most known of which is found on the Fruska Gora mountain. No less famous are some of the Croatian wines, marked by a spirituous flavour, as well as the wines of Transyl¬ vania. The total produce of wine, Transylvania not included, is estimated at 328,748,000 gallons. Animals. The animal kingdom exhibits no less abundance. The Hun¬ garian oxen are the largest breed in Europe. They have a grayish white skin and long straight horns. The largest herds graze on the wide pastures situated between the Theiss and the Danube. The original Hungarian horse, marked by its middle size, broad neck, and compact build, is now only to be found in some parts of Transylvania. The introduction of English full-blood stallions by several of the magnates, has of late years ennobled the breed, and the general improvement has been hastened by the royal studs at Mezo-hegyes and Babolna. Of late years much progress has been made in the breeding of sheep, though the first step dates from the reign of Maria Theresa, vrlien the Merino was, for the first time, imported into Hungary. The oak-woods pasture large herds of swine, part of which arrive annually from Servia, Bosnia, and the Danubian Principalities, for the purpose of being fattened, and thereafter exported to Austria. Mules, asses, buffaloes, and goats, are only to be found in very small numbers. As the war of 1848 made a great havoc in the animal kingdom, the census of 1850 cannot afford a fair representation of the capabilities of the country. We shall therefore give here the statistics of the year 1840, which stood as follows :—Horses, 1,000,000; homed cattle, 4,260,000; sheep, 17,000,000; hogs, 4,000,000. In Transylvania, the numbers were these:—Horses, 397,388; horned cattle, 800,000 ; sheep, 2,000,000 ; hogs, 350,000. To this abundance must be added a great number of domesticated fowl, especially geese and turkeys, and a va¬ riety of game, such as ducks, partridges, pheasants, &c. The rivers abound in carp, pike, and sturgeon—the Theiss being reckoned the richest; the peculiar Hungarian fish called fogas, is only found in the Balaton Lake, or Platton-see. Some of the waters yield trout, and large quantities of leeches. The approximate amount of the productive soil, both in Hungary and Transylvania, in the latter of which the forests form more than one-half, is, according to the Austrian official tables, 40,200,000 joch, or 57,204,600 English acres, of which 10,131,760 belong to Transylvania. The relative division is as follows, in English acres :— Acres. Soil under tillage.... 22,651,438 Vineyards 1,659,962 Meadows 5,711,773 Pastures 5,662,299 Forests 15,880,680 In the above numbers is not included the military frontier, the productive soil of which occupies about 6,000,000 acres; VOL. XII. the forests forming one-third. The produce in corn is—Hun- Hungary, gary,281,000,000bushels; Transylvania, 30,000,000; military v ^ frontiers, 12,000,000 ; total, 323,000,000 English bushels. The value of the natural products is estimated at L.29,000,000, while the value of the crops in England and Wales is esti¬ mated by M‘Culloch to be only L.83,656,071. Let us now glance at the mineral kingdom. The mountains, Minerals, which are partly worked by the government and partly by pri¬ vate enterprise, contain metals of almost every kind, viz., gold, silver, iron, copper, lead, antimony, zinc, alum, orpiment, tel¬ lurium, and many other minerals, besides coal and salt. In the neglected state in which the gold mines are kept, the pro¬ duce is only about 2400 marks. The silver mines yield 65,000 marks. Of great importance are the copper mines in the Banat; the richest vein, however, is at Schmolnitz. Those in Transylvania, at Damokos and Deva, yield 1200 cwts. The produce of lead is estimated at 26,000 cwts. The iron mines are found chiefly in the counties of Gomor, Sohl, Ung, and Zips ; the average produce of the former being 250,000 cwts. The richest rock-salt mines are in the county of Marmoros, and the total produce amounts to upwards of 800,000 cwts., a quantity which, however great, is far from sufficient for the wants of the country. Several places yield also soda, saltpetre, alum, and potash. Pit coals, which, till very lately, and be¬ fore the introduction of railways, had been entirely neglected, lie in deep formations almost unwrought. The total produce is 1,000,000 cwts. The value of the mineral produce in Hungary is L.872,000, that of Transylvania, L.169,000 ; the military frontiers yield almost nothing in this respect. It must be added, that Hungary possesses also precious stones and marble of various descriptions. The chief articles of manufacture are cloth, linen, and silk Manufac- stuffs, carpets, leather, iron wares, and chemical products, in-tures. eluding alum, saltpetre, and potash manufactures. All these are as yet in an incipient state, especially cloth manufacture, if it be considered that in wool Hungary is the richest country in Europe. Linens are chiefly manufactured in the north. The county of Zips produces about 6,000,000 yards. The largest silk manufacture is at Pesth, giving employment to between 400 and 500 men. Of greater extent are the leather manufactures; but even of this article much is imported. The most productive iron works are in the county of Gomor, among which are particularly distinguished the manufactories of Poho- rela, and Yorosko, belonging to the Prince Saxe-Coburg. The whole iron produce of Hungary is estimated at 500,000 cwts. per annum, half of which belongs to Gomor. In several coun¬ ties there are potteries and glass-works, as well as powder- mills ; and also clay-pipe works, some of which, as at Debrec- zin and Papa, produce 20,000 bowls weekly. Soap is chiefly manufactured in Szegedin, Kecskemet, and Debreczin, the last of which produces 7000 cwts. annually. The distilleries are mostly in the north among the Sclavonic population ; and the breweries, 300 in number, are situated round the large towns of mixed population, as beer is no favourite drink with the Magyars. Sugar refineries have also of late risen in several parts of the country ; but this article also requires importation. The cigar manufactories, introduced within a very recent period, had imparted a new impetus to the cultivation of to¬ bacco ; but the introduction of the tobacco monopoly at the end of the late war, at once extinguished this branch of in¬ dustry. The inferiority of the roads, only compensated to some ex- Trade, tent by two railway lines, and steam navigation on the Dan¬ ube and Theiss, but especially the restrictive commercial sys¬ tem of Austria, sufficiently account for the insignificance of Hungarian commerce, both foreign and internal." The centre of commerce is the capital, Pesth, situated on the banks of the mighty artery of the kingdom, the Danube. The chief feature of internal trade is the exchange of products between the northern and southern districts ; the former sending to the south minerals and timber, and the latter carrying to the north grain and cattle, an intercourse facilitated by the great number of rivers navigable to vessels and boats of small freight. The annual fairs held at Pesth mark the culminating points of com¬ mercial activity, the chief marketable article being wool, of which, according to Fenyes, upwards of 120,000 cwts. are sold annually. The other towns of commercial importance are—in the south, Becse exporting to Austria ; Fiume, the Hungarian littorale, and Semlin, communicating with the Turkish pro- c , 18 HUNGARY. Hungary, vinces: in the west, Waitzen and Presburg; in the north, . Koshau and Eperies. ■p The following details, collected by Fenyes, will give a gene- J 1 ral idea of the extent and progress of the foreign commerce during the five years immediately preceding the late war: Exports in 1840. Cwts. Wheat 1,313,626 Rye 190,770 Barley 201,194 Oats 488,639 Wool 237,740 Tobacco 336,473 Exports in 1845. Cwts. Wheat 2,408,118 Rye 942,013 Barley 364,614 Oats 782,812 Wool 214,446 Tobacco 211,625 The number of exported cattle in 1845 was 106,230, that of hogs, 352,440. The total value of exports that year was esti¬ mated at 71,735,683 florins, which, at the rate of ten florins to a pound, is equal to L.7,173,568. Imports. rflie value of imports, both from Austria and other countries, was, in the same year, 68,514,437 florins, or L.6,851,443. Foreign countries, it must be added, enter only for one-fourth of this intercourse, the rest belongs entirely to the Austrian dominions. Since the end of the late war the custom-duties between Hungary and Austria have been abolished. In how far this change has hitherto affected the commerce of the for¬ mer would, in consequence of its abnormal political state, be difficult to decipher, even if the requisite data had been made public. As difficult would it be to form a sure estimate of the revenue and expenditure of Hungary since the late war, as both rest on momentary arbitrary measures undertaken either as precautions against revolution or in consequence of the perio¬ dical sickness of the Austrian finances. Ample data, however, are extant as to the public revenue and expenditure of Hun¬ gary before 1848. The chief sources of revenue up to that date were—the house-tax, war-tax, the toll duties, the crown and fiscal domains, and salt revenues, which, with the minor sources of income, such as the lottery, the post-office, and the mines, yielded, according to Fenyes, L.3,400,000, a sum less than that of Lombardy, but more than sufficient to cover pub¬ lic expenses, in consequence of the internal organization of the counties, where the salaries of the constitutional officials were but nominal. In the new regime a not unimportant item in the public revenue is the tobacco monopoly introduced into the Hungarian dominions by an imperial edict of November 1850. By this edict no one may cultivate tobacco, except by previous permission, specifying the place and mode of cultiva¬ tion, each owner being obliged to deliver up his produce to the government, which determines its value. The monopoly in itself, no less than the domiciliary visits to which it gave rise, greatly injured this thriving branch of Hungarian indus¬ try. A great many, indeed, have in consequence of this given up its cultivation, dispensing even with its use. Education. Education, which has likewise undergone great changes since the war of 1848, has within late years made greater progress than general industry. The existence of feudality, we need hardly say, was incompatible with the education of the lowest and most numerous class of the population, the peasants; nor could much be expected from a bourgeoisie just starting on the road of activity and wealth. Mental culfure thus became chiefly restricted to the nobles. They sent their sons to the colleges to acquire that knowledge and attain those degrees without which they could have made no figure in pub¬ lic life. Hence the vast number of advocates in Hungary, of whom only a small fraction make their appearance at the bar. Among the Protestants, who had enjoyed complete independ¬ ence with regard to their ecclesiastical affairs and instruction, elementary schools had been established in almost every vil¬ lage, so that the rising generation of that confession surpass at least their parents in the knowledge of reading and writing. Among the Roman Catholic and Greek Catholic population the number of elementary schools is comparatively very small, and the case is the same with the Non-United Greeks, who, like the Protestants, are in this respect independent of the government. The higher schools of both confessions have generally each a fund, derived mostly from landed property, though the Catholic schools are much richer, and, as already observed, stand under the immediate control of the government. Hun¬ gary numbers one university (at Pesth), 21 lyceums, 28 theo¬ logical and 17 philosophical schools, 95 gymnasiums, and 2293 elementary or reading schools. This number does not include Hungary, Transylvania, which possesses 25 gymnasiums and 286 read- v JT v-^ ing schools, besides 8 lyceums and 10 seminaries, where theo¬ logical and philosophical courses are given. The difference between the lyceums and philosophical schools is, that in some of the former the philosophical studies are but preparatory, though in general, and especially in those that are Protestant, they embrace also chemistry and law. The university of Pesth, where instruction is gratis, counts 45 professors, besides extra¬ ordinary lecturers. Of these 8 occupy the theological, 6 the juridical, 18 the medical, 14 the philosophical chairs, and 1 fills the chair of mathematics. The philosophical course lasts for two, law for three, theology for four, and the medical course for five years. The last entitles to the degree of M.D. The students of surgery do not, like those of medicine, in a wider sense, require to have previously passed the philosophi¬ cal course, Most of the lectures at this university are delivered in Latin, although of late years some of the professors began to employ the Magyar language. The university boasts of a rare collection of natural curiosities, a large library, and a spacious botanical garden. In the year 1847 there were at the university 65 theological, 214 juridical, 559 medical, 253 philosophical, and 43 mathematical students ; total, 1134. The number of children attending the elementary schools was estimated at 230,617- A deadly blow was inflicted on both public and private education by the concordat already referred to, by which the schools are placed under the direct surveillance of the bishops. Even the Protestant schools must restrict themselves to the use of the books selected by the papal censors ; and we find that even Cicero and Demosthenes have been placed on the list of proscribed authors. Amongst the most promising institutions are thePhysical Society, established in 1841, and the Assembly of Naturalists, annually held in different parts of the country. The Hungarian Learned Society or Academy of Sciences is the supreme representative of the national culture. This society, first constituted with royal sanction in 1830, consists of 212 regular, and a large number of corresponding members, a certain number of the former participating in a small annuity. The programme of the society is rather ambitious, being divided into six sections, viz., philology, philosophy, history, mathematics, jurispru¬ dence, and natural philosophy. Two of these sections, history and jurisprudence, enter but nominally into their labours, being virtually proscribed by the Austrian government. The national museum at Pesth, founded by Francis Sze- cheny, father of the famous Stephan Szecheny, deserves parti¬ cular mention. The collections in the museum, both in the nu¬ mismatic and natural departments, are varied, and of the most precious kind, and so, especially in a national point of view, is the library department, comprising, besides a great number of rare books, many valuable manuscripts. The department of art vies in excellence and rarity with the rest, and its value was considerably increased by the munificent present of 300 pictures, made by Ladislaus Pyrker, archbishop of Erlau. The massive edifice, situated in the centre of the town, in a free open square, is in good keeping with the rich treasures it con¬ tains. Knowing the Asiatic origin of the Magyars, it is hardly Literature, necessary to say that their language is also Asiatic, though it has by no means hitherto been exactly determined to which great class it belongs, According to Balbi, who divides the known languages into five classes, the Magyar belongs to the Oural stock, comprising the Finnish, Lapland, and Permean languages, and which as such are contradistinguished from the Asiatic stock in which the Samoied and Tartar languages are comprehended. The Hungarian antiquarians, on the other hand, while likewise classifying the Magyar among the Oural tongues, include in this classification, besides the Finnish, also the Mogul, Tartar, Samoied, and Turkish languages, and thus make it a strictly Asiatic idiom. Recent travellers have pretty safely established the correctness of the latter opinion. The Magyar language is sonorous and mellow, rich in inflexions, copious in expression, and most logical in its derivatives. The literature of Hungary has suffered severely from the exclusive worship long paid to the Latin, a circumstance due to the in¬ fluence which the foreign monks naturally acquired on the con¬ version of Hungary to Christianity, and her simultaneous transformation into a monarchy on a European model. Raised by King Stephan to the peerage and the highest offices, the Hungary. HUNGARY. 19 ecclesiastical order, at first the sole lawgivers, and for centuries the only class possessed of European knowledge, became the means of establishing the Latin at court, of introducing it into the administration, and, from their ignorance of the Magyar language, of introducing it exclusively into public worship. Having thus become the language of the higher classes, or the ordines regni, the Latin continued, despite the Reformation, to monopolize the field of literature till the close of the eigh¬ teenth century. The earliest publications in Latin worthy of particular men¬ tion, are the Chronicle by the anonymous notary of King Bela II., of the middle of the twelfth century, which describes the first ages of Hungarian history in connection with the Huns ; the Chronicle of Simon Keza, a writerof the thirteenth century; the Chronicon Budense, and the Chronicon Rerum Hungari- carum of Johan Thurocius. A great stimulus was imparted to literature by Matthias Hunyadi, or Corvinus. Most of the beaux esprits that crowded to his magnificent court at Buda were Italians, invited to Hungary partly by Beatrix of Naples, the second wife of Matthias, though there were also several of the natives who earned well-deserved fame. The foremost among the Italians is Bonfinius, reader to the Queen Beatrix. His prin¬ cipal work is Decades IV. Rerum Hungaricarum, which com¬ prises the Hungarian history from the earliest times to the death of King Matthias. Departing from the rule of the other Hungarian chroniclers, Bonfinius diversifies his narrative with a mass of legendary gossip ; and though his attempt to imitate Livy failed, his history is highly instructive, and the most read¬ able of all the historical productions of the time. The best edition of the Decades was published, by Sambucus, his con- tinuator, at Basel in 1568. Galleotti, the principal librarian of King Matthias, wrote De ejus Dictis ac Factis, while the Neapolitan envoy at Buda, Peter Ramzan, composed a brief epitome Rerum Hungaricarum. The Tuscan Callimach pro¬ cured himself a name by his three books on the reign of Wladislaus as well as his Attila. Among the natives the most prominent place belongs to Csinige alias Janus Panno¬ nius, a famous Greek and Latin scholar in his age, and who in his youth went in search of knowledge to Italy, having spent fourteen years at Ferrara alone. Besides translations into Latin from Homer and Plutarch, Pannonius composed in Latin, epigrams, panegyrics, and a few epic poems, the greatest part of which is comprised in the Delicice Poetarum Hungari¬ carum, published at Frankfurt in 1619. Contemporaneous critics all agree in lauding the classical learning and poetic genius of Pannonius, comparing him now with 8caliger, and now with Erasmus. But however that may be, it must appear a matter of some surprise that the example of Dante and Pe¬ trarch should not have inclined his muse to sing in the lan¬ guage of the living. As regards the native, or the Magyar idiom, up to the six¬ teenth century, all that is known of it consists in MSS. of a few legends of the saints, some fragments of historical rhymes, and translations of the Scriptures. Ladislaus Batory, a Pauline monk, was the first who performed the task of translating the Bible. This translation, which was executed in the middle of the 15th century, is preserved, but in an imperfect state. Relics of another kind belonging to this period, are the oath which John Hunyadi took when elected governor of Hungary, and a few verses sung by the children at Pesth, at the corona¬ tion of his son Matthias. As in other countries, so in Hungary also, the cultivation of the native idiom received a stimulus from the Reformation, though the melancholy days that com¬ menced with the sixteenth century, and continued for two hun¬ dred years, afforded no general seat for the muses. Among the poets who wrote in the Magyar language, the best known are Baczai, Temesvari, Bogali, Yalkai, and Tinodi, who were ambitious enough in pretending to sing the exploits and glories of the two Hunyadis, and the deeds of Soliman, and the prin¬ cipal Turkish generals, and whose strains it would be difficult to rank above the level of rhymed chronicles. Kakony sang the deeds of Cyrus; and Csaktorny, improving upon Homer, rechanted Ajax and Ulysses. Of a higher order than these poetasters were Balassa and Rima, who belong to the second half of the sixteenth century. Much more important were the labours of the translators of these days. These were Komyati and Pisti, who produced a Magyar version of the Neiv Testa¬ ment (1536) among the Catholics ; and John Erdosi and Heltai among the Protestants, who translated the entire Scriptures. A new translation of the Bible for the Catholic confession was Hungary, prepared in 1626 by George Kaldi, while the Protestant ver- ^ sion was corrected and republished by Albert Molnar, the most learned of the Calvinist ministers. A few of the Latin classics were rendered into Hungarian by Decsi and Benko, and Heltai translated the laws or Tripartium, compiled by Verboczy, and the Decades of Bonfin. A writer of considerable merit and great erudition, is John Sambucus, who studied medicine as a profession, and cultivated the study of history and the classics from pleasure, having spent more than twenty years at the universities of Italy, France, and Germany. Besides translat¬ ing into Latin from Plato, Hesiod, and Hippolytus, editing several Latin authors, which procured him great contempora¬ neous fame, and composing several treatises on theology, Sam¬ bucus continued Bonfin’s Decades, to the reign of Ferdinand of Austria. The patronage he enjoyed at the hand of Maximilian was little calculated to favour his reputation as a historian. The seventeenth century, marked by the persecuting spirit of the reigns of Rudolph, Ferdinand, and Leopold, is but little better than the former, though it can boast of a few names which, in history, poetry, and theological controversy, have ac¬ quired for themselves a lasting celebrity in Hungarian annals. Nicholas Isvanfi, the locum tenens, or vice-palatine, in the reign of Rudolph, wrote, in classic Latinity, the History of Hungary from the death of Matthias Corvinus to Matthias II. of Austria, a work of great merit, though too grossly biassed in favour of the Austrian party. The Calvinist minister, Albert Molnar, already mentioned, distinguished himself by his philological labours, and especially by the composition of a Greek, German, Latin, and Hungarian dictionary; while the Jesuit Peter Pazman, afterwards primate and cardinal, en¬ riched the national language with religious productions of a po¬ lemical nature. As regards poetry, a new era commenced with the appearance of Nicholas Zrinyi, grandson of Zrinyi the heroic defender of Sziget against Soliman in 1566. The noblest production of his lyre is the Zriniad, or the Siege and Fall of Sziget. Gongybsi sung the deeds of Maria Szechy, the defender of the fortress Murany against the Austrians. In the eighteenth century, a period of peace, Hungary seemed sunk into a state of torpor, which, in the reign of Maria Theresa, was assuming, as far as the magnates were concerned, a dena¬ tionalizing tendency, and producing a complete neglect of the native idiom. From this letharg}', the nation only recovered during the reign of Joseph, in consequence of his violent mea¬ sures for the Germanization of Hungary. Societies for the cultivation of the language were now simultaneously formed in different parts of the kingdom, periodicals were started, and the language submitted to severe investigation, to be purged from foreign expressions, rendered more fixed in grammar, and to undergo a total reform. These linguistic efforts, begun by Revay, were carried on with unremitting zeal and signal success by Francis Kazinczy. The adversaries of the linguis¬ tic reform attempted to throw ridicule on the labours of Kaz¬ inczy by publishing a lampoon entitled Mondolat; but they were soon obliged tacitly to respect a man who, actuated by patriotic feelings, laboured unweariedly to remove the mental inactivity and torpor that lay heavily upon the national body, and who felt convinced that, with the revival and culture of the sonorous native idiom, the people would regain that self- esteem, buoyancy, and openness which once formed the chief features in their character. Kazinczy was far from being an original or powerful thinker. His powers mainly lay in his aptitude for adapting to the taste and opinions of his own country the ideas and general knowledge which he culled from foreign literature. The attractive and popular manner in which he advanced new rules and theories, was the chief se¬ cret of his success; and, though placed in circumstances in¬ comparably more disadvantageous, Kazinczy may be said to have done for Hungarian literature what Herder had already accomplished for Germany. (See Hungary, Past and Pre¬ sent, chap, viii., by Emeric Szabad.) His patriotism cost him, like a few of his contemporaries, several years’ imprisonment, but on his release he renewed his labours with redoubled vig¬ our. The more prominent authors and poets of that time are Dugonics, Csokonay, Dayka, Virag, and Alexander Kisfaludy, among whom the last attained the greatest popularity. Kis¬ faludy excited great attention by his long lyrical poem, The Love of Himfy, published in 1801. He also wrote several historical dramas of comparatively little merit, and highly in- 20 HUNGARY. Hungary, teresting tales of ancient Hungarian life. A few glowing odes i ^ y flowed from the pen of Daniel Bersenyi; Dobrentei and Vit- kovics excelled in popular songs ; while Charles Kisfaludy sur¬ passed his brother in the drama. An author of higher parts than any of these was Francis Kolcsey, whose articles in the periodical Elet es Literatura (Life and Literature) are beyond doubt the finest specimens of Hungarian aesthetical criticism. Kolcsey was also great as an orator, and next to Count Szeibeny, the most influential leader of the reform party. Before proceeding further it is necessary to remark, that about the end of the eighteenth, and the beginning of the nineteenth century, much was done in historical writing. The two Jesu- ites Pray and Katona have each, with much research, written in Latin the history of Hungary, from the earliest period to the reign of Maria Theresa ; while Engel and Fessler have performed the same task in the German language. A brief history reaching only to the fourteenth century was composed in the Hungarian language by Yirag. Michael Yorosmarty may be called the father of the more recent and more genuine Hungarian poetry. The first fruit of his lyre which attracted general attention was a historical tragedy, King Solomon, published in 1821, which, though deficient in dramatic effect, is distinguished, like his other pro¬ ductions, by the beauties of a chastely figurative language and noble sentiment. Three years afterwards Yorosmarty gave forth an epic, The Flight of Zalan, embodying an episode of the conquest of the Magyars, which was followed by a roman¬ tic poem, and another epic, Gserhalom, having for its burden the victories of the Magyars over the Cumans. He wrote nu¬ merous exquisite lyrical pieces. He also translated several of Shakspeare’s plays, and, as a member of the Academy, contri¬ buted much to the philological department. Next to him in rank are Bajza, Czuczor, and Garay, the last of whom acquired unusual popularity by his series of ballads relating to the Arpad period. More recently Alexander Vachot, John Erde- lyi, Francis Csasar, and a few others, earned a high name as poets ; and in 1842 Hungary received the first fruits of Alexander Petofy, destined soon to become the most popular of her bards. His most successful pieces are those descriptive of country life. Petofy disappeared amid the carnage of battle in 1849, and since then nothing has transpired as to his real fate. Tompa, another popular poet, is in some respects supe¬ rior to Petofy; and Arany gained a sudden popularity in the field of epic poetry. As a humorist, the palm belongs to Sa- rossy ; his Golden Trumpet, descriptive of the late war, being a very singular production. The most promising of the recent minstrels are Hiador, Szasz, Gulay, and Levay. Baron Josika may be said to have done for prose what Va- rosmarty did for poetry, having been the first to produce genu¬ ine novels. The most popular works of this prolific author, now an exile in Belgium, are,—The Bohemians in Hungary, in which Matthias Corvinus appears on the scene; The Last of the Batorys ; and Abaft, Prince of Translyvania. Baron Oetvos, better known as apolitician, earned celebrity as a writer of political novels; while Kuthy, an author more original, and possessed of a richer fancy than either of the preceding, en¬ riched the literature with several works of fiction, chiefly de¬ scriptive of Hungarian life and scenery. The familiar prose writers belonging to a more recent date are Baron Kemeny, Charles Berczy, and Moritz Jokay. This last author is as pro¬ ductive as he is popular. Political writing dates from Count Stephan Szechenyi ; his first production, The Credit, em¬ bodying a series of proposed reforms, not a little startling to the feudal lords, was published in 1830. It soon called into action the pen of Count Joseph Dessefy, and several other con¬ servatives ; and was followed by another work, The Light (A Vilag), and the Stadium. In the last the Count particularly expounds the necessity of means of communication, and of re¬ forms in the laws of credit, as well as the importance of capi¬ tal for the promotion of industrial activity. At the appear¬ ance of Kossuth on the field of journalism in 1841, Szechenyi came forth with his People of the East (Kelet Nepe), a most re¬ markable mixture of polemics and prophecy, and which called forth a separate answer from the powerful and popular editor of the Pesti Hirlap. Szechenyi’s last work, Political Fragments, was issued on the eve of the war of 1848. Of considerable in¬ fluence were the political writings of Baron Oetvbs and Szalay, who superseded Kossuth in the editorship of the Pesti Hirlap. Szalay also contributed short biographical sketches of modern English and French statesmen; as a sort of supplement to Hungary, which, there lately appeared, under the editorship of Csen- ^ ^ ; gery, sketches of Hungarian politicians; and since the late war he has written also a History of Hungary, The most valu¬ able contribution in the field of literature is Count Joseph Te- leky’s voluminous history of the Hunyadi period (A Hunya- diak Kora). The noble author, formerly governor of Tran¬ sylvania, dedicated upwards of twenty years to the composition of this work. In antiquarian research and natural sciences the most prominent names are Stephan Horvat, Fejer Koller, and Schedius. In Peter Vajda, distinguished as a poet, who was car¬ ried away by premature death, Hungary lost one of its most ori¬ ginal philosophic writers. Since the end of the late war, lite¬ rature has assumed a more scientific and abstract tone, as is shown by the increasing number of text books of natural science published within the last few years. The approxi¬ mate number of books that appeared in 1853 was 230, and in 1854 this number was more than doubled. The effects of the censorship are best seen in the diminution of newspapers, which (in Magyar) averaged in 1854 between 10 and 15. Of this number only one belongs to Translyvania, The Neiv Mag¬ yar Museum, edited monthly by Francis Toldy, secretary to the Academy of Sciences. This indefatigable savant is en¬ gaged with the republication of the authors of the last three centuries. Having thus surveyed the present political and social condi- Later his- tions of Hungary, we shall resume the thread of history, tory. which we left at the battle of Mohacs (1526), when the throne became vacant by the death of Louis II., brother-in-law to Ferdinand of Austria. It is the fashion with some foreign writers here to stop short, and henceforth to merge Hungarian history into the annals of the House of Austria, a course utterly unwarranted by the nature of events. As well might a historian ignore the War of Independence of the Netherlands, and treat it incidentally in the general history of Spain. Before entering upon this so-called Hapsburg period, we shall premise a list both of the kings of Hungary and the princes of Transylvania. The latter country maintained its independence till the end of the seventeenth century :— Hungary. Years. Ferdinand I. (rival, John Zapolya) 1527-1564 Maximilian (Segis. Za¬ polya) 1564-1576 Rudolph 1 1577-1608 Matthias II 1608-1619 Ferdinand II 1619-1637 Ferdinand III 1637-1657 Leopold 1 1657-1705 Years. Joseph 1 1705-1711 Charles III 1711-1740 Maria Theresa 1740-1780 Joseph II 1780-1790 Leopold II 1790-1792 Francis 1 1792-1835 Ferdinand V 1835-1848 Francis Joseph (present Emperor). Stephan Bathari Stephan Bocskay Gabrial Bathari. Bethlen Gabor... Transylvania. 1564-1576 1577-1608 1608-1619 1619-1637 George Rakoczy 1 1637-1657 Emerik Tbkoli, Abafi ... 1657-1705 Francis Rakoczy 1705-1711 The general consternation caused by the victory of the Turks at Mohacs had barely subsided, when the majority of the nobles proclaimed John Zapolya, vayvod of Transylvania, king of Hungary ; and he underwent, in the usual forms, the ceremony of coronation at Weissenburg. Several of the mag¬ nates, influenced partly by envy to the vayvod, partly by the prospect of the favours and distinctions of a foreign court, rallied round Ferdinand of Austria, brother of the emperor Charles V., who, in addition to the family alliance upon which he grounded his right, urged the claims arising from his com¬ pact with his brother-in-law, Louis II. A year later Ferdi¬ nand likewise received the royal unction, and war accord¬ ingly commenced. Assisted by his brother Charles, and the hereditary States, Ferdinand sent an army into Hungary, be¬ fore which his over-confident rival was soon compelled to retire. Zapolya took refuge for a time in Poland, whence he solicited aid both from Soliman and Francis I. of France. The French king, then at war with the emperor Charles Y., could hardly do more for Zapolya than send an ambassador to Hun¬ gary laden with fair promises. But the powerful Sultan, though equally importuned by Ferdinand, determined to aid the native king. A large Ottoman army, led by Soliman in per¬ son, entered Hungary in 1529, and drove the Austrians before them to the gates of Vienna. An attempt to take that capital having failed, the Sultan retraced his steps. After the conclu- HUNGARY. Hungary, sion of an armistice between Ferdinand and Zapolya, the v _ b J'j war Was renewed, and at last peace was concluded at Gross- wardein in 1538. The basis of this peace was the partition of Hungary—Zapolya retaining Transylvania and several counties on the Theiss, and Ferdinand Western Hungary, Croatia, and Sclavonia. After the death of Zapolya the whole kingdom was to revert to Ferdinand. An additional clause provided for a future alliance between the offspring of the two rivals. Two years afterwards Zapolya died, leaving a son called Sigismund. The queen dowager Elizabeth, backed by a strong party, and guided by the councils of George Mar- tinussus (who, from the position of a monk, was raised by the deceased king to the rank of bishop), determined to gain the throne for her infant, who was actually proclaimed King of Hungary. The war with Ferdinand was forthwith renewed, and occasioned the second intervention of the Turks in 1541; the Sultan, Soliman, having vowed to protect the interests of the infant Magyar king against the Austrians. From this point till the close of the seventeenth century, the Ottomans maintained the possession of the greater part of Hungary. In 1547 Ferdinand and the emperor Charles at last suc¬ ceeded in buying from the Sultan a truce for the term of five years, in consideration of an annual tribute of 30,000 ducats, the young Zapolya now depending entirely on the pleasure of his Ottoman protector. With the expiry of the truce the Turks again took the field, and, on the grant of a new annual tribute promised by Ferdinand, concluded a further truce for eight years in 1562. In the meantime Ferdinand died, and was suc¬ ceeded in 1564 by his son Maximilian. The irregular pay¬ ment of the tribute having kindled the fury of Soliman, the Janissaries were anew set in motion, to be arrested at the for¬ tress of Sziget, not by the numerous armies of the imperialists, who wisely remained at a distance, but by a handful of Hun¬ garians, commanded by Nicholas Zrinyi. With a garrison of but 3000 men, Zrinyi defended Sziget against the whole Mussulman host long after its walls had been demolished ; and when ail hope was gone, and his band was reduced to sixty men, he threw open the gates, rushed with his followers upon the thick masses of the besiegers, and met death sword in hand. This event, the most remarkable in the history of modern sieges, happened in 1566. Meanwhile, the Reformation made rapid progress, especially among the higher classes, who, with the exception of three families, embraced the new creed—the Socinians gaining many adherents in Transylvania, where they W'ere favoured by the young Sigismund Zapolya. To preserve the Catholic Church from annihilation, the archbishop Olah invoked the aid of the Jesuits, the most renowned among whom was one named Peter Canisius, commonly called Canis Austriacus. In 1576 Maxi¬ milian died, and was succeeded by his dreamy, bigoted son, Rudolph, with whom the days of religious persecution com¬ menced. In Transylvania religious liberty found a protector in Stephan Bathory, who was elected prince, with the consent of the Sultan Selim, in 1571. The efforts of the Jesuits to kindle the resentment of this prince, who subsequently became so greatly distinguished as king of Poland, completely failed. A well-known saying of his was, “ that God reserved exclusively to himself three things—to create something out of nothing ; to know the future; and to rule over conscience.” The persecutions commenced in Hungary Proper against the Protestants, under the legal sanction of a dietal enactment passed in 1604, gave rise to fresh war. Stephan Bocskay, the leader of the Protestants, protected by the Porte, after having gained several victories over the imperialists, and penetrated into Austria, soon cooled the fanaticism of Rudolph, and a peace was concluded at Vienna in 1606. With Matthias II., brother of Rudolph, the dawn of happier days was ushered in. His reign, however, lasted but a few years, and Hungary was destined soon to experience the fanaticism of Ferdinand II., the hero of the “ Thirty Years’ War.” The accession of Ferdinand II. to the throne was signalized by the rise of the Protestants of Bohemia, and the renewal of per¬ secutions in Hungary. The latter were fomented by the Jesuit primate Peter Pazman, the most learned of the Hungarian prelates. In this emergency Hungary found a defender in Gabriel Bethlen, prince of Transylvania, a zealous Protes¬ tant. Bethlen entered into an alliance with the Porte, with the Protestants of Austria, and with the Bohemians. The Bohemians had elected as their prince, Frederick of the Pfalz, 21 son-in-law of James I. of England. The revolutions in the Hungary, seraglio at Constantinople, and.the dastardly conduct of Frede- ^ rick, content to abandon his subjects and save himself by flight, destroyed in embryo this combination. Notwithstanding, the Transylvanian prince, after having gained several advan¬ tages over the imperialists, led by Bouguoi, forced Ferdinand to a peace, which was concluded at Nikolsburg in 1621. . By the terms of this treaty, Ferdinand engaged to observe strictly all the laws of the country, and maintain inviolate the pri¬ vileges of the Protestants ; and Bethlen was acknowledged prince of Transylvania and of seven counties, of Hungary Proper, and promised the possession of the duchies of Oppeln and Ratisbon, in Silesia. The infraction of this treaty on the part of the emperor led to a second war, which terminated in another peace, concluded in 1628 at Presburg. And now, when the Protestant party were about to receive a formidable defender in Gustavus Adolphus, Bethlen suddenly died. Mean¬ while, the Jesuits succeeded in regaining to the Roman Church many of the most powerful of the aristocracy, who carried along with them their numerous serfs. Ferdinand dying in 1637, and the religious persecutions being continued during the reign of his son and successor, Ferdinand III., the country was again exposed to the horrors of war, and in the present instance also the national cause found a defender in the prince of Transylvania, George Rakoczy, who extorted the peace of Lintz, concluded in 1645. His elder son having preceded Ferdinand III. to the grave, he was succeeded by his second son, Leopold, whose reign forms the most tragic page in Hun¬ garian annals. At his coronation this prince engaged himself to maintain the lawrs of the country in a diploma containing the important provision, that without the consent of the diet no war should be proclaimed, nor foreign troops introduced into the country. Despite these promises, however, Leopold ordered fresh troops to enter Hungary, ostensibly for the purpose of protecting his partisan, Kemeny, in Transylvania, against Abafi, the de¬ signated prince of the Porte, but actually for the suppression of the heretics. Hereupon the Grand Vizier led his forces up the Danube, but, aided by a corps sent by Louis XIV. of France, the imperialists gained the battle of St Gotthard (1664), a victory which Leopold availed himself of for signing a hasty peace with the infidels, in order the more easily to check the heretics. Persecutions, as well as depredations, which fell equally heavy on the Catholics, now followed each other in rapid succession, and the result was, that the most devoted magnates of the House of Austria conspired to save the nation from ruin. The heads of this conspiracy were the palatines Vesselenyi, Peter Zriny, the ban of Croatia, and the chief-justice Nadasdy. The plot having been prematurely discovered, these leaders were partly seized and partly decoyed to Vienna, placed be¬ fore a foreign tribunal, and executed. The consternation be¬ came general, and the archbishop Szelepcseny established a tri¬ bunal at Presburg, before which upwards of 200 Lutheran and 75 Calvinist ministers were compelled to appear. The mad zeal went so far as to sell many of those victims as galley-slaves, some of whom recovered their liberty (at Naples, whither they had been conveyed), by the intercession of the Dutch admiral, John de Haen. The Protestants, in despair, rose inarms, and found an intrepid leader in Emeric Tokoli (1678). The Mar¬ quis de Bethune, the ambassador of Louis XIV. in Poland, greatly encouraged the Hungarians, and concluded a treaty with Tokoli, from which much was expected, but which re¬ mained unfulfilled in consequence of the conclusion of the peace of Nimeguen. No other ally was thus left to Hungary except the Porte, not a very reliable friend in hours of extreme dan¬ ger. The grand vizier, Kara Mustapha, who, despite the re¬ monstrances of Tokoli, marched straight forward to Vienna (1683), was, as is well known, compelled to raise the siege, and then routed, by the valour of Sobiesky, king of Poland. The misfortunes that henceforth overtook the Turks in Hungary, the alliance with Tokoli, and the fate of the malcontents, were but little thought of at Constantinople, then ruled over by imbecile Sultans. Nor did the court of Vienna neglect to attempt ren¬ dering Tokoli an object of suspicion to the Porte, in conse¬ quence of which he was thrown into chains and carried prisoner to Constantinople. Leopold now took revenge upon Hun¬ gary. A scaffold wTas erected in the market-place of Eperies, in the month of March 1687, and kept standing to the end of the year. For nine long months the Hungarians beheld their 22 HUNGARY. Hungary, countrymen dragged to open butchery, and if contemporary historians are to be believed, the executioners were weary of sacrificing the multitude of victims, which were without much distinction delivered up to them. These massacres, perpetrated under the auspices of General CarafFa, are known in the Hun¬ garian annals by the name of the Butcheries of Eperies. The scaffolds were yet standing when the emperor caused the diet to proclaim the crown of Hungary hereditary, and to crown his son Joseph. After these massacres Tdkoli, now released from imprisonment, again called the people to arms, resting his hopes of success on fresh engagements with the Porte. But the vic¬ tories of Prince Eugene, which resulted in the Peace of Carlo- witz in 1699, gradually dissipated all hopes, and the patriotic leader, with his followers, had no other chance left but to seek refuge in the Turkish territory at Nicomedia. The oppressive rule was persevered in even after the total destruction of the national party ; but by an almost incredible vitality, the nation at large was, three years after the peace of Carlowitz, enabled again to make a gigantic effort for inde¬ pendence. The victory of the Austrians under Prince Eugene, which led to the peace of Carlowitz, was gained in 1697, at Zenta, a village on the Theiss. By this peace the Porte aban¬ doned Hungary and Transylvania to the emperor, but was con¬ firmed in the possession of the Banat. The relinquishing of this fertile province to the Turks, as well as the fact that the emperor concluded that peace without the knowledge of the States, was sufficient to create the indignation even of the Aus¬ trian party, which largely affected their subsequent success. The leader in this fresh war, which lasted from 1703-1711, was Francis Raykoczy, prince of Transylvania. Its issue greatly depended on the great European war then carried on between France on the one hand, and England, Holland, and Austria on the other. Louis XIV. too well felt how fa¬ vourable a diversion the war in Hungary created for his inte¬ rests not to encourage and negotiate with Prince Raykoczy; while on the other hand, England and Holland were equally anxious to render him inclined to accept peace. Through the mediation of the envoys of these two countries a temporary armistice was concluded, and deliberations for a final settlement of disputes were in course, when the victories of Eugene and Marlborough rendered all appearance of mo¬ deration on the part of Austria superfluous. Hostilities thus recommenced, and were at first in favour of the Hungarians, who assembled in Onod (1707), and declared the Hapsburg dynasty dethroned. But the favourable turn which affairs took on the Rhine enabled the Emperor Joseph to send rein¬ forcements to the Danube, and the cause of the confederates began rapidly to decline. Raykoczy, discouraged and deceived in his expectations with regard to France and Charles XII. of Sweden, left the battle-field for Poland, under the pretence of seeking aid, and in his absence peace was concluded (1711) by Karoly, the chief of the Hungarian generals. At this juncture Joseph I. died, and was succeeded by his brother Charles VI. h rom this time no serious disturbance or open war took place between Hungary and her Hapsburg rulers until 1848. Charles secured the establishment of the right of succession in the female line. This right, known by the name of “ Prag¬ matic Sanction,” he obtained at the diet of 1722. In the year 1740 Charles died, leaving his throne to his daughter Maria Theresa, after having exasperated the minds of the nation by the issue of the war made in common with Anne, empress of Russia, upon the Porte, and which ended in abandoning to the i ur^s the fortress of Belgrade, and several other districts that belonged to the Hungarian crown. Ihe share which Hungary had in saving the Austrian em¬ pire from complete dissolution, during the reign of Maria Iheresa, is too familiar to be here described. Threatened by Prussia, Bavaria, and France, and appearing at Presburg as a fugitive, she had to appeal but once to the magnanimity and compassion of the States to make all of them shout with tears in their eyes, Moriamur pro recje nostro, and to make them immediately effect the insurrectio, or the general rise of the nobles. This tragico-dramatic scene took place on the 11th of September 1/41, the young sovereign addressing in Latin the ordines regni with her infant Joseph—but six months old— in her trembling arms. The chief merit of Maria Theresa lay in alleviating the con¬ dition of the serfs by the salutary changes which she effected m the feudal system. These reforms are known by the name of Urbarium. Transylvania was raised into a principality ; the Hungary. Banat, which had been governed separately since its recovery i B < from the Turks, was incorporated anew into the mother coun¬ try, while the littorale, or the district of Fiume, likewise re¬ ceived a Hungarian government. Besides the establishing of the Theresianum in Vienna, Maria Theresa enlarged the uni¬ versity at Tyrnau, which in 1777 was transferred to Buda—es¬ tablished military schools for the nobles in Waitzen and Klau- senburg, four academies at Tyrnau, Raab, Agram, and Kashau, and regulated the whole system of instruction. In short, her repeated and long stays at Buda, her measures in favour of commerce, and the creation of a Hungarian guard, were all calculated to gain for her the affections of the nation, though her consent to the repeated persecutions of the Protestants, instigated by the Jesuits and some of the prelates, does not re¬ dound to her honour. One of the Hungarian bishops, Martin Biro, went so far in his zeal as to publish a pamphlet in which, to save the credit of the Church of Rome for blood¬ shed, he strongly advised the burning of the heretics. Even Frederick the Great, at a distance, felt shocked at the pro¬ cedure of that sanguinary prelate, of which the queen-em¬ press took no cognizance at all. In 1780 Maria Theresa died, and was succeeded by her son Joseph, the last of the male line in the Hapsburg family. The reign of this philosophic monarch produced events of a different character. Hurried away by his zeal for reform, Joseph, whose Edict of Toleration shocked all bigoted minds, and who aspired at transforming the Austrian States into a uniform monarchy, thought it better to dispense with diets, and so pay no regard whatever to ancient usages, and conse¬ quently began to govern Hungary by edicts. Not content with this, he enjoined the exclusive use of the German lan¬ guage in the schools, courts of justice, and administration, and imprudently carried the crown of St Stephan to Vienna. To crown all, the exorbitant taxes which he raised for the prose¬ cution of a war against Turkey, in conjunction with Catherine II. of Russia, produced new discontent. The whole country was thus on the eve of a general war, when the king-emperor recalled all his edicts, promised redress, and suddenly died (1790). His brother and successor, Leopold, was obliged to confirm the liberties and rights of Hungary in a more explicit manner than any of his predecessors had done. Leopold was succeeded by his son Francis at a time when all the dynasties of Europe were meditating the destruction of revolutionary France. Francis swore to the laws of Hungary as readily as the other Hapsburgs had been in the habit of doing ; and the States of Hungary contented themselves with furnishing the Viennese court with men and money. The king had but to mention the dangers with which the throne and the “glorious privileges” of the feudal lords were threatened by the French Revolution, and levy followed levy en masse. The feudal lords of the Danube were not even impelled by a feeling of curiosity to think a while of what happened on the Seine. One abbot, Martinovich, and a few others, who pondered over the Declaration of ihe Rights of Men, paid for their curi¬ osity with their lives. No other Hapsburg king of Hungary convoked the States so regularly and at such short intervals as Francis I. did, from the commencement of the Great War to the period when (as the phrase ran), to save Europe, he sacrificed his daughter Maria Louise; and at no other period were the Hungarian nobles more lavish in sacrificing their lives and treasures. In the year 1809 alone 50,000 nobles took the field, and their equip¬ ment entailed an outlay of more than 14,000,000 florins, be¬ sides the armaments of the counties. At the same time Hun¬ gary became inundated with bad coin and paper money, and was made to feel deeply the effects of the Austrian state bank¬ ruptcy. The States then began to approach the throne with loud complaints ; but the close of the Great War led the em¬ peror to choose, for the sake of avoiding useless recrimination, the easy method of altogether discontinuing the holding of the diets. This system was persevered in amid loud manifesta¬ tions of discontent, till the year 1825, when the convening of the States and the exculpatory speech of the monarch again restored harmony between him and his subjects. It is to this date that the reform movement in Hungary, resulting in 1848 in the abolition of feudality, must be traced. The reconcilia¬ tion of the Viennese court, where Prince Metternich, the per¬ sonal friend of the emperor, possessed the greatest influence, Hungary. HUNGARY. 23 to the idea of constitutionalism in Hungary, was no doubt much owing to the unsettled state of Europe, and in particu¬ lar to the war of independence of the Greeks, which reacted on all the Christian provinces of the Ottoman empire. Upon the whole, the diet of 1825 was of a retrospective cha¬ racter, but it remained immovable from the appearance of Count Stephan Szechenyi. The young count, then a captain in a hussar regiment, startled the lords spiritual and temporal, who strictly adhered to the use of Latin, by delivering his speech in the Magyar tongue ; and on that occasion he, more than any other magnate, contributed to the establishment of a Hungarian academy, or learned society, otfering towards this object his income of one year. This diet being ended, he left the army, and boldly assuming the task of a reformer, began to apply himself to political writing. He advocated the re¬ dress of some grievances connected with feudal tenure, reform in the laws relating to credit, and an increase and improve¬ ment of the means of internal communication. The effects produced by his writings were shown in the spirit of the diet of 1832, when earnest appeals were made by the liberals in favour of the peasantry, and when the antiquated privi¬ leges of the nobles began to be called by their right names. A loud cry was also raised on behalf of Poland, then suffering all the horrors of a vanquished people. The results of that diet, however, were futile, although the progress which the idea of reform made in public opinion had by that time be¬ come palpable enough. Next to Szechenyi—engaged with the creation of clubs, the introduction of horse-racing, and plans for the regulation of the rivers, and for railway lines and other public works—the pioneers in the path of progress were Francis Kolesey, the most classical of Hungarian authors; Stephan Bezeredi, who may be styled the Wilberforce of the Hungarian serfs; Francis Deak; Gabriel Klauzal; and Eu¬ gene Bocthy. The last—who, after a stay of a few years in Britain, died in 1854 an exile in Hamburgh—was remarkable for his wit and his extempore harangues, and contributed much to the progress made in matters pertaining to religion. The Viennese court, to intimidate public discussion, resolved to visit a few of the liberals with imprisonment,'—a fate which fell also to the lot of Louis Kossuth. But this arbitrary con¬ duct served only to render more animated the diet of 1840. On this occasion, too, when the question of the liberty of speech came under debate,the voice of Szechenyi made itself be heard with more freedom than that of any other nobleman, unequi¬ vocally stating the difficulty of a true union between constitu¬ tional Hungary and absolute Austria. The noble orator, in hinting to the court of Vienna to abandon its denationalizing measures, exclaimed—“ We may perhaps be murdered, but w e can never be fused into the Austrian dominions ; nay, it is a question whether we can even be murdered—I at least do not believe it.” The results of this diet were also nugatory. Public discussion, however, entered into a new phase, in con¬ sequence of the appearance of the political journal (Pesti- Hirlap) edited by Louis Kossuth. The effects of his leading articles were rapid and unexampled, exciting the attention of the most benighted and most apathetic. At this juncture Szechenyi stepped in to oppose his schemes, in a pamphlet called The People of the East, which served to add to the importance of the Pesti-Hirlap. Another adversary that rose against Kossuth was Count Dessefy Aurel, who became the editor of a conservative journal. Despite the influence of Kossuth’s labours as a journalist, and the stimulus given to public opinion by the liberal ten¬ dency of the literature, then in its most flourishing state, all that the diet of 1843 accomplished was an enactment confer¬ ring on the serfs the right to purchase their complete inde¬ pendence by paying a sum equivalent to the value of the land they possessed. Marriages between Roman Catholics and Protestants, solemnized by Protestant clergymen, were de¬ clared to be legal, and provision was made for enabling Roman Catholics to make a legal transfer of their profession from the Popish to a Protestant creed. With reference to the use of the native idiom, or the Mag¬ yar, it was enacted,—ls£, That it shall henceforth supersede the Latin in the speeches from and the addresses to the throne ; 2d, That it should be used in the central courts of administra¬ tion and in the public schools, as well as in the diet. Croatia was exempted from the general rule, and left free to use Latin as its own tongue in the courts and assemblies. With regard to the diet, however, the Croatian members were exempted Hungary, from using the Hungarian language only for the term of the ^ next six years. Howrever reasonable it was to substitute in the dietal debates a living idiom for the Latin, and however true it was that no other idiom except the Hungarian or Magyar could have been made the parliamentary or diplomatic language, these measures gave rise to a feeling of animosity in Croatia, which produced melancholy results. The question that was followed by a complete failure in the diet of 1843, was that which related to the commercial interest of Hungary. Hungarian commerce having long been obstructed by toll and custom duties established between Hungary and Austria, the liberal party now determined to remedy the evil by a radical change. In this their efforts proved unavailing, though an experiment was afterwards made to encourage home industry by way of association,—an idea conceived by Kossuth, and readily supported by Count Casmir Batthanyi. Meanwhile a new step of the court of Vienna served greatly to increase the political excitement of the country. As observed in the proper place, the counties which alone were able to withstand the en¬ croachments of the Viennese court were governed by sheriffs, nominated by election for the term of three years,while the no¬ minal head of each county was the lord-lieutenant—a dignity, in some instances a hereditary privilege of some families, but in the main conferred by the crown, and anything but lucrative. To render ineffectual the passive resistance of the county muni¬ cipalities, Metternich hit upon the scheme of introducing a new class of officials, called administrators, both in counties where the office of lord-lieutenantcy was vacant, and in some in¬ stances despite the actual lord-lieutenant. This measure alarmed all who wrere in favour of constitutional government. The county assemblies and the daily press echoed with this question, and the liberals were soon split into two parties. The Kossuth party urged the re-affirmation of the county in¬ stitutions, while a newer party, called the centralists, insisted on the nomination of a responsible ministry. The leaders of the latter party were Baron Oetvbs, Ladislaus Szalay, who followed Kossuth in the editing of the Pesti-Hirlap, and af¬ terwards also M. Szcmere, who in 1848 became minister of home affairs. On the approach of the elections for the diet of 1847, both liberal parties coalesced, having published their political creed in a programme. In this important document, in declaring that they will avail themselves of all the means allowable to an opposition in a con¬ stitutional country, the liberals laid down the following points, to carry out which they promised to devote all their energies at the next session:—1. Reform in the feudal system. 2. The due representation of the towns. 3. Equality before the law. 4. General taxation for all classes, nobles and commoners. 5. Publicity in the courts. 6. The reunion of Transylvania with the mother country. 7. Liberty of the press ; and, finally, a responsible ministry. They particularly appealed in this document to the laws of 1790, sanctioned by Leopold II., which distinctly declare that in its administration Hungary is an independent country, having nothing in common with the laws and institutions of the other parts composing the Austrian empire ; and declared, moreover, that, while thus striving after reform, they by no means intended to place the interests of Hungary in opposition, to those of the entire monarchy. An additional feature of this programme was the intimation, that, had the hereditary provinces of Austria continued to enjoy their former liberties, or, if a constitutional existence were granted to those provinces, then there would be no difficulty whatever in reconciling the interests of Hungary with those of the whole monarchy. On the ilth of November 1847 the diet was opened by King Ferdinand V. in person, the business having, according to usage, commenced with debates on the proposals of the crown. The first duty was the election of a palatine in the person of the Archduke Stephan, who was appointed to the office. In the address to the throne, particular stress was laid, along with the mention of other gravamina or grievances, on the recent change introduced into the county administration. The final solution of the reform questions, especially opposed by the upper table or the House of Lords, was quickened by the un¬ expected February revolution of Paris. A numerous deputa¬ tion conveyed the demands of the diet to Vienna. The troubled state of Lombardo-Venetia, and the revolutionary aspect of the capital, followed by the flight of Metternich, allowed the 24 HUNGARY. Hungary, court but short time for equivocation ; and Count Louis Bat- thanyi, who had latterly served the cause of reform, was entrusted by his majesty with the formation of a Hungarian responsible ministry. Its members were :—Home atfairs, M. Szemere ; foreign affairs, Prince Paul Esterhazy ; finance, Kossuth; justice, Leak ; public works, Count Szechenyi; pub¬ lic instruction, Baron Oetvos; commerce, Klauzal; and war, Meszaras, then colonel in the army of Radetzky in Italy. The principal laws passed were,—The abolition of feudality ; gene¬ ral taxation for all classes ; the extension of the franchise to commoners, including also those occupying the military fron¬ tiers ; the equality of all received religions, including the Uni¬ tarians ; the reunion of Transylvania with the mother country ; liberty of the press ; and trial by jury. On the 11th of April King Ferdinand repaired to Presburg, and closed the diet amid the enthusiastic acclamations of the people. As it afterwards became manifest, the court of Vienna, far from readily acquiescing in these reforms, rather meant them as a bait for drawing large supplies from Hungary against the Italian provinces, having immediately conceived the unenvi¬ able idea of preventing the consolidation of the new state of affairs by fanning internal discord. This was easily accom¬ plished. The Rascians, who chiefly inhabit the Banat, and the Croats, demanded separate rights and separate administra¬ tion, and instantly commenced to arm. The Rascians, who first unsheathed the sword of civil war, and many of whom were military borderers inured to arms, soon gained the as¬ cendancy over the Magyars and Germans that inhabited the same districts, while their large supplies of arms and ammuni¬ tion clearly indicated that they were receiving external assist¬ ance. Nor was it long before it became evident that Austrian officers were in their camps, directing their plans of attack. This state of things could not but hasten a collision between the Hungarian ministry and the court of Vienna with regard to a most sensitive question,—the army,—the former having ne¬ cessarily urged the recall of the Hungarian regiments. With¬ out complying with this demand, the Viennese court—which as yet feigned surprise at what happened in Southern Hungary, and stigmatized the Rascians and Croats as rebels—placed at the disposal of the Hungarian ministry a few foreign regiments, the commanders of which were soon found to be acting accord¬ ing to secret orders. The ranks of the Rascians were also swelled by levies openly made in Servia by the Austrian con¬ sul. While the Banat was thus all but a smouldering flame, Transylvania was becoming the theatre of a no less savage conflict. The Wallachs, that fine but neglected race, inflamed against their former feudal lords, and furnished with arms, destroyed Magyars, and everything that belonged to Magyars, with indiscriminate fury. The Saxons, flattered with hopes of great separate privileges, though preferring to keep within the walls of their towns, likewise contributed to the carnage; and, in addition to this general distress, Baron Jellaehich (lately nominated Ban of Croatia) undisguisedly prepared an expe¬ dition against Pesth. The ministers turned to the fountain of justice, and King Ferdinand readily issued proclamations ad¬ monishing the “ rebels ” to peace and obedience; while the “rebels,” in strange mockery, were boasting at that very mo¬ ment of fighting for the king and his throne. Amid this slaughter and devastation, the court of Vienna, directing its conduct in Hungary according to the state of the war in Lombardo-Venetia, went a step further in its dis¬ simulation. The diet was convoked at Pesth with the avowed object of providing for the defence of the country (July 5). In the speech from the throne, the palatine, who opened the diet as vice-regent, declared the determination of the king to pro¬ tect the integrity of the Hungarian throne. The secret ob¬ ject in view of the imperial dynasty in convoking the diet, as it appeared, was to obtain fresh levies for Italy, an idea sufficiently extravagant. The parliamentary deliberations on that head were however cut short by the approach of the Ban Jellachich. Count Batthanyi resigned, and Kossuth determined to proceed to the country and" call the people to arms. The terror of the Croatian invasion soon proved a farce. Having advanced till within 25 miles from Pesth, the Ban was defeated in an engagement which took place at Paakozd, and fled toward the Austrian frontiers during a three days’ armistice that was granted to him. A few days afterwards, his rear, consisting of 10,000 men, was compelled to a surrender. The court now prepared for a regular in¬ vasion of Hungary, while the diet was equipping the levy of Hungary. 200,000 men formerly decreed, and from which decree royal v -l - sanction had been withheld. Meanwhile a dynastic revolution was accomplished. The weak Ferdinand was made to resign and to give place to his cousin, the Archduke Francis Joseph, son of Francis Charles, the heir-apparent to the throne. The new emperor proclaimed his ascension in a manifesto, announcing, among the primary things, the reduction of Hungary, while at. the same time the diet declared this dynastic change uncon¬ stitutional and illegal. The real intentions of the court had been shortly before divulged by the interception of the cor¬ respondence of Count Latour, the Austrian minister of war, and the seizure of the papers of the palatine, who had fled to Vienna when he was supposed to be repairing to the camp to take the lead of the Hungarian troops. Having dispersed a Slavonic congress held at Prague, and reduced the capital to obedience, Prince Windischgratz, joined by the troops of the ban, began marching against Pesth. A part of the Hungarian national army, or the Honveds, which opposed his progress, were commanded by Gorgei, lately a subaltern officer in the Austrian army. Without meeting much opposition, the Austrians advanced, in the beginning of 1849, to the vicinity of Pesth, which they occupied, after the diet and the committee of public defence had determined to transfer their seat to Debreczin, a town situated on the upper side of the Theiss. The heavy falls of snow, the se¬ verity of the season, the badness of the roads, naturally en¬ joined on the Austrian commander the necessity of a short respite, and during that interval the national government gained time for effecting a concentration of troops, and for procuring the materiel of war. With regard to the latter, the efforts and inventive powers of Kossuth surpassed every expectation. On the advance of the Austrians in February 1849, the first engagement which took place at Kapolna proved decisive for neither party ; but, a few days afterwards, a Hungarian corps, withdrawn from the Lower Danube, and commanded by Damyanics, one of the most valiant of officers, routed the Austrians at Szolnok. In the meantime, the Gorgei corps, which, at the taking of Pesth by the Austrians, made a flank movement to the north, made its way amid numerous priva¬ tions and difficulties through the Carpathians to join the army on the Theiss ; while in Transylvania the war entered into quite a new phasis. After the Hungarians, led by the intre- 'pid Bern, a general known as a Polish hero since 1830, had defeated both the Austrians commanded by General Puchner, and the Wallachs, application was made to Russia, and Ge¬ neral Luders, the Russian commander in the Danubian Principalities, forthwith penetrated into Transylvania, occu¬ pying Hermanstadt and Cronstadt, two towns inhabited by the Saxons. Even this foreign aid proved ineffectual. The victorious national legions led by Bern, took Hermanstadt by storm, and compelled both the Russians and Austrians to seek safety in the territories of the Porte. By this time a large national army was ready on the Theiss to commence the offensive against Windischgratz. The com¬ mand was given to Gorgei, and the different corps were led by Damyanics, Klapka, and Aulich. After crossing the Theiss, the Hungarians, in a high pitch of enthusiasm, advanced on the road leading to Pesth, meeting with the first serious resistance at the mountains of Godold. After an obstinate battle the Austrians were driven from their positions, and successively defeated in four other pitched battles, the bloodiest of which was that of Isaszeg, fought on the 6th of April. Windischgratz, abandoning the capital to the rebels, hastened to recross the Danube, leaving behind a small garrison at Buda. Amid these victories, Kossuth, the president of the commit¬ tee of public safety, proposed in the diet the dethronement of the Hapsburg dynasty, and the proposal was carried by accla¬ mation. Hatred to the Austrian dynasty was much increased, both in consequence of its having called in the Russians, and by the new constitution promulgated (March 4) by the emperor Francis Joseph, which made & tabula rasa of all the ancient laws of Hungary. The substance of the act of independence, passed on the 14th of April, runs to the following effect:—That the House of Hapsburg having treacherously levied war against the nation, broken up the integrity of the kingdom, and called in the aid of a foreign power to accomplish its aims, has by HUNGARY. 25 Hungary. these facts destroyed all the treaties that bound it to Hungary, and is therefore declared for ever excluded from the throne of the Hungarian kingdom. The future form of government was to be fixed afterwards, and in the meantime Kossuth was no¬ minated governor, and a new responsible ministry formed. The legislators at Debreczin little suspected that that very moment couriers between Vienna and Petersburg were pre¬ paring a second Russian invasion, and that Europe would raise no voice against such an act. The English and French go¬ vernments refused even to admit into their presence the Hun¬ garian envoys. Though the warlike preparations of Russia were now immense, the Hungarians, under Damyanics, gained (April 18) the battle of Nagy Sarlo, which, if followed up, would have placed in their hands the Austrian capital, and thus have rendered them secure against Russian power. The commander- in-chief, Gorgei, however, instead of advancing, led the army back to Buda, which, after a three weeks’ siege, was taken by assault on the 21st of May; the divisions of Generals Nagy and Kmety having been the first to scale the ram¬ parts. The Russians meanwhile concentrated their forces in Poland, while the Hungarian government, not to ofi'end European diplomacy, proved its forbearance, by refusing to order the corps of observation in the north to advance into Galicia, and thus anticipate the Russian invasion. Neither Russia nor the Western powers showed any sense of this mo¬ deration. The Russians, commanded by Paskiewitsch, began to pour in upon the Hungarian territory in June. As is evident from the official Russian statement, Paskiewitsch’s army consisted of 168 battalions of infantry, 138 squadrons of cavalry, besides 52 of Cossacks ; with 68 generals, 359 staff officers, and 528 guns. The army commanded by Luders, which invaded Transylva¬ nia, numbered 28 infantry battalions, 16 squadrons of cavalry, 18 of Cossacks, with 56 guns ; 11 generals, and 58 staff officers. The whole invading army thus amounted to upwards of 200,000 men. The Austrians were now placed under the com¬ mand of Haynau, who was at Presburg, joined by a Russian corps under General Panutin. The fact alone, that no pro¬ test was made, no word raised against the Russian invasion, served greatly to discourage both the people and the national troops. The combined armies of the two emperors reaped no small advantages from the refractoriness of Gorgei, who, jea¬ lous of his comrades, prevented a speedy concentration of the troops. Obliged for the second time to abandon the capital, the diet and government repaired now to Szegedin, a town situated on the Theiss. After occupying Pesth, Haynau and the Russian corps joined to his army advanced towards the new seat of the diet; and at the same time the main body of the Russians advanced in two columns upon Miskolcz and Debreczin, The diet then transferred its seat to Arad, the fortress of which, like Comorn and Petervardein, wTas in the hands of the nation, and now the great struggle was drawing to its melancholy close. In Transylvania, the army under Bern was finally overpowered and routed ; and in H ungary, Haynau and the Russian corps first drove the Hungarians, commanded by Dembensky, from their position at Szegedin, and then gained a signal victory near Temesvar (August 9). It was two days after this latter defeat that Gdrgei, after a flank movement, undertaken at his own suggestion, arrived at Arad, where a pitched battle was to have been fought with concentrated forces ; but this plan was naturally much affected by the defeat of Temesvar. At this juncture Kossuth resigned (August 11), having, in concert with those ministers that were present, nominated Gorgei dictator of Hungary, and soon after¬ wards left Arad. The new dictator, who for some time back had been negotiating with the Russians, no sooner entered upon his office, than he at once settled with the Russian commander-in-chief the conditions of a surrender. This was soon accomplished on the 13th of August at Vilagos, a place near Arad ; 24,000 men laid down their arms, and delivered 140 guns to the Russian General Rudiger. Bodies of troops that were in the immediate vicinity were compelled to do the same, and the fortress of Arad also opened its gates to the Hungary. Russians. The belief of many among the Hungarian army, it may be observed, was, that the Grand Duke Constantine was to be the king of Hungary, and that he promised to give a constitution. A few thousand men followed Bern and Guyon to Turkey, whither Kossuth and several others of the principal leaders had retreated, while all the prisoners of war were delivered by the Russians to General Haynau; and by the 2d of October the last rock of hope disappeared in the capitulation of Co- morn, governed by General Klapka. “ Hungary jay now en¬ tirely prostrate. The Russians began to take their backward route to the north and east, the Servians returned to the south, only the Austrians remaining with their commander Haynau, surrounded by bloody tribunals and hangmen. In almost every town of importance sat these foreign judges, to whom Francis Joseph confided the complete pacification of Hungary. Arad and Pesth, however, were the centres of these judicial proceedings. By an inexorable decree of Hay¬ nau, all the officers below the rank of a general, if not con¬ signed to prison, were pressed as privates into the Austrian service, while the generals were sentenced to perish by the rope.” The following eleven generals perished on the gal¬ lows at Arad on the 6th of October :—Kiss, Torok, Aulich, Lahner, Schweidel, Lemingen, Yecsey, Knezich, Nagy Sander, and Damyanics. The last, the Hector of the Hungarian army, was dragged to the scaffold, despite his fractured leg. On the same day were executed at Pesth with the bullet, Count Louis Batthanyi, Baron Prenyi, and several others, whose memory is endeared to the nation. Despite the fact, that the constitution promulgated by the emperor in March 1849, meant to give equal rights to all the parts of the monarchy, was subsequently declared inappli¬ cable, the new regime in Hungary was based on the ruins of all the ancient institutions. The office of the palatine, the county municipalities, the rights and privileges of the Protes¬ tant churches, all were swept away by periodical organic laws or ordinances. A treacherous hand dug up the crown of St Stephan, to deliver it to the emperor. But Francis Joseph, too glad of its possession, hitherto declined to undergo the ceremonies of coronation. From a kingdom, Hungary thus sunk into a province, broken up into three parts, viz., two crown lands (the whole empire being divided into 20 crown lands), and a vayvodship. This latter province, comprising the Banat, consists of the counties Bacs, Krasso, Temes, To- rontal, and part of Syrmia. The three Croatian counties, Agram, Kreutz, and Yarasdin, and the three Sclavonian coun¬ ties, Posega, Verdze, and Syrmia, along with the Hungarian littorale, were erected into a crown land ; the rest of the king¬ dom, divided into six districts, forms the other crown land. Transylvania is divided into five districts. That the people feel the loss of their political rights, and look with anything but contentment upon the tabula rasa, feeding a host of foreign officials, and the infinitely less plea¬ sant secret spies, may easily be understood. The exorbitant taxes which have already ruined part of the county gentle¬ men, however, would alone suffice to keep up those feelings which the court of Vienna flatters itself have disappeared. It is no secret, that the 119 million florins which Hungary con¬ tributed in 1854, to the well-known voluntary loan of 500 million, was, in the proper sense, a compulsory tax, levied with the voice of command and intimidation. As if willing still more to brave the feelings of Hungary, the emperor surren¬ dered to the pope the privileges of the Hungarian king by the concordat concluded in August 1855. The progress that is being made in the improvement of the means of communica¬ tion, and the reforms introduced in several departments of judicature, are advantages well worth mentioning. Nor ought it to be forgotten, that, however violent the changes intro¬ duced, and however at the mercy of a few civil and military officials, Hungary remains in possession of the noblest act of the revolution—the liberation of the serfs. (e. s—d.) YOL. XII. D 26 HUN Hungary- Hungary- Water, a distilled water prepared from the Water t0pS 0f flowers of rosemary, and so denominated from a TT II queen of Hungary, for whose use it was first made. John1’’ HUNGER. See Dietetics, and Physiology. V • HUNGERFORD, a market-town of England, Berk- ” shire, on the Kennet, 27 miles W.S.W. of Reading. It consists chiefly of one long street, in the centre of which stands the market-house. It has no manufactures of im¬ portance, but carries on a considerable trade in agricultural produce, by means of the Kennet and Avon Canal. It is also connected, by a branch, with the Great Western Rail¬ way. There is a free grammar school in the town. Market-day, Wednesday. Pop. (1851) 2255. HUNNI, or Chuni, in English, Huns, the collective name of several nomadic Scythian tribes, who contributed powerfully to the overthrow of the Roman empire of the West in the first half of the fifth century. Their early history is very obscure. They seem to have belonged un¬ doubtedly to the Mongolian family, and their habits, ap¬ pearance, and physical characteristics, as described by their contemporaries, confirm the idea. The great plains of Tartary, on the confines of China, are assigned as the cradle of the race, which, long before the Christian Era, had grown strong enough to keep its neighbours in constant alarm. The Chinese, who had suffered particularly, are said to have built the Great Wall (about 200 b,c.) to secure themselves from their incessant attacks. Driven back on this side, the Huns now directed their course to the West, and about the middle of the fourth century are found settled in the country lying between the Caspian Sea and the River Dniester. For about sixty years from this date they were chiefly occupied in defending their new settlements from the attacks of the neighbouring tribes. The most formidable of these, the Alani, a tribe of kindred blood to the Huns themselves, were, after many sanguinary contests, nearly annihilated. Such of them as survived the war were incorporated with the conquerors. About the year 376, the Huns, pursuing their westward course, attacked the Gothic tribes on the northern side of the Danube. The Visigoths, to the number of 200,000, took refuge in the Ro¬ man territories, where lands were allotted to them ; and the Gruthungi, or Ostrogoths, soon followed their example. Reinforcing their ranks from the other hordes that joined them, and for a time making common cause with the Goths, the Huns next attacked the Romans, and, in a great battle near Adrianople, slew the emperor Valens. Their power continued steadily to increase till about the middle of the fifth century, when it culminated under Attila. (See Attila, and Roman History.) After his death, the various tribes which his genius had amalgamated into one people became broken up and dispersed, and, being attacked in detail by the Goths, who hated and feared them as much as the Romans did, they were driven back across the Don. Some of them settled in Pannonia, and left an enduring trace of their presence in the name of the country now called Hungary. A branch of the Hun family, known as the Nephthalitae or White Huns (whose physical characteristics were in many respects different from those of the Huns Proper), are found invading Persia in the reign of Firoze, but before the middle of the sixth century they cease to be mentioned in history, and were practically extinct. (See Ammianus Marcellinus; Priscus; Gibbon; De Guignes’ Histoire des Huns ; Neumann’s Die Volker des Siidichen Russlands ; and R. G. Latham in Smith’s Diet, of Geog.) HUNTER, John, an eminent surgeon, naturalist, and anatomist, the brother of Dr William Hunter, was the youngest son of John Hunter, a Scottish yeoman, and born aboutFebruary 14,1728, at Long Calderwood, a small family estate in the parish of Kilbride East, county of Lanark. His mother was the daughter of a citizen of Glasgow, HUN named Paul, who held the office of treasurer of the corpo¬ ration. His father died when he was ten years of age, and being, in consequence, left much to his own guidance, he preferred country sports and occupations to literary pur¬ suits. He had a brother-in-law, a cabinetmaker in Glas¬ gow, named Buchanan, who had married his sister Agnes; and when about seventeen years of age he went to Glas- gpw, and stayed with Buchanan with the hope of being able to assist in freeing him from the pecuniary difficulties into which his convivial habits and inattention to business had led him. It is probable that it was here, as a cabinet¬ maker, that he acquired some of the manual dexterity he afterwards displayed, and it was this visit which probably gave origin to the statement of his biographer Foot, that he had served an apprenticeship to a millwright or carpenter. When in his twentieth year John Hunter went to Lon¬ don to join his brother William, He was struck while at Glasgow by the report of his brother’s success, and receiv¬ ing a cordial invitation to join him, he set off on horseback in September 1748. His anatomical dexterity satisfied his brother, who employed him in his dissecting-room during the following winter session, and obtained leave for him to attend the practice at the Chelsea Hospital, under Cheselden, during the following summer. Chesel- den was now more than sixty years of age, and had retired in a great degree from professional life, with the highest professional honours. It was under this great surgeon that John Hunter received his first instruction in surgery. He continued to attend regularly at Chelsea during the sum¬ mers of 1749 and 1750, but in the following year Chesel¬ den was obliged to withdraw from his duties in consequence of an attack of paralysis, and Hunter entered as surgeon’s pupil, under Pott, at St Bartholomew’s. John Hunter was now a medical student, and seems to have been under little restraint as to his general conduct. He was known by the convivial and low associates with whom he mixed as “ Jack Hunter,” a nick-name he never wholly lost.. He was employed by his brother to provide subjects for the dissecting-room, and became intimate with the bold, dissolute class of men who stole bodies from the grave, and known under the cant phrase of “ resurrection- men.” One of the amusements in which he took particular pleasure was to mingle with the rabble in the shilling gal¬ lery of the theatres, for the purpose of assisting to damn the productions placed on the stage—an office in which he is said to have displayed peculiar tact and vigour. This taint of coarseness and vulgarity was never eradicated dur¬ ing his subsequent life. In the summer of 1752, John Hunter went into Scot¬ land, and brought back his sister, Mrs Buchanan, now a widow; and in 1753 he was entered as gentleman com¬ moner at St Mary’s, Oxford. This attempt on the part of his brother William to elevate and refine his mind was un¬ successful, for in speaking of the circumstance afterwards to Sir Anthony Carlisle, when the latter was a student, he said, “ They wanted to make an old woman of me ; or that I should stuff Latin and Greek at the university; but,” added he, significantly pressing his thumb-nail on the table, “ these schemes I cracked like so many vermin, as they came before me.” Having decided upon being a surgeon, John Hunter entered, in 1754, as surgeon’s pupil at St George’s Hospi¬ tal, and continued to follow the plan of assisting in the dis¬ secting-room during the winter session, and attending hos¬ pital practice during the summer. Two years afterwards he served the office of house-surgeon to the hospital, the duties of which are such as particularly give the holder an insight into practical surgery. In May 1754, John Hunter made the dissection upon which he laid claim to the discovery of the mode of con¬ nection between the uterus and placenta. Dr Mackenzie, Hunter, John. , ' HUNTER. Hunter, then an assistant with Dr Smellie, had been very success- John. ful in injecting the arteries and veins of the uterus in a woman who had died pregnant, and applied to John Hun¬ ter for his assistance in dissecting it. This he rendered, made anatomical preparations of the parts, and showed the results to his brother William, who at first doubted his in¬ ferences, but afterwards acknowledged their accuracy. Twenty years afterwards, when Dr Hunter published his work on the Anatomy of the Human Gravid Uterus, he gave no special credit to his brother John for the discovery, an omission which led to a quarrel and entire severance of their friendship. In the year 1755 John Hunter entered into partnership with his brother in the anatomical school, and had to de¬ liver a proportion of the lectures. He was not, however, qualified for this position, for he had always great difficulty in speaking extempore, an acquirement absolutely essential to success in a teacher of anatomy. Hence, notwithstand¬ ing his thorough knowledge of his subject, he never gained a popular style. He now turned his mind to anatomical research in conjunction with his brother, and engaged with him in those disputes as to priority of discovery which con¬ stantly arise from time to time amongst scientific investi¬ gators. William carried on the warfare with his pen while John worked with the scalpel. Two of these disputes were with the Monros—one, as to the first successful conjecture of the tubuli testis with mercury, the other as to the func¬ tions of the lymphatics. It is generally allowed that as to the latter the doctrine of the two Hunters was the correct doctrine. Another dispute was with the great surgeon Pott, whom William Hunter accused of stealing, without acknowledgment, from himself and his brother the anatomy of congenital hernia. Pott denied the accusation ; but, in fact, Haller had already anticipated the Hunters. In one particular point of the subject the credit of priority is due to John Hunter, for he was undoubtedly the first to ex¬ plain the cause and mode of descent of the testis in the foetus. About this time John Hunter traced the anatomy of the first pair of nerves within his nose. He subsequently pub¬ lished engravings in his Animal Economy, executed from his anatomical preparations of the parts. In 1758 he com¬ pleted a series of experiments, instituted with the object of determining the accuracy of the doctrine that the veins are the only absorbents, and came to the conclusion that ab¬ sorption was carried on through the lymphatics and lacteals exclusively. Modern research has shown that both are ab¬ sorbents in the vertebrata, but that in the invertebrata no lacteals exist, and absorption takes place through the blood¬ vessels. After having studied human anatomy for ten years, John Hunter began the pursuit of comparative anatomy, and it was therefore at this period of his life he laid the foundation of his future distinction. His health, however, had began to suffer, and in the spring of 1759 an attack of inflamma¬ tion of the lungs ended in a state of health which threatened pulmonary disease of a phthisical character. It was, there¬ fore, thought necessary that he should leave London, and seek a more genial climate. With this object in view, he applied to Adair, the Inspector-General of Hospitals, for a medical appointment in the army, who immediately made him a staff-surgeon. John Hunter embarked early in 1761 with the armament sent to lay siege to Belleisle, during which, although short, he had ample opportunities for treat¬ ing gun-shot wounds. In 1762 he proceeded to Portugal, where he remained till the end of the year. In 1763 peace was proclaimed, and John Hunter was put on half-pay. While with the army, John Hunter studied comparative anatomy and physiology. He made experiments on lizards and snakes to ascertain whether digestion was carried on during hybernation, and he instituted inquiries into the fa- 27 culty of hearing in fishes. It was during these campaigns Hunter, that he made the greater number of his observations on John, gun-shot wounds, and that many of his peculiar views on inflammation were suggested. Hewson had succeeded John Hunter in the anatomical school; so that the latter had to decide upon his course of life when he returned to London on half-pay. He deter¬ mined to commence practice there as a surgeon, and en¬ tered into competition with Pott, Sir Caesar Hawkins, Bromfield, Samuel Sharp, and Warner. Although his natural talents and professional knowledge were much in his favour, he laboured under a great disadvantage in his want of gentlemanly bearing and tact. “ The stone had need be rich that is set without foil,” is a remark of the great father of the inductive philosophy. It was long, therefore, before John Hunter obtained a large share of practice. As a means of increasing his income he com¬ menced to give lectures on anatomy and surgery to a pri¬ vate class; but so far were his views and talents from ex¬ citing the attention he might have reasonably expected, his hearers never numbered twenty. John Hunter occupied this period of forced leisure from the labours of professional life by unremitting researches into comparative anatomy. He got the carcases of animals from the Tower or from itinerant zoological collections, and would purchase rare animals for these menageries on the condition that when they died the dead body was to be re¬ stored to him. Sir Everard Home used to state that as soon as he had accumulated fees to the amount of ten guineas, he always purchased some addition to his collec¬ tion. Indeed, he was sometimes quite ready to borrow from his friends when his own cash was run out, and the temptation great;—“ Pray, George,” said he one day to Nicol the bookseller, with whom he was very intimate, “ have you got any money in your pocket?” Nicol replied in the affirmative. “ Have you got five guineas ? because, if you have, and will lend it to me, you shall go halves.” “ Halves in what?” inquired his friend. “Why halves in a magnificent tiger, which is now dying in Castle Street.” Nicol lent the money, and John Hunter got the tiger. John LIunter had by this time fully entered into the great business of his life, namely, the building up of human physiology and pathology from the sure foundations of natu¬ ral history and comparative anatomy, and he pursued it with characteristic energy and enthusiasm. As many of the inquir¬ ies and experiments he wished to make were impracticable in a town, he purchased a piece of ground at Brompton, called Earl’s Court, and built a small house on it. Here he had a menagerie, and here he pursued most of the researches which were communicated to the Royal Society, or published in his work on the Animal Economy. It was his greatest pleasure to attack the animals playfully, and excite them to put into action their various instinctive methods of self-de¬ fence. On one of these occasions, a little bull, which the queen had given to him, and with which he had been wrest¬ ling, threw him down, and would have injured him seriously, if one of his servants had not come to his rescue. He had also an awkward adventure with two leopards which had broken their chains, and got amongst the dogs. The ani¬ mals had a fierce encounter, and Hunter hastened to separ¬ ate them by leading the two leopards back to their den. When the danger was over, he became so agitated at the recollection of it, that he fainted. In 1767 John Hunter was elected a fellow of the Royal Society, before his brother William, who had been ten years longer in London. In this year he ruptured his tendo Achillis while dancing. In 1768 he was appointed to the office of surgeon to St George’s Hospital, and soon after be¬ came a member of the Corporation of Surgeons. He now began to take pupils, having with each a fee of 500 guineas. Jenner, in 1770, was one of these; but all his pupils were HUNTER. 28 Hunter, distinguished in their profession. Hunter subsequently kept John. Up an intimate correspondence with Jenner at Berkeley, with wdiom he had a community of pursuits in the study of na¬ tural history. Anything curious “ either in the fish or flesh way” was always acceptable from Jenner, who forwarded to him hedge-hogs, fossils, salmon-spawn, bats, a porpesse, crows’ nests, and the like. In May 1771 Hunter published the first part of his Treatise on the Teeth ; the second part did not appear until 1778. In 1771 he was married to Miss Home, the daughter of a surgeon in the army. Her brother Everard was Hun¬ ter’s pupil, and was subsequently made a baronet. In 1772 he communicated to the Royal Society the results of his ob¬ servations on the post mortem digestion of the stomach by the gastric juice. In the spring of 1773 he had an alarm¬ ing attack of spasm—the first indication of that disease of the heart which was ultimately fatal. It seemed to have been closely connected with his gouty predisposition, and to have been immediately induced by severe mental emotion. In the autumn of the same year, he commenced his first dis¬ tinct course of lectures on surgery. To him lecturing was so irksome a task, that he never commenced his course without taking laudanum to relieve his uneasy sensations ; yet he continued the practice for many years. His Re¬ searches on the Torpedo were published this year. In 1774 two of his papers were published in the Transactions of the Royal Society; one on the air-receptacles of birds, the other on the stomach of the gillaroo trout. His professional success was now sure, but this year was the first in which his income exceeded L.1000. All this time his museum had been enlarging, and his opportunities for research extend¬ ing, until it was necessary to have special help. He, there¬ fore, engaged Mr Bell for ten years as his assistant, but he ultimately remained with him fourteen. In 1775 Hunter entertained thoughts of founding a School of Natural History, and sought the co-operation of Jenner, premising that it was necessary that the latter should be “able and willing to lay down 1000 guineas.” Jenner declined, and the project fell through. In this year he com¬ municated to the Royal Society a paper on the heat of animals and vegetables. The appointment of surgeon-extraordinary to the king was conferred upon John Hunter in 1776. In the course of the same year, he drewr up, at the request of the Royal Humane Society, a memoir on the means to be employed in the recovery of drowned persons, which was published in the Philosophical Transactions. He also commenced this year a series of six Croonian lectures on muscular motion. In the spring of 1777, Hunter was attacked with a cere¬ bral affection, characterized by constant vertigo and morbid acuteness of the organs of sense ; and in the autumn of the same year he went to Bath for three months for the benefit of his health. Jenner saw him there, and his diagnosis of Hunter’s disease was, that it was angina pectoris, a serious and very painful affection of the heart. In 1778 he presented to the Royal Society his second memoir on the heat of vegetables and animals, and in 1779 his memoir on the hermaphrodite black cattle, orfree-mar- tin. In 1780 he sent to the same society a paper on the structure of the placenta, in which he claimed for him¬ self the discovery of the true mode of union between the uterus and that organ. Five years previously, William Hunter had claimed the same discovery in his work on the Gravid Uterus, and it could hardly be expected that he would allow John’s claim to pass uncontradicted. The re¬ sult of the affair was a complete estrangement on the part of the two brothers. Three years after this, when William was on his death-bed, John requested permission to see him, which was granted, and he continued to attend him until his death, and occasionally passing the catheter for him. In March 1781 Hunter appeared as a witness in the cele¬ brated trial of Captain Donellan for the murder of his bro- Hunter, ther-in-law, Sir Theodosius Boughton. In the same year John, he was elected a fellow of the Royal Society of Belles Let- tres at Gottenberg. In 1782 he completed his Croonian lectures. In 1783 he was elected a member of the Royal Academy of Surgery and the Royal Society of Medicine at Paris. In the same year he began to build his museum in Leicester Square, which was not completed until 1785. He also, in conjunction with Dr Fordyce and others, took an active part in 1783 in establishing the “ Society for the Improvement of Medical and Chirurgical Knowledge.” His paper on inflammation of the veins was published in the first volume of the Transactions of this society. In 1785 his cardiac affection assumed a new form, com¬ ing on in spring after the cessation of some slight symp¬ toms of gout, and continuing to recur paroxysmally during the rest of his life, whenever he had any unusual exertion to make or mental anxiety to suffer. He again sought health and rest at Bath. It was after his return that he practised the new method of tying the artery for popliteal aneurism. In 1786 he was appointed deputy-surgeon-general to the army. Early in the same year he published his work on the Venereal Disease,and. towards the close, his Animal Eco¬ nomy, which consisted chiefly of his most important papers from the Philosophical Transactions. In 1787 his me¬ moirs on the specific identity of the wolf, jackal, and dog, and on the structure and economy of whales, were printed in the Philosophical Transactions. In this year, also, he received the Copley Medal from the Royal Society, and was elected a member of the American Philosophical So¬ ciety. He had added in 1783 the skeleton of Byrne or O’Brien, the Irish giant, to his museum, at the cost of five hundred pounds, and, having in all respects completed its arrangements, he threw it open to the public during the months of May and October in each year. In December 1789 Hunter experienced a sudden and entire loss of memory for half an hour, a state of the brain evidently in intimate dependence on the state of the heart. The spasms about the prsecordia were now so readily in¬ duced by any mental excitement that he was accustomed to say his life “ was in the hands of any rascal who chose to annoy and tease him.” In 1792 he contributed his last paper to the Philosophi¬ cal Transactions, being the results of his observations on the hive-bee for twenty years. His fondness for bees was always great, and he had several hives in his conservatory at Earl’s Court. In this year he resigned his lectureship on surgery in favour of his brother-in-law Home, princi¬ pally with the view of completing his treatise on Inflamma¬ tion. He did not live, however, to see the entire work through the press. On the 16th of October 1792, he attended a board meeting at St George’s Hospital, with the view of obtaining a modification of a bye-law recently passed regulating the admission of pupils, in favour of twro of his countrymen just come to London. In the course off his remarks he made some statements which one of his colleagues thought it necessary instantly and flatly to con¬ tradict. Hunter immediately ceased speaking, and hurried into the adjoining room, where he instantly fell lifeless into the arms of Dr Robertson, one of the physicians to the hospital. His body was examined to ascertain the cause of death. The carotid arteries and their branches within the skull were in fact thickened and ossified. The result of his pulmonary attack in 1759 was found in the form of firm adhesions between the left lung and costal pleura; in addition to thickening of the pericardium, the coronary ar¬ teries and tricuspid and mitral valves were much ossified. The aortal valves were also thickened and rigid. John Hun¬ ter died in his sixty-fifth year. His body was interred in the church of St Martin in the Fields. HUN Hunter, Dr In person, John Hunter has been described as about the William, middle stature, of a vigorous and robust frame, with high v'—shoulders and short neck. His features were rather large and strongly marked ; his eyebrows projecting, his eyes of a light colour, his cheeks high, his mouth somewhat under¬ hung. In mental character he was a genius, and one of a family in which talent was hereditary. Joanna Baillie and Dr Baillie were the children of a sister; and, besides his brother William, another brother of the family, whose career was cut short by death, manifested considerable mental talent. He had a large power of induction, acute powers of observation, a vivid and fertile imagination, and unwearied energy. He wanted a natural refinement of feeling; he had never been taught self-control; he had had no literary culture. He was therefore often coarse in his lan¬ guage, violent in his temper, quarrelsome, selfish, and ego¬ tistical. Of religious sentiment he made no profession. John Hunter’s museum was purchased in 1799 by the nation, and placed in the keeping of the College of Surgeons of London. The occasion was seized for securing a new charter for the College, containing the grant of the prefix Royal to its title, and permission to examine for its diplomas. From this event a new era in British surgery may be dated ; and in connection with the name of John Hunter, the “Hun¬ terian Museum” is one of the national institutions. Unfor¬ tunately, in 1812, his brother-in-law (afterwards Sir Everard Home) took away the ten folio volumes of minutes of dissections which John Hunter had left, along with many other valuable papers, without permission being had from the trustees, but with the alleged intention of preparing from them a catalogue of the museum. Time passed on ; no catalogue was forthcoming ; and at last, after repeated inquiries, Home acknowledged that he had burnt the whole, pretending that in doing so he had acted in accordance with the directions of John Hunter. The allegation was altogether incredible ; but another and more probable cause was surmised, namely, that these volumes would, on exami¬ nation, have been found to have supplied the substance of the papers which Sir Everard Home contributed to the Royal Society in greater number than any other single member of that distinguished body had contributed since its foundation. (t. l.) Hunter, Dr William, an eminent anatomist and physi¬ cian, was born on the 23d of May 1718, at Long Calder- wood, in the parish of Kilbride East, county of Lanark, Scotland. He was an elder brother of John Hunter, and the seventh child of the family. His paternal great-grand¬ father was a younger son of Hunter of Hunterston, chief of the family of that name. At the age of fourteen he went to study at the University of Glasgow, where he re¬ mained five years. His father had designed him for the church, but he had an insuperable aversion to theological pursuits, and having the reputation of a good scholar, he sought to obtain the appointment of parochial schoolmaster in his native parish. To his great disappointment he was unsuccessful in his application. At this time, however, he formed an acquaintance with Cullen, afterwards the distin¬ guished professor of Edinburgh, but who was then just established as a medical practitioner at Hamilton, and being thereby induced to enter the medical profession, went in 1737 to reside with him. After remaining with Cullen three years, it was agreed that they should enter into part¬ nership, and Hunter should take the surgical part of the practice. Previously to completing this arrangement, Hun¬ ter was to study in London and Edinburgh, and on his re¬ turn to take the entire charge of the practice, so as to afford Cullen similar advantages. A very different career was, however, marked out for them in the metropolis of the North and of England. In pursuance of the plan laid down, William Hunter attended the lectures given in the medical faculty of the TER. 29 university during the session of 1740-41. Amongst the Hunter, Dr courses was that of Dr Alexander Monro. In the sum- William, mer of 1741 he went to London, and took up his residence ^ at the house of Dr Smellie, then an apothecary in Pall Mall. He brought with him a letter of introduction to Dr James Douglas from Mr Foulis, the famous printer of Glas¬ gow, who had been useful to Hunter in procuring for him different editions of Horace’s works. Douglas was then en¬ gaged on a work on the bones (which, however, he did not live to complete), and was seeking for a suitable person to employ as a dissector. Being pleased with William Hunter, he invited him to enter his family as tutor to his son, and assistant to himself. This invitation was accepted, and at the same time, by Douglas’s friendly assistance, he entered as surgeon’s pupil at St George’s Hospital" under Mr James Wilkie, and as a dissecting pupil under Dr Frank Nichols, who was then one of the best anatomists of the day, and had formerly taught anatomy at Oxford. He likewise attended a course of experimental philosophy, delivered by Desaguliers. Before many months had elapsed William Hunter lost his friend and patron Douglas, who died in 1742, but he still continued to reside in the family, and act as tutor to the son. Before the death of Douglas he had made so much progress in his dissections that the former had had drawings of several of his preparations engraved. In the year following (1743) he communicated to the Royal So¬ ciety an essay on the structure and diseases of articulat¬ ing cartilages. To teach anatomy was now his plan of life, and he therefore began to collect preparations and take other steps to fit himself for the pursuit. It was at this time the foundation of his museum was laid. An opportunity of commencing the teaching of anatomy shortly offered. A society of naval surgeons had an apartment in Covent Garden, where they had engaged Sharpe, the eminent sur¬ geon, to deliver a course of lectures on operative surgery. Sharpe continued to repeat the course until, finding it in¬ convenient, he declined the task in favour of William Hun¬ ter, who gave his hearers so much satisfaction that they engaged him to teach them anatomy. William Hunter’s first anatomical course was delivered to this society in 1746. Mr Watson, one of his earliest pupils, accompanied him home after the trying moment of his introductory discourse. He had just received seventy guineas as admission-fees, which he carried in a bag under liis cloak, and remarked on the way to Watson that it was a larger sum than he had ever before possessed. The pro¬ fits of his two first courses were considerable; but in con¬ sequence of too liberally relieving the wants of some friends, he had not money sufficient to defray the expense of the usual advertisements of the third course, and was obliged to defer the commencement of it for a fortnight. This embarrassment was an impressive lesson to him, and pro¬ bably was one of the remote causes of the large fortune he accumulated. In 1747 he was admitted a member of the Corporation of Surgeons of London ; ’and in the spring of 1748 accom¬ panied his pupil Douglas on a tour through Holland and France, returning in the autumn to commence his usual course of lectures. At Leyden he visited Albinus, whose beautiful injections of the blood-vessels strongly attracted his atten¬ tion, and excited his emulation. In the autumn of this year his brother John came to him. William Hunter at first practised both surgery and midwifery; but, like his patron Douglas, he gave the preference to the latter de¬ partment: consequently, in 1748, he took the appointment of surgeon-accoucher to the Middlesex Hospital, and, in 1749, to the British Lying-in Hospital. In 1750 he seems to have resolved to abandon the practice of surgery alto¬ gether, for in that year he became a graduate of the Uni¬ versity of Glasgow. Previously to this he had left the family of Mrs Douglas, and taken a house in Jermyn Street. 30 HUNTER. Hunter, Dr This was the crisis of William Hunter’s career, and William, fortune aided his first commencement of practice. His rivals were moving away, or unable to compete with him for public favour. Smellie was unpleasing in his person and manners; William Hunter was his equal in acquire¬ ments, his superior in person and deportment. Sir Rich¬ ard Manningham, one of the most eminent accoucheurs of the day, also died about this time; and Dr Sandys, who di¬ vided with him the practice of the fashionable world, retired within a few years to the country. William Hunter sub¬ sequently secured Sandys’ large collection of anatomical preparations by purchase from Mr Bromfield for L.200. In 1751 we find him devoting the whole of his energies to his professional labours and pursuits, and forming plans of great and varied extent and importance. In a letter to Cullen, he says, “ I want to tell you many things about colleges, hospitals, professorships, chariots, wives, &c., &c. I’m busy in forming a plan for being an author. In short, my head is full of—a thousand things.” His plans as to marriage were amongst those which he never completed. In this year he paid his first and only visit to his native country, where he found Cullen established at Glasgow, and in rising reputation both as a practitioner and lecturer, so that the two friends could congratulate each other on their mutual prosperity. In 1752 he demonstrated to his class his method of injecting the testis with mercury. In 1753 he had a long illness—“a strange sort of eruptive fever,” as he describes it in a letter to Cullen. In 1754 he was elected a member of the Medical Society of London, and took his brother John into partnership; and in 1755 he succeeded Dr Layard as physician to the British Lying- in Hospital. In 1756 he was admitted a licentiate of the Royal College of Physicians in London. In 1757 his first contribution to the Medical Observations and Inquiries appeared in the first volume of that work ; it was “ The History of an Aneurism of the Aorta.” Various papers on practical subjects from his pen appear in successive volumes of this work, i.e., in the 2d, a history of an emphysema, and in the 4th, 5th, and 6th essays on varicose and other aneurisms, displacements of the uterus, and malconforma- tions of the heart, the last illustrated by plates. John Hunter having left his brother in 1759 to join the army, the latter engaged that distinguished anatomist, Wil¬ liam Hewson, to take his place both as assistant and part¬ ner. The connexion between the two brothers had not been a happy one; William was irascible—John quarrel¬ some and vulgar. Indeed, the only inducement which led to its continuance on the part of William Hunter were his brother’s extraordinary skill as a dissector, and the valuable contributions he was constantly making to the museum. In 1762 Dr Hunter was consulted by the queen, then pregnant, and on the 12th August he writes to Cullen to announce the birth of the Duke of Cornwall. “ I owe it to you,” he adds, “ and thank you from my heart for the great honour I now have, and have had for some time, though very few know anything of it,—I mean having the sole direction of her majesty’s health, as a child-bearing lady.” Two years afterwards he was appointed physician- extraordinary to the queen. In this year, also, he pub¬ lished the first part of his Medical Commentaries, pro¬ posing that the second should be constituted by his work on the Human Gravid Uterus. In this work he gave a summary ot his controversy with the Monros in 1757— carried on at first in the pages of the Critical Review; and asserted his prior claim to the method of injecting the testis with mercury, and to the discovery of the uses of the lymphatics. He also endeavoured to set himself right as to his controversy with Pott, and defends his brother’s views on congenital hernia. When William Hunter began to practise midwifery, he was desirous of acquiring a fortune sufficient to place him in easy and independent circumstances. Before many Hunter, Dr years had elapsed, he found himself in possession of a sum William, adequate to his wishes in this respect; and this he set apart as a final resource whenever age or infirmities should oblige him to retire from business. As his wealth continued to accumulate, he formed a design of engaging in some scheme of public utility, and at first had it in contemplation to found an anatomical school in the metropolis. For this purpose, about the year 1765, during the administration of Mr Gren¬ ville, he presented a memorial to that minister, in which he requested the grant of a piece of ground in the Mews, for the site of an anatomical theatre. Dr Hunter undertook to expend L.7000 on the building, and to endow a profes¬ sorship of anatomy in perpetuity. This scheme did not meet with the reception it deserved. In a conversation on this subject, which he had soon afterwards with the Earl of Shelburne, his lordship expressed a wish that the plan might be carried into execution by subscription, and very gener¬ ously requested to have his name set down for 1000 guineas. Dr Hunter’s feelings would not allow him to adopt this proposal. He chose rather to execute it at his own expense, and accordingly purchased a spot of ground in Great Windmill Street, where he erected a spacious house, to which, in 1768, he removed from Jermyn Street. In this building, besides a handsome amphitheatre and other convenient apartments for his lectures and dissec¬ tions, there was one magnificent room appropriately fitted up as a museum. The cost of the whole was above L.8000. Of the magnitude and value of his anatomical collection some idea may be formed, when we consider the number of years he employed in making the anatomical prepar¬ ations and in the dissection of morbid bodies, and the eager¬ ness with which he procured additions from the collec¬ tions of Sandys, Hewson, Falconer, Blackall, and others, that were at different times offered for sale in London. His specimens of rare diseases were likewise frequently increased by presents from his medical friends and pupils ; who, when anything of this sort occurred to them, very justly thought they could not dispose of it more properly than by placing it in Dr Hunter’s museum. Speaking of an acquisition in this way in one of his publications, he says, “ I look upon everything of this kind which is given to me, as a present to the public; and consider my¬ self as thereby called upon to serve the public with more diligence.” Before his removal to Windmill Street, his collection chiefly illustrated human and comparative anatomy, and pathology; but now he extended his views to fossils, and to the promotion of classic and polite literature. In a short space of time he became possessed of a most mag¬ nificent collection of Greek and Latin books. A cabinet of ancient medals contributed likewise much to the rich¬ ness of his museum. A description of part of the coins in this collection, struck by the Greek free cities, was after¬ wards published by his friend Mr Combe. In the preface some account is given of the progress of the collection, which had been formed since the year 1770, with singular taste, and at the expense of upwards of L.20,000. In 1781, the museum received a valuable addition of shells, corals, and other illustrations of natural history, which had been collected by the late Dr Fothergill, who gave direc¬ tions by his will, that his collection should be appraised after his death, and that Dr Hunter should have the refusal of it at L.500 under the valuation. This was accordingly done, and Dr Hunter purchased it for the sum of L,1200. By William Hunter’s will, the use of his museum, under the direction of trustees, devolved to his nephew Dr Mat¬ thew Baillie, and in case of his death, to Mr Cruikshank, for the term of thirty years; at the end of which period the whole collection was bequeathed, with L.8000, to the university of Glasgow, where it is now deposited. HUN HUN 31 Hunter, Dr In 1767 William Hunter was elected a fellow of the William n0yai Society, and in the year following communicated to „ N. its Transactions Observations on the Bones found on the umting^ banks of the Ohio River. In 1768 he became a fellow of the Society of Antiquaries, and in the same year was appointed by the king to be professor of anatomy to the Royal Academy of Arts, which he had recently founded. Hunter performed the duties of the new professorship with remarkable tact. The originality and soundness of his teaching, and his application of anatomical knowledge to painting and sculpture, evinced the greatness and versatility of his mind. In 1770 the connection of William Hunter with Hewson ceased, in consequence of some disputes, and the latter was succeeded by Cruikshank, a name deservedly celebrated amongst anatomists. The Anatomy of the Human Gravid, Uterus appeared in 1775, a work of classical value and im¬ portance, and which as such has lately been one of the works selected for republication by the Sydenham Society, Ten of the thirty-four plates which it contains had been completed so early as 1751 ; but the publication was re¬ tarded by Hunter’s anxiety to render his work as perfect as possible. In the preface he fully acknowledges the assist¬ ance he had derived from his brother John in making the necessary dissections, thanking him for it, and passing a graceful compliment upon his skill. Five years afterwards (1780), John presented a paper to the Royal Society on the structure of the placenta, in which he claimed for himself the honour of discovering the true mode of union between this organ and the uterus,—a discovery which William Hunter claims as his own in this work. This led to a com¬ plete estrangement between the brothers, which continued until William was on his death-bed. A reconciliation then took place, but the latter did not, in consequence, alter that portion of his will by which he left the family estate in Scotland (he having succeeded to it) to his nephew, Dr Baillie, to the exclusion of his brother. The engraver Strange (famous for his delicate execution) engraved two of the finest plates in the volume; and some of the others are remarkable for their beauty. William Hunter did not live to publish a work designed to illustrate the engravings and descriptive anatomy of the gravid uterus ; but he left very ample materials for the purpose, which were edited in 1795 by Dr Baillie, and published in a thin quarto volume. Dr John Fothergill having died, William Hunter suc¬ ceeded him in January 1781, as president of the Medical Society. In the preceding year he had been elected one of the foreign associates of the Royal Medical Society of Paris; and in 1782 he received a similar mark of distinc- Hunter, Dr tion from the Royal Academy of Sciences of Paris. In the William following year he died. xj . e a Hunting. About ten years before his death, William Hunter found v b, his health so much impaired, that he proposed to recruit it by residing in Scotland, and was about to complete the pur¬ chase of a considerable estate, when the project was aban¬ doned in consequence of a defect in the title. This ended his rural plans, and he thenceforth remained in London, suffering from repeated attacks of gout; it was this disease which terminated his life, notwithstanding his abstemious regimen. On Saturday the I5th of March 1783, after hav¬ ing for several days experienced a return of a wandering gout, he complained of great headache and nausea. In this state he went to bed, and for several days felt more pain than usual, both in his stomach and limbs. On the Thurs¬ day following he found himself so much recovered, that he determined to give the introductory lecture to the opera¬ tions of surgery. It was to no purpose that his friends urged on him the impropriety of such an attempt. He was determined to make the experiment, and accordingly de¬ livered the lecture; but towards the conclusion his strength was so exhausted that he fainted away, and was obliged to be carried to bed by two servants. During the night and the following day his symptoms were such as indicated danger; and on Saturday morning, Mr Combe, who made him an early visit, wras alarmed on being told by Dr Hunter himself, that during the night he had certainly had a para¬ lytic stroke. As neither his speech nor his pulse were affected, and he w^as able to raise himself in bed, Mr Combe encouraged him to hope that he was mistaken. But the event proved that Hunter’s idea of his own complaint was but too well founded. He died on Sunday the 30th of March 1783. Turning to his friend Combe in his latter moments, he observed, “ If I had strength enough to hold a pen, I would write how easy and pleasant a thing it is to die.” William Hunter is described as being regularly shaped, slender, and rather below the middle height. He was an early riser, courteous, prudent, and economical. When he invited his younger friends to his table, they were sel¬ dom regaled with more than two dishes; when alone he rarely sat down to more than one ; he would say, a man who cannot dine on this deserves to have no dinner. After the meal his servant (who was also the porter at the ana¬ tomical theatre), used to hand a single glass of wine to each of the guests. It was by the aid of such habits that Wil¬ liam Hunter was enabled to devote L.70,000 to the ad¬ vancement of medical science, (T*L-) HUNTING. One of the greatest compliments paid to the chase is, its having been considered as a theme worthy the pens of the ablest writers of the most refined periods of the world. Whilst Greece was the nursery and residence of every branch of polite literature, and of all the arts and sciences then known to mankind; whilst every study that depends on the powers of the imagination, or the faculties of the un¬ derstanding, was there carried to the very summit of per¬ fection, we find Xenophon composing his Kw^yeri/cos, treating of every description of field-sports. He, according to the custom of the times, opens the subject with fable, and tells us that hunting, which he calls the gift of the gods, and the use of dogs, originated with Apollo and Diana, and that the invention was made a present of to Chiron, who took pupils in the art, each of whom was, in his turn, hon¬ oured by the gods (aTro tfeoiv eTiyqOrj). His real object, however, was to encourage in the youth of his country a taste for the pleasures of the chase, and other manly pas¬ times, as the best preparation for war, the senate, and the world. Whilst he condemns the effeminate man as shame¬ fully useless to his country, he represents the well-trained sportsman as not only mighty in war, but ready to sacrifice his person and his wealth to the public good. As a prepa¬ ration for war, and particularly the higher branches of the soldier’s profession, we need not the testimony of Xeno¬ phon ; for our own experience has shown us that, speaking generally, no man takes a view of a country, at first sight, with equal facility to a sportsman, particularly a sportsman who has been accustomed to follow hounds. Indeed, un¬ less he have what is called in the field “ a good eye to a country,” he cannot ride with judgment after hounds in our inclosed or woodland districts ; and when the chase is con¬ cluded, it is surprising to witness the rapidity with which an experienced fox-hunter sees the points of a country in 32 Hunting. which he is a stranger, that must lead him towards his wished-for home. With respect to the other advantages alluded to by Xenophon, he had very good authority for what he asserted of them. The Olympic games were esta¬ blished by the Greeks for two distinct purposes: first, to inspire their youth with a love of glory, as well as a taste for manly and invigorating exercises, conducive to contempt of danger, and coolness when exposed to it; and, secondly, with a view of drawing together the leading men of the different states of Greece, which gave them an opportunity of deliberating upon matters of general concern. As re¬ garded the other various occupations of life which a gentle¬ man is called upon to fulfil and do honour to, we may re¬ mark, that an irreproachable moral character was a neces¬ sary qualification for a competitor at those games or sports. Drawing something like a parallel here, then, we may add, that neither is a sportsman in our own country esteemed, how skilful soever he may be, if his character be tainted with fraud; and we are not unmindful of the advantages derived from the mixture of society in the hunting-field, or of the many valuable and lasting friendships that may be dated from accidental meetings by the cover side. But Xenophon wrote in praise of hunting rather perhaps as a soldier than a philosopher, giving it as his opinion, that the exercise of the chase formed the best soldiers in the world.; that it habituated men to cold, heat, and fatigue; that it kindled courage, elevated the soul, and invigorated the body ; that it retarded the effects of age, and rendered the senses more acute ; and, finally, that the pleasure it afforded was a sovereign remedy against all mental uneasiness ; in which latter sentiment he is seconded by a modern author of celebrity, who says that u the chase fortifies the heart as well as the body.” Nor is Xenophon the only eminent soldier or philosopher of his renowned country who has written in commendation of hunting. Aristotle wrote a treatise on field-sports, by order of Alexander the Great; and Polybius, one of the greatest soldiers of any age, re¬ lates that Maximus restored discipline in the Roman legions, by often exercising them in hunting; and he even goes so far as to celebrate one individual sportsman, Ptolemy Epi~ phanes, for his dexterity in killing a wild bull. Amongst the poets of Greece, Oppian distinguished himself highly by his poems on hunting. So excellent, indeed, were they considered by his emperor, that he is said to have presented him with a piece of gold for every verse they contained, and thus they acquired the honourable appellation of “ the golden verses of Oppian.” Several of the most splendid similes of Homer are taken from hounds in chase, and in the manly disposition of Achilles wre see the formation of the heroic character by the pursuits of the chase. The Romans at one time discouraged hunting amongst the upper orders of society, from the fear of its becoming a passion which might divert them from their essential duties. But here they committed an error; for, aware of its bene¬ ficial effects in forming their people for war, they substituted public exhibitions of animals destroying each other in an amphitheatre, which could only have hardened the heart, without advantage to either body or mind. Yet we find many of their emperors encouraging hunting, and many of their best writers extolling it. The learned and polished Hadrian was so passionately addicted to hunting, and also to horses and dogs, that he erected monuments to the me¬ mory of the latter, and built a city on the spot on which he had killed a wild boar, after a desperate encounter with him, and which he called by a word which, being inter¬ preted, signifies Hadrian’s chase. Amongst the celebrated writers of the Augustan age, we may mention two, who, not being themselves sportsmen, could only have made sporting a subject for their pens from a sense of the bene¬ fits arising from it. Virgil makes his young Ascanius a sportsman as soon as he is able to sit his horse ; and he also HUNTING. makes him, at a very early age, the first in the fight (pri- y ^ mum hello), as he had been the first in the field. In the speech addressed to him by the bold Numanus, which cost that hero his life, we have the fittest contrast of the evils of effeminate habits with the benefits of manly pursuits, that the pen of a satirist could produce. The words, O veree Phrygice, iieque enim Phryges ! “ Oh, worse than women in the shape of men,” convey the severest rebuke a nation could receive for having made themselves contemptible to their enemies, by the effects of an effeminate life, and pur¬ suits unworthy of men ; whereas the advantages of the manly exercises of youth are finely set forth in the vaunt¬ ing exclamation of this hardy Rutulian. Neither is Horace behind his contemporary poet in his disgust of an effeminate youth. In the twenty-fourth ode of his third book, he beautifully contrasts those softening pleasures which emas¬ culate the mind and enervate the body, with the opposite effects of manly sports and exercises ; and in his justly cele¬ brated Epistle to Lollius, he recommends the chase, not only as a noble exercise, but as contributing to health and peace of mind. His Carmen Sceculare was also written in honour of manly exercises ; and in another of his odes we find him upbraiding a young Roman for giving up the manly exercise of riding; and glancing at the destruction of Troy, and the feminine education of Achilles, seems to insinuate, that effeminacy was likely to destroy the ener¬ gies of his own countrymen, as it had those of others. That his apprehensions were not unfounded, a few centuries proved; for the Romans, after the conquest of Persia and other distant kingdoms, participating in their luxurious ha¬ bits, became as easy a prey to the Goths and Vandals, as the Grecians and other nations had before been to them¬ selves ; and, in the decline of the republic, the few victories which they gained were achieved but by the terror of their name. Minor poets have also made sporting their theme. Gratius wrote a poem on coursing. He was contemporary with Ovid, and a sportsman, as the knowledge of his sub¬ ject denotes. Nemesianus also, three centuries afterwards, wrote some poems on hunting, though they have not been so highly esteemed. But the sports of the field are alluded to by innumerable classic writers, and made the ground¬ work of their most beautiful allegories and fables, both in verse and prose; and perhaps, after all, the greatest com¬ pliment that can be paid to them, as well as the best an¬ swer to the assertion that any man can make a sportsman, is to be found in the latter department of literature. We allude to the letters of that accomplished country gentleman and scholar, Pliny the consul, in which he speaks of his prowess in the chase. In one addressed to Tacitus the his¬ torian, boasting of a famous day’s sport he had been enjoy¬ ing, he also boasts of the good effect it had had on his mind, telling him that Minerva accompanied Diana on the hills ; and in the eighteenth letter of the fifth book he goes a point beyond this : “ As for myself,” says he to his friend Macer, “ I am employed at my Tuscan villa in hunting and studying, sometimes alternately, and sometimes both to¬ gether ; but 1 am not yet able to determine in which of those pursuits it is most difficult to succeed.” It is not surprising that hunting should have been the theme of poets, as poetry then ceases to be the language of fiction ; neither can the subject itself be deemed unpoetical, as it affords an opportunity to expatiate, not merely on the beauties, but also on the endowments of nature. That the feelings of nature have more of rapture in them than those which are excited through the medium of science, is a fact which cannot, we think, be denied ; and thus do we account for the exhilarating passion of the chase. To describe a chase, however, is a task of no small difficulty, and perhaps more so in prose than in verse, as the imagination must be powerfully excited by the transporting scenes on which it has dwelt, and cannot well be restrained in a mere recital HUNTING. 33 Hunting. of facts. When the noise of the battle is over, powerful must be the pen that could revive the clang of arms. “ The chase is done,” sings Ossian; “ and nothing is heard on Ardven but the torrent’s roar.” Somerville’s poem of The Chase will live to the end of time ; for although it was not faultless in the eyes of the perhaps too rigid Johnson, it is written with the spirit and fire his subject demanded; and many of the instructions it conveys, when stripped of their poetical dress, are esteemed by sportsmen of the present day. “ Manners,” says Lord Karnes, “ are never painted to the life by any one to whom they are not familiarneither could a man have written the poeni we speak of unless he had been himselt a sports¬ man. Indeed his descriptions of hunting the hare, the stag, and the fox, place the objects clearly and beautifully before our eyes, and show that the poet had often witnessed with rapture the scenes to which he devoted his muse. I he fol¬ lowing passage, descriptive of the feelings of a master of hounds on a hunting morning, is not merely truly natural, but at the same time highly poetical:— “ Hail, gentle dawn ! mild, blushing goddess, hail; Rejoic’d I see thy purple mantle spread O’er half the skies ; gems pave thy radiant way, And orient pearls from every shrub depend. Farewell, Cleora! here, deep sunk in down, Slumber secure, with happy dreams amused. . . . . Me other joys invite; The horn sonorous calls, the pack awak d Their matins chaunt, nor brook my long delay : My courser hears their voice ;—See there ! with ears And tail erect, neighing, he paws the ground : Fierce rapture kindles in his redd’ning eyes, And boils in ev’ry vein.” Although hunting songs are a species of ancient lyrics, of which the specimens are rare, and in our own country “ the songs of the chase” do not appear to include any earlier than the middle of the seventeenth century, we have some of a more modern date that have been highly popular with the public, and no doubt have given the original impulse to many a good sportsman. The power and force of national songs have never been disputed in any age; and he who said that if he were allowed to compose the ballads of a nation, he would soon alter its form of government, Tittered a boast not altogether unfounded in the principles of human nature. Compositions of this kind, then, that tend to en¬ courage a love of manly pursuits and pastimes, and give a relish to a country life, should by no means be thought lightly of by a people who, like ourselves, have ever been conspicuous for our excellence in the one, and our fondness for the other; but which, in the opinion of some, appear to be on the wane, as the natural consequence of our present state of almost excessive refinement. This would be a real cause for regret. The fondness for rural life amongst the higher order of the English has hitherto had a great and salutary effect upon the natural character of their country; and there cannot be found a finer race of men than the country gentlemen of Great Britain. Instead of the soft¬ ness and effeminacy which characterize the men of rank of most other nations, they exhibit a union of natural elegance and strength, a robustness of frame and freshness of com¬ plexion, which are to be attributed to their living so much in the open air, and pursuing so eagerly the invigorating recreations of a country life. Their hard exercise produces a healthy tone of mind and spirits, as well as of body, ac¬ companied with a manliness and simplicity of manners, which even the follies of a town cannot easily pervert, and can never entirely destroy. Let us, however, hope that the fears on this head are groundless; let us hope that what Horace sighed for, what Cato, Plato, and Cicero recom¬ mended, what Bion eulogized, what all the best poets of antiquity sang the praises of (according to the poets, the golden age was spent in the country), and for which kings VOL. XII. and emperors quitted their thrones, will never be ill suited to, or considered as beneath, the taste of a British country gentleman, in what circle soever he may move. I hat the sports of the field are classical, the authority of all ages will vouch for; neither is the man of fashion, or haut ton, by any means incompatible with the country gentleman and sportsman. On the contrary, how has the character of Paris been handed down to us by the poets ? Was he not the finest gentleman, the greatest favourite of the female sex, the greatest beau of his day ? Such he is represented to have been; but, although a prince, he had been bred a shepherd; and from the robust habits he had acquired in his youth, he was the only man who could stand up against the powerful arm of Dares, the great champion of his day. What was the all-accomplished Pliny, or Lollius, whose education Horace had superintended ? Again; on the score of health, the chief felicity of man, were it not for the sports of the field, the softness and effe¬ minacy of modern manners, in the higher walks of life, would soon exhibit their pernicious effects on forthcoming generations, by depriving them of their natural defence against diseases incident to our climate, by subjecting them to that morbid debility and sensibility of the nervous system which lays the foundation of most diseases, as also depriving them of the courage to support them. And who enjoys the blessing of health equally with the country gen¬ tleman and sportsman ? Somerville says, Hunting. “ In vain malignant steams and winter fogs Load the dull air, and hover round our coasts; The huntsman, ever gay, robust, and bold, Defies the noxious vapour, and confides In this delightful exercise to raise His drooping head, and cheer his heart with joy.” Certain is it, the rough sports of the country have been known not only to cure diseases of long standing in the human frame ; but the exercise of hunting, with the tempe¬ rance it enjoins, absolutely steels the constitution, as the poet expresses himself, against the attacks of the most com¬ mon of the diseases peculiar to this variable climate. Its effect on the mind, which he also alludes to, is of no less value; for, from the very exhilarating nature of the amuse¬ ment, it relieves it from dwelling upon its anxieties, from which few persons are free ; and it is one of the best cures for the heartache, or any of those shocks which our flesh is heir to:— “ Dona cano divum, lostas venantibus artes, Auspicio, Diana, tuo,” sang the poet Gratius; and Horace’s description of a sports¬ man’s return to his family, after the toils and perils of the day, is a true picture of a country life, replete with every possible enjoyment. Objections have been made to encouraging youth in a love of our national field-sports, on the score of their en¬ grossing too much of their time and attention, to the ne¬ glect of more necessary attainments. “ It is true,” says a Roman historian, “ the masters in every branch of learning, whom the accomplished father of Commodus provided for his son, were heard with inattention and disgust; whilst the lessons of the Parthian, or the Moor, in the arts of the javelin and the bow, could not be too often repeated.” But where is the pursuit that may not be carried to excess ? and yet without zeal no person ever succeeded in field- sports of any kind, much less in hunting. “ Whatever thy hand findeth to do, do it with all thy might,” said Solomon; and had not Providence implanted this zeal in man’s nature, he never would have been what man now is, but, compara¬ tively a useless being. Objections are again made, that the sports of the field, hunting animals with dogs especially, are cruel; but the charge, if proved, does not altogether lie against man. The beasts and birds of the field have been given to him, as well as the way to procure them pointed E H U N T I N G. 34 Hunting, out to him ; or wherefore the almost unsearchable faculties of the dog ? Some persons, however, have thought other¬ wise: “ Is it a labour worthy of man,” says a very celebrated English writer, “ to watch from day to day, from night to night, the haunts of our fellow animals, that we may destroy them ? To triumph over a poor mangled hare or hind, after we have harassed them up and down the country for many hours together with an army of dogs and men ? Is it an exercise becoming the majesty of a rational spirit to run yawling with a parcel of hounds, perhaps a whole day together, after some timorous animal ?” In answer to this it may be urged, that we knew no other method of availing ourselves of them when first they were given for our use ; and it may be strongly urged, that the destruction of wild animals was never so speedily, and therefore humanely ac¬ complished, as it is at the present day. A century or two ago, the fox lingered all night in a trap, and then too often was subjected to a lingering, if not an agonizing death. He is now killed by hounds, generally in a short time, if he can¬ not escape from what may be deemed his lawful pursuers. The buck in the forest of the king, or in the park of the nobleman, is now no longer hunted down by the slow but sure blood-hound, a race nearly extinct, but the unerring eye of the rifle-shot seals his doom on the spot. We agree with the poet, that “ Poor is the triumph o?er the timid hare but she was given for our use, and must be taken, as Esau took the venison, by hunting her ; and here likewise is an improvement. A hundred years back she was trailed up to her form, the operation perhaps of an hour, with the ter¬ ror-striking notes of the hounds all that time in her ear; and then pursued for at least two hours more, by animals with not half her speed, but with a power of following her by the foot, which it was nearly impossible to evade. At the present day she is whipped out of her form, twenty mi¬ nutes generally deciding her fate; and, in consequence of her being now pursued in the forenoon, instead of, as be¬ fore, just on her return from her walk, she escapes oftener than she is killed. Animals destined to fall by the gun are now nearly certain of meeting with instant death. In addi¬ tion to the increased skill of our marksmen, the improved formation of the gun enables it to carry destruction with a much surer hand, owing to the force and precision with which it carries its shot. Thus, if the game be stricken, it is stricken to instant death, not wounded and mangled by weak scattered shot. Another consideration presents itself in the discussion of this subject. Life is said to be “ sweetbut strip it of intellectual enjoyment, and its sweetness is very considerably abated. But we will go one step farther. The natural death of wild animals must generally be lingering, and often painful in the extreme ; they have no relief to fly to, but perish as it were by inches. This being admitted, perhaps the hand that instantly de¬ prives them of life may be deemed the hand of a friend. No great satisfaction would arise from a reference to the practices of the ancients in the field, who, it appears from Virgil, hunted anything, from the wild ass to the stag; but, we have reason to believe, without much sys¬ tem, as far as their dogs had to do with it. We conceive the ancient Germans and Gauls to have been the best early sportsmen upon system ; and the ancient Britons, who came originally from Gaul, and, according to Caesar and Tacitus, were one of the widely-extended Celtic tribes, introduced, or rather brought with them from Gaul, that ardent passion for the chase for which Great Britain has ever since been remarkable. The Anglo-Norman and early English monarchs likewise all appear to have had a passion for the chase; and although a code of laws rela¬ tive to hunting was formed by one of the Welsh princes in the twelfth century, containing a list of animals, climb¬ ing ones for example, which does not accord with the pre- Hunting, sent idea of hunting, we hear nothing of fox-hounds joer se, v ^ till we find them in the kennel of Edward L, and an item in his wardrobe book of L.21, 6s. as the annual expenses of his pack, consisting of six couples. Soon after this period, at all events in the course of the next king’s reign, the diver¬ sion of hunting in England may be said to have been first reduced to something like a science; treatises having been written on the subject for the instruction of young sports¬ men, as well as rules laid down for the observation and con¬ duct of those who filled the various offices, in the forest, the kennel, and the stable. One of the most curious of these performances, is a manuscript written in the beginning of the fourteeth century, in Norman French, by William Twice, huntsman to Edward II., an ancient translation of which occurs amongst the Cottonian manuscripts. In it are enumerated and described the different beasts that were then objects of the chase in England; and, in the manner of a dialogue, the huntsman is informed how he should blow his horn at the different points of a chase. But the generally rude system of hunting in the earlier days of England had previously been in some measure improved and amended by William the Conqueror, of whom Somerville thus writes:— “ Victorious William to more decent rules Subdued our Saxon fathers; taught to speak The proper dialect; with horn and voice To cheer the busy hound, whose well-known cry His list’ning peers approve with joint acclaim. From him successive huntsmen learn’d to join In bloody social leagues, the multitude Dispers’d ; to size, to sort, their warrior tribes, To rear, feed, hunt, and discipline the pack.” Edward III. was a great stag-hunter; and even at the time he was engaged in war with France, and resident in that country, he had with him, attached to his army, sixty couples of stag-hounds, and an equal number of hare- hounds. We also learn from Froissart, that the Earl of Foix, a foreign nobleman, contemporary with King Ed¬ ward, had 150 couples of hounds in his castle. But it does not appear that the fox was much in esteem for the chase by any of the Anglo-Norman sportsmen ; for in Twice’s Treatise on the Craft of Hunting, he is classed last of all the beasts of venery, excepting the martern and the roe; nor does Somerville in his poem treat him with the respect that he pays to the stag or the hare. The first public no¬ tice of him occurs in the reign of Richard II., who gave permission, by charter, to the Abbot of Peterborough, to hunt him. Hunting, however, in all its branches, appears to have advanced steadily till the last century, when it flourished greatly by the encouragement given to it by George III.; and as time improves every art, it has at length, we believe, attained perfection. Whatever pastime mankind indulge in, their first en¬ deavour should be to make themselves acquainted with the best means of pursuing it, which will greatly increase the pleasure derived from it. But as the philosopher was laughed at for his offer of teaching Alexander the Great the art of war, so the theory of no pastime is worth any¬ thing unless it be based on practice. And, perhaps, of all sports invented by reason for the use and amusement of mankind, there is none to which theory would avail so little as the noble and popular one of hunting. Indeed, the practical part of hunting, notwithstanding its popu¬ larity, is but little known, at least but little understood, from the perplexing difficulties that accompany it; and there is reason to believe it was still less understood before the appearance of a work in which the whole system is minutely and accurately detailed by an eminent sportsman, and master of fox-hounds, of the early part of this cen¬ tury. It is scarcely necessary to observe, that the work alluded to is Beckford’s Thoughts upon Hunting, in a series HUNTING. 35 Hunting, of familiar Letters to a Friend; of which it has been said, v—v~~' “ they are so truly the effusions of sound judgment, and so replete with the useful remarks of an experienced sports¬ man, that there is no room for anything new or additional to be introduced upon the subject.” It is true, this has been considered, and will continue to be considered, as a standard work amongst sportsmen ; but as systems and habits change with time, and many of both have been ma¬ terially changed since Beckford’s day, another work on fox¬ hunting, also from a practical pen, made its appearance in 1826, and was well received by the sporting world, viz., Observations on Fox-Hunting, and the Management of Hounds in the Kennel and the Field, by Colonel Cook, several years a master of fox-hounds, hunting various Eng¬ lish counties, but principally the Roothings ot Essex, cele¬ brated for the stoutness of its foxes. It is only within a very short space of time that sports¬ men have been given to communicate their thoughts, or the result of their experience in the field, to the public, unless under fictitious signatures. In proof, however, ot the benefit derived from such contributions to the stock of sporting science, if such a term will be allowed; and like¬ wise in confirmation of what has been advanced on the subject of change of systems and habits that occurs in the course of time, we will make a few comments on the prac¬ tices of one of the most conspicuous sportsmen England ever gave birth to, the unrivalled Hugo Meynell, Esq. of Quorndon Hall, Leicestershire, and made partially known through the medium of a small pamphlet, entitled, The Meynellian Science, or Fox-Hunting upon System, by the late John Hawkes, Esq., a personal Ifiend of Mr Meynell’s. That Mr Meynell studied fox-hunting as a science, we believe no one will deny; and that his master-mind was quite equal to the task he imposed upon himself, is also an admitted fact; for he was a man of more than ordinary acuteness, coupled with a close and accurate observation ot everything that passed under his eye; and all this with the benefit of an education perfected beyond the usual extent of that bestowed upon, or, perhaps we may say, sub¬ mitted to, by young gentlemen of large fortune in his day, having studied nearly three years under a private tutor after he became of age. That he shone beyond all others who had preceded him, in the breeding and management of hounds, is a fact universally admitted, producing, as Mr Hawkes says of them, “ the steadiest, best, and handsomest pack of fox-hounds in the kingdomadding also the em¬ phatic remark, that his object was to combine strength with beauty, and steadiness with high mettle. His ideaot perfect shape was, short backs, open bosoms, straight legs, and compact feet; and the first qualities of hounds he considered to be fine noses and stout runners, opinions which all found to hold good. But there were peculiarities in Mr Meynell’s system of hunting, to which, as detailed by Mr Hawkes, we scarcely know how to reconcile ourselves. For example, he tells us that his young hounds were broken in to hare in the spring of the year, “ to find out their propensities, which, when at all flagrant, they early discovered, and he drafted them according to their defects and in the same page he adds, “ after hare-hunting, they were, the remaining part of summer, daily walked amongst riot.” Now we cannot approve of entering hounds to an animal they are not in¬ tended to hunt, and are at a loss to comprehend what is here meant by the word “ riot,” unless it be hares (as the term generally implies) or deer (which were never found wild in his country), which they had been previously in¬ structed to hunt. Their “ propensities,” also, by which is here generally understood their steadiness or unsteadiness, must, under such circumstances, have been rather difficult to pronounce an opinion upon, with the exception of their promising to be true to the line, and not given to skirt. The goodness or badness of nose could of course have been Hunting, discernible when hunting their own game (the fox), to which, > in our opinion, all fox-hounds should be entered. Beckfbrd, we remember, speaks of his huntsman letting his puppies enter to a cat; but we cannot approve of such a practice. Early in the autumn Mr Meynell hunted his woodlands, Charnwood Forest chiefly, with his whole pack, and^ then divided them into “ the old” and “ the young pack; but, to show the disadvantage of this system, Mr Hawkes says, the young hounds were hunted twice a-week, as much in woodlands as possible, and in the most unpopular districts.” The present plan of mixing young and old hounds together is far preferable to this, not only as they can then take their turn in the good and popular “ districts,” but, by having the assistance of older hounds in chase, the younger ones are less likely to do wrong. Mr Meynell’s idea of perfection in hounds, in chase, Mr Hawkes says, “ consisted of their being true guiders in hard running, and close and patient hunters in a cold scent, to- o-ether with stoutness. Their imperfections, over-running the scent, and babbling, were considered their greatest faults.” To all this every sportsman must assent. The following passage contains perhaps rather more of enthusiasm than of fact', although a qualification is given to it in the concluding sentence. “ Mr MeynelPs hounds,” says Mr Hawkes, “ were criticised by himself and his friends in the most minute manner. Every hound had his pecu¬ liar talents, and was sure to have a fair opportunity of dis¬ playing them (!) Some had the remarkable faculty of find¬ ing a fox, which they would do, almost invariably, notwith¬ standing twenty or thirty couple were out in the same covert. Some had the propensity to hunt the doubles and short turns. Some were inclined to be hard runners. Some had a remarkable faculty of hunting the drag of a fox, which they would do very late in the day. And sometimes the hardest runners were the best hunters; and fortunate was the year when such excellencies prevailed.” “ Mr Meynell,” continues Mr Hawkes, “ prided himself on the steadiness of his hounds, and their hunting through sheep and hares, which they did in a very superior manner. He seldom or never attempted to lift his hounds through sheep ; and from habit, and the great flocks the hounds were accustomed to, they carried the scent on most cor¬ rectly and expeditiously, much sooner than any lifting could accomplish.” We are far from advocates for lifting hounds when it can be avoided ; but knowing the so often insur¬ mountable difficulties occasioned by flocks of sheep and herds of cattle in the country Mr Meynell hunted, in addi¬ tion to a crowd of horsemen pressing upon the heels ot the pack, we consider that if, under such circumstances, hounds do not almost instantly recover the scent, the assistance of the huntsman is called for. The “ steadiness and docility” of Mr Meynell’s pack, we have reason to believe, were re¬ markable, and are vouched for by other authority than Mr Hawkes’. “ A most extraordinary instance of discipline in hounds,” says Colonel Cook (p. 202), “occurs to me, which I ought to have mentioned when speaking of that unrivalled sportsman, the late Mr Meynell. He met in the Market-Harborough (Leicestershire) country, at a small patch of gorse on the side of a hill, in a very large pasture field: the hounds feathered as they went in, and found in¬ stantly. The covert being only about two acres, and open,^ Mr Meynell immediately saw that the fox was in danger of being chopped ; he therefore called out to Jack Raven, the huntsman, “ Jack, take the hounds away ;” and at one of his usual rates, every hound stopped, and the pack were taken to the hedge side, when Mr Meynell called out three steady hounds, and threw them into the cover. The fox was so loath to break, that the three hounds kept hunting him for ten minutes, in the hearing of all the pack, who lay perfectly quiet at Raven’s horse’s feet, till the fox went HUNTING. 36 Hunting, awav over the finest part of the country ; and the moment Mr Meynell gave his most energetic, thrilling holloo (Mr Hawkes speaks of the power of Mr Meynell s cheering holloa, which, he says, “ thrilled through the heart and nerve of every hearer”), every hound flew to him; the burst was the finest that any sportsman ever beheld, and after an hour and ten minutes they killed their fox. Ihis is doubtless an astonishing instance of command of hounds with a scent before them, particularly so to those persons who are aware of the generally uncontrollable power of the impulse given to them by nature at that particular time ; and were it not for the high reputation of the pack alluded to, we should, as we cannot doubt the fact, be inclined to say, it savoured a little of slackness, or, at all events, of a too severe dis¬ cipline, bordering upon the annihilation of the distinguish¬ ing natural properties of the fox-hound, namely, high mettle and dash. “ Mr Meynell,” adds Mr Hawkes, “ was not fond of cast¬ ing hounds ; when once they were laid upon the line of scent he left it to them ; he only encouraged them to take pains, and kept aloof, so that the steam of the horses could not interfere with the scent. It is true, hounds should not be cast, if they can do the work themselves ; and if the au¬ thority of Mr Meynell could restrain a Leicestershire field of horsemen to keep aloof when his hounds were at check, more time may have been given them to make their own cast; but it must be recollected, that when the hounds are at fault, the fox is not.” Again, “ when his hounds came to a check, every encouragement was given to them to recover the scent, without the huntsman getting amongst them, or whippers-in driving them about, which is the common practice of most packs. The hounds were holloa’d back to the place where they brought the scent, and en¬ couraged to try round in their own way, which they gene¬ rally did successfully, avoiding the time lost in the mistaken practice of casting hounds at the heels of the huntsman. When the hounds were cast, it was in two or three different lots, by Mr Meynell, his huntsman, and whipper-in; and not driven together in a body, like a flock of sheep. They were allowed to spread, and use their own sagacity, at a very gentle pace ; and not hurried about in a blustering manner. It was Mr Meynell’s opinion, that a great noise, and scold¬ ing of hounds, made them wild. Correcting them in a quiet way was the most judicious method. Whippers-in also should turn hounds quietly, and not call after them in a noisy, disagreeable manner.” In all the foregoing remarks we coincide with the opinions of these two celebrated sports¬ men. We think a huntsman should never be nearer than from 60 to 100 yards of his hounds when they first check ; nor can a whipper-in execute his office of turning or stop¬ ping a hound at this moment too quietly and discreetly ; but no general line of conduct for either the one or the other can be laid down. Some hounds, and especially if they have been pressed upon by horsemen, will not turn to either horn or holloa, without a smack of the whip, or at all events a rate; nor will the body of the pack, if a little blown, or excited by a previous holloa, always try for their fox so well and quickly as they should do, if left quite to “ themselves ; or, as Mr Hawkes so properly expresses himself, if left to “ their own sagacity.” That a great noise makes hounds wild no one doubts, and the system of holloaing is every year on the decrease. As for the division of the pack into three lots when at fault, that perhaps originated with Mr Meynell: indeed we believe it did; but the practice is now become not uncommon, of its being divided into two, namely, one lot with the huntsman, and the other with the first whipper-in. “ When hounds are going to the cry,” writes Mr Hawkes, “ they should be encouraged in a pleasant way : not driven and rated, as if discord was a necessary ingredient in the sport and music of a fine cry of hounds. Whippers-in are too apt to think their own importance and consequence consist in shouting, holloaing, and unnecessary activity. When hounds can hear the cry, they get together sooner than any whipper-in can drive them. If any hound is con¬ ceited, and disinclined to go to cry, he should immediately be drafted.” On the subject of blood, that is, killing and eating foxes, we entirely assent to the following remarks: “ Blood was a thing Mr Meynell was more indifferent about than most masters of hounds. The wildest packs of hounds were known to kill the most foxes in cover, but very seldom showed good runs over a country. Hounds chopping foxes in cover is more a vice than a proof of their being good cover-hounds. Murdering foxes is a most absurd prodi¬ gality. Seasoned foxes are as necessary to sport as experi¬ enced hounds.” Our own opinion of the value of blood to hounds perfectly accords with that which, it appears, wTas entertained by Mr Meynell; namely, that it is far from a sine qua non to the well-doing of fox-hounds, or any other hounds, as is apparent at once from the modern system of hunting the stag. If it be possible, the pack are not per¬ mitted to break his skin, much more to devour him; still, despite of the rating and flogging they get to prevent their injuring the object they are pursuing, they do pursue it to the last with all their might and main. But let it not be supposed that we set no value on what may be termed well- carried blood. On the contrary, we think the flesh and blood of a fox well found, and handsomely killed, by hounds in the moments of high excitement, must be very beneficial to them. But when chopped in a cover (generally the effect of accident, and not, as Mr Hawkes supposed, of vici¬ ous propensity in any individual hound), we consider a round of beef would be a more acceptable present to them ; nor is the case much altered when a fox is dug out of an earth, after perhaps an hour’s delay. We remember to have heard Mr Osbaldeston assert, that the best week’s sport he ever had in Leicestershire when he hunted it, was after his hounds had been out nine days in succession without tasting a fox. “ Mr Meynell’s natural taste,” continues Mr Hawkes, “ led him to admire large hounds ; but his experience con¬ vinced him that small ones were generally the stoutest, soundest, and in every respect the most executive. His hounds had more good runs than any pack of his day. Two very extraordinary ones happened of a very rare descrip¬ tion. One was a run of one hour and twenty minutes with¬ out a check, and killed their fox. The other was two hours and fifty minutes without a cast, and killed. The hounds in the first run kept well together, and only two horses per¬ formed it; the rest of the field were unequal to its fleetness. The other run alluded to was performed by the whole of the pack ; and though all were up at the death, two or three slackened in their pace just at the last. One horse only went the whole of it.” Mr Hawkes thus speaks of the necessary qualifications of hounds to show sport:—“ To obtain a good run, hounds should not only have good abilities, but they should be ex¬ perienced, and well acquainted with each other. To guide a scent well over a country for a length of time, and through all the difficulties usually encountered, requires the best and most experienced abilities. A faulty hound, or injudicious rider, by one improper step, may defeat the most promising run.” It is evident, from the above judicious observations, that an old established pack of hounds must have great ad¬ vantages over one of an opposite character. We shall finish our extracts from this little pamphlet, which was merely circulated privately amongst the author’s friends, but valued as from the pen of so eminent a sports¬ man as the late Mr Hawkes proved himself to be, both in the field and on the race-course, where he shone conspicu¬ ously as one of the best gentleman jockeys ofhis day, with HUNTING. 37 Hunting, his judicious remark on the conduct of sportsmen who fol- ' low hounds. “ Gentlemen, and every person who makes hunting his pursuit,” says he, “should learn to ride judi¬ ciously to hounds. It is a contemplative amusement; and much good diversion might be promoted by a few regular precautions. The principal thing to attend to is, not to ride too near the hounds, and always as much as possible antici¬ pate a check. By which means the leading men will pull their horses up in time, and afford the hounds fair opportu¬ nity to keep the line of scent unbroken. Sheep, cattle, teams at plough, and arable land, are all causes of checks. Thoughtless sportsmen are apt to press too much on hounds, particularly down a road. Every one should consider that every check operates against the hounds, and that scent is of a fleeting nature, soon lost, never again to be recovered.” The following is the concluding paragraph, affording a o-ood specimen of the writer’s enthusiastic love of fox-hunt- mg, as also of a cultivated mind :—“ Fox-hunting,” he asserts, “ is a manly and fine exercise, affording health to the body, and matter and food for a contemplative mind. In no situation are the faculties of man more displayed. For¬ titude, good sense, and collectiveness of mind, have a wide field for exercise ; and a sensible sportsman would be a re¬ spectable character in any situation in life. The field is a most agreeable coffee-house, and there is more real society to be met with there than in any other situation in life. It links all classes together, from the peer to the peasant. It is the Englishman’s peculiar privilege. It is not to be found in any other part of the globe, but in England’s true land of liberty ; and may it flourish to the end of time !’’ There is perhaps no part of the material of fox-hunting more interesting than the management of hounds in the kennel, which, we do not hesitate in saying, presents one of the most curious scenes that are anywhere displayed in the whole circle of the transactions of mankind with the inferior animal creation. TLo see sixty couples of those animals, all hungry as tigers, standing aloof in their yard (as is the practice in some kennels), and, without even hearing, much less feeling, the whip, not daring to move until the order is o-iven to them to move. And what is the order given ? why, at the words, “ Come over, Bitches," or, “ Come over, Dogs" every hound of each individual sex comes forward, as the sex it belongs to may be called for, leaving those of the other sex in their places; and then the act of drawing them to the feeding troughs is an exceedingly interesting sight. Often, with the door wide open, and the savoury meat in their view, the huntsman has no use for his whip, having nothing to do but to call each hound by his name, which&of course he readily answers to. The expression of countenance, too, at this time, is well worthy of notice; and that of earnest solicitation, of entreaty, we might almost say of importunity, cannot be more forcibly displayed than in the face of a hungry hound awaiting his turn to be drawn. He appears absolutely to watch the lips of the huntsman, anticipating his own name. A view of a pack of fox-hounds likewise in their lodging-rooms, is a most agreeable sight to those who love to see animals in a high state of enjoy¬ ment, which no doubt hounds are when reposing on their well littered-down benches after a hard day’s work, and with their bellies well filled. They absolutely appear to feel for each other’s comforts, in placing themselves in situations that enable their fellow-creatures to repose parts of their bodies upon their own, to render their position for sleep and rest more agreeable to them. The system of fox-hunting has been much changed since that sport commenced. Almost all foxes were once found by the drag, and the first challenge was loudly cheered in days when the game was scarce. A long drag, however, although a great test of nose, is by no means desirable, as, if it happens to be down wind, the fox takes the hint, and is off long before the hounds can hunt up to his kennel. It was nevertheless a fine feature in the sport, as the gra- Hunting, dual increase of cry, the cheering holloas ol the spoilsmen, v v 1 J and the crash when the fox was unkennelled, conti ibuted greatly to ennoble the scene, and created, as it were, two climaxes in a chase, when it ended in blood. But another disadvantage attended it. Hounds could not be depended upon, taking the average of scent, to hunt a drag that had become cold; so they were obliged to be out very early in the morning, which was not only disagreeable, as encroach¬ ing upon the sportsman’s rest, but was coupled with the disadvantage, at all events with the risk, of finding a gorged fox, too full to run far, much less to run fast. Ihe modern system does not require the drag, as woodland covers are comparatively small to what they used to be; gorse covers made for the purpose of holding foxes are easily accessible to hounds accustomed to draw them; and the game is in most countries so plentiful, that if a fox be not found in one cover, he is almost certain to be found in another, and that not far off. The consequence is, no more time is now lost in drawing two or three gorse covers, than the drag of one fox formerly occupied; neither did that always lead to a find. Moreover, at the present hour of finding, there is but little chance of unkennelling a gorged fox. It is by some asserted, that what are called woodland foxes are stouter runners than those bred in the artificial gorse and other covers, and we have good reason to believe they are so. But the great objection to large woodlands is the uncertainty of getting a run, from the difficulty of making foxes break from them, as they naturally hang to places which appear to afford them security; and it often happens that hounds, and the horses of the servants, have done a fair day’s work before the run begins. On the other hand, we admit that a fox found in a wood of con¬ siderable extent is more likely to show a decidedly good day’s sport, than one found in an artificial coyer, and for this reason: he slips away unperceived, eight times out of ten, and consequently has time to look about him, and make his points, ere the chase commences: whereas a fox viewed away from a small gorse cover, within sight of a hundred or two of horsemen, is bullied, frightened, and soon blown, which occasions him to run short: and, of course, if the scent serves, and the hounds are good, he cannot live long, half an hour being as much as can be calculated upon under such circumstances. Gorse covers, however, if not too small,—not under three or four acres,—are indispensable in a hunting country, as foxes are very fond of them for their security against anything but fox-hounds; and an¬ other great advantage attending them is, that they can be placed wherever it may be thought desirable to place them. The making of gorse covers requires no small attention, we had nearly said skill. The ground is all the better for being trenched to the depth of from a foot to a foot and a half, and it should be made as clean and in as good con¬ dition as if it were to be the seed-bed of turnips. The seed should be minutely examined, as it often fails from having lost its germinating properties; and it should be drilled in the ground, and hoed, after the manner of a turnip crop. By keeping it clean by the hoe, it will, if the seed be good, and the land dry, often hold a fox in the second year, but will seldom fail in the third. Some writers, Colonel Cook among the number, speak of broom being sown amongst gorse. This should never be, as all hunts¬ men who draw, or run through, broom covers, can vouch for their being decidedly inimical to scent. A novel de¬ scription of fox-cover came into fashion a few years back in Leicestershire, but is not highly approved of, from the difficulty hounds experience in drawing it. Strong black thorn stakes are driven into the ground endways, at a small distance apart, and the rank grass and weeds growing ra¬ pidly over, and entwining with them, form a strong cover the first year; and it is found proof against a fall of snow, r 38 HUNTING. Hunting, which gorse covers are not, and are often forsaken by foxes on that account. All artificially-made covers should be not nearer than half a mile at the least to any house or village; and if on a gently sloping bank, facing the south, foxes will like them better. Some sportsmen object to many rides being cut through covers, as they are so often the cause of foxes being headed by the horsemen. The objection in part holds good; but ascertain number of rides are necessary in all large covers, to enable the servants to get near their hounds, who might otherwise be disposed to run riot, as they soon discover when they are out of the reach of either rate or whip. Woodlands, with rides in them, are essential to the making of young hounds in all countries; and the finest in Eng¬ land are those of the Duke of Buccleuch, near Keltering, in Northamptonshire, within the limits of the Pytchley Hunt, with rides, or, speaking more properly, avenues in them, to the extent of upwards of fifty miles. When speaking of the disadvantages of large woods, in which foxes are apt to “ hang” or dwell, Colonel Cook recom¬ mends killing a fox, and letting the hounds eat him, in the middle of them; which we believe will generally have the desired effect. On the other hand, should a fox be killed in a small cover, he should, if possible, be carried out of it before the hounds break him up. One of the best gorse covers in the D unchurch country did not hold for two or three seasons, because a dead fox was left in it. The arrangement of earths, and the stopping of them, are matters of no small importance. Artificial ones are reckoned unhealthy for foxes; and the best are those made by badgers, which can always be commanded at pleasure, by turning out those animals in pairs. There are various methods of stopping earths, but none more secure than by a bunch of gorse, or furze, crammed well into the mouth of them, with the stalks pushed inwards, When earths are only slightly stopped, a fox will scratch his way into them ; and as this very often happens, it shows the necessity of a careful and experienced earth-stopper; and it is better to pay for each day’s stopping rather than annually in the lump, reserving the power to withhold payment in case of evident neglect. The expense of earth-stopping varies according to the nature of the soil, covers, &c.; but in cer¬ tain countries it amounts to as much as L.200 per annum. It may also surprise some persons to hear, that the rent paid for covers in the Quorn Hunt amounts to upwards of L.2000 per annum. The multiplication of small artificial gorse covers has, however, sadly spoilt the breed of foxes, and converted many of them into mere “ ringerswhile the cross with the small cowardly French fox has also done much towards destroying their dash. The only way to re¬ cruit a country is to bring cubs from Ireland or the High¬ lands, where the greyhound fox is still to be found in high perfection. The following calculations of the expenses of a pack of fox-hounds are given by Colonel Cook, and admitted to be very near the mark ; making allowance for the difference in the price of markets at the time he made them, and at others. For Hounds hunting twice a-week :— Six horses, including groom and helpers L.300 Hounds’ food, for 25 couples 150 Firing 30 Taxes 80 Whipper-in and feeder 140 Earth-stopping 50 Saddlery 40 Farriery, shoeing, medicine, &c 50 Young hounds purchased, and expenses at walks 60 Casualties 100 L.1000 A second whipper-in, and two horses in addition 170 Total L.1170 Expenses for three times a-week :— Hunting, Twelve horses, groom, helpers, &c L.600 Food for forty couples of hounds 220 Firing 40 Taxes 100 Two whippers-in and feeder 210 Earth-stopping 65 Saddlery 80 Farriery, shoeing, &c 80 Young hounds purchased, and expenses at walks 80 Casualties 150 Total L.1625 Expenses for four times a-week :— Fourteen horses, &c L.700 Hounds’food for fifty couples 275 Firing 50 Taxes 120 Two whippers-in and feeder 210 Earth-stopping 80 Saddlery 100 Farriery, shoeing, &c 100 Young hounds purchased, and expenses at walks 100 Casualties 200 Total L.1935 “ If you do not attend to the kennel department your¬ self,” adds the Colonel, “ but keep a huntsman, the expense will be at least L.300 more.” The only remark we have to offer on the foregoing cal¬ culations is, that the author does not allow a sufficient num¬ ber of hounds for the several days’ hunting in the week. For example, we venture to say, that no country could be hunted four times a-week with fifty couples of hounds; at all events, fifty couples of hounds equal to that work are very rarely to be found. We agree with the writer, that either four times a-week, or even twice, are preferable to three, for keeping hounds in regular work, when sound. But on the subject of expenses we have a word or two more to say. Knowing, as we do, that they generally, we believe we may say always, exceed the calculations made by Colonel Cook, and in some instances by double, we con¬ sider it rather inconceivable that either noblemen or private gentlemen should be expected or permitted to bear all the charge of hunting a country themselves, knowing, as we do, the great sacrifices of property and income that have already been made to a perseverance in keeping fox-hounds, un¬ assisted by a subscription. The late Sir Richard Sutton, for instance, is supposed to have spent about L.8000 a-year over his stud and kennel, when he hunted the whole of the Quorn country at his own expense, with the exception of the rents of the covers. Hunting men are in fact becoming more and more anxious to have their sport at a master’s expense; and too many do not subscribe at all, or what is worse, forget to pay up when they have put their names down. But this cannot go on much longer; nor indeed is it, with some exceptions, fit that it should; and, in support of our assertions, we will quote the sentiments of a writer on this subject, admirably well expressed, in an old number of the JVew Sporting Magazine, which equally applies to the present day. After hinting at the probable decline of a sport, from this cause alone, which Mr Burke described as “ one of the balances of the constitution,” he thus proceeds:—“ As to the total abolition of the sport, we anticipate no such event. It is the favourite sport of Englishmen; and that which a man likes best he will relinquish last. Still, with the ex¬ ception of countries that boast their Clevelands, their Yar¬ boroughs and Suttons, their Graftons, Beauforts, Rutlands, Fitzwilliams, Segraves, Middletons (his lordship is since dead), and Harewoods—their great and sporting noblemen, in fact—we feel assured that, unless something be speedily arranged, half the packs in England must either be cur¬ tailed of their fair proportion of sport, or abolished alto¬ gether. This is not as it should be. Men are as fond of HUNT Hunting, hunting, at least of riding to hounds, as ever; but though v—we feel that we may be telling a disagreeable truth to many, the fact is, that most men want to hunt for nothing. The day for this, however, is fast drawing to a close. The breed of country gentlemen who keep hounds—the Ralph Lambtons, the Farquharsons, the Assheton Smiths, the Villebois, and Osbaldestons—are fast disappearing, in all probability never to be renewed. True that it is a fine, a proud sight, to see an English country gentleman spending his income on his native soil, and affording happiness and amusement to his neighbours, receiving their respect and esteem in return ; but we cannot help feeling, that unless a man has one of those overwhelming incomes that are more frequently read of than enjoyed, it is hardly fair that the expenses of a sport which affords health and recreation to hundreds should fall upon his individual shoulders. Heirs at law will not be hindered by the remoteness of relation¬ ship from impugning the conduct of their ancestors; nor will it be any consolation to a son, on coming into posses¬ sion of an overburdened estate, to know that the difficulties which oppress him were incurred for the purpose of keep¬ ing a pack of fox-hounds, by which his father afforded amusement to the country.” Fox-hunting is a sort of prescriptive right, which Eng¬ land has claimed from a very early period; and, more than this, it has long been considered that the common law al¬ lowed persons to enter the lands of another in pursuit of a fox, the destruction of which was presumed to be a public benefit. This opinion was founded on the celebrated case Grundy v. Feltham (1, Term. Reports, p. 334); but in that of Earl of Essex v. Capel, Summer Assizes, 1809, the legality of hunting foxes over the land of another is rendered very questionable. This being the case, it is a great com¬ pliment to the sport, as no doubt injury of land to a certain amount, though small, is occasioned by it, that it is per¬ mitted to the extent to which we see it, in every county in Great Britain ; and that an action of trespass is an unusual occurrence, must be considered as still more creditable to the yeomanry and tenantry who live by the occupation of land. On the other hand, however, it must be remembered, that the produce of land is very considerably enhanced by the great demand, as well as extra prices given, for hay, corn, and straw, as likewise by the encouragement to breed¬ ing horses; and that, wherever there is a colony of fox- hunters, it is accompanied by a great influx of money, which is expended in the immediate neighbourhood. Cecil, in his admirable Records of the Chase, gives it as his opinion that about 15,300 hunters are kept in England and Wales alone, and that, taking the average for the keep of each horse at LAO, no less than L. 120,000 is circulated through the medium of horse and hound annually. The United Kingdom contains about 105 packs of fox and stag hounds, and about 90 of harriers, otter-hounds, and beagles. By far the largest number of packs is kept in Devonshire, but although every one there goes a hunting, it is the worst hunting ground in England, not excepting the Craven, where John W^arde considered that 44 he was sent as a punishment for his sins.” There were formerly three established classes of hunt¬ ing in Great Britain, each of which had advocates, as it may have been suitable to situation, fortune, time of life, &c.; and although the struggle for superiority has ended in favour of that of the fox, we have reason to believe, that since what are termed “packs of hounds have been esta¬ blished, hunting the stag or buck claims precedence of the hare ; the hare of the fox ; the otter, perhaps, of all. We will then offer a few more remarks upon them, as we have ranked them here. Since the stag has ceased to be drawn for, and found in his native majesty, and hunted as a wild animal, “ stag¬ hunting” has lost all its interest with the sportsman; and L' I N G. 39 when we say that the chase of no other animal is, after all, Hunting.^ from first to last, so full of interest as that of the stag, the V ^ v sportsman has some cause for regret. But wild-stag hunt¬ ing could not have remained one of the popular diversions of Great Britain, for two sufficient reasons, t irst, from the country being so generally cleared of wood there would have been a great scarcity of game ; and, secondly, from the circumstance of the stag being, by his nature, unfit to be hunted during some of the months that sportsmen like to be on the field. The act of harbouring the deer, how¬ ever, must be considered as amongst the very highest branches of the sportsman’s art, and one which none but a well-practised sportsman could perform. Neither was the hunting to death of the wild stag by any means so easy a task as might be supposed, from the bulk of the animal, which it must be proportionally difficult for him to conceal. On the contrary, like the harts of Meandros, flying from the terrible cry of Diana’s hounds, the “ wise hart,” or cerf sage, as he is termed in ancient hunting, knows how to foil hounds perhaps as well as, or better than, most other wild animals, and is allowed to consult the wind in his course more than any of them. It is also said of him, that he will, when pursued, rouse other deer from their lair, to induce the hounds to run counter, or change; and his device of taking soil, with nothing but the nose to be seen above the water, or, running down a stream, and seeking for a hard and dry road when pressed, are facts too well established to require comment. There is not a nobler sight in nature than that of a full-headed stag roused from his lair by hounds, and majestically trotting before them, snuffing the air as he goes, and appearing to care little for his pursuers, from con¬ fidence in his natural powers. That these powers are great, all modern stag-hunters are satisfied of; and those of en¬ durance, when chased, are allegorized in the fable of the Maenalaean stag, the running down of which is said to have occupied Hercules for a year, and was in consequence counted amongst the labours of that hero. That deer are superiorly winded animals, is apparent by the immense height they can leap, just before they die from bodily ex¬ haustion. A popular error has attributed this to the exist¬ ence of the fossa lacrymalis, which was supposed to furnish a breathing place at the corner of each eye. Oppian must have supposed, by the following line, that they had Jour ; {< iriffvgis orva/jio'/ ^tccuXoi,” which was a mistake of the sporting bard; and some writers have made Aristotle say, that goats breathed at their ears, whereas he directly asserts the contrary. The classic writers, however, as well as our own poets, have taken some of their most beautiful similes from the chase of the deer; for example, Virgil’s comparing the flight of Turnus to a stag trying to escape from the toils; and the death of the favourite hind by the hand of the young lulus, a master¬ piece of pastoral poetry. But the death of the stag has been a favourite theme of our own poets; and both Shak- speare and Thomson have been equally happy in their de¬ scription of the last moments of the antlered monarch of the forest; the latter particularly: “ He stands at bay, And puts his last weak refuge in despair. The big round tears run down his dappled face : He groans in anguish ; whilst the growling pack, Blood-happy, hang at his fair jutting chest, And mark his beauteous chequer’d sides with gore.” A kind of technological dictionary is required to almost all sports of flood and field. Of the technical terms in deer-hunting Nimrod thus speaks :—“ What we fox-hun¬ ters call the ball or pad of a fox on foot, they term the ‘ slot.’ We drag up to a fox; they draw on the slot, or walk up a deer. We find, or unkennel a fox; they rouse, or unharbour a deer. A fox runs up and down a cover; a 40 H U N r Hunting, deer beats up or down a covert, or a stream. With us, a fox is headed (turned back, or driven from his point); with them, a deer is blanched. W e say, a fox stops or hangs in a cover, in a run ; they say, their game sinks. We recover our fox; they fresh find their deer. We run into (kill) our fox; they set up the deer. The fox is worried ; the deer is broken up. The fox goes a clicketing; the deer goes to rut. The fox barks ; the stag bellows. The bil- liting (excrement) of the one is termed the feument or feumishing of the other. The brush of the fox is the single of the deer. The mask of the fox is the snout or nose of the deer. The view, the foil, the tally-ho, and who-whoop, are common, I believe, to all; but ‘ currant jelly’ and ‘ sweet sauce’ are not in the fox-hunter’s vocabulary.” “ There are some expressions here,” continues Nimrod, “ which re¬ quire farther explanation than I am able to afford them; and it is almost presumptuous in me, without any assistance at hand, to attempt giving an opinion on the subject. The word £ harbour,’ however, is one of common acceptation, and implies a place of refuge. To unharbour a deer has long since been settled by Phny,—‘ Excutere feram cubili.’ The expression is clear, and falls smoothly on the ear. Not so with ‘ taking soil:’ it savours of filth, and is only appli¬ cable, in this sense, to a hog delighting, in the summer months, to wallow in mud or dirty water, previously to going to his bed. To ‘ beat up and down’ is only another way of expressing to run to and fro, and is found in Terence, in the word cursito. The deer being ‘ set up,’ can only be in allusion to his having his throat cut; for Cicero speaks of a man being ‘ set up’ to have that pleasant operation per¬ formed,—‘In cervicibus imponere dominum.’ The stag roused from his lair has certainly a great superiority over unkennelling the fox. The latter is tame and puny, whereas the former is bold and classical, and quite in association with the wildness of the forest, of which this animal is the monarch. The lair is but another word for the den ; as we read in Virgil’s celebrated contrast of a town and country life, in which he so beautifully describes the manly pursuits of the latter; and likewise in the hunting scene with Dido and iEneas. The word feument I never heard before, but conclude it is derived from the Greek word (ftyp/xa, recre- mentum” The following is Nimrod’s description of a full-headed deer:—“ A perfect head, I find, consists of brow, bay, tray, and three on top of each horn; but some have brow, bay, tray, and five on each horn, though these are rare.” Of the powers of endurance of a deer before hounds, as also of his subtlety in foiling them, the same writer thus speaks:—“ When we reflect on the powers of a stag, and look at his qualities for speed, we cannot be surprised that, when not overladen with flesh, or a ‘ heavy deer,’ as he is then called in Devonshire, he should afford some extraor¬ dinary chases. The following well-authenticated facts will speak to their powers of locomotion: ‘ When Sir Thomas Acland kept the hounds, a farmer in the neighbourhood of Holnicote House, saw a stag one evening in his fields, with a particular spot on his side. The next morning he met this same stag running in great distress, with the hounds close at his haunches, and he soon afterwards sank before them. On his asking Sir Thomas where he had found him, he learnt that it was 25 miles, as the crow flies, from the place where he was killed. He must therefore have travelled that distance in the course of the previous night.’ ” Again, on the power of leaping, which we have already noticed, and particularly in allusion to their wind, when otherwise much distressed, we find the following remark:—“ On my return from hunting on the preceding Tuesday’s hunting,” says Nimrod, “ I was shown a leap, in Lord Fortescue’s park, which a hind had taken last season before this pack, after a long run, and not ten minutes before she sank be¬ fore them. What makes it more extraordinary is, that, on ' I N G. being paunched, a calf was taken from her almost able to Hunting stand. The fence was a stone wall, with a rail on the top of it, not to be broken ; and your readers may judge of its height from the following statement, having had no other means of measuring it: My own height is 5 feet 9 inches; the horse I rode is 15 hands 2 inches high; the top of the fence was upwards of 2 feet above the crown of my hat; and it was up a steep bank that she approached it. The stag we ran went up to this fence, but did not attempt to leap it.” From the adverse circumstances attending it in a country like Great Britain, so generally free from large tracts of woodlands, which the red deer delights in, and also so much intersected with streams, real stag-hunting can never be again reckoned amongst the popular diversions in England, a good substitute for it is found in the turning out deer be¬ fore fox-hounds in the neighbourhood of the metropolis, which has the advantage of affording a certainty of some¬ thing in the shape of a run, and frequently very long ones, to persons whose time is precious, as well as the opportunity of, in a great measure, selecting the country best suited to the habits and propensities of the game. There are a num¬ ber of stag-hunting establishments in England, and there has been a royal establishment of this nature throughout several successive reigns. In that of George III. stag¬ hunting was in high repute amongst the nobility and gentry forming the court, as well as of others residing in its neigh¬ bourhood. Mr Beckfbrd said little about it, because he knew little : the reason he himself gives ; but the following expression in his book relating to it made a deep impression on fox-hunters, who reluctantly acknowledge its truth:— “ Could a fox-hound,” says Mr Beckford, “ distinguish a hunted fox, as the deer-hound does the deer that is blown, fox-hunting would be complete.” The roe-buck has partaken of the same respite from the chase as the wild red deer, although by the old laws of the forest he was not considered as venison until hunted; and, according to Caesar, the Britons did not eat this animal at all. The fact is, the roe-buck runs so short, after the first ring, that he is said to hunt the hounds, instead of the hounds hunting him; an artifice by which he hopes to elude his pursuers, as, of course, it must produce a confusion of scents. Neither does his cunning end here. When closely pursued in a thick wood, he will bound to one side of a path by a sudden spring, and, lying close down upon his belly, permit the hounds to pass by him without offering to stir. But the beauty of form and elegance of motion of the “ fa¬ vourite roe” ought to protect it from the chase. There has been only one pack of roe-buck hounds kept in Great Bri¬ tain, and that was by a gentleman of the name of Pleydell, of Whatcombe House, near Blandford, Dorsetshire, lately deceased, in whose covers these animals abounded, as they also do in various parts of Scotland. Hunting the ottei' was a sport much thought of in Eng¬ land, and is of very early date, chiefly perhaps for the great value set on fresh-water fish. The system of hunting the otter is this: The sportsmen go on each side of the river, beating the banks and sedges with the hounds. If there be an otter near, his “ seal” (foot) is soon traced on the shore; and, when found, he is attacked by the sportsmen with spears, when he “ vents,” that is, comes to the surface of the water to breathe. If he be not soon found by the river side, it is conjectured he is gone to “ couch” inland, for he will occasionally go some distance from his river to feed. He is traced by the foot, as the deer is; and when found, and wounded in the water, he makes directly for the shore, where he maintains an obstinate defence. He bites most severely, and does not readily quit his hold; on the con¬ trary, if he seizes a dog in the water, he will dive with him to the bottom of the river, and will never yield to him whilst he has life. This sport is still pursued in the few HUNTING. Hunting, fenny and watery districts that now remain in England, and whas for a long time been confined principally to those parts where, from local circumstances, the other more noble and exhilarating distinctions of the chase cannot be conveniently enjoyed. An attempt, however, was at one time made to revive it, by an Oxfordshire sportsman, Mr Peyton, only son of Sir Henry Peyton, Bart., of which an account may be found in the Oxford Journal. By this, two facts were established; the one, that otter-hunting spiritedly pursued is not a tame diversion ; and the other, that the charge against this animal of destroying young lambs and poultry, is not altogether unfounded. The otter-hound is not a distinct kind of hound, the strong rough-haired harrier answering the purpose best, provided he will hunt a low scent, as the game shows no small sagacity, as well as circumspection, in guarding against assault from man or dog. In 1796, on the River Worse, near Bridgenorth, Shropshire, four otters were killed, one of which stood three, another four hours before the hounds; and in 1804 the otter-hounds of Mr Coleman of Leominster, Here¬ fordshire, killed an otter in a mill pond, which is said to have weighed thirty-four pounds and a half; supposed to have been eight years old, and to have consumed a ton of fish or flesh annually, for the last five years. They often destroy much more than they consume, for they will go on killing when their prey is plentiful, eating only a small portion of each fish. Mr John Dixon lately imported some Durham otter-hounds to Canada, and we hear that they are generally considered to be better adapted for bear-hunting than any description of dog which has yet been sent over. Hare-hunting claims precedence of fox-hunting in the sporting chronology of Great Britain, and we believe of all other countries, inasmuch as a hare has always been esteemed excellent eating, and a fox the rankest of carrion. We gather from Xenophon that it was practised before his day, and he wrote fully upon it above three centuries before Christ; both hounds and nets being then used in the pursuit. Neither can we marvel at hare-hunting being the favourite diversion in all nations given to sporting where the use of the horse in the field had not become common. But we will go a point farther than this, and assert that, how inferior soever may be the estimation in which hunting the hare is held in comparison with hunting the fox, no animal of the chase affords so much true hunting as she does, which was the opinion of the renowned Mr Beckford. In our description of the modern harrier (see article Hound), we have termed him the fox-hound in miniature; and we may apply the simile to hare-hunting, which now, as long as the chase lasts, greatly resembles fox-hunting, only on a minor scale. In the modern system there is no tracking to the seat with the one, any more than dragging up to the kennel with the other; but both animals are now chiefly stumbled upon by accident, and instantly fly for their lives. With the system of hunting also has the kind of hound been altered; there being now no longer occasion for that nice distinction of scent which was wanting to be a match for the windings and doublings a hare was able to make in her course when hunted by the slow and fastidious southern hound, and which was essential to the finding her at all, in countries where hares were scarce, by the perplexing means of a very cold trail. In proof of our assertion, that there is more of true hunt¬ ing with harriers than with any other description of hounds, w'e shall point out a few of the difficulties which they have to overcome. In the first place, a hare, when found, generally describes a circle in her course, which is in itself not only more difficult to follow, but it naturally brings her upon her foil, which is the greatest trial for hounds. Secondly, the scent of the hare is weaker than that of any other animal we hunt; and, unlike some, it is always the worse the nearer she is to her end; which accounts for its being better, and VOL. XII. lasting longer, when going to her seat, than when running Hunting^ There is scarcely any scent from a hare until she is in mo- tion; therefore hounds constantly draw over her; and, of course, according to the length of time she has been gone to her seat after feeding, will be the difficulty of hunting her by the trail. In fact, at the most distant part of her previous night or morning’s walk, the most tender-nosed hound in a pack will be scarcely able to own the scent at all. But the grand puzzler of all is, when hounds get upon the counter trail, about the middle of a hare’s work, and the scent lies so equal that it is most difficult to distinguish heel from chase. No such difficulty as this can occur in any other description of hunting, and can only be obviated by the skill and experience of the huntsman in his notice of the working of his hounds. But although this difficulty is alluded to by almost all writers on the chase, we know not where to look for directions to the huntsman at the critical moment. It is true, Mr Daniel, in his Rural Sports, says, “ To find out this, see if your hounds challenge counter; if they double and carry it on counter, they will soon signify their error by opening singly.” We conceive there is some reason in this remark, but it will not always avail. Hounds, harriers in particular, are fond of a scent; and if they cannot carry it forward, they will turn and hunt it heel; and here it is that the judgment of a huntsman turns to account. One with a keen eye, and a perfect knowledge of Ins hounds, may be able to unravel this mystery perhaps six times out of ten; but it is in no man’s power to be sure of doing it. His chief guide is in the cry of his pack at this time, which will slacken instead of getting fuller if the scent be heel, as the experi¬ ence of old hounds adds to their natural instinct the faculty of judging whether it is leading them to their prey or from it. The great perfection of modern harriers is the head they carry over a country, the result of the pains now taken in breeding them of the same size and character; whereas, upon the old system, which was all for the pot, the chief de¬ pendence was upon a few couples out of the whole pack, the rest being wheresoever they liked or were able to be in the chase. On the other hand, it may be said modern har¬ riers have not the nose and patience of the old sort, which perhaps they have not; but what they may lose in those respects they more than gain in another, viz., by being nearer to their game in chase, and, by pressing her, not allowing her to make more than halt the work she was able to do when pursued by slow hounds. In fact, the want of speed, and tedious exactness, of the southern hound, ren¬ dered the warmest scent, after a short time, cold; which may be proved from the fact of an hour being the average time of killing a hare, in former days, with a good scent; and from three to four with what is called a “ fair,” a “ hold¬ ing,” or a “ half scent.” For our own part, speaking as fox- hunters, yet abandoning all prejudices against a sport it is too much the fashion to hold cheap, we consider that, to any man who is a real lover of hunting, that is, of seeing hounds do their work, and do that work well, a twenty minutes burst over a good country, with a well-bred pack of harriers of Dae present stamp and fashion, affords a high treat. To see them to advantage, however, it should be over a country in which the fields are large, and the fences stone walls, like those of Oxfordshire or Gloucestershire ; for harriers, being for the most part obliged to meuse, strong hedges prevent their carrying a head in chase, which is the chief beauty in all hunting. Somerville has these appropriate lines on the adaptation of hounds to their game :— “ A different hound for every chase Select with judgment; nor the timorous hare O’ermatched, destroy; hut leave that vile offence To the mean, murderous, coursing crew, intent on blood and spoil.” Harriers should not be too large, certainly not more than F HUNTING. 42 Hunting. 18 inches high, or, by their speed, and, if good withal, they ^ will much overmatch their game ; but in a good and open country there should never be less than from eighteen to twenty couples in the field. A strong pack not only adds to the respectability of the thing (at all events, a small one greatly detracts from it), but, in our opinion, more hounds are wanting to pursue an animal that runs short, than one which, like the fox, generally makes for a distant point. The opinion of Mr Beckford is in opposition to us here. He says, “ the fewer hounds you have, the less you foil the ground, which you will find a great hindrance to your huntingbut it must here be remarked, that in the pre- cedino- sentence this eminent sportsman speaks of the diffi¬ culty'of getting a strong pack of harriers to run well to¬ gether, a'difficulty which no doubt existed in his day, but is totally overcome in the best hare-hunting establishments of ours. Indeed, we once heard a sportsman declare, and he was a sportsman who had hunted in all the best countries in England, that he had never seen a chase quite complete from end to end, not a single hound being out of place, until he saw it with a pack of harriers over the Cotswold Hills. The following passage from Beckford is worthy of his pen, and should be strictly observed by all masters of har¬ riers ;—“ Harriers, to be good, must be kept to their own game. If you run fox with them, you spoil them. Hounds cannot be perfect unless used to one scent and to one style of hunting. Harriers run fox in so different a style from hare, that it is of great disservice to them when they re¬ turn to hare again. It makes them wild, and teaches them to skirt. The high scent which a fox leaves, the straight¬ ness of his running, the eagerness of the pursuit, and the noise that generally accompanies it, all contribute to spoil a harrier.” We conclude that the writer here alludes to hunting wild foxes, which is now very rarely done with a pack of harriers, at least in a country near to which fox¬ hounds are kept. No master of harriers would do it, who wishes his pack to be perfect: and there are other reasons for his not doing it, which it is unnecessary to mention. But the very best understanding now generally exists be¬ tween masters of fox-hounds and masters of harriers; and it is a common practice of such of the latter as reside in a fox-hunting district, to await the publishing of the fox¬ hunting fixtures before they make their own. The following hints may be useful in hunting the hare. First, respecting the hare herself:—Hares breed from Feb¬ ruary to the end of harvest, and are said to live seven years. The buck affords the best sport, particularly in the spring, when, after one or two rings, he often goes straight on end for several miles. Hence the proverb, “ as wild as a March hare.” Some persons pretend to distinguish the sex upon the seat; at all events, the head of the buck is shorter', the shoulders redder, and the ears redder, than those of a doe; he is also larger, and his hind parts are of a lighter colour. If the claws are smooth and sharp, and the ears tear easily, the hare is young. The difficulty of finding a hare by the eye is well known. It is an art greatly facilitated by experience, although not one person in ten who attempts it succeeds in it. But here we recognise the Hand that furnished her with such means for her security; as, from the delicacy of her flesh, she is the prey of every carnivorous animal, and her means of defence are confined only to her flight. In going to her form, she consults the weather, especially the wind, lying always, when she can, with her head to face it. After har¬ vest, hares are found in all situations; in stubble fields, hedgerows, woods, and brakes; but when the leaves fall, they prefer lying upon open ground, and particularly on a stale fallow, that is, one which has been some time ploughed; as likewise after frost, and towards the spring of the year. In furze or gorse, they lie so close as to allow themselves nearly to be trodden upon, rather than quit their form. The down or upland bred hare shows best sport; that Hunting, bred in a wet, marshy district, the worst, although the scent from the latter may be the stronger. If a hare, when not viewed away, runs slowly at first, it is generally a sign that she is an old one, and likely to afford sport; but hares never run so well as when they do not know where they are. Thus, trapped hares, turned out before hounds, almost invariably run straight on end, and generally till they can run no longer; and they generally go straight in a fog. The chase of the hare has been altered, and rendered less difficult in some degree, by the improvement of the hound used in it. In the first place, she is now so pressed by the pace at which she is hunted, that she has not time, when first started, to visit the works of the preceding night; nor is she, from the same cause, so likely to run her foil. But when making out her foil, hounds are not let to puz¬ zle over it now as formerly, but, if it be not quickly done, are rated forward by a whipper-in, to make good the head, and if that do not succeed, to make it good round the fences. Formerly, when hounds were at fault, the cast was made in a small circle to begin with, and then their huntsman tried wide ; whereas they now generally, and especially if the game is supposed to be not far before them, make a wide cast at first, and then contract the circle if the wide cast fails. There is reason in this ; for if the hare is on, the wide cast will cross her; and if she is not, she has most likely squatted. The old system was, “ avoid a view, if possible.” The modern one rather encourages a view, but no halloaing: for as hares regulate their speed in great measure by the cry of hounds, they are less apt to have recourse to shifts when the cry bursts upon them at once. In fact, to suit the taste of the day, which is to have every thing that moves fast, it was necessary that the greater part of the system of hunting the hare should be changed. It used to be insisted upon, that harriers should never be lifted as long as they can possibly carry a scent; and Beckford says, “ a hare is not fairly hunted unless the pack be left almost entirely to themselves ; that they should follow her every step she takes, as well over greasy fallows as through large flocks of sheep; nor should they be cast but when nothing can be done without it.” This may have been all very well when gentlemen followed hounds on foot, or were content to be some hours killing one hare; or for Mr Beckford himself, who (although he admits hav¬ ing bred an infinity of harriers before he could get a pack to please him) thought hare-hunting should be taken as a ride after breakfast, to get an appetite to dinner. But we have reason to believe, if a master of harriers of the present day wished to show his pack to advantage, and could have a choice of a run to display them, he would say, “ Give me twenty-five minutes in all; the first fifteen a severe burst; then a fault, well hit off; and the remain¬ ing ten without a turn.” But, it may be asked, wherefore the fault? We reply, because, although the speed of well-bred harriers, for a certain time, if not quite equal to that of fox-hounds, is too much for most hares, as well as for most horses that follow them, yet, after that certain time, say fifteen minutes, wind and power begin to fail, and a short check is useful. Besides, the ability of a pack, in quickly recovering a fault, is more than a counterbalance to their coming to a fault at all, which, with a short run¬ ning animal, as the hare is, it is often difficult to avoid, nay, rather to be looked for indeed in every field. The difference in the terms used in hare-hunting and fox-hunting is comprised in a few words:—Harriers are cast off in the morning ; fox-hounds throw off. The hare is found by the quest or trail; the fox by the drag. The hare is on her form or seat; the fox in his kennel. The young hare is a leveret; a fox a year old is a cub. The view holloa of the hare is, “ Gone away ;” of a fox “ Tally- ho.” The hare doubles in chase; the fox heads back, or HUNTING. 43 Hunting, is headed. The harrier is at fault; the fox-hound at check. . The iiare is pricked by the foot; the fox is balled or padded. The hare squats; the fox lies down, stops, or hangs in cover ; the “ who-whoop” signifies the death of each. Our ideas of a complete pack of fox-hounds are very soon expressed. For four days’ hunting in the week there should be not much less than sixty couples of working hounds; nor do we think more are necessary, as hounds, like horses, are always better and sounder when in regular work. For three days in the week, forty couples are enough. They should have at their head not only a hunts¬ man, but also a master, each of whom knows his business, and one clever whipper-in, and another as clever as you can get him. It is not necessary, because it is not feasi¬ ble, that they should all be good drawers of covers ; but it is absolutely necessary to perfection that they should all get to work as soon as a fox is found, and prove themselves true on the line their game has gone. As to their being quite free from riot on all days, and on all occasions, the man is not yet born who can say with truth, “ my hounds never run riot.” Nature is seldom extinguished; and as iEsop’s damsel, turned to a woman from a cat, behaved herself very well till the mouse appeared, so will hounds occasionally break away upon riot, particularly when out of sight of the servants, in large covers, or when disappointed by a long blank draw. We conceive a pack of fox-hounds entitled to be called “ steady from riot,” if they will bear being put to the following test:—If, when at fault for their fox, in the middle of a large field, a hare gets up in view, and not a hound stirs, nor attempts to break away after her; and this without a word being said to caution them. But it is in chase, with only a holding scent, that a pack of fox-hounds display their excellence. In such a case as this there must be checks; and it being ten to one against their fox running straight, because they cannot press him, now is the time to see them work. Do they carry a good head when the scent is a-head, and serves them well ? Are they cautious when it does not? And do they turn short when the game has turned right or left, or is gone back? Are they careful not to overrun the scent, and will they stand pressing to a certain degree by the horse¬ men ? But having overrun it, do they stop directly, and make their own cast? Should that fail, do they come quickly to horn or holloa—to their huntsman’s cast ? Do they fling for a scent when their huntsman lifts them to points, and not attempt to Jlash, or break away, without a scent? When the scent serves well, do they not only carry a good head over a country, but, as their game is sinking, does the head become better ? If they do all this, and have speed and stoutness withal, they are equal to any fox in any country, and are worth a thousand sovereigns to' a sportsman. The number of fox-hounds taken into the field depends chiefly upon country; more being required in that which is woodland, than for an open champaign, or for our in¬ closed grass districts, such as Leicestershire. Eighteen couples are generally considered as sufficient for the latter; and the strongest woodlands do not require more than from twenty-two to twenty-five couples ; and we consider the latter the more common number, in the field, of any pack in any country. The average speed of fox-hounds is estimated at ten miles, point blank, over a country, with a good scent, in one hour ; that is to say, making allowance for deviations from the straight line, hounds seldom go more than ten miles, from point to point, in that space of time. Mr Beckford has a very judicious remark on this part of his subject. “ That pack,” he writes, “ may be said to go the fastest that can run ten miles the soonest, notwithstanding the hounds separately may not run so fast as many others. A pack of hounds, considered in a collective body, go fast in propor¬ tion to the excellence of their noses and the head they Hunting, carry ; as that traveller gets soonest to his journey’s end who stops least upon the road. Some hounds that I have hunted with would creep all through the same hole, though they might have leaped the hedge ; and would follow one another in a string, as true as a team of cart-horses. I had rather see them, like the horses of the sun, all abreast.” There is nothing in the history of our domestic sports and pastimes to inform us correctly as to the date of the first regularly-established pack of fox-hounds kept in Eng¬ land. Neither the holy prioress of St Alban’s, Dame Ju¬ liana Berners, Markham, nor any of the very old writers on such subjects, are able to satisfy us on this point; but, on the authority of the Rev. William Chafin, in his Anecdotes respecting Cranbourn Chase, the first real steady pack of fox-hounds established in the western part of England was by Thomas Fownes, Esq. of Stepleton, in Dorsetshire, about the year 1730. “ They were,” says the author, who wrote in 1818, “as handsome, and fully as complete in every respect, as the most celebrated packs of the present day. The owner, meeting with some worldly disappointments, was obliged to dispose of them; and they were sold to Mr Bowes, in Yorkshire, the father of the late Lady Strath¬ more, at an immense price for those days. This pack was probably the progenitors of the very fine ones now in the north. Before this pack was raised in Dorsetshire, the hounds which hunted in the chase hunted all the animals promiscuously, except the deer, from which they were ne¬ cessarily made steady, otherwise they would not have been suffered to hunt at all in it.” Lord Yarborough’s fox¬ hounds, at Brocklesby Hall, Lincolnshire, have been esta¬ blished for upwards of 170 years, and the Smitts have hunted them for several generations. The Fox. The fox makes a conspicuous figure in the natural history of animals; still, in some 1'espects, his character has been overrated and exaggerated. He is a native of all temper¬ ate regions; and although we read of the cur, the grey¬ hound, and the mastiff fox, we consider a fox as a fox, the difference in size, colour, &c., being dependent on either climate or food. It is true, they are larger in some particu¬ lar parts of England than in others; and it is generally be¬ lieved, that such as are what sportsmen call “ stub-bred foxes,” that is, bred above, and not below ground, are the largest. It is in this sole instance that the habits of the fox differ from those of the wolf, to whose genus he belongs ; the she wolf never bringing forth her young, as the fox does, under ground. But although the general conforma¬ tion of the fox is the same as that of the wolf, his external form has a greater resemblance to the dog, with whose cha¬ racter also he closely assimilates, when domesticated, in ex¬ pressions of affection, of anger, or of fear. When minutely examined, and particularly in relation to his predatory life, and, consequently, the dangers to which he is exposed, he will be found to be abundantly endowed by nature with the instinctive faculties requisite for such a life, in addition to the most elegant form an animal of his size is capable of. Foxes copulate in the winter months, and of course bring forth in the spring, on an average perhaps half a dozen cubs at a littei’, born blind like the dog; but the period of each depends on the mildness or severity of the winter. Ex¬ cepting during the season of sexual desire, the fox is a soli¬ tary, not a gregarious animal, for the most part passing the day in sleep, and the night in prowling after food. The food of the fox is extremely variable ; indeed, very few things that have or have had life come amiss to him ; but we have reason to believe that rabbits, hares, poultry, partridges, and pheasants, with their eggs, are his favourite repasts; and when these are not to be had, he contents 44 HUNTING. Hunting, himself with field-mice, black-bettles, snails, and frogs. ' That he can even exist solely on the latter, was proved a few years ago, bv the circumstance of a iox-hound and a fox having been found at the bottom of a dry well, into which they had fallen ; the hound had perished from hunger, but the fox had supported his life on frogs. Of those ani¬ mals and birds which we call game they are without doubt destroyers—of pheasants, it is asserted, twenty-five per cent.; but how it happens that they have been charged with’feeding on grapes, we are, as far as our own experi¬ ence directs us, quite at a loss to determine. The tact, however, is stated by several accredited writers, and has o-iven birth to the fable of the fox and the grapes, the mo¬ ral of which is a severe rebuke to an envious person who “ hates the excellence he cannot reach.” Aristophanes, in his Equites, compares soldiers devastating a country to foxes destroying a vineyard ; and Galen (Z)e Aliment., lib. hi., c. 2) tells us, that hunters ate the flesh of foxes in autumn, because they were grown fat with feeding on grapes. I here are also two lines in Theocritus {Idyl. E. v. 112) which admit of the following version :— T hate those brush-tailed foxes, that each night Spoil Micon’s vineyards with their deadly bite. He is likewise accused of eating human flesh, and, we have reason to believe, accused justly. In addition to the sen¬ tence pronounced by David, in the sixty-third psalm, that the enemies of God and himself should be a portion for foxes,” we have the following interesting historical anec¬ dote. When the famous Messenian general Aristomenes was thrown into the Caeadas (a deep chasm into which cri¬ minals were hurled) by the Lacedaemonians, his life is said to have been preserved by following a fox that was feeding on a dead body, to the aperture at which he had entered, and through which, after enlarging it with his hands, he himself escaped. But although the subtlety of the fox has been proverbial from the earliest times ; so much so, that our Saviour him¬ self called the tetrarch Herod “a fox,” by way of signify¬ ing the refinement of his policy; we do not perceive that, with the exception of a timid prudence on breaking cover, he shows more sagacity in his endeavours to baffle his pur¬ suers than the hare is known to do, if indeed so much. To “ catch a weasel asleep,” is a typical designation of an im- possiblity ; but foxes are frequently surprised in their naps by hounds drawing upon them, up wind, particularly when gorged with food. In the faculty of natural instinct, how¬ ever, they are equal to the dog; there being well-attested instances of their being sent, marked, upwards of fifty miles in a bag, and, having escaped being killed by hounds before which they were turned out, being retaken in their native woods. One was marked and sent down from Whittlebury Forest behind the venison-cart, when the Duke of Grafton s hounds were kept at Croydon, and it found his way back the seventy miles, no less than three times, before it was run into. But it is in his last moments, when seized by hounds, that the superiority of character in the fox over the hare exhibits itself. He dies in silence; but he sells his life dearly; for, revengefully seizing upon the first hound that approaches him, he only relinquishes his hold with the last gasp. When first the fox was hunted in Great Britain, he was considered merely as a beast of prey, and killed in any way in which he could be got at, generally by being caught in nets and pitfalls, or killed at earth by terriers; his scent not being considered favourable to hounds by our forefa¬ thers. Although they admitted it to be hotter at hand than that of the hare, their favourite object of pursuit, they believed it to be sooner dissipated ; but perhaps the real cause of their objection was, in the general inequality of speed and endurance in the hounds of their days and in a really wild fox; and foxes then were undoubtedly stouter, and able to run much greater distances from point to point, than they now do, when they have comparatively so short a distance to travel for their food, as well as being often over-fed. These animals, then, being always destroyed when an opportunity offered, were of course generally scarce; which, added to the great extent of woods and other fastnesses with which England then abounded, ac¬ counts for the fact of hunting the fox, unless as a beast of prey, not being in vogue until these objections were re¬ moved. But the fox was ever considered as a mischievous animal, and, in one signal instance, is said to have been made an engine of mischief to a vast extent, in carrying fire and flame into the standing corn of the rebellious Phi- Hunting. listines. As the preservation of the fox is now more an object in Great Britain than his destruction, it may not be amiss to observe, that a few links of an iron chain, such as an old plough-trace, or a small piece of red cloth, suspended near to the spot on which a hen-pheasant sits, is a certain pro¬ tection from foxes, of herself, her eggs, or her brood, inde¬ pendently of her losing her scent, by a wise provision of Providence, during the incubation. It is also asserted by sportsmen of experience, that the scent of foxes varies with the animal; and that a vixen fox which has laid up (brought forth) her cubs is nearly devoid of scent. Huntsman. “ A good huntsman,” says Beckford, “ should be young, strong, active, and bold ; fond of the diversion, and inde¬ fatigable in the pursuit of it; he should be sensible and good tempered; he ought also to be sober; he should be exact, civil, and cleanly; he should be a good horseman, and a good groom; his voice should be strong and clear, and he should have an eye so quick as to perceive which of his hounds carries the scent, when all are running; and should have so excellent an ear, as always to distinguish the foremost hounds when he does not see them. He should be quiet, patient, and without conceit. He should let his hounds alone when they can hunt, and he should have genius to assist them when they cannot. It is scaicely necessary to observe, that Mr Beckford is here speaking of a huntsman to fox-hounds, his demands on the hare-hunter being somewhat more moderate; and yet the difficulties he has to combat with are more than obscurely acknowledged. Aware that practice is the key to excellence in eveiy art, and that experience is the great mistress of all human know¬ ledge, he requires age, with its experience, to fit the hare- huntsman for his office, and to be a match for the wiles of the hare ; very ludicrously adding, that, for patience, he should be a very Grizzel.” We do not think we exaggerate when we say, that the picture here drawn of a clever huntsman may, in one de¬ gree (of bodily endowments at least), be termed a near ap¬ proach to human perfection ; nor do we hesitate in adding our conviction, that if to the attributes here given him are joined a comprehensive mind and a humane heart, nothing is wanting to make it complete. As the chase is said to be the image of war, “ but without its guilt,” let us suppose Mr Beckford had been drawing the character of a soldier, and not a huntsman. Could he have given him higher qualifications than a clear head, nice observation, a good constitution, undaunted courage, a powerful voice, an accu¬ rate ear, and a lynx’s eye, together with a quick perception, endowed with quick impulses for acting, so necessary to each ? That he should be “ fond of his profession,” and “ indefatigable in the pursuit of it;” “sober ” and “ exact,” “ sensible and good tempered T It is not necessary that either a huntsman or a soldier should be a man of letters ; some of the best among the former have been scarcely HUNTING. Hunting, able to read; and there have been but few Caesars who could fight and write; but a good understanding is put to the test by both the one and the other; and although we do not mean to place the servile situation of a huntsman on a level with the honourable profession of the soldier, each requires, in a high degree, a good, sound understanding, and a manly exertion of talent. But the office of huntsman to fox-hounds is not always intrusted to servile hands. It has long been the ambition of masters of packs to hunt their own hounds ; and although the fashion has become more prevalent within the last thirty years than it was in the earlier days of fox-hunting, yet we could bring forward some instances of what are called gentle- men-huntsmen of pretty long standing. His Grace the Duke of Cleveland, and Sir Richard Puleston, Bart., each hunted his own hounds for nearly forty years ; and the late William Leche, Esq. of Carden-Hall, Cheshire, was his own huntsman for an equally long period. Coming next to them in chronological order, stand Messrs Ralf Lambton, Musters, Thomas Assheton Smith, Lord Fitzhardinge, Sir Bellingham Graham, Bart., Mr Osbaldeston, Mr Nicoll, the Earl of Kintore, Mr Smith, late of the Craven, Sir Richard Sutton, Mr Baker, Mr Arkwright, the Honourable Grant- ley Berkeley, and several others. There can be no doubt that no man enjoys hunting to perfection equally with him who hunts his own hounds; nor can there be any reason assigned why an educated gentleman should not excel, in any ardent and highly scientific pursuit, an uneducated ser¬ vant ; nevertheless, we do not think that, throughout the fox-hunting world in general, gentlemen huntsmen have been so popular as might have been expected ; and in some countries that are hunted by subscription, an exception is taken against the master of the pack being the huntsman. That it is a very laborious office when efficiently executed, both in the kennel and the field, is well known to those who have filled it; but, labor ipse voluptas, we have seen a painstaking zeal displayed in the master which we have too often seen wanting in the servant; and we could name a nobleman who used frequently to tell his huntsman, when drawing for his second fox, that he was “ thinking more of his dinner than of hunting.” In the earliest days of English hunting, gentlemen hunts¬ men were in high estimation ; and a reference to Domesday Book will show that Waleran, huntsman to William the Conqueror, possessed no less than fifteen manors in Wilt¬ shire, eight in Dorsetshire, together with several in Hamp¬ shire ; and his name occurs on the list of tenants in capite in other counties. The same venerable record of antiquity describes the extensive possessions of other huntsmen, bear¬ ing the names of Croc, Godwin, Willielmus, gentlemen of consideration in those times, in which, according to Frois¬ sart, the ardour of the chase was carried to a pitch since unequalled by the Norman lords, some of them having kept sixteen hundred dogs, and a proportionable number of horses for the chase.1 But we may go still farther back, to a very barbarous age, for the respect in which huntsmen have been held by kings and legislators. The temperate but brave Agesilaus, and even the luxury-destroying Ly- curgus, provided for the bountiful entertainment of their huntsmen on their return from the chase ; a pursuit which they believed to be so agreeable to the gods, that they offered the first fruits of their sports to Diana. The Duties of a Huntsman. The situation of huntsman to a pack of fox-hounds is one of great responsibility, and, if the breeding as well as hunting of them be left to him, a very arduous undertak- 45 ing. Nor does it end here. There is great call for judg- Hunting, ment in feeding hounds to answer every purpose, such as long draws, severe days, and at the same time to go the pace without showing distress, and to come home at night with their sterns up, and looking fresh. Here variety of constitution increases the difficulty ; for, to please the eye, hounds should look level in their condition, as well as even in point of size. One hound will not bear to have his belly more than half filled ; another will not fill his when he may ; and still each must be made equal in strength and wind to the other, to stand hard work and go the pace without dis¬ tress. A huntsman must have a very watchful eye over their condition, which will be effected by work and wea¬ ther ; and he must be pathologist enough to foresee and provide against the alterations which such circumstances produce. He has need also to be a physiologist, to enable him to exercise a sound judgment in breeding his hounds after a certain form and fashion, which are absolutely essen¬ tial to their doing well, and at the same time pleasing the eye. Then look at him in the field, with a hundred eyes upon him, and a hundred tongues to canvass all his acts. Here he should be a philosopher. In the Field. A huntsman is expected to bring his hounds to the cover side in a high state of condition, at all seasons of the year. They should be seen quietly grouped about his horse’s heels, when he is waiting for the hour of throwing off, without a whip stirring, or even an angry word said to them. This is a time when they are often subject to the inspection of strangers, and a first impression goes a great way. When the master gives the word to draw, they should approach the cover at a gentle trot, one whipper-in riding in their front; and when within about a stone’s throw, they may dash into it with as much spirit as they like. Not a word need be said by way of caution, unless it appears to be especially called for, when “ gently, there,” by the first whipper-in, and one smack of his whip, will ge¬ nerally have the desired effect. But we like to see the huntsman alive at this moment, as well as his hounds. Homer compares hounds cheered by their huntsman, to troops encouraged by a skilful general; and doubtless there is a similarity in the effect. Putting hounds out of the question, there is something very cheering to the field in the “ cheering holloa” of a huntsman, when encouraging his hounds to draw ; and it also answers two good purposes. Should a hound get wide off the pack, or hang behind in the cover, or should any of the field be at a loss, which often happens in woodlands, the “pipe” of the huntsman is an unerring guide to all. How necessary is it, then, at all events how desirable, that, like Ajax, he should be @or)v ayaOo's, “ renowned for the strength of his voice,” and, we may add, for the melodiousness of it. He should likewise blow a horn well; and if he varies the blast, to make him¬ self more intelligible to his hounds, he will find his advan¬ tage in it. We wonder this is not more practised than it is. Independently of the common recheat, why not have the “ view horn” as well as the “ view holloa?” But too much horn, like vox et prceterea nihil, is bad, making hounds apt to disregard it; yet a huntsman would be sadly at a loss without it, not only in getting hounds away from cover and in chase, but in drawing large covers, in which they will occasionally get wide. Here a twang of the horn saves a huntsman’s voice in bringing them over to him. One short blast is sufficient. . . . . “ He gave his bugle-horn a blast, That through the woodlands echoed far and wide.” 1 See Froissart, tom. iv.} c. 27. 46 HUNTING. Hunting. The following observations on holloaing are from the pen of an old sportsman. They contain hints that it won d often be advisable to profit by ; and they apply not only to huntsmen, but to the field. “ A general rule as to hallooing is, never to halloo unless you can give a good reason for so doing. A constant and indiscriminate use of the voice is blameable in a huntsman ; his hounds, by con¬ stantly hearing his voice, will soon learn to pay no more attention to it than they do to the singing of the lark, and they will not come to him when they are called, borne huntsmen, in making a cast, try that part of the ground where they can most conveniently ride, instead of that where it is most likely the fox is gone. Others ride on hallooing, without regarding their hounds, while making their cast; their own noise then prevents them from hear¬ ing their hounds, who often take the scent without their being aware of it.” “ No person should halloo that is not wrell forward. It signifies little what words you use, as a hound’s knowledge of language is confined to a view halloo, a call, and a late , it is the tone of the voice, and not the words, that they understand; and hounds will always draw to the voice, if it be not a rate. This shows the impropriety of hallooing behind hounds. In running with good scent, if you are up with the pack, a cheering halloo does no harm ; the hounds will not attend to it, and it is expressive of the pleasure of the hallooer. Never cap hounds with loud hal- loos to a bad scent; capping makes them wild and eager, and should never be done but when the scent is high. Hounds should be brought up gently to a cold scent.” Holloaing to hounds is often necessary, and highly^useful when done with judgment; but the word “ tallyho loses many a good run ; as, unless a fox is gone clear away from his cover, it occasions him to turn back often into the mouth of the hounds. Dog Language. It is true, no correspondence can subsist between beings whose natures are separated by a chasm so wide as that be¬ tween rational and irrational animals ; and it is with a view of adapting our meaning to the level of their understand¬ ings, that we generally address or converse with brutes in a silly unmeaning manner; which gave rise to the remark, that children, or men who act like children, have animals more immediately under their control than the philosopher who is replete with wisdom. But we may look farther into the subject than this. If the Almighty had not manifested some portion of his attributes by means which are on a level with the capacity of the human race, man must have remained for ever ignorant of his Maker. The power of language, however, between man and man, is prodigiously increased by the tone in which it is conveyed. The va¬ grant when he begs, the soldier when he gives the word of command, the senator when he delivers an oration, and the lover when he whispers a gentle tale to his mistress, all dif¬ fer in the key in which they speak; and it is thus that huntsmen and whippers-in make themselves intelligible to hounds. They do not speak to them in an unmeaning manner, or after the manner of children ; but in short and pithy sentences, every word of which is law. The method of doing this, however, admits of several degrees of excel¬ lence ; but the huntsman who is endowed by nature with a clear, sonorous voice, in a well-pitched key, and knows when to use it with effect, contributes greatly to the enthu¬ siasm of fox-hunting, and no doubt to the success of it. Gelert, in his Hounds of England, speaks of the master of Langilly hounds (Mr J. Williams) as one whose “ dog lan¬ guage in cover-drawing is particularly good and melodious and it is notorious that there is a wonderful difference be¬ tween huntsmen in this respect. Without entering again into the wide range of hunting, Hunting, we cannot do more than add a few maxims which may be v-*-- observed by a huntsmen in the field. In drawing for your fox, don’t be persuaded always to draw up wind. In the first place, you are in danger of chopping him ; secondly, he is sure then to go down wind at starting; and, thirdly, you may drive him into a worse country, or from his point. When found, get after him as quickly as possible if you have a body of hounds with you; if not, you will have a better chance of sport if you can wait till the body come up. This is easily done by a twang of the horn, or a false holloa, if hounds are under good command, and the convenient opportunity be seized upon. Keep near to them in chase, with your eye on the body of the pack, as well as on such hounds as may be leading; the body are more certain to be right. Next to knowing where a fox is gone, is knowing where he is not gone ; therefore, in your cast, always make good the head. This you will do for your satisfaction ; but hounds are seldom at fault for the scent a-head, when the chase has been at all warm, that is, on a fair scenting day ; for if the fox be gone forward, wherefore the fault ? Good hounds will seldom or never leave a scent a- head, unless the ground be stained by sheep or cattle, or when the chase leads over dry ploughed land, hard and dry roads, &c. It is high odds that your fox has turned to the right or to the left; but although his point may be back, he cannot well run his foil, from the number of horsemen that are generally in the rear of fox-hounds. Recollect your first check is generally the most fatal to sport, and for these reasons: Your hounds are fresh, and perchance a little eager; they may have overrun the scent for some distance, owing to their being pressed by the horses, which are also at this time fresh; nor will they always get their heads down as soon as they should do, from the same ex¬ citing causes. Again, your check now generally arises from a short turn, the fox having been previously driven from his point, which he now resolves to make ; and he will make it at all hazard at certain times. When your hounds first “ throw up” (<'. e. check), leave them alone if they can hunt; but, disregarding what the “ old ones” say on this subject, as inapplicable to these fast times, don’t be long before you take hold of them, and assist them, if they can¬ not. We would not go from scent to view; yet hounds in these days that will not bear lifting are not worth having. But do all this quietly as well as quickly. Turn your horse’s head towards the line you think your fox is gone; and the first moment you see all their heads up, that is, it they do not hit him off, put your horn to your mouth for one blast or two, and trot away to still more likely points. If your pack will divide when casting, so much the better ; but if they are good for anything, they will be making their own cast whilst you are making yours, by not keeping at your horse’s heels, but spreading as they go. When you have hit upon his point, if a single hound goes off with a good scent, get the body to him as quickly as you can ; but not so if the scent be not warm. In the latter case, your hounds will be in expectation of a fresh fox, and will be in a hurry ; the hound that is forward will be lifted, and in all probability you will have to seek for the scent again. Go gently, and your hounds, if steady, settle to it. Likewise, if, when at check, you are hol¬ loaed to a spot where a fox has been viewed, stand still, and say nothing at the moment the first two or three hounds throw their tongues. If you hurry the body on im¬ mediately, the scent will often be lost if the fox has been a few minutes gone. If it can be done, give your hounds the wind at a crisis like this. Again, when a fox has been viewed, and you go directly to holloa, do not take your hounds to the extreme distant point at which he was viewed, but a hundred yards behind it; and for this reason : If you take them to the extreme point, and they do not take up HUNTING. 47 Hunting, the scent at once, you have then to make your cast at a ven- v ^ ) ture ; whereas, if you lay them on at that distance behind it, you have somewhat of a guide to that extent, as to the line towards which you should draw them. The following further hints may be serviceable, or at all events they relate to hounds at check. In trying backy hounds have this advantage. It is evident the fox has come the line, up to the point where the check occurred ; and he must be gone either to the right or the left of it, or back. We make this observation, because so much has been said about the straight running of foxes, which is far from true ; and the necessity of persevering in the cast a-head with the fox, and back, on the foil, with the hare. The more hounds spread, within reason, in this backward cast, the better will be the chance of making the check a short one. Again, if at check on a road, or foot-path (the latter not often run over by foxes), when you observe some of your best hounds failing to make it good, on one side of either, it is reasonable to suppose the fox is gone on the other. It your hounds check in a cover in the middle of a run, and the fox is viewed away from it, try and get your hounds together as much as you can in the short time that can be allowed for it, before you cap them to the scent. It gene¬ rally ensures a good finish, from two obvious causes : First, hounds get fresh wind; and, secondly, they will have a better chance to carry a good head, which generally ends in blood, and in blood well earned; for the fox is more likely to stand longer, and go straighter, for not having been viewed by hounds when he broke. But the most difficult point for a huntsman to decide upon promptly is, when his pack divides, which division is on the hunted fox. If it happen in cover, his ear is his surest guide, as the cry is louder and stronger on a fresh found fox, than on one which has been for some time on foot. If when out of cover your pack should split on two separate scents, you should get as near as you can to what you imagine to be the chase, giving view holloas every yard you go ; also sending one of your whippers-in to stop the other hounds. Your choice will doubtless be directed by several circum¬ stances. You will first look for your truest and best line¬ hunting hounds, and next, to the points your first fox would be likely to make for; and if your choice fall upon the lot that are going furthest up the wind, the other will be more likely to hear them running; and, should they come to a check, to join cry again perhaps before a whipper-in can get to stop them. It was once justly observed, that those who seek pleasure from the chase must ask permission of heaven ; and the case still remains the same. Hounds without a scent resemble a man running in the dark; neither can make head against such fearful obstructions; and on stormy days, with a very high wind, if you have influence with your master, persuade him to let you go home after the first failure. It is not generally known what mischief even one such day does to some hounds. Don’t set too high a value on blood, unless well earned; it is the result of want of reflection alone that has set any value whatever upon it, when otherwise ob¬ tained. Mob a bad fox in a cover if you like; but never dig out a good one, unless your hounds have almost viewed him into a spout, and you can bolt him before the excite¬ ment subsides. Never break ground in a country belonging to another pack of hounds, nor dig for a fox in a moin earth in your own. Many a bitch fox, heavy with young, has been killed by this means in the spring, instead of the one that was hunted and marked to ground; and be assured that sportsmen in general do not estimate the goodness of a pack of hounds by the noses nailed against the kennel Hunting, door. Lastly, keep your field back from pressing on your's* hounds in chase, and still more so when in difficulties, as well as you can; but don’t suffer your zeal to carry you too far on this point. Remember the apostolic precept, “ Be COURTEOUS.” The modern annals of sporting contain the names and characters of several very eminent huntsmen, whose con¬ duct and abilities would have done credit to any other situ¬ ation of life to which it might have been their lot to have been called. Considering the responsibility of their office, the severity of their work, and the risks they run, they are not supposed to be too highly paid in wages, say on the average L.160 per annum, besides their board; hut, from perquisites, such as annual presents from gentlemen who attend the hounds which they hunt, and drafted hounds sold to other packs, they may realize the like sum in addition. The office of whipper-in is, in our opinion, thought more lightly of by the sporting world in general than it deserves to be; and, as we shall show, we have the great Beckford on our side. We never saw a steady pack of hounds without at least one good whipper-in, and we are quite sure we never shall; but we have seen many of these red-coated youths who might have been better employed at the plough-tail— who, like Cicero’s lawyer, belonged rather to the profession than the science. “ If he has genius,” says Beckford, “ he may show it in various ways; he may clap forward to any great earth that may by chance be open; he may sink the wind to halloo, or mob a fox when the scent fails ; he may keep him off his foil; he may stop the tail hounds, and get them forward; and has it frequently in his power to assist the hounds without doing them any hurt, provided he has sense to distinguish where he is wanted most. Besides, the most essential part of fox hunting, the making and keeping the pack steady, depends entirely upon him, as a huntsman should seldom rate, and never flog a hound. In short, I consider the first whipper-in as a second huntsman; and, to be perfect, he should be as capable of hunting the hounds as the huntsman himself. He should not be con¬ ceited, but contented to act an under part, except when circumstances may require that he should act otherwise; and the moment they cease, he must not fail to resume his former station.” To the above excellent remarks we have very little to add. We only recommend, when a huntsman is casting his hounds, that a whipper-in should turn them to him al¬ ways as gently as he can, and with little noise; by which means they will draw towards him, trying for the scent as they go; whereas loud and repeated rates and cracks of the whip make hounds fly to their huntsman at this time with their heads up. When they are drawing properly towards him, not a word should be said; a whipper-in riding outside of them will be sufficient. It is scarcely necessary to say, a whipper-in, to be per¬ fect, should be an accomplished horseman, as nothing re¬ quires a much firmer and nicer hand than the act of follow¬ ing a hound over open ground to flog him. A whipper-in, however, should always hit a hound first, and rate him after¬ wards, and be able to hit hard when occasion requires it. A riotous fox-hound cannot be trifled with, if he is to be cured of his evil ways ; and let the lash fall heavily when ne¬ cessary, but at no other time. Above all, let the whipper-in have an eye to a skirter: skirting is the least pardonable fault a hound can possess, because he is then deviating from his nature, and has not the force of impulse to plead, which the hound that runs riot has. (c. A.) (w. H. L—Y.) 48 Hunting¬ don Hunting¬ donshire. HUN HUNTINGDON, Selina, Countess of, was the daughter of Washington Shirley, Earl of Ferrers, and was born in 1707. At the age of twenty-one she was married to Theophilus Hastings, Earl of Huntingdon a man of dis¬ tinguished piety and religious zeal. With him she lived a happy and useful life till his death, which took place very suddenly in 1746. Of the numerous family which she bore her husband, four died in the bloom of youth. It was about this time that the religious revival set on foot by Wes ey, and taken up by Whitfield, had begun to influence English society. Until about the year 1748 the revivalists had acted in unity, but after that date the tenets of Whitfield becom¬ ing daily more Calvinistic, and those of Wesley more Ar- minian, they separated, and Whitfield became private chap¬ lain to the Countess of Huntingdon. By his advice she assumed a sort of leadership of the Calvinistic Methodists of England, or as they came to be called from her “ the Countess of Huntingdon’s connexion.” As her means were large and her personal expenses very small she was able to devote large sums of money to the maintenance and pro¬ pagation of her views. She built chapels, and engaged preachers to officiate in them, and established a college at Trevecca, in South Wales, for the education of Calvinistic preachers. After her death, which took place, June 17, 1791, the college was removed by her trustees from Tre¬ vecca to Cheshunt in Herts, where it now is. The num¬ ber of chapels mentioned in the census of 1851 as belong¬ ing to the Countess of Huntingdon’s connexion was 109, accommodating 38,727 hearers. Although the name of “ connexion” is still in use among this sect, there is no com¬ bined or federal form of church government. The congre¬ gational polity is practically adopted; and of late years several of the congregations have become, in name as well as virtually, congregational churches. HUNTINGDON, a municipal and parliamentary bo¬ rough and market-town of England, and capital of Hunting¬ donshire, stands on the left bank of the Ouse, on the line of the Great Northern Railway, 58 miles N. of London. It is connected with the old borough of Godmanchester, on the right bank of the river, by a causeway with three bridges, the largest of which has six arches. The town con- sists& of a long street with lanes branching off. Of 15 churches that were once in Huntingdon, there now remain only two, with three Dissenting chapels. There are two pub¬ lic schools, with a grammar and green-coat school. The com¬ merce is inconsiderable; the chief articles of trade being wool and grain, and of manufacture, bricks and tiles. It is governed by a mayor, four aldermen, and a common council. Two members are returned to parliament by the united boroughs of Huntingdon and Godmanchester. It was here that Oliver Cromwell was born, April 25, 1599, and his grandfather’s house, Hinchinbrook, is about a mile distant from the town. Pop. (1851) 3882. HUNTINGDONSHIRE, an inland county of Eng¬ land, bounded on the N. and E. by Cambridgeshire, on the N.W. by Northamptonshire, and on the S. by Bedfordshire, with two outlying parishes, viz., Swinestead in Bedfordshire, and Everton, between Bedfordshire and Cambridgeshire. The county is 29 miles long from N. to S., and 23 miles broad from E. to W. In size it is the third smallest of the English counties ; Rutland and Middlesex being the least. The county is divided into 4 hundreds, and 107 parishes, and forms an archdeaconry in the diocese of Ely. The surface of the county is generally flat. There are, however, two low ridges of hills, one entering the county from the S. near Potton Beds, and terminating in the Ouse Valley near Huntingdon; the other, coming E. from the borders of Cambridgeshire, crosses the county by Hun¬ tingdon to Wansford. Along the banks of the Ouse and the Nen, there are beautiful and fertile meadows ; in the S.E. is an extensive plain of rich meadow-land ; the centre HUN and upland part of the country is highly cultivated, though Hunting- much of it is still uninclosed. The latter was anciently a donshire. forest tract, appropriated to the chase. It was disforested, however, by Henry II. and Edward L, and is now very bare of trees, few being grown in the hedgerows, while woods and coppices are very rare. The north-eastern part of Hun¬ tingdonshire, comprising 50,000 acres, or one-fifth of its whole extent, belongs to the great “ Fen” district, extend¬ ing throughout the counties of Cambridge, Lincoln, North¬ ampton, Norfolk, and Suffolk. See Bedford Level. In Huntingdon, as well as in the other counties, these marshes are intersected by numerous artificial channels, by means of which they have been effectually drained and con¬ verted into a fertile region. Willows too have been planted of late years in this part of the county, and have been of considerable use in absorbing the superabundant moisture, and consolidating the soil. Situated in the Huntingdon Fen are three sheets of water, respectively named, Whittlesea, Karnsey, and Ugg-meres. The first is 1550 acres in extent, and the second is about half as large. Projects have been formed for draining both, as the water is shallow and the soil very rich. Whittlesea-mere was a favourite resort of sportsmen, both fish and wild fowl being abundant. The water of the low parts of the shire, although plentiful, is not generally good for drinking. The climate, it need scarcely be added, is not very good where there is so much fenny land and so little pure water. Consumption and other diseases of the respiratory organs are common causes of death amongst the inhabitants. The upper substratum of the county is formed of a bed of Oxford clay nearly 700 feet thick. The south-eastern dis¬ trict is occupied by ferruginous sand which rises into low hills, and is covered with the diluvial debris of the neighbouring chalk range. The high ground overhanging the valley of the Nen, on the borders of Northamptonshire, is composed of stone brash or forest marble. The rest of the county, with the exception of the Fens, is occupied by the Oxford clay. The soil lies in patches of gravel, sand, and clay ; the latter, which predominates, is intermixed with muddy allu¬ vial earth. Peat exists in many parts of the county, and is used for fuel. The rivers of the county are the Ouse and the Nen, with their tributaries. The Ouse enters the county from Bedford¬ shire, near St Neots, and flows by Huntingdon and St Ives into Cambridgeshire, on its way to the Wash. It is navi¬ gable for barges in its whole course through Huntingdon¬ shire, and thus forms an important means of communication for the agricultural produce of the county. The Nen divides the northern part of the county from Northampton¬ shire, and quits it at Peterborough; it is also navigable. The river has changed its bed, and the waters in the old channel run into Whittlesea and Ugg-meres. The other means of navigation in the county are a navigable cut from the old channel of the Nen at Standground sluice to the navigable channel of the Nen at Ramsey ; and Vermui- den’s, or the Forty-foot Drain, a cut from the old Nen near Ramsey to the Old Bedford River in Cambridgeshire. The Great Northern Railway traverses the county through¬ out its whole length, while it is connected with the Eastern Counties’ Railway by a branch line from St Ives to Hunt¬ ingdon. Agriculture is the only pursuit in the county; and the chief trade is that in corn, cattle, and wool. The main produce of the county is wheat, oats, and beans, with some barley, hemp, mustard seed, and hops; rape is also grown in the Fens, and turnips in the drier soils. The len lands have been much over-cropped, and, in consequence, the average produce of the county is low. A large number of horses are bred for sale in the Fens, though they are not generally good. HUN Hunting- The sheep of the county are a mixed race, composed denshire. 0f crosses of the Lincolnshire and Leicestershire breeds with the native kinds. They are without horns, and of very imperfect shape, but are found profitable from the quantity of wool they produce, their fleeces usually weighing from seven to eight pounds each. The sheep of the original race of the county are much inferior to those produced by the crossing with the better kinds; many of these are still found in the open commons, and their fleeces seldom ex¬ ceed four pounds in weight. The cattle, like the sheep, are a mixed breed, being in great measure the refuse of the Lancashire, Leicestershire, and Derbyshire races. The dairy cows are mostly Durham and Yorkshire short-horns; but dairy farming is not much followed ; and though Stilton, in tins county, has given a name to the celebrated cheese, that is now made exclusively in the counties of Lincoln and Leicester. Instead of using the milk for churning, a large number of calves are reared to supply the metropolis with veal. The farms are generally large, although, for the most part, they are inconveniently situated, sites having been chosen more with regard to dryness than the economy of labour. Of persons connected with agri¬ culture in the county there were in 1851—961 farmers, 15 corn merchants, 102 brewers, and 36 maltsters. The only other trade of the shire is brick and tile making, commenced a few years ago. Of persons engaged in the manufacture of clay there were 235 in 1851. Huntingdon was originally inhabited by the British tribe Iceni, and during the Roman occupation was included in the province of Flavia Caesariensis. The Saxons called the county Hunlandunscyre, and in their time it first formed part of East Anglia, and afterwards of Mercia. Hunting¬ donshire has given the title of earl since the days of William the Conqueror ; this title, originally conferred on Waltheof, brother-in-law of William, passed to David, king of Scot¬ land, and is now borne by a member of the Hastings family. There is also a popular tradition that the outlaw Robin Hood was Earl of Huntingdon. The antiquities of the county are neither numerous nor remarkable. It was traversed by two Roman roads, the Ermin Street and the Via Devana. Traces of ancient encampments remain at Dornford, Stangrund, and St Neots, and some Roman pottery at Holywell, near St Ives. Kimbolton Castle, the seat of the dukes of Manchester, was the residence of Catherine of Aragon after her divorce from Henry VIII. A great part of the county having be¬ longed to the monks, they erected abbeys at Ramsey and Sacotry, and priories at Huntingdon, St Ives, St Neots, and Hinchinbrook. A ruined gateway at Ramsey, a rich speci¬ men of decorated English architecture, and a dove-house and barn at St Ives, are the only remarkable remains of these edifices. Huntingdonshire returns four members to parliament, two for the county and two for the boroughs of Huntingdon. The polling places for the county are Stilton and Hunting¬ don, the number of electors being 3047. Owing to the small size of the county, it is associated with Cambridge¬ shire in the choice of high sheriff, and is required to supply that officer only once in three years. 1 he county courts are held at Huntingdon and St Neots. There were in Huntingdonshire in 1851, 91 Established ministers, and 37 Dissenting ministers. According to the religious census of the same year there were 196 churches in the county ; 96 of these belong to the Church of Eng¬ land ; 46 to the Methodists ; 30 to the Baptists; 7 to the Independents; and 17 to various minor denominations. . The educational census gives 95 public day schools, with 6631 scholars; and 135 private day schools, with 2552 scholars. The population of the county was in 1821, 48,946 ; 1831,53,192; 1841,58,549; 1851, 64,183. Oftownswith H U R 49 Hurdwar. more than 2000 inhabitants there were in 1851—Hunting- Huntly don, 3882 ; St Ives, 3522; St Neots, 2951 ; Ramsey, 2641; Godmanchester, 2337. The area of Huntingdon¬ shire is, in statute acres, 230,865. HUNTLY, a burgh of barony and market-town of Scot¬ land, Aberdeenshire, near the junction of the rivers Bogie and Deveron, and 39 miles N.W. of Aberdeen, with which it is connected by railway. It consists of two principal streets, crossing each other at right angles, with a market¬ place at the point of intersection. An ancient bridge of a single arch crosses the Deveron, and a modern one of three arches spans the Bogie. Besides the parish church, there is a Free Church, and chapels for United Presbyterians, Independents, Episcopalians, and Roman Catholics. In the neighbourhood are the ruins of Huntly Castle (destroyed in 1594), and Huntly Lodge, the seat of the Duke of Rich¬ mond. Pop. (1851) 3131. HURD, Richard, D.D., bishop of Worcester, and the friend and biographer of Warburton, was born inf1720, at Congreve, in the parish of Penkrich, Staffordshire. He was the second son of John and Hannah Hurd, whom he de¬ scribes as “ plain, honest, and good people, farmers, but of a turn of mind that might have honoured any rank and any condition.” Their farm was not far from the grammar^ school of Brerewood, at that time one of the best conducted schools in the midland counties of England. At this semi* nary their son was trained with such ability and skill, that at the age of fifteen he was ready for the university. En¬ tering Emmanuel College, Cambridge, he took the usual degrees in their ordinary course, and in 1742 was chosen a fellow of his college. He continued to reside at Cambridge till 1756, occupying his time in literary labour, of which the results were given to the public from time to time. In one of his works—a Commentary on the Ars Poetica of Horace —he had alluded in flattering terms to Warburton; and, though he is not believed to have had any selfish aim in view when he did so, he could not have devised a moie ef¬ fectual means for advancing his interests. In 1756 he was appointed rector of Thurcaston, where he resided for eight years, and where he wrote his Dialogues, his Letters on Chivalry and Romance, and some of those controversial pamphlets in which he was constantly vindicating the opi¬ nions and character of his idol Warburton. In 1 ^65 he was chosen preacher of Lincoln’s Inn ; and, two years later, was promoted to the archdeaconry of Gloucester, of which Warburton was bishop. In 1775 he was promoted, by Lord Mansfield, to the bishopric of Lichfield and Coventry ; whence, in 1781, he was transferred to that of Worcester. Two years later, on the death of Dr Cornwallis, he was offered the see of Canterbury, which, however, he declined, as “ a charge not suited to his temper and talents, and much too heavy for him to sustain in these times.” The remainder of his life he spent in studious retirement. He died in 1808, in the eighty-ninth year of his age. HURD WAR, or Haredwara, a town of Hindustan, in the Bri tish district of Saharumpore, under the lieutenant- governorship of the N.W. provinces ; a great mart of com¬ merce, and a celebrated place of Hindu pilgrimage, situated on the W. side of the Ganges, where it issues from the northern hills. The town is not large, having only one^ street about 15 feet in breadth, and one furlong and a half in length. Pilgrims of both sexes resort annually thither1 from all parts of India to perform their ablutions in the sacred Ganges. The month of April is the time appointed for this concourse of pilgrims; and great numbers of mer¬ chants also attending, one of the largest fairs known in.' Hindustan is held here. It is calculated that in general about 300,000 persons are collected on this occasion ; but, once in twelve years, when particular ceremonies are ob¬ served, the number is increased to a million. In April 1809, it was computed that two millions of strangers were VOL. XII. 50 H U R Huron assembled. The chief articles brought thither for sale are II horses, mules, camels, tobacco, antimony, assafoetida; dned Husband fruits from Cabul, Candahar, Moultan, and the Punjab; and Wife. shawjSj cloaks> &c > from Cashmere and Amritsir; spotted K turbans, looking-glasses, toys, with various manufactuies in brass and ivory, from Jeypoor; shields from Rohilcund, Lucknow, and Silhet; bows and arrows from Moultan and the Doab; rock-salt from Lahore ; baftas and piece- goods from Rahn, a large city in the Punjab ; many camels, and a species of flannel, from the Marwar country ; and from the Company’s provinces, Kharwa muslins, sarsnet, cocoa-nuts, and woollen cloths of a coarse quality. The merchants who frequent this fair travel in large caravans, and are frequently infested on the roads by freebooters, who watch their opportunity, and cut off” stragglers. During the Mahratta dominion, a poll tax and heavy duties were imposed on all the cattle. But these have all been repealed by the British, and every encouragement is now held out to merchants. In such a vast concourse of people from all quarters, disputes were formerly very frequent But owing to the strict police maintained by the British, these fairs have lately ended without bloodshed, to the surprise and satisfaction of the vast multitude, who were accustomed to see bloody quarrels at the Hurdwar fair. The stream divides itself into three channels at Hurdwar, the principal of which is on the western side, running along a bank named Chandnee Ghaut. The travelling distance from Calcutta by Moorshedabad is 1080 miles, by Birbhoom 975 miles, from Delhi 117 miles, and from Lucknow 311 miles. E. Long. 78. 14., N. Lat. 29. 57. (e. t.) HURON, Lake. See Canada. HURREEANAH, a British district in Hindustan, within the jurisdiction of the lieutenant-governor of the N.W. provinces; comprehending an area of 3300 square miles, with a comparatively scanty amount of population, consisting of Hindus and Mohammedans. The district is intersected by the canal originally constructed by Feroz Toghluk, the renowned king of Delhi. This watercourse having become nearly obliterated, was cleared out about thirty years ago, by order of the British government, and made available for the purposes of irrigation. Towards the close of the last century, George Thomas, an Irish adven¬ turer, made a bold attempt to establish an independent principality in Hurreeanah under his own rule. He fortifled the principal town, collected troops, cast cannon, and coined money bearing his own name; but being attacked by a superior native force under the command of the French adventurer Perron, he was overpowered and forced to retire. The principal towns are Hissar and Hansee. (e. t.) HURRUR, or Harrar, a large commercial town of Eastern Africa, said to be about 192 miles E. of Ankobar, and 150 S.S.W. of Zeyla. It is surrounded by a mud-and- stone wall, 12 feet high and 3 feet thick, and is about two hours quiet walking in circumference. The wall is in good repair, and has five gates. There are many large and well-built houses of mud and stone, but the majority of the people live in huts made of mats and reeds, with a thorn fence round them. The soil in the vicinity is very rich, producing coffee, wheat, barley, jowarie, &c., in great pro¬ fusion. Coffee is the most important export. The seaport is Zeyla. The inhabitants are rigid Mohammedans, and Christians are strictly prohibited from entering the town. (London Geographical Journal, vols. xviii., xix., &c.) HUSBAND AND WIFE. In civilized countries some solemnities are usually employed to mark the consti¬ tution of this relationship. The Council of Trent made it a religious ceremony. In Lord Stowell’s opinion it was not necessarily so in England prior to the Act of Geo. II.; and it certainly has not necessarily been so in Scotland since the Reformation. Into the past history of the subject we do not propose to enter. At present the marriage law of HUS England is regulated chiefly by two statutes—the 4th Geo. Husband IV. c. 76, and 6th and 7th Will. IV. c. 85. By the last andWife. of these it is enacted, that after the 1st March 1837, all the rules prescribed by the Rubrick should continue to be duly observed by every person in holy orders of the Church of England who should solemnize any marriage in England (the right of the Archbishop of Canterbury, or other person having authority to grant licences to marry at any conve¬ nient time and place, being reserved) ; while Quakers and Jews are allowed to contract marriage according to their respective usages, provided both the contracting parties be Quakers, or both profess the Jewish religion. One of the parties must give notice of their intention to the superin¬ tendent registrar of the district within which they have dwelt for seven preceding days, or if they have dwelt in the dis¬ tricts of different superintendent registrars, the like notice must be given to each. These officers are then required to preserve and enter a copy of the notices in the “ marriage notice book,” which is open to the public without charge; and after seven days, if the marriage is to be solemnized by licence, or after twenty-one days, if without licence, a cer¬ tificate is issued authorizing the marriage, one of the parties having first made oath or affirmation of belief that there is not any lawful hindrance, and that the statements contained in the notice are correct. Any person, duly authorized, may forbid the issue of the certificate by writing the word “forbidden” opposite the entry in the marriage notice book; in which event the su¬ perintendent registrar can issue no certificate until he be satisfied that the objection is unfounded. If he have doubt, the matter is referred to the registrar-general, who has power to decide; or if the superintendent refuses to grant licence, there is an appeal to the registrar-general, who either confirms the refusal, or directs the licence to be issued. Without attention to these particulars no marriage can be solemnized in England. If not celebrated within three months after the notice, the notice, entry, and certificate must be renewed. The certificate of the superintendent, or where the parties live in different districts, the certificate of the superintendent of each, is delivered to the officiating minister if the marriage is to be solemnized according to the rites of the Church of England; or to the registering officer of the Quakers, or officer of a synagogue, who may solemnize the marriage in the registered building mentioned in the notice. When parties choose, they may dispense wuth a clergyman, and be married according to any form they please, provided the marriage take place between 8 and 12 o’clock in the forenoon, in presence of a registrar and wit¬ nesses, and provided each of the parties in some part of the ceremony declare that they do not know any impediment to their union, and expressly call upon the persons present to witness the proceedings. The parties may also be mar¬ ried in this manner, after the proper notice and certificate, in the office and presence of the superintendent registrar; and they have always the option of the parish church of either of them. It is further enacted that “every person who shall knowingly and wilfully solemnize any marriage in England, except by special licence, in any other place than a church or chapel in which marriages may be solemnized according to the rites of the Church of England, or than the registered building or office specified in the notice and cer¬ tificate as aforesaid, shall be guilty of felony” (except in the case of a marriage between two Quakers, or two persons of the Jewish religion); “and every person who, in any such registered building or office, shall knowingly and wil¬ fully solemnize any marriage in the absence of a registrar of the district in which such registered building or office is situated, shall be guilty of felony; and every person who shall knowingly and wilfully solemnize any marriage in England (except by licence) within twenty-one days after the entry of the notice to the superintendent registrar, as HUSBAND AND WIFE. 51 Husband and Wife. aforesaid, or if the marriage is by licence within seven days after such entry, or after three calendar months after such entry, shall be guilty of felony.” And any marriage solemnized in disregard of the statute is null and void ; and in the case of a fraudulent marriage, the guilty party forfeits all the property that would otherwise have accrued to such party by the marriage. Alter the ceremony the marriage must be registered. In Scotland, since the Reformation, a regular marriage is constituted by a proclamation of banns in the churches of the parishes in which the parties reside, of which a register is kept, and by the acceptance by the parties of each other before a clergyman, who pronounces the nuptial benedic¬ tion in presence of witnesses. Till comparatively a late period, none but the Episcopal clergy, by 10th Anne, c. 7, could celebrate a marriage in Scotland, other than a minis¬ ter of the Established Church. By 4th and 5th Will. IV. c. 28, this privilege was extended to “any person in holy orders, of whatever communion he may be,” after procla¬ mation of banns. If any other party celebrate a marriage, or if a clergyman do so without proclamation of banns, unless he appear to have been deceived, he is liable by the act 1661, c. 34, to banishment from Scotland, and by 1698, c. 6, to fine and imprisonment. Parties may go before a justice of peace to effect a marriage, but he is only en¬ titled to certify that they declared themselves in his pre¬ sence to be married ; if he proceed further, and assume the ministerial office by pronouncing the nuptial benediction, he is liable in the penalties of the statute. By the statute 17th and 18th Viet., c. 80, it is provided that in all cases of regular marriage, the certificates of proclamation of banns, accom¬ panied by a copy of a schedule given in the statute, shall be delivered to the officiating minister, or person solemnizing a marriage according to the rites of Jews and Quakers, to be filled up with the particulars required for registration, and signed by the contracting parties, minister or other per¬ son officiating, and witnesses ; and within three days after¬ wards this schedule must be transmitted, under a penalty, for registration to the registrar of the parish within which the marriage was solemnized. If requested, the registrar is bound, on payment of a small fee, to attend at any place within his parish, for the purpose of making the entries, or seeing that they are properly made; and the marriage may be celebrated by the minister or pastor of a Christian con¬ gregation of any denomination. There is a provision in the statute for registering a marriage in the case of persons con¬ victed before any justice of peace or magistrate of having contracted an irregular one ; as well as a marriage de¬ clared by the sentence of any competent court, such regis¬ tration being made in the parish where the conviction oc¬ curs, or of the domicile of the parties; but by an omission the act makes no provision for the registration of those irregular marriages, numerous in Scotland, of which there is neither any conviction before a magistrate, nor any decree of declarator. As this statute expressly declares that the Scotch law of marriage shall not be affected by it, it is necessary to notice as briefly as possible what is essential to the constitution of marriage in Scotland. In doing so we may premise, that in order to be binding, and to secure all the rights of a legal marriage, it is not necessary that it should be what is called a regular one. By a long unbroken series of decisions con¬ firmed by the House of Peers, it is established that the simple acceptance of the parties as husband and wife, with¬ out the prescribed ecclesiastical solemnities, and without any ceremony whatever, constitutes a legal marriage. 1 hat acceptance may be proved in various ways ; 1. By express words ; 2. By a promise to marry, followed by sexual inter¬ course; or, 3. By conjugal cohabitation and acknowledgment. The acceptance must be given seriously and voluntarily by legally qualified persons. Pupils (that is, boys under 14, and girls under 12 years of age), idiots, and persons in a state of intoxication, are incapable of giving consent; per¬ sons within the forbidden degrees, impotent, or bound by a previous and existing marriage, are legally disqualified ; and the most express acceptance, though followed by consum¬ mation, if extorted by force or fear, is unavailing. Even when consent is apparently free from all objections, and expressed in the most regular manner, the law still views it in connection with every circumstance in the conduct of the parties which may explain or throw light on its true meaning. Accordingly, the acceptance contained in an antenuptial contract of marriage, wherever it is accom¬ panied by the usual clause binding the parties to solemnize the marriage jn a formal mannerj is construed as amount¬ ing only to a promise which cannot be enforced, though it may be the foundation of an action of damages. Some ob¬ jections, well founded at the time, may be removed by sub¬ sequent voluntary cohabitation. For example, parties going through a form of marriage in pupilarity, or under compul¬ sion, will be bound by it if they voluntarily continue the cohabitation after passing pupilarity, or regaining unrestrain¬ ed freedom. The subsequent discovery of previous profli¬ gacy, or error as to rank, name, temper, legitimacy, religion, or deception as to fortune, or non-consent of parents or guardians, will not invalidate a Scotch marriage. Indeed, nothing short of an absolute mistake as to identity will have that effect; and even then, cohabitation after the mis¬ take is discovered will render the marriage irrevocable. In regard to the evidence that a de preesenti consent was interchanged, we may observe— 1. That it may be proved directly—(1.) by witnesses swearing to the formal and serious verbal acceptance before a clergyman or friends ; or by deliberate and explicit verbal acknowledgment of the parties that they were at some former period married to each other. (2.) It may be proved by writing, followed by delivery, provided the writing be either holograph of the parties, or be executed before witnesses, like other important documents; or at least that it be proved that the writing or subscription is genuine. And, (3.) It may be proved judicially, by the one party referring to the oath of the other, who either fails to deny it, or declines to swear. And it is of no consequence that the consent was secretly exchanged, if there be no¬ thing else to discredit it. In some Scotch burghs the dis¬ creditable practice exists of presenting a complaint to the magistrates, praying that the parties be fined for having contracted an irregular marriage. The parties (who are the collusive promoters of the complaint) then confess the charge, and are fined in a nominal sum ; and this procedure forms legal evidence that they were married. The equally discreditable Gretna Green marriage rests on the same ac¬ knowledgment. As showing how completely the mere interchange of present consent, without any particular ceremony, consti¬ tutes in Scotland a valid marriage, we may mention that in a Scotch case, holograph and signed documents, “I here¬ by declare that Johanna Gordon is my lawful wife,” and “ I hereby acknowledge John Dalrymple as my lawful hus¬ band,” were sustained in the House of Peers; Lord Stowell declaring that such a contract, without consummation, “ does ipso facto et ipso jure constitute the relation of man and wife.” As the most explicit declaration of marriage must be mutual, a document found in the repositories of either to which the other was no party is obviously worthless, un¬ less connected with other circumstances. Thus a letter, containing on its envelope, “ not to be opened till after the decease of George Fullarton,” found in his repositories after his death, was disregarded, in respect that it was revocable while undelivered. A similar letter delivered to a third party, and connected with other circumstances implying the woman’s recognition of it in her husband’s lifetime, was Husband and Wife. 52 HUSBAND Husband sustained, the delivery being held to have been for her be- and Wife. boof. A course of letters between the parties, which com- menced “ dear wife,” and “ dear husband, and ended your affectionate husband,” or “ wife,” although they contained no explicit declaration of marriage, were found by the House of Peers to be equally conclusive. In the case of 31 Adam, affirmed in the House of Peers in 1809, it was found suffi¬ cient, that the man called four servants and declared to them verbally that the woman was his wife, and that his children by her were legitimate; on which she gave him her hand, and curtsied; though in a few hours afterwards he committed suicide. As there was no evidence of insanity, Lord Eldon remarked that no subsequent repentance, how¬ ever bitter, could affect a marriage once constituted. A different judgment is given wherever circumstances warrant the opinion expressed by the House of Peers in the case of Taylor, 1787, that what the parties did “ was not intended, or understood to be final,” as was most remarkably illustrated in the case of McGregor and Jolly, where the House of Peers disregarded a formal ceremony of marriage before a clergyman, on the ground that, looking to all the circum¬ stances in “ the conduct of the parties, both before and after the 23d May 1816” (the date of the ceremony), they did not “voluntarily and deliberately express that real and mu¬ tual consent,” which is required. Some of these circum¬ stances were, that M‘Gregor never claimed the woman as his wife till many years afterwards, when she succeeded to a fortune, he having in the interval approved of her marriage with another, by whom she had children, and visited and acknowledged them as husband and wife. 2. The requisite consent may be proved inferentially— by a promise to marry, followed by sexual intercourse. Intercourse may be proved by witnesses, but the promise can only be proved by “ writ or oath.” It was at one time held that circumstances inferring that a promise had been given—such as an open courtship—might be proved by wit¬ nesses; but that doctrine is now exploded, and nothing short of a distinct promise can be founded on. Most conditions added to a promise—such as, “ I will marry you when my circumstances permit ’’—are held to be discharged by the subsequent intercourse. The general rule is, that conditions of such a nature as cannot be fulfilled until after the copula,— as, for example, “ I promise to marry you, provided an heir be born of our connexion,”—will not constitute marriage; while, if they might be fulfilled before the copula,—as “ I promise to marry you when I am rich enough,”—the law will presume that they were either fulfilled or discharged at the date of the copula. Either party may pursue an action to have such a marriage declared. It is no objection to it that the intercourse existed prior as well as subsequent to the promise; because a party may have resolved to discontinue an unlawful course of life, and so have obtained the pro¬ mise. Undoubtedly, if the interval between it and the subsequent intercourse be very long, or if circumstances indicate that the promise was renounced (such as the un¬ chaste conduct with others of the party founding on it), it will be disregarded; and, generally speaking, whatever is sufficient to warrant a dissolution of a regular marriage, will elide a presumptive one. It has been found by the House of Peers that a woman’s ignorance of the fact that the in¬ tercourse following on a promise constituted marriage, did not destroy her legal rights. Such a marriage is unques¬ tionably valid, if circumstances do not create a sufficient presumption against it. Lord Karnes, in his Elucidations, inquires whether it should be sustained in competition with a subsequent regular marriage ? In an old case, the late Commissary Court of Scotland decided that question in the negative, but it was not carried to the higher court, and it is regarded as an erroneous judgment. No doubt parties contracting a regular marriage are exposed to most fearful and obvious hazards from collusion and perjury; AND WIFE. and it may well be asked, if that judgment be erroneous, Husband whether there is any use in going through a regular mar- and Wife riage after proclamation of banns. But while the prin- ciple of the law that the prior marriage, however informally contracted, is preferred to the most regular subsequent one, it will in most cases be held that any presumption in its favour is destroyed by the still stronger presumption arising from the conduct of parties and its undue concealment. But wherever there is no doubt of the promise, and of the intercourse following on it, if there be nothing to warrant the presumption that the promise was disregarded, a mar¬ riage so constituted is sustained. 3. The requisite consent may be proved inferentially—by conjugal cohabitation, and being reputed married persons by friends and neighbours. This is supposed to have been first introduced by the Scotch statute 1503, which declared that where a woman was reputed to be the wife till the man’s death, she should be entitled to her rights as his widow till it be proved that she was not his wife. Where the cohabitation was of considerable duration, and the parties openly mingled in society as acknowledged married parties (for both cohabitation and repute must co-exist), the pre¬ sumption that the requisite consent, which the law allows to be given secretly, was really interchanged, is not an unrea¬ sonable one. But wherever it appears that such cohabitation was assumed merely from respect to public decency, the effect of it is destroyed. In judging of its true character, therefore, it is of importance not merely to ascertain w hether it occurred within the natural sphere of the parties, but also how it commenced. Lord Eldon said, that “ wherever it clearly appeared that it was at first illicit, it was likely to continue illicit;” and Lord Redesdale concurring, said, “ that to raise the presumption of marriage, the repute must be general, and not such as might be created by statements or conduct designed to induce lodging-keepers to admit the parties into houses of respectability.” The complaint of a woman claiming the rank of a wife, that the man had taken advantage of her by not introducing her to his friends, led another judge to remark, that “ that complaint destroyed the very foundation of a plea of repute; and that wherever the connection was originally illicit, the law required some de¬ cided and unequivocal act to mark the change.” This desi¬ deratum was supplied in Madam’s case by what passed before his servants; and it was also supplied in another case, after some length of illicit cohabitation, by a meeting ot friends being purposely called, at which the parties were drank to and bedded as married persons. We may here observe, as applicable to all sorts of mar¬ riage recognised by the law of Scotland, that the circum¬ stances inferring its constitution must occur either in Scot¬ land or in a country where the same inference would be drawn from the like circumstances. This rests on the prin¬ ciple that the conduct of parties must be tried according to the law of the country where it occurred. In the case of the Countess of Strathmore in 1750, a proof ot matrimonial cohabitation and repute in a foreign country was allowed, because a marriage was understood to be so constituted in that country ; while, in another case, in 1811, an offer to prove that a promise and subsequent copula occurred in England, was disregarded, because no such mode ot consti¬ tuting marriage was then recognised in England. It makes no differencein such cases that the parties are Scotch by birth. These rules of judgment are followed in England even in the case of English parties. Lord Stowel said, “ the validity of Miss Gordon’s marriage rights must be tried by reference to the laws of the country where, if they exist at all, they had their origin.” The same principle received effect in England in 1748, where, in reference to a marriage of English parties contracted in France, Lord Hardwick said, “ that a marriage established by the sentence of a fo¬ reign court, having proper jurisdiction, is conclusive by the HUSBAND AND WIFE. 53 Husband and Wife. law of nations ” In 1819, such a judgment was repeated in England with reference to a marriage of English parties On the marriage being constituted the parties are bound to adhere with fidelity to each other; and the husband must support his wife according to his circumstances, un¬ less she have property of her own sufficient for her support, with which her husband cannot interfere. The moveable property of both, including the fruits of the wife’s heritable subjects, the interests of her bonds, and even the profits of her personal labour and skill, become the property of the husband. The marriage operates like a deed of assignation, so that the husband can sue for the recovery of these rights of his wife in his own name and without her concurrence; and any attempt on her part to defeat him, occurring after the proclamation of banns, is held to be fraudulent. Ihe common moveable property of the parties is sometimes called the goods in communion; and yet the wife during the marriage has truly only the hope of getting a share of it— her rio-ht in it not being indefeasible till the death of her husband. The husband’s right is called his>s mariti. In virtue of this right he may sell, gift, or waste the common property at his pleasure, and his creditors may attach it for his debts. The wife’s paraphernalia, comprehending her personal attire and ornaments, and such ai tides of a kind used by either party as the husband may have gifted to her before the marriage, are excepted. Besides having this right to her moveables, the husband on the marriage be¬ comes her legal guardian. He may, however, i enounce both his jus mariti and his right of administration ; and where he does so, the wife can act in reference to hei own estate independently of her husband, and altogether as fully and freely as if she were unmarried—leasing, feuing, selling, or burdening her property, or appointing factors to manage it, though in opposition to her husband’s will. But the hus¬ band may renounce hisjus mariti and yet retain his cuia- torial powers, in which last case she can only act with his concurrence. Third parties may convey property to a wife conditionally, and so as to exclude all the rights both of the husband and his creditors ; as, by declaring the conveyance to be purely alimentary, and exclusive of these rights; or by conveying to trustees for her behoof, with a similar exclusion of the husband and his creditors. A wife, by her own antenuptial contract, may reserve all the rights which she possessed as a single woman. After, however, a. maniage is entered into, a husband cannot renounce his jus mariti to the prejudice of his creditors : and even when the renun¬ ciation is not to their prejudice, it seems to be in the nature of donations between husband and wife, which are revoc¬ able at pleasure during the existence of the marriage. In law the husband is liable, so long as she remains alive, for all the personal debts contracted by his wife prior to the marriage; but this liability terminates on her death, unless his estate were attached by “complete legal diligence,” during the marriage ; or unless he was a gainer by the marriage to the extent of something beyond a reasonable tocher. Even when made liable, on the ground of having received some excessive advantage, it is only in the event of the wife’s separate estate being found insufficient, that he becomes personally liable. If he be imprisoned for a prior debt of his wife, for which his own separate estate has not been attached, and if she die, he is no longer liable in pay- ment. During the marriage the husband and not the wife is liable for all domestic furnishings which she may order ; and such furnishings may be proved against him by her attestation or evidence. In other respects she is not re¬ ceived in evidence against her husband, except in the case of assault committed by him against herself. For furnish¬ ings unsuitable to his condition in life made on the order of a wife, the husband is not liable; neither is he liable for any fine in which she may be subjected by a court of law as the punishment of her crimes. In this last case, however, so HusW entirely is a wife’s person exempted from imprisonment during marriage (except in a few instances now to be v noticed), that where a fine is awarded against her on account of her crimes, it cannot be enforced by her imprisonment until the death of her husband. Indeed, even for her ap¬ parent crimes she maybe relieved of all consequences, if it clearly appear that she acted under the compulsion o icr husband. When, however, she voluntarily acts on her own account, or in concert with him, in the commission of crime, she is liable in criminal punishment. In England, as Justice Coleridge remarked, a husband may compel his wife to cohabit with him ; adding, however, that the moment compulsion becomes unnecessary ^ “ for keeping her in the path of duty, it becomes illegal.” In Scotland the same end is generally effected by the hus¬ band being entitled to w-ithhold all alimentary support if she withdraw from his society, unless on sufficient cause. It has been found that a husband may, without any reason, debar his wife from his house, and assign her a separate, if it be not an unsuitable, residence. She takes his rank and precedence, unless these are merely official. She cannot sue at law, either in England or Scotland, without his con¬ currence, unless he have renounced all his rights, including that of guardianship; neither can she be sued in civil ac¬ tions, unless her husband be called as a defender. All voluntary deeds of separation are revocable at pleasure, unless it appear that the revocation is merely for the purpose of obtaining an increase of aliment. Ihe bills, bonds, and cautionary obligations of a married woman are null, so that she cannot be sued on them even after her husband s death ; yet, like a minor, she may insist on other parties, who may have contracted with her in the knowledge that she was a married woman, fulfilling their contracts with her, where- ever it is her interest to do so, provided she is ready to perform the counter part incumbent on her. Contracts, however, gone into by a married woman, are binding against her separate estate wherever they are clearly beneficial, such as for improvements on her separate property, just as the expense of managing or recovering her separate estate forms a good charge against it. Necessary furnishings for clothing, or aliment for herself, as well as for the domestic consumption, do not form the ground of a charge against her, but only against her husband. If a married woman fraudulently holds herself out as a single woman, and de¬ ceives parties into contracts with her, her separate estate will be liable in all consequences. Where a husband be¬ comes insane, the disabilities under which a wife lies, equally with his curatorial powers or guardianship, are at an end, and she is entitled to manage, and probably to alienate, her estate, and do every act of a rational character; though even then it is not understood that she can be imprisoned for civil debts. If the married pair be judicially separated, a wife’s creditors may attach her allowance for necessary fur¬ nishings made to her. Where the husband is abroad, a wife’s "obligations for necessaries are effectual; and if, in order to procure a livelihood while her husband is abroad, she engage in trade, she then becomes, even during his life, liable to imprisonment for her debts. There is nothing to prevent a married woman making a settlement of her separate estate, without the consent of her husband, to take effect after her death; and there is no reason why, if she please, the party to be benefited by such a deed should not be her husband. She is also liable to be imprisoned in order to compel her to subscribe necessary deeds which the Court has found her to be under a legal obligation to grant. Where she pursues an action at law, she must have her husband's concurrence, unless he have renounced his jus mariti and right of guardianship; and if he improperly withhold his concurrence, the Court will appoint a curator to her for the occasion. When an action is raised against 54 H U S B A N D A N D W I F E. Husband ])er, the husband must be called for his interest; and if he and \\ ife. refuse (0 appear, which he may when the action may have a prejudicial effect on himself, the Court, on being satis¬ fied of the propriety of doing so, will appoint a curator for her, to aid her in the defence. The law of England and of Scotland are alike to the dis¬ advantage of the wife, in this respect, that marriage operates like a formal deed of assignation to the husband of all the wife’s moveable estate, unless she is protected by an ante¬ nuptial contract, or by special clauses in conveyances by third parties for her behoof. She cannot otherwise acquire and hold money, or other moveable property. The husband is no doubt bound, as the holder of the goods in commu¬ nion, to give to her a reasonable sum for her support; but then he may give that sum actually out of the proceeds of her own labour, as an author or an actress, a trader, or a needlewoman, and spend or misspend the surplus accord¬ ing to his own pleasure. The laws of both countries cer¬ tainly relieve the wife from all responsibility, even for the necessary furnishings required for her own consump¬ tion ; and where her personal gains are less than what is re¬ quired by both her and her husband, she may have nothing to complain of. But when a husband altogether fails to support his wife, and squanders his time and means in utter profligacy, leaving to her only the alternative of la¬ bour or starvation, it is well worth the consideration of par¬ liament whether the law should permit him to keep his wife constantly in poverty, by periodically pouncing on the fruits of her industry, and dishonestly wasting it, without even paying to her out of it what is required for her sup¬ port. If this cannot be restrained, as we think on a hus¬ band’s failure to do his duty it easily might, it may well be questioned whether a wife does not purchase exemption from personal responsibility at too great a price. Marriage is dissolved by divorce or death. In Scotland there are two grounds of divorce—malicious desertion, and adultery. Neither of these necessarily dissolve the mar¬ riage, but only afford a plea, which may either be aban¬ doned or rendered available by an action at law. If either party die during the dependence of the action, and before final judgment of divorce is pronounced, the rights of the survivor and of the heirs of the deceased must be tried on the footing of the marriage having been dissolved only by death. ]. Desertion.—By the Scotch statute 1573, c. 55, it is enacted, that where any of the “ spouses shall divert frae the other without sufficient grounds, and shall remain in his or her malicious obstinacy for four years,” the injured party may take certain steps to bring about a dissolution of the marriage. The first is the action of adherence, which may be raised after one year’s desertion. If the desertion have not lasted for a year, or if it occurred in the course of ne¬ cessary and lawful business, this action is useless as a step in the divorce. If the defender have broken up his Scotch domicile, and withdrawn himself from the jurisdiction of the courts of Scotland, leaving his wife behind, it seems hard to deprive her of her legal remedy by his own unlaw¬ ful act; and therefore such an action in Scotland, provided the husband received notice of it, has been often sustained, though the legality of doing so is now seriously questioned. Where the wife is the deserter, and the husband remains in Scotland, there is no difficulty, as her domicile is in law- held to be that of her husband. The action of adherence will be sustained in the face of an agreement to separate, because such an agreement is contrary to the first duty of marriage. Maltreatment or adultery furnishes a good defence against this action. On the decree of adherence being pro¬ nounced, the next step is to raise letters of horning and charge the defender to adhere. If recusant, the defender is denounced rebel, and application is made to the presby¬ tery to admonish, and, if necessary, to excommunicate.. In practice, presbyteries decline to interfere, whereupon the Husband pursuer protests for remedy at law, and, on the expiry of and Wife, four years from the desertion, raises the action of divorce, It is then too late for the defender to offer to adhere. On its appearing that the steps now alluded to were regularly gone through, decree of divorce is pronounced. The act 1573, c. 55, provides that the defender shall “ tyne and lose” the tocher and the donationes propter nuptias, by which is understood all provisions, either by law or paction. If the husband be the offending party, he must restore the tocher, and pay to the wife all the provisions in her favour, legal or conventional; and if the wife be the offending party, she forfeits the tocher and all the right that would have belonged to her if she had survived, such as terce,jus relictce, See. If the offending wife be an heiress, the hus¬ band has right to the courtesy of her estate, if there were an heir of their marriage. An estatedevolving to either party subsequent to a divorce, is free from all claim at the instance of the other party, as the divorce terminates all relationship between them. It is an error to suppose that any deser¬ tion, however protracted, by either of the married pair, un¬ less followed by a decree of divorce, will warrant the other in entering into a second marriage in the lifetime of the party who deserted, or furnish a defence against a criminal prosecution. 2. Adultery.—By the canon law adultery entitled the innocent party only to separation from bed and board. By the Scotch law, it does not dissolve marriage unless the aggrieved party shall bring the proper action requiring the dissolution ; and the offender may be pardoned at the plea¬ sure of the injured party. Pardon, which may be inferred from the conduct of the parties, or being accessory to the defender’s guilt, is a bar to divorce. When divorce is pro¬ nounced, both parties are free to marry, as if they had never been married to each other, with this exception, that by the statute 1600, c. 20, the guilty party is prohibited from marrying the person with whom the adultery was committed. The prohibition, however, fails if the person with whom the adultery was committed be not judicially ascertained and named in the decree of divorce, or if the divorce were pro¬ nounced by a foreign judicature, as the statute refers only to divorces pronounced by the “ ordinar judge,” meaning a judge in Scotland. On raising the action, the pursuer must swear that it is believed to be well founded, and that it was not raised, either directly or indirectly, in collusion with the defender. Both the date of the marriage and of the guilt of the defender must then be proved, so that it may be ascer¬ tained that the latter did not occur prior to the former. Sometimes it is pleaded in defence that the domicile of the defender is beyond the jurisdiction of the Scotch courts. Some years ago this defence was disregarded wherever the marriage was Scotch, and the defender was cited edictally. It is now otherwise. Where the wife is the defender, and her husband is domiciled in Scotland, she is held, on being cited edictally, and getting notarial intimation of the action, to be amenable to the Scotch court wherever she is resi¬ dent, on the ground that her husband’s domicile is hers. As against the husband, however, there must either be, at the date of the action, his actual domicile in Scotland, or the presumption of such a domicile, founded on residence of forty days within Scotland. When such domicile on the part of the husband exists, an action will be sustained against either party, even though English by birth, and though the marriage was contracted in England ; and it will be sus¬ tained against the wife even although she be still resident there. This has led to a painful collision with the law of England. In the case of Lolly, the husband had contracted an English marriage, and he was divorced by the Scotch court on the ground of adultery committed while on a visit to Scotland of a duration sufficient to found jurisdiction. He then returned to England, and having there married HUSBAND AND WIFE. 55 Husband another woman, he was tried at the Lancaster assies for and Wife, bigamy, and received sentence of transportation—not be- v'-^' cause of insufficiency of the residence in Scotland to sub- iect him to the law of Scotland, but because an English marriage being indissoluble in England, except by act of parliament, it was held that it could not be disturbed by the law of another country, to which the parties could not be supposed to have had reference at the time of their mar¬ riage. The sentence of transportation against Lolly has had no effect whatever in altering the Scotch practice in this particular ; and there can be no doubt that if Lolly had remained and married in Scotland, even the House of Peers would have sustained the validity of his second marriage, to the effect of finding its issue entitled to succeed to his pro¬ perty in Scotland. Another question yet remains. While domicile creates jurisdiction, must the Scotch court decide all questions arisingfrom marriage, according to the law of the place where the marriage was contracted, and thus refuse divorce to parties domiciled in Scotland who were married where such a mode of dissolution is not permitted ? This question is in Scotland uniformly answered in the negative, otherwise the supremacy of the law of Scotland within its own territory would be compromised. 1 he legality of the marriage itself, however, like all other contracts, is deter¬ mined according to the law of the place where it is said to have been contracted. Analogous to this is the rule existing both in England and Scotland by which the goods in com¬ munion are divided according to the law of the domicile, without regard to the place of the marriage. In the com¬ paratively recent case of Duntz, 1816, the parties weie English by birth, and married in England in 1810. In 1813 the°husband came with his wife to Scotland, where his domi¬ cile was established, after which he raised an action of divorce. In the course of the process the opinions of the Judges of the Court of Session were taken on this question, “ Is it a valid defence against an action of divorce in Scotland on account of adultery committed there, that the marriage had been celebrated in England ?” and they unanimously concurred in saying that it is not. In a similar case, Edmonston, 1816, with this variation, that the parties were Scotch, the defence was urged that the action should be restricted to separation from bed and board, but it met the same fate. On this subject Lord Robertson expressed with great clear¬ ness views which were recognised as correct by Mr Justice Storey, when he said, “ marriage is merely a personal con¬ sensual contractand it may be “ thought that the lex loci must be resorted to in expounding every question that arises relative to itbut it “ is a contract sui generis? and ‘ it differs from other contracts in this, that the rights, obliga¬ tions, or duties, arising from it, are not entirely left to be regulated by the agreement of parties, but are to a certain extent matters of municipal regulation, over which the par- ties have no control. It confers the status of legitimacy, &c. Unlike other contracts it cannot, in general amongst civi¬ lized nations, be dissolved by mutual consent, and subsists in full force even though one of the parties should be lor ever rendered incapable, as in the case of incurable insanity or the like, from performing his partol the mutual contract. It is no defence after domicile is established that the adul- •tery is committed only out of Scotland ; but it is a. goo defence to either party in an English marriage that it was committed abroad, before the Scotch domicile was acquired. The followino- seem to be the results of the above and some other decisions:—!. Adultery abroad, where the law does not on that account dissolve marriage, and prior to the Scotch domicile, will not warrant a divorce in Scotland. 2. But the instant that a forty days’ domicile is acquired by the husband in Scotland, divorce will be pronounced by the Scotch court against either husband or wife on account ot adultery committed anywhere after or in the course ot ac¬ quiring such domicile, no matter where the marriage was contracted, or where the parties have been born. 3 If Husband before the action of divorce is raised, tile husband have left , , Scotland and established a foreign domicile, the comts o Scotland cease to have jurisdiction. 4. I he circumstance of both or either of the parties being Scotch by birth, or having estates in Scotland, will not, independent o tie husband’s domicile, confer jurisdiction on the Scotch court. These results rest on the principle that when parties hie^k up their old domicile, and enter and acquire a domicile in a new territory, they voluntarily subject their future con¬ duct to its laws. _ . In regard to the defences against an action ot divorce 1. Collusion, if proved, between the parties, affords to the repentant defender a good defence against divorce; but though it should appear that the defender intentionally gave ground for the suit so openly that detection was in¬ evitable, and expressly to provoke the other party to bring the suit, divorce will be granted, if the pursuer was not ac¬ cessory to the misconduct. 2. Forgiveness, or the plea of remissio injuria, as it is called, when established, is fatal to the divorce. As adul¬ tery operates only as a plea for divorce on the necessary action being raised, it follows that the injuied party ma^ fin-give, or abstain from suing for redress. The forgiveness may be proved directly, by words or writing, or inferential!y, from cohabitation after the guilt is known. As, generally speaking, a wife cannot so easily withdraw from the hus¬ band as the husband from the wife, Lord Stowell remarked, “ that though the husband is bound to take prompt notice of the infidelity of the wife, yet this doctrine is not to be pressed against a wife, except in particular circumstances. It is a plea in bar of process, but to be successful it must apply to the specific guilt charged, and not to other offences which may not have been either known or pardoned. Facts inferring forgiveness can only be regarded when it appears that the guilt was certainly knowm. The raising of the suit infers certain knowledge ; but not the conducting of a preliminary precognition. It may be proved by a refer¬ ence to oath. A written discharge of all and any offences committed prior to a certain date is available. 3. Lenocinium, or a party’s either directly or indirectly encouraging, countenancing, or instigating the othei s guilt, or purposely throwing temptation in the way, affords an available defence ; as no one is entitled to take advantage of his own improper conduct. 4. Recrimination, or the plea that the pursuer has been guilty as well as the defender, seems at one time in Scot¬ land to have been an available defence; but it is not so now. If the defender bring a counter action, and both parties are successful in proving each others guilt, mutual divorces will be pronounced, producing patrimonial con¬ sequences. , .. 5. Further, it is a good defence against decree of divorce being finally pronounced that either party have died in the course of the process, no matter how plainly the guilt may have been proved in the lifetime; and the guilty party, or the heirs of the guilty party, cannot then be deprived of those patrimonial rights which may open on the dissolution by death. It is competent to creditors interested to prevent a de¬ cree of divorce going out against their debtor, to sist them¬ selves as defenders, and propone all defences competent to their debtor ; as, for example, that the guilt was pardoned ; or that the action is carried on collusively, to injure the defender’s civil rights, and defeat the chance of the credi¬ tors recovering their claims. It has been decided by the House of Peers that it is too late for the trustee for the husband’s creditor to appear and offer to prove collusion after the pursuer had both deponed that there was none, and had also proved her husband’s guilt. In regard to the proof, the only general rule that can be 56 HUSBAND Husband ]ai(J down is, that the circumstances in evidence must be and \\ ife. as lead the discretion of reasonable men to the con- elusion of guilt. The paramour is not bound to criminate himself; but his declining to answer is not to be overlooked in considering the other evidence, though by itself it is of no consequence. 1. As to the consequences of the dissolution of mar¬ riage by death. We shall advert to these as they stand, irre¬ spective of the recent statute 18th Viet., c. 23 ; and then mention the changes introduced by that statute. Where marriage subsists for a year and day, or where a living child has been born, the surviving wife succeeds to her terce, being the liferent of the third of her husband’s heri¬ tage (excluding burgage property) in which he died in- feft, and to the half or third of the goods in communion, called jus reliette, according as- a child has or has not sur¬ vived ; or otherwise, where she has conventional claims, sometimes granted in lieu of her legal rights, these conven¬ tional rights are secured to her. In regard to the hus¬ band, if he survive, and the marriage have subsisted for a year and day, he becomes the irrevocable proprietor of the tocher, and of the half of the goods in communion, or two-thirds if children be alive, subject to their claim of legitim. His conventional rights are secured to him. If a child of the marriage was heard to cry, the husband suc¬ ceeds to his courtesy, being the liferent of the deceased wife’s heritage, which fell to her by succession, and in which she died infeft. If the wife had a living child by a former marriage, who succeeds to her heritage, the last and surviving husband has no right to the courtesy. If the marriage be dissolved within a year and day, without there having been a living child, the parties are reinstated in the condition in which they were before the marriage, in so far as practicable, and the tocher must be returned, in so far as unconsumed. The surviving party, whether husband or wife, loses all right in the other’s estate. Even contracts between the parties are annulled, unless they contain a provision to the contrary. If there be no children born of an irregular marriage, the year and day are counted from the date of the acknowledgment. Where children were previously born it draws back to the birth. It must now be kept in view, that by the recent statute, 18th Viet., c. 23, §6, it is enacted, “ that where a wife shall predecease her husband, the next of kin, executors, or other representative of such wife, whether testate or intes¬ tate, shall have no right to any share of the goods in com¬ munion ; nor shall any legacy or bequest, or testamentary disposition thereof, by such wife, affect or attach to the said goods or any portion thereof.” And farther, by § 7, that “ where a marriage shall be dissolved before the lapse of a year and day from its date, by the death of one of the spouses, the whole right of the survivor, and of the repre¬ sentatives of the predecessor, shall be the same as if the marriage had subsisted for the ■period aforesaidand by the 3d and 4th sections of that statute, it is provided that where any person dying intestate shall predecease his father, without leaving lawful issue, his father shall have right to one-half of his moveable estate ; and where such person dying intestate, whose father has predeceased him, shall be survived by his mother, she shall have right to one-third of his moveable estate. These, it is believed, are the only alterations of the prior law of Scotland introduced by that statute, affecting the dissolution of marriage by death. 2. As to the consequences of the dissolution of marriage by divorce on the ground of adultery. If the wife be the di¬ vorced party, she is considered, in reference to all patrimonial rights, to be dead, and therefore can claim no provision of any sort, either legal or conventional; and the husband has right to the courtesy. If she made a donation to her husband during the subsistence of the marriage, she can now no longer revoke it; and no right can pass to those AND WIFE. who would have been her executors for a share of the goods Husband in communion. If the husband be the divorced party, the an pleasure. Where there are children, if the mother be the successful pursuer, she is allowed to have the custody of female children till twelve, and males till seven years of age, with a suitable allowance for them. The court has a discretionary power to dispose of the children, according to circumstances, but it is not exercised except in extreme cases. After the parties are judicially separated, the hus¬ band is no longer liable for the debts which the wife may contract, provided he pay to her the sum awarded by the court for her support. From what has been stated above, it will be seen that the leading differences between the law' of England and Scot¬ land on the subject of marriage, are to be found both in its constitution and dissolution. Certain forms are required in England in order to constitute marriage, which are not es¬ sential in Scotland, provided the consent of parties is given clearly and seriously. To avoid the strictness of England, her subjects sometimes cross the border to contract an irre¬ gular marriage, which may be effected in Scotland in a few minutes. This may be prevented by the legislature en¬ acting that such a marriage should not be binding, unless preceded by the residence for a certain length of time of the English parties in Scotland; and a bill is at present be¬ fore parliament to accomplish that object, which will be ad¬ verted to in conclusion, if it be passed into a law before the publication of this volume. In regard to the dissolution of marriage by divorce, a woman cannot, except in extraordi¬ nary circumstances, sue in England for such a remedy ; and even the husband cannot, in that country, obtain it, except on the single ground of his wife’s infidelity, nor until he obtain a verdict for damages against her seducer; after which he may procure an act of parliament dissolving the marriage. The expense of this procedure is so great as to exclude the remedy of divorce from husbands in the lower ranks of England. The practical exclusion of the English wife from such a remedy, rests on the ground that her hus¬ band’s infidelity does not involve a family in calamities so great as those occasioned by the infidelity of the wife. In Scotland, malicious and obstinately continued desertion is regarded equally with infidelity as a violation of the mar¬ riage vow ; and the husband, as well as the wife, having un¬ dertaken that vow, is equally with her liable in the conse¬ quences of its violation; while the remedy of divorce can be obtained by all ranks, even as a matter of right, and in forma pauperis if necessary. Marriage may thus be said to be more easily constituted, and more easily dissolved in Scotland than in England; and yet Scotland is not parti¬ cularly remarkable for rash and inconsiderate marriages; neither do the number of divorces pronounced in that country lead to the inference, that the facility with which they are obtained tends to increase their number. Indeed, the number of Scotch divorces is very small; those at the instance of the wife not exceeding twenty annually; show¬ ing that divorce is a remedy not usually sought for by a wife, until her wrongs have become intolerable. The Bill referred to in the last paragraph has now been passed into a law ; by which it is enacted that after the 31st day of December 1856, no irregular marriages contracted in Scotland shall be valid, unless one of the parties had at the date thereof his or her usual place of residence there, or had lived in Scotland for twenty-one days next preceding such marriage ; while, if any parties contracting an irregular marriage shall, within three months thereafter, present a joint application for a warrant to register such marriage to the sheriff, the sheriff shall, on evidence, direct it to be registered, provided that one of the parties had lived in Scotland for twenty-one days next preceding such marriage, or had his or her usual residence in Scotland at the date thereof; and it is now no longer lawful to convict any HUS 57 parties of having irregularly contracted marriage, unless Huskisson there shall be adduced sufficient proof other than the ac- knowledgment of such parties, that one of them had at the v ^ . date thereof his or her usual residence in Scotland, or had lived in Scotland for twenty-one days next preceding such marriage. See Parent and Child. (m. l.) HUSKISSON, William, an able financier and states¬ man, was born in 1770, at Birch-Moreton, in Worcester¬ shire. After an excellent education at home, he went to Paris to study medicine, which he had chosen as his profes¬ sion. Accident, however, made him acquainted with Lord Gower, English ambassador in that city, and Huskisson, abandoning medicine, became his private secretary. Con¬ necting himself on his return to England with the I ory party, he held various offices under government, to which he made himself valuable, and indeed indispensable, from his knowledge of business, especially in the department of finance. After the death of Pitt he attached himself to the party of Canning, and distinguished himself by the part he took in the celebrated Bullion Committee, in which he sup¬ ported and enforced the views of Horner for an immediate resumption of cash-payments by the banks. In 1822 he succeeded Canning as secretary of state. For the remain¬ der of his public history see art. Britain. His death, which took place September 15, 1830, was accidental. At the opening of the Manchester and Liverpool Railway, he was run over by a train, and so severely injured, that he survived but a very short time. A collective edition of his speeches appeared in 1831. They do not exhibit any great eloquence strictly so called; but are distinguished for clear statement, lucid order, close reasoning, and a great mastery of details. The views, without being new or brilliant, are sound and comprehensive, and evidently the result of ma¬ ture thought and study. The conscientious fulness of the details makes them both instructive and interesting, even to readers of the present day. HUSS, John, the Bohemian reformer, was born at a village called Hussinecz, situated in that part of Bohemia which borders on Bavaria, on the 6th of July 1369. His parents were in humble circumstances, and he was in early life subjected to both toil and privation—a discipline which was probably not without its use in preparing him for his subsequent career. After passing through the initiatory branches of education, he entered the university of Prague, where he studied philosophy and theology under Stanislaus of Znaim, a man of liberal tendencies, and from whom Huss probably received the first impulse towards those opinions and efforts to which he owes his fame and his place in the history of the Church. Huss took his master’s degree in 1396, and in 1398 he began to lecture. In 1400 he was appointed confessor to Sophia, queen of Bohemia ; in 1401 he became president of the theological faculty in the uni¬ versity; and in 1402 he was selected to fill the office of preacher at the Bethlehem Chapel, an edifice which had been erected and endowed by John of Milheim, one of the royal councillors, and a wealthy citizen of Prague named Creutz, for the express purpose of facilitating the preach¬ ing to the people in the Bohemian tongue (verbum Dei communi populo civitatis in vulgari Bohemico ad prsedican- dum.) These appointments show in what respect Huss, though as yet but a young man, was held. His chap¬ laincy at the Bethlehem was especially important to him, as it afforded scope for the exercise of those peculiar powers of popular address which he possessed, and gave him opportunity of employing these in the promotion of those measures of reform on which his heart was al¬ ready set. Whilst yet a student at the university, Huss’s earnest and religious mind had been grieved by the prevailing levity and immorality of the clergy, as well as the gross supersti¬ tion, ignorance, and vice of the body of the people. I he H VOL. XII. 58 HU Huss. times in which he appeared were those of the deepest me- diaeval darkness, when boundless corruption reigned through¬ out the Church, when anarchy and discord were threaten¬ ing her with ruin, and when almost every man in whose bosom a regard for the interests of religion and moiality re¬ mained, was compelled to assume the position ot a censurer and a reformer. Mosheim observes, that i no teacher or writer of any eminence in this century (the fifteenth), can be named, who does not plainly and greatly lament the miserable state of the Christian Church, and anticipate its ruin, unless God should interpose for its rescue.”1 Several had already appeared in Bohemia, who had uttered ener¬ getic testimony against the prevailing corruptions. Milicz of Kremsia, Conrad of Waldhausen, John of Steikna, and Matthias of Janow, had formed a succession of witnesses whose unwearied and vehement denunciations alike of the misconduct of the clergy and the corruptions of the popu¬ lace, had been gradually leavening the minds of the com¬ munity with sentiments favourable to a better state of things. In the footsteps of these men, Huss, deeply imbued with their spirit, and familiar with their opinions, enthusias¬ tically followed, and by his eloquent, empassioned, and fear¬ less discourses at the Bethlehem Chapel, greatly extended the movement they had commenced. At first, indeed, he confined himself to topics affecting only the laity, but from these he advanced boldly to attack the sensual and vicious habits of the clergy. The result was, that he drew around him a small but attached and congenial community from among the former, while he incurred the bitter hatred and opposition of the latter. It is true, that at first his efforts for reform seemed to be conducted under the sanction of his ecclesiastical superiors. A young nobleman, Sbynko, or Zbynek, of Hasenburg, was at that time archbishop of Prague; and being disposed to introduce order into his diocese, and to discourage the gross superstitions that were bewildering the people, he availed himself of the knowledge, influence, and zeal of Huss for this purpose. For some time, therefore, the latter worked under the protection and with the approval of his diocesan; but the motives, designs, and the spirit of the two men were so different, that it was not possible they should continue very long to pursue a common course. Zbynek was a man of the world, whose tastes were more for military operations than for ecclesiastical or spiritual functions, and whose de¬ sire for reform in his diocese was kindled by no higher feeling than that which prompts a general to enforce order among his soldiers. Huss was a man fired with religious zeal, caring little for secular interests, devoted to the service of morality and piety, and whom nothing could satisfy but a return to such a state of things as the high standard of spiritual Christianity sanctioned. Between two such men there was hardly anything in common ; and though peculiar circumstances might impel them in a common direction for a season, no sooner wrould the influence of these be removed, than their paths must necessarily diverge ever more and more widely from each other. As it happened, hardly seven years had elapsed when their relations were completely changed; the patron had become the persecutor, and the humble priest was agitating a reform which not only roused the indignation of the archbishop of Prague, but occupied the attention, and perplexed the counsels of the supreme Pontiff himself. Several circumstances conspired to push Huss forward in the career on which he had entered. Already imbued with principles derived from the study of the sacred Scriptures, the writings of Augustine, and those of Milicz and Matthias of Janow, his mind received a still more decisive impulse in the direction of reform from the perusal of the writings s s. of Wycliffe. With some of these he had become acquainted Huss. as early as 1391 ; but it would appear that it was not till a i later period that he experienced the full amount of their influence on his mind. By the perusal of them he was completely won over to the views of the Realists in philo¬ sophy ; and though he did not embrace all Wycliffe’s theo¬ logical opinions, he undoubtedly owed to him much spiritual enlightenment,—a benefit which he was prompt publicly to acknowledge whilst preaching, commending them to the people as full of truth, and frequently declaring that he wished his soul after death to go to the same place whither that of Wycliffe had gone.2 It was as a defender of Wycliffe that Huss first came into collision with Archbishop Zbynek. In 1406, the latter began to institute proceedings for the sup¬ pression of the Wycliffite heresy in his diocese, and even went the length of banishing or committing to the flames some who refused to recant the opinions they had embraced from the teaching of the English reformer. Against this cruelty Huss, though not himself prepared to concur in all the opinions for which these men suffered, indignantly pro¬ tested. “ What sort of thing is this,” he wrote to the arch¬ bishop, “that men guilty of incest and every kind of crime pass with impunity, whilst humble priests, plucking out the thorns of sin, fulfilling their duty, well affected towards your rule, not following avarice, but gratuitously, for God’s sake, labouring in the gospel, are cast into prison as heretics, and suffer banishment for preaching the gospel itself?”3 To these remonstrances Zbynek seems at first to have listened ; at least he did not at this time pursue his perse¬ cution of the Wycliffites, nor does Huss appear to have in¬ curred his displeasure by the zeal he had shown on their behalf. A more serious cause of quarrel arose out of the part which Huss took in the disputes which were then agi¬ tating Christendom, in consequence of the Papal schism. The archbishop had espoused the side of Gregory XII. in opposition to Wenceslaus, the king of Bohemia, and Huss, taking the same side as the king, employed his influence in securing support for his cause. Not long before this an event had occurred, very much through Huss’s efforts, which greatly increased his power of serving the king in such an emergency. The university of Prague had hitherto numbered among its students a large body of Ger¬ mans, who indeed formed the majority, and to whom had been conceded the privilege of three votes in all questions affecting the interests of the university, whilst the native Bohemians possessed only one. Against this, as an act of injustice, Huss, supported by his friend Jerome of Prague, and by the patriotic feeling of many of their countrymen, had at length successfully struggled: by an edict of the king in 1409, the relative weight of the parties was reversed, three votes being given to the Bohemians, and only one to the Germans. In consequence of this the latter seceded in a body, to the number, according to the lowest estimate, of 5000. Huss was immediately after elevated to the post of rector of the university ; but whilst he was thus enabled to serve the side of the king in his contest with the arch¬ bishop and clergy more efficiently, the part he had taken in the measures which resulted in the secession of the Germans, materially contributed to his own subsequent in¬ jury. He had thereby not only given mortal offence to the archbishop and the clergy of Bohemia, but he had multi¬ plied enemies in every place to which the dispersed students and professors betook themselves; whilst, at home, the loss occasioned to the city by the withdrawal of so large a num¬ ber of its inhabitants turned from him the favour of the citizens, and facilitated the attempts of his enemies to stir up a party against him. The archbishop now resolved to proceed vigorously for 1 Cent. 15, ch. 2. 2 JEnece Sylvii Hist. Bohem., c. 35 ; Herr von der Hardt, Act. Cone, iv., 314. 3 Palacky Gesch. von Bohemia, bd. iii., § 223, cited by Neander, vol. ix., p. 341, Torrey’s Transl. H U the suppression of the reformers. In 1410 he procured from the pope, Alexander V., full powers to prohibit preaching in private chapels, and to consign the writings of Wycliffe to the flames. Huss, in the face of this, boldly continued to preach as before at the Bethlehem Chapel, where he was still listened to by admiring crowds. This provoked the archbishop to accuse him to the pope of heresy; in consequence of which he was summoned to appear at Bologna, before Cardinal Otto of Colonna, to answer for himself; and, on his failing to appear, was excommunicated. This sentence was renewed by Cardinal Brancas, to whom the case had been referred for reconsideration ; but, though Zbynek endeavoured to carry it into effect, the influence of Huss with the king and the people of Bohemia was still so great that he was compelled to relinquish the attempt, and even to recal his accusation of heresy, and request the pope to remove the ban under which Huss had been laid. Archbishop Zbynek died in 1411, and was succeeded by Alric of Unitzow, a man wholly uninterested in religious disputes, and devoted to the interests of the king. Under his sway Huss might have remained unmolested, had it not been that events occurred which compelled him to assume even a still more decided posture of opposition to the cor¬ ruptions of the Papacy than he had hitherto assumed. In 1412 the pope issued a bull commanding a crusade against King Ladislaus of Naples, and proclaiming full indulgence to all who should take arms in this crusade, or furnish mo¬ ney for carrying it on. This roused Huss’s indignation, and he attacked the bull both with voice and pen. In this he was seconded only too zealously by his friend Jerome, who, not content with exerting his fiery eloquence on the subject, proceeded to parade the papal rescript through the streets suspended to the neck of a common strumpet, after which it was publicly burnt. These proceedings called forth, as might be expected, the anger of the pope; they were even too much for the king; and, accordingly, when Huss was again placed under the papal ban he was obliged to yield. He left Prague in 1413, and retired to Hussinecz, having first appealed from the pope to Christ himself, and defended his views in a work entitled De Ecclesia. At Hussinecz he employed himself in writing letters to his friends, in composing some additional expositions of his opinions, and in occasionally preaching to the peasantry in the open fields. In the meanwhile his enemies had not forgotten him, or relinquished their determination to destroy him. In 1414 the council of Constance was opened, and thither Huss was summoned by the Emperor Sigismund to answer on a charge of heresy. Though knowing that he was about to appear before “ numerous and mortal enemies,” he went without fear, having confided himself wholly to God and to his Sa¬ viour, from whom he besought wisdom and prudence, that he might answer his accusers, and stand firm for the truth.1 Before leaving Prague, however, he sought to fortify his innocence by submitting to an examination be¬ fore the papal inquisitor, who gave him a certificate that he found nothing heretical in him. He also secured from the emperor a letter of safe-conduct, and from the pope the strongest assurances of protection. Accompanied by seve¬ ral Bohemian noblemen, he left Prague on the 11th of October, and reached Constance on the 3d of November. For the first four weeks after his arrival nothing was done or said touching his case. Expecting to be allowed to ad¬ dress the council, he employed the interval in preparing his defence. But his enemies had no intention of allowing him such an advantage. On the 28th of November he was seized and imprisoned in a loathsome dungeon. In conse¬ quence of the interference of the emperor, he was some weeks after transferred thence to a more salubrious apart- S S. 59 ment, where he remained a close prisoner till the 24th of Huss. March. After this he was, in spite of the remonstrances of ' the Bohemian barons, removed to the Castle of Gottleben, where he was treated with the utmost severity, under which his health, already greatly enfeebled, completely sank. At length, emaciated by sickness and exhausted by suffering, he was brought before the council, but it was only to be treated as one already condemned. At his first appearance, which took place on the 5th of June, whenever he attempted to speak in his own defence, he was assailed by violent out¬ cries, amidst which not a syllable he uttered could be heard. At his second and third hearing, which took place on the 7th and 8th of June, the presence of the emperor prevented the tumultuous proceedings which had disgraced the former assembly, but Huss was still rather harassed by his assail¬ ants than allowed freely and fairly to answer for himself. The council persisted in imputing to him errors which he repeatedly declared he never held, and they would hear of nothing but that he should solemnly recant and abjure them. In vain did he ask “ How can I abjure what I never held ?” The council was inexorable, and he was remanded to pri¬ son, there to make up his mind between recantation and death. Repeated efforts were made by emissaries of the council to induce him to the former; but the spirit of the martyr rose within him as he saw his end approaching, and he stedfastly refused to swerve from the path of consistency and truth. “ I write this,” says he in a letter to his friends at Prague, “ in prison and in chains, expecting to-morrow to receive sentence of death, full of hope in God that I shall not swerve from the truth, nor abjure errors imputed to me by false witnesses.” The sentence he expected was pronounced on him on the 6th July, in the presence of the emperor and the council. When it was read to him he fell on his knees and said, “ Lord Jesus! forgive my ene¬ mies ; as Thou knowest that I have been falsely accused by them, and that they have used against me false testimony and calumnies; forgive them for the sake of Thy great mercy.” Loud laughter rang through the hall, from the assembled prelates, as this prayer went up for them to hea¬ ven. They then proceeded to degrade Huss from his sacerdotal rank. For this purpose he was dressed in the robes of a priest, the different parts of which were then successively taken off him, with set forms of expression. When this was over, and the tonsure had been obliterated from him, a cap painted with figures of demons was placed on his head, and the bishops said, “ Now we devote thy soul to the infernal devils.” “ But I,” exclaimed Huss, raising his eyes to heaven, “commend my soul, redeemed by Thee, into Thy hands, O Lord Jesus Christ!” He was then led to the place of execution. When fastened to the stake he said, “ I willingly wear these chains for Christ’s sake, who wore still more grievous ones.” Once more he was ad¬ monished to recant, but his reply was, “ What error should I recant when I am conscious of none ? The chief aim of my preaching was to teach men repentance and the forgive¬ ness of sins, according to the truth of the gospel of Jesus Christ, and the expositions of the holy fathers; therefore am I prepared to die with a joyful heart.” The fire was then kindled. As its smoke and flames rose around him, Huss began to shout, “Jesus, son of the living God, have mercy on me.” Twice did he utter this, but before he could finish it a third time, his voice was stifled in the flames which the wind drove towards him. Still his lips moved as in prayer, and the calm bearing of the dauntless confessor of Christ continued to mark his countenance to the last. When the flames had done their office, his ashes were collected and cast into the Rhine, that no relics of him might remain. “ But the miserable precaution was without any effect, since his disciples tore up the earth from the spot of his martyr- 1 See his letter addressed to the Bohemians before commencing his journey. Bonnechose Lettres de Jean Hus, p. 82. 60 HUS Hussars dom, and adored it with the same reverence, and moistened II it wdth those same tears, which would otherwise have sanc- Hutchin- tified his sepUlchre.” Waddington’s Hist, of the Church, son* vol. iii., p. 192. See also Neander’s Church Hist., vol. ix., pp. 319-506; Gieseler’s Church Hist., vol. v., pp. 103-122; Bonnechose Reformateurs avant la Reforme, &c., 2 vols. (w* L*A’) HUSSARS, a name given to the national cavalry of Hungary and Croatia. They were first raised in 1458, and received their name either from the method in which they were called out, or from the Tartar uswar, which sio-nifies cavalry. In the armies of modern Europe hussars are light horse, and differ from light dragoons only in some peculiarities of dress and equipment. HUSTINGS (from the Saxon word huslinge, house of trial), a court annually held in Guildhall before the lord mayor and aldermen of London. Its antiquity appears from the laws of Edward the Confessor. Some other cities have likewise had a court bearing the same name, as Win¬ chester and York. This term is now applied to those tem¬ porary structures where elections are conducted. HUTCHESON, Francis, the father, or at least the re¬ viver, of speculative philosophy in Scotland, was born, August 8, 1694, in Ireland, but in what part of that coun¬ try is unknown. His father was a minister of the Presby¬ terian Church, and Hutcheson himself studied theology in Glasgow with the view of following out his father’s career. On taking licence he became pastor of a Presbyterian con¬ gregation in the synod of Ulster, and while there published his Inquiry into the Original of our Ideas on Beauty and Virtue, a work which made his name widely known, and introduced him to the notice of King, the archbishop of Dublin, himself well known in his day as a writer on ethi¬ cal subjects. In 1728 Hutcheson published his essay on the Nature and Conduct of the Passions and Affections, in virtue of which he was in the following year promoted to the chair of moral philosophy in Glasgow. His next works were mere text-books for the use of his classes, and were respectively entitled Synopsis Metaphysicce Ontolo- giam et Pneumatologiam Complectens; and Philosophies Moralis institutio Compendiaria, Ethices et Jurispru- dentiee Naturalis principia Complectens. The work on which his chief fame as an ethical writer depends, how¬ ever, did not appear till after his death, which took place at Glasgow in 1747. It was published in 2 vols. 4to, under the title of System of Moral Philosophy, by his son Dr F. Hutcheson, and was prefaced with an excellent biographical sketch of the author by Dr Leechman. For analyses of Hutcheson’s system, and the place it holds in the history of speculative philosophy, see Preliminary Dissertations I. and II. prefixed to this work, by Dugald Stewart and Sir James Mackintosh respectively. HUTCHINSON, John, a philosophical and theological writer of the last century, was born in 1674 at Spenni- thorne, in Yorkshire. He received an excellent education from a gentleman who lodged with his father, and after leaving the paternal roof served as steward in several fami¬ lies of rank and wealth. His best friend, however, was the Duke of Somerset, who, when he was himself made Mas¬ ter of the Horse, appointed Hutchinson his riding purveyor. This office afforded him great facilities for his favourite study of natural history, and enabled him to make a large and valuable collection of fossils. These, along with his M.S. notes on them, he made over to Dr Woodward, the duke’s physician, to arrange and publish. Woodward, however, bequeathed both the fossils and their collector’s injunctions to the university of Cambridge. Hutchinson construed this act into an attempt to deprive him of his fame as a geologist, and did his best to expose Woodward’s conduct in his Moses' Principia, of which the first part saw the light in 1724. In this strange work the author, after HUT giving his version of the Woodward affair, gravely set Hutchin- about disproving the Newtonian doctrine of gravitation. 8on- Three years later he published the second part, in which he followed up his attack on Newton, and quoted Scripture in proof of the existence of a plenum in opposition to the doc¬ trine of a vacuum, on which the Newtonian philosophy is based. From this time till his death he continued to pub¬ lish at intervals volume after volume in defence of his views. He died August 28, 1737. Eleven years after his death his collective works were published in 12 vols. 8vo, under the title of The Philosophical and Theological Worhs of the late truly learned John Hutchinson, Esq. In the pre¬ face to this edition there is an elaborate defence of Hutch¬ inson, and an exposition of his views by Spearman and Bate, the literary executors of the author. A good sum¬ mary of these views will also be found in a little book called Thoughts Concerning Religion, published at Edin¬ burgh in 1743. The gist of these is that in the Bible is contained a complete and infallible system of natural his¬ tory and philosophy as well as of religion and theology. This, however, is to be gathered not from the ordinary translations of the Bible, but from the Hebrew original. That language, according to Hutchinson, is the only com¬ plete and perfect form of human speech, and was on that account chosen by the Almighty as his instrument of com¬ munication with man. But it is not to be interpreted ac¬ cording to the literal meaning of the words. The true is the typical sense, which can only be reached by a deep ac¬ quaintance with the etymology of Hebrew. Every root of that tongue, on the Hutchinsonian theory, contains hidden meanings, and symbolizes some intellectual object. This elastic machinery put into his hands the means of wringing from the Hebrew text interpretations that harmonized per¬ fectly with his system. An illustration will show more clearly what is meant. “ The hawk,” says Hutchinson, “ is eminent for seeing ; so hawk and seeing are the same word; and the same idea may be in two things in other respects quite different—e.g., the atoms of light move in a line, like marbles in a groove; so do the storkened masses of air which are darkness, they are continuous in a line ; the first impels the second, and so on that the motion of the first mass or grain puts the whole line into motion ; and this motion gives the same idea when you consider the coagulated grains of air thus following each other, as when the atoms of light follow and drive forward each other ; and so a word may be translated, as is often the case, to signify direct contraries, as irradiate is made to do in Hebrew.” On this principle Hutchinson evolves his system, in which, rejecting the received doctrines of gravitation, attraction, magnetism, and electricity, and denying the existence of a vacuum, he maintains that the operations of nature are car¬ ried on by the three agents of fire, light, and spirit. Now these three agents, which are in themselves only a modifi¬ cation of one and the same substance—the air—Hutchinson holds to typify the three persons of one and the same es¬ sence—to wit, the Trinity. Carrying out this principle of symbolism, he maintained that all the ceremonies enjoined on the Old Testament Jews were adumbrations of the life and sufferings of the Saviour, and that the Jews, in know¬ ledge of this, observed these rites in the same manner and spirit as the followers of Christ afterwards obeyed the commands and precepts that fell from the lips of their Lord. Though Hutchinson can scarcely be regarded as having founded a distinct sect, yet many able men since his days have been found to accept and maintain these doctrines. Even now, though their numbers are small, they are not extinct. In the list of those who openly defended them are found the names of Robert Spearman and Julius Bate, who superintended the third edition of Hutchinson’s works; Dr Horne, bishop of Norwich, who afterwards, however, be¬ came a convert to the received views ; William Jones, the H U T Hutton, biographer of the bishop ; Lee, the author of Nature's Cha- Charles. racterislics of Truth ; Hodges, at one time provost of V'-"-'' Oriel College, Oxford ; Parkhurst, the lexicographer; and several distinguished divines of the Episcopal and Presbyterian churches of England and Scotland. HUTTON, Charles, a celebrated English mathema¬ tician, was born at Newcastle-upon-Tyne, Aug. 14, 1737. His father, who to other duties added that of an inspector of mines, gave him such an education as his means allowed ; but the school to which he sent his son was a bad one, and the young Hutton soon distanced his teacher. Hi& know¬ ledge of the higher mathematics he acquired without help from any one. At the age of eighteen he obtained an ushership in a school at Jesmond, and when his principal was promoted to a living in the church, Hutton was ap¬ pointed to succeed him. Among his pupils at this place was John Scott, afterwards Lord Eldon, chancellor of Eng¬ land. In 1760 he married, and began the work of tuition on a larger scale in Newcastle, eking out his income by con¬ tributions to the Ladies Diary, the Gentlemans Magazine, and other works of that class. His first acknowledged work, however, is his Practical Treatise on Arithmetic and Booh- Keeping—the work of a master-hand, which threw into the shade all previous treatises on these subjects. Next ap¬ peared, in 1771, his Theoretical and Practical Treatise on Mensuration. In this year the bridge at Newcastle hap¬ pened to be destroyed by an unusually heavy flood. Hut¬ ton drew up a plan, providing against the recurrence of such a calamity, which in the ensuing year he enlarged and pub¬ lished under the title of Principles of Bridges, and the Mathematical Demonstration of the Laics of Arches. In 1773, after a severe competitive trial, he was chosen profes¬ sor of mathematics in the Royal Military Academy of Wool¬ wich. Made a fellow of the Royal Society in 1774, he ful¬ filled the duties of foreign secretary to that learned body from 1779 to 1783. During this period the Royal Society bad nearly been dissolved from the discontent called forth by the conduct of Sir Joseph Banks, the president. He was accused of introducing into the body ignorant men of rank and wealth, and overlooking those whose claims to the honour were founded only on real scientific, especially ma¬ thematical, genius. Hutton found himself accused of ne¬ glecting his duties of foreign secretary, and indignantly re¬ signed. He drew up a defence of his conduct, however, which was fully sustained by the vote of the society. (A detailed account of this unhappy affair is given in Kippis’ Observations on the late Contests in the Royal Society, Lond. 1784.) The treatment of Hutton was peculiarly un¬ gracious, especially if account be taken of the solid services which he rendered to the society. Besides contributing a large number of papers to its Transactions, he had gone through the enormous labour of making all the mathemati¬ cal calculations for Maskelyne’s experiments at Schehallion, in Perthshire, for determining the mean density of the earth. These labours were fully appreciated by the savans of Edinburgh, who in 1779 procured for Hutton the degree of LL.D. from the university of that city. For the next six or seven years, Hutton’s works were almost entirely mathematical in their character, comprising his Mathema¬ tical Tables ; Tables of the Product and Power of Num¬ bers, &c., which he followed up in 1795 with his Mathe¬ matical and Philosophical Dictionary, the most valuable contribution to scientific biography that has yet appeared in England. Perhaps the most laborious of all Hutton’s works was that which he next undertook, viz., his abridge¬ ment of the Philosophical Transactions. In this he was assisted by Drs Shaw and Pearson, who relieved him of the historic and literary parts of the task, while he reserved to himself the mathematical and scientific portions. This un¬ dertaking was completed in 1809, and filled 18 volumes in 4to. Hutton received L.6000 for the share he had taken HUY 61 in it. Soon after this lie found himself obliged by bad Hutton, health to resign the appointment he had so long and ably ames held at Woolwich. A retiring pension of L.500 a-year as- H(Jsum sured him that his services had been duly appreciated by . the Board of Ordnance. In 1819-20 he began a cone- spondence with Laplace to vindicate his claim to notice in that philosopher’s account of the experiments on the density of the earth; and in the Connaissance des lemps for 1823 he had the pleasure of seeing that his labours on that diffi¬ cult problem were amply acknowledged by the great trench philosopher. Hutton had reached his eighty-sixth year, when he died Jan. 27, 1823. All the biographical notices of Hutton are unanimous in describing him as one of the most skilful of teachers, and the most amiable of men. His modesty and simplicity were as remarkable as his intellectual gifts. To his friends and pupils he exhibited a warmth of personal affection that at¬ tached both to him in a very rare degree. It was also with him a sacred duty to seek out the poor and unbefriended student of science, and promote and otherwise assist him to the best of his power. Hutton wrote many other works besides these mentioned above ; but we need only add to the list his Conic Sections, and his English version of Montucla’s Recreations in Ma¬ thematics and Natural Philosophy. A catalogue raisonne of his works will be found in the Biog. Univers., and in his Life by Olinthus Gregory, his successor at Woolwich. Hutton, James, M.D., the author of the Huttonian theory of the earth, was born at Edinburgh, June 3, 1726, and died in 1797. After passing through the ordinary courses at the High School and University of his native city, he be¬ gan the study of the law, but soon exchanged it for the more congenial pursuits of natural science. He studied medicine for three years at Edinburgh, then for two in Paris, and finally graduated at Leyden. Returning to Lon¬ don in 1749, he began to practise as a physician, but with such small success that in the following year he removed to Scotland, where, inheriting his father’s estate, he devoted himself to agriculture. A residence in England, and after¬ wards in the Low Countries, perfected him in that art as then understood, and enabled him to introduce those im¬ provements into the husbandry of Scotland that have made the agricultural system of that country the most perfect now in use. The last thirty years of his life were devoted chiefly to those geological and meteorological studies of which he embodied the results in his Theory of the Larth, and his Theory of Rain. The illustrations of these works by Playfair are justly regarded as among the finest speci¬ mens of philosophical writing that the English tongue has to show. The value of Hutton’s contributions to natural science, and his place in the history of that branch of phi¬ losophy, are discussed in the sixth Preliminary Dissertation to this work by Professor Forbes, par. 591. Hutton’s Life has been written by his friend Playfair, in Edin. Trans¬ actions, vol. V. HUY, a strongly fortified town of Belgium, capital of a cognominal arrondissement in the province of Liege, 17 miles S.W. of the town of that name. It stands on both sides of the Meuse, its two parts being connected by an ancient stone bridge. It has a strong citadel, cathedral, collegiate church, and town-hall. The chief manufactures are linen, paper, leather, and cast iron. It has also a consi¬ derable trade in corn, coal, iron, wine, &c. Pop. 9000. HUYGENS, Christian. See historical part of art. Astronomy ; and the fourth and fifth Preliminary Disser¬ tations to this work. HUYSUM, Jan van, one of the greatest fruit and flower painters, was born at Amsterdam in 1682. He learned his art from his father Justus van Huysum, a painter of very considerable merit, but whose fame has been com¬ pletely lost in that of his son. After thoroughly mastering 62 II Y B Hyberna- the technicalities of his art, and the styles of the greatest tion. masters of that branch of it in which he himself became un- rivalled, Van Huysum betook himself to the study of nature. He sounded her most secret depths, and reproduced the brightest tints of her brightest ornaments with a skill and truthfulness that sometimes deceived the keenest eyes. He always chose the most gorgeous flowers to paint from, and was careful to watch the hour of the day at which their lustre was most brilliant. He heightened the effect of his flower- groups by placing them in vases of the most graceful shape, and working out the ornaments traced on them with the same exquisite finish as he put upon the flowers themselves. When his fame was fairly established he received almost fabulous prices for his works ; and was thus enabled to be¬ stow upon them the highest amount of care and finish. He was very jealous of his fame, and would allow no one to enter his studio while he was at work. It was believed that he had some secret in the mixing of his colours, which ena¬ bled him to preserve the brilliancy of his tints; but this, if it ever existed, perished with him. There are some very good specimens of Van Huysum in English galleries, and his pieces always fetch very high prices in the market. Van Huysum died in England in 1749. HYBERNATION, the term employed by naturalists to denote that state in which certain animals pass a portion of each year in a more or less complete suspension of their active functions ; and as this state has most frequently been observed during the rigour of winter, it has been designated Hybernation, from the Latin word hyberna. The continued application of cold to such animals will induce a suspension of their active faculties, and artificial heat will dissolve their hybernation : yet this state cannot be altogether the consequence of a low temperature; for hybernation is observed, in tropical climates, in some insec¬ tivorous mammals and reptiles, when the dry heats of those regions abridge the supply of suitable food. These facts would show that hybernation is also caused, and perhaps chiefly so, by the want of due aliment to keep up or reno¬ vate the irritability of the vital organs. Without some such law, the existence of insectivorous animals, both in high lati¬ tudes and in tropical climates, would have been impossible ; and we must regard hybernation as one of those admirable adaptations of special means to an important end, which the history of animated nature so frequently presents. In the most complete hybernation the animals, on the approach of that season, retreat to their places of temporary concealment, their vital functions begin to be more slowly performed, they cease to eat, breathe more slowly, and finally their respiration would appear to be totally suspended, while the movements of the heart become more languid, and are performed at much longer intervals of time ; the animal heat is much diminished, and finally, insensibility is pro¬ found. In such cases the small degree of oxygenation ne¬ cessary to maintain sufficient irritability in the muscles of the heart to prevent their absolute rest is probably supplied by the dermoid surface of the animal. In our climates the bat and the hedgehog present the best known instances of hybernation among mammals. In them all the vital functions, except a very languid circula¬ tion of the blood, appears to be totally suspended at that season, when a want of insect food would condemn them to starvation. In some other European mammals the hyber¬ nation, though somewhat analogous, is less complete. This is the case with certain frugivorous species that lay up stores of vegetable food in their winter domiciles; as the dor¬ mouse, the squirrel, and the marmot. In them the insen¬ sibility would appear to be less profound, and the respira¬ tion never wholly suspended, though much diminished in frequency. A good observer of the habits of the Alpine marmot, Professor Mangili, calculates that during its six months of torpidity, this animal only makes 71,000 inspira- H Y B tions ; while, in its active state, it makes no less than 72,000 Hybla in 48 hours. The large collection of dried grass which the ^ «- v-» marmot lays up in its hybernaculum is probably intended for consumption in its occasional revivals during its long hybernation ; although Schinz supposes that this ample store of food is untouched until its full restoration to activity on the return of warm weather in April, which he supposes to take place before the new grass is sufficient for its wants. It is certain, however, that tame marmots, when awakened by artificial heat, eat whenever they are roused up. Mam¬ mals of other countries, that lay up similar stores of food, have similar habits and hybernations ; as various genera of the family Mm,—Merion canadensis, and M. labradorius; Aricola ceconomica, or economic mouse ; Cricetus vulgaris, or hamster, &c. These animals probably have the same kind of hybernation as the marmot. The common bear, the teeth of which prove it to be chiefly a vegetable feeder, passes a considerable portion of the winter without food, and in profound sleep. All these animals become fat in autumn, which seems to be intended to supply the waste of the sys¬ tem during their hybernation. In hot climates certain mammals also undergo hyberna¬ tion. Thus the three species of Centenes or tenrec of Ma¬ dagascar, which have much analogy with our hedgehog, being like it furnished with a spiny covering, and living on insects, sustain a torpidity of three months, according to Brugiere, at the season when the dry heats of that cli¬ mate cut off their supply of insect food. Insectivorous birds are less subject to hybernation than mammals in cold climates, because they possess the power of an easy migration to regions where insect food is easily procured. Such birds are migratory; as are many of our land birds. Yet the writer of this article has known in¬ stances in these islands of the hybernation of Rallus crex, or land rail, and the swallow. Cuvier not only mentions the hybernation of Hirundo riparia or sand martin, but expresses his belief of that bird being found hybernating below the surface of water in marshes. The hybernation of many cold-blooded animals is with us very complete. Snakes, lizards, toads, and frogs lie in a state of complete torpor during the winter months, while the lips of the latter are glued together, and they are buried in mud at the bottom of stagnant water at that season. They cannot breathe during that process ; but probably the small quantity of oxygenation required by their system is sufficiently obtained through their skin. In North America, as with us, snakes are hybernating animals, though in warmer regions they are active through¬ out the year. The same takes place with lizards. In these cases, hybernation seems rather, however, the consequence of the wrant of due nutriment than of mere cold. A fact men¬ tioned by Von Humboldt confirms this. The largest spe¬ cies of serpent, the Boa murina, during the long rains that inundate the immense deserts of Central South Ame¬ rica, remains buried in the soil until the mud, dried by the heats which invariably succeed the rainy season, cracks, and emancipates the imprisoned monster from his earthy tomb. Yet in Surinam and Brazil, this boa, like other ser¬ pents there, passed the whole year in uninterrupted acti¬ vity. (t. s. t.) HYBLA, in Ancient Geography, the name of several cities of Sicily. Two of these places were of considerable note. The most important of them was distinguished by the epithet Magna or Major. It stood on the southern side of Mount iEtna, in a district of great fertility. The only event of interest in its history was its revolt from the Romans in the second Punic War, and its speedy recapture by that people. Its site has not yet been fixed with posi¬ tive certainty. Cluverius places it at Paterno, about 12 miles from Catania, and his conjecture has been followed by the best modern geographers. Hybla the Little was H Y B Hybrid, identical with the Greek colony of Megara, which was thence called Megara Hyblaea. It stood on the sea-coast in the territory of the Greater Hybla. In its neighbourhood were the Hyblaei Colles, which produced great quanti¬ ties of honey of proverbial excellence. The town itself was destroyed by Gelon of Syracuse, after an existence of about two centuries and a half, and its inhabitants were dispersed. In the second Punic War it again appears in history as making common cause with the Syracusans against Marcellus, by whom it was taken and destroyed. The ruins of this Hybla were visible till within a compara¬ tively recent period at the mouth of a small stream called the Alabus, now the Cantaro. Near the site of the old town is the modern village of Melilli, which is said to take its name from the honey for which the surrounding hills were once so famous. HYBRID, a term derived from the Greek a mule, is used by naturalists to denote the offspring of two animals or plants of different species. Of these the best known and most useful is the progeny of the horse and the ass, which has from remote antiquity been largely employed in the East as a beast of burden, and is well known in Europe as the most sure-footed of domestic quadrupeds. The male parent may belong to either species ; but the offspring of the mare and the he-ass is superior in size and strength to that of the stallion and the she-ass. To the former Buffon restricts the name of mulct or mule, and names the latter bardeau. Hybrids have also been produced between the dog, the wolf, the jackal, and the fox ; between the lion and the tiger; between the sheep and the goat. These may be considered as hybrids between allied species, or may be termed specific hybrids. But hybrids are known also be¬ tween the stallion and the cow, the cow and the stag, the antelope and the goat; and even between the bull and the sheep, animals belonging to different genera, which may be termed generic hybrids. Other classes of animals afford instances of hybrid pro¬ geny. Specific hybrids occur among birds ; as between the hooded and carrion crows, the goldfinch and the canary, the latter and the linnet, the w'ood-grouse and the black¬ cock, the goose and the swan; and it is said that generic hybrids have occurred between the pheasant and the Tringa pugnax or reeve. Among fishes, hybrids might have been supposed to be more common than among the classes al¬ ready noticed; because their spawn must be fiequently mixed; yet such are not very common, though they are found among Salmonidce, Cyprini, and a few other genera. Among reptiles, hybrids have occurred between the toad and the frog; but Spallanzani was unable to obtain them between the frog and the newt, or between the latter and the toad. In the division of insects, hybrids, both specific and generic, are not unknown; as among different species oi'Papilionidce and Chrysomelidce; and they are said to have arisen from the congress of Melalonthci agricola with Geto- nia histci, of Cantharis melanura with Eluter niger. In the vegetable kingdom, although the well-known ex¬ periment of grafting different plants on the same stock, when each produces its own fruit, would show that the food of plants is nearly similar; and although the pollen of one flower is apt to be carried to the pistil of a different flower by the winds, or by insects, yet hybrid plants are rarer in a state of nature than we might have expected. But in our conservatories, where many different plants are in juxtaposi¬ tion, and more especially if artificial impregnation be adopted, hybrid plants are produced. I his is well known to florists, who have thus obtained varieties of the rose, calceolaria, &c. But the comparative rarity of hybrids among native plants shows that there is some natural impediment to the pro¬ duction of hybrids in the vegetable kingdom. With regard to animals, nothing is better established than that individuals of different species, when left to them- H Y D 63 Hyde, Edward. selves, do not voluntarily copulate. Thus, the stallion will Hydaspes not cover the ass if a mare be present; and to effect copu¬ lation of the mare with the he-ass, she must be blindfolded. Yet we have seen the stallion without repugnance cover ^ the female mule when in heat, and the she-mule readily receive the ass. The hybrids between the zebia and the ass are readily produced also, if the natural mates of either be not present. The curious experiments of Buffon prove, that individuals of different species are not naturally in¬ clined to copulate. He reared in the same kennel the young of both sexes of the dog, the fox, and the wolf; and when young they played familiarly together ; but the fe¬ males of each species, when in heat, exhibited insurmount¬ able repugnance to receive the males of the other species; and mortal combats, instead of copulation, took place be¬ tween different sexes of the different species. John Hun¬ ter also found that when he had a she-wolf lined by a grey¬ hound, it was necessary to hold her fast; and, although during copulation she remained pretty quiet, immediately after she attempted to attack the greyhound. It is well known, that hybrid animals are generally bar¬ ren ; and this seems a provision of nature to prevent the confusion of species. There are a few instances on record of common mules producing young. Both the male and female mule have perfect generative organs, and are un¬ commonly salacious; yet their congress with each other is almost always sterile. It has, however, been long known, that the mule can engender with the mare, as is mentioned by Aristotle, who states also, that the she-mule conceives, but very seldom brings her foetus to perfection. We have once seen a foal that was dropt by a female mule; but the circumstance is very rare. The fertility of certain other hybrids with males of the pure species is noticed by Buffon, in his Dissertation on Mules, and in the celebrated experi¬ ments of John Hunter. Hunter submitted the female hy¬ brid between a jackal and a dog to a male terrier, and the hybrid between a dog and a wolf to a male greyhound ; and puppies in both instances were produced. Hence he in¬ ferred, that the dog, the jackal, and the wolf, belong to the same species. This conclusion is perhaps not so decisive as that great anatomist supposed : for may it not be merely the effort of nature to return to the pure breed ? Yet this argument, with the total want of any wild prototype of the domestic dog, unless we derive it from the wolf, the jackal, or the fox, would favour the idea of their original identity. The difference in form and size is not a strong objection to this view ; for it is certainly not greater than between the mastiff and the greyhound, the water-spaniel and the lap- dog ; of the specific identity of which we entertain no doubts. In a state of nature, however, hybrids are seldom if ever produced in the animal kingdom, even among nearly allied species, and nature seems to abhor such intermix¬ tures. (T's-T’) HYDASPES, now the Jelum, one of the five rivers of the Punjab. See Punjab. H YDE, Edward (afterwards Earl of Clarendon), was born at Dinton, in the county of Wilts, on the 18th of February 1609. He was the third son of Henry Hyde, the descendant of a family of that name, which had resided from a remote period at Norbury, in Cheshire. Edward, after receiving his first education under his father’s roof, was sent, at the age of thirteen, to Magdalen Hall, at Oxford. He was originally intended for the church ; but, in consequence of the death of his last surviving elder brother, his destination was changed, whilst he was at the university, from the profession of the church to that of law, and in 1625 he was entered at the Middle Temple. A severe ague with which he was attacked that year caused a suspension of his studies, and temporary removal from the Middle Temple, to which he returned in 1626. In 1628, when riding the Norfolk summer circuit with his uncle, 64 H Y Hyde, Sir Nicholas Hyde, chief-justice of the King’s-Bench, who Edward, died in 1631, he caught the small-pox ; and his legal studies ^ were again for a long time interrupted. He married, in 1629, a daughter of Sir George Ayliffe, but she died of the small-pox six months afterwards. He married a second time in 1632, in which year he lost his father. His se¬ cond wife was a daughter of Sir Thomas Aylesbury, Bart., master of requests ; and by her he had several children. Hyde now applied himself to the study of the law with a diligence which he had not shown before, and his suc¬ cess soon surpassed the expectations of his contempora¬ ries. Meanwhile he lived little with lawyers; but he had many associates of political and literary celebrity—Lord Falkland, Selden, Chillingworth, Waller the poet, Ben Jonson, May the historian, Hales, Sheldon, Earles, and Morley. To these may be added a few men of high rank, as the Marquis of Hamilton, the Earls of Pembroke, Hol¬ land, and Manchester, and Lord Coventry. In 1635, through an accidental circumstance, he also obtained the notice of Archbishop Laud. In the course of an inquiry into the state of the customs instituted by the primate in his capacity of commissioner of the treasury, Hyde was mentioned to him as one who had been much consulted by some aggrieved merchants, and could afford the infor¬ mation desired. From this time Laud saw him frequently, employed him upon many occasions, and caused him to be noticed and employed by others. From 1635 till 1640 may be regarded as the most fortunate period of Hyde’s life. He was successful in his profession, possessed a com¬ petent private fortune, and was happily married. In 1640 he was elected member of parliament for Wootton-Basset and for Shaftesbury, and took his seat for the former. The parliament met on the 13th of April, and was dissolved on the 5th of May. Hyde’s first brief parliamentary career was characterized by activity and an honest zeal in the cor¬ rection of abuses, from which not all the friendship of Laud and the favour of the court was able to divert him. In his first speech he denounced the earl-marshal’s court, which, in its protection of the privileges of the titled classes, had been intolerably vexatious and oppressive ; and he showed himself a true and practical friend of rational free¬ dom. During this very short session, he served in seven committees. He foresaw the evil consequences of the hasty dissolution, and endeavoured in vain to prevail on Laud to employ his influence with the king to prevent it. In the next parliament, which met in November 1640, Hyde sat for Saltash. He recommenced his proceedings against the earl-marshal’s court, of which he procured the suppression. He was also chairman of a committee of in¬ quiry into the abuses of the Council of York, and the court of the Council of the Marches ; and he conducted the im¬ peachment of three of the barons of the exchequer for ille¬ gal exactions at the bidding of the crown. But Hyde, though zealous for the redress of grievances, was opposed to the encroachments of parliamentary authority, which began to assume a formidable aspect. Strongly attached to Episcopacy, he also disliked the attempts of the parlia¬ ment to remodel the government of the church ; and boasts that, as chairman of the committee on that question, he in¬ terposed so many delays that the project was suspended. He vehemently protested against the Commons’ remon¬ strance, his opposition to which was the occasion of his first introduction to Charles I. He had written an answer to it, which he showed in confidence to Lord Digby. Digby made it known to the king, who sent for Hyde, requested the paper, approved and published it as the reply of the king with the advice of his council. Soon afterwards the king offered to Hyde the office of solicitor-general, which the latter declined, alleging that he could better serve his sovereign in an unofficial capacity. To this the king as¬ sented ; and meanwhile committed to him, to Lord Falk- D E. land, and to Sir John Colepepper, the entire management Hyde, of his affairs in the House of Commons, assuring them that Hdward, he would take no step therein without their concurrence. Notwithstanding this assurance, Charles, without apprizing these chosen councillors, not long afterwards had recourse to the ill-timed measure of attempting to seize the five members in the House of Commons. Though the conse¬ quences of this rash act were irretrievable, and the royal cause was almost hopeless, Hyde continued courageously to support it. During many months he was secretly em¬ ployed in writing answers for the king to the declarations of the parliament, and had frequent interviews with him by stealth; but he was at length suspected, and narrowly escaped committal to the Tower by flying to the king at York. Though Hyde had thus become openly an adherent of the king, he long refused office. He declined the prof¬ fered post of secretary of state ; and it was not till March 1643 that, on the promotion of Sir John Colepepper to the mastership of the rolls, he accepted the chancellorship of the exchequer. He was one of the commissioners at the negotiations at Uxbridge, where, as on other occasions, he fruitlessly laboured to effect peace between king and parliament, as far as was compatible with a preservation of the royal prerogative and the rights of the established church. In 1644, after the battle of Naseby, Hyde was appointed, together with Sir John Colepepper and Lords Capel and Hopton, to form a council to attend, watch over, and direct the Prince of Wales. After hopelessly witnessing for many months a course of disastrous and ill-conducted warfare in the west, they fled with him, first to Scilly, and thence to Jersey; from which, at the entreaty of the queen, but against the opinion of Hyde and others of the council, the prince, in 1646, repaired to his mother at Paris, attended only by Sir John Colepepper, and leaving Hyde at Jersey. In this retreat Hyde remained till the spring of 1648, en¬ gaged in the composition of his History of the Rebellion, He also wrote, during this period, an answer to a declara¬ tion of the parliament, in which they charged the king with all the evils which had happened, and justified the discon¬ tinuance of all further addresses to him. In May 1648, he was summoned to attend the prince, who, at the head of a fleet which had espoused the royal cause, was blockading the Thames. Hyde, after encountering sundry difficulties, and amongst others seizure by privateers off" Ostend, did not meet the prince till his return to the Hague, about the end of August, from his fruitless expedition. Hyde found dissensions in the prince’s little court at the Hague, espe¬ cially between Prince Ilupert and Lord Colepepper. The news of the death of Charles I. for a while afflicted and appalled them ; but their animosities soon broke out afresh, and disturbed the councils of the new sovereign. In 1649, at the suggestion of Lord Cottington, Hyde and that noble¬ man were sent as ambassadors to the court of Spain for the purpose of soliciting its assistance. They were coolly re¬ ceived, and had the mortification of perceiving that the Spanish court was more inclined to cultivate the friendship of the commonwealth of England ; and to the memorial which they presented to the king of Spain in a private audience, they obtained only a cold and ambiguous reply. The treatment they experienced from the Spanish govern¬ ment was meanly time-serving, and varied with the fortune of Charles’s affairs. On his determining to proceed to Scot¬ land, upon the invitation of the Scotch council and parlia¬ ment, the ambassadors were treated with more regard. Upon the news of Cromwell’s victory over Argyll’s army, they were desired to depart. Accordingly, Hyde quitted Spain, unaccompanied by his colleague Lord Cottington, who chose to remain as a private person, though not permitted to reside at Madrid. On Hyde’s return from Spain in 1651, he met at Paris the king, returned from the ill-fated expedition HYDE. G5 Hyde, Edward. which terminated in his defeat at Worcester; which rash interference, and the king’s negotiation with the Scotch, and acceptance of the covenant, Hyde severely censured. He found himself exposed to the enmity of many, especially of the queen. Sundry calumnies were circulated against him, and two petitions were prepared—one from Presbyte¬ rians, the other from Papists—praying his removal from Charles’s councils. But Charles’s confidence in Hyde was not shaken by these intrigues ; and he appears to have seen their groundlessness, and properly appreciated the valuable services of so honest, able, and zealous a minister. Extreme poverty was amongst the evils which, in a greater or less degree, since Hyde’s departure from Jersey, he and his family had been compelled to bear. His family resided principally at Antwerp, and he and they were almost re¬ duced to want the most common necessaries of life; yet his courage and integrity never faltered, and he would not even (as many had done) compound for his estates in Eng¬ land, lest thereby he should seem to acknowledge the ex¬ isting government. Year after year, too, the hope of relief to the royalist party from foreign aid was waning away ; and neither foreign war nor domestic conspiracy seemed to avail against the power of Cromwell. In 1658 Cromwell died, but the protectorate passed, like an inheritance, into the hands of his son; and though the hopes of the royalists were naturally excited, the prospects of restoration were still found to be dark, vague, and distant. Hyde, who was now lord chancellor, corresponded much with those whom the weakness of Richard Cromwell and the distracted state of England had rendered favourable to the royal cause, and proved instrumental in forwarding that Restoration which was at length more ostensibly effected by the powerful agency of Monk. The period immediately following the Restoration was that of Hyde’s greatest power. He was the first minister, presiding over a cabinet in which the principal offices were filled by his friends (for such were Sir Edward Nicholas, the Earl of Southampton, and the Marquis of Ormonde), and the principal measures of the government were peculiarly his. The first great measure of his administration was the act of indemnity. This was in accordance with the king’s declaration from Breda, in which he promised pardon to all his subjects, save such as should be excepted by parlia¬ ment. by which was intended the exclusion of those who had been instrumental in his father’s death. Ihe lord chancellor was on the side of mercy, and urged the speedy adoption of this healing measure on a reluctant and vindic¬ tive parliament. In the settlement of property under the act of indemnity some apparent injustice was unavoidably committed, by the necessity of dealing differently, not ac¬ cording to the merits of persons, but the nature of the property to be dealt with, and the title by which it was held. Transactions between individuals could not be reached; but grants to or purchases by individuals from the usurping state became subject to revision from defect of title ; and crown and church lands were recovered from their holders, whilst the impoverished royalist who had sold his property to support the cause of the king was doomed to see the sale confirmed, and himself debarred from compensation. The royalists consequently murmured loudly. They called the statute an act of “ indemnity for the king’s enemies, and of oblivion for his friendsand they hated the chan¬ cellor for the part he took in framing this act, and his steady adherence to the principles of it. 1 he next important mea¬ sure was the settlement of the revenue. It is asserted by several authorities, that the chancellor might have obtained for the king from the parliament, in the first fervour of th^ir revived loyalty, an annual revenue of L,2,000,000. But it was not his wish to render the sovereign independent of the aid of his parliament, and he therefore sought for him only L.1,200,000, a sum scarcely sufficient for the exigen- VOL. XII. cies of the state, unless administered with due economy. Hyde, This sum the parliament readily granted. Military tenures, Edward, and the oppressive privileges of wardship, purveyance, and s v * pre-emption, were abolished, and the excise on liquors was granted in their stead. The restoration of the bishops to the House of Lords, the statute against tumultuous peti¬ tioning, the vesting of the supreme command of the militia solely in the crown, and the repeal of the triennial acts, were measures promoted by the chancellor for the purpose of strengthening the prerogative of the crown. In the regu¬ lation of the judicature he deserved high praise. He showed a rare impartiality and discernment in his appointments, and eminent integrity and diligence in the administration of his own office. His conduct in ecclesiastical matters was less liberal and judicious. He believed Episcopacy to be the only form of church government suitable to monarchy, and was too little tolerant towards other sects. Under his administra¬ tion several oppressive acts were passed ; the act of uni¬ formity, compelling clergymen, on pain of abandoning their livings, to subscribe to the forms of the Church of England, and to the doctrine of passive obedience, by which two thousand were ejected; the act against conventicles, im¬ posing fines on all present at any meeting for religious wor¬ ship at which five assisted besides the family; and the five- mile act, by which dissenting teachers who had not taken the oath of passive obedience were forbidden to approach within five miles of a place where they had preached since the act of indemnity. But the sin of such oppressions lay chiefly with the parliament. In that which succeeded the convention-parliament there were a great majority of high- churchmen. Venners’ insurrection had strengthened the prejudices against sectarians; and it is by no means certain that Clarendon could have stemmed the torrent of intoler¬ ance, even if he had wished or attempted to do so. In 1660, on the 3d of September, his daughter Anne was secretly married to the Duke of \ ork; an union which, after much opposition from the mother and sister of the duke, and the calumnies of profligate courtiers, was acknow¬ ledged about the end of the year. The discovery was re¬ ceived by the chancellor with violent demonstrations of in¬ dignation and grief. He seems to have been solicitous to repel the imputation of having secretly promoted an alliance so flattering to his ambition, and to have dreaded the efiects of the jealousy it might excite. He had in the following year a share in negotiating a marriage for the king with Catherine of Portugal; a marriage which, when it proved unfruitful, was groundlessly supposed to have been promo¬ ted by Clarendon under that expectation, and with a. view that his son-in-law or his descendants might inherit the throne. Such suppositions would have been far fetched, even if an incapacity in the princess to bear children had really existed ; and it must fall to the ground when the con¬ trary is known. Difference of religion was the only obvi¬ ous objection to this alliance; but there was no Protestant princess to whom Charles would ally himself ; and amongst Catholics the princess of Portugal was perhaps least objec¬ tionable, and conferred the advantages of a dowry of L.500,000, Tangiers, Bombay, and free trade with Portu¬ gal and its colonies. The profligacy of Charles, and the malign influence of Lady Castlemaine, afterwards Duchess of Geveland, which Clarendon vainly endeavoured to resist, were the main causes of the unhappiness of this marriage. Hyde showed no avidity for emoluments or distinctions. After the Restoration, when Monk was created a duke, and Montague an earl, Hyde declined a proffered peerage, rest¬ ing his refusal on unwillingness to excite disaffection amongst the new supporters of monarchy by an apparent eagerness on the part of the king to load with honours his old adher¬ ents. When the marriage of his daughter with the Duke of York became known, this objection ceased; a public mark of the king’s unaltered regard became desirable, and 66 HYDE. Hyde, Hyde accepted the barony of Hindoo. A further elevation Edward, took place in 1661, at the coronation, on the request of the ' Duke of York; and the chancellor was created Earl of Clarendon, and took his seat as such on the 11th of May. At the time when he was made a baron he accepted a pre¬ sent of L.20,000 from the king ; but he had declined at an earlier period the more valuable grant of ten thousand acres of crown land, which Charles was willing to bestow. One of the measures of his administration which has ex¬ posed him to most reproach, was the sale of Dunkirk in 1662. Yet it cannot be shown that the motive was cor¬ rupt, or the measure indefensible. Money was wanted ; large arrears had been due to the army ; and large sums had been necessarily expended in military and naval stores. The revenue settled by the parliament was insufficient in amount, and with difficulty collected; and subsidies were granted by the parliament in 1661 as an additional aid. The wants of the state were still urgent. Dunkirk was a source of expense to the yearly amount of L. 120,000. France was willing to purchase ; and after much negotia¬ tion between Clarendon and D’Estrades, Dunkirk was sold to France for 5,000,000 livres. A more truly censurable act of Clarendon’s administration was sanctioning the ac¬ ceptance of money for Charles from Louis XIV., though he had the honesty to refuse it for himself, and laying the foundation of that secret correspondence which at length rendered the king of England almost the pensioned servant of France. The sale of Dunkirk tended to weaken the po¬ pularity of Clarendon with the nation. He soon began to lose the favour of the king, by his opposition, in July 1663, to a measure Charles had much at heart, namely, a bill to invest the king with a discretionary power of dispensing, for a fine, penal laws against all sects, by which Charles hoped to favour the Catholics, though this purpose was ne¬ cessarily cloaked under a promise of toleration, including all Protestant dissenters. Clarendon, who knew and disap¬ proved of the motive, vehemently opposed this bill, and caused it to be laid aside ; and Charles from that time be¬ gan to entertain a dislike of his minister, which the ene¬ mies of Clarendon sedulously fostered. The Duke of Buck¬ ingham and other chosen associates of the king tried to undermine the influence of Clarendon by mimicry and taunts, representing him as a churlish pedagogue, and incit¬ ing the king to emancipate himself from restraint. His in¬ fluence as a minister was also lessened by the substitution of Bennet for his firm friend Sir Edward Nicholas, and by the reviving power of Coventry and Ashley. He also paid the penalty of power, in bearing the load of whatever cala¬ mities befel the nation. Even the plague, and the fire of London, and the disastrous issue of the Dutch war (a war to which the public was favourable, and he was adverse), concurred to weaken his popularity. The defenceless state of the Thames, which enabled the Dutch to invade it suc¬ cessfully, and the conclusion of a peace which the people disliked, were imputed to the chancellor. Anxious to pur¬ sue a middle course, and careless of the public favour, he had gained the friendship of no party alike able and willing to support him. The Protestant dissenters disliked him as the promoter of the measures against Nonconformists ; the Catholics as having frustrated the king’s endeavour to grant them indulgence ; the Royalists as the supporter of the act of indemnity and oblivion ; the populace because he had built a large house, which, it was already rumoured, was the ostentatious result of secret bribes from France or Holland. 1 he profligate and ambitious court disliked him as a re¬ prover of their license, and an obstacle to their advance¬ ment ; and Charles, who, aided by the high-church party, might have supported him against these assailants, had re¬ cently entertained a fresh ground of dislike. He knew that Clarendon opposed his infamous plan of obtaining a divorce ; and he believed him to have promoted the marriage of Miss Stewart, whom, after obtaining such divorce, Charles had intended to espouse. The discontented nation cla¬ moured for a victim ; and the ungrateful king was glad to sacrifice to popular vengeance the minister whose stub¬ born honesty was opposed to the gratification of his will. He sent a message to Clarendon, then in affliction from the recent death of his wife, advising him to resign, with a view of saving himself from impeachment. Clarendon refused to take so humiliating a step; and Charles deprived him of the Great Seal on the 13th of August 1667. Clarendon, whom the impeachment preferred by Lord Bristol four years before had left unshaken, was now again exposed to this attack under circumstances which rendered it more powerful against him. Urged by the dukes of Bucking¬ ham and Albemarle, the Commons drew up, on the 6th of November, an impeachment, consisting of seventeen arti¬ cles, which, after several days’ debate, was on the 12th carried up to the Lords. He was accused of designing to govern by a standing army, and advising the king to dis¬ continue parliaments; of saying that the king was in his heart a Papist; of receiving money for illegal patents ; of imprisoning in remote garrisons ; of unjust sale of offices ; of corruptly procuring the customs to be farmed at low rates ; of pretended debts to be paid by the king ; of receiv¬ ing sums from the vintners to afford them undue advantages; of procuring grants to be made to himself and his relations ; of introducing arbitrary government in the colonies; of frus¬ trating a proposal for the preservation of Nevis and St Chris¬ topher’s ; of advising and effecting the sale of Dunkirk ; of unduly causing the king’s letters-patent to Dr Croucher to be altered ; of arbitrary conduct in the council; of having caused quo warrantos to be issued against corporations, with the intent of extorting money; of having corruptly procured the bill of settlement for Ireland; of having de¬ ceived the king in his administration of foreign affairs, and betrayed his councils to the enemy; and of having coun¬ selled the division of the fleet in June 1666. To these flimsy charges Lord Clarendon replied by the mouth of his son, that if any one was proved, he would submit to the rest. His accusers were ashamed to make any one of them the specific ground of an impeachment; and accordingly he was impeached of high treason in general terms, and his imprisonment demanded, until the Commons, “ in conve¬ nient time,” shall exhibit “ articles against him.” The Lords refused to imprison him on this general accusation. Much controversy ensued between the two Houses, during which, in compliance with the entreaties of his friends, and the intimated wishes of the king, Clarendon closed the dis¬ pute by withdrawing himself from the kingdom on the 29th of November 1667, and retiring to France. He left on his departure a vindication of his conduct, addressed to the House of Lords, which address was communicated to the Commons, by whom it was voted that it was scandalous and seditious, and should be burned by the hangman. The Commons then attemped to obtain his attainder, but were opposed by the Lords; and the two Houses finally con¬ curred in an act of banishment and incapacity, unless he appeared and took his trial before the 1st of February, which act was passed on the 18th of December 1667. Fresh persecutions awaited Clarendon. The court of France, in order to gain the favour of England, wished to expel him from their dominions; and it was not till their hopes of alliance were dispelled by the triple league, that they showed kindness to the distinguished exile, and Clarendon received a special permission to reside in any part of France. He abode principally at Montpellier, where, resuming his lite¬ rary labours, he completed his celebrated History, and the Memoir of his own Life. From thence he repaired to Rouen, where, in the year 1674, he addressed to Charles II. a fruitless prayer for permission to spend the short re¬ mainder of his life in England. A few months afterwards Hyde, Edward. H Y D Hyde, he died at Rouen, on the 9th of December 1674, in the Thomas. sixty-fifth year of his age. Xhe character of Lord Clarendon has been much ex¬ posed to undeserved extremes of praise and of censure. He has been made the idol of the high-church party, and bitterly assailed by their opponents. As a minister he ap¬ pears to have been incorrupt, indefatigable, zealous for the public service, and anxious to hold an even balance between the liberties of the subject and the privileges of the crown, and to secure to the restored king only the constitutional powers of limited monarchy. His chief faults were harsh¬ ness towards the Nonconformists, and acquiescence in the king’s clandestine acceptance of pecuniary aid from France. His merits cannot be fairly estimated, without considering the difficulties of his position, the profligacy and corruption of the times in which he lived, to which he boldly and honourably opposed himself, and comparing his administra¬ tion with the disgraceful epoch by which it was succeeded. He was upright and uncompromising, and neglectful of the arts of popularity, both towards men of high and of humble station. His abilities were very great, but consisted per¬ haps rather in quickness than in depth and comprehensive¬ ness of mind. He was ready and powerful as an orator, and prompt and able in the despatch of business, of which, in spite of frequent illness, he bore by far the greatest share during the period of his administration. In private life he was unimpeachable. As a writer he will ever occupy a high place. His history, as characterized by a distinguished modern historian, is “ a monument of powerful ability and impressive eloquence.” Its remarkable beauties are its mas¬ terly delineation of celebrated characters, the occasional elo¬ quence of its descriptive passages, and the frequent inter- spersion of luminous reflections. Its chief faults are dif¬ fuseness of style, and the want of accuracy and arrangement. Its fidelity as a history cannot be upheld; a defect attribut¬ able partly to the circumstance of his having trusted much to recollection in the absence of requisite materials, partly to that desire to render it serviceable to the cause of the royalists, with which he professed to have commenced it. His principal works are, his History of the Rehellion ; A short View of the State of Ireland ; and The Life of Edward Earl of Cla¬ rendon, in which is included a Continuation of his History of the Grand Rebellion. Of these three works, a complete edition, con¬ taining the passages suppressed by former editors, was published for the first time at Oxford in 1826. Brief View and Survey of the Dangerous and Pernicious Errors to Church and State in Mr Hobbes’ Book entitled the Leviathan, Oxford, 1676; A Collection of Tracts, fol. London, 1727, containing—A Vindication of Himself; Reflec¬ tions on several Christian Duties, Divine and Moral, by way of Essays ; Contemplations and Reflections upon the Psalms of David ; A Dialogue of the Want of Respect due to Age; and a Dialogue concerning Education. (See Life of Clarendon, by himself, and his History of the Rebel¬ lion ; Clarendon’s State Papers ; Wood’s Athence Oxonienses ; White- locke’s Memorials ; Burnet’s History of his Own Times; Memoirs of James II.; Pepys’s Diary; Evelyn’s Diary ; Parliamentary His¬ tory ; State Trials; Life of Clarendon, by Thomas Henry Lister; and Macaulay’s History of England, &c. (t. H. L.) Hyde, Thomas, one of the most learned of English orien¬ talists, was born in 1636, at Billingsley, near Bridgenorth in Yorkshire. He inherited his taste for linguistic studies from his father, who was rector of that parish. At the age of sixteen he entered King’s College, Cambridge, and under Wheeloch, the famous professor of Arabic, made great and rapid progress in the Eastern tongues. After spending a year at that university, Hyde removed to London, where he was engaged to aid Walton in his edition of the Polyglot Bible. Besides correcting the Arabic, Syriac, and Persian texts, he transcribed in Persian characters the Persian trans¬ lation of the Pentateuch that had been printed in Hebrew shortly before at Constantinople, and appended a Latin ver¬ sion of his own. The success with which he accomplished these difficult tasks met the acknowledgments of the most H Y D 67 learned men of the age. In 1658 Hyde entered Queen’s Hyde College, Oxford, to which he was shortly after made He- !! brew reader. In the following year, after graduating as H*^®ra' M.A., he was chosen under-keeper, and finally librarian-in- t ^ a ^ t chief of the Bodleian library. In 1660 he was made a canon of Salisbury ; in 1678 archdeacon of Gloucester; and four years later took his degree of D.D. I he death of Pococke in 1691 opened up to him the Laud.an professorship of Ara¬ bic ; and soon after, on the deprivation of Altham, he be¬ came regius professor of Hebrew, and canon of Christ Church. Worn out by his unremitting labours, he resigned his librarianship in 1701, and died two years later, February 18, 1703. The range of Hyde’s erudition in Oriental matters was vast. There was hardly an Eastern tongue to be learned with which he was not familiar. He even knew Chinese— a language which very few Europeans of that day could hoast of knowing. He learned it from Chin-fo-coung, a learned young Chinese brought to this country by the Jesuits. His mastery of the more accessible languages of the East—such as Turkish, Arabic, Persian, Hebrew, Ar¬ menian, &c.—is proved by his numerous and still valuable works. The best of these is his Veterum Persarum et Magorum religionis Historia, in which, for the first time, an attempt is made to correct from Oriental authorities the errors of the Greek and Latin historians who have described the religion of the ancient Persians. Of his other works may be mentioned his Tabulce Long, ac Latit. Stellarum Fixarum ex observatione Ulugh Beighi, &c., to which Hyde has appended a learned commentary exhibiting the different names of the stars among the Orientals and the Greeks, and endeavouring to trace them to a common origin ; Qua- tuor Evangelia et Acta Apostolorum Lingud Malaicd carac- teribus Europceis, Oxford, 1677 ; Epistola de Mensuns et Ponderibus Serum sive tiinensium, appended to Bernard’s treatise De Mensuris et Ponderibus ; BeLudisOrientalibus, libri ii., Oxford, 1694. The whole of Hyde’s works, except that on the Religion of the Ancient Persians, were reprinted by Granville Sharp, under the title of Syntagma Disserta- tionum quas olim D. Thomas Hyde, separatim edidit, Ox¬ ford, 1767. In this edition, Sharp incorporated a number of other works of Hyde’s which had been left in MS. 1 he Hist. Relig. Vet. Pers. was not included in Sharp’s edition, as it had been republished shortly before by Hunt and Costard. HYDE, a manufacturing town of England, county of Chester, 7£ miles E.S.E. of Manchester. The town owes its importance to the cotton manufacture, which affords employment to nearly the whole population. There are extensive coal mines in the vicinity. Pop. (1851) 10,051. HYDER ALL See Hindustan. HYDERABAD, an extensive province of Hindustan, in the Deccan, which is situated principally between the 16th and 22d degrees of N. Lat. The name is now applied ge¬ nerally to all the territories of the Nizam. This territory composed a considerable portion of the ancient Telingana. The country is hilly, but not mountainous, being for the most part an elevated table-land, in consequence of which the climate is colder than might be expected from the lati¬ tude. In the vicinity of the city of Hyderabad, the mean temperature in the house, according to observations made at sunrise, at 2 o’clock in the afternoon, and at sunset, for one year, was—in January 74°, February 76°, March 84°, April 91°, May 93°, June 88°, July 81°, August 80 , September 79°, October 80°, November 76°, December 74°; giving as an annual mean, 81^°. The S.W. monsoon commences about the beginning of June, and terminates about the beginning of October. After it has ceased, vari¬ able weather continues for a few weeks, and this is followed by the N.E. monsoon. At midwinter the variation of tem¬ perature in the northern part of the territory is very great and sudden. The mornings are very cold, and ice is formed, 68 II Y D E K Hydera- but the days are hot. Numerous rivers intersect the terri- bad. tory, the principal of which are the Godavery, the Wurda, and the Kistna, with their numerous tributaries. I he country is consequently fertile, and, under proper manage¬ ment, would yield abundantly. But the whole territory is principally rented to powerful zemindars, or is granted in jaghires to the officers of government. This distribution of the landed property, which, with the exception of some portions set aside for charitable purposes, and the estates of the Nizam and the different branches of his family, is in the hands of a few individuals, is supposed to be injurious to agriculture, and of course to the interests of the revenue. The- cultivators are wretchedly poor, and are much op¬ pressed by their superiors the holders, who are subject to little or no restraint from their nominal sovereign. Where they are properly cultivated, the fields yield excellent crops of wheat, which is transported by the inland carriers to the sea-coast, whence salt is brought in return. At present, the principal trade carried on between the Nizam’s dominions and those under the British government, consists in the exportation of cotton to Berar and to the Northern Circars, and also to the markets at Vellore, Arnee, and the vicinity. They bring back salt and salted fish, cloths manufactured in the Northern Circars, Arnee muslins, and European manufactures; the latter principally for the supply of the British forces subsidized by the Nizam, and for clothing his army. The chief towns of this kingdom are Hyderabad, Golcondah, Warangole, Secunderabad, Beder, and Ellich- pore. The majority of the people are Hindus : but having been long the seat of a Mohammedan government, a con¬ siderable portion of the inhabitants are of that religion. The revenue of the Nizam is returned at L.1,150,000. In addi¬ tion to the subsidiary force maintained by the British go¬ vernment in Hyderabad, in accordance with the treaty of 1800, the Nizam has a large military force, consisting of cavalry, infantry, and artillery, besides a body of irregular troops, composed of Arabs, Scindees, Moguls, and Seiks. This country was formerly subject to the rajahs of Te- lingana and Bijanagur ; but being afterwards conquered by the Mohammedans, was formed into a separate kingdom in the year 1512, under the name of Golcondah, by Moham¬ med Kooly, originally a Turkish adventurer. In 1687, it was brought under the dominion of Aurungzebe, and was converted into one of the provinces of the Mogul empire, and, with the other five southern provinces, was formed into a viceroyalty, under an officer appointed by the court of Delhi, called the soobahdar of theDeccan. In 1719, a Mogul officer, Cheen Khilij Khan, being appointed to this govern¬ ment, with the title of Nizam al Moolk, or superintendent of the kingdom, collected a large army, and got possession of all the strongholds of the Deccan ; and setting up for independence, he overawed the emperor Mohammed Shah and his ministers. After the invasion of Nadir Shah in 1739, he left to the Mogul nothing but the name of sove¬ reign ; and he, having made Aurungabad his capital, died at Boorhanpore in the year 1748, aged 104 years. He was succeeded by his second son, who was assassinated in 1750, and succeeded by his nephew Muzuffer Jung, who was as¬ sassinated the following year, and succeeded by his cousin Salabut Jung. This weak prince was dethroned by his youngest brother Nizam Ali, who for nearly twenty years was engaged in wars with Hyder Ali, the British, and the Mahrattas, during which his territories were greatly con¬ tracted. In 1766, Nizam Ali concluded a treaty with the East India Company, under which they engaged to have a body of troops ready to settle the affairs of his highness’s government in everything that was right and proper. Sub¬ sequently Nizam Ali united his forces with those of Hyder Ali, but the alliance proving unprosperous, he concluded a new treaty with the East India Company in 1768. In the following year, on the breaking out of the war with Tippoo, A B A D. a treaty was concluded between the Nizam, the Peishwa, Hydera- and the British government. Tippoo purchased peace at had. the sacrifice of half his dominions, and the Nizam had no reason to be dissatisfied with his share of the spoil. At a later period the Nizam claimed the assistance of the Bri¬ tish government against the Mahrattas, which being refused, he sought safety in the entertainment of a body of French troops, who, however, were dismissed in accordance with the provisions of a treaty concluded in 1798. On the fall of Tippoo, and the annihilation of the state of Seringapa- tam, the Nizam participated largely in the division of the territory; and in 1800 he concluded a treaty offensive and defensive, by which he became a dependant and ally of the British. He agreed to receive into his territories a British force of 8000 infantry and 1000 cavalry; to relinquish to the British the management of all his foreign relations ; and, for the regular payment of the troops stationed in his coun¬ try, to cede certain portions of territory to tfie British. By a commercial treaty concluded in 1802 with the British, it was agreed, in lieu of all local duties, that a duty of five per cent, should be levied on all articles respectively imported into the territories of each. In 1804, after the conclusion of the war with Scindia and the rajah of Nagpoor, the Nizam acquired a large accession of territory. Nizam Ali died in 1803. He was succeeded by Secander Jab, who died in 1829. Under the successor of this prince the misgovern- ment of the country greatly increased, and the debt of the state was allowed to accumulate to an enormous extent, the British government being creditors for arrears amounting to half a million sterling. The claim was pressed on the notice of the Nizam’s government, and its settlement was at length effected by a territorial cession, the revenues of which were made applicable to the reduction of the debt and the main¬ tenance of the Nizam’s military contingent. The territory of the Nizam may be estimated at 420 miles in length by 220 miles in breadth, and contains 10,000,000 of inhabitants. Hyderabad, the capital of the above-mentioned province of Hyderabad, and of the Nizam’s dominions, is situated on the south side of the Musa River, which runs rapidly during the rains, but in the dry season has scarcely two feet of water. It is said to have been founded about the year 1586 by Sultan Mohammed Kootub Shah, who, thinking the air of Golcondah did not agree with his constitution, gave orders for building a new city, which continued to be the residence of the Kootub Shah dynasty till the year 1687, when it was taken by Aurungzebe. The late Nizam Ali Mas the first of the Nizams who made it his residence, and he spent considerable sums in improving it. It is now a large and populous place, about 7 miles in circumference, and is surrounded by a stone wall, with towers at the angles and gates, which, though incapable of defence against artillery, is a good protection against the incursions of cavalry. It contains two palaces and some elegant mosques, this having long been the seat of Mohammedanism in the Deccan ; and between it and Golcondah there are some handsome tombs. There is a considerable suburb on the opposite side of the river, and in this quarter is situate the British residency, the communication between it and the city and palace being maintained by a handsome stone bridge. The elevation of the town above the sea is 1800 feet. At present it is esti¬ mated to contain 200,000 inhabitants, including the suburbs. The travelling distance from Calcutta by the Northern Circars is 902 miles, by Nagpoor 1043 miles, from Madras 352, from Bombay 480, from Delhi 923, from Poonah 387, from Seringapatam 406. E. Long. 78° 32', N. Lat. 17° 22*. Hyderabad, a city of Hindustan, in the province of Scinde, of which it is the capital. The fortress of Hyderabad, which, previously to the annexation of the country to the British empire, was appropriated solely to the residence of the princes and their families, is situated on a rock the foot of which is washed by a branch of the River Indus, here Hydera¬ bad. H Y D named the Fulalee. It is of an irregular pentagonal figure, suited to the natural form of the rock, and is defended by round towers, and a high brick wall perforated with loop¬ holes. The situation is remarkably strong; the sides of the hill being in many places so steep as to render the accent to the fortress difficult, even though a breach were made in the walls. The weakest point is towards the south¬ east, opposite a break in the rock from the Fulalee. A diy ditch twelve feet broad protects the northern side. The po¬ sition is good, and the fortifications adequate to resist any attack of native troops. Hyderabad is situated 130 miles from the sea, on the eastern side of the main stream of the Indus, with which it is connected by the Fulalee at the dis¬ tance of 3 miles. Sir Charles Napier entered the place on the 20th February 1843, having previously received the submission of six of the ameers of Scinde. On the 24th he marched out to give battle to Sheer Mohammed, of Meerpore, who yet remained in arms, and was posted in gieat ibrce behind a neighbouring watercourse, which had been parti¬ ally fortified. The ameer was, however, attacked and de¬ feated, the British force being thus enabled to march upon Meerpore. The country around Hyderabad rises into hills, although it is level till within a few miles of that city. The Indus ^is a perpetual source of fertility, affording an inex¬ haustible supplv of water for the irrigation of the fields. The flat country of Scinde is intersected by branches from the main stream, and by canals ; and the transition fiom the H Y D 69 Hydr parched deserts of Cutch to such a scene of fertility is de¬ scribed by Dr Burnes as affording a very striking contrast. ^ The Fulalee in the month of August is from two and a ha |icg to three fathoms deep at Hyderabad, and is covered wit i boats laden with heavy goods. The population is 24,000. ^ E. Long. 68. 28., N. Lat. 25. 22. u A , . . HYDRA, a rocky island in the Grecian Archipelago, 6 miles off the coast of Argolis. It is 12 miles in length, from N.N.E. to S.S.W., by 3 in breadth. The surface presents scarcely a speck of vegetation, and the inhabitants are entirely dependent on trade and commerce. ts in sular position and facilities for trade pointed it out as a suitable place of refuge from the oppression of the lujks. At the commencement of the war of independence it hat no fewer than 150 vessels, while the bravery of the people, and their efficiency as seamen, contributed in no small de- oree to the successful issue of that contest. 1 he town o Hydra, which, with the exception of two adjacent villages, is the only inhabited part of the island, is situated on the N.W. side, and rises abruptly from the harbour in succes¬ sive tiers in the form of an amphitheatre. 1 he harbour is a deep bay, neither spacious nor secure. In 1825 the po¬ pulation of the island was estimated at 40,000 ; but at pre¬ sent it does not amount to more than half that number. HYDRAOTES, in Sanscrit, Irayati, modified into the present appellation the Ravee, one of the five rivers of the Punjab. See Punjab. HYDRODYNAMICS. Definition. 1. TTYDRODYNAMICS, from 0»e, “ water,” and 11 hwun, “ power,” is properly that science which treats of the power of water, whether it acts by pressure or by impulse. In its more enlarged acceptation, how¬ ever, it treats of the pressure, equilibrium, cohesion, and motion of fluids, and of the machines by w ncn wa er is raised, or in which that fluid is employed as the first mover. Hydrodynamics is divided into two branches, Hydrostatics and Hydraulics. Hydrostatics comprehends the pressure, equilibrium, and cohesion of fluids, and Hy¬ draulics their motion, together with the machines in which they are chiefly concerned. HISTORY. Hvdrody- 2. The science of hydrodynamics was cultivated with namics in less success among the ancients than any ot icr ranc i o some re- mechanical philosophy. When the human mind had made spects a cons;derable progress in the other departments ot physical n,odern science, the doctrine of fluids had not begun to occupy the SC‘enLe' attention of philosophers ; and, if we except a few proposi¬ tions on the pressure and equilibrium of water, hydrodyna¬ mics must be regarded as a modern science, which owes its existence and improvement to those great men who adornet the seventeenth and eighteenth centuries. Discoveries 3. Those general principles of hydrostatics which are to of Archi- tins day employed as the foundation of that part ot the^ medes . science were first given by Archimedes in his_ work Hcpi A. C. 250. > or j)e Insidentibus Humido, about 2o0 years be¬ fore the birth of Christ, and were afterwards applied to ex¬ periments by Marinus Ghetaldus in his Archimedes Ho- motus. Archimedes maintained that each particle of a fluid mass, when in equilibrio, is equally pressed in every direction ; and he inquired into the conditions, according to which a solid body floating in a fluid should assume and preserve a position of equilibrium. We are also in¬ debted to the philosopher of Syracuse for that ingenious hydrostatic process by which the purity of the precious metals can be ascertained, and for the screw engine which goes by his name, the theory of which has lately exer¬ cised the ingenuity of some of our greatest mathemati- cians. , 4. In the Greek school at Alexandria which flourished under the auspices of the Ptolemies, the first attempts were made at the construction of hydraulic machinery. About 120 years after the birth of Christ, the fountain of Inventions compression, the syphon, and the forcing pump, were in-ofCtesibius vented by Ctesibius and Hero ; and though these machines operated by the elasticity and weight of the air, yet their inventors had no distinct notions of these preliminary branches of pneumatical science. 4 he syphon is a simple, instrument which is employed to empty vessels full of water or spirituous liquors, and is of great utility in the arts. The forcing pump, on the contrary, is a complicated Forcing and abstruse invention, which could scarcely have been1 umP* expected in the infancy of hydraulics. It was probably suggested to Ctesibius by the Egyptian wheel or Noria, Egyptian which was common at that time, and which was a kind of wheel- chain pump, consisting of a number of earthern pots car¬ ried round by a wheel. In some of these machines the pots have a valve in their bottom which enables them to descend without much resistance, and diminishes greatly the load upon the wheel; and if we suppose that this valve was introduced so early as the time of Ctesibius, it is not difficult to perceive how such a machine might have led this philosopher to the invention of the forcing pump. , 5. Notwithstanding these inventions of the Alexandrian Labours ot school, its attention does not seem to have been directed Sextus Ju- to the motion of fluids. The first attempt to investigate nus in hy_ this subject was made by Sextus Julius Frontinus, inspec- ^j-auiics. tor of the public fountains at Rome in the reigns of NervaA. D. 110. and Trajan ; and we may justly suppose that his work en¬ titled De Aquceductibus urbis Rornce Commentarius con¬ tains all the hydraulic knowledge of the ancients. Alter 70 II Y D R O I) Y N A MI C S. History. The Ro¬ mans ac¬ quainted with the art of con¬ ducting water in pipes. Labours of Galileo. Rnrn 15G4, died IG41. describing the ninex great Roman aqueducts, to which he himself added Jive more, and mentioning the date0, ot their erection, he considers the methods which were at that time employed for ascertaining the quantity of water discharged from adjutages, and the mode of distributing the waters of an aqueduct or a fountain. He justly remarks that the expense of water from an orifice, depended not only on the magnitude of the orifice itself, but also on the height of the water in the reservoir ; and that a pipe employed to carry off a portion of water from an aqueduct, should, as circumstances required, have a position more or less in¬ clined to the original direction of the current. But as he was unacquainted with the true law of the velocities of running water as depending upon the depth of the orifice, wre can scarcely be surprised at the want of precision which appears in his results. It has generally been supposed that the Romans were ignorant of the art of conducting and raising water by means of pipes ; but it can scarcely be doubted, from the statement of Pliny and other authors, that they not only were acquainted with the hydrostatical principle, but that they actually used leaden pipes for the purpose. Pliny asserts that water will always rise to the height of its source, and he also adds that, in order to raise water up to an emi¬ nence, leaden pipes must be employed.2 6. The labours of the ancients in the science of hydro¬ dynamics terminated with the life of Frontinus. The sciences had already begun to decline, and that night of ignorance and barbarism was advancing apace, which for more than a thousand years brooded over the nations of Europe. During this lengthened period of mental dege¬ neracy, when less abstruse studies ceased to attract the no¬ tice, and rouse the energies of men, the human mind could not be supposed capable of that vigorous exertion, and patient industry, which are so indispensable in physical re¬ searches. Poetry and the fine arts, accordingly, had made considerable progress under the patronage of the family of Medici, before Galileo began to extend the boundaries of science. This great man, who deserves to be called the father and restorer of physics, does not appear to have di¬ rected his attention to the doctrine of fluids : but his dis¬ covery of the uniform acceleration of gravity, laid the foun¬ dation of its future progress, and contributed in no small degree to aid the exertions of genius in several branches of OfCastelli. 7- Castelli and Torricelli, two of the disciples of Galileo, Rorn 1577, applied the discoveries of their master to the science of died 1644. hydrodynamics. In 1628 Castelli published a small work, Della Misura dell ’acque correnti, in w hich he gave a very satisfactory explanation of several phenomena in the motion of fluids, in rivers and canals. But he committed a great paralogism in supposing the velocity of the water propor¬ tional to the depth of the orifice below the surface of the vessel. Torricelli observing that in a jet d’eau where the water rushed through a small adjutage, it rose to nearly died1! 64 7^ ^ same with the reservoir from which it was sup- 16 '* plied, imagined that it ought to move with the same velo¬ city as if it had fallen through that height by the force of gravity. And hence he deduced this beautiful and im¬ portant proposition, that the velocities of fluids are as the square roots of the pressures, abstracting from the resist¬ ance of the air and the friction of the orifice. This theo¬ rem was published in 1643, at the end of his treatise De Motu Gravium naturaliter accelerato. It was aftenvards confirmed by the experiments of Raphael Magiotti, on Of Torri¬ celli. the quantities of water discharged from different adjutages History under different pressures ; and though it is true only in small orifices, it gave a newr turn to the science of hydraulics. 8. After the death of the celebrated Pascal, who dis-Of Pascal, covered the pressure of the atmosphere, a treatise on the Rorn 1623, equilibrium of fluids (Sur VEqailibre des Liqueurs), was ^1C(i lct>2. found among his manuscripts, and was given to the public in 1663. In the hands of Pascal, hydrostatics assumed the dignity of a science. The laws of the equilibrium of fluids were demonstrated in the most perspicuous and sim¬ ple manner, and amply confirmed by experiments. Tht discovery of Torricelli, it may be supposed, would have incited Pascal to the study of hydraulics. But as he has not treated this subject in the work which has been men¬ tioned, it was probably composed before that discovery had been made public. 9. The theorem of Torricelli was employed by manyofMari- succeeding writers, but particularly by the celebrated Ma-otte. riotte, whose labours in this department of physics deserve Died lc84* to be recorded. His Traite du Mouvement des Eaux, which was published after his death in the year 1686, is founded on a great variety of well-conducted experiments on the motion of fluids, performed at Versailles and Chantilly. In the discussion of some points he has committed considerable mistakes. Others he has treated very superficially, and in none of his experiments does he seem to have attended to the diminution of efflux arising from the contraction of the fluid vein, when the orifice is merely a perforation in a thin plate ; but he appears to have been the first who attempted to ascribe the discrepancy between theory and experiment to the retardation of the water’s velocity arising from fric¬ tion. His cotemporary Guglielmini, who was inspector of the rivers and canals in the Milanese, had ascribed this di¬ minution of velocity in rivers, to transverse motions arising from inequalities in their bottom. But as Mariotte ob¬ served similar obstructions even in glass pipes, where no transverse currents could exist, the cause assigned by Guglielmini seemed destitute of foundation. The French philosopher, therefore, regarded these obstructions as the effects of friction. He supposes that the filaments of water which graze along the sides of the pipe lose a portion of their velocity; that the contiguous filaments having on this account a greater velocity, rub upon the former, and suft'er a diminution of their celerity ; and that the other filaments are affected with similar retardations proportional to their distance from the axis of the pipe. In this way the medium velocity of the current may be diminished, and consequent¬ ly the quantity of water discharged in a given time, must, from the effects of friction, be considerably less than that which is computed from theory. 10. That part of the science of hydrodynamics which The mo- relates to the motion of rivers seems to have originated intion of Italy. This fertile country receives from the Apennines r'vers a great number of torrents, which traverse several princi- palities before they mingle their waters with those of the Po, into which the greater part of them fall. To defend themselves from the inundations with which they were threatened, it became necessary for the inhabitants to change the course of their rivers ; and while they thus drove them from their own territories, they let them loose on those of their neighbours. Hence arose the continual quarrels which once raged between the Bolognese and the inhabitants of Modena and Ferrara. The attention of the Italian engineers was necessarily directed to this branch of science; and from this cause a greater number of works 1 These nine aqueducts delivered every day 14,000 quinaria, or about 50,000,000 cubic feet of water, or about 50 cubic feet for the daily consumption of each inhabitant, supposing the population of Rome to have been a million. According to Professor Leslie, the supply in modern Rome is forty cubic feet per person, in London three cubic feet, and in Paris one-half a cubic foot. See Elements of Nat. Phil, p, 419. 2 Phn. xxxvL 7- See also Palladius De lie Rustica ix. 11, &c., and Horace Epist. I. x. 20, Ovid Met. iv. 120. HYDRO DYN AM IC S. 71 Theory of Gugliel- mini. Discove- History. were written on the subject in Italy than in all the rest of Europe. 11. Guglielmini was the first who attended to the mo¬ tion of water in rivers and open canals.1 Embracing the theorem of Torricelli, which had been confirmed by repeated experiments, Guglielmini concluded that each particle in the perpendicular section of a current has a tendency to move with the same velocity as if it issued from an orifice at the same depth from the surface. The consequences deducible from this theory of running waters are in every respect repugnant to experience, and it is really surprising that it should have been so hastily adopted by succeed¬ ing writers. Guglielmini himself was sufficiently sensible that his parabolic theory was contrary to fact, and endea¬ voured to reconcile them by supposing the motion of rivers to be obstructed by transverse currents arising from irregu¬ larities in their bed. The solution of this difficulty, as given by Mariotte, was more satisfactory, and was after¬ wards adopted by Guglielmini, who maintained also that the viscidity of water had a considerable share in retarding its motion. 12. The effects of friction and viscidity in diminishing ries of Sir the velocity of running water were noticed in the Principia Isaac New-0f gir Isaac Newton, who has thrown much light upon seve- 1‘)I1' ral branches of hydrodynamics. At a time when the Car- diedAT^. tesian system of vortices universally prevailed, this great ’ man found it necessary to investigate that absurd hypo¬ thesis, and in the course of his investigations he has shewn that the velocity of any stratum of the vortex is an arith¬ metical mean between the velocities of the strata which enclosed it; and from this it evidently follows, that the velocity of a filament of water moving in a pipe is an arith¬ metical mean between the velocities of the filaments which surround it. Taking advantage of these results, it was afterwards shewn by M. Pitot, that the retardations arising from friction are inversely as the diameters of the pipes in which the fluid moves. The attention of Newton was also directed to the discharge of water from orifices in the bot¬ tom of vessels. He supposed a cylindrical vessel full of water to be perforated in its bottom with a small hole by which the water escaped, and the vessel to be supplied with water in such a manner that it always remained full at the same height. He then supposed this cylindrical column of water to be divided into two parts ; the first, which he calls the cataract, being a hyperboloid generated by the revolu¬ tion of a hyperbola of the fifth degree around the axis of the cylinder which should pass through the orifice ; and the second the remainder of the water in the cylindrical vessel. He considered the horizontal strata of this hyperboloid as always in motion, while the remainder of the water was in a state of rest; and imagined that there was a kind of ca¬ taract in the middle of the fluid. When the results of this theory were compared with the quantity of water actually discharged, Newton concluded that the velocity with which the water issued from the orifice was equal to that which a falling body would receive by descending through half the height of water in the reservoir. This conclusion, how¬ ever, is absolutely irreconcilable with the known fact, that jets of water rise nearly to the same height as their reser¬ voirs, and Newton seems to have been aware of this objec¬ tion. In the second edition of his Principia, accordingly, which appeared in 1714, Sir Isaac has reconsidered his theory. He had discovered a contraction in the vein of fluid (vena contracta), which issued from the orifice, and found that, at the distance of about a diameter of the aper¬ ture, the section of the vein was contracted in the sub¬ duplicate ratio of two to one. He regarded, therefore, the section of the contracted vein as the true orifice from which the discharge of water ought to be deduced, and the velo¬ city of the effluent water as due to the whole height of History. water in the reservoir; and by this means his theory be- ^ v ' came more conformable to the results of experience. I his theory, however, is still liable to serious objections. I he formation of a cataract is by no means agreeable to the laws of hydrostatics; for when a vessel is emptied by the efflux of water through an orifice in its bottom, all the par¬ ticles of the fluid direct themselves toward this orifice, ami therefore no part of it can be considered as in a state ot repose. 13. The subject of the oscillation of waves, one of the The oscil- most difficult in the science of hydrodynamics, was first lation of investigated by Sir Isaac Newton. In the forty-fourth pro- position of the second book of his Principia, he has furnished ^ j^ew- us with a method of ascertaining the velocity of the waves ofton- the sea, by observing the time in which they rise and fall. If the two vertical branches of a syphon, which communi¬ cate by means of a horizontal branch, be filled with a fluid of known density, the two fluid columns, when in a state of rest, will be in equihbrio and their surfaces horizontal. But if the one column is raised above the level of the other, and left to itself, it will descend below that level, and raise the other column above it, and, after a few oscillations, they will return to a state of repose. Newton occupied himself in determining the duration of these oscillations, or the length of a pendulum isochronous to their duration ; and he found, by a simple process of reasoning, that, ab¬ stracting from the effects of friction, the length of a syn¬ chronous pendulum is equal to one-half of the length of the syphon, that is, of the two vertical branches and the hori¬ zontal one, and hence he deduced the isochronism of these oscillations. From this Newton concluded, that the velo¬ city of waves formed on the surface of water, either by the wind or by means of a stone, was in the subduplicate ratio of their size. When their velocity, therefore, is measured, which can be easily done, the size of the waves will be de¬ termined by taking a pendulum which oscillates in the time that a wave takes to rise and fall. 14. In the year 1718, the Marquis Poleni published, Labours oi at Padua, his work De Castellis per qua; derivantur Flu- the Mar- viorum aqua;, &c. He found, from a great number of * °' experiments, that if A be the aperture of the orifice, and D its depth below the surface of the reservoir, the^ie(j quantity of water discharged in a given time will be as 2 AD X while it ought to be as 2 AD, if the velo¬ city of the issuing fluid was equal to that acquired by fall¬ ing through D. By adapting to a circular orifice through which the water escaped, a cylindrical tube of the same diameter, the Marquis found that the quantity discharged in a determinate time was considerably greater than when it issued from the circular orifice itself; and this happened whether the water descended perpendicularly or issued in a horizontal direction. 15. Such was the state of hydrodynamics in 1738, when Daniel Daniel Bernouilli published his Hydrodynamica, seu efew-Bernouil- ribus et motibus Fluidorum Commentarii. His theory of^J^™™ the motion of fluids was founded on two suppositions, which ”ion1of 10' appeared to him conformable to experience. He supposed ^ui(js that the surface of a fluid, contained in a vessel which was Born 1700. emptying itself by an orifice, remains always horizontal; Died 1702. and if the fluid mass is conceived to be divided into an in¬ finite number of horizontal strata of the same bulk, that these strata remain contiguous to each other, and that all their points descend vertically, with velocities inversely pro¬ portional to their breadth, or to the horizontal sections of the reservoir. In order to determine the motion of each stratum, he employed the principle of the conservatio viri- 1 See his principal work, entitled La Misura dell' acque correnti. 72 HYDRODYNAMICS. History, um vivarum, and obtained very elegant solutions. In the opinion of the Abbe Bossut, his work was one of the finest productions of mathematical genius.1 Objected 16. The uncertainty of the principle employed by Daniel toby Mac-Bernouilli, which has never been demonstrated in a gene- laurin, raj manner> deprived his results of that confidence which diednifi” tnev would otherwise have deserved ; and rendered it de- and John’” sirable to have a theory more certain, and depending solely Bernouilli, on the fundamental laws of mechanics. Maclaurin and Born 1667, John Bernouilli, who were of this opinion, resolved the died 1748. problem by more direct methods, the one in his Fluxions, published in 1742; and the other in his Hydraulica nunc primum detecta, et directe demonstrata ex principiis pure mechanicis, which forms the fourth volume of his works. The method employed by Maclaurin has been thought not sufficiently rigorous ; and that of John Bernouilli is, in the opinion of La Grange, defective in perspicuity and precision. 17. The theory of Daniel Bernouilli was opposed also D’Alem- by the celebrated D’Alembert. When generalising James bert ap- Bernouilli’s Theory of Pendulums, he discovered a prin- plies his cjp]e 0f dynamics so simple and general, that it reduced the oFdvna ^aws moti°ns of bodies to that of their equilibrium, mics to the He applied this principle to the motion of fluids, and gave motion of a specimen of its application at the end of his Dynamics fluids, in 1743. It was more fully developed in his Traite des Born 1717. Fluides, which was published in 1744, where he has re¬ solved, in the most simple and elegant manner, all the pro¬ blems which relate to the equilibrium and motion of fluids. Fie makes use of the very same suppositions as Daniel Ber¬ nouilli, though his calculus is established in a very different manner. He considers, at every instant, the actual motion of a stratum, as composed of a motion which it had in the preceding instant, and of a motion which it has lost. The laws of equilibrium between the motions lost, furnish him with equations which represent the motion of the fluid. Al¬ though the science of hydrodynamics had then made con¬ siderable progress, yet it was chiefly founded on hypothe¬ sis. It remained a desideratum to express by equations the motion of a particle of the fluid in any assigned direc¬ tion. These equations were found by D’Alembert, from two principles, that a rectangular canal, taken in a mass of fluid in equilibrio, is itself in equilibrio ; and that a portion of the fluid, in passing from one place to another, preserves the same volume when the fluid is incompressible, or dilates itself according to a given law when the fluid is elastic. His very ingenious method was published in 1752, in his Essai sur la resistance des jluides. It was brought to perfection in his Opuscules Mathematiques, and has been adopted by the celebrated Euler. Before the time of D’Alembert, it was the great object of philosophers to submit the motion of fluids to general formulae, independent of all hypothesis. Their attempts, however, were altogether fruitless ; for the method of flux¬ ions, which produced such important changes in the phy¬ sical sciences, was but a feeble auxiliary in the science of hydraulics. For the resolution of the questions concerning the motion of fluids, we are indebted to the method of par¬ tial differences, a new calculus, with which Euler enriched the sciences. This great discovery was first applied to the motion of water by the celebrated D’Alembert, and enabled both him and Euler to represent the theory of fluids in formulae restricted by no particular hypothesis. Experi- 18. An immense number of experiments on the motion ments of 0f water in pipes and canals was made by Professor Miche- lottf16" lotti °f Turin’ at the expense of the sovereign. In these A D. 1704.experiments the water issued from holes of different sizes, under pressures of from 5 to 22 feet, from a tower con¬ structed of the finest masonry. Basins (one of which was History. 289 feet square) built of masonry, and lined with stucco, received the effluent water, which was conveyed in canals of brickwork, lined with stucco, of various forms and decli¬ vities. The whole of Michelotti’s experiments were con¬ ducted with the utmost accuracy ; and his results, which are in every respect entitled to our confidence, were pub¬ lished in 1774 in his Sperienze Idrauliche. 19. The experiments of the Abbe Bossut, whose labours Of the in this department of science have been very assiduous and Abbe Bos- successful, have, in as far as they coincide, afforded thesut- same results as those of Michelotti. Though performed on a smaller scale, they are equally entitled to our confidence, and have the merit of being made in cases which are most likely to occur in practice. In order to determine what were the motions of the fluid particles in the interior of a vessel emptying itself by an orifice, M. Bossut employed a glass cylinder, to the bottom of which different adjutages were fitted; and he found that all the particles descend at first vertically, but that at a certain distance from the ori¬ fice they turn from their first direction towards the aper¬ ture. In consequence of these oblique motions, the fluid vein forms a kind of truncated conoid, whose greatest base is the orifice itself, having its altitude equal to the radius of the orifice, and its bases in the ratio of 3 to 2.—It ap¬ pears also, from the experiments of Bossut, that when wa¬ ter issues through an orifice made in a thin plate, the ex¬ pense of water, as deduced from theory, is to the real ex¬ pense as 16 to 10, or as 8 to 5 ; and, when the fluid issues through an additional tube, two or three inches long, and follows the sides* of the tube, as 16 to 13 In analyzing the effects of friction, he found, 1. That small orifices gave less water in proportion than great ones, on account of fric¬ tion ; and, 2. That when the height of the reservoir was augmented, the contraction of the fluid vein was also in¬ creased, and the expense of water diminished; and by means of these two laws he was enabled to determine the quantity of water discharged, with all the precision he could wish. In his experiments on the motion of water in canals and tubes, he found that there was a sensible difference be¬ tween the motion of water in the former and in the latter. Under the same height of reservoir, the same quantity of water always flows in a canal, whatever be its length and declivity; whereas, in a tube, a difference in length and declivity has a very considerable influence on the quantity of water discharged. According to the theory of the re¬ sistance of fluids, the impulse upon a plane surface is as the product of its area multiplied by the square of the fluid’s velocity, and the square of the sine of the angle of incidence. The experiments of Bossut, made in conjunc¬ tion with D’Alembert and Condorcet, prove, that this is sensibly true when the impulse is perpendicular ; but that the aberrations from theory increase with the angle of im¬ pulsion. They found, that when the angle of impulsion wras between 50° and 90°, the ordinary theory may be em¬ ployed, that the resistances thus found will be a little less than they ought to be, and the more so as the angles recede from 90°. The attention of Bossut was directed to a va¬ riety of other interesting points, which we cannot stop to notice, but for which we must refer the reader to the works of that ingenious author. 20. The oscillation of waves, which was first discussed Inquiries by Sir Isaac Newton, and afterwards by D’Alembert, in °f Flauger- the article Ondes in the French Encyclopaedia, was now Sues. con‘ revived by M. Flaugergues, who attempted to overthrowtheosal- the opinions of these philosophers. He maintained, that a iati0n of vrave is not the effect of a motion in the particles of water, waves. * The germ of Daniel Bernouilli’s theory was first published in his memoir entitled Theoria Nova de Motu Aquarumper Canales quocunque Fluentes, which he had communicated to the Academy of St Petersburg as early as 1726. HYDRODYNAMICS. 73 History, by which they rise and fall alternately, in a serpentine line, vy wlien moving from the centre where they commenced; but that it is a kind of intumescence, formed by a depression at the place where the impulse is first made, which propa¬ gates itself in a circular manner when removing from the point of impulse. A portion of the water, thus elevated, he imagines, flows from all sides into the hollow formed at the centre of impulse, so that the water being, as it were, heaped up, produces another intumescence, which propa¬ gates itself as formerly. From this theory M. Flaugergues concludes, and he has’ confirmed the conclusion by experi¬ ment, that all waves, whether great or small, have the same velocity. And of M. 21. This difficult subject has also been discussed by M. Lagrange. Lagrange, in his Mecanique Analytique. He found Born 1730, j}ie velocity of waves in a canal, is equal to that which died 1813. & heavy bo(]y wouid acquire by falling through a height equal to half the depth of the water in the canal. If this depth, therefore, be one foot, the velocity of the waves will be 5-945 feet in a second; and if the depth is greater or less than this, their velocity will vary in the subduplicate ratio of the depth, provided it is not very considerable. If we suppose that, in the formation of waves, the water is agitated but to a very small depth, the theory of Lagrange may be employed, whatever be the depth of the water and the figure of its bottom. This supposition, which is very plausible, when we consider the tenacity and adhesion of the particles of water, has also been confirmed by experi¬ ence. Expert- 22. The most successful labourer in the science of hydro- ments and dynamics was the Chevalier Dubuat, engineer in ordinary to theory of the King of France. Following in the steps of the Abbe the Cheva- Lossut, he prosecuted the inquiries of that philosopher with Dubuat uncommon ingenuity ; and in the year 1786 he published, l7U79Ua ’ in two volumes, his Principes d'Hydrahque,1 which con¬ tains a satisfactory theory of the motion of fluids, founded solely upon experiments. The Chevalier Dubuat consi¬ dered that if water were a perfect fluid, and the channels in which it flowed infinitely smooth, its motion would be continually accelerated, like that of bodies descending in an inclined plane. But as the motion of rivers is not con¬ tinually accelerated, and soon arrives at a state of unifor¬ mity, it is evident that the viscidity of the water, and the friction of the channel in which it descends, must equal the accelerating force. M. Dubuat, therefore, assumes it as a proposition of fundamental importance, that when water flows in any channel or bed, the accelerating force, which obliges it to move, is equal to the sum of all the resistances which it meets with, whether they arise from its own vis¬ cidity or from the friction of its bed. This principle was employed by M. Dubuat, in the first edition of his work, which appeared in 1779; but the theory contained in that edition was founded on the experiments of others. He soon saw, however, that a theory so new, and leading to results so different from the ordinary theory, should be founded on new experiments more direct than the former, and he was employed in the performance of these from 1780 to 1783. The experiments of Bossut having been made only on pipes of a moderate declivity, M. Dubuat found it necessary to supply this defect. He used declivities of every kind, from the smallest to the greatest; and made his experiments upon channels, from a line and a hall in diameter, to seven or eight square toises. Researches 23. M. Venturi, Professor of Natural Philosophy in the of M. Ven-University of Modena, succeeded in bringing to light some tori, 1798. curious facts respecting the motion of water, in his work on the Lateral Communication of Motion in Fluids. He observed, that if a current of water is introduced with a certain velocity into a vessel filled with the same fluid at History, rest, and if this current, passing through a portion of the v v J fluid, is received in a curvilineal channel, the bottom of which gradually rises till it passes over the rim of the ves¬ sel itseltj it will carry along with it the fluid contained in the vessel; so that after a short time has elapsed, there re¬ mains only the portion of the fluid which was originally below the aperture at which the current entered. 1 his phenomenon has been called by Venturi, the lateral com¬ munication of motion in fluids; and, by its assistance, he has endeavoured to explain many important facts in hy¬ draulics. He has not attempted to explain this principle ; but has shown that the mutual action of the fluid particles does not afford a satisfactory explanation of it. The work of Venturi contains many other interesting discussions, which are worthy of the attention of every reader. 24. Although the Chevalier Dubuat had shown much sa- Discover- gacity in classifying the different kinds of resistances which 168 are exhibited in the motion of fluids, yet it was reserved forlom ’ Coulomb to express the sum of them by a rational function of the velocity. By a series of interesting experiments on the successive diminution of the oscillation of disks, arising from the resistance of the water in which they oscillated, he was led to the conclusion, that the pressure sustained by the moving disk is represented by two terms, one of which varies with the simple velocity, and the other with its square. When the motions are very slow, the part of the resistance proportional to the square of the velocity is insensible, and hence the resistance is proportional to the simple velocity. M. Coulomb found also, that the resistance is not percepti¬ bly increased by increasing the depth of the oscillating disk in the fluid; and by coating the disk successively with fine and coarse sand, he’ found that the resistance arises solely from the mutual cohesion of the fluid particles, and from their adhering to the surface of the moving body. 25. The law of resistance discovered by Coulomb, wasExperi- first applied to the determination of the velocity of running ments of M. water by M. Girard, who considers the resistance as repre- irar sented by a constant quantity, multiplied by the sum of the first and second powers of the velocity. He regards the water which moves over the wetted sides of the channel as at first retarded by its viscidity, and he concludes that the water will, from this cause, suffer a retardation proportional to the simple velocity. A second retardation, analogous to that of friction in solids, he ascribes to the roughness of the channel, and he represents it by the second power of the velocity, as it must be in the compound ratio of the force and the number of impulsions which the asperities receive in a given time. He then expresses the resistance due to co¬ hesion by a constant quantity, to be determined experi¬ mentally, multiplied into the product of the velocity of the perimeter of the section of the fluid. 26. The influence of heat in promoting fluidity was known to the ancients ;2 but M. Dubuat was the first person who 1814. investigated the subject experimentally. His results, how¬ ever, were far from being satisfactory; and it was left to M. Girard to ascertain the exact effect of temperature on the motion of water in capillary tubes. When the length of the capillary tube is great, the velocity is quadrupled by an increase of heat from 0° to 85° centig.; but when its length is small, a change of temperature exercises little or no influence on the velocity. He found also, that, in ordi¬ nary conduit pipes, a variation of temperature exercises scarcely any influence over the velocity. 27. The theory of running water was greatly advanced Investiga- by the researches of M. Prony. From a collection of the of M- best experiments by Couplet, Bossut, and Dubuat, he se- lected 82, of which 51 were made on the velocity of water 1 A third volume of this work was published in 1816, entitled Principes d'Hydraulique et Pyrodynamique, relating chiefly to the sub¬ ject of heat and elastic fluids. 2 Qu&st. Nat. VOL. XII. K 74 hydrodynamics. History. Researches of M. Ey- telwein of Berlin, 1801. in conduit pipes, and 31 on its velocity in open canals; and by discussing these on physical and mechanical piinciples, he succeeded in drawing up general formulae, which afford a simple expression of the velocity of running water. 28. M. Eytelwein of Berlin published, in 1801, a valu¬ able compendium of Hydraulics, entitled Jin it dh itch dev Mechanik und dev Hydraulik, which contains an account of many new' and valuable experiments made by himself.^ His work is divided into 24 chapters, the most important of which are the 7th, which treats of the motion of water in rivers, and the 9th, which treats of the motion of water in pipes. He has shown that the mean velocity of water in a second in a river or canal flowing in an equable channel, is |^ths of a mean proportional between the fall in two Eng¬ lish miles, and the hydraulic mean depth; and that the superficial velocity of a river is nearly a mean proportional between the hydraulic mean depth and the fall in two English miles. The following are some of the other important results which are given in his work:—The contraction of the fluid area is 0'64, the coefficient for additional pipes 065, the co¬ efficient for a conical tube similar to the curve of contrac¬ tion 098. For the whole velocity due to the height, the coefficient by its square must be multiplied by 8'0458. For an orifice, the coefficient must be multiplied by 7-8; for wide openings in bridges, sluices, &c., by 6’9 ; for short pipes, 6'6; and for openings in sluices without side walls, 5T. Our author investigates the subject of the discharge of water by compound pipes, the motions of jets, and their impulses against plane and oblique surfaces, and he shows theoretically, that a water wheel will have its effect a maxi¬ mum when its circumference moves with half the velocity of the stream. Mallet and 29. A series of interesting hydraulic experiments was Yici, 1809. ma(]e at Rome in 1809, by MM. Mallet and Vici.1 They found that a pipe, whose gauge was five ounces French measure (or 0-03059 French kilolitres), furnished one-seventh more water than five pipes of one ounce, an effect arising from the velocity being diminished by friction in the ratio of the perimeters of the orifices as compared with their areas. Researches Notwithstanding the investigations of Newton, D’Alem- of M. Pols- bertj an(j Lagrange, the problem of waves was still unsolved; son, 1816. an[j the jnstitute 0f France was induced to propose, as the subject of its annual prize for 1816, “The Theory of Waves on the Surface of a heavy Fluid of indefinite Depth.” M. Poisson had previously studied this difficult subject, and he lodged his first memoir in the bureau of the Institute on the 2d October 1815, at the expiration of the period allowed for competition. M. Poisson supposes the waves to be pro¬ duced in the following manner :—A body of the form of an elliptic paraboloid is immersed a little in the fluid, with its axis vertical and its vertex downwards. After being left in this position till the equilibrium of the fluid is restored, the body is suddenly withdrawn, and waves are formed round the place which it occupied. This first memoir contains the general formula for waves propagated with a uniformly accelerated motion ; but in a second memoir, read in De¬ cember, he gives the theory of waves propagated w ith a con¬ stant velocity. This last class of waves are much more sen¬ sible than the first, and are those which are seen to spread in circles round any disturbance made at the surface of water. In determining the superficial as well as the inter¬ nal propagation of these waves, he considers only the case when the disturbance of the water is so small, that the se¬ cond and the higher powers of the velocity of the oscillating particles may be neglected; and he assumes, that a fluid particle which is at any instant at the surface, continues there during the whole of the motion, a supposition which the condition of the continuity of the fluid renders neces¬ sary. He supposes the depth of the water constant through- History, out its whole extent, the bottom being considered as a fixed horizontal plane at a given distance beneath its na¬ tural surface. He then treats, /zrstf, the case in which the motion takes place in a canal of uniform width, over which obstruction is made of the horizontal dimension of the fluid; and, secondly, the case in which the fluid is considered in its true dimensions. 30. The prize offered by the Institute was gained by M. Researches Augustin Louis Cauchy, then a young mathematician oi the highest promise. In his memoir, which was published in the third volume of the Memoires des Scavans, he treats only of the first kind of waves above mentioned ; and his investigation claims to be more complete than that in the first memoir of Poisson, in so far as it leaves entirely arbi¬ trary the form of the function relative to the initial form of the fluid surface, and, therefore, allows the analysis to be applied when bodies of different forms are used to produce the initial disturbance. From his analysis, M. Cauchy concludes, “ that the heights and velocities of the different waves produced by the immersion of a cylindrical or pris¬ matic body, depend not only on the width and height of the part immersed, but also on the form of the surface which bounds this part.” He is also of opinion, that the number of the waves produced may depend on the form of the im¬ mersed body, and the depth of immersion. 31. The following abstract of the principal results ob- Results of tained by theory, respecting the nature of waves, has been the°i'y re* given by Mr Challis :— waves. ^ “ With respect first to the canal of uniform width, the law of the velocity of propagation found by Lagrange, is confirmed by Poisson’s theory when the depth is small, but not otherwise. “ When the canal is of unlimited depth, the following are the chief results:— “ 1. An impulse given to any point of the surface, affects instantaneously the whole extent of the fluid mass. “ The theory determines the magnitude and direction of the initial velocity of each particle resulting from a given impulse. “ 2. The summit of each wave moves with a uniformly accelerated motion. “ This must be understood to refer to a series of very small waves, called by M. Poisson dents, which perform their movements, as it were, on the surface of the larger waves, which he calls ‘ les ondes dentelees! Each wave of the series is found to have its proper velocity, independent of the primitive impulse. “ 3. At considerable distances from the place of disturb¬ ance, there are waves of much more sensible magnitude than the preceding. “ Their summits are propagated with a uniform velocity, which varies as the square root of the breadth, d fieurd’eau of the fluid originally disturbed. Yet the different waves which are formed in succession, are propagated with diffe¬ rent velocities; the foremost travels swiftest. The ampli¬ tudes of oscillations of equal duration, are reciprocally pro¬ portional to the square root of the distances from the point of disturbance. “ 4. The vertical excursions of the particles situated directly below the primitive impulse, vary according to the inverse ratio of the depth below the surface. This law of decrease is not so rapid but that the motion will be very sensible at very considerable depths ; it will not be the true law, as the theory proves, when the original disturbance extends over the whole surface of the water, for the de¬ crease of motion in this case will be much more rapid. “ The results of the theory, when the three dimensions of the fluid are considered, are analogous to the preceding, 1 See Mallet, Notices Historiques, Paris, 1830. HYDRODYNAMICS. 75 History. Experi¬ ments of Weber and Bidone, 1825. Investiga¬ tions of M Bidone, 1826-7. I, 2, 3, 4, and may be stated in the same terms, excepting that the amplitudes of the oscillations are inversely as the distances from the origin of disturbance, and the vertical excursions of the particles situated directly below the dis¬ turbance vary inversely as the square of the depth.” 32. M. Hachette, in the year 1816, presented to the National Institute a memoir containing the results of expe¬ riments which he had made on the spouting of fluids, and the discharge of vessels. The objects he had in view were to measure the contracted part of a fluid vein; to examine the phenomena attendant on additional tubes ; and to inves¬ tigate and describe the figure of the fluid vein, and the results which take place when different forms of orifices are employed. M. Hachette showed in the second part of his memoir, that greater or lesser volumes of water will be dis¬ charged in the same time through tubes of different figures, the apertures in all having the same dimensions. He also gave several curious results respecting other fluids issuing out of orifices into air or a vacuum. 33. Several very interesting experiments on the propaga¬ tion of waves, have been made by M. Weber and by M. Bidone. Although Weber’s1 experiments were not made in exact conformity with the condition which the theory required, yet they, generally speaking, harmonize with it; and they particularly establish the existence of the small accelerated waves near the place of disturbance, and of a perceptible motion of the particles of the fluid at consider¬ able depths below the surface. When an elliptic paraboloid is used to produce the waves, with its axis vertical, and its vertex downwards, and when, of course, the section of the solid in the plane of the surface of the water is an ellipse, the velocity of propagation is, according to the theory, greater in the direction of the major axis than in that of the minor, in the ratio of the square root of the one to the square root of the other; but this result is not confirmed by Weber’s experiments. In 1826 M. Bidone,2 besides his experiments on waves, made a series on the velocity of running water at the hydraulic establishment of the University of Turin, and he published an account of them in 1829.3 After giving a description of his apparatus and method of experimenting, he gives the figures obtained from fluid veins, sections of which were taken at different distances from the orifice, and the results, which are extremely curious, are illustrated by diagrams. 34. Towards the end of last, and the beginning of the present century, several hydraulic engines were invented, which have proved of great service to the arts. The Bramah press was patented by its inventor in 1796. Like all in¬ ventions of the first class, it has received little if any im¬ provement since it left Bramah’s hand. It derives its great power from the principle of fluids transmitting pressure in every direction. In the year 1775 Mr Whitehurst devised a machine for elevating water, the principle of its action being the momentum of the water itself. This machine was in 1798 much improved by Mr Boulton ; it is now, however, replaced by the more scientific invention known as Mont¬ golfier's hydraulic ram, which is recognised by some as an independent invention, but by others as an improvement on Whitehurst’s. About the year 1817, Hcdl’s machines began to be revived and greatly improved by M. lleichen- bach ; in his hands they were transformed into the elegant yet powerful water-column machines, so extensively em¬ ployed in the German and French mines. 35. M. Poisson’s first memoir on the Theory of Capillary Attraction, was read before the National Institute, Novem¬ ber 1828, in which his object was to form the equations of equilibrium of fluids on physical principles, that is, by sup- History, posing that a fluid mass is made up of distinct molecules, separated from each other by spaces excessively small, and void of ponderable matter. His second memoir, entitled Nouvelle Theorie de VAction Capillaire, was published in May 1834. The principal object which Poisson had in view in this treatise was to bring the theory of capillary attraction to the greatest degree of perfection that the power of analysis and the knowledge of facts would admit. La¬ place’s theory of capillarity, however, is still used to explain the phenomena of the subject. 36. A series of useful experiments was made in 1827 and Experi- 1828, under the sanction of the French government, byments of MM. Poncelet and Lesbros,4at the Military School of Metz. The apparatus which they used consisted of four basins. bros J The first had an area of 25,000 sq. met.; the second one of 1827-28. 1500 sq. met., and a depth of 3*70 met., and was so con¬ trived, by means of sluices, as to have a complete command of the level of the water during the experiment; the third basin, which communicated directly with the second basin, was 3‘68 met. long and 3 wide, to receive the water dis¬ charged by the orifices; and the fourth basin was a gauge capable of containing 24,000 litres. In carrying on the experiments, the opening of the orifices, the height or charge of the fluid in the reservoir, as well as the level of the water in the gauge basin relative to,. each discharge of fluid, were measured to the tenth of a millimetre, so that the approximation was at least ^J^th of the whole result. These experiments were made on rectangular vertical orifices 20 centimetres wide, pierced in a thin plane wall, and completely isolated both from the sides and bot¬ tom of the vessel. The special object which Poncelet and Lesbros had in view was to determine the laws of escape of water from such orifices, limited towards the upper edge by a moveable flood-gate:—1. In the hypothesis of thin plates, where, on the water escaping freely into the air, the orifice is completely isolated from the side walls and bottom of the reservoir ; 2. In the hypothesis where the orifice is more or less near the bottom and sides, and disposed perpendicu¬ larly or obliquely with respect to the plate containing it; 3. In the hypothesis of thick walls, where the water would be immediately received into a course or canal of short length, open at the upper edge ; and, 4. To study the phy¬ sical or mathematical laws of each phenomenon, and to in¬ quire into the causes why the results of experiment differ from those of theory. The experimenters never lost sight of the application of these laws to practice. In the year 1827 M. Poncelet published a Memoire sur les Roues Hydrauliques a Aubes Courbes, containing his experiments on the undershot wheel with curved palettes, which he had invented in the year 1824. The best under¬ shot previous to the introduction of the Poncelet wheel, never developed more than 0'25 of the work of the water, whereas this utilized 0*60 of that work, which is nearly equi¬ valent to the maximum effect of the breast wheel. The principle on which the Poncelet wheel acts, and that which makes it utilize so much of the work of the water, is that the water on entering any curved palette, enters it with¬ out any shock, and continues in this state, till at last, when about to quit the palette, it does so without any sensible velocity. This under-shot wheel is much used in France. Previous to the year 1827, the wheels required in the mills and manufactories of Germany and France were gene¬ rally those which worked with the axis horizontal, or the tub and spoon wheels with the axis vertical; but in that year a young mechanician named Fourneyron introduced a wheel working with the axis vertical, yet wholly different from the 1 Wellenlehre auf Experimente gegrundet, Leipzig, 1825. 2 Turin Memoirs, vol. xxv. 3 Experiences sur la forme et sur la direction des Veines et des Courans d'Eau, lands par diverses ouvertures, 1832. 4 Experiences Hydrauliques sur les Lois de VEcoulement de VEau, etc., 1832. 76 HYDRODYNAMICS. History. Mr George Rennie, 1830. Mr Jar- dine. Improve¬ ment in theory of fluids, by Prof. Airy, 1830. Researches of Prof. Mosely, 1830. Researches of Mr Challis. latter kind. Instead of introducing this horizontal wheel within, as was at that time done, he placed it without the cylinder, opposite its lower part, and separated from it by a small space. In order to put the wheel in motion, water was introduced into the cylinder from above, and escaped by a circular opening at its lower part opposite the wheel. As the cylinder is always kept full of water, the palettes are conveniently struck, and all at once. From this simple ar¬ rangement, it results that this hydraulic engine, or turbine, as it has been called, is the best in use. Shortly after the invention was made public, M. Fourneyron was awarded the prize of 6000 francs, which was offered by the Society for the Encouragement of National Industry. These turbine wheels are mostly used on the Continent; they utilize be¬ tween 75 and 85 per cent, of the work expended by the water. 37. In the year 1830, Mr George Rennie undertook a series of experiments on the friction of water against revolv¬ ing cylinders and disks,on the direct resistances to globes and disks revolving in air and water alternately, on the coeffi¬ cients of contraction, andon the expenditure of water through orifices, additional tubes, and pipes of different lengths. Mr J. Scott Russel’s experiments on the motion of vessels and on waves, and the consequences he deduces therefrom, are to be seen in his Researches in Hydrodynamics, 1837. The late Mr Jardine made several experiments on the discharge of water from long pipes. The waste actually given by the supply pipe from Comiston to the reservoir on the Castle Hill, Edinburgh, was compared with the volume as given by the formulae of Eytelwein, Gerard, Dubuat, and Prony, and he found that the two were nearly coincident. 38. An improvement on the common theory of fluids was lately suggested by Professor Airy, in his lectures at Cam¬ bridge. It had been usual to assume the law of equal pres¬ sure as a datum of observation. Professor Airy, however, has shown that this property may be deduced from another more simple, and equally given by observation; namely, that the division of a perfect fluid may be effected without the application of sensible force ; and hence, it immediately follows, that the state of equilibrium or motion of a mass of fluid, is not altered by a mere separation of its parts by an indefinitely thin partition. Professor Miller has given a definition of fluids founded on this principle, and a proof of the law of equal pressure, at the beginning of his Elements of Hydrostatics, &c., published at Cambridge in 1831. Ur Thomas Young had employed an equivalent principle to that of Mr Airy in determining the manner of the reflection of waves of water and Mr Challis considers it as neces¬ sary in the solution of some hydrostatical and hydrodyna- mical problems. There are certain cases in the analytical theory of Hydro¬ dynamics which require a more simple analysis than others ; such, for example, as those of steady motion, or of motion which has arrived at a permanent state, so that the velocity is constant in quantity and direction at the same point. Equations applicable to this kind of motion seem to have been first given by Professor Mosely, in his Elementary Treatise on Hydrostatics and Hydrodynamics. The fol¬ lowing is the principle from which he has derived them. When the motion is steady, each particle, in passing from one point to another, passes successively through the states of motion of all the particles which at any instant lie in its path. This general principle is applicable to all kinds of fluids, and is true, whether or not the effect of heat is taken into account, provided the condition of steadiness remains. As it enables us to consider the motion of a single particle in place of that of a number, it readily affords the equations of motion. 39. As it was desirable to know how the same equation might be obtained from the general equations of fluid mo¬ tion, Mr Challis undertook this inquiry, and published the History, results of it in the Transactions of the Cambridge Philoso- phical Society? In this paper, he has given a method of doing this both for incompressible and elastic fluids, and he has shown that a term in the general formulae which occa¬ sions the complexity in most hydrodynamical questions, disappears in cases of steady motion. Mr Challis is of opinion that these equations may be employed in very in¬ teresting researches, and he mentions, as instances, the mo¬ tion of the atmosphere as affected by the rotation of the earth, and a given distribution of temperature due to solar heat. 40. The science of Hydrodynamics has of late years been Experi- cultivated by M. Eytelwein of Berlin, by Dr Matthew ments of Young, who has explained the cause of the increased velo-M\Eytel" city of efflux through additional tubes, by Mr Vince, Dr T. wt?in an Young, Coulomb, and Don George Juan. The subject of waves has occupied the attention of Mr Green, Professor Kelland, Mr Earnshaw, and more espe¬ cially Mr Airy, the astronomer-royal, who has given much valuable and original matter in his excellent treatise on Tides and Waves. Our knowledge of the flow of water through orifices and over weirs has been much extended by the experiments of MM. Daubisson and Castel, undertaken between the years 1830 and 1838. Mr Provis, in 1838, experimented on the flow of water through small pipes. About the year 1840, M. V. Regnault instituted a series of interesting experiments, by order of the minister of public works, and at the request of the central commission of steam engines, for the purpose of determining the princi¬ pal laws and numerical data which enter into the calcula¬ tion of steam engines. The nature of his investigations necessarily led him to determine the compressibility of water and mercury, and his results may be considered as very accurate. The experiments are detailed at great length in the Memoires de Vlnstitut for 1847. Professor Magnus of Berlin, in 1848, made several experi¬ ments on the motion of fluids ; they were intended to re¬ fute the notion of Venturi, who, in his Lateral Communi¬ cation of Motion in Fluids, asserts that if any very mobile body be caused to approach a jet of water, the body will be carried forward by the air, to which a motion has been im¬ parted by the jet. He next shows that the action of a jet on a plane, the jet and plane being under the surface of water, increases with the distance from the orifice ; and, lastly, he attempted to ascertain the manner in which the water of the jet mixes with that into which it is projected. Professor Challis has considered the Principles of Hydro¬ dynamics, in the new series of the Philosophical Magazine, 1851. Mr T. E. Blackwell made in 1851 a very extensive and practically useful seriesof experiments on weirs. The last matter that we shall mention in this history of the subject, is the centrifugal pump, improved by Mr Appold. Bramah and Dietz long ago attempted to produce machines work¬ ing by a continuous movement of rotation. Dietz’ centri¬ fugal pump has been a considerable time in use ; it is far surpassed by Appold!s Centrifugal Pump. Mr Appold re¬ ceived for his invention the council medal at the Great Exhibition of 1851. Mr Appold was the first who success¬ fully applied curved vanes to the centrifugal pump. It ap¬ pears, however, that so far back as 1839, curved vanes were adopted in pumps erected in the United States, but for some reason or other, they were replaced by plain straight fins, and therefore of less efficiency. Gwinne, Bessemer, and several others, have made improvements on the centrifugal pump. We refer the reader to M. Ch. Combe’s Sur les Roues d Reaction ou d Tuyaux, 1843; and to a historical review of the Centrifugal Pump in the Practical Mechanic's Maga¬ zine for 1851. 1 Nat. Phil., vol. ii., p. 64. 2 Vol. iii., part iv. HYDRODYNAMICS. 77 PART L—HYDROSTATICS. Hydrosta¬ tics. 41. Hydrostatics is that branch of the science of hy¬ drodynamics which comprehends the pressure and equili¬ brium of non-elastic fluids, as water, oil, mercury, &c.; the method of determining the specific gravities of substances, the equilibrium of floating bodies, and the phenomena of capillary attraction. definitions and preliminary observations. 42. A fluid is a collection of very minute particles, co¬ hering so little among themselves, that they yield to the smallest force, and are easily moved among one another. 43. Fluids have been divided into perfect and imperfect. In perfect fluids the constituent particles are supposed to be endowed with no cohesive force, and to be moved among one another by a pressure infinitely small. But, in imper¬ fect or viscous fluids, the mutual cohesion of their particles is very sensible, as in oil, varnish, melted glass, &c.; and this tenacity prevents them from yielding to the smallest pressure. Although water, mercury, alcohol, &c. have been classed among perfect fluids, yet it is evident that neither these nor any other liquid is possessed of perfect fluidity. When a glass vessel is filled with water above the brim, it assumes a convex surface ; and when a quantity of it is thrown on the floor, it is dispersed into a variety of little globules, which can scarcely be separated from one another. Even mercury, the most perfect of all the fluids, is endowed with such a cohesive force among its particles, that if a glass tube, with a small bore, is immersed in a vessel full of this fluid, the mercury will be lower in the tube than the surface of the surrounding fluid ;—if a small quantity of it be put in a glass vessel, with a gentle rising in the mid¬ dle of its bottom, the mercury will desert the middle, and form itself into a ring, considerably rounded at the edges ; or if several drops of mercury be placed upon a piece of flat glass, they will assume a spherical form ; and if brought within certain limits, they will conglobulate and form a single drop. Now, all these phenomena concur to prove, that the particles of water have a mutual attraction for each other ; that the particles of mercury have a greater attrac¬ tion for one another, than for the particles of glass ; and, consequently, that these substances are not entitled to the appellation of perfect fluids. 44. It was universally believed, till within the last seven¬ ty years, that water, mercury, and other fluids of a similar kind, could not be made to occupy a smaller space, by the application of any external force. This opinion was founded on an experiment made by Lord Bacon, who inclosed a quantity of water in a leaden globe, and by applying a great force attempted to compress the water into a less space than it occupied at first: The water, however, made its way through the pores of the metal, and stood on its sur¬ face like dew. The same experiment was afterwards re¬ peated at Florence by the Academy del Cimento, who filled a silver globe with water, and hammered it with such force as to alter its form, and drive the water through the pores of the metal. Though these experiments were generally reckoned decisive proofs of incompressibility, yet Bacon himself seems to have drawn from his experiment a very different conclusion ; for after giving an account of it, he immediately adds, that he computed into how much less space the water was driven by this violent pressure.} This Hydrosta- passage from Lord Bacon does not seem to have been no- tics- ticed by any writer on hydrostatics, and appears a complete ^ proof that the compressibility of water was fairly deducible from the issue of his experiment. In consequence of the reliance which was universally placed on the result of the Florentine experiment, fluids have generally been divided into compressible and incompressible, or elastic and non¬ elastic fluids : water, oil, alcohol, and mercury, being re¬ garded as incompressible and non-elastic ; and air, steam, and other aeriform fluids, as compressible or elastic. 45. About the year 1761, the ingenious Mr Canton be¬ gan to consider this subject with attention, and distrusting the result obtained by the Academy del Cimento, resolved to bring the question to a decisive issue.1 2 Having pro¬ cured a small glass tube, about two feet long, with a ball at one end, an inch and a quarter in diameter, he filled the ball and part of the tube with mercury, and brought it to the temperature of 50° of Fahrenheit. The mercury then stood six inches and a half above the ball; but after it had been raised to the top of the tube by heat, and the tube sealed hermetically, then, upon bringing the mercury to its former temperature of 50°, it stood T30%th of an inch higher in the tube than it did before. By repeating the same ex¬ periment with water exhausted of air, instead of mercury, the water stood y^th of an inch higher in the tube than it did at first. Hence, it is evident, that when the weight of the atmosphere was removed, the water and mercury expanded, and that the water expanded ^th of an inch more than the mercury. By placing the apparatus in the receiver of a condensing engine, and condensing the air in the receiver, he increased the pressure upon the water, and found that it descended in the tube. Having thus ascertained the fact, that water and mercury are compres¬ sible, he subjected other fluids to similar experiments, and obtained the results in the following table : Millionth Parts. Specific Gravity. Compression of Mercury, 3 13.595 Sea-Water, 40 1.028 Rain- Water, 46 1.000 Oil of Olives, 48 0.918 Spirit of Wine,...66 0.846 Lest it should be imagined that this small degree of com¬ pressibility arose from air imprisoned in the water, Mr Canton made the experiment on some water which had imbibed a considerable quantity of air, and found that its compressibility was not in the least augmented. By in¬ specting the preceding table, it will be seen that the com¬ pressibility of the different fluids is nearly in the inverse ratio of their specific gravities. 46. The experiments of Mr Canton have been since confirmed by Professor Zimmerman. He found that sea¬ water was compressed ^gth part of its bulk, when inclosed in the cavity of a strong iron cylinder, and under the in¬ fluence of a force equal to a column of sea-water 1000 feet in height. From these facts, it is obvious that fluids are sus¬ ceptible of contraction and dilatation, and that there is no foundation in nature for their being divided into compres¬ sible and incompressible. If fluids are compressible, they will also be elastic ; for when the compressing force is re¬ moved, they will recover their former magnitude; and 1 Bacon's Works, by Shaw, vol. ii. p. 521; Novum Organum, part. ii. sect. 2. alph. 45. § 222. * See the Philosophical Transactions for 1762 and 1764, vols. lii. and Uv. T7 78 Pressure, &c., of Fluids. hydrodynamics. hence their division into elastic and non-elastic is equally improper. , A series of very valuable experiments on the compressi¬ bility of water has since that time been made by Professor Oersted of Copenhagen. At the temperature at which water has a maximum density, which, according to 1 ro- fessor Stampfer of Vienna, is at 38 75 Fahrenheit, Pro¬ fessor Oersted found the true compressibility of water by one atmosphere (or 336 French lines of mercury) to be 46-1 millionths of the volume ; the difference between the true and the apparent compressibility arising from the effect of the heat developed by the compression, by which the liquid and the bottle are dilated. He found also that the differ¬ ences of volume in the compressed water are propor¬ tional to the compressing power; and that this law holds as far as the pressure of 65 atmospheres, and probably much farther ; but how far he was not able to determine, as his apparatus could not resist a greater pressure. He re¬ peated Canton’s experiments with great care, and verified his results. Oersted confirms Canton’s result that water is less compressible during summer than during winter. (See Report of Third Meeting of British Association.) Mr Perkins proved the compressibility of water by sub¬ jecting that fluid to mechanical pressure: for a description of his apparatus, see Philosophical Transactions for 1820. Colladon and Sturm have made experiments on the com¬ pressibility of different liquids, and under a pressure of one atmosphere they assign the following:—Water, 0‘0000496; alcohol, 0-0000916; mercury, 0-00000338, each of its own volume. These results are somewhat different from those of Oer¬ sted, but this may be owing to the compression of the tubes or vessels. M. Regnault1 made (in 1854) very accurate experiments on the compressibility of fluids with an apparatus a little different from that which Oersted used ; he found the fol¬ lowing results:—The volume of a mass of water subjected to pressure diminishes by 0-000048 of its volume for every atmosphere; i.e., if a mass of water having a volume of a million litres, when its surface is subjected to no compress¬ ing force, comes to be subjected to a pressure of 1, 2, 3, 4, &c., atmospheres, its volume will diminish by 48 litres, twice 48 litres, thrice 48 litres, four times 48 litres, &c., respec¬ tively. When mercury is the fluid pressed, then it dimin¬ ishes by 0-0000035 of its volume for every atmosphere in¬ cumbent on its surface. 47. The doctrines of hydrostatics have been deduced by different philosophers from different properties of fluids. Euler has founded his analysis on the following property, ‘‘that when fluids are subjected to any pressure, that pres¬ sure is so diffused throughout the mass, that when it re¬ mains in equilibrio all its parts are equally pressed in every direction.”2 D’Alembert at first3 deduced the principles of hydrostatics from the property w'hich fluids have of rising to the same altitude in any number of communicating vessels ; but he afterwards4 adopted the same property as Euler, from the foundation which it furnishes for an algebraical calculus. The same property has been employed by Bossuet, Prony, and other writers, and will form the first proposition of the following chapter. Pressure, &c., of Fluids. CHAPTER I.—ON THE PRESSURE AND EQUILIBRIUM OF FLUIDS. 48. Prop. I.—When a pressure acts on the surface of a per¬ fect fluid which is without weight, and at rest, it is equally pressed in every direction. As it is the distinguishing property of fluids that their particles yield to the smallest pressure, and are easily moved among themselves (26), it necessarily follows, that if any particle is more pressed towards one side than towards another, it will move to that side where the pressure is least; and the equilibrium of the fluid mass will be instantly de¬ stroyed. But by the hypothesis the fluid is in equilibrio, consequently the particle cannot move tow-ards one side, and must therefore be equally pressed in every direction. In order to illustrate this general law, let EF (fig. 1) be a vessel full of any liquid, and let mn, op be two orifices at equal depths below its surface; then, in order to prevent the water from escaping, it will be neces¬ sary to apply two pistons, A and B, to the orifices mn, op with the same force, whether the ori¬ fice be horizontal or vertical, or in any degree inclined to the horizon ; so that the pressure to which the fluid mass is sub¬ ject, which in this case is its own gravity, must be dis¬ tributed in every direction. But if the fluid has no weight, then the pressure exerted against the fluid at the orifice op, by means of the piston B, will propagate itself through every part of the circular vessel EF, so that if the orifices mn, tu are shut, and rs open, the fluid would rush through this aperture, in the same manner as it would rush through mn or tu, were all the other orifices shut. This proposi¬ tion, however, is true only in the case of perfect fluids ; for when there is a sensible cohesion between the particles, as in water, an equilibrium may exist even when a particle is less pressed in one direction than in another; but this in¬ equality of pressure is so exceedingly trifling, that the pro¬ position may be considered as true, even in cases of im¬ perfect fluidity. 49. Prop. II.—If to the equal orifices mn, tu, op, rs, of Fig. 1. a vessel, containing a fluid destitute of weight, be applied equal powers A, B, C, D, in a perpendicular direction, or if the orifices mn, &c., be unequal, a.nd the powers A, B, &c., which are respectively applied to them be proportional to the orifices, these powers will be in equilibrio. It is evident from the last proposition, that the pressure exerted by the power B is transmitted equally to the ori¬ fices mn, rs, tu, that the pressure of the power C is trans¬ mitted equally to the orifices mn, op, tu, and so on with all other powers. Every orifice, then, is influenced with the same pressure, and, consequently, none of the powers A, B, C, D can yield to the action of the rest. The fluid mass, therefore, will neither change its form nor its situa¬ tion, and the powers A, B, C, D will be in equilibrio. If the powers A, B, C, D are not equal to one another, nor the orifices mn, op, rs, tu; but if A : B = mn : op, and so on with the rest, the fluid will still be in equilibrio. Let A be greater than B, then mn will be greater than op ; and whatever number of times B is contained in A, so many times will op be contained in mn. If A = 2 B, then mn = 2 op, and since the orifice mn is double of op, the pressure upon it must also be double; and, in order to resist that pressure, the power A must also be double of B ; but, by hypothesis, A = 2 B, consequently the pressures upon the orifices, or the powers A, B, will be in equilibrio. If the power A is any other multiple of B, it may be shown in the same way that the fluid will be in equilibrio. The application of the principle contained in this propo- 1 Mem. de Vlnst. 1854. 2 Nov. Comment. Petropol., tom. xiii., p. 305. 3 Melanges de Litterature, d'Histoire, et Philosophy. 4 Traiti des Fluides, § 20. HYDRODYNAMICS. 79 Fluids. Fig. 2. Pressure, sition in the case of the Bramah press, constitutes that ma- &c., of chine one of the most perfect instruments with which we ™ "J~ are acquainted; for the power exerted by one man may be employed to balance several thousand tons. 50. Prop. III.—The surface of a fluid of small extent at rest, and subject to gravity, is horizontal. The truth of the proposition is a necessary consequence of gravity acting on the fluid particles. For the attraction of gravity being supposed to be lodged in the centre of the earth, and a surface of small extent being incomparable with re¬ spect to the distance of the attracting centre, we may suppose, without sensible error, that the particles on this surface of small extent are all pulled with the same intensity, and, therefore, they must all be in the same plane, which will be horizontal. For if the plane be not hori¬ zontal, let fig. 2 be a section of the mass, with its surface BSA; take A and B, par¬ ticles of its surface, and BC, AD, vertical columns of liquid molecules, C and D being in the same horizontal line. Now, neglecting the atmospheric column, the pressures at A and B are nothing, but at D and C they are equivalent to the weight of two liquid cylinders AD and BC, having equal bases. Hence, since there is a difference of weights in the columns, A and B cannot be on the same level, and, therefore, the surface BSA of the fluid cannot be in equilibrium. Again, a particle as S would seek its lowest level, and so all others similarly situated, until the whole surface particles over a small extent would be in the same plane; and the pressure at all points of the surface of a fluid being the same, the fluid is in equilibrium, and there¬ fore a fluid surface of small extent will be horizontal. The principle of the proposition is applied in the art of levelling. 51. As the direction of gravity is in lines which meet near the centre of the earth ; and as it appears from this proposition, that the surface of fluids is perpendicular to that direction, their surface will be a portion of a spheroid similar to the earth. When the surface has no great ex¬ tent, it may be safely considered as a plane ; but when it is pretty large, the curvature of the earth must be taken into account. 52. Prop. IV.—Fluids rise to the same level throughout a system of communicating vessels. Suppose that there were alongside of each other several vessels, A, C, E, G, I (fig. 3), of different forms and capaci¬ ties, cylindrical, spiral, conical, or spherical, containing fluid, and communicating with one another by means of a com¬ mon vessel P. Now, if water be poured into this vessel, it follows from Prop. III. (50), that the fluid will stand at a common level in each of the vessels A, C, E, G, I; and if a line be drawn parallel to one surface, it will be parallel to all the surfaces, and it will also be parallel to the horizontal plane. Therefore, also, if we remove the different shaped vessels from the common reservoir, and introduce into the Pressure, vessel ABEF solid bodies, T, GFH, UK, &c., then, after <&c., of each immersion, the surface will still be horizontal; and F1uids. when all the solids have been immersed, we shall have, as it were, a system of communicating vessels in which the surface of the fluid will necessarily be horizontal. 53. When the communicating vessels are so small, that they may be regarded as capillary tubes, the surface of the fluid will not be horizontal, as will afterwards be shown. (See Capillary Attraction, art. 114.) 54. This proposition explains the reason why the surface of small pools in the vicinity of rivers is always on a level with the surface of the rivers themselves, when there is any subterraneous communication between the river and the pool. The river and the pool may be considered as com¬ municating vessels. 55. The practical application of the preceding proposition is finely shown in the methods employed for supplying towns with water. The ancients built aqueducts for this purpose, perhaps not so much from ignorance of the princi¬ ple that water always seeks its own level, as from the diffi¬ culty of making their pipes water-tight at the joints. In modern times, pipes carefully jointed and secured are al¬ most invariably used. The New River Water-works, how¬ ever, which supply part of London with water, embrace both aqueducts and pipes. 56. Prop. V.—The pressure at any point below the sur¬ face of a fluid subject to gravity and at rest, varies as its depth. Let point B (fig. 4) be immediately under the surface at a depth AB. The series of particles in the column AB is at rest,and maybe supposed separated from the rest of the fluid mass, and lodged in a tube, not capillary, or the whole may be supposed rigid or solid like ice. Now, every particle of the column has weight, and so the upper will press upon those lower, and these again on the lowest particles; hence, the pressure on the point B will be equal to the aggregate weight of all the liquid particles; and hence, also, the pressure will vary as the depth of the point below the surface. Similarly, also, let the point subject to Fig.4. pressure be C (fig. 5), not directly under the surface. Take ED a vertical from the surface, and draw DC horizontal; then we may consider the series of particles DC as a solid mass. Now, as the pressure is the same at all points along the line DC, and as the pressure at D is equi¬ valent to a weight of fluid particles DE, so also is the pressure at C of the same value. Therefore, DE being equal to FC, the pressure at C varies Fig. 5. as its depth below the surface of the fluid. 57. Prop. V.— I o find the pressure on a line sunk in a fluid subject to gravity. Let the line be parallel to the surface of the fluid, and the portion of it the pressure on which is required be the unit of length. Let MN (fig. 4) be this portion of the given line at the depth AM. There may be now supposed to be a solidified mass of particles, with base MN and height AM, resting on MN, each particle of which has weight, and wholly separate from the rest of the mass. If, then, a unit of bulk weigh gp, where g expresses the action of gravity on one particle, and p the density of the fluid; and 80 Pressure, if z be the depth of the line, or the number of units in the &c., of depth over the unit of length, the weight of the whole co- Fluids. iumn wiH be expressed by gpz. But this weight is the same as the pressure to which the unit of length is exposed ; let this be p, therefore p=g-p-z- . The same will be the result, if the portion MN were lying oblique to the horizontal surface, the mean depth being z. 58. Cor—Hence, if we have A units of length, or a portion of a line of which the length is A, then if its depth be z, the pressure will be p . A =gpz . A = P. The quantity p is the same for the same fluid, but different for different fluids. Further, in problems of a practical nature, the pressure of the atmosphere on any line or area, equal to that sunk in the fluid, must be added on to the weight of the fluid, so as to obtain the true pressure. hydrodynamics. than the contained fluid, and the pressure on AB of y is Pressure, a column ABDC, which is lighter than the contained fluid. &c., of & Fluids. CD 59. Prop. VI.—If a surface be sunk in a fluid subject to gravity, find the pressure upon it, or on the surface of the vessel containing fluid. Let the given area be A, and suppose it broken up into an infinity of small areas, a, ax, a2, a3, See. the mean depths of which under the surface let be, z, zv z2, z3, Sic.... zH, then the different pressures on these partial areas will be (Prop. V.) respectively, gpza, gpzyax, gpz2av gpz3a3, Sic. ....gpznan; therefore, the total pressure on the surface = gpza + gpzla1+gpz2a2+gpz.ia3+ ... +gpznan. But if Z be the depth of the centre of gravity below the surface, and S the area of the plane, then, by a property of the centre of gravity (see Mechanics), we have #pSZ = gpza + gpzlai +gpz2a2 + gpz3a3 + ... + gpznan. Bui gpSZ is evidently the weight of a column of fluid, of which the height is Z and base is S. Wherefore, the pressure of a fluid on any surface is the weight of a column of the fluid, the base of which is the area of the surface pressed, and the height, the depth of the centre of gravity of the area below the surface of the fluid. 60. Cor. 1.—From this proposition it follows, that the whole pressure on the sides of a vessel which are perpen¬ dicular to its base, is equal to the weight of a rectangular prism of the fluid, whose altitude is that of the fluid, and whose base is a parallelogram, one side of which is equal to the altitude of the fluid, and the other to half the perimeter of the vessel. Cor. 2.—The pressure on the surface of a hemispherical vessel full of fluid, is equal to the product of its surface multiplied by its radius. Cor. 3.—In a cubical vessel the pressure against one side is equal to half the pressure against the bottom ; and the pressure against the sides and bottom together, is to that against the bottom alone, as three to one. Hence, as the pressure against the bottom is equal to the weight of the fluid in the vessel, the pressure against both the sides and bottom will be equal to three times that weight. Cor. 4.—’The pressure sustained by different parts of the side of a vessel are as the squares of their depths below the surface; and if these depths are made the abscissae of a parabola, its ordinates will indicate the corresponding pressures. 61. Prop. VII.—To find the pressure on the bottom of a vessel of any form containing fluid. Pig. 6. If the vessel be as (3, then a pressure, P, arising from the re¬ sistance of the side at a point o, will act perpendicularly in¬ ward, with a force proportioned to the depth of o; and the same will be the case for the several pressures at the dif¬ ferent points of the inclining sides ; but these pressures, as P, may each be resolved into vertical, as S, and horizontal, as R, components, of which all the horizontal ones for every section balance, whereas the vertical components acting downwards and parallel will have a single resultant, which will be an amount of additional fluid, as it were, pressing on the base. On the other hand, in y, of fig. 6, the pressures, as P in points, as o, of the sides acting perpendicularly out¬ wards, may be resolved into vertical and horizontal com¬ ponents : the latter destroy each other at every section; the former, acting upwards or downwards, according to the position of o, have a single resultant, acting in opposition to the general weight of the fluid, which is the same as if a quantity of fluid were removed from the vessel. Hence, if the bases be all equal, and the fluid at the same height in each vessel, whatever be their forms, the pressure on base will be equal to the weight of a column of fluid, having for its base that of the vessel, and for its height the depth of the base below the surface of the fluid. 62. In order to illustrate the preceding propositions, let there be four vessels, A, B, C, D (fig. 7), having bottoms aU of the same area, and closed by plates E, F, G, H, of the same weight. Let the plates also be kept in their places by means of strings passing over pullies, and acted on by the equal weights W, W', W", W"'. These weights will mea¬ sure the pressure of water on the plates, i.e., on the bases of the vessels. For if water be poured into each vessel till there be just enough to balance the weight, or when the plates are about to descend, it will be found that the water will be at the same height in each vessel. 1 he same will be the case, whatever be the shape of the vessels, even although one may be a thousand times more capacious than annthpr. If the walls of the vessel be vertical as a (fig. 6), and its base parallel to the surface, it is clear that the pressure on the bottom will be equal to the whole weight of fluid contained in a. But if the containing vessels be as (3 and y of fig. 6, then the pressure on the base AB in the former case is greater than the weight of the fluid, while the latter is less than that weight. For the pressure on AB of j6, is the weight of a column ABDC, which is heavier 63. Definition.—The centre of pressure is that point of a surface exposed to the pressure of a fluid, to which, if the total pressure were applied, the effect upon the plane would be the same as when the pressure was distributed over the whole surface : Or, it is that point to which, if a force equal to the total pressure were applied in a contrary direction, the one would exactly balance the other or, in other words, HYDRODYNAMICS. 81 Pressure, the force applied and the total pressure would be in equi- &c., of librio. Fluids. If any point of the surface ABC coincide with the Pressure, surface, then 1=0, To find the centre of pressure. Fig. 8. 64. Prop. VIII.—To find the centre of pressure of any plane surface immersed in a fluid to any depth. Let ABC (fig. 8) be a plane surface sunk in a fluid, and in¬ clined at an angle, 6, to the sur¬ face of the fluid which it meets, when produced, in HI. Let/ = AG be the distance of point A from the water-line, or HI, measured along GA:c drawn at right angles to HI in the plane of ABC; let A be the origin of rectangular co-ordinates to which ABC is referred, GAa? the axis of x, and \y, parallel to HI, that of y. EF is an elemen¬ tal area of the surface ABC. Take Y and X as the rectan¬ gular co-ordinates of the centre of pressure. Now the pressure at every point equals the height of a column of particles, and this being so, we may take all the pressures on ABC as parallel forces. Hence, from Sta¬ tics, we have, X. pressure on ABC = moment of pressure on ABC (1), and, Y. pressure on AB C = moment of pressure on AB C (2). If we suppose area ABC to be broken up into a series of very small surfaces as Eh, of which dx and dy are the di¬ mensions, it is evident that the pressure on the whole sur¬ face ABC will be the sum of the pressures on these small elements. But the pressure on the area EF =p .dx .dy = <7P x the perpendicular from EF to lAl .dx.dy=gp (# + /) . sin 9 dx .dy •, where x is the absciss of the infinitely small area EF: The whole pressure on ABC=£^p . dx.dy =99 • sin + /) dx.dy. If we multiply this last by x, it will give us the moment about Ay, and if by y, it will give us the moment about Ax. Wherefore, moment of pressure on ABC about Ay =gp sin x .dx .dy ; and, moment of pressure on ABC about Ax =gp sin •If' x + l)y, dx. dy. Substitute now in (1) and (2) the values thus found, X .gp sin eSfx ■\-V) dx dy=gp sin + /) xdxdy; Y. gp sin x + l) dx dy=gp sin eff(x + l)y dx dy ; or> xIf( x + l) dx + t) x dx dy (3) ; Y^y^a? + /) dx fy-J'J'A + 0 // dx dy (4). Since equations (3) and (4) will give a value for X and Y respectively, the centre of pressure is known. If the surface be curved, and its curvature known, then, on inte¬ grating, we have, X^(« + /) y \x + l) x y dx 'lJ(?:*l)ydx=J(x+l)/-dx very important formulae. VOL. XII. y2 dx &c., of Fluids. which are x y dx=J'xly dx, and ^^J*x d dx If the surface be sunk to a great depth, or /= infinity = X, then will the centre of gravity coincide with the centre of pressure; for, from (3) and (4), since the infinite parts must be equal, \l^J(lx dy = x dx dy; or, xA dx =fx y dx ; Ylffdxdy=tffy dx dy; or’ xSy dx=ify' But the values of X and Y, determined from these last equations, are the co-ordinates of the centre of gravity of a plane area bounded by a plane curve. Hence, under such a condition, the centre of pressure is the same as the centre of gravity. 65. Cor. 1.—A physical plane, one side of which is ex-L°rolla- posed to the pressure of a fluid, may be kept at rest by aries- single force, equal and opposite to the pressure of the fluid applied at its centre of pressure. C0R- 2.—Where a plane lamina of a very small uniform thickness is moveable round its Y axis, the values of X and Y will be those of the co-ordinates of its centre of percussion. Cor. 3.—The centre of pressure of a triangle, the base of which coincides with the level of the water, is at a distance of one-third the height of the triangle from its base. If the summit coincide with the surface, then the centre of pressure will be at two-thirds the height, measuring from the summit. . . 66. The application of the preceding proposition is of the utmost consequence in the case of flood-gates, sea-walls, dykes, brewers’ vats, and the like. SECTION II. INSTRUMENTS FOR ILLUSTRATING THE PRESSURE OF FLUIDS. 67. We have already seen from arts. 59, 61, 62, that the Machine pressure on the bottom of a vessel of any form, does not de- tra(.in(T tjie pend on the quantity of fluid contained therein, but on the hydrosta- area of the base and the depth of the fluid. I he hydrostatic tic para- hellows is an excellent instrument for showing this principle, dox. A and B (fig. 9) are two strong boards, united together by means of leather, so as to form a sort of bellows, but per¬ fectly water-tight, C is a vertical tube communicating with the interior of the bellows. If water, or any other fluid, be poured down the tube C by the funnel F, it will enter the bel¬ lows AB, and raise the upper board A, even though loaded with a heavy weight W. The up¬ per board A will continue to be forced up till either the bellows be full or the tube be filled throughout its whole length. Suppose that an equilibrium subsists between the water in the tube and bellows, and let DE be the height of the column of water in the tube above the surface of water in the bellows. Then the weight of this column DE will be that which supports the whole weight raised; for the fluid DC in the tube is in equilibrium with that in the bellows, and hence the pres¬ sure at the surface of the fluid in the bellows is in equili¬ brium with the column DE. Fig. 9. 82 HYDRODYNAMICS. Pressure, &c., of Fluids. 68. Suppose that the whole vreight raised is W, which in¬ cludes the load, the weight of the upper board and of the leather, let S be the area of the upper board A, s the sec¬ tional area of the tube ; let also p be the unit of pressuie on a unit of surface transmitted fiom the surface at D by the column DE ; then, since fluids press equally in every direction, the upward pressure on the board A will —p . S, which balances the downward pressure of the weight W. Hence ^.S = W. Now, the whole pressure at D=p.^; wherefore we have W=p . S, and pressure at D=p. s. .*. W : pressure at D=p.S :p.s = § : s. W = weight raised = -^. pressure at D, = — . weight of a column DE. s ° Hence the weight which can be raised will be increased if we increase the area of the upper board, or if we diminish the sectional area of the tube, or if we increase the pres¬ sure of the column, i.e., if we lengthen the tube. S 69. In a theoretical point of view the ratio — may become infinitely large; hence any quantity of fluid, however small, may be so employed as to sustain any weight however large. The same instrument may be employed for the same purpose when air or any gas is blown or forced in at the funnel F, and condensed in the bellows. In which case a very heavy weight may be raised by means of a small vertical tube. Hence, a person standing on the hydro¬ static bellows might raise himself by blowing into the tube. Hence, also, a small vertical pipe like that in fig. 9, fitted into a barrel full of water or other fluid, may, when filled with water or other fluid, be a means of bursting the barrel. Similarly, also, it is highly probable, that the sudden formation of inland lakes is due to this pressure of water. For, suppose that a considerable extent of water-tight stra¬ tum forms the roof of a subterranean lake, and that this water, and therefore the roof, is subject to the pressure of a column several hundred feet high ; it is clear that, as soon as the upward pressure of the column exceeds the strength of the material forming the roof, the latter will break up and a lake will be formed. The siphon. ?a The siphon is a bent tube, ABCDE (fig. 10), having two legs, one shorter than the other, wherewith when the shorter end is plunged into a vessel con¬ taining fluid, it may be emptied intoanotherwith- out there being any communica¬ tion between the vessels. Before a transference of Fig. to. the liquid takes place the tube is previously filled with fluid, and its ends stopped by the fingers, then inverted, and the shorter end placed into the vessel which is to be emptied ; the other end being left free, the water escapes by it, and will continue to escape until the level of the water in the vessel be in the same plane as the mouth of the short leg. 71. In order to explain the flow of water through the tube, let us suppose that the end A, after the siphon has been filled, is made water-tight by means of a moveable piston, and that the surface of M is open to the atmo¬ sphere. The inner and outer surfaces of the piston will be exposed to pressure, so also will the surface of fluid in M ; Pressure, the latter, as also the fluid in the short leg, will be subject &c>>. to the atmospheric pressure, but the former will have the Fluids- pressure on the outer face constant, while that on the inner face will depend on its position in the long leg. As the piston rises from A in the siphon leg, the pressure on the inner face of the piston gradually diminishes. If the piston be at F, or in the horizontal part C, its outer face will be subject to the atmospheric pressure, but its inner face to that pressure exercised on the fluid surface of M, less the weight of a column of fluid, the height of which is the ver¬ tical distance of the inner face of the piston above the sur¬ face of the fluid in M. Let the piston be gradually drawn downwards, and the pressure on the inner face increases, since, on arriving at B, which is on the same level as the fluid surface in M, it equals that of the atmosphere. Hence, if the siphon were of the form BFCD, and B and D in the same horizontal line, no water would flow out at B, simply because the pressure at B is the same as that at D. Let, now, the piston be lower than B, then is its inner face pressed not only by the atmosphere on the fluid surface of M, but also by the weight of a fluid column of a height equal to the distance between it and B. The water will then flow out by this leg. The lower, therefore, the piston is, the greater will be the ex¬ cess of the pressure on the inner over that on the outer face; and when it comes to the mouth of the tube at A this excess will be a maximum ; hence, as soon as the pis¬ ton has been withdrawn, a flow of water will take place by the mouth A, with a velocity equal to that with which a body, falling freely from B, would have on reaching A. The velocity of escape, however, will not be accurately the above, owing to the bending of the tube, and also to the friction of the water in passing along the siphon. 72. The pressure of the atmosphere is then a very im¬ portant matter in the action of the siphon, since without this element the fluid would not rise in the shorter leg. If a prepared siphon, i.e., filled with fluid, and its ends tempora¬ rily stopped, were set to act under the exhausted receiver, the fluid would divide itself into two portions ; that in the long leg would fall out on one side, while that in the short leg would fall back into the fluid in the vessel. Again, if the siphon should have, between the surface of the fluid to be emptied and its bend, a distance of more than 32 feet, then it will not work ; if nearly 32 feet, its action will be very sluggish. 73. The filling of the siphon with fluid so as to prepare it for working, is not the best method ; generally a small tube rises vertically from near A, as shown by the dotted lines (fig. 10). The air is drawn out of the siphon by means of this small tube, and as the air is more and more rarified, the water rises to the top of the short leg, then, flowing along the hori¬ zontal portion, if any, enters the long leg and passes out. It is in this way that tuns of wine and other spirits are emptied, without requiring to pierce a hole in the lower end, the bung hole being open; it will suffice if a white- iron siphon be introduced into the bung hole, and the space around the plunged leg be free that the pressure of the at¬ mosphere may be allowed to act. 74. The application of the principle of the siphon in na¬ ture is finely shown in the action of reciprocating, or in¬ termitting springs, that is, of those which flow and cease at regular or irregular periods. A large subterraneous ca¬ vern, or porous bed, may be regarded as a reservoir collect¬ ing water by narrow pipes or channels ; and the only outlet to this collected water will be by natural or artificial pipes rising to the surface, forming, in every respect, a na¬ tural siphon. The reservoir will evidently be drained by the latter pipes, whenever a sufficient head or pressure is upon the collected water. Hence, also, Artesian Wells are but natural siphons. HYDRODYNAMICS. 83 Flotation. CHAPTER II.—ON FLOTATION AND SPECIFIC GRAVITIES. Flotation. SECTION I.—FLOTATION. 75. The consideration of floating bodies enables us to determine the conditions of rest or motion when placed in a fluid; if at rest, whether their position will be stable or unstable, and if in motion, the circumstances under which they rise or sink in the fluid. 76. Prop. I.—A body at rest and immersed in a fluid, is forced upwards by a pressure equal to the weight of the fluid displaced. Proposition Let us suppose first of all, that of Archi' we iiave in the vessel of fluid modes. n) a cubiCal mass M. When the surface ef is horizon¬ tal, the fluid is at rest, and so also is M. The vertical faces of M are pressed equally, and the forces are balanced among themselves ; but the lower and upper face sustain different pres¬ sures ; the excess lies on the for¬ mer, and is equal to the weight of a cubical mass, M, of fluid. Now, since M, which we may suppose Fig. ii. to be a mass of the fluid solidified, is at rest, its weight will act downwards, and the supporting fluid will exert, as it wrere, a pressure forcing it upwards ; and as M is in equili¬ brium, the downward and upward pressures will be equal to each other. Suppose now that we remove the fluid mass M, and introduce a body of a different material, such that the equilibrium shall still be unchanged, it is evident that wre shall have the same upward force of the supporting fluid, and downward force of the body, balancing each other. If the weight of the body immersed be equal to that of the fluid displaced, as will then be the case, the body will be at rest; if the former weight should exceed the latter the body will sink, if the latter the former, the body will float on the surface. 77. Again, the body immersed and at rest in the fluid may be supposed to be of any form as N (fig. 11); then it will be supported in the same way as a similarly condi¬ tioned mass of the fluid would be, that is, the upward and downward pressure of the supporting fluid and body re¬ spectively will be the same. Hence the truth of the pro¬ position. t This proposition is known as the principle of Archimedes, having been first discovered by him. 78. Definition.—When a body floats in a fluid, the plane passing through the body, and coinciding with the surface plane of the fluid, is called the plane of flotation. 79. Prop. II.—When a body floats in a fluid, the weight of the volume which it displaces is equal to the weight of the body, and the downward force of the body, as also the upward force of the fluid, is equal to the weight of fluid displaced. Let S be a body floating in the vessel (fig. 11), a mass M" being above, and M' being below' the plane of flotation, so that the whole mass, say M = M' + M". Now, evidently, when S floats, it is buoyed up by some under pressure, and before immersion took place, a volume of fluid was sus¬ tained in the same manner ; as we have then an upward pres¬ sure supporting at one time a volume M' of fluid, and again a body, a mass of which M' is immersed, it follows that the weight of the floating body and that of the volume of fluid displaced are equal to each other. Again, if we take any point of the surface of the mass below the plane of flotation, then the pressure at this point of the body will be the weight of a fluid column of a height equal to the depth of that point below the surface ; and the same holds true for all the other pressures on the other points of the mass immersed, i.e., the weights of the several fluid columns. But the weight of all the fluid columns equals that of the fluid displaced, hence the downward pressure of the body and the upward pressure of the sus¬ taining fluid each equals the weight of the fluid displaced. Call V the volume of the floating body, p its density, then its weight is (M' + M") g=^pg. Call V' the volume of M', and p the density of the fluid, then weight of dis¬ placed fluid = V'p'^; .'. Xpg=Vpg, ox Vp = V'p'. Ifp=p then V = V', and the body will be wholly under the fluid. 80. Cor.—From this proposition, we learn that a float- Corollary, ing body is buoyed up by a force equal to the weight of the fluid displaced. This follows from the principle of Archi¬ medes, and means that a body either floating or wholly im¬ mersed, loses as much of its weight as equals that of the fluid displaced. Hence a bucket full of water placed in its own medium is lighter than when surrounded by air. The application of the preceding proposition is finely shown in Green’s Canal Lifts, whereby laden barges may be transferred vertically from one level to another of a canal; for an account of which we refer to the Trans. Inst. Civ. Engin. 4to, vol. ii., p. 185. 81. When a body is not at rest in a fluid, it will ascend or descend with a moving force equal to the difference be¬ tween the weight of the solid, or part of the solid immersed, and the weight of an equal volume of the fluid. It is on this principle that the Camel is explained. Two large boxes or chests, with a number of separate compartments in each, are filled with water, and sunk one on each side of a sunken vessel which is to be raised, the chests being made fast to the keel by straps passing underneath it. The water is now pumped out, and the buoyant power of the chests raises the vessel. This is also the principle on which life-preservers act. Fish also owe their equilibrium to the same principle, since on rising or sinking the weight of the column of water diminishes or increases and so expands or contracts their body. 82. Definition.—Metacentre.—Let the body be slightly Metacentre, disturbed through a small angle, then by the metacentre is meant, the point of intersection of the vertical line through the centre of gravity of the fluid displaced, and the vertical line through the centre of gravity of the body when at rest. 83. Prop. III.—If a body float in a fluid, the line joining the centres of gravity of the body, and the fluid dis¬ placed is in the same vertical. The floating body, we have seen, presses downwards, and the fluid presses upwards with an equal force ; we may therefore reckon these pressures as forces acting respec¬ tively at the centre of gravity of the body, downwards, and at the centre of gravity of the fluid displaced, upwards. Hence, the body cannot be at rest, unless these forces be equal and opposite, i.e., unless the line joining the centres of gravity of the body and of the fluid displaced be in the same vertical. 84. Cor.—In all other positions the forces will consti- or tute what is called a statical couple, which admits of no single resultant of the two components. i 84 Flotation. HYDRODYNAMICS. 85. We can now determine the conditions under which a floating body will remain at rest: these are ls£, That the weight of the body be equal to that of the fluid displaced; and 2d, That the centre of gravity of the body, and the cen¬ tre of gravity of the fluid displaced, be in the same vei- tlC86. In all cases of the equilibrium of floating bodies these conditions must obtain. They are insufficient, how¬ ever to determine the nature of the equilibrium, but refer to a motion of translation upwards, downwards, or forwards, not to a motion of rotation. Thus, suppose a body floating in a fluid to be at rest, and let it be struck obliquely, then the body will move under the influence of two motions— one of translation, the other of rotation. By the first, the body will oscillate backwards and forwards, till, after a time, it will resume its original position. By the second, the motion will differ with the nature of the floating body ; but these motions may be referred to three classes :—1^, When the body oscillates about its original position, and at last returns to it. 2d, When, after passing through a cer¬ tain angle, the body remains at rest, without recovering its first position, ‘id, When it has no tendency whatever to come back to its first position, but continues to recede the farther from it. 87. In these three cases we have the nature of the equi¬ librium of floating bodies. Hence the first gives us an equilibrium of stability, the second one of neutrality or in¬ difference, and the third, one of instability. A floating body, therefore, is said to be in stable equili¬ brium, when, on suffering a slight displacement, or being made to revolve through a certain angle, it returns to its first position. A floating body is said to be in neutral or indifferent equilibrium, when, on being slightly disturbed, it will rest in any position. A floating body is said to be in unstable equilibrium, when, on receiving a slight disturbance, it continually de¬ parts from its first position. 88. The nature of the equilibrium of a floating body is a very important matter, more especially in ship-building, and in the distribution of the cargo, as also of the ballast of a vessel. 89. Prop. IV.—To determine when the equilibrium is stable, unstable, or neutral. Let AB (fig. 12) be a body floating in a fluid, g the centre of gravity of the body, mg the di¬ rection of gravity when the body was at rest, as in the dotted figure, but which, when the body has been dis¬ placed, lies in gw; g the centre of gravity of the fluid displaced. Pass a vertical through g, meeting gm in m \ m xs, called the metacentre ot the body. Now, the weight of the body at g acting down, and the pressure of the fluid at g acting up, w tend to bring the body back to its Pig. 12. position of rest. Hence, when m is above g, the equili¬ brium is stable. This is the case when the body is loaded at the lowest parts, and it is clear that the action of each will be to bring g to the lowest position it can take. When m is below g, then, the fluid pressing upwards, and the weight acting downwards, will each tend to move the body farther and farther from its first position, so that the equilibrium is unstable. When m coincides with g, then the forces being equal and opposite, and acting at the same point, the body will rest in that position, and the equilibrium will be neutral Flotation, or indifferent. 90, Cor.—Hence the necessity of having the heavier Corollary, goods of a ship’s cargo stowed away at the bottom of the vessel, and of having the ship properly ballasted, or the keel well laden. For the masts and rigging may tend to raise the centre of gravity of the ship above the metacentre, in which case the vessel would be thrown on her beam ends. Similarly, also, it is much more safe to sit in a small boat than to stand upright, for the centre of gravity of the craft is low in the former, but high in the latter case. SECTION II.—SPECIFIC GRAVITIES. 91. Definition.—By the specific gravity of a substance is Specific meant the ratio subsisting between the weights of equal gravities, volumes of that substance and some other known substance taken as a standard. 92. It has been agreed among philosophers to take as the standard of comparison the purest distilled water, at a tem¬ perature of 60° Fahr., and when the barometer is at 30 inches; the values or quotients of the ratios expressing the specific gravities of different substances, being all set down in a table of specific gravities. Thus the weight of a cubic foot of pure platinais 19,500 ounces, but the weight of a cubic foot of standard water is 1000 ounces ; therefore the ratio be¬ tween the former and latter numbers, or —=19*5 = the specific gravity of pure platina—that is to say, since all matter is equally heavy, that there are 19^ times more mat¬ ter in a cubic foot of platina than there is in a cubic foot of pure distilled water. If, then, unity or 1 be taken as the specific gravity of water, 19-5 will be that of pure pla¬ tina, or we have only in the table to count off from right to left three places, so as to obtain the specific gravity of the several substances there set down. 93. With respect to the specific gravities of the gases, on the other hand, they may be reckoned in terms of water or atmospheric air ; in either case we shall have the same results. Biot and Arago have deduced from very accurate experiments, that when the temperature was at 59° Fahr., air was 800 times lighter than water, and when at the freez¬ ing point, it was 770 times lighter. The weight of a cubic foot of air, then, being taken as 1 ounce, 1000 such volumes will weigh 1000 ounces. But it is found that 1000 cubic feet of hydriodic acid weighs 4300 ounces. Hence the specific gravity of hydriodic acid is the ratio between the latter and the former numbers, or = 4*3. 94. Prop. V.—The densities of different substances are as their specific gravities. Let A and B be the bodies, having volumes V and V', and densities p and p, respectively; then, A weighs Vp^, while B weighs V'p'iy. If the substances be compared with the standard fluid, the density of which, like the spe¬ cific gravity, is unity, the weights of volumes V and V of it will be Vg and \'g ; therefore, Sp. gr. of A = and sp. gr. of B = ; or, Sp. gr. of A : sp. gr. of B = = P : p'- 95. Cor.—The specific gravity of different substances Corollary, will be as the weights of equal bulks of the substances. 96. Prop. VI.—If a body be immersed in a fluid, the weight lost is to the weight of the body, as the specific gravity of the fluid is to the specific gravity of the body. HYDRODYNAMICS. 85 Specific Suppose that W is the weight of the body, and W that Gravities. ]ost by immersion ; then W-W' is the weight by which it sinks, since W' is the weight of the fluid displaced. Let V be the volume of the body, p and p the density of the body and fluid respectively ; then W = Vp(/, and W' = Vp'/7- /. W' : W = Yp'g : Ypg = p P- But (by Prop. V.) = Specific gr. of fluid : specific gr. of body. 97. Prop. VII.—To find the specific gravity of a substance. Let W be the weight of the body in air, W' its weight in water; then weight lost = W - W' = weight of fluid dis¬ placed, and the volume displaced = that of the body. Hence W - W' is the weight of a volume of fluid equal to the volume of the body. Therefore, by def. 92, W Specific gravity of substance = - ^ . Let the body be lighter than water; then, in order to make it sink, let a different body be attached to it, the weight of which is W1 in air, and W2 in water. Let also W' be the weight of both bodies in the water. Then, W being weight of body, Weight of water equal in volume to both bodies =W + W,—W' Weightof water equal in volume to attached body =W1 — W2 Weight of water equal in volume to the body the specific gravity of which is required=W1 + W2 — W/ by subtraction; W .-. Specific gravity of body=^— If the body be soluble, as sugar, &c., in water, it must be inclosed in wax or some other envelope, and a process similar to the last case will determine its specific gravity. 98. Prop. VIII.—To find the specific gravity of a com¬ pound body. All bodies of the same material have always the same specific gravity; but a compound body has a specific gravity different from that of either of its components. Let V and V' be the volumes of the components, p and p their densities, p that of the compound; then (v+v‘) p = vp+yp; or, (v+v)£=ve.+v£- P'2 Pi, ' P2 where p2 = unity or 1 ; or, (V + V') S'' = VS + V'S', since specific gravities are as their densities (94) ; Specific gravity of compound = S" = ^. 99. It is said that Hiero, king of Syracuse, gave a gold¬ smith a quantity of pure gold to be made into a crown. On the crown being brought to him and examined, Hiero sus¬ pected that the goldsmith had adulterated the pure metal; he therefore inquired at Archimedes if his suspicions could be verified or disproved without injuring the crown. Ar¬ chimedes, shortly after, showed Hiero that the crown was alloyed with a base metal. The adulteration must have been detected by the principles already explained. 100. Prop. IX.—To find the specific gravity of a fluid. Let a vessel be filled with the fluid, and, being weighed in air, let its weight be W, and let W' be the weight of the vessel when empty; let also the same vessel when filled with pure distilled water, and weighed in air, be W" ; if care be taken, the volumes of the fluid and of the water will be the same. Now the volume of the fluid weighs W — W, while an equal volume of water weighs W" — W'; .\ Specific gravity of fluid = ^ 101. Cor.—After the same manner the specific gravity of atmospheric air, or any of the gases, or even fine powders, may be obtained. Specific Gravities. 102. Prop. X.—The specific gravities of two fluids may be compared by weighing the same solid in each. Let the body weigh W in air, Wj when immersed in the first fluid, W2 in the second ; then, Weight of first fluid displaced = W — Wj and Weight of second fluid displaced = W — W2. But each of these expressions is the weight of equal volumes of different substances ; therefore (Cor. 95) if S! and S2 be the specific gravities of the first and second fluid ; Sp. gr. of first fluid : sp. gr. of second fluid=W —: W —W2; or, Sl : S,=W-W, : W-Wa: 103. Prop. XL—When several fluids are thrown together into the same vessel, they will either become a com¬ pound fluid, or remain unmixed, and superposed above each other, their surfaces being horizontal. Let the fluids have volumes V1? V2, V3, &c....Vn, re¬ spectively, and corresponding specific gravities, Sj, S2, S>3, &c....S„; then, when the fluids mix together, the specific gravity of the new fluid will be found by art. 98 to be s = v,s, H- v,s,+ v,s, + ... + VA v1 +v2 + v3 + ... + Vn 104. If the fluids do not mix, then they will range them¬ selves according to their specific gravi- M ties, and equilibrium will be attained when the common surface of any two of them is horizontal. For suppose that we have a vessel M (fig. 13), containing say two fluids, the heavier AB lowest, and its surface assuming the outline AB, and a lighter fluid above it. Take CAEandDBF, vertical lines, C and D being points in the horizontal surface of the lighter fluid, A P>g-13- and B points on the surface of the heavier, E and F hori¬ zontal points in the depth of the same fluid. Now, it is evident, that at points C and D, on the horizontal surface of the upper fluid, the pressures are equal; and if the same fluid had filled the vessel, those at E and F would also have been equal, being caused by the weight of a column extend¬ ing from F or E to the surface. But the pressures at A and B of the heavier fluid are unequal, the former being pressed by a lighter column than the latter ; and although the cylindrical columns DF, CE are of the same dimensions throughout, yet in the latter there is a greater quantity of the heavier fluid than in the former; the difference of weights of the columns cannot be compensated by the less heavy fluid, and consequently the pressures at the points E and F are unequal. Hence equilibrium cannot obtain ; for before an equilibrium can subsist, it is necessary and sufficient that the points in the same horizontal plane should be pressed equally ; this can only obtain when the surface A B is truly horizontal. It is not necessary that the differently dense and immiscible fluids should range themselves in the vessel according to their weights. It is quite possible for a heavy fluid to be uniformly distributed over the surface of a lighter fluid, hut in such a position, the equilibrium would be unstable, and the slightest displacement of the vessel from one side to the other would cause the heavy fluid to de¬ scend and assume the lowest position in the vessel. If, then, several fluids of different densities, and which do not mix, be thrown into a vessel, and the vessel shaken for any length of time, and then allowed to stand, the fluid 86 HYDRODYNAMICS. F - Of Specific particles of the same kind will gradually settle in the order Gravities. 0f fliejr specific gravities, and with plane horizontal surfaces. SECTION III.—ON THE HYDROMETER. 105. In order to determine with expedition the strength of spirituous liquors, which are inversely proportional to their specific gravities, an instrument more simple, though less accurate, than the hydrostatic balance, has been gene¬ rally employed. This instrument is called a hydrometer, sometimes an areometer and gravimeter, and very errone¬ ously a hygrometer by some foreign authors. It seems to have been invented by Hypatia, the daughter of Theon Alexandrinus, who flourished about the end of the fourth century ; though there is some foundation for the opinion that the invention is due to Archimedes. 106. The Common Hydrometer was invented by Fahren¬ heit, and is the simplest of this class of in¬ struments. It consists of two hollow spheres, C and D (fig. 14); BFE is a delicate cylindri¬ cal stem, nicely graduated; and D is loaded with mercury or lead, that the centre of gravity of the instrument may be below that of the fluid displaced. Let V = volume of this Common Hy¬ drometer and k the section of the gradu¬ ated stem. Let the instrument be placed in a fluid A of a density p, and let it sink to a depth E, while in another fluid, B, of a density p', it sinks to F; let also the depths of E and F from the zero point, or top of the stem, be x and y divisions respec¬ tively. Then, volume of fluid displaced of A = (V — xh), and volume of flu id displaced of B = (V — yk) ; the weights of which are respectively (V — xk)gp, and (V - yk)gp. But as the weight of the fluid displaced is equal to the weight of the body immersed, we have (Y-xk) gp = (V - yk) gp ; or, (V - xk) : (V - yk) = p : p= specific gravity of B : specific gravity of A (94). Specific gravity of’A = specific gravity of B . ^ ~ \ — xk ~ ^ since B is regarded as the standard fluid of which the specific gravity is unity or 1. Jones’s hy- 107. Jones's Hydrometer (fig. 16) is a simple and accu- drometer. rate instrument, requiring only three weights to discover the strengths of spirituous liquors from alcohol to water. It is adjusted to the tempera¬ ture of 60° Fahr., and has an attached thermo¬ meter, so as to make due allowance for a varia¬ tion of the temperature. In fig. 16, the whole instrument is repre¬ sented with the thermometer attached to it. Its length, AB, isabout9^inches; the ball C is made of hard brass, and nearly oval, having its conjugatefoJ diameter about 1^ inches. V^/ The stem AD is a parallele¬ piped, on the four sides of which the different strengths of spirits are engraved: the three sides which do not ap¬ pear in fig. 16 are repre¬ sented in fig. 15, with the three weights numbered 1, 2, 3, corresponding with the sides similarly marked at the top. If the instrument, when placed in the spirits, sinks to the divisions on uie stem without a Eig. ie. weight, their strength will be shown on the side AD marked Fig.14. 0 at the top, and any degree of strength from 74 gallons in the Of Specific 100 to 47 in the 100 above proof will thus be indicated. Gravities. If the hydrometer does not sink to the divisions without a weight, it must be loaded with any of the weights 1,2, 3, till the ball C is completely immersed. If the weight No. 1 is the necessary, the side marked 1 will show the strength of spirits, from 46 to 13 gallons in the 100 above proof. If the weight No. 2 is employed, the corresponding side will indicate the remainder of over proof to proof, marked P in the instrument, and likewise every gallon in 100 under proof, down to 29. When the weight No. 3 is used, the side similarly marked will show any strength from 30 gallons in the 100 under proof, down to water, which is marked W in the scale. The small figures, as 4 at 66, 3|- at 61, 2^ at 48 (fig. 16) indicate the diminution of bulk which takes place when water is mixed with spirits of wine in order to reduce it to proof: thus, if the spirit be 61 gallons in the lOOover proof, and if 61 gallons of water are added in order to render it proof, the magnitude of the mixture will be 3^ gallons less than the sum of the magnitudes of the ingredients; that is, instead of being 161 it will be only 157^ gallons. The thermometer F connected with the hydrometer, has four columns engraved upon it, two on one side as seen in the figure, and two on the other side. When any of the scales upon the hydrometer, marked 0, 1,2, 3, are employed, the column of the thermometer similarly marked must be used, and the number at which the mercury stands carefully ob¬ served. The divisions commence at the middle of each column which is marked 0, and is equivalent to a temper¬ ature of 60° of Fahrenheit; then, whatever number of di¬ visions the mercury stands above the zero of the scale, the same number of gallons in the 100 must the spirit be reck¬ oned weaker than the hydrometer indicates, and whatever number of divisions the mercury stands below the zero, so many gallons in the 100 must the spirit be reckoned stronger. 108. Nicholson's Hydrometer (fig. 17) serves to deter- jiieholgQirs mine the specific gravity of both solids hydrome- and fluids. A hollow light body, A, is ^ c ^ ter. pierced by a graduated delicate stem D, carrying a dish, C, for weights, and a cup, B, loaded so as to insure a stable equili¬ brium in the instrument. The instrument is always sunk to the same depth by weights placed in the upper dish. 1. To find the specific gravity of a body with this instrument, let W be the weight of the hydrometer, W' weight of fluid displaced when the stem is at D, w that weight placed in the dish so as to sink it to this depth. Let also X be the weight ot the body, the specific gravity of which is required, and Y the weight of a corre¬ sponding volume of fluid equal to the bulk of the body. Then, X Specific gravity of solid =^. Let the body be put first in the upper cup, and let w be the weight required to Fig. 17 sink the instrument to D, then, when the body is not put on C, we have W'=-W + iv, but the body beintj on C, we have also W' = W + XW; .'.X = w-w. INow, let the body be placed in the lower cup B, and let a weight w" sink the instrument to D ; then again, W + Y = W + X + w", from which if we subtract W = W + X + w, gives us Y = w" - tv ; .’. Specific gravity of body = ^ = —— 2. In order to compare the specific gravity of two fluids with this instrument, let again W be its weight, and w that re- Of Specific Gravities. Barometri¬ cal areome¬ ter. Say’s ste¬ reometer. HYDRODYNAMICS. 87 W +10 an instrument quired to sink the stem to D in the fluid A, and w in the fluid B. Then, Weight of the displaced fluid of A = W + w and Weight of the displaced fluid of B = W + w'. But these two weights being the same, and the specific gravities of two fluids being as the ratio of equal bulks of them ; Sp. gr. of A : sp. gr. of B = W + w: W + w. Let • * c \ "W ZU B be the standard fluid, and specific gravity of A = 109. The Barometrical Areometer is which is more useful for the purposes of illustration than of measurement. If two immiscible liquids are poured into a two-branched tube ACB, the one into the branch BC, and the other into the branch AC, till they balance each other, their specific gravities will be to one ano¬ ther inversely as the heights of each column. Thus, if we pour in mercury at A, and wa¬ ter at B, so that when the surface of the mercury is at D, that of the water is at E, we shall find that if the column of mercury DF is two inches, that of the water EG will be 27 inches, and their specific gravi¬ ties will be as 27 to 2, or as 13^ to 1. If we pour in at B linseed oil in place of wa¬ ter, the height EG will be 29 inches, and the specific gravity of the oil 0'931 ; be¬ cause 27 ft. : 2 in.= 13^ : 0’931. By thus using mercury as the balancing column, the specific gravities of all fluids that do not mix with it, or act upon it, may be readily as- Fig. is. certained. The results thus obtained are not affected by the admission of the air at the open ends A and B, because the same weight of air presses upon the two balancing co¬ lumns. But if we pour in mercury at A till the bent tube ACB contains above thirty inches of it, and close up the end A, and remove the air from above the mercury in AC, the column of mercury, being no longer pressed down by the air in AC, will be pressed up to near the top of the tube A by the pressure of the column of air in BC, and the in¬ strument becomes a barometer, a column of air balancing a column of mercury. In this case, the tube BI becomes unnecessary, and the mercury may be inclosed in a glass ball at I, with an opening to admit the air. 110. Saifs Stereometer (fig. 19) is for the pur¬ pose of determining the volumes, and from these the specific gravity of liquid bodies, soft bodies, porous bodies, and powders, as also solids. The instrument consists of a glass tube of uniform bore, ending in a cup PE, the mouth being ground truly plane, and capable of being ren¬ dered air-tight by the plate of glass E. The cup PE contains the substance B, the volume of which is wanted. Take off the covering plate E, and immerse the tube PC in a vessel D of mercury till the mercury reaches P. Now cover the cup with the plate E, and raise PC till the mercury is at M, and its level in D at C ; the height of the mercurial column in PC is now CM. As there is still so much air in PE, let its volume be u before B was put in, and v that of the solid in the cup, k the horizontal section of PC, h the altitude of the mercurial column in PC, and p the density of mercury. When the column reached P, the volume of air = u — v, and'its pressure=; when again it 0 = u-v + k . PM, and its pressure=grp (A-CM). Since, Of Specific then, the pressure of the air varies inversely as the space it Gravities, we have u — v k. MP u — v — h : /t — CM ; /< -MC, V—U — occupies, MC -k. PM. staktome- ter. Fig. 19. So also u may be found, the cup being empty: k will be found by weighing the mercury filling a certain por¬ tion of the tube. Thus, since a cubic inch of mercury weighs at 16° Fahr. 34291 grains nearly; therefore, if the mercurial column in PC be a inches, and its weight be w grains, w = 3429J . (volume of mercury in PC) = (3429'5) xk . a, where k is an area or square inches. If then the solid B be a weight = tt>, its specific gra- W vity = —• v The specific gravity of powders and soluble substances may be found in the same manner. 111. The Staktometer, or Drop-measurer, is shown inBrewster fig. 20, where ABC is a glass vessel four or five — inches long, having a hollow bulb, B, about half an inch in diameter. The instrument is filled by suction, and the fluid is discharged at C till it stands nearly at the point m, the zero of the scale. The fluid is then allowed to discharge itself at C by drops, and the number of them is counted till the surface of the fluid descends to another fixed point n. The experiment is then carefully repeated at different temperatures, till the number of drops of distilled water occupied by the cavity between m and n is accurately de¬ termined for various temperatures. The same experiment is made with alcohol. Ihus, if N is the number of drops of distilled water whose specific gravity is S(, and n the number of drops 'c of alcohol whose specific gravity is s, and d the Fig.20. number of drops of any other mixture of alcohol and water contained in the same cavity mn, we shall have (tf-N) (S-s) w-N ; and therefore g (d-N) (S-s) « — N will be the specific gravity of the mixture required. With a small instrument, the number of drops of ivater between m and n was 724, whereas the number of drops of ordinary proof spirits was 2117 at 60° Fahr. Now, as the specific gravity of the spirits was ’920, and that of water I'OOO, we have a scale of 1393 drops for measuring all spe¬ cific gravities between *920 and 1000, an unit in the fourth place of decimals corresponding to a variation of about two drops. From this experiment it follows that the bulk of a drop of water will be about 2‘93 times as large as the bulk of a drop of the spirits. ] 12. Sikes’ Hydrometer (fig. 21) is used in Up gikes’ hy- the collection of the revenue of the United drometer. Kingdom ; it determines the relative quantity of alcohol and water which wine and spiritu¬ ous liquors contain. If in the spirit to be tested there be more water than alcohol, the hydro¬ meter will show that it is below proof; if the contrary, above proof. The only difference be¬ tween Sikes’ and the common hydrometer is that the stem of this is thin and flat; it has besides eight small weights which may be placed on the lower stem, D, so as to increase the weight of the instrument, since the specific gravity of light fluids would prevent it from sinking without the addition of one or more of these weights to the •N : S-s= d-N: O D Fig. 21. was at M, and in D at C, the air in EPM occupied a space lowest division on the graduated stem in a heavy fluid. HYDRODYNAMICS. 88 Of Specific Let V = volume of the instrument, W its weight, K Gravities, the area of a section of CE. When placed in the fluid A let X be the weight at C, and P the surface of the fluid; when it floats in B, let Y be the weight at C, and Q the surface of the fluid, and let II, S be the respective volumes of X and Y ; then, Weight of fluid A displaced = W +X, and B ... =W +Y Volume of fluid A displaced = V + R - K . CP, and ... B ... = V + S — K. CQ; /. W + X = specific gravity of A x (V + R — K . CP), W + Y = specific gravity of B x (V + S - K . CQ) ; Specific gravity of A : specific gravity of B = (W +X)(V + S - K. CQ): (W + Y) (V + R-K.CP); .•. Specific gravity of A = specific gravity of B x (W + X) (V + S-K.CQ) (W + Y) (V + R-K .CP) (W + X) (V + S-K.CQ) “(W+Y) (V + R-K.CP’ the standard fluid being B. SECTION IY. ON TABLES OF SPECIFIC GRAVITIES. 113. As the knowledge of the specific gravities of bodies Tables of is of great use in all the branches of mechanical philosophy, specific we have given the following table, computed by Mr Tod, gravities, civil engineer, and published in the second edition of his excellent work, entitled Series of Tables, and which ought to be in the hands of every engineer, architect, and country gentleman :— Of Specific Gravities. The Specific Gravity of Bodies calculated to Avoirdupois Weight. > Name of Bodies. Metals. Antimony, cast Zinc, cast Iron, cast Tin, cast Tin, hardened.. Pewter Iron, bar Cobalt, cast Steel, hard Steel, soft Iron, meteoric hammered Nickel, cast. Brass, cast Brass, wire Nickel, hammered. Gun metal Copper, cast Copper, wire....... Copper, coin Bismuth, cast........ Silver, hammered. Silver, coin Silver, pure, cast. Rhodium Lead, cast Palladium ic, | Weight of a Cubic foot in ozs. and lbs. Mercury (quicksil- 1 ver), common.... J Mercury (do.), pure... Gold, trinket Gold, coin Gold, pure, cast Gold, hammered Platinum, pure Platinum, hammered Platinum, wire Platinum, laminated Iridium, hammered.. Earth, Stones, &c. Amber Coal Sand Brick Sulphur, native Opal Clay Gypsum Porcelain, Limoyes.. Porcelain, China Stone, paving 6702 7190 7207 7291 7299 7471 7788 7811 7816 7833 7965 8279 8395 8544 8666 8784 8788 8878 8915 9822 10510 10534 10744 11000 11352 11800 13568 14000 15709 17647 19258 19316 19500 20336 21041 22069 23000 1078 1250 1500 2000 2033 2114 2160 2280 2341 2385 2416 lbs. 418-8750 449- 3750 450- 4375 455- 6875 456- 1875 466-9375 486-7500 488-1875 488- 5000 489- 5625 497-8125 517-4375 524-6875 534-0000 541-6250 549-0000 549-2500 554-8750 557-1875 613-8750 656-8750 658-3750 671-5000 687-5000 709-5000 737-5000 848-0000 875-0000 981-8125 1102-9375 1203-6250 12100625 1218-7500 1271-0000 1315-0625 1379-3125 1437-5000 67-3750 78-7500 93-7500 125-0000 127-0625 132 1250 135-0000 142-5000 146- 3125 147- 2500 151-4000 Weight of a Number of Cubic inch Cubic inches in ozs. ' in a lb. 3- 8748 4- 1608 4-1707 4-2193 4-2239 4-3234 4-5069 4-5202 4-5231 4-5329 4-6093 4-7910 4-8582 4- 9444 5- 0150 5-0833 5-0856 5-1377 5-1591 5- 6840 60821 6- 0960 6-2175 6-3657 6-3694 6- 8287 7- 8518 8- 1018 9-0908 10- 2123 11- 1446 11-2042 11-2847 11- 7685 121765 12- 7714 13- 3101 0-62384 0-72337 0-86803 1-15740 1-17650 1-22337 1-25000 1-31944 1-35474 1-38020 1-39814 Cubic ins. 3-8866 3-8431 3-8364 3-7920 3-7878 3-7007 3-5500 3-5396 3-5373 3-5296 3-4792 3-3395 3-2933 3-2359 3-1903 3-1476 3-1461 3-1140 3-0959 2-8149 2-6306 2-6246 2-5733 2-5134 2-4355 2-5134 2-0377 1-9748 1-7600 1-6124 1-4356 1-4280 1-4178 1-3595 1-3140 1-2528 1-2021 25-6474 21-9428 18-4320 13-8240 13-5996 130785 12-8000 12-1263 11-8103 11-7351 11-4437 Name of Bodies. Earths, Stones, &c. Stone, common Flint Spar Pebble, English Granite, Aberdeen ... Quartz Glass, green Crystal, rock Granite, redEgyptian Granite, Cornish Marble, Egyptian .... Slate Coral Pearl, Oriental Glass, bottle Marble, green Cam- 1 panian J Emerald of Peru Chalk, British Marble, Parian Basalt, Giants Causeway Glass, white. Limestone Asbestos Hornblende White lead Glass, British flint... Diamond, average Beryl, Oriental Garnet, common Topaz, average Sapphire, Oriental.... Garnet, precious Ruby, Oriental Jargon of Ceylon Spar, heavy Loadstone The earth, or mean 1 of the globe J Resins, Gums, &c. Gunpowder, loose 1 heap J Living men Wax Ice Gunpowder, close I shaken J Tallow . Butter Bees-wax Sodium Weight of a Cubic foot in ozs. and lbs. Weight of a j Number of Cubic inch Cubic inches in ozs. I in a lb. 2520 2594 2594 2619 2625 2640 2642 2653 2654 2662 2668 2672 2680 2684 2733 2742 2775 2784 2837 2864 2892 2950 2996 3000 3160 3329 3536 3549 3576 3800 3994 4230 4283 4416 4430 4930 5210 836 891 897 930 937 942 942 956 972 lbs. 157-5000 1621250 162- 1250 163- 6875 164- 0625 165- 0000 165-1250 165-8125 165- 8750 166- 3750 166- 7500 167- 0000 167-5000 167-7500 170- 8125 171- 3750 173- 4375 174- 0000 177-3125 179- 0000 180- 7500 184-3750 187-2500 187-5000 197-5000 208-0625 221-0000 221-8125 223-5000 237-5000 243-3750 264-3750 267-6875 276-0000 276-8750 308-1250 325-6250 52-2500 55-6875 56 0625 58-1250 58-5625 58-8750 58- 8750 59- 7500 60- 7500 1-45833 1-50115 1-50115 1-51562 1-51909 1-52777 1-52893 1-53530 1-53587 1-53935 1-54976 1-54629 1-55092 1-55324 1-58159 1-58735 1-60590 1-61111 1-64178 1-65740 1-67361 1-70717 1-73379 1-73611 1-82870 1- 92650 2- 04629 205381 206944 2-19907 2-25347 2-44791 2-47858 2-55555 2-56365 2- 85300 3- 01504 0-48379 0-51562 0-51909 0-53819 0-54224 0-54513 0-54513 0-55324 0-56250 Cubic ins. 10-9714 10-6584 10-6584 10-5566 10-5325 10-4727 10-4648 10-4214 10-4175 10-3861 10-3628 10-3473 10-3164 10-3010 10-1163 10-0831 9-3632 9-9310 9-7455 9-6536 9-5601 9-3721 9-2283 9-2160 8-7493 8-3052 7-8190 7-7903 7-7315 7-2800 7-1001 6-5361 6-4590 6-2608 6-2410 5-6081 5-3067 33-0717 31-0303 30-8227 29-7293 29-5069 29-3503 29.2993 28-9205 28-4444 89 Of Specific Gravities. HYDRODYNAMICS. The Specific Gravity of Bodies calculated by Avoirdupois Weight.—Continued. Of Specific Gravities. Name of Bodies. Resins, Gums, &c. Camphor Rosin Pitch Opium Gum Arabic Honey Bone of an Ox Bone, dry Phosphorus Alum Gunpowder, solid... Nitre (saltpetre) Ivory Woods. Cork Poplar Larch Fir, North of England Mahogany, Honduras Cedar, American.. Poon Willow Cedar Cypress Elm Pitch Pine Pear-tree Walnut Mar Forest Fir ... Elder-tree Orange-tree Cherry-tree Teak Riga Fir Maple Oak, Dantzic Yew, Dutch ....... Apple-tree Yew, Spanish Ash Beech Oak, Canadian .... Logwood Oak, English Weight of a Cubic foot in ozs. and lbs. 989 1100 1150 1337 1452 1456 1659 1660 1714 1714 1745 1900 1917 240 383 544 556 560 561 579 585 596 598 600 660 661 681 694 695 705 715 745 750 755 760 788 793 807 845 852 872 913 970 lbs. 61-8125 68-7000 71-8750 83-5625 90- 7500 91- 0000 103-6875 103-7500 107-1250 107-1250 109-0625 118- 7500 119- 8125 15-0000 23-9375 34-0000 34- 7500 35- 0000 35- 0625 36- 1875 36- 5625 37- 2500 37-3750 37-5000 41-2500 41- 3125 42- 5625 43- 3750 43- 4375 44- 0625 44-6875 46-5625 46- 8750 47- 1857 47-5000 49-2500 49- 5625 50- 4375 52- 8125 53- 2500 54- 5000 57-0625 60-6250 Weight of a Cubic inch in ozs. Number of Cubic inches in a lb. 0-56655 0-63657 0-66550 0-77372 0-84027 0-84259 0-96006 0-96064 0-99184 0-99184 1-00983 1 09953 1-10937 0 13888 0-22164 0-31481 0-32175 0-32407 0-32465 0-33506 0-33854 0-34490 0-34664 0-34722 0-38194 0-38252 0-39467 0-40162 0-40219 0-40798 0-41377 0-43113 0-43402 0-43692 0-43981 0-45590 0-45891 0-46701 0-48900 0-49305 0-50694 0-53125 0-56134 Cubic ins. 27-9555 25-0909 24-0417 20-6791 19-0413 18-9890 16-6654 16-6554 16-1307 161307 15-8441 14-5515 14-4422 115-2000 71-7660 50-8235 497266 49-3714 49-2833 47-7512 47-2615 46-3892 46-2341 46-0800 41-8909 41-8275 40-5991 39-8386 39-7812 39-2170 38-6685 371114 36-8640 36-6198 36-3789 35-0862 34-8656 34-2602 32-7195 32-4507 31-7064 30-2825 28-5030 Name of Bodies. Woods. Box, French Brazil Wood, red Mahogany, Spanish... Oak, English, 60 years old Ebony, American .... Lignum-vitae Liquids. Ether, sulphuric Alcohol, absolute.. Brandy Bitumen, liquid... Turpentine, oil of.... Ether, muriatic... Olive oil Moselle wine Whale oil Proof spirit Linseed oil Castor oil Wine, red Port.... Wine of Burgundy... Wine of Bordeaux .. Wine, white Cham-1 PaSne I Water, distilled Tar Vinegar Sea-water Milk Ale, the average of.. Blood, human Muriatic acid of) commerce J Aqua regia Water of the Dead 1 Sea / Nitrous acid Nitric acid,or aqua- 1 fortis J Boracic acid Sulphuric acid Quicksilver. (See the metals.) Weight of a Cubic foot in ozs. and lbs. Weight of a Cubic inch 1030 1031 1063 1170 1331 1333 720 796 837 848 870 874 915 916 923 930 940 970 990 991 994 997 1000 1015 1026 1028 1030 1035 1045 1218 1234 1240 1452 1500 1830 1848 lbs. 64-3750 64-3125 66-4250 73-1250 83-1875 83-3125 45-0000 49-7500 52-3125 530000 54-3750 54-6250 57-1875 57-2500 57- 6875 58- 1250 58-7500 60- 6250 61- 8750 61- 9375 62- 1250 62-3125 62- 5000 63- 4375 64- 1250 64-2500 64-3750 64- 6875 65- 3125 76- 1250 77- 1250 77-5000 90-7500 93-7500 114-3750 1280000 Number of Cubic inches in a lb, 0-59606 0-59664 0-61516 0-67708 0-77025 0-77141 0-41666 0-46064 0-48437 0-49074 0-50347 0-50578 0-52951 0-53009 0-53414 0-53819 0-54398 0-56134 0-57291 0-57349 0-57523 0-57696 0-57870 0-58738 0-59375 0-59490 0-59606 0-59895 0-60474 0-70486 0-71412 0-71759 0-84024 C-86805 1-05902 1-06944 Cubic ins. 26-8427 26-8680 26-0143 23-6307 20-7723 20-7411 38-4000 34-7487 33-0322 32-6037 31-9632 31-6338 30-2163 30 1834 29-9544 29-7290 29-4127 28-5030 27-9272 27-8990 27-8148 27-7311 27-6480 27-2396 26-9473 26-8949 26-8427 26-7130 26-4574 22-6995 22-4051 22-2580 19-0082 18-4000 15-1081 13-5000 Name of Bodies. Gases. Hydrogen Ammonia Nitrogen Olefiant Atmospheric air Nitrous Oxygen Muriatic acid .. Carbonic acid .. Cyanogen Sulphurous acid Chlorine Fluosilicic acid.. Hydriodic acid.. Weight of a Cubic Foot in ozs. and lbs. 0-069 0-590 0-972 0-982 1-000 1-042 1-111 1-280 1-524 1- 805 2- 222 2- 444 3- 611 4- 300 lbs. •0043125 •0368750 •0607500 •0613750 •0625000 •0651250 •0694375 •0800000 •0952500 •1128125 •1388750 •1527500 •2256875 •2687500 Weight of a Cu¬ bic inch in ozs. •0000399 •0003414 •0005625 •0005682 •0005787 •0006030 •0006429 •0007407 •0008819 •0010445 •0012858 •0014143 •0020896 •0024884 Number of Cubic inches in a lb. Cubic ins. 400695-6 46861-0 28444-4 28154-7 27648-0 26533-5 24885-6 21600-0 18141-7 15317-4 12442-8 11312-6 7656-6 6429-7 Number of Cubic feet in a lb. Cubic feet. 231-8840 27-1186 16-4609 16-2932 160000 15-3550 14-4014 12-5000 10-4986 8-8642 7-2007 6-5466 4-4309 3-7209 YOL. XII. M HYDRODYNAMICS. 90 Capillary Attraction, &c. CHAPTER III.—ON CAPILLARY ATTRACTION AND THE COHESION OF FLUIDS. Capillary Attraction, &c. 114. We have already seen, when discussing the equili¬ brium of fluids, that when water or any other fluid is poured into a vessel, or any number of communicating vessels, its surface will be horizontal, or it will rise to the same height in each vessel, whatever be its form or position. This pro¬ position, however, only holds true when the diameter of these vessels or tubes exceeds the fifteenth of an inch: for if a system of communicating vessels be composed of tubes of various diameters, the fluid will rise to a level surface in all the tubes which exceed one fifteenth of an inch in dia¬ meter ; but in the tubes of a smaller bore, it will rise above that level to altitudes inversely proportional to the dia¬ meters of the tubes. The power by which the fluid is raised above its natural level is called capillary attraction, and the glass tubes which are employed to exhibit its phe¬ nomena are named capillary tubes. These appellations derive their origin from the Latin word capillus, signifying a hair, because the bores of these tubes have the fineness of a hair. 115. When we bring a piece of clean glass in contact with water or any other fluid, except mercury and fused metals, and withdraw it gently from its surface, a portion of the fluid will not only adhere to the glass, but a small force is necessary to detach this glass from the fluid mass, which resists any separation of its parts. Hence it is ob¬ vious that there is an attraction of cohesion between glass and water, and that the constituent particles of water have also an attraction for each other. The suspension of a drop of water from the lower side of a plate of glass is a more palpable illustration of the first of these truths; and the following experiment will completely verify the second. Place two large drops of water on a smooth metallic surface, their distance being about the tenth of an inch. With the point of a pin unite these drops by two parallel canals, and the drops will instantly rush to each other through these canals, and fill the dry space that intervenes. This expe¬ riment shows that in capillary attraction there enters an at¬ tractive as well as a cohesive force. 116. Upon these principles many attempts have been made to account for the elevation of water in capillary tubes; but most of the explanations which have hitherto been offered, are founded upon hypothesis, and are very far from being satisfactory. Without presuming to substi¬ tute a better explanation in the room of those which have been already given, and so frequently repeated, we shall endeavour to illustrate that explanation of the phenomena of capillary attraction wdiich seems liable to the fewest ob¬ jections. For this purpose let a drop of water be laid upon a horizontal glass plate. Every particle of the glass immediately below that drop exerts an attractive force upon the particles of water. This force will produce the same effect upon the drop as a pressure in the opposite direction ; the pressure of a column of air, for instance, on the upper surface of the drop. The effect of the attractive force, therefore, tending to press the drop to the glass will be an enlarge¬ ment of its size, and the water will occupy a larger space; this increase of its dimen¬ sions will take place when the surface AB is held downwards; and that it does not arise from atmospheric pressure may be shown by performing the experiment in vacuo. Now, let AB (fig. 22) be a section of a plate of glass, which is held vertically, part of the water will de- Fig. 22. scend by its gravity, and form a drop B, wdiile a small film of the fluid will be supported at m by the attraction of the glass. Bring a similar plate of glass CD, into a position parallel to AB. and make them approach nearer and nearer each other. When the drops B and D come in contact, they will rush together ifom their mutual attraction, and will fill the space op. The gravity of the drops B and D being thus diminished, the films of water at m and n, which were prevented from rising by their gravity, will move upwards. As the plates of glass continue to approximate, the space between them will fill with water, and the films at m and n being no longer prevented from yielding to the action of the glass immediately below them (by the gravity of the water at op, which is diminished by the mutual action of the fluid particles), will rise higher in proportion to the ap¬ proach of the plates. Hence it may be easily understood how the water rises in capillary tubes, and how its alti¬ tude is inversely as their internal diameters. For let A, a be the altitudes of the fluid in two tubes of different dia¬ meters, D, d', and let C,c be the two cylinders of fluid which are raised by virtue of the attraction of the glass. Now, as the force which raises the fluid must be as the number of attracting particles, that is, as the surface of the tube in contact with the water, that is, as the diameter of the tubes; and as this same force must be proportional to its effects on the cylinder of water raised, we shall have D : d=C : c. But (Geometry, sect, viii., theor. xi. ; sect, ix., theor. ii.) C : e = D2A : or’ DA = rfa, that is, D : d—a: A ; or the altitudes of the water are inversely as the diameters of the tubes. Since DA = c?a, the product of the diameter by the altitude of the water will always be a constant quantity. In a tube whose diameter is OOl, or 100th of an inch, the water has been found to reach the altitude of 5-3 inches; hence the constant quantity 5'3 x 0T=0'053 may fitly represent the attraction of glass for water. According to the experiments of Muschen- broek, the constant quantity is 0-039; according to Weit- brecht, 0,0428 ; according to Monge, 0f042 ; and according to Atwood, O'OSSO. When a glass tube was immersed in melted lead, Gellert found the depression multiplied by the bore to be 0’0054. 117. Having thus attempted to explain the causes of capillary action, we shall now proceed to consider some of its more interesting phenomena. In fig. 23, MN is a ves¬ sel of water in which tubes of various forms are immersed. The water will rise in the tubes A, B, C, to different alti¬ tudes, m, n, 0, inversely proportional to their diameters. If the tube B is broken at a, the water will not rise to the very top of it at a, but will stand at b, a little below the HYDRODYNAMICS. 91 Capillary top, whatever be the length of the tube, or the diameter of Attraction, its bore. If the tube be taken from the fluid and laid in a &c- horizontal position, the water will recede Irom the end that was immersed. 118. If a tube D, composed of two cylindrical tubes of different bores, be immersed in water with the widest part downwards, the water will rise to the altitur'e/>, and if an¬ other tube E of the same size and form be plunged in the fluid with the smaller end downwards, the water will rise to the same height q as it did in the tube D. This experi¬ ment seems to be a complete refutation of the opinion of Dr Jurin, that the water is raised by the action of the an¬ nulus of glass above the fluid column ; for since the annu¬ lar surface is the same at q as at p, the same quantity of fluid ought to be supported in both tubes, whereas the tube E evidently raises much less water than D. But if we ad¬ mit the supposition in art. 116, that the fluid is supported by the whole surface of glass in contact with the water, the phenomenon receives a complete explanation ; for since the surface of glass in contact with the fluid in the tube E is much less than the surface in contact with it in the tube D, the quantity of fluid sustained in the former ought to be much less than the quantity supported in the latter. 119. When a vessel, Yvtv (fig. 23), is plunged in water, and the lower part, tumv, filled by suction till the fluid enter the part Ftf, the water will rise to the same height as it does in the capillary tube G, whose bore is equal to the bore of the part F£. In this experiment the portions of water tvx and uxw on each side of the column Fa? are sup¬ ported by the pressure of the atmosphere on the surface of the water in the vessel MN ; for if this vessel be placed in the exhausted receiver of an air-pump, these portions of water will not be sustained. 120. The preceding experiment completely overturns the hypothesis of Dr Hamilton and Dr Matthew Young, that the fluid was sustained in the tube by the lower ring of glass contiguous to the bottom of the tube, that this ring raises the portion of water immediately below it, and then other portions successively till the portion of water thus raised be in equilibrium with the attraction of the annulus in question. 121. Various experiments on the ascent of fluids in ca¬ pillary tubes have been made by MM. Weitbrecht, Gel- lert, Lord Charles Cavendish, MM. Haiiy and Tremery, Sir David Brewster, and M. Gay Lussac. The following are the results obtained by M. Weitbrecht in the ascent of water :— Diameter of the tube Height of ascent Constant in English inches. in inches. quantity. 0-065 0-72 0-0432 0-045 0-95 0-0427 0-08 0-53 00424 0-025 1-72 0-043 Mean 0-04282 122. The most accurate experiments on the depression of mercury in capillary tubes are those made by Lord Charles Cavendish:— Interior diameter of tube. 0-6 inches. 0-5 0-4 0-3 0-2 0-1 Mercury in one inch of tube. 972 grains. 675 432 243 108 27 Depression of the mercury. 0-005 inches. 0-007 0-015 0-036 0-067 0-140 The constant quantity deduced by Dr Thomas Young from the preceding experiments is OOlo. 123. The very great discrepancy in the preceding results, obtained by very accurate and skilful observers, induced Sir David Brewster to repeat the experiments with an instru¬ ment constructed for the purpose, and to take such precau¬ tions, that he could always obtain the same results after re¬ peated trials. Having obtained a glass tube 7'9 inches long, and of a Capillary uniform circular bore, he took a wire of a less diameter Attraction, than the bore of the tube, and formed a small hook at one &c- of its ends. This hook was fastened to the middle of a v-—' worsted thread, of such a size as, when doubled, to fill the bore of the tube. The wire was then passed through the tube, and the worsted thread drawn after it; and when the whole was plunged in an alkaline solution, the worsted thread was fixed at one end, and the tube was drawn back¬ wards and forwards till it was completely deprived, by its friction on the thread, of any grease or foreign matter which might have adhered to it. The tube and thread were then taken to clean water, and the same operation was repeated. When the tube was thus perfectly cleaned, it was fixed vertically, by means of a level, in the axis of a piece of wood D (fig. 24), supported by the arm AD, fixed upon Fig. 24. Fig. 25. a stand AB ; and it was also furnished with an index mn, which was moveable to and from the extremity b. On the arm CE, moveable in a vertical direction by the nut C, was placed a glass vessel F, containing the fluid, and nearly filled with it. The nut C was then turned till the extremi¬ ty b of the tube touched the surface of the fluid, which was indicated by the sudden rise of the liquor round its sides. The fluid then rose in the tube till it remained stationary, and the index mn was moved till its extremity n pointed out the exact position of the upper surface of the fluid. In this situation, the distance nb was a measure of the ascent of the liquid above its level in the vessel F. In order to ascertain, however, whether the fluid was stationary, in consequence of any obstruction in the tube, or of an equi¬ librium of the attracting forces, the vessel with the fluid was raised a little higher than its former position, by means of the nut C, and then depressed below it. If the fluid now rose a little above n, and afterwards sunk a little below it, so as always to rise and fall with facility and uniformity along with the surface of the fluid in the vessel, it was ob¬ vious that it suffered no obstruction in the tube, and that nb was the accurate measure of its height. By separating the extremity b of the tube from the surface of the fluid, the fluid always rises above n; but upon again bringing them into contact, the fluid resumes its position at n. If there should be any portion of fluid at the end b of the tube, when it is again brought in contact with the fluid surface the water would rise around it before it had reached the 92 hydrodynamics. Capillary general level, and therefore the height of the fluid ob- Attraction, tained by measuring from the end of the tube would be too &c- small. ^m~> In order to avoid this source of error, the index should have a projecting arm mn (fig. 25), carrying a screw st, whose sharp point t can be easily brought on a level with the end b of the tube. When the extremity t, therefore, which can always be kept dry, comes in contact with the fluid surface PQ, the extremity b must also be exactly on the same level, even though the fluid had already risen around it. The tube was then cleaned, as formerly, for a subsequent observation. The results which were thus ob¬ tained for a great variety of fluids, and with a tube 0-0561 of an inch in diameter, are given in the following table:— Names of Fluids. Height of ascent Constant in inches. quantity. Experiments with Water. Diameter of the tube. 1-29441 millim. 1-90381 Height of ascent above lowest point of concavity. 23-1634 millim. 15-5861 Temp, of fluid. Centigrade. 8°-5 Capillary Attraction, &c. The constant quantity in English inches, as deduced from these two experiments, is 0-04622. Experiments with Alcohol. Diameter of the tube. 1-29441 millim. 1-90381 1-29441 1-29441 3 10-508 Height of ascent above lowest point of concavity. 9-18235 millim. 6-08397 9-30079 9-99727 0-3835 Density of alcohol. 0-81961 0-81961 0-8595 0-94153 0-81347 Water 0-587 Very hot water 0-537 Muriatic acid 0-442 Oil of boxwood 0-427 5 Oil of cassia 0-420 Nitrous acid 0-413 Oil of rapeseed 0-404 Castor oil 0-403 Nitric acid 0-395 10 Oil of spermaceti 0-392 Oil of almonds 0-387 Oil of olives 0-387 Balsam of Peru 0"377 Muriate of antimony 0-373 15 Oil of rhodium 0-366 Oil of pimento 0-361 Cajeput oil 0-357 Balsam of capivi 0-357 Oil of pennyroyal 0-355 20 Oil of thyme 0-354 Oil of bricks distilled ) n-asa from spermaceti oil / Oil of caraway seeds 0-353 Oil of rhue 0-353 Oil of spearmint 0-351 25 Balsam of sulphur 0-349 Oil of sweet fennel seeds 0-349 Oil of hyssop 0-349 Oil of rosemary 0-344 Oil of bergamot 0"343 30 Oil of amber 0-343 Oil of anise seeds 0-342 Oil of Barbadoes tar 0-341 Laudanum 0-340 Oil of cloves 0-334 35 Oil of turpentine 0 333 Oil of lemon 0-333 Oil of lavender 0-328 Oil of camomile 0-327 Oil of peppermint 0-327 40 Oil of sassafras 0-327 Highland whisky 0-327 Brandy 0-326 Oil of wormwood 0-326 Oil of dill seed 0-324 45 Oil of ambergrease 0-323 Genuine oil of juniper 0-321 Oil of nutmeg 0‘320 Alcohol1 0-317 Oil of savine 0-310 50 ./Ether 0-285 Oil of wine 0-273 Sulphuric acid 0-200 00327 00301 0-0248 0-0240 0-0236 00232 0-0227 0-0226 0-0222 0-0220 0-0217 0-0215 0-0212 0-0209 0-0205 0-0203 0-0200 0-0200 00199 00199 00199 0-0198 0-0198 0-0197 0-0196 0-0195 0-0195 0-0193 0-0192 0-0192 0-0192 0-0191 0-0191 00187 00187 00187 0-0184 0-0184 0-0184 0-0184 0-0184 0-0183 0-0183 0-0182 0-0181 0 0180 0-0180 0-0178 0-0174 0-0160 0-0153 0-0112 124. By means of an instrument similar in principle to the one above described,2 M. Gay Lussac made a series of accurate experiments on the ascent of water and alcohol in capillary tubes. In these experiments the tubes were well wetted with the fluid. The temperature of the alcohol was 8°-5 centig., and the constant quantity for the two first experiments, reduced to English inches, is 0 01815, which agrees remarkably with 0'0178, the constant quantity in Sir David Brewster’s ex¬ periments. Experiments ivith Oil of Turpentine. Diameter of tube. Height of fluid. Density. 1-29441 millim. 9-95159 0-869458 This result also coincides very nearly with that of Sir David Brewster. 125. The following table contains a general view of the results obtained by different philosophers, from the ascent of water in capillary tubes. Names of observers. Constant quantity, in English inches. Sir Isaac Newton,4 0-020 MM. Haiiy and Tremery 0-021 M. Carre, mean of three observations 0-022 M. Hallstrom 0"026 Sir David Brewster 0 033 Muschenbroek 0-039 M. Weitbrecht, average of his results 0-042 M. Gay Lussac, average of two observations... 0-046 Benjamin Martin 0-048 Mr Atwood 0-053 James Bernouilli 0-064 Throwing aside the measure of James Bernouilli as ob¬ viously erroneous, we obtain 0-035 as the general average result of the preceding means; but the difference between this and the extreme measures of Newton and Atwood is so great, that there must be some cause, different from an error of observation, to which it is owing. The difference between the results obtained by Sir David Brewster and M. Gay Lussac, made with nice instruments founded on the same principle, leads to the same conclusion. Laplace indeed has ascribed, and we think justly, these differences to the greater or less degree of humidity on the sides of the tubes; and he informs us that Gay Lussac made his ex¬ periments with tubes very much ivetted. Here, then, we have at once the cause of the difference above mentioned, because the experiments of Sir David Brewster were made with a tube carefully cleaned and dried after each experi¬ ment. A dry tube must necessarily raise the water to a less height than a wet one, and the difference must increase as the diameter of the tube employed is diminished. If we conceive a tube, indeed, with an exceedingly small bore, wetted over the whole of its interior, in the slightest degree, the two inner surfaces of the film would nearly meet in the axis, and the height of ascent would be infinite, or as high as the tube was long. 1 L>r Young found the height of ascent of water and diluted spirit of wine to be as 100 to 64. 2 See Biot’s Traite de Physique. 3 This is a mean of five experiments. 4 Optics, p. 366, 3d edition. Capillary 126. From these observations, the reader will be already Attraction, prepared to draw the conclusion, that the ascent of fluids in &c> glass tubes is a very equivocal measure of the force of ca- pillary attraction, independent of its being applicable only to the single substance of glass. With the view of removing this objection, Sir David Brewster long ago constructed an instrument, tbe object of which was to measure, upon an optical principle, the dia¬ meter of the circle of fluid which any cylindrical solid raises by capillary attraction above its general level. Thus, let MN (fig. 26) be the plan of a vessel filled with fluid, and A the section of a vertical cylinder of well cleaned and well dried glass, or any other substance not porous. This solid, A, will raise the fluid to a certain height around it, elevating a circular portion, CD, of the fluid above the general level; and it is manifest that the diameter CD of this elevated portion will be proportioned to the height of the fluid round the sides of the cylinder, or to the capillary force by which it is raised. In order to measure the diameter of this circle of fluid, a mi¬ crometer carries a small vertical frame along the M edge FG of the vessel. HYDRODYNAMICS. 93 distance by another piece of wax W, so that their interior Capillary surfaces, whose common intersection is the line Eh, may Attraction, form a small angle. When this apparatus is immersed in a vessel, MN, full of water, the fluid will rise in such a manner between the glass planes as to form the curve Y)qom¥, which represents the surface of the elevated water. By measuring the ordinates mn, op, &c., of this curve, and also its abscissae Era, Ejo, &c., Mr Hawksbee found it to be the common Apollonian hyperbola, having for its assymp- totes the surface DE of the fluid, and EF the common in¬ tersection of the two planes. The following are the re- A Fie:. 26. Along this frame are stretched two fine paral¬ lel wires, whose images can be seen by reflection from the surface of the fluid, by an eye on the side PQ of the vessel, aided by a microscope with a distant focus. When the image of these wires is seen by reflection from any part of the fluid surface without the circle CD, it will suffer no change of form ; but when it is seen by reflection from any portion of the elevated por¬ tion CD, the fibres will appear disturbed, and will indicate, by their return to the rectilineal form of accurate parallelism, the apparent termination of the circle CD. The same ob¬ servation is made on the other side of A, at the boundary D, and a measure is thus obtained of the diameter of the circle CD, by means of the micrometer screw, by which the microscope on the side PQ, and the wire frame on the side FG, are moved (being fixed to the same frame) along the sides of the vessel. In this way solids of all kinds may be used, and their exterior or acting surfaces may be easily cleared from grease and other adhering substances. This apparatus may be improved by using two cylinders, A, B, in place of one, and by moving one of them, suppose B, from the other, A, till the two elevated circular portions CD, DE disturb the images of the wires, seen by reflection from the intermediate point at D. A telescope may be ad¬ vantageously used to observe the disturbance of any image seen reflected from the fluid surface. 127. When water is made to pass through a capillary tube of such a bore that the fluid is discharged only by suc¬ cessive drops, the tube, when electrified, will furnish a constant and accelerated stream, and the acceleration is proportional to the smallness of the bore. A similar effect may be produced by employing warm water. Sir John Leslie found that a jet of warm water rose to a much greater height than a jet of cold water, though the water in both cases moved through the same aperture, and was influenced by the same pressure. A siphon also, which discharged cold water only by drops, furnished warm water in an un¬ interrupted stream. 128. Such are the leading phenomena of capillary tubes. The rise of fluids between two plates of glass remains to be considered ; and while it furnishes us with a very beautiful experiment, it confirms the reasoning by which we have accounted for the elevation of fluids in cylindrical canals. Let ABEF and CDEF (fig. 27) be two planes of plate glass with smooth and clean surfaces, having their sides EF joined together with wax, and their sides AB, CD kept at a little suits which he obtained when the inclination of the planes was 20':— Distances from the touching ends of the planes. 13 inches 9 7 5 3 If U ... •i 1 Heights of the water at the preceding distances. 1 2 3 5 9 12 18 271 35 50 76 By repeating these observations at inclinations of 40', and at various other angles, Mr Hawksbee found that the curve was an exact hyperbola in all directions of the planes. To the very same conclusion we are led by the principles already laid down ; for as the distance between the plates diminishes at every point of the curve DqomF from D towards F, the water ought to rise higher at o than at q, still higher at m, and highest of all at F, where the distance between the plates is a minimum. To illustrate this more clearly, let ABEF and CDEF (fig. 28) be the same plates of glass (in¬ clined at a greater angle for the sake of distinctness), and let FmqD, and FosB be the curves which bound the sur¬ face of the elevated fluid. Then, since the altitudes of the water in capillary tubes are inversely as their diameters, or the distances of their op¬ posite sides, the altitudes of the water between two glass plates should at any given point be inversely as the distances of the plates at that point. Now, the dis¬ tance of the plates at the point m is obviously mo, or its equal ra/?,and the distance at q is qs or rt; and since ram is the altitude of the water at m, and qr its altitude at Fig. 28. q, we have mn : qr=rt: np ; but (Geometry, Sect. IV. 94 HYDRODYNAMICS. Capillary Theor. xvii.) Ew: YuT=np : rt; therefore mn: qr = \^,r: E«, Attracticn, tliat is, the altitudes of the fluid at the points m, q, which &c- are equal to the abscissae Ew, Er (fijt. 27), are proportional to the ordinates qr, mn, equal to the abscissae Er, Era, in fin llg-ol- are brought close to its periphery, their attractive force upon the mercurial particles is not sufficient to counteract the mutual attraction of these particles ; the mercury, therefore, retains its convexity at the circumference, and assumes the form exhibited in fig. 32. The small spaces o, p (fig. 30) being filled by the pressure of the superincumbent fluid, while the spaces below m, n still re¬ main between the glass and the mer¬ cury. Now if the two plates of glass A, B be made to ap¬ proach each other, the depressions rag ra will still continue, and when the distance of the plates is so small that these depressions or indentations meet, the mercury will sink be¬ tween the plates, and its descent will continue as the pieces of glass approach. Hence the depression ol the mercury in capillary tubes becomes very intelligible. If two glass planes forming a small angle, as in fig. 27, be immersed in a vessel of mercury, the fluid will sink below the surface of the mercury in the vessel, and form an Apollonian hyper¬ bola like DoF, having for its asymptotes the common in¬ tersection of the planes and the surface of mercury in the vessel. 132. The depression of mercury in capillary tubes is evidently owing to the greater attraction which the par¬ ticles of mercury have for each other than for glass. The difference between these two attractions, however, arises from an imperfect contact between the mercury and the capillary tube, occasioned by the interposition of a thin coating of water which generally lines the interior surface of the tube, and weakens the mutual action of the glass and^ mercury ; for this action always increases as the thickness of the interposed film is diminished by boiling. In the experi¬ ments which were made by Laplace and Lavoisier on baro¬ meters, by boiling the mercury in them for a long time, the convexity of the interior surface of the mercury was often made to disappear. They even succeeded in render¬ ing it concave, but could always restore the convexity by introducing a drop of water into the tube. When the ebulli¬ tion of the mercury is sufficiently strong to expel all foreign particles, it often rises to the level of the surrounding fluid, and the depression is even converted into an elevation.. 133. Between mercury and water there is likely to b.i some fluid in which the attraction of the glass for its parti¬ cles is nearly equal to half the attraction of the fluid lor itself. Sir David Brewster has observed that iodine dis¬ solved in chloride of sulphur approximates to this condition; but not having the chloride by itself, he could not observe whether or not the effect is produced or influenced by the HYDRODYNAMICS. 95 Capillary iodine. If it is, then a solution may be obtained in which Attraction, the above condition is perfect. The solution of the iodine &c- already mentioned scarcely rises on the sides of the glass ^ ball which contains it. 134. As most philosophers seem to agree in thinking that all the capillary phenomena are referable to the cohesive attraction of the superficial particles only of the fluid, a va¬ riety of experiments has been made in order to determine the force required to raise a horizontal solid surface from the surface of a fluid. Mr Achard found that a disc of glass, 1^ French inches in diameter, required a weight of 91 French grains to raise it from the surface of the water at 69° of Fah¬ renheit, which is only 37 English grains for each square inch. At 44^° of Fahrenheit the force was j^th greater, or 39^ grains, the difference being Tig for each degree of Fahren¬ heit. From these experiments Dr Young concludes that the height of ascent in a tube of a given bore, which varies in the duplicate ratio of the height of adhesion, is diminished about y^th for every degree of Fahrenheit that the tempera¬ ture is raised above 50° ; and he conjectures that there must have been some considerable source of error in Ach- ard’s experiments, as he never found this diminution to ex¬ ceed 135. According to the experiments of Morveau, the force necessary to elevate a circular inch of gold from the surface of mercury is 446 grains; a circular inch of silver, 429 grains ; a circular inch of tin, 418 grains; a circular inch of lead, 397 grains ; a circular inch of bismuth, 372 grains ; a circular inch of zinc, 204 grains; a circular inch of copper, 142 grains; acircular inch of metallic antimony, 126 grains ; a circular inch of iron, 115 grains ; and a similar surface of co¬ balt required 8 grains. The order in which these metals are arranged is the very order in which they are most easily amalgamated with mercury. The most recent experiments on the adhesion of surfaces to fluids have been made by M. Gay Lussac, who obtained the following results with a circular plate of glass 118’366 millimetres in diameter:— Weight necessary to Names of fluids. raise the plate .from Specific gravity, the glass. Water 59'40 grammes. I’OOO Alcohol 31-08 ... 0-8196 Alcohol 32'87 ... 0'8595 Oil of turpentine 37,152 ... 0‘9415 With a copper disc, 116-604 millimetres in diameter, the weight necessary to raise it from water, at the temperature of 180-5 centigrade, was 57*945 grammes, differing very little, if at all, from glass ; for the diminution of weight may be explained by the circumstance of the copper disc being nearly tivo millimetres less in diameter than the glass. In these experiments the discs were suspended from the scale of a balance, and the weights in the other scale successively increased till the force of adhesion was overcome at the in¬ stant when the disc detached itself from the fluid surface. 136. The approach of two floating bodies has been as¬ cribed by some to their mutual attraction, and by others to the attraction of the portions of fluid that are raised round each by the attraction of cohesion. Dr Young, however, observes, that the approach of the two floating bodies is produced by the excess of the atmospheric pressure on the remote sides of the solids, above its pressure on their neigh¬ bouring sides; or, if the experiments are performed in a vacuum, by the equivalent hydrostatic pressure or suction derived from the weight and immediate cohesion ot the in¬ tervening fluid. This force varies alternately in the inverse ratio of the square of the distance ; for when the two bodies approach each other, the altitude of the fluid betw een them is increased in the simple inverse ratio of the distance ; and the mean action, or the negative pressure of the fluid on each particle of the surface, is also increased in the same ratio. When the floating bodies are sui’rounded by a de¬ pression, the same law prevails, and its demonstration is still more simple and obvious. 137. A different view of the subject has been given by Monge, who made a number of accurate experiments on the subject, and deduced from them the following laws : 1^. If two floating bodies, capable of being wetted with the fluid on which they float, are placed near each other, they will approach as if mutually attracted. In order to explain this law, let AB, CD (fig. 33) be two suspended plates of glass, placed at such distance that the Capillary Attraction, &c. point H, where the two portions of elevated fluid meet, is on a level with the rest of the water, the two plates w ill remain stationary and in perfect equilibrium. But if they are brought nearer one another, as in fig. 34, the water will rise between them to a point H above the level, and by a nearer approximation, to the point G. The water thus ele¬ vated, acting like a curved chain hung to the two plates, attracts the sides of the plates, and brings them together in a horizontal direction. The very same thing takes place with the floating bodies A, B, placed at such a distance that the water rises be¬ tween them above its level, and hence these bodies will approach by the attraction of the fluid on their inner sides. 2d. When the two floating bodies A, B (fig. 36), are not capable of being wetted, they will approach each other as if mutually attrac¬ ted, when they are placed near one another. Fis-36- In this case the fluid is depressed between them below its natural level H, and the two bodies are pressed inwards or towards each other, which pressure being greater than the pressure outivards of the fluid between them, they will approach each other by the action of the difference of these pressures. 3d If one of the bodies, A, is capable of being wetted, and the other, B, not, as shown in the fig. 37, they wall recede from each other as if mu¬ tually repelled. As the fluid rises round A, and is depressed round B, the depression round B will not be equal all round, and hence the body B, being placed as if on an inclined plane, will move to the right hand where the pressure is the least. In this last case, Laplace was led by theory to believe A B Fig. 37. A B Fig. 35. 96 HYDRODYNAMICS. Capillary that when 13 is placed very near A, the repulsion will be Attraction, converted into attraction. M. Haiiy tried this experiment &c- with planes of ivory and talc, the former being incapable of being wetted witli water and the latter not; and he found, in conformity with Laplace’s prediction, that at a certain short distance the talc moved suddenly into contact with the ivory. 138. The phenomena of attraction and repulsion exhi¬ bited between small lighted wicks, swimming in a basin of oil, and the motions of floating evaporable substances like camphor, and also of potassium and light substances, such as cork, impregnated with ether, have been sometimes treated under this head. The first of these classes of phe¬ nomena arise from an unbalanced pressure upon the float¬ ing wick, arising from a difference of temperature of dif¬ ferent parts of the oil; and the movements of the second class arise from the reaction of the currents of vapour which flow from the floating substances. A full account of these phenomena will be found in the Edinburgh Trans¬ actions (vol. iv., p. 44), in the Memoires 'presentees d ITn- stitut (tom. i., p. 125), and the more recent observations of Matteucci, in the Annales de Chimie (June 1833, tom. liii., p. 216-219). Theory of Capillary Attraction. 139. Dr Hook was one of the earliest speculators in ca¬ pillary attraction. He believed that the phenomena were due to a diminution of pressure within the tube by reason of friction against its inner surface. Hawksbee, by means of the air-pump, showed that this was erroneous. Hawks¬ bee was the first who made an approximation to the true theory of capillarity, by ascribing it to the attraction of the tube or plate. Dr Jurin corrected one of Hawksbee’s ex¬ periments, together with its explanation. Newton also seems to have been in some measure acquainted wuth capillary at¬ traction, if we may judge from the 31st query of the last edition of his Optics. But before Clairaut took up the subject, the prevalent theories on capillarity were defective in two respects ; they contained no calculation founded on the hypothesis of an attraction, sensible only at insensible distances from the attracting centres, although Newton had then shown the existence of such forces ; and no account of the cohesive attraction of the parts of the fluid for each other were recognised. Clairaut, then, was the first to see the necessity of taking into account the action of the fluid on itself; he was the first mathematician who attempted to analyze the forces which contribute to the ascent of fluids in capillary tubes.1 After pointing out the insufficiency of preceding theories, he gives an analysis of the different forces which contribute to the suspension of fluids in ca¬ pillary tubes. Mg. 38. Let ABCDEFGH (fig. 38) be the section of a capillary tube, MNP the surface of the water in the vessel, li the height of its ascent, viz., the concave surface of the fluid column, and IKLM an indefinitely small column of fluid reaching to the surface at M. Now the column ML is so¬ licited by the force of gravity which acts through the whole extent of the column, and by the reciprocal attraction of the moleculae, which, though they act the same in all the points of the column, only exhibit their effects towards the extremity M. If any particle e is taken at a less distance from the surface than the distance at which the attraction of the liquid generally terminates, and if mn is a plane pa¬ rallel to MN, and at the same distance from the particle e, then this particle will be equally attracted by the water be¬ tween the planes MN, mn. The water, however, below mn, will attract the particle downwards, and this effect will take place as far as the distance where the attraction ceases. The column IK, on the other hand, which is in a state Capillary of equilibrium with ML, is acted upon by the force of gra- Attraction, vity through the whole extent of the column, also by other &c< forces at the upper and lower extremities of the tube. The forces exerted at the upper part of the column are, the at- Fig. 38. traction of the tube upon the particles of water, and the reciprocal attraction of these particles ; but as every particle is as much drawn upwards as downwards by the first of these forces, the consideration of it may be dropped. In order to estimate the other force, let a horizontal plane, VX, touch the concavity at I, a particle p, situated infinitely near to I, is attracted by all the particles above VX, and by all below it whose sphere of activity comprehends that particle; and as the particles above p are fewer than those below it, the result of these forces must be a force acting downwards. In order to estimate the value of the forces which act at the lower end O of the tube, let us suppose that the tube has a prolongation to the bottom of the vessel, formed of matter of the same density as the water. Let a particle R, be situated a little above the extremity of the tube, and another Q, as much below that extremity, they will be equally acted upon by the water above that plane, and by the water between the fictitious prolongation of the tube, and therefore these forces will destroy one another. By applying to the case of the particle R the same rea¬ soning that was used for the particle e, it will appear that the result of its attraction by the tube is an attraction up¬ wards. The particle R is likewise attracted downwards by the supposed prolongation of the tube, and the difference between these is the real effect. The other particle Q is also drawn upwards by the tube with the same force as R, since, by the hypothesis, it is as far distant from the points D, G, as the particle R is from the points d, g, where, with re¬ spect to it, the real attraction of the tube commences. The particle Q is attracted also downwards, by the supposed prolongation of the tube, and the difference of these actions is the real effect. Hence the double of this force is the sum of all the forces that act at the lower part of the tube. These forces, when combined with those exerted at the top of the tube, and with the force of gravity, give the total expression, which should be combined with that of the forces with which the column ML is actuated. The formula obtained by Clairaut for the altitude \i (fig. 38) is \i= (2Q Q) ^J^dx \J->. xj tA [*’ P in which Q is the intensity of the attraction of the glass, Q' the intensity of the attraction of the water, b the interior radius of the tube, and p the force of gravity. Clairaut then observes, that there is an infinitude of pos- 1 Thfrorie de la Figure de la Terre, chap. x. Paris, 1743, 1808. HYDRODYNAMICS. 97 &c. Fig. 39. Segner, Capillary sible laws of attraction which will give a sensible quantity Attraction, for the elevation of the fluid li above the level MN, when the diameter of the tube is very small, and a quantity next to nothing when the diameter is considerable; and he re¬ marks, that we may select the law which gives the inverse ratio between the diameter of the tube and the height of the liquid, conformable to experiment. 140. It follows from the preceding formula, that if any solid, AB (fig. 39), possesses half the attracting power of the fluid CD, the surface of the fluid will re¬ main horizontal ; for the attraction being represented by DA, DE, and DC, DAand DE maybe combined into DB, and DB and DC into DF, which is vertical. The water will therefore not be raised, since the surface of a fluid at rest must be perpendicular to the resulting direction of all the forces which act upon it. When the attracting power of the solid is more than half as great, the resultant of the forces will be GF (fig. 40), and therefore the fluid must rise towards the solid, in order to be perpendi¬ cular to GF. When the attractive power of the solid is less than that of the fluid, the resultant will be HF ; and therefore, as in the case of mercury, the surface must be de¬ pressed, in order to be perpendicular to the force. 141. In 1751, Segner, without having seen any of Clai- Monge, and rant’s published memoirs, attempted theoretically the de- Dr Young’s termination of the form of the surface of a water-drop rest- views on jngp on a horizontal plane, assuming that the particles of the capillarity, have an attraction for each other. The nature of this problem is the same as that of determining the form of tbe upper surface of a fluid column sustained in a capillary tube: neither of these problems had engaged the attention of mathematicians. Segner proposed a theory, but he owned that it is defective. Monge, in 1787, attempted an explanation of the appa¬ rent attraction and repulsion of small bodies floating on fluids : the principle on which he grounds his explanations is the same as the more exact interpretations or the same phenomena by Young, Laplace, and Poisson. Monge did not follow up his investigations by analysis. Dr Young’s Essay on the Cohesion of Fluids, contain¬ ing his theory of capillary attraction, was read before the Royal Society, December 1804. His views of the subject are similar to those of Segner and Monge. He refers the phenomena observed in capillary tubes to the cohesive at¬ traction of the superficial particles of the fluid, in so far as it gives rise to a uniform tension of the surface. In sup¬ port of his theory, he makes two assumptions—\.st, that the tension of the fluid surface is known ; 2d, that at the juncture of a fluid surface with the surface of a solid, there is an appropriate angle of contact between the two surfaces. This angle for glass and water is nearly evanescent, where¬ as for glass and mercury it is about 140°: on these two assumptions, he thinks that a theory of capillary attraction can be satisfactorily built. In the latter part of his essay, he shows how his assumptions may be derived from ulterior physical principles. The subject of capillary attraction has more recently oc¬ cupied the attention of the Marquis de Laplace, who pub¬ lished his theory in 1806. In 1807 he published a supple¬ ment to his theory, in which he compares his formula with the experiments of Gay Lussac and others. Account of In the first treatise published by M. Laplace, his method Laplace’s of considering the phenomena was founded on the form of theory. the surface of the fluid in capillary spaces, and on the con- VOL. XII. ditions of equilibrium of this fluid in an infinitely narrow Capillary canal, resting by one of its extremities upon this surface, Attraction, and by the other on the horizontal surfaces of an indefinite v ^ y fluid, in which the capillary tube was immersed. In his supplement to that treatise, he has examined the subject in a much more popular point of view, by considering di¬ rectly the forces which elevate and depress the fluid in this space. By this means, he is conducted easily to several general results, which it would have been difficult to obtain directly by his former method. 142. Let AB (fig. 41) be a vertical tube whose sides are perpendicular to its base, and which is immersed in a fluid Analygig that rises in the interior of the 0f the ca- tube above its natural level. A pillary thin film of fluid is first raised ,\ forces, by the action of the sides of the tube ; this film raises a second film, and this second film a third film, till tbe weight of the vo¬ lume of fluid raised exactly ba¬ lances all the forces by which it is actuated. Hence it is ob¬ vious, that the elevation of the column is produced by the at- fig. h. traction of the tube upon the fluid, and the attraction of the fluid for itself. Let us sup¬ pose that the inner surface of the tube AB is prolonged to E, and after bending itself horizontally in the direction ED, that it assumes a vertical direction DC; and let us suppose the sides of this tube to be so extremely thin, or to be formed of a film of ice, so as to have no action on the fluid which it contains, and not to prevent the reciprocal action which takes place between the particles of the first tube AB and the particles of the fluid. Now, since the fluid in the tubes AE, CD is in equilibrio, it is obvious that the excess of pressure of the fluid in AE is destroyed by the vertical attraction of the tube and of the fluid upon the fluid contained in AB. In analyzing these ditt’erent attrac¬ tions, Laplace considered first those which take place under the tube AB. The fluid column BE is attracted, \st, by itself; 2d, by the fluid surrounding the tube BE. But these two attractions are destroyed by the similar attractions experienced by the fluid contained in the branch DC, so that they may be entirely neglected. The fluid in BE is also attracted vertically by the fluid in AB; but this at¬ traction is destroyed by the attraction which it exercises in the opposite direction upon the fluid in BE, so that these balanced attractions may likewise be neglected. The fluid in BE is likewise attracted vertically upwards by the tube AB, with a force which we shall call Q, and which contri¬ butes to destroy the excess of pressure exerted upon it by the column BE raised in the tube above its natural level. Now, the fluid in the lower part of the round tube AB is attracted, 1. By itself; but as the reciprocal attractions of a body do not communicate to it any motion if it is solid, we may, without disturbing the equilibrium, conceive the fluid in AB frozen. 2. The fluid in the lower part of AB is attracted by the interior fluid of the tube BE, but as the latter is attracted upwards by the same force, these two actions may be neglected as balancing each other. 3. The fluid in the lower part of BE is attracted by the fluid which surrounds the ideal tube BE, and the result of this attrac¬ tion is a vertical force acting downwards, which we may call — Q', the contrary sign being applied, as the force is here opposite to the other force Q. As it is highly probable that the attractive forces exercised by the glass and the water vary according to the same function of the distance, so as to differ only in their intensities, we may employ the constant coefficients p, p as measures of their intensity, so that the forces Q and — Q' will be proportional to p, p ; for the interior surface of the fluid which surrounds the tube 1 98 HYDRODYNAMICS. Capillary js sarne as t}ie interior surface of the tube AB. Consequently, the two masses, viz., the glass in AB, and v round BE, differ only in their thickness; but as the attraction of both these masses is insensible at sensible distances, the difference of their thicknesses, provided their thicknesses be sensible, will produce no difference in the attractions. 4. The fluid in the tube AB is also acted upon by another force, namely, by the sides of the tube A B in which it is inclosed. If we conceive the column FB divided into an infinite number of elementary vertical columns, and if at the upper extremity of one of these columns we draw a horizontal plane, the portion of the tube comprehended between the plane and the level surface BC of the fluid will not produce any vertical force upon the column ; consequently, the only active vertical force is that which is produced by the ring of the tube immediately above the horizontal plane.. Now, the vertical attraction of this part of the tube upon BE, will be equal to that of the en¬ tire tube upon the column BE, which is equal in diameter, and similarly placed. This new force will therefore be re¬ presented by + Q. In combining these different forces, it is manifest that the fluid column BF is attracted upwards by the two forces + Q, + Q, and downwards by the force -Q'; consequently the force with which it is raised up¬ wards will be 2Q — Q'. If we represent by V the volume of the column BE, by D its density, and byp' the force of gravity, then V will represent the weight of the elevated column; but as this weight is in equilibrio with the forces by which it is elevated, we have the following equation :— <7DV = 2Q-Q'. If the force 2Q is less than Q', then V will be negative, and the fluid will sink in the tube; but as long as 2Q is greater than Q', V will be positive, and the fluid will rise above its natural level; as was long before shown by M- Clairaut. Since the attractive forces, both of the glass and the fluid, are insensible at sensible distances, the surface of the tube AB will act sensibly only on the column of fluid imme¬ diately in contact with it. We may therefore neglect the consideration of the curvature, and consider the inner sur- ; face as developed upon a plane. The force Q will there¬ fore be proportional to the width of this plane, or what is the same thing, to the interior circumference of the tube. Calling e, therefore, the circumference of the tube, we shall have Q =p c; p being a constant .quantity, representing the intensity of the attraction of the tube AB upon the fluid, in the case where the attractions of different bodies are expressed by the same function of the distance. In every case, however, p expresses a quantity dependent on the attraction of the matter of the tube, and independent of its figure and magnitude. In like manner we shall have Q=p c; p' expressing the same thing with regard to the attraction of the fluid for itself, that p expressed with re¬ gard to the attraction of the tube for the fluid. By sub¬ stituting these values of Q, Q', in the preceding equation, we have gT)V — c(2p — p). If we now substitute, in this general formula, the value of c in terms of the radius if it is a capillary tube, or in terms of the sides if the section is a rectangle, and the value of V in terms of the radius and altitude of the fluid column, we shall obtain an equation by which the heights of ascent may be calculated for tubes of all diameters, after the height, belonging to any given diameter, has been ascer- Applica- ■ tail?^ b7 di;'ect experiment. tion of the . t‘ie case of a cylindrical tube, let tt represent the formula to ratio of the circumference to the diameter, h the height of cylindrical the fluid column reckoned from the lower point of the me- tnbes; niscus, q the mean height to which the fluid rises, or the height at which the fluid would stand if the meniscus were Capillary to fall down and assume a level surface, then we have ttt3 Attraction, for the solid content of a cylinder of the same height and &c* radius as the meniscus ; and as the meniscus, added to the solid contents of the hemisphere of the same radius, must be equal to ttt3, we have w3 - or for the so¬ lid content of the meniscus, follows that the meniscus base is tt/-2, and altitude 7T/ But since — =irr2 x O 3’ it -g- is equal to a cylinder whose . Hence, we have 7 r ?=/<+T; or what is the same thing, the mean altitude <7 in a cylin¬ der is always equal to the altitude h of the lower point of the concavity of the meniscus increased by one-third of the radius, or one-sixth of the diameter of the capillary tube. Now, since the contour c of the tube = 27rp, and since the volume V of water raised is equal to <7 x Trr2, we have, by substituting these values in the general formula, gDqTrr =2Trr (2p-p). (No. 1.) and dividing by Trr and ^D, we have, rq=2 —P p and q = 2 -p ~P x — gD 7 gD r (No. 2.) 144. In applying this formula to Gay Lussac’s experiments, Applica- we have the constant quantity, tion of the formula 2 q = r ^ ='647205 x 23T634 «l-0'215735 = 15*1311, Lussac’s ^ experi- for Gay Lussac’s first experiment. In order to find the ments on height of the fluid in his second tube by means of this con- water; stant quantity, we have 15*1311 0*951095 1 90381 nn-inner a P 1 r= —^ =0*951905, and 2 —- - x «-= a = 4 gu 3 7 = 15*8956, from which, if we subtract one-sixth of the dia¬ meter, or 0*3173, we have 15*5783 for the altitude h of the lower point of the concavity of the meniscus, which differs only 0*0078 from 15*861, the observed altitude. If we apply the same formula to Gay Lussac’s experi- to Gay ments on alcohol, we shall find the constant quantityLussac 8 2p - p J experi- 2—^—=6*0825 as deduced from the first experiment, ments on 9U alcohol; and k = 6*0725, which differs only by 0*0100 from 6*08397, the altitude observed. From these comparisons, it is obvious that the mean altitudes, or the values of q, are very nearly reciprocally proportional to the diameters of the tubes ; for, in the expe¬ riments on water, the value of q deduced from this ratio is 15*895, which differs little from 15*9034, the value found from experiment; and that, in accurate experiments, the correction made by the addition of the sixth part of the diameter of the tube is indispensably requisite. 145. If the section of the pipe in which the fluid ascends to ,rectai1' is a rectangle, whose greater side is a, and its lesser side d, pi^ry then the base of the elevated column will be = arf, and spaces, its perimeter c = 2a + 2d. Hence, the value of the me¬ niscus will be ae?2 IT cnrd2 ad2 2 - ^>that is 2=£ + !^l_Z^. Hence, if in the general equation No. 1 we substitute for c its equal 2a + 2rf, and for V its equal adq, we have v; . gY)qad=2p —p x2a-\-2d, Capillary Attraction, &c. experi¬ ments. HYDRODYNAMICS. _ , nn^tivp and the fluid tends to rise, and consequently to and dividing by a and by g D, we have remove’from this state which is not stable. In a similar manner it will be seen, that the third state is stable, the tourth unstable, and so on. 99 dq = 2 2p-p gv Capillary Attraction, &c. x 1 + and a < = 2 2p-p gu X 1 + d In applying this formula to the elevation of water be¬ tween two glass plates, the side a is very great compared with d, and therefore the quantity being almost insen¬ sible, may be safely neglected, comes Hence the formula be- q = 2^x Compari¬ son of the formula with Gay Lussac’s By comparing this formula with the formula No. 2, it is obvious that water will rise to the same height between plates of glass as in a tube, provided the distance d be¬ tween the two plates of glass is equal to r, or half the dia¬ meter of the tube. This result was obtained by Newton, and has been confirmed by the experiments of succeeding writers. 2p — p As the constant quantity 2 “ is the same as already found for capillary tubes, we may take its value, viz., 15-1311, and substitute it in the preceding equation, we then have 9 = 15-1311 1-060 = 14'1544 ; and since h = q- ^ , subtracting ^ =0-1147, we have Fluids may be in a state of stable and unsta¬ ble equili¬ brium in the same tube. /? = 14-0397, which differs very little from 13*574, the ob¬ served altitude, and d~ TOGO. It will be seen from the formula No. 2, that of all tubes that have a prismatic form, the hollow cylinder is the one in which the volume of fluid raised is the least possible, as it has the smallest perimeter. It appears, also, that if the section of the tube is a regular polygon, the altitudes of the fluid will be reciprocally proportional to the homologous lines of the similar base' a result which, as we have seen, M. Gellert obtained from direct experiment. Hence, in all prismatic tubes whose sections are polygons inscribed in the same circle, the fluid will rise to the same mean height. If one of the two bases is, for example, a square, and the other an equilateral triangle, the altitudes will be as 2:3|, or very nearly as 7 : 8. 146. M. Laplace has remarked that there may be se¬ veral states of equilibrium in the same tube, provided its width is not uniform. If we suppose two capillary tubes com¬ municating with one another, so that the smallest is placed above the greatest, we may then conceive their diameters and lengths to be such that the fluid is at first in equili¬ brium above its level in the widest tube, and that in pour¬ ing in some of the same fluid, so as to reach the smallei^ tube, and fill part of it, the fluid will still maintain itself in equilibrio. When the diameter of a capillary tube di¬ minishes by insensible gradations, the different states of equilibrium are alternately stable and unstable. At first the fluid tends to raise itself in the tube, and this tendency diminishing, becomes nothing in a state of equilibrium. Beyond this it becomes negative, and consequently the fluid tends to descend. Thus the first equilibrium is sta¬ ble, since the fluid, being a little removed from this state, tends to return to it. In continuing to raise the fluid, its tendency to descend diminishes, and becomes nothing in the second state of equilibrium. Beyond this it becomes 147 Although the preceding method of considering the phenomena of capillary attraction is extremely simp e and accurate, yet it does not indicate the connexion which sub¬ sists between the elevation and depression of the fluid and the concavity or convexity of the surface which every ui, assumes in capillary spaces. The object of M. Laplace s first method, contained in his first supplement, is to deter¬ mine this connexion. By means of the methods for calculating the attraction of spheroids, he determines the action of a mass of fluid terminated by a spherical surface, concave or convex, upon a column of fluid contained in an infinitely narrow canal, directed towards the centre of this surface. By this action Laplace means the pressure which the fluid contained in the canal would exercise, in virtue of the attraction of its entire mass upon a plane base situated in the interior of the canal, and perpendicular to its sides, at any sensible distance from the surface, this base being taken for unity. He then shows that this action is smaller when the surface is concave than when it is plane, and greater when the surface is convex. The analytical expression of this action is composed of two terms. The first of these terms, which is much greater than the second, expresses the action of the mass terminated by a plane surface ; and the second term expresses the part of the action due to the sphericity of the surface, or, in other words, the action of the menis¬ cus comprehended between this surface and the plane which touches it. This action is either additive to the pre¬ ceding, or subtractive from it, according as the surface is convex or concave. It is reciprocally proportional to the radius of the spherical surface; for the smaller that this radius is, the meniscus is the nearer to the point of contact. From these results relative to bodies terminated by sen¬ sible segments of a spherical surface, Laplace deduces this general theorem: “ In all the laws which render the attraction insensible at sensible distances, the action of a body terminated by a curve surface upon an interior canal infinitely narrow, perpendicular to this surface in any point, is equal to half the sum of the actions upon the same canal of two spheres, which have for their radii the greatest and the smallest of the radii of the osculating circle of the sur¬ face at this point.” , , , „ , , 148. By means of this theorem, and the laws of hydro¬ statics,’ Laplace has determined the figure which a mass of fluid ought to take when acted upon by gravity, or con¬ tained in a vessel of a given figure. The nature of the surface is expressed by an equation of partial differences of the second order, which cannot be integrated by any known method. If the figure of the surface is one of re¬ volution, the equation is reduced to one of ordinary dif¬ ferences, and is capable of being integrated by approxima¬ tion, when the surface is very small. Laplace next shows, that a very narrow tube approaches the more to that of a spherical segment as the diameter of the tube becomes smaller. If these segments are similar in different tubes of the same substance, the radii of their surfaces will be in¬ versely as the diameter of the tubes. This similarity of the spherical segments will appear evident, if we considti that the distance at which the action of the tube ceases to be sensible is imperceptible; so that if, by means of a very powerful microscope, this distance should be found equal to a millimetre, it is probable that the same magnifying power would give to the diameter of the tube an apparent diame¬ ter of several metres. The surface of the tube may there¬ fore be considered as very nearly plane, in a radius equal to that of the sphere of sensible activity ; the fluid in this in¬ terval will therefore descend, or rise from this surface very Connexion between the rise of fluids and the curva¬ ture of their sur¬ face. 100 HYDRODYNAMICS. Capillary nearly as if it were plane. Beyond this, the fluid being sub- .Attraction, jectefl only to the action of gravity and the mutual action v &c~ of its own particles, the surface will be very nearly that of a spherical segment of which the extreme planes, being those of the fluid surface, at the limits of the sphere of the sensible activity of the tube, will be very nearly in differ¬ ent tubes equally inclined to their sides. Hence it follows that all the segments will be similar. 149. The approximation of these results gives the true cause of the ascent or descent of fluids in capillary tubes in the inverse ratio of their diameter. If in the axis of a glass tube we conceive a canal infinitely narrow, which bends Tig. 41. round like the tube ABEDC in fig. 41, the action of the water in the tube in this narrow canal will be less, on ac¬ count of the concavity of its surface, than the action of the water in the vessel on the same canal. The fluid will therefore rise in the tube to compensate for this difference of action; and as the concavity is inversely proportional to the diameter of the tube, the height of the fluid will be also inversely proportional to that diameter. If the sur¬ face of the interior fluid is convex, which is the case with mercury in a glass tube, the action of this fluid on the canal will be greater than that of the fluid in the vessel, and therefore the fluid will descend in the tube in the ratio of their difference, and consequently in the inverse ratio of the diameter of the tube. In this manner of viewing the subject, the attraction of capillary tubes has no influence upon the ascent or depres¬ sion of the fluids which they contain, but in determining the inclination of the first planes of the surface of the interior fluid extremely near the sides of the tube, and upon this inclination depends the concavity or convexity of the sur¬ face, and the length of its radius. The friction of the fluid against the sides of the tube may augment or diminish a little the curvature of its surface, of which we see frequent examples in the barometer. In this case thecapillary effects will increase or diminish in the same ratio. The differential equation of the surfaces of fluids inclosed in capillary spaces of revolution, conducts Laplace to the following general result: That if into a cylindrical tube we introduce a cylinder which has the same axis as that of the tube, and which is such that the space comprehended be¬ tween its surface and the interior surface of the tube has very little width, the fluid will rise in this space to the same height as in a tube whose radius is equal to this width. If we suppose the radii of the tube and of the cylinder infinite, we have the case of a tube included between two parallel and vertical planes, very near each other. This result has been confirmed, as we have already seen, by the experi¬ ments of Newton, Haiiy, and Gay Lussac. Laplace then applies his theory to the phenomena presented by a drop of fluid, either in motion or suspended in equilibrio either in a conical capillary tube, or between two plates, and in¬ clined to each other, as discovered by Mr Hawksbee ; to the mutual approximation of two parallel and vertical discs immersed in a fluid ; to the phenomena which take place when two plates of glass are inclined to each other at a small angle ; and to the determination of the figure of a large drop of mercury laid upon a horizontal plate of glass. M. Gauss's 1^0. Laplace has failed in giving a satisfactory proof of correction the constancy of the angle of contact, or that angle which of La¬ place's theory. the free surface of the fluid makes with its surface of con¬ tact. Gauss, in 1830, endeavoured to rectify the defect by forming his equations of equilibrium on the principle of virtual velocities (see Mechanics) which he applies to the whole mass of fluid, and not to a differential element, as La¬ grange has done. By this method he obtains a sextuple integral, which extends to the whole mass, and which is to be a minimum ; if the fluid be supposed homogeneous and incompressible, the integral becomes quadruple. Further, the integral may become single, if the only forces acting be gravity and the molecular attractions of the fluid and con- Capillary taining solid, and if the sphere of activity of the two attrac- Attraction, tions be insensible. He also arrived at two equations, one &c- relative to the free surface, and which is Laplace’s funda- mental equation ; the other relative to the angle of contact, and which corresponded with Dr Young’s result. 151. Poisson’s first memoir on the theory of capillary at-Poisson’s traction was read before the Paris Academy, November theory of 1828. In it his object is to form the equations of equili-caPillary brium of fluids on physical principles, i.e., by assuming that ^^actlon> a mass of fluid is made up of distinct molecules, separated moir one from another by spaces excessively small, and void of ponderable matter. As a preliminary to the discussion, the magnitude of these molecules, as also the spaces between them, are assumed to be so small, that a line which may be supposed to be a great multiple of them is of insensible magnitude. The mole¬ cules are attractive of each other, and at the same time are repulsive, owing to their proper heat: their action and re¬ action are equal; the force decreases rapidly as the distance increases, and it is only sensible at insensible distances. The influence of these attractive centres is felt at distances very great when compared with the molecular spaces, and the rapid decrease to commence only at distances which are large multiples of these small intervals. By molecular action is to be understood the excess of the repulsion over the attraction of the molecules, and this force is supposed to be different for different points of any two molecules. The mean value is called the principal force, and the secondary force is the variation from this nor¬ mal value, according as different points of the molecules are directed towards each other. The secondary force is important in solids, inasmuch as it gives rise to their rigi¬ dity and resistance to the lateral motion of their molecules ; the want of this force in fluids causes their particles to be very mobile. It is thus that a fluid is distinguished by Poisson from a solid : If a point be taken anywhere in the interior of a fluid mass, and a straight line of insensible length, but a great multiple of the mean intervals between the molecules, be drawn in any direction from that point, the mean interval between the molecules that lie in the line is constant, though the particles may be irregularly dis¬ posed along it. Reasoning on the ground of these suppositions, Poisson forms equations relative to the pressure in the interior of a fluid mass, which are the same as if he had started from the supposition of the equality of pressure in every direction. His reasoning on the above suppositions leads him to the explanation of a known fact; but for all this, his assumptions cannot be declared true until they satisfy all the facts which are known to depend on the intimate constitution of fluids. He afterwards finds the equations of equilibrium relative to the surface of separation of two fluids incumbent on one another, and one of the fluids being suppressed, the equa¬ tion of the free surface of a single fluid. His first memoir closes with this principal conclusion : Capillary phenomena are due to the molecular action resulting from the calorific repulsion, and an attractive force, and modified not only by the form of the surfaces, as in Laplace’s theory, but, more¬ over, by a particular state of compression of the fluid at its superficies. He shows that the variation of density near the surface is extremely rapid, and also that the molecular attractions in fluids as well as in solids extends farther than the calorific repulsion. 152. In the year 1834, Poisson confirmed the above Poisson’s conclusion, and the consequences which flow from it withsecond m Jnstead of using tubes, he employed plates, as in fig. 27, inclined at a small angle with the line of junction vertical, and so arranged the same two plates that they could be dipped and dried, and again placed in the different fluids, and the ascents of the rectangular hyperbola taken. M. Link found that when he used distilled water, nitric acid, a solution of Kali causticum, spirit of wine, sulphuric ether, and rectified sulphuric acid, the ascents were equal between the same two plates. This gentleman in 1836 published in the Annalen experiments which were made on the same sub¬ ject, but not coinciding with the former, for it was found that different fluids did not ascend to equal heights be¬ tween the same two plates, and the experiments only par¬ tially confirmed the law to which theory leads, of equal ascents of the same fluid between plates of different mate¬ rial well moistened. 161. About the same time Dr Frankenheim of Breslau made experiments on the ascents of fluids in capillary glass tubes, to determine the synaphia, or cohesion of fluid bodies. Let A = height of ascent, r = radius of tube, then the specific synaphia varies as r (A + £ rf. Franken- heim’s ex¬ periments. Illustrations of Capillary Attraction. Examples 162. Many natural phenomena are due to capillary at- ofApiUary traction, as, e.g., if the foundation of a building be moist, rac ion. the moisture wjij ascencJ t]le fine capjl|ary tubes 0f t]le stones and mortar, and cause the walls to be damp. So also if a tract of sand or shingle have a hard impermeable base, the rain will, unless drained off, render the district damp and marshy. An excellent illustration of the fact is to be found in the expansion of wood by water. Thus, in the south of France, a large cylinder of freestone, of a proper diameter, and several feet in length, has a number of circu¬ lar grooves made round its surface ; into these grooves wedges of dry wood are driven, and then well soaked with water. After a few hours, the solid cylinder breaks up into rough millstones, which require very little labour to ren¬ der them fit for the market. Again/it is well known that on a line of rail the rails are secured to the sleepers by means of chairs, and a wooden key binds both rail and chair firmly together. The key must remain immoveable in its position; and in order to do this it is first thoroughly steamed, then subjected to a pressure of 12 lbs. on the square inch. The key is now kept in the drying-house till required, when it is easily driven into its cavity, while the moisture, entering its capillary tubes, causes it to expand, and hold rail and chair together with great tenacity. This expansive power of the key has been known to burst asunder its iron chair. Similarly also tight ropes may be rendered still tighter by water being thrown upon them, and consequently may become very serviceable in the arts. annexes-0 i ^.ut one beautiful application of the principle is to mose. be found in the ascent and descent of sap in trees and plants. M. Dutrochet has named this inward and outward move¬ ment endosmose (evSov, inwards, and wapos, impulsion), and exosmose (e^w, outwards), respectively. All plants and tiees possess cells, which contain liquids of different densi- ties, and which are continually interchanging their contents. When the walls of the cells are thin, the fluid is drunk up VyU r?P1^ Y’ The fluids on either side of the membrane i er horn each other in density, but have some affinity for t ie membrane between them as well as for each other. By the endosmotic process, then, a thin liquid passes rapidly upwards in considerable quantity, mixing in its progress with liquids of a denser sort, while, by the exosmotic movement, the latter liquids pass outwards with a slower motion, and in smaller quantity than the former enters. These movements take place in both the living and dead tissue, and they are influenced by the nature of the fluids and of the membrane ; they are nicely shown in the case of a unicellular plant Ihus, when one of the cells of the Yeast plant is placed in a dense liquid, it rapidly loses, by an outward movement, its liquid contents, since the cell becomes more or less col¬ lapsed ; but if in a thin liquid, that liquid will rush up the cell and swell it. It is supposed that the bursting of the seed-vessels of several plants is due to the distention of the cells by endosmose, which causes a curvature in the parts, and ultimately rupture. Endosmose, however, is modified in the living plant by the vital actions going on within the cells, and to these actions are due the continued move¬ ments of fluids through the cell walls. 164. The whole process of the endosmotic and exosmotic movement may be shown by the following experiment. Take a glass vessel filled with alcohol, having its open end covered tight with a bladder, which has been previously well soaked in water, and is now in close contact with the alcohol. Let this apparatus be immersed in a vessel con¬ taining water, the bladder being under the surface. At the end of a few hours, it will be found that so much water has penetrated the bladder-covering and mixed with the alco¬ hol, while a smaller quantity of the latter has made its escape and mingled with the water. On taking up the glass vessel, the surface of the bladder, instead of being flat, will now be puffed outwards and highly convex, so that, if pricked with a needle, a fine column of liquid will be seen ascending to a height of several feet. The ascent of the one is partly caused by capillary attraction, partly also by the chemical affinity of the two fluids, while the greater penetration of the water is owing to the less powerful at¬ traction of the capillary tubes of the bladder on that fluid. The alcohol, being more strongly attracted by the tubes of the bladder, flows out less readily. 1 he principle may also be illustrated with two dif¬ ferent gases; thus, take a common glass tumbler full of air, and tie carefully over its open end an india-rubber covering. Place it now under a large bell-glass full of hydrogen, and resting in a dish of water, and it will be found that the hy¬ drogen will gradually penetrate the rubber covering, and mix with the confined air. Such a quantity of hydrogen will mix with the air that the rubber will be much distended, and at last burst. If we reverse the experiment, and put hydrogen in the tumbler, surrounded by air, the rubber will become concave instead of convex. We may have an idea of the intensity of the forces which take place during these endosmotic and exosmotic move¬ ments from the simple fact, that if a glass or porcelain vessel, capable of resisting a pressure of 700 lbs. on the square inch, have its neck well stoppled with a dry piece of wood, and if the projecting end be allowed to dip into water, the liquid will rush up the capillary tubes of the wood, and in a short time break the vessel to pieces. Dutrochet esti¬ mated that with a vessel filled with fluid of a density P3, and placed in water, the endosmotic force would be equal to a pressure of 4^ atmospheres. Capillary Attraction, &c. Experi¬ ment with two fluids. Experi¬ ment with two gases. Intensity of the forces. On the Form of Drops. 165. It was observed by M. Monge, that when drops of on alcohol fall upon a surface of the same fluid, they do not form at first mix with it, but roll over its surface, impinge against of drops, each other, and are reflected like billiard balls. He ob¬ served also an analogous phenomenon in the drops of water which fall from the oars during the rowing of a boat, and during the condensation of the vapour of warm fluids. In repeating the experiments of Monge, Sir David Brewster found that the phenomena were most beautiful when the capillary tube discharged the drops upon the in¬ clined plane of fluid which is elevated by the attraction of the edge of the cup. They ran down the inclined plane HYDRODYNAMICS. 103 Capillary with great velocity, and sometimes even ascended the simi- Attraction, Jar plane on the opposite side ot the vessel. W hen the &c- drop was discharged at the distance of one or two tenths of ^ an inch from the surface of the water, they had always the same magnitude when the tube was held in the same posi¬ tion ; but when the point of the tube was brought within a tenth of an inch of the surface of the spirit of wine, this surface, instead of attracting the drop to it instantly, as Saussure would have predicted, actually resisted the gra¬ vity or weight of the drop, and allowed it to attain a diameter nearly twice as great as it would have had, if it had been discharged in the ordinary manner. This swollen globule floated upon the surface in the same manner as the smaller drops, surrounded with a depression of the fluid surface similar to what is produced by a glass globule floating on mercury, or by the feet of particular insects, that have the power of running upon the surface of water. The floating globules are often produced even when they are discharged from a height of three or four inches ; and by letting them fall upon the inclined plane of the fluid formerly mentioned, they will often rebound from the surface, and fall over the sides of the cup. 166. In a phenomenon the very reverse of the formation a fluid^ ^ of a drop, which was first noticed by Sir David Brewster, film. the cohesion of fluids is shown in a very interesting manner. If we take a phial, with a wide mouth, half filled with Canada balsam, and allow the balsam to flow to the mouth of the phial and fill it up, then when the phial is placed on its bottom, a fine transparent film of balsam will be seen extending over the mouth of the phial. If we now take a piece of slender wire, and touch the film near the middle, so as to tear aw^ay a little part of it, the remaining part of the film which has been elevated by this force will descend to its level position, and the ragged aperture from which the balsam has been torn will be seen to assume a form perfectly circular, having its edge in a slight degree thick¬ ened, like a circle with a raised margin turned out of a piece of wood. This fine circular aperture grows wider and wider, and continues to preserve its circular form till the mouth of the phial is again opened. 167. We shall now conclude the subject of capillary mentby attraction with an account of an experiment made by Sir Sir d/ David Brewster, and intimately connected with the sub- Brewster. ject. Above a vessel MNOP (fig. 42), nearly filled with water, a convex lens, LL, was placed at the distance of the Capillary tenth of an inch, and rays R, R, R, were incident upon its Attraction, upper surface. The focus of these rays was at F, a little beyond the bottom of the vessel, so that a circular image of the luminous ob¬ ject was seen on the bottom of the vessel, having AB for its diameter. If the lens is now made to descend gra¬ dually towards the surface of the water, and the eye kept steadily upon the luminous image AB, a dark spot will be seen at D in the centre of AB, a little while before the lens attracts and elevates the water MN. Sometimes this spot may be seen playing backwards and forwards by the slight motion of the hand, so that the lens can even be withdrawn from the fluid surface without having actu¬ ally touched it. In general, however, the sudden rise of the water to the lens follows the appearance of the black spot. When the water is in contact with the glass, the focus of the rays R, R, is now transferred to /, and the cir¬ cular image on the bottom is now ab, and the intensity of the light in this circle is to that in the circle AB, as AB2: ab2. Now it is obvious, that the darkish spot at D is just the commencement of the transference of the focus from F to/; or when the dark spot is produced, the progress of the rays is the same as if the focus were transferred to /. This remarkable effect may arise from two causes. Istf. The ap¬ proach of the lens to the surface MN, may occasion a de¬ pression mon in the surface of the fluid of the same curva¬ ture as L/L, which would have the effect of transferring the focus from F to/. 2d. The transference of the focus from F to/may arise from the optical contact of the glass and water taking place at a greater distance from the lens than that at which capillary attraction commences. PART IL—HYDRAULICS. 168. Hydraulics is that branch of the science of Hy- mass, or rising perpendicularly in jets deaux from the pres- drodynamics which relates to fluids in motion. It compre- sure of the atmosphere; whether moving in pipes and canals, hends the theory of running water, whether issuing from or rolling in the beds of rivers. It comprehends also the resist- orifices in reservoirs by the pressure of the superincumbent ance or the percussion of fluids, and the oscillation of waves. CHAPTER I.—THEORY OF FLUIDS ISSUING FROM ORIFICES IN RESERVOIRS, EITHER IN A LATERAL OR A VERTICAL DIRECTION. Prelimina- 169, ^ water issues from aT1 office either in the bottom ry observa- or s'^e a reservoir, the surface of the fluid in the reser- tions. voir is always horizontal till it reaches within a little of the bottom. When a vessel, therefore, is emptying itself, the particles of the fluid descend in vertical lines, as is repre¬ sented in fig. 43 ; but when they have reached within three or four inches of the orifice mn, the particles which are not immediately above it change the direction of their motion, and make for the orifice in directions of different degrees of obliquity. The velocities of these particles may be decomposed into two others, one in a horizontal direc¬ tion, by which they move parallel to the orifice, and the other in a vertical direction, by which they approach that orifice. Now, as the particles about C and D move with greater obliquity than those nearer E, their horizontal ve¬ locities must also be greater, and their vertical velocities less. But the particles near E move with so little obliquity that A their vertical are much greater than their horizontal velocities, and very little less than their absolute ones. The different ^ particles of the fluid, therefore, will rush through the orifice mn with very different velocities, and in various directions, and will arrive at a certain distance from the c orifice in different times. On account of the mutual adhesion of the fluid particles, however, those which have the greatest Cause of the vena contractu. 104 —T HYDRODYNAMICS. Motion of velocity drag the rest along with them ; and as the former Fluids, &c. move through the centre of the orifice, the breadth of the issuing column of fluid w:ill be less at op than the width of the orifice mn. 170. That the preceding phenomena really exist when a vessel of water is discharging its contents through an aperture, experience sufficiently testifies. If some small substances specifically heavier than water be thrown into the fluid when the vessel is emptying itself, they will at first descend vertically, and when they come within a few inches of the bottom they will deviate from this direction, and describe oblique curves similar to those in the figure. The contraction of the vein or column of fluid at op is also ma¬ nifest from observation. It was first discovered by Sir Isaac Newton, and denominated the vena contractu. 171. When the orifice is in a thin plate this will be the case, and the contracted part being outside the reservoir may be clearly seen and accurately measured. When the orifice is circular, the vein having attained its least section continues cylindrical in form and has a velocity nearly equal to that due to the charge. Hence the discharge will be the product of the contracted section into the velocity, so that the effect of the contraction is limited to the reduction of the value of the section which enters into the expression of the discharge. The flow will take place as if the real circular opening in the vessel were replaced by one the diameter of which would be equal to the section of contrac¬ tion, but in which imaginary opening no contraction takes place in the vein issuing out of it. But if to the circular orifice we attach a cylindrical pipe the fluid threads con¬ verge on arriving at the junction of the pipe and the wall of the vessel, and so the section of contraction takes place at the entrance of the pipe. But now beyond this section of contraction the sides of the tube attract, and therefore cause the fluid threads to dilate on all sides ; and these is¬ suing parallel to each other and to the axis of the pipe, wholly fill the tube, so that the section of the vein equals at its exit the orifice in the vessel’s side, but the velocity is not that due to the charge. Were the flow produced solely by the pressure of the fluid, then the velocity at the section of contraction would be that due to the charge, and would diminish in proportion as the fluid vein enlarged it¬ self in virtue of the hydraulic axiom,—that when an incom¬ pressible fluid in motion forms a continuous mass, the velocity at all its diverse sections is inversely proportional to the area of the section ; the velocity then would cease to diminish when the diverging vein had reached the sides of the tube. Again, when the orifice is at the lowest part of the vertical side of a vessel, the lower edge coinciding with the floor of the vessel, the contraction is then destroyed on that side, and the discharge is somewhat increased. If, in¬ stead of a cylindrical adjutage, we make use of a conical mouth-piece, or one converging to a point exterior to the side of the reservoir, then there will be two distinct con¬ tractions of the vein, one at the entrance of the adjutage, which will necessarily diminish the velocity due to the charge, and the other at a small distance beyond the issue, the breadth of which will be less than that of the external mouth. Such an adjutage is very regular, throws the wa¬ ter to a greater distance or height, and has a greater flow than that through an orifice in a thin plate. These conical or truncated pyramidal adjutages are frequently used in large manufactories for discharging water upon mill-wheels. The case of the adjutage having its narrow mouth fitted into the side of the reservoir, gives us the largest flow from any kind of tube : it will necessarily have one contracted part at the orifice. This last kind of adjutage was known to the ancient Romans ; several citizens had been granted the privilege of drawing a certain volume of water irom the public reser¬ voirs, but as they increased their supply by using this kind of tube, the fraud was detected, and the use of these tubes Motion of legally forbidden except at a distance of 52 feet or upwards Fluids, &c. from the reservoir. 172. Since the direction and velocity of the fluid particles porm of constituting a vein are symmetrical around the parts of the contracted circular orifice, the contracted vein must also be symmetrical vein. in form, and therefore some solid of revolution ; it is found to be a conoidal figure. It is actually so, as we shall after¬ wards see, from observations that have been made upon it. Beyond op (fig. 43), the narrowest section of contraction, this contraction ceases, and the vein continues sensibly cy¬ lindrical for some distance till the resistance of the air and the weight of each particle, together with other causes, en¬ tirely destroys the form of the curve. 173. The three principal parts of the vein were early in¬ vestigated, and their ratios determined. Thus the diameters mn and op, and the length mo, are in the fatio of the num¬ bers BOO : 0-79 : 0‘39, i.e., on this supposition the distance of the contracted vein is about one-half the diameter of the smaller section, and 0’39 of the orifice. But Michelotti, from a mean of more recent experiments, has ranked them in the ratio of TOO : 0-787 : 0’498, which D’Aubuisson follows. The ratio, then, of mn to op being as TOO : 0,787, the sectional areas of each will be l2: (0,787),2=12 : '619. The distance also of the contracted vein from the orifice will be a very little more than half the diameter of the ori¬ fice, or mo = V-~ nearly : If s, now,be the contracted section, and S that of the orifice, ^ = 0'619 S. 174. We proceed now to find the ratio subsisting between the velocities of the particles in the vessel and at the orifice. We may suppose that the mass of fluid is divided into infinitely small horizontal laminae or layers, as NMgh (fig. 43), each particle in the same section having the same “Velocity, and all descending parallel to each other. Let each particle in the vessel have a velocity v; Y, the velocity of escape ; A, the horizontal section of the vessel; S or mS, that of the orifice at the bottom, where m is the coefficient of contraction. During a time, t, a volume will escape = mS . V. but during this same time, the fluid sur¬ face of the water will descend through a space M^, say = velocity of particles into time = «.£, and the correspond¬ ing volume will be A . v. *, which must be the same volume as that discharged at the orifice during time t. Therefore A.u.<=mS . V|. t\ or A.v=wSV, i.e., v : V = mS : A ; or the velocities are inversely as the sections. Hence, it the areamS of the orifice be infinitely small with respect to the area A of the horizontal section of the laminae, the mean velocity of escape will be infinitely greater than that of the laminae; that is, while the velocity at the orifice is finite, that of the laminae will be infinitely small. 175. Before applying these principles to the theory of hydraulics, it may be proper to observe, that several dis¬ tinguished philosophers have founded the science upon the same general law from which we have deduced the princi¬ ples of hydrostatics (48). In this way they have represented the motion of fluids in general formulae; but these formulae are so complicated from the very nature of the theory, and the calculations are so intricate, and sometimes impractica¬ ble from their length, that they can afford no assistance to the practical engineer. 176. Definition.—If the water issue at m n with the F-(r_ same velocity V, that a heavy body would acquire by falling ° freely through a given height H, this velocity is said to be due to the height H, and inversely the height H is said to be due to the velocity V. The quantity H is also termed the head or charge under which the flow takes place. 177. Prop. I.—The velocity with which a fluid escapes from a small orifice in the bottom or side of a ves¬ sel kept constantly full, equals that attained by a HYDRODYNAMICS. 105 Motion of heavy body falling freely from the surface of the Fluids, &c. fluid to the orifice. It will be proved in Mechanics, that, when a heavy body is projected obliquely upwards, the composition of the ac¬ celerating force of gravity, and the uniform velocity V of projection, will cause the body, during a time, t, to move in a curve called a 'parabola, the equation to which is found to be ?/2= Ahx, where h = height due to velocity, x the absciss in the direction of gravity, y the ordinate parallel to the direction of projection, or x and y are the co-ordinates for any point of the curve. Now, this is true, whatever be the nature of the body; and, therefore, also for a jet of water issuing from an orifice. Let the orifice be opened in the side at A (fig. 44), then Fig. 44. the jet will assume the form AMD. The equation y‘1 = Ahx gives us A = = height due to velocity of exit. This value of h may be easily calculated by placing a vertical graduated stick alongside the vessel, and having its zero point at the centre of the orifice, with another moving at right angles, and also graduated; this last will give us any ordinate, as PM or CD; and therefore, also, the correspond¬ ing abscissa AP or AC. Wherefore, by measuring the ordinate and its corresponding absciss, the height h due to the velocity of exit may be determined from the equation to the parabola. But the velocity which a body (by me¬ chanics) falling freely attains, after passing through a cer¬ tain height h, is represented by V = >j2gh. Therefore, the velocity of issue at the orifice is that due to the height BA. If tbe orifice be at the bottom, the velocity will be that due to a fall from the surface to the orifice. 178. Cor. 1.—As fluids press equally in all directions, the preceding proposition will hold true when the orifices are at the sides of vessels, and when they are formed to throw the fluid upwards, either in a vertical or an inclined direction, provided that the orifices are in these several cases at an equal distance from the upper surface of the fluid. Cor. 2.—When the fluid issues vertically, it will rise to a height equal to the perpendicular distance of the ori¬ fice from the surface of the fluid ; owing to the resistance of the air, however, and the friction of the issuing fluid upon the sides of the orifice, jets of water do not exactly rise to this height. 179. If H be the height from which a falling body, is dropped, then the velocity which it acquires after a certain time, will be equal to that of any particle of the fluid as it issues from an orifice, or V = \l2g\{, where <7 = the velocity, which a body falling freely would attain at the end of a unit of time. If the mean velocity of all the particles be that due to a charge H, then the theoretic velocity is V = V2gH. Supposing, then, that the fluid threads issue from the orifice parallel to each other, and knowing the velocity of the charge of one particle, the theoretic discharge, or that volume which escapes in a unit of time, will evidently be the volume of a prism, having for its base that of the orifice, and that velocity for height. Calling then S the area of the orifice, S . V represents the theoretic discharge, or S . V = S V2gH. VOL. XII. But the actual discharge is always less than that theoreti- Motion of cally determined; and in order to have an exact idea of Fluids, &c. this, take a perpendicular section of the fluid vein at a small distance from the orifice ; then since the discharge is mani¬ festly equal to the sectional area into the mean velocity of any thread at the instant it is crossing that section, it is clear that if this section were equal to that of the orifice, and if the velocity were that due to the charge, then the actual would be equal to the theoretic discharge. But, whether from the section of the vein being less than that of the orifice, as in the case of a flow through a thin plate, or from the velocity being less than that due to the charge, as in cylindrical pipes; or from a diminution in both sec¬ tion and velocity, as in the case of conical adjutages, the result always is, that the actual is less than the theoretic discharge, and so the latter must always be multiplied by some fractional number, so as to obtain the former. Let this fractional number be m, the coefficient of contraction, then the actual volume discharged = mS\l2gH. 180. The reader will probably be surprised when he finds in some of our elementary works on hydrostatics, that the velocity of the water at the orifice is only equal to that which a heavy body would acquire by falling through half the height of the fluid above the orifice. This was first maintained by Sir Isaac Newton, who found that the dia¬ meter of the vena contracta was to that of the orifice as 21 to 25. The area therefore of the one was to the area of the other as 212 to 2o2, which is nearly the ratio of 1 to s! 2. But by measuring the quantity of water discharged in a given time, and also the area of the vena contracta, Sir Isaac found that the velocity at the vena contracta was that which was due to the whole altitude of the fluid above the orifice. He therefore concluded, that since the velocity at the orifice was to that at the vena contracta as 1: 2, and the latter velocity was that which was due to the whole al¬ titude of the fluid, the former velocity, or that at the ori¬ fice, must be that which is due to only half that altitude, the velocities being as the square roots of the heights. Now the difference between this theory and that contained in the preceding proposition may be thus explained. The velocity found by the preceding proposition is evidently the vertical velocity of the filaments at any point, which being immediately above the centre of the aperture are not diverted from their course, and have therefore their verti¬ cal equal to their absolute velocity. But the vertical velo¬ city of the particles below and above the former is much less than their absolute velocity, on account of the obliquity of their motion, and also on account of their fric¬ tion on the sides of the orifice. The mean vertical velocity, consequently, of the issuing fluid will be much less than the vertical velocity of the first particle, that is, than the velo¬ city found by the above proposition, or that due to the full height. Now the velocity found by Sir Isaac Newton from measuring the quantity of water discharged, was evi¬ dently the mean velocity, which ought to be less than the velocity given by the preceding proposition; the two velo¬ cities being as 1 : V 2, or as 1 : L414. The theorem of Newton therefore may be considered as giving the mean velocity at the orifice, while the proposition gives the ve¬ locity of the particles at the surface, or the velocity at the vena contracta. 181. Prop. II.—To find the volume discharged from a very small orifice in the side or bottom of a reser¬ voir kept constantly full, the time of discharge and the altitude of the fluid being given. Let S = area of orifice, Q' = volume discharged in time T, and call H the height of the fluid, or the constant charge due to the constant height. Then, since the actual dis- charge in a unit of time or one second, is Q =mS V 2^H o 106 HYDRODYNAMICS. Motion of (179), therefore, the volume discharged during T units ^ds- &c* or seconds, will be QT, or Q' = w ST V 2^H. ^ Wherefore, Q', m, S, T or H, may be easily determined, all the others being given. The diminution of discharge conceived as arising from the sectional area or velocity diminishing, is always a con¬ sequence of the contraction of the vein in passing through the orifice. It is the variation in the actual, from the theo¬ retical discharge, that gives rise to m, the coefficient of contraction, equal to the ratio of the actual to the theoreti¬ cal discharge. It is a very important number, for, on its exactness depends the accuracy of formulae when practically applied to the flow of water ; m is always determined ex¬ perimentally. 182. It is supposed in the preceding proposition that the orifice in the side of the vessel is so small, that every part of it is equally distant from the surface of the fluid. But when the orifice is large, like M (fig. 45), the depths of different B parts of the orifice below the surface of the fluid are very different, and conse¬ quently the preceding formula will not give very accurate results. If we sup¬ pose the orifice M divided into a number of smaller orifices, a, b, c, it is evident that the water will issue at a with a velocity due to the height Da, the water at b, with a velocity due to the height E&, and the water at c, with a velocity due to the height Fc. When the whole orifice, therefore, is opened, the fluid will issue with different velocities at different parts of its section. Consequently, in order to find new formulm expressing the quantity of water discharged, we must con¬ ceive the orifice to be divided into an infinite number of areas or portions by horizontal planes ; and by considering each area as an orifice, and finding the quantity which it will discharge in a given time, the sum of all these quanti¬ ties will be the quantity discharged by the whole orifice M. Fig. 4a. 183. Prop. III.—To find the volume discharged by a rect¬ angular slit in the vertical side of a vessel, kept con¬ stantly full. Let M (fig. 46) be the vessel, of a vertical height AB, equal to the depth, and / the width of the slit. If now we have a series of elementary rectangular orifices placed verti¬ cally in the side of M, then if the lowest be at a depth AB or H, below the fluid surface, the velocity with which the fluid issues from this orifice will be Now we may make BG equal to this quantity, and this or¬ dinate will represent the velocity, while the absciss does the depth ; so also we may take any other point C, at a depth C or AC = x, and the velocity of issue will be represented by CD=y=f2^; the same will be the case for all other points in AB, and, evidently, if we join all the ordinate points as C, D, &c,, we shall have a pa- Fis-i6- bolic curve; and as y- = 2gx, where 2g or 64-4 feet is the parameter, we shall have the velocity of a fluid thread issu¬ ing from a reservoir at any point equal to the ordinate of a parabola, the parameter of which is twice the measure of the Motion of accelerating force of gravity, with a depth under the sur- Fluids, &c. face as the abscissa. Suppose now that all the rectangular orifices in the depth AB were opened, making a rectangular slit ABPR, with a width of l units, the discharge through this opening may thus be obtained. Since the surface of the jet has been proved to be parabolic, we shall evidently have a volume of water which shall be the frustum of a paraboloid, the side of which will be ABGDA, and width l; and since the area of a parabola = §ds of the rectangle contained by AB and BG, and AB. BG = H . v/2^r.H, therefore the volume, or the discharge for the rectangular opening, is = §. /.H.V2^H = f /. H Vti.sf^g. 184. Prop. IV.—To find the volume discharged from a rectangular orifice. This volume may be deduced from the last. Let the rectangular orifice have a width equal to /, and a depth, = OB; call AO = ^, therefore, the volume of discharge by the frustal paraboloid AOUA = § /. A . v^A, or = § / . A . VA . V2g. Hence the discharge by the rect¬ angular orifice OBPN = the discharge by ABPR, less that by_ AONR = f /. H. VH . V2^-f l.h. VTi. V2^= f l.V2g (H Vti-h Vh). 185. Prop. V.—To determine the mean velocity from the above slit (Prop. III.) The mean velocity of the fluid from the rectangular open¬ ing ABPR, may be thus obtained. Let K be the point from which would issue a fluid thread with the mean velo¬ city ; and making the depth AK = 2, the mean velocity for this thread will be = f2gz, which, multiplied by the area or /. H, will give the volume discharged with the mean velo- cityfrom the opening ABPR, = LH.\/2jDb, JDc...8ic....O; that is, as the corresponding equal velocities A/Ha', a/H6', VHe',...&c....O. Hence, as the vessel empties itself, the velocity of discharge gradually decreases from a maximum, d2g.DB, to a minimum as zero, following the same law as does a body when thrown verti¬ cally upwards. Each is an example of uniformly retarded motion : the velocity of escape is governed by the same law. 190. Cor. 1.—As the velocities of falling bodies are as the square roots of the heights through which they fall (see Mechanics), the velocities of fluids issuing from a very small orifice are as the square roots of the altitude of the water above these orifices. As the quantities of fluids dis¬ charged are as the velocities, they will also be as the square roots of the altitude of the fluid. This corollary holds true of fluids of different specific gravities, although Be- lidor (Architect. Hydrant., tom. i., p. 187) has maintained the contrary ; for though a column of mercury presses with fourteen times the force of a similar column of water, yet the column of mercury which is pushed out is also fourteen times as heavy as a similar column of water; and as the resistance bears the same proportion to the moving force, the velocities must be equal. 191. Cor. 2.—When a vessel is emptying itself, if the area of the laminae into which we may suppose it divided, be everywhere the same, the velocity with which the sur¬ face of the fluid descends, and also the velocity of efflux, will be uniformly retarded. For as the velocity V with which the surface descends is to the velocity v at the ori¬ fice, as the area a of the orifee to the area A of the sur¬ face, then V : v = a : A ; but the ratio of a : A is constant, therefore V varies as v, that is, Y : = v: v ; but, v:v = dh : >Jd, h being the height of the surface above the orifice, therefore V : = : *//*■ But this is the pro¬ perty of a body projected vertically from the earth’s surface, and as the retarding force is uniform in the one case (see Mechanics), it must also be uniform in the other. 192. With respect to the volume discharged, we know from mechanics that when a body starts with a certain ve¬ locity which is gradually lost altogether, it describes one- half the space only that it would have described in the same time had it continued to move uniformly with the velocity with which it began. Similarly, also, the volume of fluid in the vessel may be looked upon as a cylindrical or pris¬ matic mass, having its base equal to the dimensions of the orifice, and its height, the space which the first issuing particle would describe with a motion uniformly retarded, and identical with that by which the discharge takes place ; if, now, the particle had retained its first velocity it would have doubled its space, or the height of the cylindrical or prismatic mass would have been doubled, and therefore also the volume of discharge from the orifice would have been doubled. Hence, then, it appears that the volume of fluid passing through an orifice at the bottom of a prismatic or cylindrical vessel, the surface of which is gradually nearing the orifice till the vessel empties itselfj having received no supply, is equal to one-half that which would be given during the time of complete discharge, if the flow had taken place under a constant charge equal to the pri¬ mary. 193. Cor. 3.—If a cylindrical vessel be kept constantly full, twice the quantity contained in the vessel will run out during the time in which the vessel would have emptied itself. For the space through which the surface of the fluid at L would descend if its velocity continued uniform, being 2 LM, double of LM, the space which it actually describes in the time it empties itself, the quantity discharged in the former case will also be double the quantity discharged in the latter; because the quantity discharged when the ves¬ sel is kept full, may be measured by what the descent of the surface would be, if it could descend with its first velo¬ city,—M being regarded as the only orifice in and at the bottom of the vessel (fig. 47). 194. Prop. IX.—To find the time required to empty a vessel. Suppose that H is its charge, A the horizontal sec¬ tion of the vessel, and T the time of complete discharge. The volume of water contained in the vessel above the orifice, and therefore the whole quantity discharged during the time, will be A.H. But (by 392) the volume which would have been discharged in the same time under the constant charge H would have been 2A.H. This same volume of discharge during time T equals m&T s!2gR, where again S or mS is the area of the orifice ; whence 2A.FI = mSlV%H; or, 107 Motion of 108 Motion of Fluids, &c. T = HYDRODYNAMICS. 2A.H A /2H = 2 mS nJ2g'ti g ’ m'S 2g’ 195. Cor.—If’ T be the time that the volume A.H would take to flow out, when the head H was constant, then (by 181), A.H A /W A.H=*mSTV^H; T = AA a/ ^ * mb»j2gH mS v 2g . from the above T = 2T'; that is, the time which a pris¬ matic vessel takes to be completely discharged, is double that in which the same volume would flow out, if the head had remained constantly the same as it was at the com¬ mencement of the discharge. 196. Prop. X.—To find the time that the fluid surface takes to pass through a given depth. Let t be this time for the level to descend a vertical depth a. Now we have already seen that the time during 2A /H which the whole volume will discharge itself = the charge at the beginning of the flow being H ; and by putting H -a = /j for the charge or head at the end of the time t, the time during which the volume hA. would be en¬ tirely discharged Now, we have the time in which the whole volume with a head H, and that in which a head equal to h or (H — a), will be discharged ; therefore the time in which a head equal to a will be discharged, is the difference between these two times; or, _2A /H_2A / h _ 2A 1 mSv 2g mSv 2g mS V‘2g V/i). 197. Cor.—The quantity of fluid discharged in the given time t may be found by measuring the contents of the vessel between the planes, the descent of the surface, or the depth a, being known. 198. Prop. XI.—To find the volume discharged in a given time, and the depth that the level reaches after a certain time. From the last expression for the time required to empty a vessel, we have —= -v/H - VA; or, ^2A ^•\-llSh = VH, and, by squaring each side, + 2 (^l^) / tm§V2g\ V 2A / V 2A ... tm^9 ('^i+ v'f) = H-A=a=the depth that the level reaches in a certain time. If now we multiply this depth by A, the horizontal sec¬ tion of the vessel, we shall have the volume discharged in the time t-, volume discharged, say, Q' = (H-A)A = ^SV,2^• 199. Prop. XII.—To find the mean hydraulic charge. The prismatic vessel fig. 48 receives no supply, but dis¬ charges water through an ori¬ fice, the area of which is S; the water at the commence¬ ment of the flow has a head H, and at the end of the time T has a head equal to h; the mean hydraulic charge H' is required, by which, ceteris paribus, the same volume of water would have been dis¬ charged. The volume with this mean head H' will, in time T, be Motion of Q =mSTv/2$r — A) A; and the time in which this Ffui(i8> &c. took place was T = m^*/2g “■ VA). Substitute this value of T in the above expression for the volume, then, 2A Q' = mSV2g ^=(VH-VA)VH' = (H-A)A; \ V H' - H~A _VH + VA 2V H — Vh) 200. Cor.—If A = 0 .-. H' = ~ 4 Dr Young made use of this proposition in determining by experiment the coefficient of contraction at an orifice. See his experiments (383). 201. Prop. XIII.—If a prismatic vessel receive a constant supply, less however than that discharged, to find the time that the surface will take to fall through a given height. Let the letters stand for the same things as before, and fur¬ ther, let the volume of water entering the basin in one second be q, and x the height through which the water descends in a given time t, then dx will be the height in the infinitely small time dt, and Adx would represent the volume during the time dt if the vessel received no supply; but since in one second it receives a supply q, it will in time dt receive qdt of a supply. Therefore the actual discharge during time dt = Adx + qdt •, but this same volume (by 181) is expressed by mSdt tJ2g(tt. - x); hence Adx + qdt=mSdt V2g(Yi — x) ; let H —x = h, then —dx = dh, since H is constant. Wherefore, , , „ . — Adh — Adh qdt — Adh = mSdtV2qVh ; .'. dt~ , __ mSV2gVh-q V where m$V2gVh —q=y: by differentiating, we have, wiS\/ 2g dy — — ; or, dh- dh 2\/h. dy __ 2dy / y + q \ _ 2\^h dh mS\/2g mS\/2g\mS\/2g/ ’ ,. dt=z^+3)= -z±.(dy+jlA m2S2<7 y.m2h2g m2S2g\ y J Therefore, A =^/(-+*7); +« hw- ‘"e- +c- Since when ^ = 0, x = 0, and so H will = A; A C= (y + q hyp. log.y), and by substitution 2 A m2 SV/v (mS,V2gj2 ^ mSV'%VH - ? + 9- hyp. log. (mSv'2SrVH - 9) }; Therefore t = 2A imS\/ 2g)i 2A »SV^r)2 2A Pig. 48. ^mSV2g\/h — q + q hyp. log. (mS-v/2g\/A — 9)^ ^m'&\/2g\/il — q+q hyp. log. (mS-v/^VH —9)^ - —^7=^ ( mSV%(A/ lT- Vh-) + 9 hyp .log/ (t»sV-9)2 \ -v ;-r9 yp *\msV2gVh_qJ)- Make 9 = 0, then the expression becomes identical with 196. 202. If the converse question were required, viz., given the time, to find the height to which the level of the water would descend; we should be doing the same thing as if we were to determine the charge A at the end of the given time, and deduct it from H, the head at the beginning of the charge. In order to find A, successive values of it, i.e., H—x, must be substituted in the above equation, and by the process of trial and error, that value which satisfies the equation will be the one required. HYDRODYNAMICS. 109 Motion of 203. Prop. XIV.—To find the time of discharge from a Fluids, &c. vessel other than prismatic. The determination of the time in this case is much more complicated than for any other form of vessel, and it is sometimes impossible. The fundamental equation, how¬ ever, for this purpose is , A . dx K.dx— mSdt\l2g (H — a?) ; r. dt=^j==~-' The form of the vessel, or a horizontal section a of its area, is variable. In order, therefore, that the above value for dt may be integrable, a must be known in terms of x, which can only be the case when the interior curvature of the basin is given. If this cannot be ascertained, we must proceed by approximations and by parts. For this pur¬ pose, the basin must be divided into horizontal sections of small depth, each of which is to be regarded as a prism, and the time determined that any one of these takes to pass out, making use of the above-mentioned formulae. The sum of all these partial times will give the required time that the surface takes to descend a height equal to the sum of the heights of the prisms. 204. Prop. XV.—Water is discharged from one reservoir into another, find the volume discharged and the time required to fill up to different levels in one of the reservoirs. Three cases will require to be considered. First Case.—Suppose the orifice covered with water on both sides or faces, the levels in the reservoirs M and N (fig. 49) remaining constant; then, since the charge is H — h, where H is the charge for M, and h that for N, the vo¬ lume discharged will be the same as if it had issued out into the open air with a velo¬ city equal to the difference of the charges on each face. Hence, volume discharged in one unit, as a second, is Q= Fis-49- »*S\/2<7 (H — A), where again S or mS is the area of the orifice. Second Case.—Let the level in M, the upper basin, be constant, while the lower basin N of a given area receives it without any loss, to determine the time that the level of N will reach the level of the upper basin, or a given height. This problem is the converse of 196, where the discharge took place in air, and the surface of the water above the orifice descended with a uniformly retarded motion. Here, however, the surface of the basin is urged from below up¬ wards by a force equal to the difference between the levels of the two basins, decreasing in the same proportion as the charge decreased in the former case, but at the same time, rises with a motion uniformly retarded, and it will require the same time to traverse the same space, under these similar pressures. Suppose, then, that H is the pressure or charge AC, at the commencement, and h the charge at the end of the time t; let also A be the horizontal section of the vessel being filled up, and m and S as before. In order, therefore, that the water may fill N up to DE, if = 2 A J'2g {x—y) (by 181); the one being positive while the other is ne¬ gative ; hence dt= ~v ^ence also^Aefcr = -/ ms*J'2g('X—y') B.dy, or Ax + By = AH + B^, since in the limit A {H-x) x = H, and y=h; B + h. Let this value for y be substituted in the value for dt, and we have dt= Adx AV I* dx sV 2c ( *" AH + BA —AaA ms\/2g\^(S> +A^x—Ati. — 2AVB , | y/B (H-A)-VYA + B) a—AH —BA [ ms V 2g (A + B) l v J -r ; ) by integration ; since a? = H in the limit, and £ = 0. Let the time required be now that in which the levels of K and L form a straight line, then x=y; AH + BA (A + B)*=:(A + B)2/=:AH + BA; or, x=y=- A + B and if this value of x be substituted in the value of t, we , 2ABVH^1 have t= .=•. Hence, for the same value of msj2g(A + B) (H — A), t is the same whether A be the horizontal section of the basin that lowers, and B that of the other, the sur¬ face of which rises, or vice versa, B that which falls, and A that which rises. 205. Prop. XVI.—To find the velocity and volume dis¬ charged, of water issuing from an orifice in the side of a vessel, when the fluid has an antecedent velo¬ city. When water is continuously poured into a vessel contain¬ ing fluid, or if the water in the vessel be moving in the direction of the orifice, then, the particles will approach to and issue from the orifice in virtue of the pressure of the fluid mass above it, together with the additional velocity that they had while they entered into the sphere of action of the orifice. Therefore, the additional velocity will be that arising from the height of a column, which would exert the same effect as that which the fluid previously had. Let 110 HYDRODYNAMICS. Ijl Motion of jjjjg velocity be equal to u. which is -—, or that due to the Fluids, &c. J 1 2g height of a column li; call the depth of the fluid A, then the velocity of efflux for one particle or thread will be that due to the vertical height h + K. Hence, velocity of escape is V = s]2g {h + h) = \J2g (ji + = >j2gh + ii\ Call S, or w . S, the area of orifice, then volume discharged in a unit of time is Q — mSs/2gh + ui =/n S\X ^ + ' the volume discharged in T units of time will be, Q.F, or Q'=mST. a/2g(h +~). 206. Cor.—Take A'= 34 feet, or a water column which would balance the atmospheric column, then V = (A + 34), which expresses the velocity with which water is projected into a vacuum, the column being A. 207. Prop. XVII.—If two cylindrical vessels be filled with water, the times in which the fluid surfaces will fall through given heights will be directly as the com¬ pound ratio of their bases, and the difference between the square roots of the altitudes of each surface at the beginning and end of its motion, and inversely as the areas of the orifices. Let A and A' be the areas of the cylindrical vessels, a and d the spaces passed through by the fluid surfaces in the corresponding times T and T', a being = H — A; a' = H' — A'; where H, H' and A, A' are the heights of the fluid surfaces respectively at the beginning and end of the times ; S and S' or mS and mS' the areas of the orifices of A and A', the co¬ efficients being regarded as equal: then, by Prop. X. 196, T=?4- -7= (VH-VA), and T'=-^4(*/H'- a/A); wS *J 2g mh n Wh hUH’ ~ v'/° = ^-(VH - Jh) = ^ (VH' - V/.'j. 208. Cor.—Hence the time in which two cylindrical ves¬ sels full of water will empty themselves, will be directly as the compound ratio of their bases, and the square roots of their altitudes, and inversely as the areas of their orifices. For, in the last article, VA = VA'=0, therefore, T:T' = 4VH O O which is the same ratio as would have been obtained had we used the formula of Prop. IX. 194. 209. Prop. XVIII.—To find the horizontal distance to which water will spout from an orifice made in the side of a vessel, when projected horizontally. Let AC be the vessel full of fluid ; suppose that N is an orifice in its side, at a depth BN below AB ; NT the path of the jet. Let also v be the velocity with which water issues from N, and t the time of its falling down the perpendicular distance NC. Then ^ /2. NC Motion of v=J2g. BN (Prop. I. 177), and t=W ~—• Fluids, &c. But the time that the body takes to move in the parabolic ^ -r path NT, is the same as its falling down through NC; hence CT=p.<=V2^.BN. \/^p=2 VBN.NC. Now, if we describe a semicircle on SC as diameter, we have (by Euc. III. 35) BN . NC = NG2, where NG is perpendicu¬ lar to SC; wherefore CT = 2 NG; that is, the horizontal dis¬ tance or range is twice GN, the ordinate of the semicircle. 210. Cor. 1.—The horizontal range will evidently be a maximum when the orifice is at the middle point Q of the diameter; and, therefore, the range will in this case be equal to the height of the vessel, or BC = CT. 211. Cor. 2.—If the orifice should be at n, and Sra = NC, then the jet will assume the path nT, and its range will be CT, the same as when the orifice was at N. 212. Cor. 3.—If the orifice be at C, and the direction of projection be CG, inclined to the horizon at an angle of 45°, then we shall have the greatest range, CK, that the fluid vein can possibly take when projected under the charge SC. 213. Cor. 4.—If the direction of projection be Cg> in¬ clined at an angle of 75° to the horizon, its range will also be CK. 214. If the inclination be either less or more than 45° or 75° respectively, the ranges will be less than CK; resistances and all retarding causes whatsoever being neglected. R and r are called the greatest heights of the paths CrK, and CRK respectively, being the middle points of these paths. 215. Prop. XIX.—If water flow through a pipe which is kept constantly full, then the velocities of the fluid particles in different sections will vary inversely as the areas of these sections. It is presumed that each particle in the same transverse section has the same velocity. Let then Q = volume of fluid passing through any portion of the pipe in one second, and v = the velocity of water in the same time while pass¬ ing through that section of the pipe the area of which is a. Hencea.v=Q; .'. v=— x —, since the volume passing a a through every second is constant. 216. Cor.—The volume which passes through the pipe in a time T = a. v. T. 217. Prop. XX.—To determine the pressure exerted upon pipes by the water which flows through them. Let us suppose the column of fluid CD divided into an in- Fig. 52. finite number of laminae EF,/e. Then friction being ab¬ stracted, every particle of each lamina will move with the same velocity when the pipe CD is horizontal. Now, the velocity at the vena contructa, inn, may be expressed by ^A, A being the altitude of the fluid in the reservoir. But the velocity at the vena contracta is to the velocity in the pipe as the area of the latter is to the area of the for- HYDRODYNAMICS. Ill Motion of mer. Therefore, S being the diameter of the vena eon- Fluids, &c. tracta, and d that of the pipe CD, the area of the one will be to the area of the other, as S2: d1 (Geometry, Sect. VI. Prop. IV.), consequently we shall have d1: S2=^/A : g2 ./A , the velocity of the water in the pipe. But since the velocity a/ A is due to the altitude A, the velocity SVA t j 84A - will be due to the altitude —tt—. Now, as each a2 a1 particle of fluid which successively reaches the extremity DH of the pipe, has a tendency to move with the velocity JA, while it moves only with the velocity , the ex¬ tremity D« of the pipe will sustain a pressure equal to the difference of the pressures produced by the velocities VA , SVA , . , . 84A A and - ^ —, that is, by a pressure A A represent¬ ing the pressure which produces the velocity VA, and S4A , i • u i . . . SVA the pressure which produces the velocity —^—. But this pressure is distributed through every part of the pipe CD, consequently the pressure sustained by the sides S4A of the pipe will be A — -^r. 218. Cor. 1.—If a very small aperture be made in the side of the pipe, the water will issue with a velocity due to the S4A When the diameter 8 of the orifice is Fluids, &c. height A — ^ equal to the diameter d of the pipe, the altitude becomes A — A or nothing; and if the orifice is in this case below the pipe, the water will descend through it by drops. Hence we see the mistake of those who have maintained, that when a lateral orifice is pierced in the side of a pipe, the water will rise to a height due to the velocity of the included water. 219. Cor. 2.—Since the quantities of water, discharged by the same orifice, are proportional to the square roots of the altitudes of the reservoir, or to the pressures exerted at the orifice, the quantity of water discharged by a lateral ori¬ fice may be easily found. Let W be the quantity of water dis¬ charged in a given time by the proposed aperture under the pressure A, and let w be the quantity discharged under the . 8lA w /A /~ ^A. pressure A— ihen W : w = \'A : y A consequently, w x dx VA — W x sj A - and w = Wx JA- 8‘A . A — = W —-jr—-. Therefore, since W may VA dl ' i be determined by the experiments in the following chapter, w is known. CHAPTER II.—ACCOUNT OF EXPERIMENTS ON THE MOTION OF FLUIDS DISCHARGED FROM VESSELS, EITHER BY ORIFICES OR BY ADDITIONAL TUBES, OR RUNNING IN PIPES OR OPEN CANALS OR RIVERS. 220. We have already seen in our theoretical part (from 169 to 214), that the reservoir, out of which issues the water, may be always maintained at the same level; or, re¬ ceiving no supply, may be exhausted ; or, lastly, the escape, instead of taking place in air, may do so into another reser¬ voir more or less full. These are the three principal cases to which experimenters on this subject have generally turned their attention. Before detailing any experiments, let the following im¬ portant definitions be remembered :— 221. Water may escape from a vessel, reservoir, or tank, by a horizontal opening in the bottom or in one of its late¬ ral sides ; when the latter is the case, the opening is known as an orifice. The orifice is frequently said to be in a thin plate or wall, that is, in a wall the thickness of which is scarcely one-half the least dimension of the opening ; it is also at times furnished with an adjutage, or short pipe, either cylindrical, or conical, converging towards, or diverg¬ ing from, the basin. It is clear that an orifice in a thin wall, but furnished with a pipe, would be equivalent to an orifice in a thick wall. When the upper border is away, and the issuing fluid is in contact with the containing vessel on three sides only, the orifice is then said to be a deversoir, a notch, a weir, or waste-board; such are the waste-boards of canals and reservoirs, and weirs in rivers, which may be seen stretched across their course, so that the water being intercepted by them, must rise and flow over the crest or summit. A fluid vein in passing through a complete open¬ ing suffers a contraction, the phenomena of which will be fully explained in the following pages. The vertical dis¬ tance of the fluid surface in the vessel above the centre of gravity of the orifice, is called the height of the reservoir, or the charge of water over the orifice, or it is that charge under which the escape takes place. The waste, or real effective waste of an orifice, is that vol¬ ume of fluid discharged in one unit of time, as a second. The theoretical waste is that volume per unit of time which theory assigns. The former is always less than the latter. The quotient or ratio of the real to the theoretical waste is termed the coefficient of contraction, or that fractional number which multiplies the theoretical to obtain the real waste. 222. Mariotte, 150 years ago, showed that in the case offluids the velocities are as the square roots of the charges (Cor. 1. Prop. VIII.) Many succeeding experiments have proved the same principle, and although it is not rigidly true, it may still be admitted. The following table of results will exhibit the propor¬ tionality. The charges are as 1 :200 and more, and the section of the orifices are as 1 : 500, still in each the velocity has followed the square root of the charge ; minute errors, causing small differences, arise, but these may be neglected. Such experiments have for their object the determination of the waste per unit of time; but it is clear that so long as the orifice remains of the same area the discharge or waste is exactly proportional to the velocity; and, therefore, a column denot¬ ing the relations of the one, must also give those of the other. Observes. Diameter of orifice in metres. Charge above orifice Series of Roots of charges. Wastes or velocities. Daubisson and Castel. Bossut Michelotti. Poncelet and Lesbros.. 0-01 0-027 0081 0-162 } Square of 20 cent!-, metres... 1-000 1-074 1-241 1-386 1-509 1-000 1-500 1-713 1-000 1-305 1-738 1-000 1-316 1-000 1-323 1-581 1- 803 2- 000 1-000 1-064 1-244 1-393 1-524 1-000 1-497 1-707 1-000 1-301 1-692 1-000 1-315 1000 1-230 1-590 1-806 2000 112 HYDRODYNAMICS. Motion of 223. It has been shown by experiment that the princi- Fluids, &c. pie bolds for all fluids whatever, as mercury, oils, See., and even for aeriform gases; so that any one of them issuing from an orifice will do so with a velocity independent of the nature and density of the substance ; it will only de¬ pend on the charge. The same principle has also been de¬ tected in the case of discharges in vacuo, as well as in the at¬ mosphere ; the velocity will always be the same with the same head, whatever be the pressure on the free surface ot the fluid, provided only that the jet at the orifice is also sub¬ jected to an equal exterior pressure. But if these pressures be unequal, then the velocities differ. 224. We have seen (in 173) the relation of the several parts of the contracted vein to each other ; it may be inter¬ esting to know the values which the older experimenters gave for the same parts. Newton concluded that the ratio of the contracted section op (fig. 43), and the area of the ori¬ fice mn, was 1 : V 2, and consequently that the diameters of these sections respectively were as 0841 : TO. If mn be 1, Poleni found that ojo would be 0’79; Borda, 0,804; Michelotti, 0‘792 ; Bossut, fromO‘812 to 0*817 ; Eytelwein, 0*80; Venturi, 0*798 ; Brunacci, 0*78. The mean of all these values for the same thing, op, is 0*80. But from a mean of more recent experiments by Ignazio Michelotti, the son of F. D. Michelotti, we have the relation of 1 to 0*787 as the ratio of the area of the orifice and that of the contrac¬ ted section. Since the latter experiments are regarded as very accurate, Daubisson has followed the ratio 1 : 0*787. 225. Were the velocity at the contracted section really that due to the height of the reservoir, and were the escape to take place through an adjutage of the same form as the contracted vein, then on introducing into the expression for the waste the area S of the exterior orifice of this adju¬ tage, the calculated would be equal to the actual waste, and the ratio of the coefficients would be 1. Michelotti,1 in one of his experiments, employed a cycloidal adjutage, and obtained a coefficient of 0*984. In all probability he w*ould have arrived at 1, if the walls of the adjutage had been more accurately adapted to the form of the fluid vein, and if the resistance of these walls, and also that of the air, had not somewhat retarded the motion. 226. The coefficient, or the ratio mentioned above, is not always a constant quantity. It varies with the form and position of the orifice, with the thickness of the plate in which the orifice is made, as well as the form of the vessel and the weight of the superincumbent fluid. This variable quantity, therefore, must not be neglected in practice. SECTION I. ON THE VOLUME OF WATER DISCHARGED FROM VESSELS KEPT CONSTANTLY FULL, BY ORIFICES IN THIN PLATES. (a.) Flow of Water through an Orifice in a Thin Plate. 227. We proceed now to determine directly that frac¬ tional number, or coefficient, which will enable us to reduce the theoretical to the actual waste. As this is a mere ten¬ tative process, we must gauge with care the volume of water flowing out of a given orifice, under a constant charge, and in a given time, from which is found the vol¬ ume in one second, or the real waste for that time; on di¬ viding this by the volume which theory gives as issuing from the same orifice, and under the same circumstances, we find the coefficient required. Thus, let the orifice be 3*185 inches in diameter, then the head of 4*012 feet of water issues out of it with a velocity of 16*07 feet per second. Now, area of orifice = 7r.r2 = (3*1416) (T5925)2 «= 7*97 square inches, which, if multiplied into the velocity of each particle of water, or 4*012, gives the volume of a Motion of prism or cylinder equal to that of the water discharged, or Fluids, &c. . (16*07) = *8894 cubic feet per second. But the real ^ discharge in 1^ minutes was found to be 49*68 cubic feet, which is at the rate of *552 cubic feet per second ; hence, 0*552 coefficient 7^ = 0*620. A considerable number of 0*8894 experimental philosophers since the time of Newton have endeavoured to determine its true value. Daubisson, in his Traite d'Hydraulique d Vusage des Ingenieurs, 1840, gives a table containing the principal results which several emi¬ nent experimenters have arrived at. They include circu¬ lar, square, and rectangular orifices :— Circular Orifices. Observer. Mariotte... Do. ... Castel Do Do Do Eytelwein Bossut Michelotti Castel Venturi.... Bossut Michelotti Do. ... Do. ... Do. ... Do. ... Do. ... Dia¬ meter. Metres. 0-0068 0-0068 o-oi 0-01 0-015 0-015 0-261 0-271 0-0271 003 0-041 0-054 0-054 0-081 0081 0-081 0-162 0-162 Charge. Metres. 1-79 7-90 0-65 0-31 0-138 0-30 0-723 1- 30 2- 23 0-168 0-88 3- 81 2-20 2- 24 3- 81 6-76 211 3-66 Coeffi¬ cient. 0-692 0692 0 673 0-654 0-632 0*617 0-618 0-619 0-618 0-629 0-622 0-618 0-607 0-613 0-612 0-597 0-619 0-619 Square Orifices. Castel.. Bossut.. Michelotti Do. ... Bossut Michelotti Do. ... Do. ... Do. ... Do. ... Do. ... Side of square. Metres 001 0-027 0-027 0-027 0-054 0-054 0-054 0 054 0082 0-081 0-081 Charge. Metres. 0-05 3-81 3-81 6-83 3-81 224 3-83 6-78 2-26 3-83 6-82 Coeffi¬ cient. 0*655 0-616 0-607 0-606 0-618 0-603 0-603 0-602 0-616 0-619 0-616 Rectangular Orifices. (Bidone.) Rectangle. Height, Base, 0 0092 0-0092 0-0092 0-0092 0-0185 0-0370 0-0739 0-1478 Charge. 0-33 0-33 0-33 033 Coeffi¬ cient. 0*620 0-620 0-621 0-626 The most remarkable of these experiments, of which the above table is the result, were those of the elder Michelotti, performed in the year 1764, at about 3 miles from Turin. The internal dimension of the reservoir was a square of 0*97 met., and 8 met. in height; it was supplied with water from the River Dora by a canal of derivation. On one of the faces of this reservoir w as arranged a series of adjutages at different, yet convenient depths; on the surface of the ground, also, were arranged different vessels for measuring the actual discharges. Ignazio Michelotti performed these same experiments in 1784, the results of which—the five last—are tabulated as above. It will be observed from the table that the coefficients from the large orifices are higher than the others, although contrary to the rule that would be deduced from the experiments in general; some parti¬ cular circumstance must have produced this anomaly.2 With respect to the experiments of M. Castel, engineer to the Water-works of Toulouse, they were carried on by him in company with M. Daubisson at Toulouse, and in spite of all the care which they took in their operations, the small¬ ness of the orifices would only permit them to come within -jJ^th of the value of the coefficient. They principally occupied themselves on the orifice 0*01 met., as being in a manner the starting point in a distribution of water, made after the metrical system of weights and measures. 228. In the year 1782, the engineer Lespinasse made several experiments in the canal of Languedoc, in order to to determine the coefficient when water issues from a sluice-gate. The width of the sluice was 1*3 met., the area 1 Memoire Physico-Mathematique contenant les resultats d'experiences Hydrauliques. Pans les Mlmoires de VAcademie des Sciences de Turin, 1784-1785. 2 Sperimenti Idraulici, ony :— Comparison of the Theoretical with the Real Discharges Experi- from a Cylindrical Tube one inch in Diameter, and, ments on two inches lonq. t*le Motion of Fluids. Constant alti¬ tude of the wa¬ ter in the re¬ servoir above the centre of the orifice. Paris feet. 1 2 4 6 8 10 12 14 1 Theoretical discharges through a cir¬ cular orifice one inch in diameter. Cubic inches 4381 6196 8763 10732 12392 13855 15180 16393 2 Real discharges in the same time by a cylindrical tube one inch in diameter and two inches long. Cubic inches. 3539 5002 7070 8654 9975 11151 12205 13177 3 Ratio of the theoretical to the real dis¬ charges. 1 to 0-81781 1 to 0-80729 1 to 0-80881 1 to 0-80638 1 to 0-80496 1 to 0-80483 1 to 0-80403 1 to 0-80382 4 By comparing the preceding table with that in art. 235, we shall find that cylindrical tubes discharge a much greater quantity of water than simple orifices of the same diameter, and that the quantities discharged are as 81 to 62 nearly. This is a curious phenomenon, and will be afterwards explained. 246. The application of this table to other additional tubes under different altitudes of the fluid not contained in the first column, is very simple. Let it be required, for example, to find the quantity of water discharged by a cylin¬ drical tube 4 inches in diameter and 8 inches long, the alti¬ tude of the fluid in the reservoir being 25 feet. In order to resolve this question, find (by art. 237) the theoretical quantity discharged, which in the present instance will be 350490 cubic inches, and this number diminished in the ratio of 1 to 0'81 will give 284773 for the quantity required. The length of the tube in this example was made 8 inches, because, when the length of the tube is less than twice its diameter, the water does not easily follow its interior circum¬ ference. If the tube were longer than 8 inches, the quan¬ tity of fluid discharged would have been greater, because it uniformly increases with the length of the tube; the greatest length of the tube being always small, in compari¬ son with the altitude of the fluid in the reservoir. 247. When the cylindrical tube is two inches long, and its diameter one, the water will fill the tube, and issue in threads parallel to the axis of the orifice ; the vein also will cease to contract, and the diminution of the discharge can only take place from a diminution of the velocity ; the ratio, then, of the actual to the theoretic discharge will be the same as that of the actual to the theoretic velocity. The follow¬ ing table lets us see this :—- Observer. Jet. Absciss. Ordin Velocity. Real. Theo¬ retic. Coefficient Of Ve- Of locity. Waste. Venturi, Castel..,, Castel.... Met. 1-462 0-546 1-140 Met. 1-868 0-673 1-769 Met. 3-415 2- 017 3- 669 Met. 4-154 2-426 4-414 0-824 0-832 0-832 0-822 0-827 0-829 From the above table we see that the coefficients of dis¬ charge and velocity are sensibly equal. It appears, also, that the velocity of a jet issuing from a cylindrical adjutage is equal to 082 of that due to the charge or height of the reservoir ; and that the height due to the velocity of exit is only (•82)2 = '6724 of the last; since the heights of the charges are as the squares of the velocities. 248. The coefficient, it will be perceived, has risen from 062 to 0*82, the cause of which, together with the increased HYDRODYNAMICS. 117 Experi- waste, are probably due to the following circumstances, ments on The fluid vein, after its contraction, on entering the addi- the Motion tional adjutage, tends to assume and preserve a cylindrical of Fluids. form t]ie section of which will be that of the contracted vein,’ and consequently it tends to issue without touching the walls of the cylindrical tube. Some fillet threads, how¬ ever, move towards these walls, owing either to some diver¬ gence in their direction, or to some attractive force, or to both combined. When a contact of fluid particles takes place at the walls, then they are strongly held by molecular attraction; and the same force causes particle to cling to particle, even over the whole vein, which issues from a full pipe, and passes quickly by the contracted section. The immediate cause, however, is contact, and eveiy circum¬ stance which favours that will tend to produce an augmen¬ tation in the value of the coefficient and volume discharged. The principal of these circumstances are :—1. The length of the tube ; the longer it is the greater is the tendency to contact; the less it is the less is that tendency. 2. A feeble velocity ; the fluid threads will then be drawn with oreater facility towards the walls. 3. The affinity of the matter of the tube for the fluid, or rather its disposition to be more easily wetted. 249. Venturi made several ingenious experiments on cy¬ lindrical adjutages, piercing the thin plate of a reservoir, the orifice of which was in diameter 0-0406 met. ; and under a charge of 0‘88 met. he obtained a volume of 0-137 cub. met. of water in 41 seconds, fo this simple orifice he next adap¬ ted a cylindrical pipe, not continued beyond the narrowest part of the vein, and having a form very nearly the same ; the diameter of the contraction being 0-032 i met., and its distance from the orifice 0"02o ; and under the same charge be obtained the same volume, but now in 42 seconds. To this first pipe he added a continuation beyond the conti acted part, of the same dimensions as the orifice, and to obtain the same volume under the same head, the time required was only 31 seconds. Lastly, to the orifice he fitted on a uni¬ form pipe of the same length as in last experiment, and the volume escaped in 31 seconds was 0-137 cub. met. It appears, then, that the introduction of a cylindrical ad¬ jutage does not diminish the contraction, but makes the fluid5 pass by the contracted section with a greater velocity in the ratio of 31 :41 or 42 ; and hence the augmentation of the waste. Venturi attributed the cause of the above to an excess of the atmospheric pressure on the fluid surface contained in the reservoir, an excess arising from a void in that part of the adjutage where the greatest contraction takes place. He endeavoured to prove this by many very interesting experiments, but his results have been too much generalized. Two of the most beautiful experiments of Venturi are explanatory of what he termed the lateral communication of motion in fluids} (y.) Flow through Converging Conical Adjutages. 250. The investigations on pipes of this kind were up to 1838 very inexact and imperfect. Four experiments made on this subject by the Marquis Poleni, are recorded in his I)e Castellis per quce derivantur Fluviorum Aqua (1 i 18), and cited by Bossut in his Hydrodynamique. Their ac¬ curacy, however, was doubted by Daubisson, and this cir¬ cumstance, together with the paucity of results on converg¬ ing conical adjutages, determined him, along with Castel, to project a series of experiments which we shall notice pre¬ sently. With respect, however, to very large conical adju¬ tages, or rather pyramidal nozzles, employed for the pur¬ pose of putting hydraulic wheels in motion (458), we have three very accurate experiments of the engineer Lespin- asse on the mills of the canal of Languedoc.1 2 The nozzles the Motjon in these experiments were frusta of a rectangular pyramid, 0f fluids, having a length of 2-923 met, the greater base 0-731 by 0-975 met., the smaller base 0T35 by 0-190 met. The opposite faces were respectively inclined at angles of 11 38 and 15 18 , and the charge was 2*923 met. 1 he two first experiments, of which the results are here given in a tabular form, were made on a mill with two millstones, furnished each with a separate wheel. In the first experiment the water was only given to a single wheel, but in the second it was given to both at once. Such adjutages were found to di¬ minish the waste very little, the real differing from the theoretic waste by between 100th and 200ths of the latter. 251. As in this adjutage there are two contractions (171), the formula given in Prop. II. (181), to calculate the waste for a single contraction is inapplicable in the present case. Let n be the exterior contraction, or the ratio of the con¬ tracted section of the fluid to that of the orifice, and n the coefficient of the velocity, or the ratio of the real to the theoretic velocity, mi will be the coefficient of the waste, or the ratio of the real to the theoretic waste. Let S re¬ present the sectional area of the orifice, V the velocity due to the charge, the real waste will be expressed by the formula rcS . w V = m/SV = wn'SV2s-H (Prop. II. 181). The quan¬ tities n and ri are found by experiment. The coefficients of velocity and discharge find a very important application in the case of jets of water, as in fire-engines (517) and fountains. 252. To determine these coefficients, and specially to de¬ termine the angle of convergence which would cause the greatest discharge, a variety of adjutages were submitted to experiment by M. Castel, in each of which the diameter of the orifice of issue and the length of adjutage remained constant; but the diameter of entrance, and consequently the angle of convergence, gradually increased. The flow was produced under different charges for each adjutage. At every ex¬ periment the real waste was determined by direct gauging, and the velocity of escape by the method of the parabola (Prop. I. 177). The waste divided by SV gave nn ; and the observed velocity divided by V ( = ^/2^H) gave ri. The series of numbers for nri showed the waste corresponding to each angle of convergence, and consequently the angle of maximum waste; and the series of numbers for ri indi¬ cated the progression by which the velocities increased. 253. So early as 1831, M. Castel had, with a very small apparatus, and under feeble charges, made a series of ex¬ periments on adjutages of this nature. The results were detailed in the Annales des Mines for 1833. In 1837 he renewed his experiments, and considerably extended his labours by means of the beautiful experimental apparatus at the Water-house of Toulouse. 254. This apparatus consisted of a rectangular metal chest, 0-41 met. long, 0-41 broad, and 0-82 deep, communicating by a pipe with a reservoir kept constantly full, and 9 met. above the chest; the different adjutages were fitted into one of the walls of the latter vessel. A rectangular opening was made, and pipes were so arranged round its sides, that charges of 0-20, 0-50, PO, 1-50, 2-00, and 3 met. above the experimental adjutage, could easily be procured. The adju¬ tages were of two kinds; the diameter of one set was 0-0155 met., and about 0-040 met. in length; andthediameter of the other was 0"020 met. and 0-050 met. in length. For the pur¬ pose of determining very exactly the velocity of issue from the adjutage, M. Castel set up a horizontal plate or floor, in the centre of which was a groove 0T0 met. wide, into which Coefficient. Cub. met. 0-1916 0-1895 01901 0-987 0-976 0-979 1 See Recherches Experimentales sur la Communication Laterale du Mouvement dans les Fluides, 1797. 2 Anciens Memoires d VAcademic dc Toulouse, tom. ii., 1784. 118 hxperi- the jet passed ; its range was measured by means of a gra- ^uatec^ ru^e fixe(l to, and very near the plate. This power of Fluids" Was ^le orfl‘nate of the path described by the jet; 1*140 v. met* the absciss ; and from these two co-ordinates the velocity of projection was deduced by 177. 255. The same adjutage, under charges which varied from 0*21 to 3*03 met., gave wastes proportional to ^/H, and consefjuently coefficients which were sensibly the same. A slight increase will be observed under the charge of 3 met.: II Y D Ti O D Y N A M I c S. Adjutage of 00155 met. Charge. Met. 0-215 0-483 0-992 1-492 2006 3-030 Coefficient of Waste. 0-946 0-946 0-946 0-947 0-946 0-947 Velocity. 0-963 0 966 0-963 0-966 0-956 Adjutage of 0-020 met. Charge. Met. 0.211 0-483 0-995 1- 498 2- 008 3-030 Coefficient of Waste. 0-956 0-957 0-955 0-956 0-956 0-957 Velocity. 0-966 0-968 0-965 0 962 0-959 The higher charges are given in the tables for each series of diameters which have furnished the maximum waste. With respect to the coefficients of the velocity, they would have also been sensibly the same had it not been for the resistance of the air. As this resistance diminishes the throw or range of the jet, and increases as the charge increases, we should expect in the calculated coefficients a diminution varying w-ith the charge, although in reality there was no actual diminution in the velocity with which the fluid issued or tended to issue. In the following table we compare the coefficients both of the waste and of the velocit\7, obtained by the same series of adjutages, which differed only in their angle of convergence. Five or six different coefficients obtained from five or six different charges, very nearly the same, have been taken so as to determine a mean coefficient:— Adjutage, 0-0155 met.in diameter. Adjutage, 0-0200met. in diameter. Angle of Convergence, Deg. min. 0 36 10 10 26 52 8 58 10 20 12 4 13 24 14 28 16 36 19 28 21 0 23 0 29 58 40 20 48 50 Coefficient of Waste. Velocity. 0-829 0-866 0-895 0-912 0-924 0-929 0-934 0-938 0-942 0-946 0-941 0 938 0-924 0-918 0-913 0-896 0-869 0-847 0-830 0-866 0-894 0-910 0-920 0 931 0-942 0-950 0-955 0-962 0-966 0-971 0-970 0-971 0-974 0-975 0-980 0-984 Angle of Convergence. Deg. min. 2 50 5 26 6 54 10 30 12 10 13 40 15 2 18' 10 23 4 33 52 Coefficient of Waste. Velocity. 0-914 0-930 0-938 0-945 0-949 0-956 0-949 0-939 0-930 0-920 0-906 0-928 0-938 0-953 0-957 0-964 0-967 0-970 0-973 0-979 256. From the facts here tabulated it follows,—!. That oi one and the same orifice of issue, and under the same charge, beginning with 0-83 of the theoretical waste, the actual waste gradually increases in proportion as the an^le of convergence increases, but only up to 131°, where the coefficient is 0*95. Beyond this angle it diminishes, slowly at first, like all variables about the maximum ; at 20° the coefficient is about 0*92 or 0*93. But after this the di¬ minution becomes more and more rapid, and terminates as Expert, low as 0‘65, which is the coefficient for an orifice in a thin ments on p ate, this last being the limiting position of converging t*16 Motion adjutages, that, namely, in which the angle of convergence Flmds. has attained its maximum value of 180°. Hence, then, the maximum waste will be obtained with a converging adjut¬ age of from 13° to 14°. 257. The explanation of this is probably the following: — In conical adjutages the theoretical waste is altered by the attraction of the walls, which tends to augment, and the con¬ traction which tends to diminish it, by diminishing the sec¬ tion of the vein a little below the issue. From the experi¬ ments of Venturi, it would appear that the fluid vein, at its entry into^the adjutage, preserves its natural form of a co¬ noid of 18° to 20°; so that the more the angle of adjutage approaches this value, and the nearer the walls are to the vein when, after experiencing its greatest contraction, it tends to dilate itself, and w hen it is wholly under the attrac¬ tive action of the walls, the greater will be the waste, and the maximum of counter action will give the maximum of waste. But, again, at 10° of convergence, the exterior con¬ traction begins to be sensible, and causes a diminution of the waste; it has already reduced it by five per cent, at 18 , and thus the angle of maximum waste should naturally be expected between these two values, or about 14°. The adjutages of 0-020 met. diameter of issue, gave co¬ efficients from T^oth to yfo^ls greater than the adjutages of 0*0155 met. An error of -j^th of a millimetre at least in esti¬ mating the diameter of the first would, in a great measure, account for this difference ; and the difference very likely arose from an error of this kind. The diameters of the second adjutages, however, were very correctly measured. 2. In regard to the coefficients for the velocity, we find them increasing from the angle of 0°, like those of the dis¬ charge, up to the convergence of 10° : beyond that point they increase more rapidly ; and when beyond the angle of maximum waste, whilst the waste diminishes the coefficients of velocity go on increasing and approach their limit 1. They are already nearly equal to 1 at 50°, and not far from it at 40°. Conical adjutages may, by their diverse con¬ vergence, form a progression, the first term of which is the cylindrical adjutage, and the last the orifice in a thin plate; the velocity of projection, increasing with the con¬ vergence, varies then from that of the tube additional up to that of a simple orifice, that is, from 0*82a/2^H up to */2gH. 3. Comparing the coefficients of waste with those of ve¬ locity, or the successive values of n ri and ri, and dividing the first by the second, we obtain the values for w, or the coefficients of the exterior contraction. As the angle in¬ creases from 0° up to 10°, the values of n are sensibly = 1, and consequently there is no contraction ; " and notwithstanding the convergence of the walls, the fluid molecules issued paral¬ lel to the axis. But beyond 10° the con¬ traction shows itself; it reduces more and more the section of the vein, and termi¬ nates by reducing it to an equality with that of the orifice in a thin plate, as is shown in the annexed table. An gle. 8° 15 20 30 40 50 180 1-00 0-98 0-95 0-92 0-89 0-85 0-65 Experiment having shown that cylindrical adjutages pro¬ duce their full and entire effect as respects waste, when their length is equal to 2J times at least their diameter, M. Castel fixed the length of the conical adjutage at about 2^- times the diameter of issue ; thus it was 0-040 met. for those of 0-0155, and 0*050 met. for those of 0*020, in order, as far as possible, not to complicate the results with the fric¬ tion of the water against the walls. In order, however, to determine the effect of elongation, he projected two other series for the adjutages of 0*0155 met.; in one the com¬ mon length was 0"03 met., and reckoned the minimum ; in HYDRODYNAMICS. 119 Experi- the other it was O'10 met., a very useful practical dimension, ments on These he did not complete. He had already, however, the Motion maf]e gome approximations to them : thus, for adjutages of of Fluids. q.o]55 met., he took five of the length of 0'0S5 met., and the result was 0’938 as the coefficient of waste; whereas with a length of 0,04 met. the coefficient was 0'936 : another adjutage, in length 0-03 met., gave 0,941 instead of 0-938 ; and one of0-024 met. in length gave 0'931 in place of 0-926; thus a diminution of the length has a slight tendency to aug¬ ment the waste. But, on the other hand, with adjutages of 0’020 met. the waste increases with the length ; thus, in lengths varying from 0*50 met. to 0*10 met., and angles under 11° 52', he had a coefficient of 0-965 ; under angles of 14° 12', one of 0"958 ; and under 16° 34', one of 0-950. It thus appears that the effect of the lengths of adjutages is far from being ascertained, and new experiments require to Experi- be undertaken to determine its full extent. the Motion of Fluids. (S.) Flow through Conical Diverging Adjutages. 258. W e have seen (in 172) that this adjutage was known to the ancient Romans, and that by it we obtain a larger flow in a given time than from any other pipe. Bernouilli studied the effects of these adjutages and subjected them to calcula¬ tion, and in one of his experiments found that the real velocity at the entry of the adjutage w as greater than the theoretical velocity in the ratio of 100 : 108; but it is to Venturi that we are principally indebted for the knowledge which we possess of the results which these adjutages give. The following is a table of results from Venturi’s experiments :— Quantities of Water discharged from Orifices of various forms, the constant Altitude of the Fluid being 32 "5 French, or 34"642 English inches. No. 2 3 4 5 6 7 8 9 10 Nature and Dimensions of the Tubes and Orifices. A simple circular orifice in a thin plate, the diameter of the aperture being l-6 inches A cylindrical tube 1-6 inches in diameter, and 4’8 inches long A tube similar to B (fig. 55), which differs from the preceding only in having the contraction in the shape of the natural contracted vein The short conical adjutage A (fig. 55), being the first conical part of the preceding tube. The tube D (fig. 55) being a cylindrical tube adapted to the small conical end A, mn being 3-2 inches long The same adjutage, mn being 12‘8 inches The same adjutage, mn being 25-6 inches The tube C consisting of the cylindrical tube of Exp. 2, placed over the conical part of A The double conical pipe E, a6r=ac=l-6 inches, cd=0'977 inches, e/=l-376 inches, and the length ce of the outer cone :=4-351 inches The tube F, consisting of a cylindrical tube 3‘2 inches long, and 1-376 inches in diameter, interposed between the two conical parts of the preceding Time in which 4 Paris cubic feet were discharged. Paris cubic inches discharged in a minute. Seconds. 41 31 31 42 42-5 45 48 32-5 27- 5 28- 5 Inches. 10115 13378 13378 9874 9758 9216 8640 12760 15081 14516 259. It appears from these experiments of Venturi that when water is conveyed through a straight cylindrical pipe of an unlimited length, the discharge of water can be in¬ creased only by altering the form of the terminations of the pipe ; that is, by making the end of the pipe A (fig. 53), of Fig. 53. the same form as the vena contracta, and by forming the other extremity BC into a truncated cone, having its length BC about nine times the diameter of the cylindrical tube AB, and the aperture at C to that at B, as 18 to 10. By giving this form to the pipe, it will discharge more than twice as much water in a given time, the quantity discharged by the cylindrical pipe being to the quantity discharged by the pipe of the form ABC, as 10 to 24. 260. M. Venturi also found that the quantities of water discharged out of a straight tube, a curved tube forming a quadrantal arc, and an elbowed tube with an angle of 90°, each branch having a horizontal position, are to one an¬ other nearly as the numbers 70, 50, 45. Hence we see the disadvantages of sinuosities and bendings in conduit pipes. In the construction of hydraulic machines, any variation in the internal diameter of the pipe ought to be carefully avoided, excepting those alterations at the extremities which we have recommended in the preceding paragraph. 261. In one of his experiments Venturi employed a mouthpiece identical to that in fig. 53, and not unlike the form of the contracted vein ; the diameter of the orifice in the plate was 0-0406 met., that of the contracted section 0-0338 met., and the body of the adjutage, beyond this last, varied in length and expansion, the latter element being measured by the angle comprised between the sides pro¬ longed inwards. These adjutages were adapted to a reser¬ voir kept constantly full; the flow took place under a con¬ stant charge of 0-88 met., and he observed the time required to fill a vessel the capacity of which was 0-137 cub. met. The following table contains the results of his principal observations, the time corresponding to the theoretical velocity being 25s *49:— Adjutage. Expansion. Length Deg. min. 3 30 38 38 38 44 44 10 16 10 16 14 14 Met. o-lll 0-334 0-460 0-460 0-176 0-059 0-264 0 045 0-045 Time of Escape. Sec. 27- 5 210 21-0 190 25 0 31-0 28- 0 28-0 42-0 Co¬ efficient. 0-93 1-21 1-21 1-34 1-02 0-82 0-91 0-91 0-61 Venturi concludes, from his experiments, that the adju¬ tage of maximum waste should have a length of nine times the diameter of the smaller base, and an angle of diver¬ gence or expansion of 5° 6'. Such an adapted adjutage would give a waste 2‘4 times greater than an orifice in a thin plate, and T46 times greater than the theoretical waste. The dimensions also should vary with the charge. 120 HYDRODYNAMICS. Experi- 262. Venturi’s Lateral Communication of Motion in ments on Fluids (249) may be explained by one of his own ex- th® MQtion pennants. Let a pipe AC (fig. 54), about half an inch in of lluids. (jiameter an(j a f00t iong? proceeding from the reservoir AB, and having its extremity bent into the form CD, be inserted into the vessel CDG, whose side DG gradually rises till it passes over the rim of the vessel. Fill this vessel with water, and pour the same fluid into the reservoir AB, till, running down the pipe AC, it forms the stream EGH. In a short time the water in the vessel CDG will be carried off by the current EG, which communicates its motion to the adjacent fluid. In the same way, when a stream of water runs through air, it drags the air along with it, and produces wind. Hence we have the water-blowing ma¬ chine, which conveys a blast to furnaces (art. 540), and which will be described in a future part of this article. The lateral communication of motion, whether the surrounding fluid be air or water, is well illustrated by the following beautiful experiments of Venturi’s. In the side of the D Fig. 54. reservoir AB (fig. 54), insert the horizontal pipe P, about an inch and a half in diameter, and five inches long. At the point o of this pipe, about seven-tenths of an inch from the reservoir, fasten the bent glass tube onm, whose ca¬ vity communicates with that of the pipe, whilst its other extremity is immersed in coloured water contained in the small vessel F. When water is poured into the reservoir AB, having no connection with the pipe C, so that it may issue from the horizontal pipe, the red liquor will rise to¬ wards m in the incurvated tube onm. If the descending leg of this glass siphon be six inches and a half longer than the other, the red liquor will rise to the very top of the siphon, enter the pipe P, and running out with the other water, will in a short time leave the vessel F empty. Now, the cause of this phenomenon is evidently this: When the water begins to flow from the pipe P, it com¬ municates with the air in the siphon onm, and drags a portion along with it. The air in the siphon is therefore rarefied, and this process of rarefaction is constantly going on as long as the water runs through the horizontal pipe. The equilibrium between the external air pressing upon the fluid in the vessel F, and that included in the siphon, being thus destroyed, the red liquor will rise in the siphon, till it communicates with the issuing fluid, and is dragged along with it through the orifice of the pipe P, till the ves¬ sel F is emptied (421). 263. Another beautiful experiment of Venturi, and simi¬ lar to the above, was made in the following manner. He added three cylindrical tubes to the lower side of a conical diverging adjutage like that in fig. 53, and which would give OT37 cub. met. in 25s, the first pipe being at the contracted section, the second distant by one-third the length of the ad¬ jutage, and the third pipe at a distance of two-thirds the same length. These tubes were dipped into a vessel of mercury, Experl- and while the flow was taking place, the mercury rose in the ments on respective tubes to heights of 0T20, O046, and 0*0158 met.; the Motion if water had been in the vessel these heights would have ° U1 8* been 1*63, 0*63, and 0*125 mets. respectively. From the the- ory of Bernoulli!, the pressure in this experiment at the point of greatest contraction is expressed by — 1*60 met.; observa¬ tion gave it as — 1*63 met. 264. Eytelwein also made several experiments on di¬ verging adjutages; as these bear directly on the practical application of the subject, we shall briefly mention them. He took a series of cylindrical pipes of different lengths, and 0*026 met. in diameter, which w ere successively fitted on to a vase full of water; at first singly, then carrying at its anterior extremity a mouth-piece like A in fig. 53, which had nearly the form of the contracted vein ; afterwards, carrying at its other extremity an adjutage B (in fig. 53), of the form recommended by Venturi; and lastly, furnished at once both with mouth-piece and adjutage. The flow took place under a mean charge of 0*730 met., and the fol¬ lowing table gives the principal results :— Length of pipe. Metres. 0001 0-026 0-078 0-314 0-628 0-942 1-255 1-569 Coefficient of Waste of single pipe from Experi¬ ment. 0-62 0-62 0-82 0-77 0-73 0-68 0-63 0-60 Formula of pipes, 0-99 0-97 0-95 0-86 0-77 0-70 0-65 0-61 Waste of single pipe. With mouth¬ piece. 1-56 115 113 1-10 1-09 1-09 1-08 With ad¬ jutage. 1-35 1-27 1-24 1-23 1-21 1-17 The above table shows—1st, The ratio according to which the length of the pipes diminishes the waste; 2d, That the increase of the waste arising from the divergence which the mouth has at the entry of the pipes, diminishes in propor¬ tion as their lengths increase ; M, The effect of divergence diminishes the waste, and that more rapidly as the pipes increase in length. Eytelwein took a pipe 6*28 met. long, and 0*26 in diameter, and found no difference in the waste, whether he employed or not a diverging adjutage. When this adjutage was fitted on to the reservoir, the waste was 1*18, the theoretical being 1. On adapting it to the mouth¬ piece, but without the intermediate tube, it rose to T55; the mouth-piece alone gave only 0*92. Thus, the effect of the adjutage B (fig. 53), fitted on to the mouth-piece A of the same figure, augments the waste in the ratio of 0*92 to 1*55, or 1 : 1*69. 265. M. Venturi was induced to institute a set of experi¬ ments, in which he employed tubes of the various forms ex¬ hibited in fig. 55. The results of his researches are contained in the table of 258, for which we have computed the column containing the number of cubic inches discharged in 1 minute. The constant altitude of the water in the reservoir was 32 5 French inches, or 34*642 Eng¬ lish inches. The quantity of water which flowed out of the vessel in the times contained in the first column was4 French cubic feet, or 4*845 English cubic feet. The measures in the table are all English. « HYDRODYNAMICS. 121 Experi- 266. When a cylindrical tube is applied to an orifice, merits on the oblique motion of the particles which enter it is dimi- the Motion nisiiecl; the vertical velocity of the particles, therefore, is of Fluids. increasecj) ancl consequently the quantity of water discharged. M. Venturi maintains that the pressure of the atmosphere increases the discharge of water through a simple cylindrical tube, and that in conical tubes the pressure of the atmo¬ sphere increases the expenditure in the ratio of the exte¬ rior section of the tube to the section of the contracted vein, whatever be the position of the tube. SECTION III.—ON THE FLOW OF WATER OYER WEIRS, OYER- FALLS, OR DEVERSOIRS. 267. If we make a rectangular opening with a horizontal base in the upper part of the side of a vessel, the top edge being removed, the water, when maintained at a constant level, will flow out of this opening in the form of a sheet, and constitute an over-fall or weir. The flow of water over weirs is very important. To deter¬ mine the nature of the results arising from the use of such an orifice, we have to look principally to foreign hydrauli- cians. Dubuat in 1779 made several experiments on over- falls 18f inches wide, and 6f inches deep ; those of Ponce- let and Lesbros (388), 36 in number, were very carefully per¬ formed at Metz; the head, or charge of water, varied from £ of an inch up to 8 inches; and the width was constantly about 7f inches. Messrs Smeaton and Brindley conducted a set of experiments, made over a waste-board 6 inches wide, and from 1 to 6 inches deep. Dr Robison made se¬ veral experiments on the same subject. In 1834 MM. Daubisson and Castel made a series of very accurate ex¬ periments, at Toulouse water-works, on overfalls discharg¬ ing water from a rectangular canal 29f inches wide, and of a variable depth. The widths of the apertures ranged up¬ wards to the full width, and the bead varied from about 1 to 8 inches. Mr Ballard made a set on weirs, on the River Se¬ vern, at Powick, near Worcester, in September 1836. But the most recent experiments on weirs are a first series by Mr Thomas Evans Blackwell, performed on the Kennet and Avon Canal in July 1850, and a second series by Messrs Blackwell and Simpson, made at Chew Magna, Somerset, during the summer of the same year. 268. If we look attentively at a waste-board B (fig. 56), we shall find that the water at a short distance C above it assumes a curved form CD, so that its height immediately over the weir is not equal to AB but only to DB. Now, in the common theory the fluid particles are supposed to have the same velocity on their arrival at D, as if they had fallen freely down AD ; and so on, all the particles in the vertical section, DB, are assumed to flow out with velocities due to their heights below A: so that as respects the velo¬ city of exit, and the number of the fluid threads, and also as respects the discharge, the case of a weir on such a sup¬ position would be identical with a rectangular orifice closed at D, and in which the water level extended without any curvature up to A. Call, then, Q the volume discharged or waste escaped in one second, l the breadth of the weir, H and h the charge on the lower and upper edge respectively, m the coefficient of reduction of the theoretic to the real Experi¬ ments on the Motion of Fluids. waste, then have we (by Prop. IV., 184), Q — § ltj2g. m x(HVH-*V4> 269. However natural such a supposition might be, MM. Daubisson and Castel deduce from their experiments facts which show that the wastes are more exactly given by sup¬ posing that the escape took place as if from the whole height AB, the fluid being supposed without curvature up to A. On such a supposition, we have h = 0, and Q = y2g. ml H^IT= 5*35 . mlRfU. (Prop. III. 183). In the articles on Weirs, g is given in feet. Hence the escape over weirs is only a particular case of the flow by orifices in general, that, viz., where the charge on the upper edge is nothing. Both Bidone (404) and Poncelet (388) had already shown that this was the case, and that the coefficients which serve ordinary orifices can be adapted to weirs also, when the flow is made under analo¬ gous circumstances. 270. In the formulae given above, it has been supposed that the fluid above the sill was in repose, or rather above that point where the surface begins to be curved towards the sill. But this is not really the case, for before arriving at this point the water has received an initial velocity, which must be taken into account, as we have already done in Prop. XVI. 203. We must now add on to the head due to the velocity in the case where the water is in repose, and which is now only ^ H (Prop. V. 185), the head which would generate that velocity with which it arrives. Let this velocity be u, and h the charge due to it; then, since h = u2 — = 0 01552 x u2, we shall have the real velocity of issue ^9 = a/2g (|H + 0-01552 x^) = 5-35a/h + 0-03494 x u2; .•. Q = 5'35 x m/ . H . a/H + 0-03494 x u1. u denotes the mean velocity of the section of the water which approaches the weir; its exact determination is well nigh impossible; butas its value differs little from that of the velocity at the sur¬ face, the equality may be admitted, and will modify the value of the coefficient which is to be determined experimentally. Call, then, this new coefficient to', and tv the velocity of the surface of the water; then, Q = 5-35 x to' /HA/H +0-03494 x to2. 271. In the following experiments M. Castel1 has put these formulae to the test. We must remember, however, that the expression for the waste has two variables—the width of the weir, and a function of the velocity or charge. Now, in order that the formulae should have claim to be well-founded, it is necessary that the waste should be exactly proportional to each, in which case, the coefficient to' would be constant: if this should happen with the coefficient, it will be a test of the accuracy of the formulae. 272. M. Castel in 1835 and 1836 made numerous ex¬ periments on this subject, and with extraordinary care, at the Water-works of Toulouse. The principal apparatus which he employed was a wooden rectangular canal or trough, 6 met. long, 074 wide, and 0*55 deep: at one extremity he received a supply of water, and the other was so arranged that he could fit on thin copper plates in which the weirs were cut. The breadth of the overfalls varied from 0"01 to 0-74 met.; the sill or base was always 0-17 met. above the floor of the canal. The waste was received at pleasure and dur¬ ing a given time, into a zinc-plated cistern of 3-20 cub. met. capacity; this vessel was the gauge basin ; it was therefore graduated vertically with the greatest care. The time that VOL. XII. 1 Memoires de VAcademic des Sciences de Toulouse, tom. iv., 1837. Q 122 Experi¬ ments on the Motion of Fluids. HYDRODYNAMICS. the water took to rise a certain height was noted by a chronometer indicating quarter seconds. 273. The charges or heights of water above the sill of the weir were gradually increased from 003 to OTO and even to 0'24 met., for narrow overfalls. The most important, and, at the same time, the most difficult matter was to deter¬ mine exactly the measure of the charges. In order to do this very correctly, M. Castel placed over the middle of the canal, and parallel to its length, a bar or rule EF (fig. 56), and which carried, at distances of O’Oo met., JO vertical pointed brass rods a, b, c, d, e,f, g, h, i, k, graduated into millimetres, and capable of sliding up and down; on the edge of the guides was a vernier graduated into lOths of a millimetre. Whenever he wished to make an experiment, the requisite amount of water was admitted into the canal, and the regime or regulation for the proper supply being duly at- Experi- tended to, he let down the system of 1.0 rods, and put their ments on points as accurately as possible in contact with the curved the Mo^on surface of the water. On subtracting, then, the reading Flinds. of each rod from the vertical distance between the horizon- tal bar EF and the sill B, he obtained the values of the or¬ dinates of the curve which the fluid particles described, as they advanced to the centre of the overfall B. These ordi¬ nates increased as they became more distant from B : at 0'2 or 0'3 or 0'4 met., the increase was sensible; the greatest ordinate was the true charge H, while the smallest was the charge immediately over the sill or H — A= the thickness of the sheet of water over the base B. The mean results of these experiments are to be seen in the following table:— Canal, 0'74 metres wide. Charge upon the Sill, in metres. 0-24 0-22 0-20 0-18 0-16 014 0-12 0-10 0-08 0-06 0-05 004 0-03 Coefficients, the Length of the Overfall being, in metres, 0-662 0-662 0-662 0-662 0-663 0-657 0-656 0-656 0-656 0-656 0-660 0-G0 0-644 0-644 0-645 0-644 0-645 0-651 0-631 0-632 0-632 0-633 0-636 0-642 0-621 0-621 0-620 0-622 0-626 0-632 0-636 0-603 0-604 0-604 0-606 0-610 0-616 0-623 0-631 0-596 0-595 0-595 0-593 0-592 0-593 0-595 0-604 0-611 0-619 0 624 0-10 0-595 0-594 0-594 0-594 0-592 0-592 0-591 0-591 0-592 0-595 0-597 0-604 0-618 0-05 0-615 0-614 0-614 0-613 0-613 0-612 0-612 0-612 0-612 0-612 0-613 0-614 0-629 0-628 0-628 0-628 0-628 0-627 0-627 0-628 0-629 0-02 0-639 0-639 0-640 0-641 0-642 0-643 0-645 0-648 0-652 0-658 0-663 0-669 0-670 0-672 0-674 0-675 0-678 0-687 0-698 0-713 274. After having in great measure exhausted the obser¬ vations on the above canal, M. Castel experimented on one 0361 met. wide, narrowing up the former by two partition boards 2‘24 met. long. At the entrance of this small canal, which was placed in the centre of the larger, there was formed under large discharges a minute fall, which would have in¬ troduced some slight modifications into the results obtained had the partitions been extended up to the extremity of the larger canal. M. Caste!, both on this and the former canal, performed in all 494 experiments, each being re¬ peated twice. In each case the values of Q, l, and H, being given immediately by experiment, the coefficient m was deduced from the formula Q = 5‘35 w/H (269). The mean values of the experiments on the second canal are set down in the following table. In this and the former table where blanks occur no observations were made:— Charge upon the Sill, in metres. Canal, 0-361 metres wide. Coefficients, the Length of the Overfall being, in metres, 0-10 0-079 0-05 0-03 0-02 0-01 0-24 0-22 0-20 0-18 0-16 0-14 0-12 0-10 0-08 0-06 0-05 0-04 0-03 0-700 0-684 0-672 0-669 0-667 0-668 0-670 0-678 0-666 0-656 0-652 0-652 0-653 0-653 0-665 0-633 0-628 0-624 0-620 0-617 0-616 0-617 0 620 0-624 0-632 0-619 0-615 0-611 0-608 0-605 0-603 0-600 0-598 0-599 0-600 0-605 0-613 0-628 0-613 0-608 0-606 0-603 0-601 0-599 0-598 0-597 0-597 0-604 0-611 0-625 0-617 0-614 0-610 0-608 0-605 0-603 0-600 0-599 0-600 0-624 0-620 0-618 0-616 0-615 0-614 0-614 0-614 0-613 0-613 0-614 0-613 0-629 0-627 0-626 0-626 0-625 0-624 0-623 0-624 0-624 6-626 0-647 0-646 0-645 0-644 0-644 0-644 0-646 0-648 0-654 666 667 668 674 275. After having tabulated these results, M. Castel ap¬ plies thejfimple and common formula Q = 5'35x/H 3C H^FI, and first shows that the wastes Q are propor¬ tional to the function of the charge H */H7 For this pur¬ pose he takes the twenty-two series of wastes obtained, each with the same width of weir, but under different charges; he reduces the discharges of each series to that which they would have been, if one of them, e.g., that under (FOB met., had been taken for unity or 1 ; he reduces also the series of HYDRODYNAMICS. 123 Experi- vaiues 0f H^H, and places them side by side, as in columns ,me»ft\°n 1, 2, 3 of the following table :— the Motion ’ ’ ° canal 0-36 wide, with an overfall 0-05 met. long. The con¬ clusions, then, derived from a comparison of the twenty-two series of wastes with each other, and with those derived from the function H H are— 1^, That, on exceeding the charge 0-06 or even 0-05 met., some higher charges being excepted, the difference between the numbers of the same horizontal line are very small; they rise only by a 100th or so ; and thus, in a practical point of view, the difference may be taken as nothing; so that the relation between the wastes may be regarded as_the same as that between the corresponding values of H 2d, That for charges of O’Oo metand below it, the wastes decrease in a ratio less than II /^H, and much less as the charge becomes more feeble, but only with the mean lengths; for when they are very small, or when they approach the width of the canal, the equality is again produced. 3t/, In some higher charges, especially with wide over- falls, the wastes increase in a less ratio than H VH. I his result, which was scarcely perceptible in a canal of 0-74 met., became very prominent in one of 036 met., where the water with these charges and with these widths, arrived at the over- fall with considerable velocity. Now, in these cases, and they always present themselves when the fluid section £. H at the passage of the weir exceeds the fifth part of the section of the current in the canal, the wastes ought not to increase as H but as H VH + 003194 x so that the for¬ mula as given in 270 must now be used. Hence, in limit¬ ing the subject to overfalls, properly so called, that is, those in which the water has an initial velocity of arrival, Q will be very nearly proportional to H VH. 276. The formula, however, is no longer so coincident with experiment when the widths of the overfall vary. Beginning with the width of the basin the wastes diminish with the width of the overfall, but more rapidly up to a certain point, beyond which they dimi¬ nish, less rapidly. The follow¬ ing table will show this. The canalofO^dmet. has 12 widths, which areas the numbers in the first column; the second column shows the progress in which the corresponding wastes diminish, which were obtained under charges varying from 0-06 to 0T0 met. In the case of the canal of 0-36 met., where ten Canal of 0'74 Metres. 0‘36 Metres. Width. Waste 1000 919 811 676 540 405 270 135 68 40 27 13 1000 911 788 645 507 371 243 121 62 40 27 14 Width. Waste 1000 831 554 277 138 1000 807 507 246 125 of Fluids. widths were employed, those only are set down which were Experi- nearly analogous to those of the other canal. 1 his series of ®ie”ts °n relations indicates that in both canals the wastes follow one e 0 10n and the same law with respect to the widths of the over- falls ; to the relative widths, however, of the respective canals, and not to the absolute widths. 277. Since for one and the same width of overfall, and on neglecting extreme cases, the wastes are proportional to H a/H, the coefficients should be nearly equal, and tables of 273 and 274 show us that they are so. Strictly speaking, however, the coefficients of any vertical column, beginning with the higher charges, decrease, generally very slowly, down to a certain charge, beyond which they rapidy in¬ crease ; this charge, which is about 0T0 met., will be a mini¬ mum. Further, the charges remaining the same, the wastes at first decrease more and afterwards less rapidly than the widths of the overfalls; it follows that under the same charge, beginning with the width of the channel, the coefficients go on diminishing up to a certain point, and then beyond this increase. At this point, then, there will also be a minimum, which takes place when the width of the over- fall is nearly one-fourth that of the channel of supply. Thus, in the horizontal as well as in the vertical columns of 273 and 274, there is a minimum, and hence there is a common minimum. In its immediate neighbourhood the coefficients on each side of it are very little different from one another ; the variation is small, and so may be regarded as constant. But beyond this distance, the differences be¬ come considerable ; they exceed an 8th in the values; and hence the waste by overfalls cannot be properly given with a constant numerical coefficient in the expression ZH/s/H, for, mathematically speaking, the expression would not be admissible. In practice, then, we would require the assist¬ ance of a very extended table of coefficients deduced from hundreds of experiments. But the nature of the motion which the coefficients follow, when properly looked at, will enable us to avoid this labour, and to deduce a few simple rules suitable to the different cases which present them¬ selves. 278. From what has been said in 275, the formula ZH^/H is not applicable, on the one hand, when the charges are under O06 met.; nor, on the other, when the product of the transverse area and the width of the overfall exceeds the fifth part of the section of water in the supply¬ ing canal. Between these limiting values the above ex¬ pression may be very well employed when combined with a coefficient depending on the width of the overfall. Reckoning from the width of the canal itself, the coeffi¬ cients diminish with the width of the overfall, until it has reached the fourth part of that of the channel; they still in¬ crease although the widths continually diminish; and what is rather remarkable, the coefficients, when diminishing, follow the relative widths of the overfall with respect to that of the canal, whereas, when they are increasing, which occurs afterwards, they depend on the absolute widths. Such being the case, there will be four cases to distin¬ guish relative to the coefficient to be employed in actual practice. 1^, In the neighbourhood of the common minimum already mentioned, the coefficients vary very little from each other. From the experiments of M. Castel at Toulouse, from a width of overfall nearly equal to one-third of that of the canal, supposed to exceed O30 met., down to an abso¬ lute width of 0’05 met., the coefficients only varied from 0‘59 to 061, the mean of which is 0*60. Therefore the variable coefficient in this case to multiply/FWH will be 5’35 x 0,60 = 3-21. Hence, between the limits, we have Q=3,21 x i hx/h; a formula which is well adapted for gauging small streams of water. 124 Experi¬ ments on the Motion of Fluids. HYDRODYNAMICS. Zd, When the width of the overfall is a maximum, that is, equal to the whole breadth of the canal, in which case it will be a weir or waste-board proper, the coefficients have a remarkable constancy. M. Castel, in his experiments with a barrier O'17 met. high, found no difference betw-een the co- efficientsobtainedfromehargesvaryingfrom 0'03 to0*08met. With an overfall 0*225 met. high the coefficients varied only from 0*664 to 0*666, the charges varying from 0*031 to 0*074 met; when he took the mean it was 0*665. Hence, since 5*35 x 0*665 = 3*55775, and calling L the width of the canal or length of the barrier, we have Q = 3*558 x LH^/ H, a for¬ mula which may be used advantageously in gauging large courses of water, and with charges varying from 0*04 to 0*03 met. ; but for accuracy it is necessary that the charge be less than one-third the height of the barrier. 3d, For widths of overfalls comprised between that of the channel and the fourth part of the same, the coefficient of the expression 5*35 x will vary with the relative width, or the ratio of the width of the overfall to that of the canal. The annexed table of coefficients is the result. These coefficients have been found, not by direct experi¬ ment, but by taking propor¬ tional parts between the co¬ efficients deduced from expe¬ riment, and those from the tables given in 273 and that of 274. The coefficients for both canals were separately determined by observation, in order to show that the same relative width has correspond¬ ing coefficients sensibly the same, although the real value of the width was in one canal nearly double that of the other, which was a clear proof, that above 0*25 met., or a fourth part of the width of the channel, the coefficients de¬ pend for their value on the relative, not on the absolute widths of the overfall. A.th, It is otherwise, however, when this width falls below a fourth that of the canal. Then, and when at the same time it is less than 0*08, or 0*06 met., the width of the canal has no further effect, and each absolute width of the overfall has its proper coefficient. Thus, on the canal of 0*36 met., as on that of 0*74, the widths of 0*05, 0*03, 0*02, 0*01 met., gave in both coefficients of 0*61, 0*63, 0*65, and 0*67 respec¬ tively. 279. With respect to the formulagiven in 268, or Q = 5*35 x -WA), where A = AD (fig. 56), the last column of the table in art. 275 lets us^see that although the series of values tabulated for (Hv^H —hsjK) differs little from those of the corresponding wastes, yet it follows them less closely than does the series of values for H\/H. Hence, on this account, the second formula is less trustworthy than the first. Its application, besides, is made more difficult, for it has a term A\/h, the exact determination of which is very difficult. 280. In the formula, however, involving a term which is a function of the velocity with which the water flowing in the canal arrives at the overfall, this is scarcely the case. 1 his formula is for the case of a high velocity, where the water makes its escape in virtue both of the charge H, and thiit due to a previously acquired velocity; it is expressed by Q = 5'35 xml H\/ H + 0*03194 x w2, which leads to 270. M. Castel has deduced from his experiments values for the coefficient m. In these experiments he did not mea¬ sure the velocity w of the surface current in the canal, but it may be determined from the mean velocity, which in this case is Q~v L (II +o), where L is in this case the width Relative width. Coefficient for Canal of 0-74 Met. 0-36 Met 1-00 0-90 0-80 0*70 0*60 0*50 0*40 0*30 0*25 0*662 0*656 0*644 0*635 0-626 0*617 0-607 0-598 0-595 0-667 0-659 0-648 0-635 0-623 0-613 0-609 0-600 0-598 of the channel of supply, a the height of the sill above the Experi- bottom of the channel, and H the charge. merits on The velocity of surface water will be shown in 331the AI°tion to be a 4th part higher than the mean velocity ; hence we v°^l luids* have, ?c=T25 x T- .5^ .. With this value of w, which L(H + a) is the highest that can be assumed, the coefficient m! differs only from m of the common formula when the velocity in the canal has a value sufficiently great that 0*03494 x ?/r, which causes the difference between the two formulae, is comparable with H. Since 0*03494 x wl is very small, and under the square root, it will influence the quantity m by little more than half its amount relative to H ; if it be, for example, 2, 4, or 6 hundredths of H, the coefficients, every¬ thing else being the same, will only differ from each other by 1, 2, or 3 hundredths. In these three cases the section l H of the fluid sheet at the overfall is found to be respectively 0*1724, 0*244, and 0*3 times the section of the supplying canal, or L (H + a) ; wherefore, when the first of these two sections is less than the 5th part of the second, m and ni will be within °f each other. This was the case with two overfalls experimented on by M. Castel, where the width was less by one-half than that of the channel of supply. When it was greater, the term 0*03494 x w3 had more in¬ fluence, and the difference between the coefficients became greater. But although this term has been employed, it has not reduced to equality the coefficients m and m for different widths of overfall; it has not reduced by one-half the differences which the values of m present, so that neither of the expressions Q = 5*35 x m^H\/H, Q = 5*35 x m' l H\/H + 0*03494 x w1 can be employed with a con¬ stant coefficient, except where the width of the overfall is the same as that of the canal of supply. In order then to determine this constant coefficient, M. Castel dammed up a canal of 0*74 met. by copper barriers, the heightof which gradually decreased from 0*225 to0*032 met.; and he found coefficients as noted in the following table :— Height of barrier. Met. 0-225 0-170 0-130 0-093 0-075 0-041 0032 Coefficients m', the charge being Met. 0-08 0-651 0-640 0 650 0-635 0-647 0-667 0-676 Met. 0-06 0-655 0-647 0-649 0-642 0-652 0-664 0-676 Met. 0-05 0-657 0-650 0-652 0-646 0 655 0-665 0-676 Met. 0-04 0-660 0-654 0-656 0-650 0-660 0-668 0-680 Those of the first five barriers are nearly the same, although otherwise they do not present the same regularity as ordi¬ nary overfalls : the mean term may be taken as 0*650. With respect to the last two barriers of 0*041 and 0*032 met., they are in a distinct class ; they were very low, and the charges much exceeded their height; so that the case was as much one of a course of water flowing in an ordinary chan¬ nel as when it passed over a waste-board. Since there was a near equality between the coefficients for one and the same barrier, the formula which was employed for their determi¬ nation is in a manner confirmed. The experiments again on the canal of 0*36 with a barrier of 0*17 met. high, gave coefficients the mean of which was 0*654. Let the mean between those two means be taken, or 0*652, then since 5*35 x 0*652 = 3*488, .*. Q = 3*488 x LHvTl + 0*0349 x w\ where w is to be determined by direct observation. HYDRODYNAMICS. 125 Experi- We have been very particular with these experiments of ments on M. Caste!, and Daubisson’s remarks upon them, owing to the Motion t]ie importance of the subject ; for further information, of Fluids see v0|ume already mentioned. Sometimes channels are adapted to overfalls, in which case the water discharged will be confined, and be resisted by the friction of the bot¬ tom and sides ; this retardation must react on the water and diminish the discharge. Into this case, however, we need not enter. 281. There is still a particular case of an overfall to be considered ; it is that which Dubuat has termed a demi- deversoir or deversoir incomplet; we call such overfalls drotvned weirs. A drowned weir, then, is when the tail of the water rises above the level of the waste board sill. Du¬ buat divided the height AC (fig. 57), the level of the canal Fig. 57. above that of the sill C, into two parts, Kb and bC; the flow from the first he considered as from an ordinary over- fall where Kb ( = H) would be the charge, and the volume of escape by it would be Q = 3‘488 x / H V H + O’OSdQ x w2. In the second part he regarded the flow as taking place out of a rectangular orifice, the height of which was bC, and the charge equal to the difference of level Kb, between the sur¬ face of the upper and that of the lower course. The height of this lower surface above the sill is bC; and this height 5C will be equal to n —y, representing n and y respectively by Z>D and CD. To the charge Kb or H must be added, as in the case of closed orifices, the height due to the velocity u of the water in the canal, and then the velocity of issue will be s/'Zg (H +001553 x if), or = \/2 <7 (H +0,01 x id1), where w = \‘2o x u (280). Hence for the volume discharged by this part we have Q = TOG xl (n —y) y/li + 0 01 x w2. Let the two partial discharges be added together so as to obtain the total waste Q' ; .*. Q' = 3-488 x l H\/H + 0-0349 xw2 j + 4*96 x l (n—y) H + 0-01 x w2. 282. Mr Smeaton made several experiments on weirs. He conducted his observations by noting the time in which a vessel of 20 cubic feet would be filled with water flowing over a notch 6 inches wide, of various depths, and with different charges, as given in the table. The annexed table will show his results. We have thus a method of determining the coefficients. Thus, let the head, as in table 287, be 0-1042 feet, then from formula Q = %inV¥gYi = % x 0-05 x 0-1042 x 8-024 x V0-1042 = 0-08995 cubic feet per second: but the experiment gave 20 cubic feet in 326 seconds; hence, we have in one second 0"06135 cubic feet; Depth of notch in inches. Time of dis¬ charging 20 cubic feet. 1 ^ 3 Gy 5 H H 54 Sec. 436 295 139 93 30 46 326 230 47 .-. 0 08995 : 0-06135=1 : 0"682 = coefficient. 283. In September 1836, Mr S. Ballard made a series of experiments on the flow of water over weirs on the Severn at Powick, near Worcester. The experiments were made on a weir 2 feet long, which stood perpendicularly across a trough, and the results are exhibited in the following Expen- o ’ ments or table:— Depth of wa tor flowing over weir, in inches. Cubic feet per minute, over 1 foot of weir. 1 H 14 2 2i 24 2f 3 3J 34 3f 5-88 7-14 9-55 12-37 14-93 18-29 23-07 27-69 3214 34-61 37-81 41-47 Depth of wa¬ ter flowing over weir, in inches. 4 4i 44 4| 5 5i 54 5f 6 7 8 Cubic feet per minute, over 1 foot of weir. 46-87 49-45 54-87 59-60 63-38 66-17 73-17 77-58 82-56 102-27 126-76 At the commencement of these experiments the results could not be rendered satisfactory owing to the difficulty of observing the exact depth of water on the weir, the gauge on the side being rendered inaccurate by the action of capillarity. The method then adopted was to attach two needles, one a very little larger than the other, to the lower end of a nicely graduated gauge, so that on the water being admitted by a sluice, regulated by a screw, its level was adjusted until it just touched the longer needle, and occa¬ sionally by its uneven motions the shorter one, which thus gave the exact height of the water above the weir. I he gauge tank was graduated vertically and capable of contain¬ ing 300 cubic feet. It was thought that the perpendicular position of the board forming the weir might lessen the volume passing over it, and, to avoid this, a sloping board was substituted, inclining on the upper side from the top of the weir downwards. Under this new arrangement the volume discharged w'as increased, with 1 inch depth of water, from 5-88 cubic feet per minute to 6‘76 cubic feet in the same time, or about 15 per cent. Experiments were afterwards made on a weir 1 foot long, and the volume discharged was found to be less than with the 2-feet weirs. This was attributed to the contracted stream caused by the direction of the course of water at the sides of the weir. Experiments were also tried with oblique and circular weirs, and the volume of discharge was found uniformly to increase with the length of the weir. See Civil Engineer and Architects' Journal, vol. xiv., p. 647. 284. The experiments on overfalls by Mr T. E. Black- well, being conducted on a much larger scale, may, for prac¬ tical purposes, be regarded as furnishing results even more trustworthy and valuable than those of Dubuat, MM. Dau- bisson, and Castel. The first set of experiments was made in July 1850, in a side pond of the Kennet and Avon Canal, the area of which measured 106,200 square feet. It was guarded by a lock at each end, so that no current disturbed the surface. The supply reservoir, which was distinct from the experimental one, did not furnish a supply equal to the volume that escaped. The deficiency was made up three or four times a-day from the upper lock. This, how¬ ever, would make no appreciable difference in the result when the reservoir was so large and the time required so small. The subsidence of the water due to even the largest volume of 444 cubic feet discharged, would only be about 0'00418 feet over the whole surface, so that the mean fall would be no more than 0,00209 feet. At some small distance above the overfall, the depth of water was some- wdiat reduced by a submerged course of masonry which rose to within 18 or 20 inches of the surface ; and the over- fall was placed on the outer line of the dam, and not exactly in the line of one of the sides of the reservoir. From the measurements given of the head, taken at still water, and the corresponding depth of the sheet of water flow- 126 HYDRODYNAMICS. Expert- jng off, it appeared that some degree of resistance opposed the^Motion t^ie rnot*on the water up to the overfall. Every care was of Fluids” taken to determine the correct head of water, or the total i ^ > depth from the surface of the water to the crest of the bar or overfall. The bar itself was about 12 feet long and 2 feet deep, and was arranged to rise or fall at pleasure, and the crest of the bar was made as level as possible. The gauging tank had a capacity of 444‘39 cubic feet; whatever leakage took place during an experiment was carefully mea¬ sured in a separate vessel. The plate forming the overfall bar was of iron, i^th inch thick. 285. The second set of experiments, in which he was as¬ sisted by Mr Simpson, were performed during the summer of 1850, at Chew Magna, Somersetshire ; the reservoir em¬ ployed was a very small one, and kept constantly supplied by a pipe 2 feet in diameter, discharging from an upper tank under a head of 19 feet. As the distance between the ex¬ perimental and supply reservoir was only 100 feet, it was presumed that the water arrived at the overfall with some part of the velocity due to so great a head ; this was per¬ ceptible to the eye in heads above 5 or 6 inches, but the peculiar form of the reservoir prevented the amount from being accurately determined,—a circumstance which so far casts uncertainty on the results. The overfall reservoir had wings placed at an angle of 45°, and the overfall bar was a cast-iron plate r\th inch thick, with a square top. The heads were measured on a bar 4 feet long, and placed dia¬ gonally that its zero point was just level with the overfall top, and its upper end raised one foot above ; it was divided and subdivided so that T\th of an inch could be easily read. The gauging tank had a capacity of 400 cubic feet, but for the purposes of experiment it only contained SSO’TO cubic feet. Experiments on Overfalls, Rennet and Avon Canal. Overfall. O 0) o 73 © o |^.5 'S »-.5 j © > S a> . >■ 1. Thin plate 3 ft. f long. \ Thin plate 10 long. Plank 2 in. wide, ! 3 ft. long. j Plank 2 in.thick, 6 ft. long. Plank 2 in.thick, 10 ft. long. Plank 2 in. wide, f 10 ft. long. \ Crest 3 ft. wide, 3 ft. long, slope 1 in 12. Crest 3 ft. wide, 3 ft. long, slope 1 in 18. Crest 10 ft. long, ( 3 ft. wide, •069 J •060 •072 •076 •079 •059 •077 •074 •069 I •071 J •056 •077 •074 •072 I •069 j ■086 •097 . •300 •064 •060 "1 •066 J ■063 1 060 ) Mean of Coeffi¬ cients. 086 286. The tabulated results give observations on the Experi- flow of water—over a plank 2 inches thick, with square ments on edges; over a thin plate ; over a crest, resembling the top t^.eJ^0.t!on of a weir, of which the breadth was 3 feet, the position of ° the surfaces horizontal; and also at inclinations downwards, " of 1 in 18, and 1 in 12 respectively. These main divisions were observed throughout, and the lengths of the weirs were severally 3 feet, 6 feet, and 10 feet. The formula which has been compared with experiments, so as to de¬ termine the coefficient m, is Q = m l H and the for¬ mula in use among English engineers for the discharge, or D = A. /. H \/H = 5T xHf, where D is the volume of waste per minute for every foot in width of the overfall, H the head in inches, and 5*1 a constant coefficient of reduc¬ tion. Mr Blackwell has set down in the tables the value of the variable coefficient h. The preceding table is taken from twelve different tables, containing the result of 243 experiments on overfalls where the reservoir was large in proportion to the overfall, and the water was still. The mean coefficient of each table is set down. The following table is the result of seventy experiments on an overfall 10 feet long and 2 inches wide, with a reser¬ voir of5717 square feet, kept constantly full:— Experiments on Overfalls. (Overfall bar, 10 feet long, 2 inches wide.) Per second. •690 2-900 4-115 4-700 7- 620 8- 900 8-870 11-290 14-150 14-500 19-450 23-380 27-550 Average per second. •690 2-900 4-115 4-700 7- 680 8- 770 9- 017 11-290 14-150 14-030 19-610 23-380 27-550 Per second for 1 foot in width. •069 •290 •412 •470 •768 •877 •902 1-129 1-415 1-443 1- 961 2- 338 2-755 Coefficients. •394 •455 •437 •469 •497 •507 •500 •520 •499 •499 •478 -535 •521 Mean... -480 The results in the table of the first set of experiments represent the case of the discharge of water by an overfall from a large still reservoir. In the second set the dis¬ charges are analogous to the case of a weir in a river or in a running stream. 287. Mr Blackwell deduces from his experiments seve¬ ral important facts. In thin plates the coefficient is highest at the smallest head observed ; it reaches the mean at a head of about 3 inches, but beyond this point it decreases as the head increases. With a plank 2 inches thick, and a head of I inch, the coefficient is less than the mean ; the mean is earlier reached as the length of the weir becomes greater ; the mean head is about 3 inches, the coefficient continues to rise higher than the mean till the head reaches about 9 inches, but after this it is depressed below it. He found that a head of about 4 inches gave a smaller outflow than could be obtained by interpolating the results with heads of 3 and 5 inches. It is difficult to explain the rea¬ son of the depression. Mr Blackwell also made several experiments to deter¬ mine the effect of converging wing walls, noting the results on a weir 10 feet long, with and without wings, the wings HYDRODYNAMICS. 127 Experi- making an angle of 54°. The mean coefficient for that merits on without wings was -371, while that with wings was -409. the Motion coefficients in the second table, up to a head of 3 inches, of Fluids. are ke]ow tjie mean, above that head they fluctuate con- ^ siderably; but generally they keep above the main line. These anomalies are difficult to be accounted for, since every care was taken in the experiments. They remain to ^jotjon be elucidated by further investigations. of Fluids. The following table, compiled from various sources, gives at one view the results of different experimenters : Experiments on Overfalls. Overfall O'5 feet long. Smeaton and Brindley. Heads Coefficients. •083 •713 ■1042 •681 •1146 •654 •1354 •638 •1927 •636 •2604 •602 •4166 •609 •4687 •571 •5417 •633 Overfall 1'533 feet long. Dubuat. Heads Coefficients. •1482 •648 •2666 •624 ■3887 •627 •5627 •630 Overfall 0'656/ee« long. Daubisson and Castel. Heads Coefficients. •098 •632 •131 •624 •164 •620 •196 •617 •262 •616 •328 •617 •393 •620 •459 •624 •524 •628 •590 •633 Overfall 0-6548 feet long. Poncelet and Lesbros. Heads Coefficients. •033 •626 •066 ■625 •099 •618 •1332 ■611 •1998 •601 •2664 •595 •333 •592 •50 •590 •666 •585 •75 •577 Overfall 3 feet long and 10 feet long. Blackwell. Heads Coefficients. •083 •742 •166 •738 •25 ■636 •33 •635 •416 •625 •50 •592 •583 •666 •580 •75 •529 Overfall 10 feet long. Simpson and Blackwell. Heads Coefficients.. •083 •166 608 -682 ■25 •725 •33 •745 ■416 •50 780 -749 ■583 •772 •666 •802 •75 •781 288. According to Mr Beardmore, in his Hydraulic and Tide Tables, the best mode of gauging weirs is by means of a post with a smooth head, level with the edge of the waste-board or sill, and driven firmly in some part ot the pond above the weir, which has still water. A common rule can then be used for ascertaining the depth, or a gauge, showing at sight the depth of water passing over, may be nailed on, with its zero at the level of the sill of the weir. Among practical engineers, gauging by a weir has been always justly held to afford the most certain and efficient re¬ sult, especially for ascertaining the comparative discharges of streams. For correct gauging, the effects of wind and cur¬ rent must be destroyed, a thin-edged waste-board must be used, and a weir not so long in proportion to the width above it as to wire-draw the stream, else the water will arrive at the weir with an initial velocity due to a fall which is not estimated in the gauging, and the result will be most probably too small. A weir, for correct gauging, should always have a free fall over; but there are sometimes cases where mea¬ surements are required with drowned weirs—so called when the tail has risen above the level of the sill. In this case we have two conditions which have been already stated in 281. Mr Beardmore’s Hydraulic Tables for overfalls pro¬ per, gives the discharge for one foot of length. SECTION IV.—EXPERIMENTS ON THE EXHAUSTION OF VESSELS. 289 It is almost impossible to determine the exact time in which any vessel of water is completely emptied. When the surface of the fluid has descended within a few inches of the orifice, a kind of conoidal funnel, of which the air occupies the middle part, is formed immediately above the orifice. The pressure of the superincumbent column being therefore removed, the time of exhaustion is prolonged. The water falls in drops ; and it is next to impossible to de¬ termine the moment when the vessel is empty. Instead, therefore, of endeavouring to ascertain the time in which vessels are completely exhausted, the Abbe Bossut has de¬ termined the times in which the upper surface of the fluid descends through a certain height:— 128 HYDRODYNAMICS. Experi¬ ments on the Motion of Fluids. Times in which Vessels are parti// exhausted. Original altitude of the water in the vessel. H Paris feet. 11-6666 Constant area of a horizonal section of the vessel. Diameter of the circular orifice. Depression of the upper surface of the fluid. H — 7t = a Feet. 4 4 9 9 Time in which this depression takes place. Min. sec. 7 25J 1 52 20 24£ 5 6 Comparison of the Results of Theory with those of Experiment. Diameter of the circular orifice. Inches. 1 2 1 2 Depression of the up¬ per surface of the fluid. Feet. 4 4 9 9 Time of the depression of the surface by experiment. Min. sec. 7 25£ 1 52 20 24J 5 6 Time of the depression of the surface by the for¬ mula. Min. sec. 7 22-36 1 50-59 20 16 5 4 Difference between the theory and the experi¬ ments. Seconds. 3-14 1- 41 8-50 2- 00 It appears from this table also that the times of discharge, by experiment, differ very little from those deduced from the corrected formula; and that the latter always err in defect. When the orifices are in the sides of the reservoir, the alti¬ tudes H, h of the surface may be reckoned from the centre of gravity of the orifice, unless when it is very large. 290. In order to compare these experimental results with those deduced from theory, we must employ the formula of Prop. X. 196, where the expression for the surface de¬ scending through any space a in a given time is T = 2^=(VH-n/A). mSv 2g Let there be, for example, a prismatic vessel, the hori¬ zontal section of which is a square of O’97o met. to the side, the orifice in the bottom being 0-027l met. in diameter ; the depth of water in itoverthe centre of the orifice is 3*79 met.; in what time will the surface fall through a depth of 1‘30 met., reckoning from the orifice ? Here A = (0*975 met.)2 = 0*9506 sq. met., S = 7r (0*0135)2 = 0*000577 sq. met, H = 3*79, A = 3*79 - 1*30 = 2*49 met, and m say 0*61 ; .*. T= 2x0 9506 (V SYtT-V 2A9)=450s=7m 30s. 0-61xO-000577xV 2s and Dialers compared with the Quantities the Motion discharged from additional 1 ubes inserted in the same Reservoir. of Fluids. Constant al¬ titude of the water in the reservoir above the axis of the tube. Lengtli of the conduit pipes. Feet. 30 90 180 30 90 180 Quantity of water discharged in a minute by an additional tube. Quantity of water dis¬ charged by the conduit pipe in a minute. Tube and pipe 16 lines diam. Cubic inches. 6330 6330 6330 8939 8939 8939 Cubic inches. 2778 1587 1052 4066 2352 1583 Ratio between the quantities of water furnished by the tube and the pipe of 16 lines diameter. Quantity of water dis¬ charged by an additional tube in a minute. Quantity of water dis¬ charged by the conduit pipe in a minute. 1 to -4389 1 to -2507 to 1 to 1 to to •1662 •4548 ■2631 1770 Tube and pipe 24 lines diam. Cubic inches. Cubic inches. Ratio between the quantities of water furnished by the tube and the pipe of 24 lines diameter. 7680 4534 3119 11219 6812 4710 to -5392 to ‘3183 to -2190 to -5578 to -3387 to -2341 Experi¬ ments on the Motion of Fluids. 307. 1 lie third column of the preceding table contains the quantity of water discharged through an additional cylindrical tube 16 lines in diameter, or the quantity dis¬ charged from the reservoir into a conduit pipe of the same diameter; and the fourth column contains the quantity discharged by the conduit pipe. The fifth column, there¬ fore, which contains the ratio between these quantities, will also contain the ratio between the velocity of the water at its entrance into the conduit pipe, which we shall afterwards call its initial velocity, and its velocity when it issues from the pipe, which shall be denominated its final velocity ; for the velocities are as the quantities discharged, when the orifices are the same. The same may be said of the 6th, 7th, and 8th columns, with this difference only, that they apply to a cylindrical tube and a conduit pipe 24 lines in diameter. 308. By examining some of the experiments in the fore¬ going table, it will appear that the water sometimes loses X^ths of its initial velocity. The velocity thus lost is con¬ sumed by the friction of the water on the sides of the pipe, as the quantities discharged, and consequently the veloci¬ ties, diminish when the length of the pipe is increased. In simple orifices, the friction is in the inverse ratio of their diameter; and it appears from the table, that the velocity of the water is more retarded in the pipe 16 lines in dia¬ meter, than in the other which has a diameter of 24 lines. But though the velocity decreases when the length of the tube is increased, it by no means decreases in a regular arithmetical progression, as some authors have maintained. 1 his is obvious from the table, from which it appears, that the difi’erences between the quantities discharged, which represent also the differences between the velocities, always decrease, whereas the differences would have been equal, bid the velocities decreased in an arithmetical progression. ie same truth is capable of a physical explanation. If every filament of the fluid rubbed against the sides of the conduit pipe, then, since in equal times they all experience t le same degree of friction, the velocities must diminish in tie direct ratio of the lengths of the tubes, and will form a regular arithmetical progression, of which the first term will be the final, and the last the initial velocity of the water, ut it is only the lateral filaments that are exposed to fric- , lls retar^s their motion ; and the adjacent filaments which do not touch the pipe, by the adhesion to those winch do touch it, experience also a retardation, but in a less degree, and go on with the rest, each filament sustain¬ ing a diminution of velocity inversely proportional to its dis¬ tance from the sides of the pipe. The lateral filaments alone, therefore, provided they always remain in contact wdth the sides of the pipe, will have their velocities dimi¬ nished in arithmetical progression, while the velocities of the central filaments will not decrease in a much slower progression ; consequently, the mean velocity of the fluid, oi that to which the quantities discharged are proportional, will decrease less rapidly than the terms of an arithmetical progression. 309. Bossut made the following experiment to show, that, in open channels and pipes, even where there is a consider¬ able slope, the flow very soon becomes uniform. He con¬ structed a wooden canal 650 feet long, with a slope of 1 in 10, and having divided it into equal spaces of 108 feet each, found that the water traversed all the other spaces except the first in equal times. 310. But besides the resistance which the water expe¬ riences from the walls of the pipe, and which is the most considerable, there is also the resistance arising from con¬ traction, as Eytelwein first showed. If the bores be large this resistance is insensible, but if small it is too appreciable to be neglected. Further, if the pipe have one or more bends in its length, a third kind of resistance will arise ; the loss by this resistance will evidently be greater in the case of an angular than in that of a uniformly curved tube. Bossut, for example, took a straight pipe 0-027 met. in diameter, and 16‘24 in length, and under a charge of 0325 met. obtained 0-02084cub. met. of a volume in one minute. He now coiled the same pipe six times round, and obtained a volume of 0-02040 cub. met. (Bossut, Hyd. § 659). Ren¬ nie (410) also, after the same manner, took a straight pipe half-an-inch in diameter, and 15 feetlong,and havingadapted it to a reservoir under a charge of one foot, obtained a volume of T9 cub. feet in 1 min. But having bent the same pipe so as to produce a series of concavities and convexi¬ ties in a semicircle of a radius 3‘25 in., and having fixed it to the same reservoir, he found a volume of T7 cub.feet in the same time. Urns the 14 bends diminished the waste in the ratio of 100: 89; when the charge was quadrupled, the ratio was 100: 88. Venturi long ago showed the bad effect of bends by a series of experiments on three tubes O’SS met. in length and 0‘033 in diameter; one was straight, the second was rounded at an angle of 90°, and the third was right-angled. The charge employed was one of 0'88 met., and a vessel of capacity OT37 cub. met. was filled by them respectively, in 45s, 50s, and /0s. In illustration of the same fact, Rennie took a pipe 15 feet in length and one inch in diameter, and under a charge of 4 feet, found the following volumes discharged per minute:— 1 Phil. Trans, of Royal Society of London, 1831. Experi- With a straight pipe ments on ... 15 semicircular bends ;he Motion ... 1 right angle of Fluids. ... 24 HYDIiODYNAMICS. of *, above dimension,.. 0-4175 cubic fee. Quantities of Water discharged ^taineaUn^ Ourcr . ben(js 0-3676 ... lineal Leaden Pipes, 50 jeet long, ana i men v 133 0-3318 0-1511 diameter. Experi¬ ments on the Motion of Fluids. 311. These retarding or resisting forces in the case of fluids, go by the name of friction, the word being taken from the consideration of solid bodies rubbing or sliding upon each other. As there are laws of friction for the lat¬ ter, so there are also laws of friction or resistance for the former. In the case of fluids, then, passing through straight pipes, as deduced from experiments, the resistance is—1. Independent of the pressure : thus water moving in a pipe under a head of 100 feet, experiences as great a resistance as if the head were 50 feet. Dubuat showed this law from experiments on the oscillation of water in siphons. In connection with this, see, under River, the experiment in which two vessels are connected by a siphon. 2. I he resistance is, at any one velocity, proportional to the sur¬ face exposed to the action of the flowing water. 3. The resistance varies directly as the square of the velocity nearly, the border being constant. The third law is more nearly expressed by adding the simple power of the velocity. 312. When a pipe is inclined to the horizon, as CDE (fig. 60), the water will move with a greater velocity than in the horizontal tube CT)hf. In the former case, the relative gravity of the water, which is to its absolute gravity as \\f to Cf or as the height of the inclined plane to its length, accelerates its motion along the tube. But this accelera¬ tion takes place only when the inclination is considerable ; for if the angle which the direction of the pipe forms with the horizon were no more than one degree, the retardation of friction would completely counterbalance the acceleration of gravity. Thus when the pipe CF, 16 lines in diameter, was 177 feet, and was divided into three equal parts in the points D and E, so that CD was 59 feet, CE 118 feet; and when CF was to F/as 2124 to 241, the quantity of water discharged at F was 5795 cubic inches in a minute, the quan¬ tity discharged at E was 5801 cubic inches in a minute, and the*quantitv at D 5808 cubic inches. The quantities dis¬ charged therefore, and consequently the velocities, decreased from C to F; whereas if there had been no friction, and no adhesion between the aqueous particles, the velocities would have increased along the line CF in the subduplicate ratio of the altitudes CB, Dm, Ew, and Fo; AB being the sur¬ face of the water in the reservoir. The preceding numbers, representing the quantities discharged at F, E, and D de¬ crease very slowly; consequently, by increasing the relative gravity of the water, that is, by inclining the tube more to the horizon, the effects of friction may be exactly counter¬ balanced. This happens when the angle ,/CF is about 6° 31', or when F/is the eighth or ninth part of CF. The quantities discharged at C, D, E, and F will then be equal, and friction will have consumed the velocity arising from the relative gravity of the included water. 313. In order to determine the effects produced by flex¬ ures or sinuosities in conduit pipes, M. Bossut made the following experiments:—• Altitude of the water in the re¬ servoir. Feet, inches. 0 4 Form of the Conduit Pipes.—See Figures 61 and 62. ^Quantities of j water dis¬ charged in a minute. The rectilineal tube MN placed hori¬ zontally The same tube similarly placed The same tube bent into the curvili- neal form ABC, fig. 61, each flexure lying flat on a horizontal plane, ABC being a horizontal section The same tube similarly placed The same tube placed as in fig. 62, where ABCD is a vertical section, the parts A, B, C, D rising above a horizontal plane, and the parts a, b, c lying upon it The same tube similarly placed j Cubic inches.j 576 1050 540 1030 520 1028 314. 1. The two first experiments of the preceding table show that the quantities of water discharged diminish as the altitude of the reservoir. This arises from an increase of velocity, which produces an increase of friction. 2. The four first experiments show, that a curvilineal pipe, in which the flexures lie horizontally, discharges less water than a rectilineal pipe of the same length. I he fric¬ tion being the same in both cases, this difference must arise from the impulse of the fluid against the angles of the tube; for if the tube formed an accurate curve, the curvature would not diminish the velocity of the water. 3. By comparing the 1st and 5th, and the 2d and 6th experiments, it appears that, when the flexures are vertical, the quantity discharged is diminished. This also arises from the imperfection of curvature. 4. It appears, from a comparison of the 3d and 5th with the 4th and 6th experiments, that when the flexures are vertical, the quantity discharged is less than when they are horizontal. In the former case, the motion of the fluid arises from the central impulsion of the water, retarded by its gravity in the ascending parts of the pipe, and accele¬ rated in the descending parts; whereas the motion in the latter case arises wholly from the central impulsion of the fluid. To these points of difference the diminution of velo¬ city may somehow or other be owing. When a large pipe has a number of contrary flexures, the air sometimes mixes with the water, and occupies the highest parts of each flexure, as at B and C, fig. 62. By this means the velocity of the fluid is greatly retarded, and the quantities discharged much diminished. This ought to be prevented by placing small tubes at B and C, having a small valve at their top. 315. A set of valuable experiments were made by M. Couplet, and a detailed account of them given in the Me¬ moirs of the Academy for 1732, in his paper entitled Des Kecherches sur le Mouvement des Eaux dans les Tuyaux de conduite. These experiments are combined with those of the Abbe Bossut in the following table :— 134 Experi¬ ments on the Motion of Fluids. HYDRODYNAMICS. iWfe of the Experiments of Couplet andBossul on Conduit Pipes, differing in Form, Length, Diameter, and in the Matermls of whxh they are composed,-under different Altitudes of Water in the Reservoir. Altitude of the water in the reservoir. Ft. in. lin. 13 6 0 1 2 12 12 4 20 20 11 1 9 2 7 0 3 0 11 1 4 4 8 8 4 9 0 Length of the conduit pipe. Feet. 50 50 50 50 50 50 180 180 180 180 177 118 159 1,782 1,782 1,782 1,710 1,710 7,020 7,020 7,020 7,020 7,020 3,600 3,600 4,740 14,040 Diameter of the conduit pipes. Lines. 12 12 12 12 12 12 16 16 24 24 16 16 16 48 48 48 72 72 60 60 60 60 60 144 216 216 144 NATURE, POSITION, AND FORM OF THE CONDUIT PIPES. Rectilineal and horizontal pipe of lead.. The same pipe similarly placed The same pipe with several horizontal flexures Same pipe The same pipe with several vertical flexures ........... Same pipe Rectilineal and horizontal pipe of white iron Same pipe Rectilineal and horizontal pipe of white iron Same pipe Rectilineal pipe of white iron, and inclined so that CF (ftz. 60) is to Ff as 2124 is to 241 _ Rectilineal pipe of white iron, and inclined like the last Rectilineal pipe of white iron, and inclined like the last !... Conduit pipe almost entirely of iron, with several flexures both horizontal and vertical Same pipe Same pipe Conduit pipe almost entirely of iron, with several flexures both horizontal and vertical ^ Same pipe Conduit pipe, partly stone and partly lead, with several flexures both horizontal and vertical. Same pipe Same pipe Same pipe Same pipe Conduit pipe of iron, with flexures both horizontal and vertical Conduit pipe of iron, with several flexures both horizontal and vertical... Conduit pipe of iron, with several flexures both horizontal and vertical... Conduit pipe of iron, with several flexures both horizontal and vertical... Ratio between the quantities which would he discharged if the fluid experi¬ enced no resistance in the pipes, and the quantities actually discharged; or the ratio between the initial and the final velocities of the fluid. to 0-2810 to 0-3050 to 0-2640 to 0-2910 to 0-2540 to 0-2900 to 0-1660 to 0-1770 to 0-2180 to 0-2340 1 to 0-2000 1 to 0-2500 1 to 0-3540 1 to 0-3500 1 to 0-0376 1 to 0-0387 1 to 0-0809 1 to 0-0878 to 0-0432 to 0-0476 to 0-0513 to 0 0532 to 0-0541 to 0-0992 to 0-1653 to 0-0989 to 0-0517 316. In order to show the application of the preceding results, let us suppose that a spring, or a number of springs combined, furnishes 40,000 cubic" inches of water in one minute ; and that it is required to conduct it to a given place 4 feet below the level of the spring, and so situated that the length of the pipe must be 2400 feet. It appears from the table in art. 245, that the quantity of water fur¬ nished in a minute by a short cylindrical tube, when the altitude of the fluid in the reservoir is 4 feet, is 7070 cubic inches ; and since the quantities furnished by two cylindri¬ cal pipes under the same altitude of water are as the squares of their diameters, we shall have by the following analogy the diameter of the tube necessary for discharging 40,000 cubic inches in a minute; ^7070 : ^40000=12 lines or 1 inch : 28£ lines, the diameter required. But by com¬ paring some of the experiments in the preceding table, it appears that, when the length of the pipe is nearly 2400 feet, it will admit only about one-eighth of the water, that is, about 5000 cubic inches. That the pipe, however, may tiansmit the whole 40,000 cubic inches, its diameter must be inci eased. The following analogy, therefore, will fur¬ nish us with this new diameter; V5000 : V40000 = 28-54 lines: 80 /3 lines, or 6 inches 8^ lines, the diameter of the pipe which will discharge 40,000 cubic inches of water when its length is 2400 feet. 317. The following experiments on the quantities of water ^charged by different pipes of various lengths, and with different adjutages, were made by M. Bossut at the pub¬ lic and private fountains of Mezieres in October 1779: Head of water. Ft. in. 24 23 19 19 19 10 29 1 8 0 24 7 32 7 30 5 26 3 27 0 30 0 10 5 10 11 10 0 Length of pipe. Feet. 161 192 193 188 146 187 1069 278 314 446 506 668 812 194 462 420 Diame¬ ter of pipe. Size of orifice. Lines. 12 12 12 12 12 15 18 15 15 18 18 18 18 12 12 15 Lines. n h 64 64 24 by 7 74 by 54 Two adju¬ tages, each 6 lines 34 Two adju¬ tages, having each 5 lines 2 by 64 4 54 11 5 54 7 Ratio of the real to the theoreti¬ cal dis¬ charges. 0045 0-075 0-068 0061 0-089 0-105 0-435 0-396 0-227 0-037 0-447 0-301 0-048 0-377 0-332 0-163 Ratio of the height due to the ve¬ locity to the head of water. 0-002 0-006 0-005 0 004 0-008 0-011 0-189 0-157 0-052 0-001 0-200 0-091 0-002 0-139 0-109 0-028 Cubic inches of wa¬ ter dis¬ charged in a minute. 242 230 222 237 168 S'SS 1686 458 1232 636 696 900 600 576 576 483 318. Dubuat undertook a series of experiments to de¬ termine the laws of resistance of bends, and their intensity. In order to this he employed different pipes, first straight, and measured the charge necessary to obtain a certain vo- Experi- ments on the Motion of Fluids. HYDRODYNAMICS. 135 Experi- lame in a certain time ; then bent into different forms, such merits on that the central fillet would make a ceitain number of an- the Motion anc] 0f a certain size ; and anew verified the charge of Fluids. yn(jgr which the same volume would be obtained from the bent pipes in the same time. The difference between the two charges for the same pipe, now straight, then bent, was evidently the charge due to the bends, and, consequently, the measure of their resistance. The experiments were 25 in number, the most important of which are set down in the following table:— Pipe. Diameter. Length. Metres. 00271. 0,0271 0-0271 0-0271 0-0271 0 0271 0-0271 0-0271 0-0511 0-0541 0-0541 Metres. 3-167 3-167 3-167 3-167 3167 3-749 3-749 19-95 6-910 6-910 6-910 Angles. Num¬ ber. 1 2 3 4 10 4 4 4 4 4 6 5 1 Value. Deg. 33 36 36 24-57 36 36 36 36 36 36 24-57 36-00 56-23 Velocity of water Metres. 2-300 2-300 2-300 2-300 1-939 1- 572 0-794 0-776 2- 336 1- 590 2- 336 Resist¬ ance due to bends. Metres. 00203 0-0406 0-0674 00406 0-1598 00444 0-0111 0-0106 0-0785 00360 0-2339 Coeffi¬ cient. 0-0111 0-0111 0-0123 0-0111 0-0123 0-0130 0-0127 0-0127 00099 0-0103 0-0124 Dubuat concludes from these experiments that the re¬ sistance of bends is proportional to the square of the velo¬ city of the fluid, to the number of bends, and to the square of the sine of the angle which the bends make with the straight line of direction. Mr Beardmore, in his Hy¬ draulic and Tide Tables, has added, inversely as the hy¬ draulic mean depth. Experimenters, however, are not agreed on this point (414). SECTION VII. EXPERIMENTS ON THE PRESSURE EXERTED UPON PIPES BY THE WATER WHICH FLOWS THROUGH THEM. 319. The pressure exerted upon the sides of conduit pipes by the included water has been already investigated theoretically in Prop. XX., Part II. The only way of ascer¬ taining by experiment the magnitude of this lateral pres¬ sure, is to make an orifice in the side of the pipe, and find the quantity of water which it discharges in a given time. The lateral pressure is the force which impels the water through the orifice ; and therefore the quantity discharged, or the effect produced, must be always proportional to that pressure as its producing cause, and may be employed to represent it. The following table is founded on the experi¬ ments of Bossut:— Quantities discharged by a Lateral Orifice, or the Press¬ ures on the Sides of Pipes, according to Theory and Experiment. Altitude of the water in the re¬ servoir. Feet. 1 1 1 2 2 2 Length of the conduit pipe. Feet. 30 90 180 30 90 180 Quantities of water dis¬ charged in 1 minute ac¬ cording to theory. Cubic inches. 176 190 193 244 264 269 Quantities of water dis¬ charged in 1 minute ac¬ cording to experiment. Cubic inches. 171 190 194 240 261 266 It appears from the preceding table, that the real lateral Experi. pressure in conduit pipes differs very little from that which ™^sJon is computed from the formula; but in order that this ac- of Pluidg_ cordance may take place, the orifice must be so pci foi ate , that its circumference is exactly perpendicular to the direc¬ tion of the water, otherwise a portion of the water dis¬ charged would be owing to the direct motion of the in¬ cluded fluid. . , 320. It is found by experiment that, for pipes under pressure, a velocity of 200 feet per minute is very good for working with, giving perhaps a better proportional dis¬ charge than if the pipe had a greater inclination, and con¬ sequently the water a greater speed. A velocity of 150 feet per minute will prevent depositions of mud, &c., in pipes and sewers. . . 321. At the West Middlesex Water*works, it is found that the friction of the pipes reduces the head of water be¬ tween one-fourth and one-fifth. The Grand Junction Water Company’s new engine, at Kew, works against a head of 205 feet, while the gauge on the other side of the stand, which indicates the "back pressure from London, gives only 170 feet; showing a loss of head equal to 35 feet, by the draught on the great 45-inch main. At Phila¬ delphia the friction of the pipes causes a diminution of 25 feet of head when the city is drawing water. We see from the above that in towns supplied with water there is a con¬ siderable loss of head. 322. In towns there cannot but occur a great number of bends in the supply pipes. These bends taking place, as they actually do in many cases, in a vertical plane, are sub¬ ject to two disturbances in the discharge. I he first is an accumulation of air at the top of the bends, and which can only be liberated by valves self-acting, or worked by hand at stated times, since much air enters the pipes with the par¬ ticles of water. The second is, that the diameter of the pipe over its whole length should be duly proportioned, so that it may discharge the volume due to its diameter. 1 hus, at a distance x, from the fountain head or reservoir y, the na¬ ture of the locality may be such, that the pipe at # will be a very little above the situation y, in which case the requisite volume of water will not pass out by the pipe z, lower situ¬ ated than x, or that volume due to a fall from y to z Neither can the pipe be fully effective at x, since it is not completely filled. It is clear then, that for the requisite volume to be discharged at z, the pipe from y to x must be of larger dimensions than that from x to z. The neglect of providing against these impediments has led to much in convenience and serious disappointment. It is said that when Edinburgh was supplied with water from Comiston about 1740, Maclaurin, from calculation, promised eleven times, and Desaguliers six times, more than the inhabitants received ; the latter gentleman, however, erected air vessels or chests at different distances along the main, and the city was well supplied. When the Edinburgh City Water-works were extended, about 30 years ago, and the main pipe made of iron, every precaution was taken by Mr Jardine, the en¬ gineer, to secure the proper supply. The first 18,300 feet of the main had a fall of 1 in 282, the diameter of the main being at the reservoir 20 inches, and at the end of the above distance 18 inches; the remaining distance of 27,900 feet had a fall of 1 in 97, and the diameter of the discharging main at the Castlehill is 15 inches. On the whole, the actual discharge is not greater than that which would be given by a pipe of a diameter equal to 15 inches, and of a uniform slope over the entire distance. Mr Jardine erected, at 14 different points, cast-iron vessels to receive the compressed air as it collected ; by opening a cock at each point, every three or four days the air is libe¬ rated. This was one of the earliest works in iron on a great scale, and it is reckoned a model of its kind; the cost of the works at the present price of iron would only be 136 Experi¬ ments on about that which was paid. We may judge, however the Motion t,?e.efficient nature of the iron main, when it is stated of Fluids. . at 11 . cost notlling f°r repairs since the time of its erec- v j t*on> ar,d it has not ceased to deliver a daily supply. 323. Mr W. A. Provis, M. Inst. C. E., undertook seve¬ ral experiments in the year 1838, on the flow of ivater through small pipes. The pipes employed were leaden If inches in diameter, drawn to a length of 15 feet, and sol¬ dered together with great care. The united pipe was stretched on a wooden beam, resting on upright posts in such a manner that it could be depressed or W horizon¬ tal over its whole length towards the discharging end. A stop-cock was inserted into the upper end of the pipe- the lower end fitted into a cistern 2 feet square in the bottom and 3 feet high, graduated upwards from the centre of the bore of the cock. There was a second cistern above this last which, by means of a pipe and cock, supplied the lower with water. To the lower end of the pipe was attached, by a universal joint, an open trunk or spout by means of which the water from the pipe could be turned at pleasure into or outside a receiver, the capacity of which was 4 cubic feet. By means of a valve at the bottom of the re¬ ceiver the water could be discharged. When an experi¬ ment was to be made, the highest cistern at the upper end of the pipe was filled with water, and the graduated one below it was also filled to the proper height. An assistant kept the latter vessel at the constant required level, by a continued supply from the upper one; a second assistant turned the cock which discharged into the pipe at the given signal. 1 he lower end of the spout was held by a third assistant, who turned the stream into the receiver when ordered. Before taking the result of an experiment, the water was allowed to run for some time, but after a uniform and steady motion had been acquired in the water, and the signal given, the discharge for the time was determined. , . was fmmd that considerable difference prevailed in the time required for the run of the water through the pipe owing to the dryness or moisture of the inner surface, and also by the accumulation of air inside when the pipe was level or slightly inclined. When the pipe was level and its interior nearly dry, as was the case on commencing in the morning, the time required for the water to pass throuo-h the pipe was nearly 50 per cent, more than after the tube lad been thoroughly wetted. In all the experiments where the pipe was level, or nearly so, and more especially in the longer lengths, there were frequent regurgitations of the water, owing to the accumulation of air within the pipe; the experiments, however, on the time in filling the receiver were not begun till the stream had become regular and equable. In order to guard against error, duplicate results were taken, and if any discrepancy took place in the first two results, a third was added. The mean results of these experiments are given in the following table, which showsus—1. Thatwhen the pipes were level, the volumes discharged were nearly inversely as the square roots of their lengths. 2. In comparing the dis¬ charge with that passed through the 100-feet pipe, the de- 3"r0m c on rr]e aPPears greatest in the case of the oi t pipes of 20 feet length, when under the pressure of the gieatest head of water. With a head of 6 inches, the rWW°Ui oglVt aaOU]o10°th rnore than the obserred dis- charge ; with ahead of 35 inches, the rule would give about a 9th more than the actual discharge. The intermediate heads show intermediate differences. 3. By givino- the pipes a regular and uniform descent, the discharge Is in¬ creased through the long pipes in a greater ratio than through the short ones. 4. By increasing the head of water pressing at the upper ends of the pipes, the increase of IhttTengJ? in ll’e long and HYDRODYNAMICS. Fall of Pipe. Level. 1 in 112 2 in 112 3 in 112 Lengths of Pipe. 100 feet. 80 feet. 60 feet. I 40 feet. 20 feet. Bead of Water =35 inches. (Volume discharged in one minute.) 4-528 4-776 4- 949 5- 217 Head of Water=30 inches. Level. 1 in 112 2 in 112 3 in 112 1-991 2-264 2-594 2- 909 3- 179 2-594 2- 891 3- 221 3-428 3-178 3-404 3-735 3-951 4-138 4-363 4-486 4-802 Level. 1 in 112 2 in 112 3 in 112 Head of Water=24 inches. 1-745 2-008 2-353 2-673 2-926 2-302 2-637 2- 927 3- 2 2- 823 3- 096 3-428 3-582 3-664 3- 95 4- 138 4-326 Head of Water=18 inches. Level. 1 in 112 2 in 112 3 in 112 1-476 1- 684 | 1-959 2- 106 2-324 2-461 2-637 2-774 2-944 2-394 2- 711 3- 019 3-276 3-116 3-428 3-636 3-809 Head of Water =12 inches. . 32/' As pipes are exposed to forces besides those aris¬ ing from the included water, they must be made much stronger than the preceding^ experiments would seem to require. Ihe thicknesses of iron and leaden pipes used table^1106 m 1 ^ time ^°SSUt’ are given in the following Diameter Iron Pipes. Thickness. Inches. 1 2 4 6 8 10 12 Lines. 1 3 4 5 6 7 8 Leaden Pipes. Diameter. Inches. 1 1* 2 3 4* 6 7 Thickness. Lines. 3 4 5 6 7 8 SECTION. VIII.- -EXPERIMENTS ON THE MOTION OF WATER IN CANALS. -o. By a canal is meant a regularly constructed water¬ course or channel, having a uniform bed with the same in¬ clination at every part, and containing the same volume of water over its whole length. Let a horizontal plane or right Experi¬ ments on the Motion of Fluids. HYDRODYNAMICS. Experi- line ab, be drawn through anypointff, of the bed of a canal, and ments on a vertical cb, corresporfding to any other point c, of the bed, the Motion t]ien the inclination for the length ac of the canal will he of Fluids. represented by = length ac x sine of inclination Lac. Call, then, L the length of a portion of a regular canal, D the difference of levels between the two extremities of L, then the sine of inclination of canal will always be expressed Call, again, S the section of the canal perpendicular to the axis of the current; then if the canal be rectangular, l its breadth, and h its height, or depth of water, S = Ih ; if the canal be trapezoidal, l the breadth of the bottom, and also n the slope of the lateral sides, S = (/ + nK) h = (/+^.cosa)^, where a is the inclination of the walls to the horizon. Let also c be the perimeter of the section, then for a rect¬ angular canal c = l-\-2h’, if it be trapezoidal, c = / + 2/V+ 1 = ^ + . sin a The ratio of S : c, Dubuat calls the mean radius (341). 326. When water flows in a canal, gravity is a force continually acting upon its particles. If the water be in repose, the tendency of gravity to put the water in motion is destroyed, and the surface is horizontal. But when the surface is inclined, then motion takes place among the par¬ ticles, and hence the hydraulic axiom that motion will take place among the fluid molecules of a course of water when¬ ever the surface is inclined. The inclination will apparently be the immediate cause of movement, but it is the gravity of the particles which produces it. 327. This action of gravity on the particles will be illustrated in the following cases. Let both the bed and surface of the canal be parallel, then we shall have, as it were, the case of a body sliding down an inclined plane, the particles being not only that layer in immediate contact with the bed, but those also of all the upper layers. Hence, since in this case gravity cannot act with its full intensity, so much of its effect will be lost, and the particle will slide down the bed with an intensity expressed by g sin/, where g is the accelerating force of gravity, and/the inclination of the surface to the horizontal plane. This is the condi¬ tion of all the molecules on such a canal. Let now the surface be no longer parallel to the bed, but let the former be more inclined than the latter, any fluid molecule what¬ soever traversing a length parallel to the bed will be subject to the action of gravity, together with that due to the in¬ equality of pressure at the two extremities of the length. But these two forces are together equal to g sin/. Let, again, the bed be horizontal, and the surface inclined, then the particles in contact with the bottom will have their ac¬ tion destroyed by the resistance of the bed, but every other particle not in contact with the bottom will have a moving force represented by g sin f where / is the inclination of the surface to the horizon. Let, lastly, the bed slope up¬ wards, then the particles covering the bed will be impelled upwards along the bottom, while all others will be urged downwards with a force equal to the difference between the pressures of two columns, one of which is the depth of the particle under the surface, and the other the distance from the surface of any point on the horizontal plane passing through the former particle. This difference will again be expressed by g sin / w'hich will be the moving force on the particle. 328. We see, then, that in all the above cases, each par¬ ticle, on traversing a line of any layer, is urged by a force equal to g sin f or this is the final velocity of a particle, or the accelerating force at the end of a unit of time as a se¬ cond. It evidently varies as the inclination, for g is con¬ stant. Let A be sin /, then the accelerating force will be VOL. XII. 137 g A. Now, were this accelerating force the only one acting Experi- on a fluid moving in a canal, it is evident that the motion ments on or velocity would never become uniform; for, if so, then ^ equal volumes would pass through each section in equal ^ 1S^ times. But experiment and observation show us, that ^ after a certain time, the accelerating force is imperceptible, and the water flows on with a uniform motion. Bossut, [Hydrod. § § 797, &c.), in order to prove this, took a wooden canal 200 met. long, with an inclination of 1 in 10, and di¬ vided the length into spaces of 33 met.; he found that, with the exception of the first space, the water passed over all the others in the same time. It is evident, then, that some retarding force exists whereby the accelerating force is destroyed at every instant. Whenever, therefore, this accelerating force has been destroyed, the water will move onwards with the velocity which it had at the first moment of escape. The retarding force mentioned above may be regarded as arising from the resistance of the bed. But besides this retarding force, there is another of con¬ siderable intensity; it is that arising from the resistance or friction of the sides, which is not to be neglected. Eytel- wein, to show this, took a pipe 0‘63 met. long., and at the end of 100 sec. it discharged 0T48 cub. met.; having now doubled its length, 1*26 met., the same volume was obtained in 117 sec. Hence, we have another hydraulic axiom,—when the mean velocity is uniform, the accelerating force is equal to the retarding forces. 329. We shall have an idea of the nature of these resis¬ tances by observing the motion of a stream of water; as soon as it enters its course the water spreads over, wets and clings to the surface of the bed, and the same is the case with the walls; it is over this watery coating that the whole fluid mass passes, each of its particles being affected by the first coating, and by each rubbing on another. Hence the mass takes a mean velocity. Dubuat, from a considerable number of experiments, showed that this re¬ sistance between the bed of a canal and the water passing through it, is altogether different from the friction of a solid body on another, for his results show that, in the case of fluids, the resistance of friction is independent of the pres¬ sure (311). His experiments seem to have been performed with great care and ingenuity; he tried the flow of water over glass, lead, pewter, iron, wood, and different kinds of earths, and found no variation in the friction. (Principes d’Hydraul. § § 34 36.) This inference of Dubuat is ge¬ nerally set down, in books on hydraulics, as the first law of friction in fluids. Daubisson, however, questions the truth of the law, stating that the adherence of the water is equivalent to a single force, and which may be measured, like all other forces, by a weight. He cites also one of Dubuat’s owm experiments, where a piece of white iron put in contact with a tranquil surface of water, required a force of between 4*70 and 5'07 kil. on the square metre, to withdraw it from the water. He also mentions as an objec¬ tion to it, the fundamental experiment which served Ven¬ turi to establish his principle of the lateral communication of fluids mentioned in 262. 330. The movement of water in canals is similar to that of water in pipes, the only difference being, that the one has an exposed surface, while the other has not. The fact of canals having an exposed surface offers a third cause of re¬ tardation, for the surface layer of fluid particles rubs against the lower layer of atmospheric particles. Hence, the liquid threads are not all animated with the same velocity ; those which are most distant from the walls will move quickest, and thus we should expect the particles on the surface in the middle of the canal to have the greatest velocity. This is not, however, the case; the particles moving with the greatest velocity are actually found to be a little under the surface, as we shall see, in 359, in the experiments to de¬ termine the velocity of rivers. The loss of this velocity s 138 HYDRODYNAMICS. Experi- arises from the friction of the fluid particles with those of ments on the atmosphere. Hence, also, the particles in a perpendi- Fluids1 cu^ar sect‘on °f a canal have not the same velocity, but if a niean °f all these different velocities be taken, we shall have the mean velocity of this section. Call v the mean velocity, and s the perpendicular section, then the volume discharged, or waste, in a unit of time, is Q = sv. 331. It is a matter of great importance in a practical point of view to determine the ratio of the mean velocity to the velocity of the surface. A knowledge of this relation has always been considered of great value by hydraulicians, and many experiments have been undertaken for the purpose. Dubuat is to be trusted on this head. He made thirty- eight experiments on two wooden canals, 43 metres long; the form of one was rectangular, and 0-487 metres broad, the section of the other was a trapezium, the least base of which was 0-156 met., and the sides inclined at an angle of 36° 20 to the horizon : the depth of the water varied only from 0"054 metres to 0"273 metres, and the velocity was from 0"16 to 1-30 metres. The deductions of Dubuat from these ex¬ periments are, that the relation of the velocity of the surface to that of the bottom is greatest when the mean velocity is least; that the ratio is wholly independent of the depth ; the same velocity of surface always corresponds to the same velocity of the bed. He observed, also, that the mean velo¬ city is a mean proportional between the velocity of the sur¬ face and that of the bottom. Call v the mean velocity, u the velocity of the bottom, and V that of the surface, then Dubuat’s results may be represented by the equations, u = (V V - 0-165)2, and (V + M) = (\/y-0-082)2 +000677. M. Prony has discussed Dubuat’s observations, and has adopted the formula v=V-3o • V "f- o* 1 uo The corresponding 0-25 0-50 1-00 1- 50 2- 00 0-77xV 0’79x V 0-81xV 0-83xV 0-85xV values of V and v are set down in the annexed table. M. Prony takes a mean term, and for practice makes ?; = 0-8 x V, so that, for the mean velo¬ city of a current, it will suffice to diminish the surface velocity by one- fifth. Hence, the mean velocity of water flowing in a current is equal to four-fifths the superficial velocity.1 332. When the surface of a current flowing into a lon£ and regular canal takes at last a constant inclination, whicl is the same as that of the bed, in which case they will botl be parallel, then all the transverse sections will be equal, and the mean velocity will be the same in each. The watei moving in a canal under such circumstances is said to have a uniform motion. But when the inclination of the sur¬ face varies from one point to another, the surface is no longer parallel to the bottom, and so at divers points of the canal the transverse sections, and, consequently, the veloci¬ ties also will vary. Nevertheless, since the volume of water entering the canal, and taken at any point, remains the same, the section of the fluid mass will be constant, and the velo¬ city will have at all times the same value. Everything, in¬ deed, will be unchanged, and although we shall not have a uniform, there will at least be a permanent motion. 333. A canal, with the exception of canals employed in inland navigation, may receive supply at its head from a reservoir, basin, or portion of a river, the level of which is raised for this purpose by dikes or banks. When the head ol the canal, at the point where it receives the supply, isopen. it is called a canal with a free entrance ; when it is fur¬ nished with a sluice, it is termed a sluiced canal. 334. In the case of a canal with a free entrance, the water on entering forms a fall; its level lowers, then gradually rises by gentle undulations ; beyond the influence of which it as¬ sumes a form nearly plane and parallel to the bed, the in- Experi- clinations being regarded as constant. The velocity accel- ments on erates during the lowering of the fall, retards while it is ris- t*ie Motion ing from the surface, and at last becomes sensibly uniform. of I'luids- Dubuat found that when the motion became uniformly regular, the velocity of the surface was nearly that due to the entire height of the fall, and that the height due to the mean velocity is equal to the difference between the height of the reservoir and that of the uniform section. {Principes d'Hy- draul., §§ 177 et 178.) The fall which is formed at the en¬ trance of a canal diminishes the depth of the uniform sec¬ tion, and lessens the volume of discharge. Hence, if a canal receive all the water that it is destined to convey, the fall must disappear. Dubuat also infers from his experiments on this subject, that the velocity and the uniform section establish them¬ selves at a certain distance from the reservoir, in the same manner as if uniformity commenced at the beginning of the canal. {Principes, § 177.) 335. The force of a current necessary to move a machine depends not only on the volume of water which it conveys, but also on the height from which it may fall. This force will be measured by the product of the volume and the height of the fall. The greater inclination that is given to a canal, and the more we augment the volume, a factor of the above product, the other factor, the fall, will be dimin¬ ished for the same time ; so that the product, increasing at first with the inclination, will diminish when the inclination is increased. There will thus be a maximum force, which it is very important to determine, and to put in practice. Thus, a volume of water equal to 1T86 cub. met. issues from a canal having a fall of 4-50 met., the effective fall being 4"06 met.; the product of these two quantities is 48" 15, the corre¬ sponding inclination being 0’001045. But when the inclina¬ tions 0-0015,0"002, 0-0025, and 0*003 met. are tried, the cor¬ responding products will be 52-65, 54-68, 54-93, and 54-01. The fall of 0*003 met. has already given a diminution ; and if the fall of0-0026 met. be tried, the corresponding product is 54"88 met. Wherefore, the maximum effect in this case will lie between the inclinations of 0-0025 and 0-0026 met. 336. When a canal (333), furnished with a sluice, re¬ ceives water by the opening which is established at its head, it happens either that the upper edge of the opening is not completely and permanently covered by the water passing into the canal, or that it is so. If the charge over the centre of the orifice be greater than twice or thrice the height of the orifice, the upper edge will not be covered by the water, and the waste will be the same as if the canal did not exist. Bossut, for example, fitted on to a reservoir, having an orifice near the bottom, of dimensions 0 027 met. high, and 0-135 met. broad, a horizontal canal of the same sectional area, but 34 met. in length ; the charges under which the escape took place were 3*80 met., 2-50 met., and T20 met., and he received at the extremity of the canal the same volume of water which it had taken in as when the canal was away altogether. {Hydrod., § 750.) The reason of this equality is, that when the water is forced along by means of a strong charge, and consequently with great velocity, the tendency of the vein to contract beyond the plane of the orifice renders the section smaller, and thus, on issuing from the orifice, it touches neither the sides nor the bottom of the canal; it is thus, as it were, projected into air, and the discharge remains the same as if this really took place. But beyond the contracted section, the fluid vein expands, and the resistance which it receives when coming in contact with the walls causes a diminution of flow. Where the contact of the walls takes place, however, the distance is too great from the orifice to react against the passing vein, and no reduction will arise in the waste. The dis- 1 See Prony’s Jaugeage des Eaux Courantes, 1802. Experi¬ ments on the Motion of Fluids. HYDRODYNAMICS. 139 charge will always be expressed by the formula already given in 183, ml'Uw 2gH, where l' and K are the breadth and height respectively of the opening; m having the same values as for orifices in a thin plate. 337. When, again, the charge is feeble, the opening is covered, and the water issuing from the sluice comes in con¬ tact with the walls of the canal, and suffers a retardation which it communicates to the fluid as it passes the opening. The waste, and therefore also its coefficient, are less in this than in the previous case. It sometimes happens, that when the charge is small, the sluice has no sensible effect, and the same volume may be given either when the sluice is wholly raised, or when it is plunged a little into the water. If, however, the depth at which it is plunged be considerable, and if the fluid vein on issuing be entirely covered by still water (as in fig. 49), the height due to the velocity wfill be the differ¬ ence between the elevation of the two fluid surfaces. The depth at the sluicergate is found by taking the height of the water in the canal when the movement has become very regular, the depth close to the sluice-gate being very small. If then h be the depth of water in the canal, H' the height at least of the sluice-gate above the sill of the entrance, the waste of the opening of the sluice-gate, and, consequently, that of the canal, will be expressed by Q = mlK\f ‘lg (IT — K) ; but the expression for the discharge when the velocity has be¬ come sensibly uniform is (7 2736^-0033 c ) where S and c area s above, and p the sine of inclination maVsTODD.') = S (2736 ^ -0-033) , Experi¬ ments on the Motion of Fluids. which is the general equation relative to canals furnished with a sluice-gate at their head. 338. The experiments of the Abbe Bossut were made on a rectangular canal 105 feet long, 5 inches broad at the bot¬ tom, and from 8 to 9 inches deep. The orifice which transmitted the water from the reservoir into the canal was rectangular, having its horizontal base constantly five inches, and its vertical height sometimes half an inch, and at other times an inch. The sides of this orifice were made of cop¬ per, and rising perpendicularly from the side of the reser¬ voir, they formed two vertical planes parallel to each other. This projecting orifice was fitted into the canal, which was divided into 5 equal parts of 21 feet each, and also into 3 equal parts of 35, and the time was noted which the water took to reach these points of division. The arrival of the water at these points was indicated by the motion of a very small water-wheel placed at each, and impelled by the stream. When the canal was horizontal, the following re¬ sults were obtained Velocity of Water in a Rectangular Horizontal Canal 105 feet long, under different Altitudes of Fluid in the Reservoir. Altitude of the water in the re¬ servoir Ft. 11 Ft. 7 Vertical breadth of the orifice ' J inch. Time in which the number of feet in column seventh are< run through by the water... Sec. 2 5- 10- 16- 23 + £ inch. Sec. 3- 7 13- 20- 28 + Ft, 3 J inch. Sec. 3 + 9 17 + 27 + 38 + Ft. in. 11 8 1 inch. Sec. 2 4 7 11 16* Ft. in. 7 8 1 inch. Sec. 2 + 5 9 14 20 Ft. in. 3 8 1 inch. Sec. 3- 6 + 11 + 18 + 26 Space run through by the water. Feet. 21 42 63 84 105 339. It appears from column 1st, that the times succes¬ sively employed to run through spaces of 21 feet each, are as the numbers 2, 3-, 5, 6, 7 + , which form nearly an arithmetical progression, whose terms differ nearly by 1, so that by continuing the progression we may determine very nearly the time in which the fluid would run through any number of feet not contained in the 7th column. The same may be done with the other columns of the table. If we compute theoretically the time which the water should employ in running through the whole length of the canal, or 105 feet, we shall find, that under the circum¬ stances for each column of the preceding table the times, reckoning from the first column, are 6‘350, 7‘834, 11 ’330, 6‘350, 7‘834, 11*330 sec. It appears, therefore, by compar¬ ing these times with those found by experiment, that the velocity of the stream is very much retarded by friction, and that this retardation is less as the breadth of the orifice is increased; for since a greater quantity of water issues in this case from the reservoir, it has more power to overcome the obstacles which obstruct its progress. The signs + and - affixed to the numbers in the preceding table, indicate that these numbers are a little too great or too small. 340. It is of the utmost importance to determine the form of canal which will convey the greatest possible vo¬ lume of water under a given area of transverse section. In order to this it must be remembered, that the volume con¬ veyed along the canal is greatest when the transverse sec¬ tion of the fluid mass is greatest, and the wetted perimeter least. A figure, therefore, must be selected, which, under the same perimeter, presents the greatest surface. By geometry, we know the regular polygons fall under this class of figures; and as a circle is nothing else than a polygon with an infinite number of sides, circular and semi-circular channels are also included in it. But when a semi-poly¬ gonal figure is chosen for the channel, the utility diminishes as the sides of the polygon diminish. The most easily exe¬ cuted are the regular semi-hexagon, the semi-pentagon, and the semi-square. 341. The question of figure then for canals which will convey the greatest volume of water, is reduced to taking, among all the trapeziums with sides of a determinate slope, that one which has the greatest section for a given wetted perimeter; or (which is the same thing), that which has the greatest hydraulic mean depth. We shall find that this section is a semi-hexagon. The transverse area, there¬ fore, or S = (^ + nhfh (see 325). This expression is to be a maximum, and, consequently, its differential will be zero; dS , , dl _ . .% -jj =l-\-h-~jj-\'2nh^=0'i dk dh or, h .dl + l.dh-lt-2nh .dh = 0. But (325) c=l-\-2h\/«2+ 1 is to be differentiated, and c is a constant; .*. = 0 = ^ + 2\/ra2 + 1; or, 0 = <7/ + 2 . c/A . aA*2 +1 » dh dh and on substituting the value of dl from the former in the 140 HYDRODYNAMICS. the maximum discharging ments^n ^ltter eclliation> we Jlave /=2A (\/ rf+l —n)-, giving / also theMotion *ts va^ue in ^ie expression for the transverse section, we of Fluids, have S = A2 (2\/rc2 + 1 -w) ; so also c = 4/<\/ri1 + ] —2nh. _ S _ h2 (2\f ril + 1 -n) _hL_ c 2//(2\/«‘2+1 — n) 2 hydraulic mean depth (325) ; wherefore, in all trape¬ zoidal channels of the best form with certain given slopes and area, the hydraulic mean depth is one-half the depth of the w'ater. The transverse section of channel may be thus ob¬ tained. Suppose that ABCD (fig. 63) is the regular chan¬ nel required, draw EB, EC, dividing the section into tri¬ angles, of which AEB, EDC are equal in every respect; and let EP, ER, EQ be perpen¬ diculars upon AB, DC, and BC from E. Then we have S 4 „ c=2’°rS = = AB EP 2 EP + DC ER + BC ^=(AB + BC + CD)|; EP h or (AB + BC + DC)—=(AB + BC + CD)£; —; or, /< = EP. A circle, then, with E as centre, and radii equal to EP, EQ, or ER, will pass through P, Q, and R. Generally, therefore, to find the maximum dis¬ charging section, describe a circle with any radius, draw a tangent to serve as the base of the section parallel to the horizontal diameter, and from the extreme points of the base draw two tangents of the requisite inclination till they meet the horizontal line ; the figure comprised by the three tangents will be the transverse section required. The dotted tangents mo, rp, and the base po, mark another sec¬ tion for the same thing, but with the sides sloping at a dif¬ ferent angle. Mr Neville gives this construction in his Hydraulic Tables, p. 129. 342. Canals for inland navigation, aqueducts, and wooden canals or courses for conveying water to manufactories, are invariably made of a rectangular form, owing to the sim¬ plicity, facility, and economy of their construction ; but the semi-hexagonal section is that which conveys the greatest volume of water. 343. M. Genieys, in his Essais sur les Moyens de Con- duire, d'Elever, et de Distribuer les Eaux, pays particular attention to the inclination of canals and aqueducts. He endeavours to find that velocity which best suits the nature of the soil, but specially one that w’ould maintain the salu¬ brity of the water. He gives 35 centimetres, or 13*75 inches per second, for the minimum velocity. M. Girard, in his Rapport sur le projet general du Canal de VOurcq, adopts a less velocity; he proposed at first to regulate the inclination of the Canal de 1’Ourcq according to the law represented by the co-ordinates of the funicular polygon (see Mechanics) ; but the inclinations per metre for the upper (0*0000625 met.) and lower (0*0001236 met.) part of the canal w'ere found insufficient. Dubuat thought that the smallest inclination capable of maintaining the mobility of water is 1 in 1,000,000; the motion is scarcely perceptible at 1 in 500,000. W hile experimenting on an artificial canal set to 1 in 9288, he found the mean velocity to be nearly 6 inches per second, and < inches per second in a drain near Conde inclined at 1 in 27,000. The most recent observations on the ancient aqueducts show that the inclination varied from 1 in 432 to 1 in 648. The fall of the new river or canal which conveys water to London is only 0*25 feet per mile, or 1 in 21,120; its motion, about one-half mile per hour, is too small, since Experi- during summer the temperature of the water is raised. ments on 344. The practical application of a fluid such as water^°^on flowing through orifices in the sides or bottoms of vessels, ° u^ds,y in pipes, and open canals, or over weirs, is of the utmost * importance. Besides those instances which have already been mentioned for the purpose of illustration, we may state the following. An example, on a large scale, of water issu¬ ing through an orifice is to be found in the sluices con¬ structed in tidal harbours for sweeping away at low water the deposit that generally accumulates there. Were it not for some effectual remedy of this kind, many of the most important tidal harbours on the English coast would have been long ere now completely silted up. Smeaton intro¬ duced these sluices into Britain from the low countries. He threw an embankment across some part which was wholly covered at high water, so that at the ebbing of the tide a considerable volume of water might be caught in a reser¬ voir. At low water the sluices in the bank w ere drawn up, and the water allowed to escape among the mud. But this method soon fell into disrepute, as the area of the back¬ water itself soon became silted up. Smeaton, however, im¬ proved upon his original plan, by erecting a second bank altogether or nearly perpendicular to the first, by which the back-water was divided into two areas, each of which was made to cleanse the other, while both kept the harbour clear. The harbours of Ramsgate, Dover, and Hartlepool, are familiar illustrations of this method. (See Smeaton’s Reports, vol. ii., pp, 202-209; and Sir John Rennie On Harbours.) Other examples are seen in the filling of canal locks, and in the supplying of manufactories and other works from city pipes. In the latter case, a very small orifice is generally perforated in a disc, which is closed up so as to secure it from any unfair interference. But perhaps one of the best instances of water flowing through orifices is to be found in districts watered by means of canals. Many examples of this kind are to be found in Captain Baird Smith’s w'ork on Italian Irrigation. In the irrigated districts of Italy it was long a matter of import¬ ance to determine the unit of volume of water, and some means of regulating the due supply to each proprietor; so that, on the one hand, neither the government nor landlords might be defrauded, nor, on the other, occupants of lands suffer any injustice. The earlier units were at first only ori¬ fices of a fixed area in the side of the canal, without any reference to the head or charge under which the issue took place; but the variations of the water-level in the canal, afterwards made it necessary that a constant pressure be maintained. The unit on the canal of Caluso was called ruote or wheel, and was defined as a square, the side of which is equivalent to 1*6702 feet: the upper edge of the outlet is locally said to be a jior di acqua, or level with the surface of the canal or reservoir, the discharge hence tak¬ ing place under no pressure. The modulo, or volume per second discharged by Xheruota, was 11*83 cubic feet. The volume measured by this ruote, w hich was introduced by F. D. Michelotti, was afterwards reduced to 10*84 cubic feet by his son Ignazio. Another of these units is the oncia magis- £ra/eof Milan; it is 0*655 feet high, 0*3426feet broad, and has a constant pressure of 0*32944 feet over the upper edge of the outlet. The orifice is cut in a single stone slab, and that it may not be unfairly made use of, is girded by an iron ring. The modulo or volume of the oncia magistrate, as applied upon the Naviglio Grande, distributes 1851 cubic feet per second over a course of 31 miles. The honour of its discovery is due to Soldati of Milan, about the year 1571. It appears that for summer irrigation each cubic foot of water distributed per second suffices to water 61*8 acres, and that the annual rent for this volume is equivalent to L.13*25. HYDRODYNAMICS. 141 Ex i- 345. Great improvements have taken place in these out- ments on lets since they were first applied. One of the simplest and the Motion most beautiful is that founded on the effect of the double of Fluids. cistern. It is identical with fig. 49 of Prop. XV., the only ' clifference being that in the vertical side of FE, an orfice in that side discharges in the open air. 346. Captain B. Smith gives us, in the case of the Grand Ganges Canal, an example on a very magnificent scale, of water flowing through an orifice. This canal, which was lately opened, has a course of 898 miles, is navigable throughout, and waters a district of country equal in area to 5,400,000 acres. The inclination of this canal is 1 in 3520, its depth is 10 feet, the breadth of its bed over the whole length is 140 feet, and it is intended to convey 6750 cubic feet per second. The slopes are not mentioned, but at from P5 to 1, calculation would give a volume of 7316 cubic feet. The inclination of this canal may, from its vast dimensions, be regarded as considerable, and such that the resisting velocity would wear down its sides, but it is supposed that this is prevented, and consequently the velocity diminished, by the rapid growth of aquatic plants on its bed, which is a serious impediment on all canal works. 347. M. Girard feared that the growth of plants would be an element in retarding the velocity of the water flow- in the Canal de 1’Ourcq, and adopted the inclination of 0‘0000305 met., or 1 in 947. 348. As an example of water flowing in pipes, we need only mention the supplying of cities by mains and culverts or tunnels. The Croton Water-works supply the city of New York by a culvert, the section of which is not unlike the dotted fig. of 341 ; it is covered over its entire length, which is a means of preserving the water pure, and of a low temperature; its fall is 13^ inches, or 1T25 feet per mile; the waste is 60,000,000 gallons every 24 hours, or 11T1 cubic feet per second. 349. The projected supply from Loch Katrine for the city of Glasgow is to be conveyed by means of a culvert 8 feet in diameter, and inclined at l in 6336. The valleys which intervene are to be passed by a 48-inch cast-iron main ; the fall over the whole length will be 1 in 1000, or 5‘28 feet per mile. 350. It is a very important matter also to have, both for cities, manufactories, and for irrigating purposes, a constant in¬ variable discharge. The late Mr Thom, hydraulic engineer to the Gorbals Water-works, near Glasgow, devised an apparatus by which a constant discharge might be maintained through an orifice with a constantly varying charge over its centre. 351. The application of the subject to the case of weirs may be seen in the waste-boards thrown across rivers and streams. When weirs are seen in rivers, salmon-gaps are always made in the board, so that the fish may get up the stream. A very ingenious application of weirs is to be seen on the Manchester Water-works. The reservoirs are there supplied in part by the mountain streams, which, in rainy weather, carry down mud and filth, rendering the water unfit for domestic use. Hence the necessity of construct¬ ing weirs across several of these streams, to carry away the turbid water. In fine weather these supplying streams con¬ vey clear water, and discharge it by a weir at the top of a stone wall, which is a side of a reservoir open at the top. The opposite side of this reservoir is built at such a dis¬ tance from the former that, in rainy weather, when the stream comes down with violence, its velocity urges it across the reservoir altogether, and all the dirty water is then conveyed to a compensation-pond, which supplies the mills of manufactories. Before and after its greatest velo¬ city much muddy water would enter the reservoir, did not a man attend and put on a cover over the top. SECTION IX.-—FLOW OF WATER IN RIVERS. 352. It is only recently that the motions of rivers have been made the subject of scientific study ; it may be said Experi- to date only from the year 1665, when the celebrated con- ments on gress of philosophers met by appointment of the Roman the Motion and Florentine governments, to put an end to the quarrels ° ^ u1^ , which had taken place among the inhabitants bordering the Yal de Chiana (the ancient Chesina Palus). Ihe Chiana, lying between the Tiber and Arno had been alternately pushed backwards and forwards, till at last the district had become a noxious marsh. It was this same river which gave rise to the famous controversy in the Roman senate, when it was proposed to prevent the inundations of the Tiber, by throwing the Chiana into the Arno. What was once a marsh, however, is now one of the most fertile dis¬ tricts in Italy (10). 353. On the resistance of irregular forms and slopes of river beds, Dubuat made several experiments which are worthy of notice. He took different kinds of earths, sands, and stones, and placed them successively on the bottom of a wooden canal; on inclining the canal at different angles he varied the velocity of the water, and, therefore, also ob¬ tained a measure of the material set in motion. Metres. For white clay the measure was 0’08 ... fine sand 0-16 ... gravel of the Seine, size of a pea 0-19 ... gravel of the Seine, size of a bean 0-32 ... sea pebbles, an inch in diameter 0-65 ... flint stones, size of a hen’s egg LOO He afterwards covered the bottom of the canal with a layer of sand, and the sand moved with the water under a velocity of 03 met. After some time, the sand presented a series of beautiful undulations or ridges 0T2 met. broad. The grains of sand, forced on by the current, rose to the tops of the ridges, and after falling down by their own weight to the base of the next ridge, were again lifted to its summit. He found that half an hour was required for a par¬ ticle to traverse a complete ridge, so that the rate of motion would be about 6 met. in twenty-four hours. It is in this way that the grains of sand move over the Dunes by the impulsion of the winds. 354. The effect of the velocity of the water in carrying away particles from the bed of a river will depend on their tenacity and size. With respect to the size, the volumes or weights of similar bodies decrease faster than their areas; and the pressure or force urging a body down a stream being proportional to the transverse section, is relatively greater the less is the volume ; hence, the smaller the par¬ ticles the less is the velocity required to move them. Mr Beardmore gives in his Hydraulic Tables the limit of bot¬ tom velocities in different materials. 30 feet in 1 minute will not disturb clay with sand and stones. 40 feet in 1 minute will move along coarse sand. 60 feet in 1 minute will move along fine gravel. 120 feet in 1 minute will move along rounded pebbles. 180 feet in 1 minute will move along angular stones. When the beds of rivers, however, are protected by aquatic plants, they will bear higher velocities than those just now mentioned. 355. When the bed of a river is broad and deep, and the water moves slowly, the surface of the fluid will be nearly horizontal; but under a rapid current, in places where the river contracts, the surface assumes a very de¬ cided inclination. In a very decided slope of the surface to the horizon, the fluid surface becomes convex ; it is con¬ cave when the inclination towards the horizon has dimin¬ ished very much. Were the bed horizontal, and its out¬ line constant, there would be an accelerated motion corre¬ sponding to the whole convexity of the surface ; and a re¬ tarded one for the concavity. Were the bed uniformly in¬ clined, there would only be an accelerated motion so long as the successive values of the inclination of the surface to the horizon were greater than that of the bed ; otherwise, 142 Experi¬ ments on the Motion of Fluids. HYDRODYNAMICS. the motion would be re notwithstanding the convexity tarded. 356. The inequalities of the bottom have some influence on the form of the surface of the current. In general, the inequality at the surface will be smaller compared with that at the bottom, as the water is deeper and the velocity greater. Sometimes, also, in times of great inundations, when dikes about 8 feet high are covered, the surface is equal and the water passes over without any sensible depression. 357. The transverse section, then, of the surface of a river, presents the appearance generally of a convex curve, the summit thread being that which may be considered as having the greatest velocity. On each side of this fluid fila¬ ment, the level lowers as the sides are approached by a quantity sometimes equal, sometimes unequal. The velo¬ city also of the different parts of the current is large, and their respective elevation is considerable. According to Dubuat, the principle which is exempli¬ fied in such a form of fluid surface, is as follows :—If, from any cause whatsoever, a fluid column comprised in an in¬ definite fluid, or contained between solid walls, should move with a given velocity, the pressure which it exercises Jate- rally by its own motion against the surrounding fluid, or against the solid wall, will diminish that pressure which is due to the velocity with which it moves. (Principes, § 453.) Consequently, the molecules of the fluid threads, as also the surrounding ones, moving more quickly than those near the borders, exercise against them a feebler pressure, and a very large number or a higher column of them would be required to make an equilibrium. On this principle, however, philosophers are not generally agreed. 358. \ arious methods have been devised by different experimenters for measuring the velocity of running water, either at or under the surface. The velocity of the sur¬ face may be simply and directly found by means of a float, made of any substance the specific gravity of which is the same or a little heavier than that of water. No part of the body must, if accuracy is required, be exposed to the at¬ mosphere. If the current flows regularly for a considerable distance, the float will be carried uniformly with the stream ; and if we count the number of seconds elapsing between the float passing the extreme points of the interval, we know at once the rate of velocity per second, from the ex¬ pression for uniform motion. 359. If to this float, which is supposed to be under the surface, we attach by a silken string a body specifically lighter than water, as a ball of pith of elder, part of the sur¬ face of which will be exposed to the atmosphere, and place both bodies in the middle of a current, it will be found that the pith-of-elder ball will be a little behind the one under the surface; which shows that the threads of fluid that flow fastest are not on the surface, but at a small distance, or rather immediately under it. This velocity, however, may be called that of the surface. 360. Bossut’s ivheel {Traite d’Hydrodynamique, § 665), similar to that in fig. 64, will also enable us to determine the surface velocity of running water. It is not, however, so correct an instrument as the float already described (358), for the friction of the screw, the resistance of the at¬ mosphere, and the weight of the wheel, enter as elements of resistance. I he small wheel WW should be formed of the lightest materials. It should be about 10 or 12 inches in diameter, and furnished with 14 or 16 float-boards. This wheel moves upon a delicate screw aB, passing through it» axle B5; and when impelled by the stream it will gra¬ dually approach towards D, each revolution of the wheel corresponding with a thread of the screw. The number of revolutions performed in a given time are determined upon the scale ma, by means of the index Oh fixed at O, and moveable with the wheel, each division of the scale bein" equal to the breadth of a thread of the screw, and the ex^ tremity h of the index Oh coinciding with the beginning Fig. Cl. of the scale, when the shoulder h of the wheel is screwed close to a. The parts of a revolution are indicated by the bent index mn, pointing to the periphery of the wheel, which is divided into 100 parts. When this instrument is to be used, take it by the handles C, D, or when great ac¬ curacy is. required, make the handles, regarded now as pivots, rest in grooves properly supported; and screw the shoul¬ der h of the wheel close to a, so that the indices may both point to 0, the commencement of the scales. Then, by means of a stop-watch or pendulum, find how many revolu¬ tions of the wheel are performed in a given time. Multiply the mean circumference of the wheel (or the circumference deduced from the mean radius, which is equal to the dis¬ tance of the centre of impulsion or impression from the axis &B), by the number of revolutions, and the product will be the number of feet through which the water moves in the given time. (Ferguson’s Zec^res.) Dubuat used a fir wheel of this kind very successfully. (See his Hydraul, § 441.) 361. Another instrument by which we can determine the surface velocity of water is the pendulum, which con¬ sists of an ivory or hollow metal ball fixed to a thread, the other end of the thread being tied to a graduated quadrant. Ihe quadrant is placed above the surface, but the ball is under the water; the force of the current drags the ball with it, and the string receives a certain inclination, the fixity of the machine itself balancing the force of the cur¬ rent. The surface velocity, as deduced by this instrument, is equal to the product of the square root of the tangent of inclination, and a constant, or v = n\/tan i, where v is the velocity required, n the constant, and i the inclination of the thread to the vertical. Venturoli mentions this and other pendulums. Zendrini1 showed with this pendulum that the velocities in different parts of the section of the River Po were as the square roots of the heights, when the velocities are not very great. This has been confirmed by many succeeding experimenters. 362. I o measure the velocity of running water below the surface, the tube of Pitot is the simplest instrument.2 Pitot’s tube is one ot glass, bent nearly at right angles, and expand¬ ing in a funnel-shape at the lower end, which is to be plunged into the water to the required depth. If the water be in a state of rest when the instrument is plunged into the water, the orifice being right against the current, then the level within and without the tube will be the same ; but if there be a current in the water, a column of fluid will ascend the vertical part ot the tube, and be a counterpoise to the force of the stream, which impels the column upward. It is natural to suppose that if the depth of the layer the velocity of which is required, be h the fluid column, the velocity will be expressed by v = */2gh. But this is not the case, for the pressure exercised on a body plunged in water is de¬ pendent on its form, and further, the pressures of the divers Experi¬ ments on the Motion of Fluids. 1 Leggi, Fenomeni, Regolazioni ed Usi delli Acque Correnti. Aquarum Fluentium Mansur a, lib. iv. HYDRODYNAMICS. 143 Experi- fluid fillets around the central one diminish from the centre ments on to the circumference of the vein. Hence the necessity of the Motion iso]ating, if possible, the central fillet at any depth, so as of Flmds- to determine its velocity. Dubuat, from these considera- tions, gave the tube a funnel-shape at its lower end, and closed up this orifice by means of a plate, piercing only its centre by a small hole. When the tube thus arranged was plunged to any depth in water, it was found that two-thirds only of the elevated column in the tube was the height due to the velocity, and not as above the whole height; or v = s/'lg .yi — 6‘55 \/ k feet. (Bossut’s Hydrant, \ 572.) 363. Brlinnings devised a kind of balance which he named a Tachometer, or a measurer of velocity. The water at the required depth impinges on a vertical plate fixed to a horizontal rod, the extremity of which has attached to it a string passing upwards, and tied to a rod above the surface. This latter rod is kept in the horizontal position by means of a moveable weight, which, from its position on its arm, measures the velocity. 364. But of all instruments for measuring the velocity of a current at any depth, the most accurate is regarded as the Mill of Woltmann, which was described and made use of by him in 1790. The instrument, represented in fig. 65, consists of a small wheel with 2, 3, or 5 plane fins of consider¬ able breadth, fixed by their radii to the main axis M, of the instrument. The beam M, carrying the wheel, is placed parallel to, or right against the direction of the stream ; and the fins of the wheel are obliquely set with respect to the water; so that, as soon as the water impinges against the fins, the wheel will begin to rotate, and that more rapidly as the velocity of the stream increases. The number of turns that the wheel makes in a given time will enable us to determine the force of the current at any depth. In order, however, to obtain such a result, the beam M has an end¬ less screw G, under which is a toothed wheel, which works into the screw. To the left of the toothed wheel is another, put in motion by a pinion fixed to the first, but moving much more slowly than it. The axes of both wheels B, B, have their extremities fitted into a piece C, moveable round its left end, but a rod E is employed to elevate or depress the right extremity of this sort of lever, in order to put the toothed wheel in communication with the endless screw G, or remove it. When the rod E is not pulled upwards, the lever-beam C lowers itself under the action of a spring F, whereof the upper part is attached to the frame of the apparatus ; the toothed wheels B, B, also, and at the same time, lower themselves, and are caught by two projecting pieces A, A, which insert themselves into their teeth, and so prevent the wheels from turning round. The whole apparatus, by means of the ring N, slides down Experi- a long pole to the required depth, and is there fixed by the merits on screw S ; the pole D being made fast in the river. The ^0*\on long rod D being then in the river, and the mill fixed at the v° 8) proper part of its length, and the beam in the direction of the ~~ V~^J stream, the water will in the course of a few seconds produce a uniform motion of the fins, and no sooner has this taken place than the rod E is drawn up, which necessarily lifts the toothed wheels, and places one of them in connection with the endless screw of the beam, i.e., with the fins. The apparatus is now allowed to be at work for a certain definite time, as one second, when the rod E is then let down, and the toothed wheels necessarily fall, and are caught by the projecting pieces A, A, which prevent them from turning after the communication has been stopped. The instru¬ ment is then drawn up, and the positions noted that the points A, A hold on the wheels, which will denote the num¬ ber of teeth that the wheel to the right has turned round during the time of the experiment; and this number will indicate the turns that the wheel has made ; for, as the beam turns round once, so does the screw, and one turn of the screw is equivalent to one tooth of the wheel passed over. If we neglect the small amount of friction in this appara¬ tus, the velocity of the stream is proportional to the velo¬ city of the fins, and this last to the number n of turns which the wheel makes in a unit of time ; or to N, the re¬ volutions it makes in T seconds of time, N v = a . n = a — ; T where a is a constant coefficient for the same mill, and to be determined by experiment. We can determine a, by counting the number of turns which the wheel makes in a given time when it is placed in a current of a known or uniform velocity, or by moving the instrument with a given velocity through a mass of still water ; then, on dividing the number of turns by the time, we obtain the number of turns in a unit of time, and this being the divisor of the known or uniform velocity, will give o. Since a is thus known, and is a constant quantity for the same mill, it will suffice to count the number of turns the mill makes to di¬ vide it by the time taken in revolving, and let this quo¬ tient be multiplied by a, the product of which will give the velocity required. The rapidity with which the mill turns under the action of a current, the velocity of which is 1 metre per second, depends on the dimensions and disposition of the fin. The palettes are generally thin, square copper plates, 0*025 met. in the side, and their radii 0*05 met. in length; the angle which their plane makes with the axis M is 45°. 365. These stream-measurers show us the curious fact, that the velocities vary at different points in the same trans¬ verse section; that the velocity diminishes, as we have already said (330), on approaching the bed, and its sides. The law of this diminution must be stated. The doctrine, however, was only taken up by philosophers after the year 1730; for, previous to that time, the common belief was that advanced by Guglielmini (in his work entitled La Misura dell' Acque Correnli, published about 1695), who supposed that the velocity at any depth of a river was as the square root of that depth. He regarded every point in a fluid mass as tending to move with the same velocity as it would do on issuing from an orifice; and, therefore, he inferred that the layer which has the greatest velocity must be that at the bed or bottom, and the layer of least velocity that at the surface, besides a continual acceleration from the river as it moves. But Pitot, in 1730, from a series of experiments on the River Seine, which he had made with his tube (362), showed that the velocities followed a law the very opposite of that advanced by Guglielmini; that they diminished from the surface on nearing the bed.1 1 Memoires de VAca.dtm.ie des Sciences dc Paris, 1732. 144 HYDRODYNAMICS. Experi¬ ments on the Motion of Fluids. Briinnings, in 1789 and 1790, Ximenes, and other hy- draulicians, undertook series of experiments to determine the law of diminution of the velocity. Briinnings’ were con¬ fined to branches of the Rhine traversing Holland; at each station he took, by the Tachometer which he had constructed for this purpose, the velocity at the depth of every foot. From these results—‘which may be seen in the following: table— Names of Rivers. Depth. Velocity of Surface. Mean. Ratio of mean to surface velocity. Waal Waal Lower Rhine.... Lower Rhine.... Higher Rhine,.. Issel Issel Lower Rhine Waal Lower Rhine Higher Rhine... Lower Rhine Lower Rhine Lower Rhine.... Lower Rhine.... Waal Waal Higher Rhine .. Met. 1-57 1- 57 1-88 2,ol 2- 51 2-82 2-82 282 3- 45 3-45 376 3-76 3- 76 376 4- 08 4-39 4-39 4-39 Met. 0-670 0-708 0-874 1-001 1-097 1-283 1-289 1-307 1-025 1-379 1-307 1-397 1-416 1-433 1-484 1-184 1-226 1-467 Met. 0-627 0-664 0-779 0-926 1-058 1-218 1-243 1-259 0-938 1-320 1-220 1-286 1-361 1-369 1-341 1-068 1-131 1-332 0-934 0-938 0-892 0-925 0-965 0-965 0-965 0-963 0-915 0-957 0-936 0-921 0-962 0-954 0-934 0-902 0-923 0-908 Woltmann inferred that on reckoning from the surface the velocities diminished as the ordinates of a reversed para¬ bola. Funk, considering the same table, supposed that the velocities followed the logarithmic curve, that is to say, that as the depths increase in arithmetical progression, the velocities diminish in geometrical progression. But M. Raucourt, from a series of experiments on the Neva, at St Petersburg!], has represented the velocities on the same vertical by the ordinates of an ellipse, the smaller axis being vertical, the lower extremity being under the bottom, and the upper a little under the surface.1 M. Defontaine, however, from experiments on the Rhine with Woltmann’s mill, gives the law of the diminution of velocities in the following terms:—In general, and in proportion to the depth under the surface, in a river, the velocity of the water gradually diminishes, at first insensibly, then more and more percep¬ tibly, and increases very rapidly on nearing the bottom, where the velocity is almost always more than half the velocity at the surface. The curve may be easily repre¬ sented by laying off on a vertical, lengths proportional to the depths, and horizontal lines proportional to the corresponding velocities of the table. The curve ap¬ proaches nearly to an arc of the para¬ bola, the ordinates of which are the velo¬ cities, diminishing by a constant quantity.2 366. These experiments of M. Raucourt on the Neva, and those of M. Defontaine on the Rhine and its affluents, are among the most important made on rivers in modern times. The object of M. Raucourt was to ascertain how far the law of velocities of water in pipes coincided with that in open channels, when a river, for example, was frozen, and when free from ice. During the winter, therefore, of 1824, when the Neva was frozen, a part of it was chosen, which was 900 feet wide, and 63 feet deep, with a section very regular, so that this part of the river was, as it were, an immense pipe. Several holes were now made in the ice till the water was reached, and an instrument like the com- Depth. Met. 0-00 0-20 0-40 0-60 0-80 1-00 1-20 1-40 Velocity. 1-226 1-218 1-198 1-167 1-125 1-057 0-950 0-880 mon ship’s log sent down; the maximum velocity was found to be a little below the centre of each vertical, and diminished as either bank was neared. After repeated trials, the relative1 velocities were found to differ only by ^th from each other. The greatest velocity was found to be a little below the centre of the deepest vertical, and = 2 ft. 7 in. per second ; Velocity near the top, =1 ... 11 Velocity near the bottom, =1 ... 8 During the summer of 1826 Raucourt commenced anew his experiments on the same river, both in calm and windy weather: when calm, the maximum velocity was the same as the surface velocity ; when windy, the acceleration was greater or less. Detrem and Henry give, in the Journal des Votes de Communication for 1826, an account of the experiments which they undertook for the purpose of veri¬ fying the results of Raucourt. They found that the ratio of the mean to the superficial velocity was as 0-715 : 0-903 ; that the maximum velocity diminished from the upper to the lower part of the river from l-79 to FOlo met.; and that the volume of the Neva per second was 3284-54 cub. met. The inclination also was found to be 1 in 37078. 367. Tlie object of M. Defbntaine’s experiments was the execution of certain works which were intended to restrain and regulate the course of that part of the Rhine adjoining the French territory. That part of the Rhine to which Defontaine mainly directed his attention, is comprised be¬ tween Basle and Neubourg. The river here is very irregular in its motion, owing to the islands and sand-banks; its in¬ clination also is very variable. The greatest slope is near Basle, at low water, owing to the rocks : during times of floods, the inclination decreases by four-fifths its value. In the mean state of the Upper Rhine the inclination is 1 in 1037; while at the frontier below the confluence of the Lauter, after a course of 224-460 met. along the Fi’ench shore, it is 1 in 2534, or nearly a third part of the former. The total fall being taken at 143’935 met., the mean in¬ clination is 1 in 1545, which is nearly that of the river at Brisack and Sponeck. Besides the valuable information re¬ specting this river which is to be found in Defbntaine’s work, Travaux du Rhin, we have the velocities of the river at different parts of it course. The following table shows that the decrease of velocities is irregular, and that they do not follow the law of the square roots of the inclinations :— Names of Places. Basle Huningen In the angle of Krembs ... ... Schalampe. Opposite Vieux Brisach.... At Sponeck At Artolsheim At Rhinau At Guerstheim At the Bridge of Kehl At Offendorff At Drusenheim At Beinheim Limit of Bavarian frontier. At Mannheim Velocities per second. Low Water. Metres. 1-65 1- 70 1-88 2- 67 1-81 1-52 1- 97 2- 51 2-19 1-50 1-40 1-49 1-24 0-97 0-70 Mean Water. Metres. 2-25 2-75 2-62 2-79 2-15 2-87 213 2-25 1-97 1-73 1-56 1-20 High Water. Metres. 416 3-60 2 85 2-30 368. M. Defontaine made also a series of experiments with Woltmann’s mill on the velocities of the Rhine in dif¬ ferent sections ; in the determination of which an extent of 60 met. was traversed, and a float was used, so suspended that its specific gravity did not exceed that of the water. The results are seen in the following table:— Experi- ments on 'he Motion of Fluids. 1 Annales des Fonts et Chaussees, tom. iv., p. i., 1832. 2 16., tom. vi., 1833. 145 HYDRODYNAMICS. Experi¬ ments on the Motion of Fluids. Experiments on the Velocities of the Rhine in different Sections. Velocities at different parts of the section. At the surface Metres. At 0‘10 below surface ... 0-20 ... 0-30 ... 0-40 ... 0-50 ... 0-60 ... 0-70 ... 0-80 ... 0'8347 intersection of the two divisions ... ODO below surface ... 1-00 ... 1-10 1 or from bottom J At bottom No. of turns of instru¬ ment in 30 seconds. 68 67^ 65| 63$ 62 61A 59 58 52$ 49$ 44 Space passed through in 30 seconds. Met. 29-308 29020 28-111 27-345 27-024 26-291 25-429 24-998 22-682 21-281 18-964 Velocity per second. Met. 1-0000 0-9769 0-9673 0-9370 0-9115 0-9008 0-8764 0-8476 0-8333 0-7563 0-7094 0-6321 Mean velocity per second. Surface of the section of motion of the different strata. Met. 0-9959 0-9769 0-9578 0-9388 0-9198 0-9008 0-8817 0-8627 0-8437 0-8371 0-7867 0-7094 0-6321 0-5548 Met. 1-0131117 Mean velocity per second. 0-84426 Mean velo¬ city deduced after for¬ mula of that of surface. Min. 0-81189 Experi¬ ments on the Motion of Fluids. Defontaine deduces from these results,—Is/, That the greatest velocity is at the surface; 2d, That the velocity, diminishing at first insensibly, decreases rapidly towards the bottom, in a ratio dependent on the nature of the bed; 3c?, That supposing two right lines to pass through the extre¬ mities of four ordinates, determined by experiment, and conveniently chosen in the curve, which should pass through all the points obtained, the ordinates of these right lines, corresponding to the velocities observed in the other points, will differ little in the numerical expression of these veloci¬ ties ; 4//i, That the point of intersection of two right lines, which each partial surface of partial motion circumscribes, has for its ordinate a numerical value, which differs very little from the mean velocity expressed by the quotient of the surface of motions, divided by the depth of water; 6th, That the mean velocities resulting from the preceding ob¬ servations are greater than the mean velocities adduced from the velocity of the surface by means of the formula adopted for gauging streams ; Qth, That the position of the ordinates, which expresses the mean velocity of each surface of partial motion, is nearer the bottom than the surface, or fds of the depth, reckoning from the surface, and half the depth when the bottom is very regular (Rennie’s Reports'). 369. It appears from Briinnings’ table (365) that there is a gradual though small diminution (about iVh) between the surface and mean velocity; the relation ranges be¬ tween 0’93 and 0‘96. Ximenes found this relation from his experiments on the Arno to be 0’92 ; and Defontaine, from his experiments on the Rhine, about 0’87. For great rivers, however, the relation is a little above 0‘90. In all the preceding tables, which contain the mean and sur¬ face or maximum velocity, the former will be found to be nearly equal to f ths of the latter ; and conversely, by adding ^th or so of the mean to itself we find the surface velocity. 370. In gauging a river, a station is selected, and sound¬ ings of the vertical transverse section at that point are taken. The transverse area is divided into partial areas, each of which is calculated. Then by means of a boat and Woltmann’s mill, the mean velocity at each of the places where soundings are taken is deduced from five, six, or seven direct experiments. The mean of these mean velo¬ cities gives the mean velocity of the river, which, multiplied by the sum of the partial areas, or the whole area of the tra¬ pezium, will give the waste of the river. In order to find an approximate gauge a station may be selected on the river, the bed of which, for some hundred yards, is very regular. From a few soundings the area of a transverse section is determined. By means of a float, the VOL. XII. velocity of the fluid thread in the length taken is found, and consequently of that in the measured section. M. Prony’s formula (331) furnishes us with the mean velocity of the section, the product of which, with the area, will be the discharge required. 371. The following table illustrates pretty correctly, by its velocities and inclinations, the nature of the rivers of Great Britain, which frequently in their course embrace nearly all the eight descriptions :— Velocity in feet Inclination in Characteristics of Rivers. per minute. inches per mile. 1. Channels where the resistance from the bed and other obstacles equal the current acquired from the de¬ clivity, so that the waters would stagnate were it not for the im¬ pulse of back water 50 to 120 2-00 to 5-28 2. Rivers in low flat countries, full of turnings and windings, and of a very slow current, subject to frequent and lasting inundations 60 12"18 3. Artificial canals in the Dutch and Austrian Netherlands 30 to 40 2-00 to 9-05 4. Rivers in most countries that are a mean between flat and hilly, which have good currents, but are subject to overflow ; also the up¬ per parts of rivers in flat coun¬ tries 90 15,84 5. Rivers in hilly countries, with a strong current, and seldom sub¬ ject to inundations ; also all rivers near their sources have this decli¬ vity and velocity, and often much more 130 19'8 6. Rivers in mountainous countries, having a rapid current, and straight course, and very rarely overflowing 180 24-37 7. Rivers in their descent from among mountains down into the plains below, where they run torrent- wise 300 31-68 8. Absolute torrents among moun¬ tains 480 37'27 SECTION X.—ON THE INFLUENCE OF HEAT ON THE MOTION OF FLUIDS. 372. In all the experiments related in this chapter, and in those of the Chevalier Dubuat, which are given in the ar¬ ticle Water-works, the temperature of the water em¬ ployed has never been taken into consideration. That the T 146 Experi- fluidity of water is increased by heat can scarcely admit of the Motion 8 Plutarch informs us that the clepsydrae or vvater- of Fluids. c^ochs went slower in winter than in summer, and he seems v ^ > to attribute this retardation to a diminution of fluidity. It is therefore obvious, that warm water will issue from an aperture with greater velocity than cold water, and that the quantities of fluid discharged from the same orifice, and under the same pressure, will increase with the temperature of the fluid. Hence we may discover the cause of the great discrepancy between the experiments of different philosophers, performed in different climates and at different seasons of the year. 373. M. Dubuat and M. Girard are the only persons who have made experiments on this interesting subject. M. Dubuat employed tubes of a large diameter, and hence the effects of heat were not very conspicuous. The fol¬ lowing table contains the results which he obtained :— Experiments on the Motion of different Fluids, at different degrees of Temperature, in Tubes of Glass. HYDRODYNAMICS. Names of the fluids. Rain water Salt water Salt water Salt water Alcohol ... Mercury... Mercury... Mercury.. Rain water Rain water Rain water Rain water Alcohol... Alcohol... Mercury.. Mercury.. Mercury.. Mercury.. Alcohol ....j Diameter and length of the pipe. Head of water above the top of the tube. Horizontal tube 2-9 lines, or 0'24166 of an inch in diameter, and 36'25 inches long Horizontal tube 2 lines, or 0-16666 of an inch in diameter, and 36'25 inches long Horizontal tube line in diameter, and 34-16666 inches long... 2-0833 20833 2-0833 4- 9166 5- 0000 0-8124 0-9166 2-1944 8-875 15-2916 15-2916 15-2916 5-292 5-875 1- 125 2- 7082 5-1666 0-0555 9-292 Height of the ex¬ panse in a minute expressed in inches. 5-2777 5-1666 5- 2222 9-25 7-5833 3-75 40833 6- 6111 5- 2777 6- 9166 7- 0833 7-2013 2- 50 3- 8338 1-75 3- 00 4- 25 0-0000 1125 Velocity in a se¬ cond in inches. 13-057 12-7823 12- 9197 22-8845 18- 7611 9-2775 10-1021 16-3558 27-455 35- 980 36- 847 37- 461 13- 005 19- 941 9-103 15-606 22-108 0-000 10-402 Degrees of heat above the freezing point. 3 3 11 10 to 11 12 10 to 12 10 to 12 10 to 12 55 30 36 56 12 12 10 to 12 10 to 12 10 to 12 10 to 12 12 Hence our author concludes that the velocity of water diminishes as its temperature approaches to that of the freezing point, and vice versa ; that salt water has a less velocity than rain water, that alcohol runs slower than wa¬ ter, and mercury more rapidly. 374. I he general result of M. Girard’s experiments has been already given in the History of Hydrodynamics. His experiments were made with copper tubes of exactly the same internal diameter, and drawn upon steel mandrils ; and he employed two sets of these tubes of different dia¬ meters. I he first set consisted of tubes whose length was tivo decimetres, and diameter 2*96 millimetres, and they screwed into each other so as to form tubes of various lengths, from 20 to 222 centimetres. The second set con¬ sisted of smaller tubes, whose diameter was 1'83 millime- ties. rhese tubes were then fixed horizontally in the sides of a reservoir, which was a cylinder of white iron 25 centimetres in diameter, and 5 decimetres high. The re- seivoii was kept full by the usual contrivances; and the water discharged by the tube subjected to trial was re¬ ceived into a copper vessel horizontally, whose capacity had been accurately ascertained. The filling of the vessel was indicated by the instant when the water which it con¬ tained had wetted equally a plate of glass which covered almost the whole of its surface, and the time employed to Experi- fill this vessel was measured with great accuracy. The merits on temperature of the water was also carefully noted. The Motion results thus obtained amounted to 1200, and were arranged Huid8. by M. Girard into thirty-four tables, according to the differ- ent circumstances of the experiment. When the capillary tube has such a length, that the term proportional to the square of the velocity disappears in the general formula, the velocity with which the fluid is discharged is affected in a very singular manner by a variation of temperature. D the velocity is expressed by 10 when the temperature is 0 of the centigrade thermometer, the velocity will be so great as 42, or increased more than four times, when the temperature amounts to 85° centigrade. When the length of the capillary tube is below the above mentioned limif, a variation of temperature exercises but a slight influence upon the velocity of the issuing fluid. If the length of the adjutage, for example, is 55 millimetres, and if the velocity is represented by 10 at 5° of the centigrade thermometer, it will be represented only by 12 at a temperature of 87°. In conduit pipes of the ordinary diameter, a change of tem¬ perature produces almost no perceptible change in the ve¬ locity of efflux. M. Girard also found, that the quantity of water discharged by capillary tubes, varied not only with the fluids which were used, but with the nature of the solid substance of which the tubes were composed. SECTION XI. INDIVIDUAL EXPERIMENTS. 1. Experiments of M. Hachette. 375. 1 he experiments of M. Hachette were communi¬ cated to the National Institute in 1816. The first thing that engaged his attention was to determine what effect the figure of the orifice in a wall or plate had upon the waste in a given time. Making trial of circular, triangular, and elliptic apertures, and one formed of a circular arc and two straight lines, he found that when the areas of the opening and pressure are constant, the volume discharged is the same: but when he made use of an aperture with re¬ entrant angles, the waste was either in excess or defect. He found, also, that when the plane in which the aperture is pierced is not horizontal, the issuing fluid vein describes a curve, which is a parabola corresponding to a certain initial velocity. 376. The ratio of the contracted area to that of the ori¬ fice was particularly attended to. It appears that the smallest contraction observed, and which answered to the smallest aperture, was 0-78 of the orifice. The diameter of the orifice was 0-039 of an inch ; but for diameters in excess of 0'39 of an inch, the contracted section was nearly constant, ranging between 0-60 and 0-63. The con¬ traction varied a little with the altitude of the fluid, but was independent of the direction of the jet. Another result reached by M. Hachette was that, all things remaining the same, the waste is a minimum when the surface in contact with the fluid is convex; when the sur¬ face is plane it increases, and is a maximum when the sur¬ face is concave. The waste was found to vary about ^th, according as one or other side of the plano-convex copper disc containing the orifice was turned towards the fluid ; sometimes it was greater. 377. With respect to the form of the fluid vein when the aperture was a regular polygon, each side of the poly¬ gon became a base, not of a plane but of a surface, convex externally from the orifice to the contracted sec¬ tion. I he concavity of the surface, after having reached a maximum, diminishes near the contracted section ; beyond which it changes, in consequence of the velocity acquired, into a sensible convexity, so as to show a salient edge where HYDRODYNAMICS. Experi- before there was a hollow. The hollow and the salient edge ments on succeeding it are produced on the middle of the side, and the Motion are situated in a perpendicular plane. If the orifice present of Fluids. jn jtg outline a re-entrant angle, an edge, hollow at first and then convex, passes by the summit of this angle. 378. M. Hachette next made experiments on additional tubes, that is, on tubes fitted into the orifice. These were to explain the fact of cylindrical tubes in orifices giving a greater discharge than through a simple orifice. His object was to show that the attraction of the sides of the pipe was the principal if not the main element in producing this. The fluid employed was mercury, and the pipe of iron. When the mercury was pure, the flow took place as through a simple orifice, for the iron had no affinity for the fluid ; but when impure, the discharge increased, for the walls were wetted. Again, when he greased or waxed the interior of the pipe, the flow was as through a simple orifice. When the dis¬ charge, however, was continued for some time, the wax got wet, the water filled the tube, and the discharge increased. 379. The phenomena respecting the discharge of a fluid into a vacuum was observed by this experimenter. From his experiments on this subject under the exhausted re¬ ceiver, it appears that no increase in the discharge by pipes takes place. In order to show this, a full stream flowed through a tube under the receiver of an air-pump ; when the pressure of the remaining air was reduced to 23 centi¬ metres, the external pressure being 76 centimetres, the fluid vein was seen to detach itself from the sides of the tube. As the air within was more and more rarified, the effect of the external pressure increased, and, at the same time, was transmitted to the pipe by means of the fluid contained in the vessels, add to which also the pressure of the fluid itself. But on repeating the experiment in air, he required over the orifice a column of water equal to 22-8 met. high, to detach the vein from the sides of the tube; the external pressure being still 76 centimetres. Hence, the difference, as measured by water, between the superior and inferior pressure was 22‘8 — 1033 = 12‘47 met., or equivalent to 91 centimetres of mercury. If in this rarified state of the receiver, the external air be re-admitted within it, the water does not begin to flow again in a full stream as it did at first; the detachment of the vein from the sides of the pipe continues, as it did under the exhausted receiver, although the full pressure of the at¬ mosphere is now acting on the water. From experiments of this nature Hachette concluded that adhesion of the fluid to the sides of the tube takes place only at the commencement of the motion, before the fluid has acquired a sensible velocity in a direction which sepa¬ rates it from the side. He verified this in the following manner:—He allowed water to flow in a full stream bya pipe outside the receiver of an air-pump, when on making a small hole in the pipe near the orifice, the external air entered the pipe, interposed itself between the fluid and the sides of the pipe, the contraction took place inside the tube, and the water ceased to flow in a full stream. The little hole was now shut, but the adhesion of the water and the pipe was not again produced, the flow taking place as if the pipe had been removed. 380. Besides making experiments on long and short tubes emanating from the side of a reservoir, he took the case of a pipe penetrating the orifice inside the vessel containing fluid; and found that when the inserted end of the pipe was very thin, the effect was the same as when the orifice was made in a plate convex towards the inside of the vessel, the waste by such a pipe necessarily diminishing. 381. In order to show that the contraction of the vein diminished with the height of the fluid, he made an orifice 27 millimetres in diameter, and, under a pressure of 15 centimetres, obtained a contraction of about 0'40, or a contracted section of 0-60; while the same orifice, under 147 a pressure of 16 millimetres, gave only a contraction of Experi- 0-31. Hence, since the vein contracts as the pressure { increases, the vein in passing through a pipe may be made ^ Fluids! to detach itself altogether from the sides of the pipe, as has . r_ ^ j been already stated. 382. When the pressure or head of water over the orifice is very small, the fluid vein assumes a particular form, very different from what it had before, and Hachette came to the conclusion that it was independent of the outline of the orifice. He observed these particular forms with orifices and pipes of all figures and sizes ; they go by the name of secondary veins. 383. Besides experimenting on water, Hachette employed other fluids passing out of orifices and pipes. The pheno¬ mena of mercury he found to be the same with those of water. Alcohol, a more volatile fluid than water, flows out more readily; and, consequently, a smaller pressure is required to detach its particles from the walls of the pipe than for those of water. When oil was used, its vis¬ cosity increases very considerably the duration of flow through small orifices. In the case of an orifice 1 milli¬ metre broad, the time of flow was three times greater than for water. The discharge, indeed, by a fine tube a milli¬ metre broad, and 5 centimetres long, was, with oil, drop by drop, but when water passed through the same pipe there was a fine stream. The head of oil was 1 met. high. 384. Hachette also made experiments to show the effect of the medium in which the experiments were made ; how it modified the pressures on the orifice when a flow took place ; and how it opposed a certain resistance to the dis¬ charge or motion of the fluid. He also experimented on the impediment to the motion of water arising from the fluid vein impinging on fixed planes, placed at different dis¬ tances from the orifice. A vein issued out of a large vessel by a circular horizontal opening 20 millimetres in diame¬ ter, and was received in a vessel at some distance from the orifice. The level of the fluid in the vessel was depressed about 6 decimetres in 10ra 20s. The plane face of an obsta¬ cle at different distances from the orifice was then pre¬ sented to the jet impinging perpendicularly. The distances in millim. were 128, 80, 50, 24, 4 ; the times in sinking six decim. were respectively 10m218, 10m 25s, 10™ 263, ilm 13s, 15“ 24s; which shows that, at the distance of 128 millimetres, or 5 inches, the obstacle pre¬ sents no sensible effect; but at 4 millimetres, or 0'157 of an inch, the time is increased rather more than one-half. 2. Experiments of Dr Matthew Young relative to the dis¬ charge of fluid through additional tubes. 385. Dr Young’s paper containing an account of these experiments will be found in the 7th volume of the Tran¬ sactions of the Royal Irish Academy. The most interest¬ ing part of the memoir is that relating to the increased dis¬ charge through additional tubes. They were performed about the year 1798. When a tube, mnrs (fig. 66), is in¬ serted into the vessel A BCD, it is found that the velocity is increased nearly in the subduplicate ratio of the length of the pipe when the tubes are short; and that it approaches nearer to that subduplicate ratio, according as the length of the pipe is increased. The explanation of this increase of velocity is somewhat difficult, since the water cannot issue at rs with a greater ve¬ locity than it enters the tube at mn; and it does not appear how the velocity of the fluid can be increased by the in¬ sertion of a tube in its bottom. In order to explain this, we must consider that the weight pressing down the plate HYDRODYNAMICS. 148 Experi- mn is the weight of a fluid column emvf, together with ments on the atmospheric column of the same sectional area, while |.|le UpWar[| pressure on the plate mn is a corresponding ° U1_ column of air, less the weight of a fluid column mnsr; hence ” v-*- [he plate mn is pressed down by the weight of a fluid co¬ lumn efsr. The velocity, then, with which the fluid lamina mn will issue through the orifice mn, will be the same as through the orifice rs in the vessel A&cD ; or that which a heavy body would acquire in falling down through the verti¬ cal height er ; and the same will be the case for all the lami¬ nae between mn and rs; for they cannot descend faster, since otherwise a vacuum would be left in the tube, which cannot take place owing to the upward pressure of the atmosphere. The velocity of escape will be the same, whatever be the pressure of the atmosphere, provided only that the weight of a column of air, of a base rs, and a height equal to that of the atmosphere, be either greater than or equal to the weight of the fluid cylinder mnrs. This might be proved expe¬ rimentally by inserting a pipe in the bottom of a vessel of water or mercury, and the whole placed under the exhausted receiver. Let x be the defect of the measure from the standard altitude, it will determine the pressure of the air on the mercurial surface ; let also y be the height of the mer¬ cury in the vessel above the upper orifice of the pipe, and l the length of the pipe, then the whole downward pressure on the plate of mercury which is immediately in the upper orifice of the pipe, is x+y, and the upward force pressing the same plate or layer of mercury is x — h the difference between these two quantities or forces equals the absolute force pressing that plate downwards, and will be expressed by y + / so long as x is greater than /; if ar = /, then x — l=0, and the force pressing the plate downwards is x+y = l+y', hence, therefore, no variation in the time of efflux will be perceived while the height of the mercury in the gauge or measure is equal to or less than the difference between the length of the pipe and the standard altitude. Let x be less than l, then there is no upward force; and as before the force pressing the plate downward is x-\-y, which varies as x when y is constant, and which will therefore decrease as x decreases ; if x vanish or is equal to nothing, or when the receiver is absolutely exhausted, the force is y, and the time of efflux will be the same as if the pipe had not been inserted in the bottom of the vessel. 386. In order to test his theory, Dr Young inserted a tube 7'8 inches long, in a cylindrical vessel, closed the ori¬ fice of the pipe, and filled the vessel to a depth of 6 inches with mercury ; he then placed the whole apparatus under the receiver of an air-pump, the barometer being at 30 in., and the gauge at 28‘5 ; the time of efflux was found to be 26 seconds: when the experiment was repeated under the same circumstances, but in the open air, the time of efflux was found to be 19 seconds. Now, since the gauge stood at 28’5 inches, the defect a: was 30 —28*5 = 1*5 ; and as the pressure on the mercurial plate was 6+ 1#5 = 7'5, but in the open air was 6 + 7'8 = 13'8, therefore the ratio of the velocity of efflux in both cases, which is the same as the inverse ratio of the times, was as VLd : a/13:8 = 2-73 : 3-71 = 19 : 26 nearly. rl he times of efflux were the same in the open air and under the exhausted receiver, except when the gauge stood higher than 22,o inches ; i.e., unless the height of mercury in the gauge exceeded the difference between the length of the pipe and standard altitude. In another experiment which he made, the gauge standing at 27‘9, and the baro¬ meter at 29'9 inches, the defect was found equal to 2, and the pressure was 8. But Vs = 2-828, and = 3-71, now 2-828 : 3"7 = 19 : 24 nearly; by experiment the time of efflux was found to be 23 seconds. When the efflux is made in vacuo, the pipe is not filled during the efflux, as it is while the discharge is made in the open air. Since the water column in pipe mnsr adds to the pressure which the plate mn sustains, by diminishing the up- Experi- ward pressure of the air through the pipe, it appears that it ments on produces this increase of pressure in the plate mn alone, t^le ^°^on without producing any lateral pressure in the water on a level with mn; for, by inserting a pipe in the side or mC, the velocity of escape would not be affected, and, therefore, the plate mn, immediately over the orifice of the pipe, is the only one on the same level the tendency of which downwards is increased by the insertion of the pipe. Wherefore, the fluid particles of the edge of the aperture w’ill issue through the orifice mn perpendicularly, since they have their vertical pressure increased by the weight of a column mnsr, while the lateral pressure is unchanged; the sides also of the tube mnsr will prevent the converg¬ ing tendency of the particles, and, therefore, on both ac¬ counts, the volume of water discharged through a pipe thus inserted, will exceed that discharged through a simple orifice in a ratio greater than the subduplicate of the height of the w'ater. If the pipe be lengthened, the ratio of the volume actually discharged to that determined by theory, will also increase, since the ratio of the perpendicular to the horizontal pressure increases in the ratio of the sum of the depth of the vessel, and length of pipe to the depth of the vessel. Hence in experiments of this sort, results will more nearly coincide with those of theory than when made with a simple orifice, except when the tube is so long that the friction of its sides will retard the fluid; or when so short that the particles have not acquired a vertical di¬ rection. All this agrees with the experiments of Mr Vince, an account of which is given in the Phil. Trans, for 1795. Mr Vince, e.g., inserted a tube a fourth of an inch long into a cylindrical vessel twelve inches deep, and found that the velocity did not sensibly differ from that through the orifice ; the cause of which was that the stream did not fill the pipe, but that the vein contracted as if it flowed through a simple orifice ; when the pipe was half an inch long and inserted into a vessel of the same depth, the velocity from this pipe and from the orifice was in the ratio of 4 : 3 nearly; whereas, by theory, it is \/l2-5 : \/12 = 49 : 48 nearly. Now, if 49 : 48 be increased in the ratio of 7 : 6, since the latter is the ratio of the diminution of velocity, and the contraction either nearly or entirely vanishes in a pipe, it will give the ratio of 3’57: 3. When the pipe was one inch long, the ratio of the velocity from the pipe and from the orifice was as 4 : 3 nearly ; whereas, by theory it is ex¬ pressed by -\/l3 : \/l2 = 26 : 25 ; and if 26: 25 be in¬ creased in the ratio of 7 : 6, we have the ratio of 3*64 : 3. When Mr Vince employed longer pipes, the velocity of efflux by experiment approached nearer to that which ought to have been discharged by theory ; hence, in long pipes, he says, the difference between theory and experi¬ ment was not greater than what might have been expected from the friction of the pipes, and other retarding causes. On inserting a pipe of the same diameter with the aperture which terminated in a truncated cone fixed in the orifice, he expected from this arrangement, that the volume dis¬ charged in a given time would be less than otherwise, since the water issuing through the orifice would have room in the enlarging cone to form the vena contracta; but the result was, that the same volume was discharged as if the pipe had continued throughout of the same diameter with the orifice. The reason of this is, that the pressure of the air will not allow the truncated cone to remain partly empty, as it would if the vena contracta were formed; hence, it continues full, and, therefore, the water will pass through it in the same manner as if the water in the cone surrounding the pipe were congealed. 387. Mr Vince next inserted into the bottom of the vessel a perpendicular pipe in the form of a truncated cone, the narrow end being in the orifice, and found that the efflux HYDRODYNAMICS. 149 Experi- increased more than if he had inserted a cylindrical pipe of ments on the same length, the diameter of which was equal to the the Motion narrowest section of the conical tube. Mr Vince explains of Fluids. j.pjs on t|ie came principle as that by which we account for the swelling of the diameter of a vertical fluid vein, flowing through a simple orifice with a considerable velocity. For when a vertical pipe is inserted, the velocity of discharge beino- increased, the resistance from the air will be so also, and thus the diameter of the vein tends to enlarge itself. Now, the truncated cone pipe, the wide end outwards, is just a pipe to admit of this thickening or swelling of the vein ; and the water in escaping discharges a larger volume, and with an increased velocity than when through a straight pipe; whereas, in the cylindrical pipe, the fluid cannot enlarge itself, and, thus confined, the efflux must be re¬ tarded, and the volume discharged in a given time dimin¬ ished. Accordingly, under the receiver of the air-pump, with even a moderate degree of exhaustion, there is no difference observed between the velocities with which a fluid is discharged through a conical or cylindrical pipe. Dr Young made also several experiments on the con¬ traction of veins, for an account of which see vol. ii. of the Irish Academy. 3. Experiments of Poncelet and Lesbros. 388. The experiments of Poncelet and Lesbros were made at Metz, in the years 1827 and 1828. The series was a very extensive one on the expenditure of water through rectangular orifices of considerable dimensions; and as they were undertaken by order of the French go¬ vernment, no expense was spared in making them as com¬ plete as possible. The objects which the experimenters had principally in view, were to ascertain the exact measure of the coefficient of contraction, and to determine the forms of the fluid veins under different charges and areas. 389. In order to get a correct form of the vein, several veins were projected on the plane of the orifice. T hese projections were taken by means of an iron rod, having, over nearly its whole surface, threads of a screw, and end¬ ing at its lower extremity in a delicate point, which was put successively in contact with every point of the exterior surface of the jet. The screw worked perpendicularly into a wooden nut, and which, when the screw was acting, glided along one side of a rectangular or octagonal frame of wood, placed between the orifice and the vena contracta. The orifice that especially claimed their attention while taking these projections, was a square of 02 met. in the side, and the mean charge over the centre was P68 met. This orifice was selected, because the jet spouted with much stability, its dimensions were such as to admit of manipulating very accurately, and because of its distinctness. Projections, then, of the jet from this orifice were taken first of all at a distance of 005 met. from the plane of the orifice ; but they confined themselves to the space between 0-064 met. and 0-50 met, since the former was too near, and the latter was just at the limit where the chances of error begin to multiply. At the distance of 0-05 met., however, the jet was perfectly stable. The error in taking the projections did not exceed a millimetre. Two of those veins projected are represented in fig. 67. ACEG is the square orifice of 0'20 met. in the side, and under the charge P68 met.; at the distance of 0-15 met. from the orifice, the section of the vein was abcdefgh', but at the distance of 0’30 met. the jet had the form represented by abcdef gh. This last, of all the nine Experi- proiections taken, had the least section; its area was to that of the orifice as 0-562: 1, while the ratio of the real to the ^Motion theoretic waste was 0'605 : 1 ; they would have been equal, v ^ if the velocity at this the least section had been that due to the height of the reservoir. The particles b, d!,f, h, in the plane of the section of the vein, are those which issue from the middle points, B, D, F, H, of the side of the square. The section, also, of the vein is apparently a kind of square, the angles of which correspond to the middle points of the sides of the orifice, or that it has turned round part of a revolution. The vein dUd’f 'Ji made an eighth of a re¬ volution. A phenomenon of this kind taking place in a vein issuing from an orifice not circular, is known by the renversement, the turning or inversion, of the fluid vein. 390. In the course of experiment it was observed, that as the height of the fluid in the reservoir diminished, the phenomenon of the vein turning also diminished ; that is to say, that the mass of particles all round the central axis gradually approached that axis, more so on the upper part of the vein, for gravity acting on all the fluid particles of the vein bends the whole mass, especially the horizontal sheets. Poncelet and Lesbros could not observe, as Ha- chette and other experimenters had done, spiral fluid threads crossing each other at certain angles on the surface of the vein, nor the successive swellings and shrinkings of Savart and Bidone. The former they attributed to very fine ridges on the lower edge of the orifice; and the reason why the latter were not seen was owing to the small extent of vein observed. 391. With respect to rectangular orifices, where the breadth exceeds the height, the turning of the vein was less distinct than for the square orifice, and still less when the height of the reservoir decreased. In the case of an orifice of a centimetre of an opening, the angles and jutting parts were scarcely perceptible, which shows that the greatest contraction tends to take place at a great distance from the orifice. This vein presented the appearance of a very thin liquid plate, which continually shrunk in its hori¬ zontal, but thickened in its vertical direction, indicating that the liquid masses belonging to the angles bordering the outline of the orifice, tend here naturally to reunite into one and the same mass. In order to explain this turning of the vein, they sup¬ pose that those particles which in the plane of the orifice form the centre of the vein, come principally from parts of the reservoir bordering the prolongation of the horizontal axis of this orifice, and describe paths sensibly parallel to this axis; while those particles belonging to the other parts of the orifice come from points of the reservoir as distant from this axis as they belong to points more remote from its centre; and hence the particles not only come into the plane of the orifice under inclinations greater and greater with respect to the axis of the vein, but they come in greater abundance. 392. The following table will show the contractions which a vein experienced at different distances from the plane of the orifice, the areas of the different sections being deduced by means of Simpson’s Method of Quadratures. The ori¬ fice was a square of twenty centimetres, under a charge of 1-68 met. It appears from the table, that the maximum of contraction of the section takes place at nearly thirty centi¬ metres’ distance from the orifice, or nearly F5 times the side of the orifice ; but beyond this distance the contraction continually diminishes, either because the vein dilates over its whole extent, or because its profile becomes more and more oblique with respect to the central thread. The amount of error does not exceed the 150th of the true value, and hence the maximum contraction may be taken equal to 0"437 of the area of the orifice, and the correspond¬ ing coefficient as 0‘563. This coefficient is sensibly equal 1 150 jxpen- to |M = (|)2 ; that is to say, that this section may be taken theMotion aS e(iuivalent to a square, the side of which is equal to fths of Fluids. tliat of' the orifice. HYDRODYNAMICS. Horizontal distance of section from plane of orifice in centimetres. 00 6-4 11-0 150 20-0 25-0 30'0 350 40-0 500 Surface of section in square centimetres. 400-00 252-05 245-12 237-46 233-01 23204 225-06 239-48 243- 62 244- 27 Absolute contraction of section in square centimetres. 0-00 147-95 154- 88 162-54 166- 99 167- 96 174-94 160-52 156-38 155- 73 Ratio of absolute contraction to area of orifice. 0-000 0-370 0-387 0-406 0-417 0-420 0-437 0-401 0-391 0-389 Coefficient of natural contraction, or ratio of section to orifice. 1-000 0-630 0-613 0-594 0-583 0-580 0-563 0-599 0-609 0-615 ^£3; In order to show the variation in the value of the coefficient for different charges and for different orifices, cuives were traced wherein the coefficients were regarded as ordinates, and the charges as abscissae of a curve con¬ structed for each orifice, and by its aid the ordinates were determined; that is, the coefficients intermediate to those directly determined by experiment. These curves followed, in general, a very regular motion, although distinct for each orifice; and their continuity was somewhat perfect, for they weie subjected to pass through points deduced from ex¬ periment. The nature of these curves was shown by Lesbros to be one of a parabolic kind,—the real wastes, however, instead of the coefficients, being substituted for the ordinates, and the charges as the abscissae. Les- bros found also the common and equilateral hyperbola on varying the quantities representing the ordinates and ab- Experl, scissae. I he curves relative to orifices of 20, 10, 5, and merits on 3 centim. always presented their concavity to the axis ofthe Motion abscissae, and had one ordinate a maximum; whereas for Fluids, those ol 2 and 1 centim. of an opening, the maximum point apparently disappeared. Some of the curves presented a very remarkable appearance, indicating a peculiarity in the law ol the coefficients for the orifices of 3 and 5 centim. Other curves, again, presented points of inflection, which were not seen in those of the orifices of 10 and 20 centim., showing again that the law of coefficients was different from those of 10 and 20 centim. of an orifice. The law, then, of the coefficients is peculiar when points of inflection enter the lines, for the degree of curvature necessarily increases with the numerous and sudden alterations of curvature. The curves also indefinitely approach the axis of abscissae, which will thus be an asymptote. 394. The interpretation of the curves contains the sub¬ stance of all the experiments, for they served to construct, by interpolation, a general table of the values of the coefficients, from formulae of the theoretical waste for charges over the orifices, increasing from the smallest charge of 0-0046 met. to the greatest of 3 met. 395. The following is an abstract from this general table of coefficients as drawn up by Poncelet and Lesbros. It will give one an idea of the labour and care which they bestowed upon the experiments. The coefficients were determined by the usual formula for the discharge (179), the data given being portions of the curves corresponding to the weaker and stronger charges in the reservoir; but those not thus obtained are separated from the others by a trans¬ verse line. The values of the quantities D and D' are the same as in 398 following:— Orifices shut at the upper part. Charges on the summit of orifices in metres. 0-0000 00046 0-0091 0-02 0-08 0-18 0-60 1-20 1-40 1-90 200 3-00 The height of the level of the water being measured From the orifice to a point where the fluid is perfectly stagnant. Coefficients of formula D, for heights of orifice of 20 cent.dO cent. 0-572 0-589 0-597 0-604 0-604 0-603 0-601 0-601 0-601 0-596 0-610 0-615 0-617 0-614 0-612 0-608 0-607 0-603 5 cent. 0-606 0-616 0-628 0-631 0-627 0-623 0-621 0-614 0-613 0-606 3 cent. 0-639 0-638 0-634 0-630 0-625 0-622 0-614 0-613 0-607 2 cent. 0-660 0-656 0-651 0-638 0-627 0-622 0-614 0-613 0-608 0-706 0-695 0-671 0-657 0-641 0-623 0-619 0-613 0-613 0-609 Coefficients of formula TV, for heights of orifice of 20 cent. 0-592 0-599 0-601 0-604 0-604 0-603 0-601 0-601 0-601 lOcent. 0-611 0-614 0-617 0-617 0-614 0-612 0-608 0-607 0-603 5 cent. 0-622 0-625 0-630 0-631 0-627 0-623 0-621 0-614 0-613 0-606 3 cent. 0-644 0-639 0-634 0-630 0-625 0-622 0-614 0-613 0-607 0-663 0-656 0-651 0-638 0-627 0-622 1 cent. 0-715 0-696 0-671 0-657 0-641 0-623 0-619 0-614 0-613 0-608 0-613 0-613 0-609 Immediately above the orifice. Coefficients of formula D, for heights of orifice of 0-615 0-594 0-594 0-598 0-604 0-604 0-603 0-601 0-601 0-601 396. It appears from the above table that the coefficients increase as the charges become greater, but only up to a certain point, for they then begin to diminish, although the charge he increased. In the general table it is seen that the coefficients approach an equality in each column as the charge increases. 397. Besides numerous experiments which they made on weirs, Poncelet and Lesbros endeavoured to determine the limiting case, or the point of natural transition between a closed and an open orifice ; that is, between a simple orifice and a weir. In one of their experiments on weirs, where the charge over the base of the orifice was 0-217 met., the con esponding coefficient was very near that for a simple orifice. But, in order to determine it experimentally, they lowered very gently the level of the water in the reservoir, beginning at the instant when the summit of the orifice was 0-660 0-708 0-618 0-614 0-616 0-617 0-614 0-612 0-608 0-607 0-603 0-638 0-634 0-631 0-627 0-623 0-621 0-614 0-613 0-606 3 cent, 0-769 0-665 0-643 0-635 0-630 0-625 0-622 0-614 0-613 0-607 0-839 0-690 0-660 0-651 0-638 0-627 0-622 0-614 0-613 0-608 0-978 0-719 0-674 0-658 0-641 0-623 0-619 0-613 0-613 0-609 entirely covered with water; they then opened the sluice of their canal a little more than was requisite, in order that the total quantity of water spent by this sluice and by the orifice, might be exactly equal to that which flowed into the reservoir. In this manner they easily determined the precise instant when the fluid was detached from the sum¬ mit of the orifice. The operation being repeated at various times, always gave a total charge of 0‘2205 met. over the base ol the orifice; when the charge exceeded this, the water ceased to adhere to the upper wall in a manner suf¬ ficiently stable to obtain accurately the waste. The charge of 0-217 met. over an orifice will thus correspond to the same instant when the adherence of the water to this wall is overcome, and when the orifice tends to form itself into a weir. 398. Before closing what we have to say on the experi- HYDRODYNAMICS. Experi¬ ments on the Motion of Fluids. merits of Poncelet and Lesbros, we append the following table, which contains several results of the experiments on an orifice 20 centim. of a base, and of various heights: we give it not only to show the care with which they con¬ ducted their labours, but also to exhibit at one view several of the tabulated results. We have selected two—the first and the last—from each of the six tables in the Experiences Hi/drauliques sur les lots de VEcoulement de UEau, &c. The headings over each of the columns refer to the follow¬ ing quantities :—l = 0*20 met. = horizontal length common to all the orifices; h = charge of fluid on the lower fixed border ; K that on the upper variable edge ; QJ = h-/i = the height of the orifice ; D = the theoretical waste, or volume escaped in a certain time relative to the velocity V; D =the theoretical waste on taking into account the in¬ fluence of the opening; E the actual waste as determined by observation, H = mean charge over centre of orifice = 1(4 +A')- degrees centig. 18*5 19*3 18-5 18*5 The height of the level of the water in the reservoir being measured From 3’50 met. above the orifice. O |1 ts !•< 3wU oK ? d 0) •-S .a 1-4720 0-1220 7'36 5-3738 214-952 0-61 1-5470 61-880 3 o 129-527 35-37^ |n 0-6026 0-5717 Mean value for each charge of coefficient. 0-6026 0-6028 0-5732 0-5928 Immediately above the orifice. 1-4718 0-1136 Sal®1 7-36 5-3734 0-57 1-4928 win s E a '3 o .2 ° £ 2 ~ 214-936 59-712 0-6026 0-5925 Mean value tor each charge of coefficient. 0-6026 0-5941 Definite values of coefficients on taking account of the va¬ riations that the temperature experiences at the height of the orifice, the charge of the fluid in the reservoir being measured— 0-6028 0-6186 From 3-50 met. above the orifice. Immediately above the orifice. (h'ifice 10 centimetres high, 20 centimetres wide. 17-0 19-0 1 17-0 13-8 11 1-5554 0-0630 15-55 5-5239 110-478 0-63 1-1117 22-234 67-568 0-6116 0-6111 0-61121 1-5553 13-191 0-5933 0-5926 0-61131 0-0525 15-55 0-53 5-5238 1-0148 110-476 20-296 0-6116 0-6499 0-6111 0-6112 0-6491 0-6622 0-6109 0-6110 0-6109 0-6110 0-5919 0-6106 0-6484 0-6615 Orifice 5 centimetres high, 20 centimetres wide. 17- 0 17-5 1 18- 0 24-0 26 1-6901 33-80 5-7581 57-581 35-596 0-6182 0-6175 0-6175 1-69006 33-80 5-7581 0-0363 0-73 0-8439 8-439 5-137 0-6087 0-6088 0-6225 0-0310 0-62 0-7798 57-581 0-6182 0-6175 0-6175 0-6168 7-798 0-6588 0-6589 0 6805 0-6093 0-6168 0-6168 0-6168 0-6230 0-6594 0-6810 Orifice 3 centimetres high, 20 centimetres wide. 17-2 20-0 1 19-0 19-7 17 1-3810 0-0201 46-03 0-67 5-2049 0-6280 31-229 3-768 19-469 I 0-6234 2-370 i 0-6290 0-6229 06262 0-6229 0-6433 1-38096 0-0128 46-03 0-43 5-2049 0-5011 31-229 3-007 0-6234 0-7882 0-6229 0-7847 0-6229 0-6224 0-6261 0-6224 0-6433 0-6224 0-7849 Orifice 2 centimetres high, 20 centimetres wide. 18-0 20-8 1 18-0 20-8 12 1-4002 0-0203 70-01 5-2411 20-964 13-033 1-02 0-6311 2-524 1-664 0-6217 0-6217 0 6217 1-4001 0-6593 0-6605 0-6676 0-0160 70-01 5-2409 0-80 0-56025 20-964 0-6217 0-6217 2-241 0-7425 0-7439 0-6217 0-7574 0-6216 0-6216 0-6216 0-6216 0-6604 0-6675 0-7438 0-7573 Orifice 1 centimetre high, 20 centimetres wide. 17-2 20-0 1 19-0 24-0 17 1-4020 140-20 5-2444 10-489 0 0174 1-74 0-5843 1-169 6-507 0-6204 0-6204 0-6204 1-40197 140-20 5-2444 0-814 0-6963 0-6955 0-6980 0-01461 1-46 0-5354 10-489 0-6204 0-6204 ! 0-6204 0-6189 0-6189 i 0-6189 0-6189 1-071 0-7600 0-7591 0-7630 06992 0-7017 0-7632 0-7671 399. The principal results from the experiments of Poncelet and Lesbros may be reduced to the following :— That with an orifice 20 centim. square, the coefficient is O'GOl under altitudes of T68 met. But when the altitude is reduced to 4 or 5 times the opening of the orifice, the coefficient is increased to 0’60o, then falls rapidly to 0,593 as the altitude decreases ; that with orifices of smaller dimensions, as a square of 10 or 5 centim., the coefficients observe the same law, being 0-611, O’GIS, and O’Gl 1 for the first, and 0-618, 0*631, and 0-623 for the second ; for orifices of lesser dimensions, the coefficients rose gradually to 0‘698. In the case of weirs, the mean coefficient was 0-400. 4. Miscellaneous experiments of—(a.) Savart, (j3.) Eorda, (•y.) Bidone. 400. (a.) M. Savart, in his book De la Constitution des Veines Liquides lances par des Orifices Circulaires en mince Paroi, 1833, gives some curious information on drops relative to fluid veins. We have already seen that, when a fluid issues by an orifice from the bottom of a vessel, a vein is produced. Now this vein is not, as might be supposed, a uniform cylindrical mass of fluid; it is nearly a solid cylin¬ der between the orifice and the contracted section, but at a small distance beyond this section, a series of successive swellings and shrinkings take place, which are nicely seen by a strong light; and at last the swellings end in drops and detached masses. Savart observed that these drops were alternately big and little, that between each drop there was a space eight or ten times their mean diameter, and their form oscillated betwixt a prolate and an oblate sphe¬ roid. He found that the clear, limpid, untroubled part of the vein, as well as the swellings of the troubled part, were proportional to the diameter of the orifice and to the charge. With respect to the drops which become detached from the troubled part, their formation is not, as in descending jets, an effect of acceleration due to gravity; for the drops are detached in the same manner from a vein when it is directed upward. Savart attributed the effect to an oscil¬ lation in the fluid of the reservoir, whereby the molecules of the fluid, being pressed sometimes more or less in issu¬ ing from the orifice, moved with a velocity more or less great. These movements may be seen very nicely in ex¬ periments on the resistance that the air experiences in pipes: the air may then be seen advancing irregularly as if by un¬ dulations ; the waves, on propagating themselves, accelerate and retard the velocity. 401. M. Savart, moreover, found that the waves or un¬ dulations of the atmosphere had a very singular effect on the fluid vein. When the troubled part of the vein is re¬ ceived on the bottom of a vessel, the sound arising from the shocks of the successive drops can easily be heard; and if this sound be in unison with a musical instrument sounding at a small distance from the vein, immediately the clear, untroubled part of the jet shortens, and sometimes disap¬ pears ; the swellings of the troubled part increase, shorten, and the space separating them is greater also. These vibrations of the atmosphere have considerable influence on a descending jet, but less effect on an ascend¬ ing one; for in the latter case the transverse section in¬ creases instead of diminishes in proportion as it recedes from the contracted section, which is never so small that the effect of these vibrations may become sensible. 402. Besides these peculiarities connected with a fluid vein, Savart investigated the action of a jet against an immovable plane, and also of two directly opposing jets. When a jet is directed against a vertical plane surface, the 151 Experi¬ ments on the Motion of Fluids. 152 HYDRODYNAMICS. Expen- surface receiving the jet must he considerably larger than the^Iotion the ma8nitude of tlle orifice. Were it less than this, then of Fluids. evidently t,ie water would turn over the edges of the plane ; v , hut that this be not the case, the area of the plane surface must be about eight times that of the orifice. It will now be seen that the liquid threads from the vein will spread out in all directions on the surface till they be parallel to it. As soon as they have attained their parallelism, the pressure of the jet against the plane is at a maximum, and can easily be measured. If the plane be oblique upward, the water will spread it¬ self moie on the upper part than on the lower c the jet also does not press with so much intensity on the plate as in the last case. When two equally powerful and equally broad jets directly meet each other, so that both will form a straight line, the water at the section of opposition forms a most beautiful tianspaient disc, which is surrounded by a circular rim, having watery spikes radiating from it in all directions. 403. (/?.) Borda completely realized the case when a pipe with thin sides and entirely penetrating the wall of a reser¬ voir, is employed for the purposes of discharge. Having taken a white-iron tube, 0-135 met. long, and 0-032 in dia¬ meter, and wholly placed within the reservoir, he produced, under a charge of 0-25 met., a fluid vein which was alto¬ gether detached from the walls of the tube, and the actual was only O'olo of the theoretic waste. Various considera¬ tions led Borda to think that it might even be reduced to 0-50, or one-half of the theoretical discharge.1 404. (y.) George Bidone of Experiences sur la Forme et la Direction des Veines et Conrans d'Eau lances par diverses Ouvertures, 1829, gives us something very in¬ teresting on the phenomena of a fluid vein. Among his numerous experiments, he took a regular pentagonal orifice 0-014 met. in the side, pierced in a thin vertical copper¬ plate : the escape took place under a charge of 1-97 met. At a distance of 0"012 met. from the orifice, the transverse sec¬ tion, perpendicular to the axis of the vein, was a very regular decagon. The greatest contracted section, or first shrink¬ ing, was distant from the orifice by 0-030 met. Beyond this, however, the vein entirely changed its form ; it pre¬ sented, at a distance of 0-095 met. from the orifice, a system of five fluid radial blades, or spokes, symmetrically disposed around the axis of the vein ; the breadth of these spokes in¬ creased up to the swelling of the vein, then it diminished, and the spokes reunited anew so as to form a second shrink- ing at a distance of 0"86 met. Beyond this the vein con¬ tinued round but shapeless. Besides a rectilineal pentagon, he successively substituted orifices which were regular pentagons, but in a convex and a. concave disc, and also with salient and re-entrant angles like a star with five radiations, and the vein preserved^al- ways the same form, together with the same five radial blades or spokes. When the orifice had 6 and 8 sides, the number of blades was 6 and 8 ; and the turning or inversion (389) of the vein was a 12th and a 16th of the circumference. When the opening was a narrow rectangle, but prolonged hori¬ zontally, at a certain distance the vein had no longer a bioad vertical blade,—the turning appeared complete. 405. V\ ith respect to the phenomena of the troubled part of the vein, we see sometimes, beyond the second shrinking, the vein dilating itself anew, and dividing itself a second time into the same number of blades. These ) ades increase in breadth up to a second swelling, and then diminish so as to form a third shrinking, beyond which a third dilatation ensues, or a third swelling is formed, then a fourth shrinking. Eytelwein, in his German trans¬ lation of Michelotti s Spenmenti Idraulici, gives a descrip¬ tion and representation of the different forms of these swellings and shrinkings. 406. The main cause of the forms and turnings of veins is the oblique direction which the fluid fillets take on ap¬ proaching the orifice, and this direction tends to urge them beyond the orifice. The action of these fillets on the forms of the veins is greater when the fluid issues out of a very acute angular opening; the latter opening compresses the vein more strongly than do other orifices, and hence the blades form at parts intermediate to those where they ex¬ ercise their action. Lastly, the resistance of the air, and the mutual attraction of the particles, contribute to contract the blades, and to form a second shrinking. 407. Bidone, also, by numerous experiments at the Water-works of Turin, endeavoured to solve the question of augmented waste when the contracted vein was sup¬ pressed on one side. This suppression has been noticed already in 171. The following table gives the result of experiments to determine this point:— Expert- raents on the Motion of Fluids, The contraction heing suppressed on No side One small side One large side One large and one small side Two small and one large side Two large and one small side Portion of orifice without contrac¬ tion. 0 Coefficient. Ratio of increase. 0'608 0-620 0-637 0-659 0-680 0-692 1-000 1-020 1 049 1-085 1-119 1-139 The figure of the orifice was confined to the rec¬ tangular form, the base of which was 0-054 met., and height 0-027. The plates, which were attached some¬ times on one side, sometimes on another, and some¬ times on two or three of the sides, were 0-067 met. long ; that is, they advanced thus much into the reservoir. 1 he flow took place under charges of from 2 to 6*88 met. I he coefficients are noted in the table, wherein the last column indicates that unity has been taken a-6-0 ^ie. or*dce *s entirely free; as the column of co¬ efficients increase, so also it appears that a corresponding increase takes place in the discharge column. M. Bidone has deduced from his results the general expression 1 +0-152 x—, in which n is the length of the part of the perimeter where the contraction is suppressed, and p the whole perimeter of the orifice. Since this expression gives as its maximum error a 39th part only, the formula repre¬ senting the waste by a rectangular orifice, when one part of the contraction is suppressed, will be represented by Q = ^S^/2^H x ^1+0-152 x-\ 408. Bidone made also experiments on circular orifices, one of which was 0"04 met. in dia¬ meter; and, by the aid of plates curved cylindrically, first 1 - eighth of the contracted perimeter was de¬ stroyed, then, successively, 2, 3, 4, 5, 6, and 7 eighths. The annexed table shows the results obtained. By it we see that the numbers of the last co¬ lumn increase less rapidly than in the case of rectangular orifices, and the general expression is now only Coeffi¬ cient. 0-597 0-603 0-615 0.625 0-639 0-649 0-664 0-670 Ratio of increase. 1-000 1-011 1-032 1-048 1-072 1-087 1-112 1-123 1+0T28X-. p 409. After having destroyed 7-eighths of the contracted section, Bidone, to destroy it entirely, introduced within 1 Memoires de VAcademie des Sciences de Paris, 1766. HYDRODYNAMICS. 153 Experi- the reservoir 0'067 met. of cylindrical pipe, 0-04 met. in dia¬ ments on meter. The coefficient which he now obtained was the Motion o-767, and 1-285 for the ratio of increase. From the ex- of Fluids. pressjon mentioned above, this number would be 1T28, where the augmentation is not one-half that really obtained. He concluded, therefore, that the phenomena of interior additional tubes, in the case where the contracted section is wholly suppressed at the exterior edges of the orifice, is not of the same nature as when the contraction is only de¬ stroyed in part, however great that part may be: there is no intermediate case between them.1 M. Bidone experimented also on Weirs; and the remarks which he made on this subject were among the first worthy of notice. See his Experiences sur la Depense des Rever- soirs, 1824. 5. Experiments of Mr George Rennie. 410. Mr Rennie, in the year 1830, experimented on the waste by orifices and tubes of different diameters and lengths, and at different altitudes. The area, length, and altitude were the three main elements that entered into these experiments. The apparatus consisted of a wooden cistern 2 feet square in the base, and 4£d feet high. The water was maintained at a constant height by means of a regulating cock; a float with an index indicated the exact height at which the water stood in the cistern above the centre of the orifice. The orifices were in brass discs, about a 60th of an inch thick; the discs were fitted into a hole in the wall of the cistern, and closed by a valve of brass, ground truly to each of the plates. A lever opened the valve, and a chronometer noted the time. The fol¬ lowing table contains the wastes from different-sized ori¬ fices, the vessel being kept constantly full, and at different heights:— Circular orifice in brass plate 1 inch diameter, -^Gth inch thick. Height or charge over centre of ori¬ fice. Feet. 4 3 2 1 Real time in dis¬ charging one cubic foot. Seconds. 19-5 210 26-0 360 Theoreti¬ cal time in discharg¬ ing one cu¬ bic foot. Seconds. 11-4 13-2 16-1 22'8 Ratio of theo¬ retical to real waste. 1:0-584 1 :0-628 1 :0-619 1:0-633 Vena contracta. Not accurately mea¬ sured. Circular orifice in brass plate 0-75 inch diameter, -J^th inch thick. 33 37 44 63 20-3 23-4 28-7 40-6 1 :0-614 1 :0-632 1:0-652 1:0-644 AtT65th inch from orifice the diame¬ ter contracted to 0-685. Circular orifice in brass plate 0-5 inch diameter, ^th inch thick. 73 83 104 144 45-7 52-8 64-6 91-4 1:0-626 1:0-636 1 :0-621 1:0-634 At 0-5 inch beyond orifice the diameter contracted to 0-37 inch. Circular orifice in brass plate 0-25 inch diameter, -J^th inch thick. 276 320 396 545 182-9 211-3 258-6 365-7 1:0-662 1 :0-660 1 :0-653 1:0-671 At 0-25 inch beyond orifice, the diameter contracted to ^ inch less than the orifice. Experiments on the Wastes from rectangular and triangular orifices in brass plates, £vth inch thick, and of equal areas, from a vessel kept constantly full, and at different heights. Equilateral triangular orifice 1 inch, apex uppermost. Charge over centre of orifice. Time in discharg ing 1 cubic foot. Theoreti¬ cal time in dis¬ charging 1 cubic foot. Ratio of real to theoretical discharge. Form of orifice. Feet. 4 3 2 1 Seconds. 15 18 22 30 Seconds. 8-9 10-3 12-7 17-9 1:0-593 1:0-572 1:0-577 1: 0-596 Vena contracta about i inch beyond ori¬ fice ; but the jet with angles re¬ versed, and taking the sides of the triangle, the jet then expanded and lost its form. Equilateral triangular orifice as before, apex downwards. 15 8-9 1:0-593 Vena contracta same as before, but the jet having its angle upwards, being the reverse of the former experiments. Rectangular orifice 1 inch square. 15 17 20 29 8-9 10-3 12-7 17-9 1: 0-593 1:0-606 1: 0-635 1:0-617 Vena contracta 0-75 inch beyond orifice, when each angle of the jet took the place of a side, and dissipated its spray. Rectangular orifice 2 inches by i inch, long side horizontal. 15 17 20 29 8-9 10-3 12-7 17-9 : 0-593 : 0-606 : 0-635 : 0-617 Vena contracta as be¬ fore ; each angle of the jet took the place of a side. Rectangular orifice 1-5 inch by 0*625 inch, placed as before. 15 17 19 27 8-9 10-3 12-7 17-9 1:0-593 1 :0-606 1:0-668 1:0-663 Vena contracta as be¬ fore ; and figure as in that immediately above. From the above table it appears that, with equal areas, the waste by different orifices, whether circular, triangular, or rectangular, is nearly the same, the increase being with rectangular orifices. 411. The next table contains the waste by cylindrical glass orifices and tubes, from 1 inch to 1 foot in length, and of different diameters, from a vessel kept constantly full, and at different heights. It appears—ls£, That the wastes in equal times from ori¬ fices and additional tubes, are as the areas of the orifices; 2d, That the wastes in equal times by the same additional tubes and orifices, under different heads, are nearly as the square roots of the corresponding heights; 3d, That the wastes in equal times by different additional tubes and ori- Experi- ments on theMotion of Fluids. VOL. XII 1 Recherches Experimentales et Theoriques sur les Contractions Partielles des Veines d'Eau, etc., 1836. U 154 HYDRODYNAMICS. Experi¬ ments on the Motion of Fluids. fices, under different heights, are to each other in the com¬ pound ratio of the areas of the apertures, and of the square roots of the heights. Constant charge over orifice. Feet. 4 3 2 1 Time in discharging 1 cubic foot. 1 inch. 0'75 inch. 0*5 inch. 0-25 inch Seconds. 11-5 150 17-5 25'0 Seconds. 24-5 28-5 350 53-0 Seconds. 55 63 77 110 Seconds. 145 157 205 297 Glass tubes 1 foot long. 14-0 17-0 21-5 30-0 30 33 40 58 63 73 88 130 200 227 283 410 412. From the preceding experiments, the mean coeffi¬ cient for Altitudes of 4 feet with circular orifices is 0-621 But with altitudes of 1 foot, the coefficient is 0,645 With triangular orifices at 4 feet altitude 0'593 1 foot 0-596 With rectangular orifices at 4 feet 0-593 1 foot 0-616 413. Mr Rennie has also made experiments on the volume discharged by leaden pipes of different diameters and lengths, from a vessel kept constantly full, and at different altitudes. The time in discharging 1 cubic foot is nearly double the time occupied by glass tubes of equal lengths and areas. Straight pipes 15 feet long. Constant height over centre of pipe. Feet. 4 3 2 1 Time in discharging 1 cubic foot. 1 inch. | inch. h inch. Seconds. 28 33 41-25 61-25 Seconds. 54 63 79 117 Seconds. 143 164 208 312 The following table shows the wastes from leaden pipes 0*5 inch of bore, the lengths varying from 1 foot to 30 feet:— Glass tubes 1 inch long, 0-5 inch in diameter. Feet. 4 3 2 1 Sec. 55 63 77 110 Brass bore,-5 in. in diam. Sec. 73 83 104 144 1 foot long. Sec. 55 63 93 133 3| feet i g. Sec. 78 92 113 170 71 feet long. Sec. 102 120 151 226 111 feet long. Sec. 122 145 184 278 15 feet long. Sec. 143 164 208 312 30 feet long 203 240 303 450 The ratio of the waste by glass tubes with pipes 30 feet long is as 1:4) , And with brass orifices, is as 1 : 3) neai Hence the expenditure of water through pipes of equal diameters, but different in length, and under different alti¬ tudes, will be as follows :— The length being as 30 :1, the wastes are as 3-7:1 8:1, 2-6:1 4:1, 2-0:1 2:1, 1-4:1 The wastes by leaden and glass tubes are nearly the same. The length of a pipe may be increased from 3 to 4 feet, without diminishing the discharge, as compared with the plate orifices. 414. 1 he experiments on leaden pipes in order to show the effect of bends, are very interesting. Mr Rennie took the straight pipe, ’5 inch of bore, on which the former ex^ periments were made, and carefully bent it into one, two, and fourteen semicircular bends respectively, each bend being 7‘5 inches in the semi¬ diameter, and two of the fourth part of a circle of 3'25 inches radius. The results are shown in the annexed table. This table shows us that, with one semicircular and two quadrantal bends, when com¬ pared with a straight pipe of equal length and bore, the re¬ sistance is greater than that of the straight pipe by a 36th to a 70th of the latter. With fourteen semicircular and two ^th circle bends, the increased resistance varies from a 19th to a 39th of that of the straight pipe. The increased number of bends also does not in¬ crease the resistance in the ratio of the number of the Pipe 15 feet long, -5 incli bore, with 1 semicircular and two £th circle bends. Constant height over centre of orifice. Feet. 4 3 2 1 Time for 1 cubic foot from pipe with 3 bends. Sec. 147 175 213 316 Time for 1 cubic foot from straight pipe. Sec. 143 164 208 312 Pipe 15 feet long,-5 inch bore, with 14 semicircular and two ith circle bends. 162 200 247 351 143 164 208 312 Experi¬ ments on the Motion of Fluids. bends, but only shows an increase of resistance, as com¬ pared with the four bends, of a 15th to a 35th. 415. In the case, again, where the bends are rectangu¬ lar, the same dimensions of a pipe were employed, and the bends were in the form of right-angled elbows, each side being 6‘75 inches long. The number of elbows varied from 1 to 24. The experiments in the following table show us that in the first three the waste diminishes as 2*5 : 1 ; and in the last, as 3: 1 nearly. The whole number, however, indicate that with one right-angled pipe the waste differs only from that given by a pipe with twenty-four right angles, as 2:1, however natural it might be to infer that the diminu¬ tion of waste would be greater as the number of right angles increased:— Height over the centre of orifice. 1 right angle 8-5 in. from end of pipe. Straight pipe 15 feet long. 24 right angles. Feet. 4 3 2 1 Secon ds. 180 214 246 371 Seconds. 143 164 208 312 Seconds. 395 465 584 872 6. Professor Magnus's Experiments. 416. In the year 1848, Professor Magnus of Berlin com¬ municated to the Royal Academy of that city the results of his experiments on the motion of fluids. He was led to the subject by doubting the truth of an inference at which Venturi had arrived in one of his experiments relative to the lateral communication of fluids. The two main proofs in support of Venturi’s opinion are those already mentioned in 262 ; and, as a consequence of the first experiment, he asserts that if any very mobile body—a light feather for ex¬ ample—be brought near a jet of water spouting in the at¬ mosphere, the jet will impart a motion to it, and the body will be carried forward by the air. Professor Magnus ap¬ plied to such a jet as delicate a test as he could conceive: he held the flame of a candle to the transparent portion of the vein, but was unable to detect the slightest motion. But on applying it to the second or third of the swellings of the vein, the flame became slightly disturbed ; and at that part where the jet is broken up into detached masses it was violently agitated, and at last put out by the spray. This was the case when the jet was regular and steady; but if it oscillated under the vibrations of the air, then the flame was carried forward at an anterior part of the jet. Now it is clear that, if the air were, in consequence of its HYDRODYNAMICS. 155 Experi- adhering to the jet, carried along by the water, this action ments on must be strongest where the velocity of the fluid particles is the Motion greatest, that is, near the vena contracta. But as this is of Fluids. not ^ cage> ag t]ie flame begins to oscillate only at the time when the jet begins to be unsteady, it is very probable that if this motion in the jet were to cease, the irregularity in the flame would also vanish. 417. The other experiment of Venturi, mentioned in 262, was ingeniously modified by Professor Feilitzsch (Poggen- dorff’s Annalen, vol. Ixiii., p. 216). He took a rectan¬ gular vessel EDGF, divided into two parts by a partition HI. A cylin- ^ drical pipe ABC, 2'o inches in dia¬ meter, and 8 in- K dies long, with both ends open, and close to the bottom EF, was a means of com- Fig. 68. municating with both divisions. The supply pipe, about 6 feet long, is, by hb, bent horizontally at b, and having in this extremity a jet tube ab, which spouts within ABC near BC. Suppose, then, the water to be at the same level in both divisions of DF, say to the opening K, and let the jet begin to work into the pipe ABC, then the level of the water in the part FGHI begins to sink. 418. It was while repeating this experiment that Pro¬ fessor Magnus observed the water in GI lowering to the pipe ABC, and air was found to enter that pipe along with the stream. Since this was the case, it occurred to him, that a jet projected horizontally with considerable velocity against the orifice of a vessel full of water, would prevent that water from flowing out. In order to show this, he had a reservoir kept con¬ stantly full, from the bottom of which a right-angular tube ghf, proceeded, gh being 7 feet long; the hori¬ zontal jet entered a tube de, communicat¬ ing with the vessel A, 8 inches wide and 10 high. The tube de did not exceed 6 inches, / was distant from c by 6 inches, and the diameters of /and e were as 1:4. Under such conditions, the jet from/ raised the surface of A to a height of 10 inches, without a single drop escaping from e; but when e had its diameter increased, a small portion of water flowed out from e ere the above height was attained. During the experiment a violent foaming took place within the tube de, which caused a vibratory motion in A. He modified the above experiment by making the orifice of the vessel in the bottom, and projecting the jet verti¬ cally upwards, the diameters of tube and orifice being as 1 : 2. This diminution of the orifice was necessary from the fact, that the motion of the fluid exerts here a more disturb¬ ing influence than in the experiment with the horizontal tube. 419. After performing M. Savart’s experiments of jets impinging on fixed planes, and against each other, the jet was di¬ rected against the in¬ terior surface of a hol¬ low hemisphere of 24 mill, diameter. The jet issued from an orifice 3 mill, in diameter, and under a pressure of 2"3 met.; the hemisphere was at right angles to f’is-70- the jet, and at a distance from the orifice of 0-o met. The water, on leaving the hemisphere, directs itself to a point Experi- in the jet, but here it meets the coming stream, and so ments on causes a peculiar foaming and streaming of the water, as ^Motion represented in fig. 70. . i _ i When the jet wasdirected against the same hemisphere, ob- liquely situated with respect to the hori¬ zon, then the re¬ flected water seeks to unite at a point be¬ low the line of jet, forming a figure si¬ milar to the preced¬ ing. The meeting point of the reflected Fig.71. water would be at a point above the jet were the hemi¬ sphere turned the other way. 420. These last two experiments are very important in the case where a jet, as we have seen, projected against an orifice prevents a flow from taking place ; for the whole of the reflected water converges to a point in the jet, and, thus arrested, it must be thrown back so as to form a new sur¬ face. Hence, also, we can understand how a small jet can keep back a flow from a wide orifice, and also how a large surface cannot be formed, for it is broken up into a great number of little masses constituting foam. 421. In order to show this very clearly, Professor Magnus modified the experiment, by fixing on the horizontal tube de, fig. 72, a vertical part nm, the whole appearing like a T reversed (jJ. The experiment was so arranged that k, the point where the jet met the water from A, lay between d and m; water Fig. 72. was then poured in by the tube nm, but none of it escaped by e, for the whole was driven into A. The point k evi¬ dently depends on the pressure of A when / is constant; hence an increase of pressure throws k nearer to e. He next inserted tightly a tube on n, passing under one side of the jet into a large empty bottle having a double head; a bent tube passed from the other head of this bottle into a jar, the open end of the former dipping into a coloured liquid or mercury. On the jet being set a-working, its action drew out the air from the new tubes by nm, and accordingly the coloured fluid or mercury rose from its vessel. 422. When the jet meets the water in de, a foaming takes place, and the air inclosed in the foam enters the ves¬ sel A. That this is the case may very easily be seen when A is a glass vessel; bubbles of air will then stream up to the surface-opening of A. Savart had previously noticed this same thing, but thought it of no consequence ; Prof. Magnus, on the contrary, thinks it highly important. Al¬ most every individual has noticed, of a morning, bubbles of air clinging to the sides of the tumbler ; how have these obtained entrance ? Prof. Magnus thinks he can account for it, and the explanation of it brings him a second time to refute Venturi’s assertion that light bodies are carried along with the jet. For if this were the case, then air would en¬ ter the vessel A by the friction of the air and jet; but this is impossible, for the air cannot be put in circulation by a jet spouting perpendicularly from a vessel by a long tube, its mouth being distant from the surface of the water im¬ pinged on by 1 mill., as was shown by Prof. Magnus. But the phenomenon appears to be caused in the follow¬ ing manner : When a jet strikes the water a hollow is im¬ mediately formed on the surface ; this closes in very quickly, as soon as the least motion is imparted to the surface, and 156 Experi- while closing up, so much air is carried downwards. When the jet is continuous, these hollows, which are distinctly of Fluids? yhsible, are so speedily formed and so quickly closed up, that v ; h is almost impossible to detect how the air gets introduced. Prof. Magnus, however, found that when a jet falls on a tranquil surface placed at a small distance from the orifice, and before it has attained its greatest contraction, a consi¬ derable concavity may be seen around the jet without any air entering ; let the surface now be slightly disturbed by a few drops falling upon it from a height of a few inches, and at a small distance from the jet. The drops do not of themselves carry any air downwards; but W’henever they meet the suiface, a peculiar sound proceeds from the part of the surface impinged on by the jet, and at the same in¬ stant air-bubbles form which carry air downwards. 423. I rof. Magnus now directed his attention to the HYDRODYNAMICS. action which a jet has on a body placed in a fluid, or to Experi- etermine experimentally if the resistance varies with the ments on distance from the orifice. In order to render the results asthe Motion complete as possible, experiments w ere first made in air, to of ascertain how far it is necessary that the plates used should be flat; and to render the results independent of the gra¬ vity of the water, a horizontal stream was applied. The re¬ sistance was in each instance measured by a kind of balance to which the plate was attached. Smooth flat plates and hollow hemispheres were preferred. The diameter of the plates varied from 100 to 200 mill. The plates were placed in a vessel of water, first vertically at a certain distance from the orifice of a horizontal jet, and second, horizontally or parallel with the surface, and subject to a vertical jet. The tables, as under, will show the results of the several expe¬ riments. 1 HORIZONTAL JET. Orifice. In thin plate, dia¬ meter 3 mill. In thin plate, dia¬ meter 3 mill. In brass 1 mill, thick, diameter 3 mill. Small glass tube, 10 mill, long, diameter 3 mill, nearly. Small glass tube 20 mill, long, diameter a little under 3 mill. a ^ .5 2145 2145 100 150 2-229 2-229 2-229 P o Sla Weight in grammes necessary to bring the plate to its place. 20 50 100 150 200 No. l. 20-0 210 21-5 21-5 21- No. 2. 20-0 21-0 21-5 21-5 20-5 200 20 50 100 150 200 250 300 No. 4. 20 50 100 150 200 250 150 150 20-0 21-0 22-0 230 23-0 230 22-5 No. 5. 20-0 21-0 22- 5 23- 5 23-5 23-0 22-5 No. 3. 200 20- 75 21- 5 21-5 20-5 No. 6. 18-0 190 20-0 20-0 210 210 20-5 No. 7. 16-0 16- 7 18-0 18-0 18-0 17- 5 No. 8. 16-2 16- 7 18-0 18-0 18-0 17- 7 20 50 100 150 200 250 20 50 100 150 200 No. 9. 21-0 21-6 23-2 23-3 23-3 23-2 No. 10. 14-3 14- 9 15- 2 15-4 15-2 VERTICAL JET. Orifice. In thin plate, dia¬ meter 3 mill. The same. The jet made an angle of 10° with the verti¬ cal. Glass tube 10 mill, long, diameter nearly 3 mill. Glass tube 65 mill, long, 6 mill, dia¬ meter ; smelted at the lower end to a width of 3 mill, nearly. Glass tube 65 mill, long, hav¬ ing everywhere a diameter of 3-3 mill. 2-772 200 I a 5s o « £1 |ad 5la 2-772 2-772 200 200 2-772 2-772 200 200 50 100 150 200 50 100 150 200 20 30 50 100 150 200 20 50 100 150 200 20 50 100 150 200 Weight in gram¬ mes necessary to bring the plate to its place. No. 11. 29- 5 30- 5 310 30-5 No. 12. 29- 0 30- 5 31- 0 30-5 No. 13. 290 30- 7 31- 0 30-5 No. 14. 26-0 26- 5 27- 5 28- 5 29- 0 28-5 No. 15. 23-5 25- 5 26- 5 26-5 26-0 No. 16. 28- 5 29- 5 30- 8 31- 3 30-9 424. In determining the above results, it was found that, the distance from the orifice remaining constant, the force lequisite to produce an equilibrium increased with the mag¬ nitude of the plate up to a certain limit, beyond which the force was constant. In the case of the horizontal jet, the pressure on the plate, up to a length of 150 mill., increased with the distance from the orifice. None of the experi¬ ments showed a decrease within the distance of 100 mill. But the increase was not always equal, and this was owing to the imperfect nature of the apparatus. HYDRODYNAMICS. 157 Experi- A similar increase was shown in the case of the vertical mfints on jet, both when it struck the centre of the plate vertically, the Motion an(j when at an angle of 10°. of Fluids. 425. The last thing that Prof. Magnus endeavoured to resolve in these experiments, was the important one of how a jet of water mixes with the water of a vessel into which it is projected. He first of all introduced into a large tank, nearly full of water, various bodies, as Semen lycopodii and milk ; but on the jet playing into the vessel, the motion of the fluid was unsteady and violent, so that nothing could be determined. A very curious phenomenon, however, was observed ; no sooner had the jet begun to play in the vessel, at a distance of 2 inches under the surface, than the fluid surface immediately over the jet was more or less depressed, according to the greater or less power of the jet. Sometimes the surface was a little above, sometimes a little below the jet; at the jet the surface was very uneven and wavy. The backward and forward motion of the water under the action of the jet, showed that a considerable portion of the motion¬ less water must be carried forward by the jet; this causes a whirling motion in the water, which, owing to its opacity, prevents the nature of the action from being known. The next process which he adopted so as to arrive at a knowledge of what he wanted, was to cause water, free from salt and hydrochloric acid, to spout into a vessel contain¬ ing water, into which was dissolved about 1 per cent, of salt. The exact amount of salt in the mass was accu¬ rately determined by a solution of nitrate of silver. In order then to take water from the jet streaming into and below the surface of this solution, he took a long bent tube such that one extremity was in the water and opposite the jet, while the other extremity rose above the surface of water, and emptied into a tumbler any water that flowed through it. If now a jet spout into the vessel, and one extremity of the bent tube be applied at certain distances from, and in opposition to the jet, so much fluid will enter the tube and pass into the tumbler; by the proper test the amount of salt in the tumbler may easily be detected. When the distance between the tube and the orifice of the jet was considerable, the fluid received by the tube into the tum¬ bler was the same as that in the vessel. Three separate portions were taken in the glass and examined, and when the second and third were of the same composition, the re¬ sult was considered as correct. As the jet continued to spout in, the water in the vessel was more and more diluted, but before each experiment the fluid was always tested. It was of the utmost importance to know whether the salt solution penetrated the middle of the flowing jet; and to this end the tube was accurately fixed in direction with the jet while the vessel was empty. The following table will show the results of the several experiments. The Tube Point in the middle of the Jet. Number of expe¬ riments 1 2 3 4 5 6 7 8 9 10 11 12 Diamet. of orifice through which water entered, in mill. u 0.2 10 20 20 10 20 20 30 30 30 30 30 50 Quantity of salt con¬ tained in vessel be¬ fore expe¬ riment. per cent. 0-92 0-90 0-78 0-89 093 0-98 0-93 0-90 0-88 0-82 0'99 0-98 Quantity of salt in fluid ob¬ tained through tube. per cent. 0-50 0-54 0-46 0-03 0-14 0'16 0-27 0'27 0-23 0-19 0-22 0-44 The fluid obtained through tube con¬ sisted of Salt solution. per cent. 54-4 60-0 59-0 3-4 15- 1 16- 4 290 30-0 26-2 23'2 22-0 dl-Q Water, per cent. 45-6 40- 0 41- 0 96-6 84-9 83-6 710 70-0 73-8 76-8 78 0 55-1 When the point of the tube was brought close up to the orifice, the pure water of the jet flowed by the tube into the tumbler, and the test showed not the smallest trace of salt. The results, however, were different when the tube point was slightly inclined to the direction ot the jet. These results are shown in the following table:— Experi¬ ments on the Motion of Fluids. The Tube Point inclined to the Jet. 2 s S'C 3 © ° S g lii s 10 10 10 20 20 20 30 30 30 The tube was situate In the middle. l°-75 sidewards. S0' sidewards. In the middle. l°-75 sidewards. 2°-5 sidewards. In the middle. l°'7o sidewards. 2°'5 sidewards. Quantity of salt in vessel be¬ fore expe¬ riment. per cent. 0-89 1-08 0-94 0-98 1-06 0-99 0-99 0-97 Quantity of salt re¬ ceived through tube. per cent. 003 0-23 0-42 0-16 0-40 0-45 0-22 The fluid obtained through tube con¬ sisted of 45-5 Water. per cent. 96-6 78-7 55-3 83-6 62-3 54-5 78-0 K9.fi This table lets us see that the amount of salt in the drawn off fluid, increases considerably as the deviation from the direction of the jet increases. 426. In order to explain the preceding phenomena, sup¬ pose that a jet enters an indefinite mass of fluid, by an ori¬ fice at a depth below the fluid surface, then the velocity of the jet will decrease as its distance from the orifice in¬ creases, and its dimensions will also increase. Take the volume which will enter the mass in a unit of time; then this volume expands in a direction perpendicular to the axis of the jet, and its dimension in the direction of the jet must diminish. If the velocity decrease in such a manner, that both velocity and thickness are inversely as the cross section during the same time, then the same mass will pass through all planes perpendicular to the axis of the jet in the same space of time; but, in such a case, the force im¬ parting motion to the water must decrease as the velocity decreases. The moving force, however, cannot be de¬ stroyed, since the resistance to motion from the sides of the indefinite fluid mass is nothing, and the surface is supposed to continue horizontal. The jet, doubtless, is resisted by the particles of the indefinite mass, but since that is due to the inertia of the mobile particles, the moving force in the direction of the jet is unaltered ; and hence, as soon as the motion has attained a degree of permanency, the same amount of force is exerted during the unit of time in all planes perpendicular to the axis of the jet. If, when the jet widened, the volume underwent a change of shape, such that its cross section became greater while the velocity remained unchanged, the time occupied by the mass in passing through the different cross sections would be less and less as the width increased. Were this the case, the different layers of the jet must either separate, or their density must change. If care be taken that the same mass alone expands, and no addition be made to it, then a de¬ crease of pressure, without a change of density taking place, will be the result. But again, since the mass moves in a fluid of the same kind, an increase of volume will take place from the lateral communication of the jet and surrounding fluid. This increase of mass diminishes the velocity; but the moving force being constant, a greater volume of fluid will pass through a distant section in a certain time, than through one nearer the orifice. We shall see presently that the pressure of a moving fluid is less than if it were still; and therefore to say that no portion of the moving force is lost when the jet is in action might seem somewhat inconsistent, since part of this force 158 HYDRODYNAMICS. Experi- would seem necessary to balance the difference of pressure ments on in liquids. But there is no inconsistency in this, for the tIlf pIo^on diminution of pressure is caused by the forward portions of ° U1 3‘ the fluid passing through a cross section of the jet quicker / than those which follow. If, then, the difference of pres¬ sure lessens the velocity of the original mass, it also sets the fluid at each side in motion, and in this way is the loss of force compensated. The consequences which follow from the above are,— 1. That a jet streaming into a fluid, similar to itself, sends more water, in the same time, through across section situate at a distance from the orifice, than through one nearer the same. 2. That in consequence of this, the pressure of the fluid when in motion is less than when in a state of rest. I hese two propositions will explain the preceding pheno¬ mena. In the experiment stated in 262, more water passes through a cross section of the current EG, than passes in the same time through the tube ACD ; where¬ fore a portion of the water must be carried off from the vessel CDG. So also (fig. 68), more water passes through the communicating tube ABC, than through the narrow tube a; and as no lateral motion takes place, a portion of the water in HF will pass along ABC, and its level falls. If the surface in HF should sink, while the overplus of water in HE flows out by K, or if there be a constant level in HE, then the jet is affected by the pressure due to the difference of level, and the moving force is diminished, so that it is less at a cross section of ABC at A, than in the jet tube a. rl herefore, the volume of fluid which passes in a unit of time through A will decrease, and the fluid sur¬ face in HF will continue to sink, until the volume of fluid passing through a section of A in a unit of time, be equal to a volume which, during the same time, passes through A. The difference of level will enable us to determine the pressure. If, on the fluid surface of HF reaching the lower face of ABC, it happen that the above condition of equality of volumes be not fulfilled, then the water in the tube is less pressed in the direction from A to B than from B to A, al¬ though the statical pressure in the latter direction is that due to the atmosphere, while in the former it is the atmospheric pressure plus the weight of a column the height of which is that due to the difference of levels. This excess of press¬ ure at B causes the air to enter the tube in bubbles. 427. The same is the explanation of the phenomena at¬ tendant on the experiment (fig. 69) where a thin jet pre¬ vented the flow of water from an orifice in a vessel: the air entered the water through that tube, and it continued to do so till the fluid in the vessel attained such a height, that the pressures at each end of the tube were equal. If the inner pressure be in excess, the water flows out by the orifice. 428. In conducting these experiments, he found that the pressure of a moving fluid was less than that of a fluid at rest. Ihus, when the fluid is stopped by the plate, the water, being resisted in its progress, now moves along parallel to the plate, which, when of a proper magnitude, must diminish the pressure against the plate. Therefore, necessarily, since fluids press equally in all directions (art. 48), the pressure from behind the plate must be greater than on that side facing the jet. This difference will increase if we increase the velocity of the jet and the magnitude of the plate. If the plate be brought nearer the orifice, the velo¬ city of the jet will be greater upon the plate, for then the vein has not had time to widen, and consequently the space through which the water has to pass parallel to the plate is increased. Hence, the nearer that the plate is to the orifice, the greater is the difference of pressure before and behind, and the less will be the force required to bring the plate back to its position of equilibrium. This result con¬ tinues till the difference of pressure vanishes. This fact may be shown experimentally, by having one plate parallel Experi. to another, both vertical, one fixed and having an orifice, meats on the other free and connected with a balance; then when a potion jet is sent through the former, the difference of pressure on ° the latter will force it nearer to the fixed plate. The same thing will take place when a column of air is made to act on a plate similarly circumstanced as the above. 429. The whirling motion stated in article 425 is due to the lateral motion imparted to the water by a strong jet. If the orifice be not too small and expanded vertically, and it the water have a sufficient velocity, funnel-shaped con¬ cavities are formed; for the water within these small whirl¬ pools continually streams towards their outer rim, and so the pressure at the centre is diminished. Many other phe¬ nomena are dependent on this lateral motion. 7. Experiments of M. V Regnault. 430. In the Memoires de VInstitut for 1847, M. Reg- nault gives an account of his experiments, which were un¬ dertaken for the purpose of determining the principal laws and numerical data which enter into the calculation of steam-engines. The nature of his investigations necessarily led him to experiment on the compressibility of water and mercury, and his deductions on this subject may be consi¬ dered as very accurate. The process which Oersted, Col- ladon and Sturm, and Aime adopted was very simple, and, generally speaking, may be described as follows :—A liquid is placed in a kind of thermometer or vessel of considerable capacity surmounted by a graduated capillary tube, open at the top, the divisions being for finding the ratio of the volume between any two divisions, and that of the vessel. This ap¬ paratus or piezometer, is placed in an experimenting glass vessel, with strong walls, and furnished with a metal cover¬ ing, which communicates on one side with a forcing-pump, and on the other with a manometer. The latter strong vessel is filled with water, and as soon as the pump begins to work, a pressure, more or less great, is exercised on the sides of the vessel; at the same time the internal and ex¬ ternal walls of the piezometer are subjected to compression, and the liquid acted on is diminished in volume. The level of the liquid in the graduated tube now falls, it may be, through several divisions; but this will be a means of cal¬ culating the diminution of volume that the liquid, subject to pressure, as measured by the manometer, has experi¬ enced. It is only, however, the apparent, not the absolute compressibility, owing to the change of dimension of the piezometer during the operation. Oersted supposed that no change took place. 431. M. Regnault’s apparatus consisted also of a piezometer, but so disposed that he obtained at once the compressibility of the liquid, and that of the envelope containing it. He employed air to exercise the compression, because it pre¬ sents greater advantages than when water is pumped in ; the pressures, eg., are always constant, and they may be measured with great precision. The piezometers he used were most carefully constructed, being first made into he¬ mispheres, and then soldered together. The following table will show us the mean results obtained :— Envelope or Piezometer. Spherical, cop- ) Per i Spherical, brass Cylindrical, 1 glass } Cylindrical, 1 glass J Pressure in atmo¬ spheres varying from 2 8033 to 7-8220 1- 5842 to 9-1206 2- 5387 to 10-3528 3- 3368 to 9-5408 Compressibility of water. Apparent. 0-000046392 0-000046847 0000044304 Compressibility 0-000001234 Theoretical. 0-000047709 0-000048288 0-000046677 of Mercury. 0-000003517 The tabulated results of M. Regnault, of which the first on the table is the mean, show that as the pressure in- HYDRODYNAMICS. 159 On the creased, the compressibility of the water sensibly diminished, Resistance anc] that of the envelope was irregular ; this was owing to of Fluids. tjie high malleable and low elastic power of the copper. The results of those tables, of which the second and the third are the mean, did not show this diminution, owing, perhaps, to the high elastic power of the brass and glass, and the low malleable nature of the former. Hence, when water is subjected to a pressure of 15 lbs. on the square inch, or one atmosphere, it is diminished by 48 volumes in one million of the same; i.e., if there be a million cubic inches of water, then if the mass be subjected to a pressure On the of 1, 2. 3, 4, &c., atmospheres, the diminution of its volume Resistance will be 1 x 48, 2 x 48, 3 x 48, 4 x 48, &c., cubic inches. ofFluids. When mercury was subjected to pressure, the tabulated “v J results, of which the fourth is the mean, showed that the apparent differed much from the theoretical compressibility, owing probably to the difficulty of the operation. J he liquid, however, is regarded as compressible to the extent of 35 volumes in every 10 million, for each compressing atmosphere. CHAPTER III.—ON THE RESISTANCE OF FLUIDS. 432. The celebrated Coulomb has very successfully em¬ ployed the principle of torsion, to determine the cohesion of fluids, and the laws of their resistance in very slow mo¬ tions. When a body is struck by a fluid with a velocity exceeding eight or nine inches per second, the resistance has been found proportional to the square of the velocity, whether the body in motion strikes the fluid at rest, or the body is struck by the moving fluid. But when the velo¬ city is so slow as not to exceed four-tenths of an inch in a second, the resistance is represented by two terms, one of which is proportional to the simple velocity, and the other to the square of the velocity. The first of these sources of resistance arises from the cohesion of the fluid particles which separate from one another, the number of particles thus separated being proportional to the velocity of the body. The other cause of resistance is the inertia of the particles, which, when struck by the fluid, acquire a certain degree of velocity proportional to the velocity of the body; and as the number of these particles is also proportional to that velocity, the resistance generated by their inertia must be proportional to the square of the velocity. When the body in motion, therefore, meets the fluid at rest, Sir Isaac Newton, Daniel Bernouilli,and M.Gravesende maintained that the formula which represents the resist¬ ance of fluids consists of two terms, one of which is as the square of the velocity, and the other constant. The experiments of Coulomb, however, incontestably prove that the pressure which the moving body in this case sus¬ tains, is represented by two terms, one proportional to the simple velocity, and the other to its square, and that if there is a constant quantity, it is such as escapes detection. 433. In order to apply the principle of torsion to the re¬ sistance of fluids, M. Coulomb made use of the apparatus represented in fig. 73. On the horizontal arm LK, which fastened, by means of a screw, the brass wire ag, whose force of torsion is to be compared with the resistance of the fluid; and its lower extremity is fixed in the same wray into a cylinder of copper gd, whose diameter is about four- tenths of an inch. The cylinder gd is perpendicular to the disk DS, whose circumference is divided into 480 equal parts. When this horizontal disk is at rest, which happens when the torsion of the brass wire is nothing, the fixed index RS is placed upon the point 0, the zero of the circular scale. The small rule Rm may be elevated or depressed at plea¬ sure round its axis n, and the stand CH which supports it may be brought into any position round the horizontal disk. The lower extremity of the cylinder gd is immersed about two inches in the vessel of water MNOP, and to the ex¬ tremity d is attached the planes, or the bodies whose re¬ sistance is to be determined when they oscillate in the fluid by the torsion of the brass wire. In order to produce these oscillations, the disk DS, supported by both hands, must be turned gently round to a certain distance from the index, without deranging the vertical position of the suspended wire. The disk is then left to itself; the force of torsion causes it to oscillate, and the successive diminutions of these oscillations are carefully observed. 434. The method employed by Coulomb, in reducing his experiments, is similar to that adopted by Newton and other mathematicians, when they wished to determine the resistance of fluids, from the successive diminutions of the oscillations of a pendulum moving in a resisting medium ; but is much better fitted for detecting the small quantities which are to be estimated in such researches. When the pendulum is employed, the specific gravity of the body, re¬ lative to that of the fluid, must be determined; and the least error in this point leads to very uncertain results. When the pendulum is in different points of the arc in which it oscillates, the wire or pendulum rod is plunged more or less in the fluid; and the alterations which may result from this are frequently more considerable than the small quantities which are the object of research. It is only in small oscillations too, that the force which brings the pendulum from the vertical, is proportional to the angle which the pendulum rod, in different positions, forms with this vertical line; a condition which is necessary before the formulae can be applied. But small oscillations are attend¬ ed with great disadvantages; and their successive diminu¬ tions cannot be determined but by quantities which it is difficult to estimate exactly, and which are changed by the smallest motion either of the fluid in the vessel, or of the air in the chamber. In small velocities, the pendulum rod experiences a greater resistance at the point of flotation than at any other part. This resistance too, is very changeable; for the water rises from its level along the pendulum rod to greater or less heights, according to the velocity of the pendulum. 435. These and other inconveniences which might be mentioned, are so inseparable from the use of the pendu¬ lum, that Newton and Bernouilli have not been able to determine the laws of the resistance of fluids in very slow motions. When the resistance of fluids is compared with 1 160 HYDRODYNAMICS. On the the force of torsion, these disadvantages do not exist. The Resistance boc|y is jn case entirely immersed in the fluid ; and as of Minds. every p0int Gf its surfaCe oscillates in a horizontal plane, the relation between the densities of the fluid and the oscil¬ lating body has no influence whatever on the moving force. One or two circles of amplitude may be given to the os¬ cillations; and their duration may be increased at plea¬ sure, either by diminishing the diameter of the wire, or in¬ creasing its length ; or, which may be more convenient, by augmenting the momentum of the horizontal disk. Cou¬ lomb, however, found that when each oscillation was so long as to continue about 100 seconds, the least motion of the fluid, or the tremor occasioned by the passing of a car¬ riage, produced a sensible alteration on the results. The oscillations best fitted for experiments of this kind con¬ tinued from 20 to 30 seconds, and the amplitude of those that gave the most regular results was comprehended be¬ tween 480 degrees, the entire division of the disk, and 8 or 10 divisions reckoned from the zero of the scale. From these observations, it will be readily seen, that it is only in very slow motions that an oscillating body can be employ¬ ed for determining the resistance of fluids. In small oscil¬ lations, or in quick circular motions, the fluid struck by the body is continually in motion ; and when the oscillating body returns to its former position, its velocity is either in¬ creased or retarded by the motion communicated to the fluid, and not extinguished. 436. In the first set of experiments made by Coulomb, he attached to the lower extremity of the cylinder gd a circular plate of white iron, about 195 mill, in diameter, and made it move so slowly that the part of the resistance proportional to the square of the velocity wholly disappeared. For if, in any particular case, the portion of the resistance proportional to the simple velocity should be equal to the portion that is proportional to the square of the velocity when the body has a velocity of one-tenth of an inch per second, then, when the velocity is 100-tenths of an inch per second, the part proportional to the square of the ve¬ locity will be a hundred times greater than that proportional to the simple velocity; but if the velocity is only the hundredth part of the tenth of an inch per second, then the part proportional to the simple velocity will be 100 times greater than the part proportional to the square of the ve¬ locity, 437. When the oscillations of the white-iron plate were so slow, that the part of the resistance which varies with the second power of the velocity was greatly inferior to the other part, he found, from a variety of experiments, that the resistance which diminished the oscillations of the hori¬ zontal plate was uniformly proportional to the simple velo¬ city ; and that the other part of the resistance, which fol¬ lows the ratio of the square of the velocity, produced no sensible change upon the motion of the white-iron disk. He also found, in conformity with theory, that the mo¬ menta of resistance in different circular plates moving round their centre in a fluid, are as the fourth power of the dia¬ meters of these circles; and that, when a circle of 195 mill. (7'677 English inches) in diameter, moved round its centre in water, so that its circumference had a velocity of 140 mill. (5'512 English inches) per second, the momentum of resistance which the fluid opposed to its circular motion was equal to one-tenth of a gramme (1*544 English troy grains) placed at the end of a lever 143 mill. (5*63 English inches) in length. 438. M. Coulomb repeated the same experiments in a vessel of clarified oil, at the temperature of 16 degrees of Reaumur. He found, as before, that the momenta of the resistance of different circular disks, moving round their centre in the plane of their superficies, were0as the fourth power of their diameters; and that the difficulty with which the same horizontal plate, moving with the same velocity, separated the particles of oil, was to the difficulty with On the which it separated the particles of water, as 17*5 to 1, Resistance which is therefore the ratio that the mutual cohesion of the of Fluids, particles of oil has to the mutual cohesion of the particles of water. 439. In order to ascertain whether or not the resistance of a body moving in a fluid was influenced by the nature of its surface, M. Coulomb anointed the surface of the white-iron plate with tallow, and wiped it partly away, so that the thickness of the plate might not be sensibly in¬ creased. The plate was then made to oscillate in water, and the oscillations were found to diminish in the same manner as before the application of the unguent. Over the surface of the tallow upon the plate, he afterwards scat¬ tered, by means of a sieve, a quantity of coarse sand which adhered to the greasy surface; but when the plate, thus prepared, was caused to oscillate, the augmentation of re¬ sistance was so small that it could scarcely be appreciated. We may therefore conclude, that the part of the resistance which is proportional to the simple velocity, is owing to the mutual adhesion of the particles of the fluid, and not to the adhesion of these particles to the surface of the body. 440. If the part of the resistance varying with the simple velocity were increased when the white-iron plate was im¬ mersed at greater depths in the water, we might suppose it to be owing to the friction of the water on the horizontal surface, which, like the friction of solid bodies, should be proportional to the superincumbent pressure. In order to settle this point, M. Coulomb made the white-iron plate oscillate at the depth of two centimetres (*787 English inches), and also at the depth of 50 centimetres (19*6855 English inches), and found no difference in the resistance; but as the surface of the water was loaded with the whole weight of the atmosphere, and as an additional load of 50 centimetres of water could scarcely produce a perceptible augmentation of the resistance, M. Coulomb employed an¬ other method of deciding the question. Having placed a vessel full of water under the receiver of an air-pump, the receiver being furnished with a rod and collar of leather at its top, he fixed to the hook, at the end of the rod, a harp¬ sichord wire, number 7 in commerce, and suspended to it a cylinder of copper, like gd, fig. 89, which plunged in the water of the vessel, and under this cylinder he fixed a circular plane, whose diameter was 101 millimetres (3*976 English inches). When the oscillations were finished, and consequently the force of torsion nothing, the zero of tor¬ sion was marked by the aid of an index fixed to the cylin¬ der. The rod was then made to turn quickly round through a complete circle, which gave to the wire a complete circle of torsion, and the successive diminutions of the oscillations were carefully observed. The diminution for a complete circle of torsion w*as found to be nearly a fourth part of the circle for the first oscillation, but always the same whether the experiment was made in a vacuum or in the atmosphere. A small pallet 50 millimetres long (1*969 English inches) and 10 millimetres broad (0*3937 English inches), which struck the water perpendicular to its plane, furnished a similar result. We may therefore conclude, that when a submerged body moves in a fluid, the pressure which it sustains, measured by the altitude of the superior fluid, does not perceptibly increase the resistance; and, conse¬ quently, that the part of this resistance proportional to the simple velocity, can in no respect be compared with the friction of solid bodies, which is always proportional to the pressure. 441. The next object of M. Coulomb was to ascertain the resistance experienced by cylinders that moved very slowly, and perpendicular to their axis; but as the particles of fluid struck by the cylinder necessarily partook of its motion, it was impossible to neglect the part of the resist¬ ance proportional to the square of the velocity, and there- HYDKODYNAMICS. 161 On the fore he was obliged to perform the experiments in such a Resistance manner that both parts of the resistance might be computed, of Fluids, 'pjjg three cylinders which he employed were 249 mill. (O'SOSl English inches) long. The first cylinder was 0-87 mill. (00342 English inches, or-^g-th of an inch) in circum¬ ference, the second 1T2 mill. (0-4409 English inches), and the third 21-1 mill. (-83070 English inches). They were fixed by their middle under the cylindrical piece Dg, so as to form two horizontal radii, whose length was 124-5 mill. (4-9015 English inches) or half the length of each cylin¬ der. After making the necessary experiments and compu¬ tations, he found that the part of the resistance proportional to the simple velocity, which, to avoid circumlocution, we shall call r, did not vary with the circumferences of the cylinders. The circumferences of the first and third cylin¬ ders were to one another as 24: 1, whereas the resistances were in the ratio of 3:1. The same conclusion w-as de¬ duced by comparing the experiments made with the first and second cylinder. 442. In order to explain these results, M. Coulomb very justly supposes, that, in consequence of the mutual adhe¬ sion of the particles of water, the motion of the cylinder is communicated to the particles at a small distance from it. The particles which touch the cylinder have the same velo¬ city as the cylinder, those at a greater distance have a less velocity, and at the distance of about one-tenth of an inch the velocity ceases entirely, so that it is only at that distance from the cylinder that the mutual adhesion of the fluid molecules ceases to influence the resistance. The resist¬ ance r, therefore, should not be proportional to the circum¬ ference of the real cylinder, but to the circumference of a cylinder whose radius is greater than the real cylinder by one-tenth of an inch. It consequently becomes a matter of importance to determine with accuracy the quantity which must be added to the real cylinder in order to have the radius of the cylinder to which the resistance r is pro¬ portional, and from which it must be computed. Coulomb found the quantity by which the radius should be increased to be 1*5 mill, (x^tu^8 an English inch), so that the diameter of the augmented cylinder will exceed the dia¬ meter of the real cylinder by double that quantity, or xVVo^18 of an inch. 443. The part of the resistance varying with the square of the velocity, or that arising from the inertia of the fluid, which we shall call R, was likewise not proportional to the circumferences of the cylinder; but the augmentation of the radii amounts in this case only to x^ott^s of an inch, which is only one-fifth of the augmentation necessary for finding the resistance r. The reason of this difference is obvious; all the particles of the fluid when they are sepa¬ rated from each other oppose the same resistance, what¬ ever be their velocity; consequently, as the value of r de¬ pends only on the adhesion of the particles, the resistances due to this adhesion will reach to the distance from the cylinder where the velocity of the particles is 0. In com¬ paring the different values of R, the part of the resistance which varies as the square of the velocity, all the particles are supposed to have a velocity equal to that of the cylin¬ der ; but as it is only the particles which touch the cylinder that have this velocity, it follows that the augmentation of the diameter necessary for finding R must be less than the augmentation necessary for finding r. 444. In determining experimentally the part of the mo¬ mentum of resistance proportional to the velocity, by two cylinders of the same diameter, but of different lengths, M. Coulomb found that this momentum was proportional to the third power of their lengths. The same result may be deduced from theory; for supposing each cylinder divided into any number of parts, the length of each part will be proportional to the whole length. The velocity of the cor¬ responding parts M ill be as these lengths, and also as the VOL. XII. distance of the same parts from the centre of rotation. The On the theory likewise proves that the momentum of resistance Resistance depending on the square of the velocity, in two cylinders of ° y the same diameter but of different lengths, is proportional to the fourth power of the length of the cylinder. 445. When the cylinder, 9-8031 inches in length, and 0"4409 inches in circumference, was made to oscillate in the fluid with a velocity of 5*51 inches per second, the part of the resistance r was equal to 58 milligrammes, or "8948 Troy grains. And when the velocity was 0"3937 inches per second, the resistance r was 0-00414 grammes, or -0638 Troy grains. 446. The preceding experiments were also made in the oil formerly mentioned; and it likewise appeared, from their results, that the mutual adhesion of the particles of oil was to the mutual adhesion of the particles of water as 17 to 1. But though this be the case, M. Coulomb discovered that the quantity by which the radii of the cylinder must be augmented in order to have the resistance r, is the very same as when the cylinder oscillated in water. This result was very unexpected, as the greater adhesion between the particles of oil might have led us to anticipate a much greater augmentation. When the cylinders oscillated both in oil and water with the same velocity, the part of the re¬ sistance R produced by the inertia of the fluid particles which the cylinder put in motion, was almost the same in both. As this part of the resistance depends on the quan¬ tity of particles put in motion, and not on their adhesion, the resistances due to the inertia of the particles will be in different fluids as their densities. 447. The subject of the resistance of fluids has been treated by Dr Hutton of Woolwich. His experiments were made in air with bodies of various forms, moving with different velocities, and inclined at various angles to the direction of their motion, and the following conclusions were deduced from them:—1. That the resistance is nearly pro¬ portional to the surfaces, a small increase taking place when the surfaces and the velocities are great. 2. The resist¬ ance to the same surface moving with different velocities, is nearly as the square of the velocity ; but it appears that the exponent increases with the velocity. 3. The round and sharp ends of solids sustain a greater resistance than the flat ends of the same diameter. 4. The resistance to the base of the hemisphere is to the resistance on the con¬ vex side, or the whole sphere, as 2^ to 1, instead of 2 to 1, as given by theory. 5. The resistance on the base of the cone is to the resistance on the vertex nearly as 2T^ to 1; and in the same ratio is radius to the sine of half the angle at the vertex. Hence in this case the resistance is directly as the sine of the angle of incidence, the transverse section being the same. 6. The resistance of the base of a hemi¬ sphere, the base of a cone, and the base of a cylinder, are all different, though these bases be exactly equal and similar. 448. The experiments of Mr Vince were made with bodies at a considerable depth below the surface of water; and he determined the resistance which they experienced, both when they moved in the fluid at rest, and M-hen they received the impulse of the moving fluid. In the experi¬ ments contained in the following table, the body moved in the fluid with a velocity of 0-66 feet in a second. The angles at which the planes struck the fluid are contained in the first column. The second column shows the resistance by experiment in the direction of their motion in Troy ounces. The third column exhibits the resistance by theory, the perpendicular distance being supposed the same as by experiment. The fourth column shows the power of the sine of the angle to which the resistance is propor¬ tional, and was computed in the following manner :—Let s be the sine of the angle, radius being 1, and r the resist¬ ance at that angle. Suppose r to vary as then we have 162 On the Resistance ^ of Fluids. HYDKODYNAMICS. sm=0‘2Z2\ : r; hence s = and therefore 0-2321’ log. r — log. 0-2321 , , , . ~ log. r —log. s ’ ant* substituting their corre¬ sponding values, instead of r and s we shall have the values of m or the numbers in the fourth column. Resistance of a Plane Surface moving in a Fluid, and placed at different angles to the path of its motion. Angle of inclination. Degrees. 10 30 50 70 90 Resistance by experiment. Troy ounces. 00112 00769 01552 0-2125 0-2321 Resistance by theory. Troy ounces. 0-0012 00290 01043 0-1926 0-2321 Power of the sine of the angle to which the resistance is proportional. Experiments. 1‘73 1-54 1-51 1-42 44& According to the theory the resistance should vary as the cube of the sine, whereas from an angle of 90° it decreases in a less ratio, but not as any constant power, nor On th resLIc'Tr °f the Sin,e a"d C0Si"e- He"“ ‘he actual Resistance stance always exceeds that which is deduced from of Fluids. theoiy, assuming the perpendicular resistance to be the same. ie cause of this difference is partly owing to our theory neglecting that part of the force which after resolu- ion acts parallel to the plane, but which, according to ex- plaue entS’ 18 rea y a Part °f the force which acts uPon t,le 450. Mr Vince made also a number of experiments on the resistance of hemispheres, globes, and cylinders, which moved with a velocity of 0-542 feet per second. He found !'fc fthe.resistance t0 the spherical side of a hemisphere ,as , t,le resistance on its base as 0-034 is to 0-08339• that the resistance of the flat side of a hemisphere was to the resistance of a cylinder of the same diameter, and mov¬ ing with the same velocity, as 0-08339 is to 0-07998; and that the resistance to a complete globe is to the resistance a cylinder of the same diameter, and with the same ve- locity, as 1 i 2*23* When the plane was struck by the moving fluid, Dr ince found that the resistance was one-fifth greater than when the plane moved in the fluid. In both these cases t e actual effect on the plane must be the same, and there- foie the difference in the resistance can arise only from the action of the fluid behind the body in the former case. CHAPTER IV. ON THE OSCILLATION OF FLUIDS, AND THE UNDULATION OF WAVES. 451. Prop. I.—-The oscillations of water in a siphon, con¬ sisting of two vertical branches and a horizontal one, are isochronous, and have the same duration as the oscillations of a pendulum whose length is equal to half the length of the oscillating column of water. Into the tube MNOP (fig. 74), having its internal dia¬ meter everywhere the same, intro¬ duce a quantity of water. When the water is in equilibrio, the two surfaces AB, CD will be in the same E horizontal line AD. If this equili¬ brium be disturbed by making the siphon oscillate round the point g, K the water will rise and fall alternately in the vertical branches after the siphon is at rest. Suppose the water to rise to EF in the branch MO, it will evidently fall to GH in the other branch, so that CG is equal to AE. Then it is evident, that the force which makes the water oscillate, is Fig. 74. t ie weight of the column EFKL, which is double the co umn ABF ; and that this force is to the whole weight of the water, as 2 AE is to AOPD. Now, let P (fig. 75) be a pendulum whose length is equal to half the length of the oscillating column AOPD, and which describes to the lowest point S arcs PS, equal to AE ; then 2 AE : AOPD = AE : QP, because AE is one-half of 2 AE, and QP one-half of AOPD. Consequently, since AOPD is a constant quantity, the force which makes the water oscillate is always pro- rig- 75- portional to the space which it runs through, and its oscil lations are therefore isochronous. The force which makes the pendulum describe the arc PS, is to the weight of *e pendulum “s PS is to PQ or as AE is to PQ, since • 7 V, 5 - ^ the force whlch makes the water oscillate is to the weight of the whole water in the same ratio ; con¬ sequently, since the pendulum P, and the column AOPD are influenced by the very same force, their oscillations must be performed m the same time. Q. E. D. 452. Cor.—As the oscillations of water and of pendulums are regulated by the same laws, if the oscillating column of water is increased or diminished, the time in which the oscillations are performed will increase or diminish in the subduphcate ratio of the length of the pendulum. 453. Prop. II. The undulations of waves are performed in the same time as the oscillations of a pendulum whose length is equal to the breadth of a wave, or to the distance between two neighbouring cavities or eminences. A c E Fig. 76. In the waves ABCDEF (fig. 76), the undulations are per¬ formed in such a manner, that the highest parts ACE be¬ come the lowest; and as the force which depresses the emi¬ nences A, C, E is always the weight of water contained in these emmences, it is obvious, that the undulations of waves are of the same kind as the undulations or oscillations of water in a siphon. It follows, therefore, from Prop. L, that if we take a pendulum, whose length is one-half BM, or half the distance between the highest and lowest parts of the wave, the highest parts of each wave will descend to the lowest parts during one oscillation of the pendulum, and in the time of another oscillation will again become the highest parts. The pendulum, therefore, will perform two oscillations in the time that each wave performs one undu- ation, that is, in the time that each wave describes the space AC or BD, between two neighbouring eminences or HYDRODYNAMICS. On Water- cavities, which is called the breadth of the wave Now, if Wheels. a pendulum whose length is one-half BM perform two v—' oscillations in the above time, it will require a pendulum four times that length to perform only one oscillation in the same time, that is, a pendulum whose length is AL or BL>, since 4 x ^ BM = 2 BM = AC or BD. Q, E. D. 163 On Water- Wheels. PART III.—ON HYDRAULIC MACHINERY. 454. To describe the various machines in which water is the impelling power, would be an endless and unprofit¬ able task. Those machines which can be driven by wind, steam, and the force of men or horses, as well as they can be driven by water, do not properly belong to the science of hydraulics. By hydraulic machinery, therefore, we are to understand those various contrivances by which water can be employed as the impelling power of machinery ; and those machines which are employed to raise water, or which could not operate without the assistance of that fluid. 455. A Hydraulic Machine will thus be one composed of a number of pieces, levers, or wheel-work, made up in such a way, that the movement impressed by water-power transmits itself from one part to another, and produces a certain re- sult. _ Hydraulic machines are of two kinds,—Machines having a motion of rotation ; and, 2d, Machines having an al¬ ternate motion. Under the first are comprehended hydraulic wheels, with turbines and reacting machines ; and the second comprises water-column machines, and the hydraulic ram. 456. When a mover, as water, acts on a machine, it ex¬ ercises on the part impinged on a pressure or effort: the immediate effect of this effort will be to make the part struck move in the direction of the power, or in some con¬ strained direction ; in either case space will be passed through by the part. Let a = the effect in lbs., and ^ = the space passed through, then a.s = the sum of all the partial efforts developed by the machine, or the quantity of action developed by the mover in the operation; by some writers it is termed the mechanical work, or the work done. Again, the dynamical force, or the force of a movei, will be the quantity of action developed in a unit or second of time ; it will thus be the product of the effort and velocity, or, a.s = a.v, since in 1 second s—v. 457. Before, however, the force impressed on the pa¬ lettes of a wheel can transmit its effect to the machinery to be set in motion, it experiences resistance from the pivots and from the air, friction from the teeth of wheels, and shocks of the teeth against the spindles. These re¬ sistances combined, make up a force which necessarily di¬ minishes that originally derived from the mover. Hence, it is this diminished force that turns the machinery of a mill, and surmounts the resistance that the corn, for ex¬ ample, opposes to the grinding. The force necessary to overcome this resistance is named the useful effect; Mont- o-olfier’s definition of the same thing is—the active force is that which pays itself. There are, again, as it were inheient resistances connected with various pieces of the apparatus, which are called the passive resistances of the machine, the useful effect being taken for the active resistance sur¬ mounted. The total action of the passive resistances, to¬ gether with the useful effect produced, make up the dyna¬ mical effect. It is clear, also, that the mechanical axiom, what is gained in power is lost in time or velocity, will hold good in hydraulics. Lastly, the total effect produced is 'equal to the force impressed on the machine. CHAPTER I.*—MACHINES HAYING A MOTION OF ROTATION. Water-wheels have either a vertical or horizontal axis, and named respectively Horizontal and Vertical Wheels. The following table is a classification of machines having a motion of rotation course ( rectilineal. Undershot Wheels. | circular. , indefinite fluid. Suspended Wheels. Poncelet Wheels. (with ( plane, ( palettes / in a < ' I , Ul V curved. " I buckets ( at t^ie summit. Overshot Wheels. 1 receiving \ under the summit. Breast Wheels. 1 water V _w ( struck by an isolated vein. •2 | with J pjace(j a cylinder. Tub or Spoon Mills. o I Palettes ( out 0f a cylinder. Turbines of Fourneyron. 'S l with passages. Burdin's Turbine. \B (with reaction. Segner's Wheel or Barker s Mill; Euler, ate. SECTION I. VERTICAL WHEELS, AXIS HORIZONTAL. ( a.) Undershot Wheels vjith plain Palettes. 458. Wheels with plain palettes are very simple in their parts and also in their construction. They generally con¬ sist of a horizontal axis, an inner and outer circle, on the latter of which perpendicular palettes or flat boardo are fixed, and radii unite the several parts to the hori¬ zontal axis. Such a wheel (fig. 77) is set in motion by water conveyed to it by a course, which may be rectilineal or circular. In the former case, there is a flood-gate close to the wheel, collecting a head of water which is distributed by the gate when a very little uplifted, so that the water may just strike the lower palettes, and not pass between their edge and the course. In the latter we may have a course curved like that in fig. 77. The fall in that answers the same purpose as the flood-gate a little uplifted. When a flood-gate is used, it should be set as near the wheel as possible, in order that the water might lose none of its velocity from the resistance of the bottom or side- walls of the course. The opening of the flood-gate should be so disposed that the contraction of the water might be reduced to its least value; and the flood-gate itself should be inclined, which is the same thing as if the opening were brought nearer the wheel. It has been found that in a flood¬ gate inclined at an angle of 63° to the horizon, having 1 for base and 2 for height, the coefficient of contraction is 0-75 ; under an inclination of 45 the coefficient is 0 80, having 1 for base and 1 for height; and when the gate is vertical, in the same circumstances, it is about 0-70. 459. The course should be slightly inclined towards the wheel; its breadth should be determined by the volume of water which it is to convey ; and the thickness of the fluid sheet escaping from under the flood-gate should never exceed 0-820^ ft., nor be less than 0-492 ft. When it is smaller than this, so much water passes between the lower edge of the palettes and course, without producing any eftect, thus diminishing the work of the water. The space between the walls of the course and the palettes should be from 0*032 ft. to 0-065 ft. The course should never be purely rectilineal; it should be somewhat inclined before reaching the flood-gate, where the water ought to strike the second palette at least from the vertical; then it must be concentrical with the exterior border of the palettes, and immediately after a palette has become vertical, the course should suddenly fall 3’93 inches at least; the water may then be conveyed away according to the locality. I he 164 HYDRODYNAMICS. On Water- breadth of the course before reaching the palettes is a little Wheels. narrower than the breadth of the wheel, but now it widens, ' and just embraces the wheel. 460. The breadth of the palettes will depend on that of the course, and on the magnitude of the intervals; their height will be about three times the thickness of the sheet issuing from under the flood-gate, never exceeding 2‘13 ft. The distance between one board and another, measured on the periphery of the wheel, is a little less than their height. The number of palette-boards will depend on the diameter or circumference of the wheel. The dynamical effect of the wheel is not dependent on the diameter; it takes account of the velocity of the boards, or rather on the number of turns that the wheel makes in a certain time, so that the useful effect may be communicated to the machinery set in motion. Let u be the velocity per second of the extremity of the boards, n the number of turns in one minute; then 1 turn will be effected in the nth. part of 1 min., or the 00 diameter will be expressed by —— = 19-1 It has it .n n been found that, for a good effect, m=L7 x \/h ; and so 32 the diameter of the wheel will be — x \/h, where H is the total fall of water. Generally, the diameter is never less than 13 ft., and never in excess of 26 ft. With respect to the number of palettes, artificers gene¬ rally adopt the rule, that— Under a diameter of 13-1 ft. the number of boards is 28 16-4 ... ... ... 32 19-7 ... ... ... 36 23 0 ... ... ... 40 and so on. Four boards being added for every 3 feet of breadth to the diameter of the wheel. 461. It is not advantageous to have the palettes inclined to the direction of the radius, when the water is conveyed by a course, for Bossut found that when he inclined the boards at angles of 0°, 8°, 12°, and 16°, the effects were respec¬ tively as the numbers 1, 0-949, 0-956, 0-998. Inclined paddles are very useful when plunged in an indefinite fluid. 462. In order that such a wheel may be put in motion, the water leaves the opening under the flood-gate with a velo¬ city due to the head pent up behind the flood-gate; this water impinging on the palettes with a considerable pres¬ sure, imparts a movement of rotation to the wheel. But this velocity depends on the resistance to be overcome, so that if the resistance be considerable, the velocity will be lessened. Again the pressure exercised by the water on the boards, is not the same when they are moving as when they are at rest, for the pressure is feebler in proportion as the wheel moves quicker. Hence, therefore, the wheel must take a particular velocity by overcoming a given re¬ sistance, that the pressure on the boards may correspond with this resistance. The wheel, however, may be made to take any velocity, by regulating the resistance which it has to overcome ; but the amount of work given to the wheel by the water will not always be the same unless the wheel turn with a certain velocity. This velocity must be neither too great nor too small; it must be such that the work done by the wheel will exceed that which it would produce with any other velocity. Experiment has shown that this maximum work is attained when the velocity of the wheel, measured by its circumference, is 045 times that of the water on arriving at the palette boards. When the wheel has this velocity, it is found that the work done by it does not exceed 025 the work of the water, so that nearly 0-75 of this latter work is lost. 463. It is very important, for those especially who em¬ ploy water-wheel power, to know the work which their wheels are capable of giving out. The general equation for tins kind of wheel is the followingLet a constant stream impinge perpendicularly on the boards of a water¬ wheel moving with a certain velocity, W being the weight of a current thrown on the paddle-board every second; V, and V the velocity of the water on striking and on caving the board ; and V' that of the moving board; then the velocity lost will be V — V', and the work lost by impact =|(v-vt; and the work which the stream is capable of giving out W. V2 W , W r f -2^V-V)2=^{V2-(V-V')2} = P + % W.V"2 *9 which last = the useful work + the work re¬ maining in the water after leaving the paddle. On Water-' Wheels. 464. In the case of this Undershot wheel, P = —(V _ V'W' for V only is variable and = V"; if V' = 0, the wheel does no useful work, and so also when V = V'; also V' can nevei exceed V. Ihus the effect increases as the velocity of the wheel, starting from zero, increases, but only up to a certain point, for it evidently diminishes when it approaches V. Hence, there is a maximum effect between these two extremes, that is to say, (V — V') V' is to be a maximum ; .\V.dV-2\'.dV=0- or V'=l.V; or an undershot wheel produces its utmost effect when its velocity is one-half that of the current. Borda first showed the truth of the above result; it has been fully confirmed by the experiments of Smeaton, Bos¬ sut, and others. 465. Many experiments have been made on undershot wheels. Smeaton has given the results which he obtained in the Royal Society Trans, for 1759. It is supposed that his model wheel was of too small dimensions to give very accurate results for practice. The value which Smeaton al¬ lowed for the velocity of the wheel, or V', was V' = 0-40 x V. Bo&sut reckoned it of the same value. More recent expe¬ riments, however, regard it as = 045xV for the case of the maximum effect. The coefficient also for reducing the theoretical to the real effect may be taken as = 0"6. Smeaton’s was 0-64. It is necessary, therefore, to multiply the expression P=^(V-V')Y' by w, the coefficient, to obtain the true result. 466. When an undershot wheel has a fall, the float- boards disposed on its circumference receive the impulse of the water conveyed to the lowest point of the wheel by an inclined canal. It is represented in fig. 77, where WW is the water-wheel, and ABDFHKMV the canal or mill- fig. 77. course, which conveys the water to K, where it strikes the plane float-boards no, See., and makes the wheel revolve about its axis. 467. In order to construct the mill-course to the great¬ est advantage, we must give but a very small declivity to the canal which conducts the water from the river. It will HYDRODYNAMICS. 165 c„ Water- be sufficient to make AB slope about one inch in 200 yards, Wheels, making the declivity, however, about half an inch for the V—v—^ first 48 yards, in order that the water may have sufficient velocity to prevent it from falling back into the river. The inclination of the fall, represented by the angle GCR, should be 25° 50', or CR, the radius, should be to GR, the tan¬ gent of this angle, as 100 to 48, or as 25 to 12; and since the surface of the water S6 is bent from ab into ac before it is precipitated down the fall, it will be necessaiy to in- curvate the upper part BCD of the course into BD, that the water in the bottom may move parallel to the water at the surface of the stream. For this purpose, take the points B, D, about 12 inches distance from C, and raise the perpendiculars BE, DE. The point of intersection E will be the centre from which the arc BD is to be described; the radius being about lO^th inches. Now, in order that the water may act more advantageously upon the float-boards of the wheel WW, it must assume a horizontal direction, with the same velocity which it would have acquired when it came to the point G. But, if the water were allowed to fall from C to G, it would dash upon the horizontal part HG, and thus lose a great part of its velocity. It will be necessary, therefore, to make it move along tH, an arc of a circle to which DF and KH are tangents in the points F and H. For this purpose make GF and GH each equal to three feet; and raise the perpendiculars HI, FI, which will intersect one another in the point I, distant about 4 feet 9 inches from the points F and H, and the of the arc FH will be determined. The distance Hk, through which the water runs before it acts upon the wheel, should not be less than 2 or 3 feet, in order that the different filaments of the fluid may have attained a hori¬ zontal direction. If HK were too large, the stream would suffer a diminution of velocity by its friction on the bottom of the course. That no water may escape between the bottom of the course KH and the extremities of the float- boards, KL should be about 3 inches, and the extremity o of the float-board no ought to reach below the line HR-*-’ sufficient room being left between o and M for the play ot the wheel; or KLM may be formed into the arc of a circle KM, concentric with the wheel. The line EM V, which has been called the course of impulsion, should be prolonged so as to support the water as long as it can act upon the float-boards, and should be about 9 inches distant from OP, a horizontal line passing through O the lowest point of the fall; for, if OL were much less than 9 inches, the water, having spent the greatest part of its force in im¬ pelling the float-board, would accumulate below the wheel, and retard its motion. For the same reason another course, which has been called the course of discharge, should be connected with LMV by the curve YN, to preserve the remaining velocity of the water, which would otherwise be discharged by falling perpendicularly from V to N. 1 he course of discharge which is represented by the line VZ, sloping from the point O, should be about 16 yards long, having an inch of declivity for every 2 yards Ihe canal which reconducts the water from the course of discharge to the river should slope about 4 inches in the first 200 yards, 3 inches in the second 200 yards, decreasing gradually till it terminates in the river. But if the river to which the water is conveyed should, when swollen by the rains, force the water back upon the wheel, the canal must have a greater declivity to prevent this from taking place. Hence it is evident that very accurate levelling is requisite to the proper formation of the mill-course. so far to the right, that the extreme edges of its boards On Water- when turning round, will all but graze the circular part of vvneeis. the course, and if the walls of the passage box in the ^ v ““ wheel so that no water will escape between the palette edges and the passage, or at the side walls, we shall have a Breast or Side wheel These breast-wheels are divided into High Breast or Low Breast, according as they receive the water above or below their horizontal diameter. I he breast-wheel, fig. 78, is driven partly by the impulse, but chiefly by the weight of the water. The water may be re¬ ceived on the palettes, as in fig. 77, or by means of a flood- Fig. 78. gate, or by means of a vertical passage communicating with a reservoir at a height above the wheel; in either case the water will be delivered on the plane-boards of the wheel. In fig. 78 the water passes through an iron grating ab, and its admission is regulated by two shutters c, d, the lowest of which is adjusted till a sufficient volume of water passes over it; and the other shutter, c, is made to descend by ma¬ chinery when the wheel is to be stopped, and the water retained in the reservoir R. When the water enters on any board, it is generally retained there till it arrives at the lowest part of the wheel, and is discharged into the course. 469. Mr Lambert, of the Academy of Sciences of Berlin, experimented on these wheels, and observes, that a breast- wheel should be used when the fall of water is above four feet high and below ten.1 M. Morin has recently made ex¬ periments on this wheel, which may be seen in his Experi¬ ences sur les Roues Hydrauliques, &c. It appears from experiment that the diameter of these breast-wheels should vary from 16 to 23 ft. The number of palettes is found from art. 460, and generally they are a little inclined to the radius. 470. In determining the formula for wheels having a fall of water, we have to take into account the additional height that the water descends with the wheel, where, con¬ sequently, an additional amount of work will be performed. Let this amount of work be that due to the vertical space h, through which the water falls. Then, work applied to the wheel in one second = 7^ | V2 - (V - V )2 j + WA = the useful work P performed by the wheel + that due to the water on leaving the wheel. Let V be the velocity of the water on leaving the board ; its effective work will W . V"2 be 2<7 ,*.P + (/3.) Breast or Side Wheels, icith plain Palettes. 468. If we suppose that the wheel of fig. 77 is moved W . V"2 29 =— ( V2 - (V - V')21 +W.A; 2*? I J r)P = W.A + ^|2VV'-V*-V"!j: * Nouv. Mem* de VA.cadc'fni^ da T>crliny 1/75. 166 HYDRODYNAMICS. On Water- which is the general equation for the effective work of a Wheels. water-wheel when the water has a fall. In the case, therefore, of the Breast-wheel, h is the ver¬ tical height of the fall where the water meets the paddle, and V" = V'; ...P = W |/; + ^(V-V')V' The latter member is to be multiplied by the coefficient, which, according to M. Morin, is 0-74. This wheel may be wrought very efficiently with velo¬ cities varying from £ V to § V. 471. Suspended wheels are such as work in an indefinite course of water. The plane palettes are plunged in the current of a river, the force of which acting on the im¬ mersed boards, communicates a rotatory motion to the wheel. They are generally to be seen established on the sides of boats, or other supports properly fixed. The dia¬ meter of these wheels never exceeds 16 ft. The palette- boards may number 12, 18, or even with advantage 24; their height may be about the 4th part or more of the entire radius of the wheel, and the breadth from 8 to 16 ft.1 From experiments on this kind of wheel, it appears that the velocity of the palettes, at the middle of their height, should be, for the greatest possible effect, 0-40 that of the water. (y.) Undershot Wheels tvith curved Palettes—Poncelet Wheel. 472. The undershot wheel already mentioned in art. 458 loses a considerable amount of the force impressed upon it by water, and so the useful effect is much reduced. It was of importance to have a wheel possessing the conveniences of the undershot wheel, but avoiding the loss of force which is always incident to the use of it. Such a wheel is the Poncelet wheel, devised by M. Poncelet in 1824. This wheel, represented in fig. 79, is an undershot wheel, but, Fig. 79. unlike that in fig. 78, has curved palettes; the curves are tangents to the exterior rim of the wheel; the lower ele¬ ment of curvature is horizontal, the upper vertical. It is with boards so disposed that the work transmitted by the water to the wheel exceeds that given out by plain boards. 473. The course, till arriving at the lowest part of the wheel, is here inclined at about 1 in 10, so that the water might regain the velocity which it lost by the friction of the sides and bottom of the course: the inclination may be lessened, when the sheet of water is considerable that issues fiom under the flood-gate. The course also is uniform, and where it embraces the wheel is a little narrower than its breadth. In order that the wheel may work in a course nanower than itself, the lower parts of the upright sides of the course are hollowed out, so that the projecting curved boards of the wheel might w'ork in them. At the lowest pai t of the wheel the course is suddenly depressed, in order that the back-water might not affect the working of the machine. With respect to the head of water pent up behind the flood-gate, the latter is very much inclined, so that the sheet of escaping water might just issue with¬ out losing any of its velocity by the resistance of the course. 474. If we suppose that water is admitted by the open¬ ing on the curved boards, it will take a velocity, say V, and enter horizontally on the lower element of the curve. The water now glides along this curve, rises, and gradually, by the action of gravity, loses its velocity of entering, till, at the highest part of its course, V is lost altogether, that is, V2 when it has attained a height = 7-- = 0*051 met. x V2. The 2g water now begins to fall down the curve, and, acquiring an increased velocity as it reaches the horizontal or lowest part of the curve, quits the palette with the same velocity as it entered upon it. Let the uniform velocity of the perime¬ ter of the wheel be V, then V — V' is the relative velocity with which the water rises through the length of the curve, ,/v-vv and = 0*051 met. x (V - V)2 = the height to which it will rise on the curve; and at last, on quitting the horizontal part of the board, will have a velocity = V — V'. But the lower part of the curve works with a velocity V' in the opposite direction; .*. V — V'— V' = V — 2V'= the absolute velocity of the water as it leaves the wheel. If we wish to have a maximum effect, V — 2V' = 0, or V' = iy; that is to say, were the wheel to take one-half the velocity of the current on its arrival at the board, the absolute velocity of the water on quitting the boards would be nothing. Wherefore we have a current mover, experiencing nei¬ ther shock nor loss of velocity at the moment of its enter¬ ing on the wheel, and which possesses none at the moment of leaving it; the current then spends its whole motion, and communicates its whole force to the wheel. These two conditions suffice to produce the greatest possible effect. For this let W be the weight of fluid furnished by the cur¬ rent in 1 second, and h = height due to velocity, the effect will be expressed by WA. This is true for a single fillet, but not for a sheet of water of a definite thickness; for the mole¬ cules strike the boards at an angle more or less great with respect to the parts struck, and consequently there is a loss of force and velocity. This mass of water, when it quits the boards, does not move exactly in a direction opposite to the boards ; and again, since so much water is lost by every course, without producing any effect, the real effect will be something less than W/<. 475. M. Poncelet, in his Memoire sur les Roues Hydrau- hques Verticales a Aubes Courbes, mentions all the experi¬ ments which he made on this wheel. The practical results which Poncelet deduced from these experiments are—IaV. That the velocity of the wheel which gives a maximum effect is 0*55 of the velocity of the current; it may vary from 0*50 to 0*60. 2d. That the dynamical effect is not under 0*75 x W/t for small falls with large openings at the bottom of the flood-gate, and 0*65 for small openings and deep falls. 3<7. That this same effect, compared with the full force of the mover, is 0*60; and for small openings it will reach 0*50. 476. For the case which generally occurs in practice, when properly arranged wheels have a velocity not differ¬ ing much from 0*55 that of the current, we may take the dynamical effect - 0*75 x WA, and also = 0*60 x WH, the passive resistances being taken into account. H is the total fall of water. With an opening under the flood-gate of from 0*100 On Waten Wheels. 1 Essai sur la Construction des Roues Hydrauliques, etc., par M. Fabre. HYDRODYNAMICS. 167 On Water' Wheels. met. to 0-304 met., h will vary from 1-43 to I'26 met., and H from 1'59 met. to 1-52 met.; and the we.ght o water W, furnished by the current in 1 second, would be, foi the first onenino- 279 kilogr., and for the second 809 kilogr. The coefficient which multiplies the quantity WA, is fully double that obtained from wheels with plain palettes, which is sufficient to make us dispense with plain palette- wheels, and substitute for them wheels with curved Pal477S’ln the construction of these wheels with curved ..alettes—1^. The number of palettes will be double that required in wheels with plain palettes. 2d. Their height, m the direction of the radius, or the distance between the inner and outer circumference of the wheel, must be in ex¬ cess of a fourth of the effective fall: if the fall be 1 40 met. it will be a third of this; for falls under this last it will be a half ?>d The lower element of the curve, which makes an aneie nothing, or nearly so, with the outer circumference, will when the sheet of water is extremely thin, make an angle with it of 24°, 30°, and generally greater as the thickness of the moving sheet increases. The curves may be thus obtained:—From point A (fig. 79), where the fluid sheet BA meets the outer circumference, raise a vertical AK, and from point C, where it cuts the inner circumference, describe, from centre C, with radius CA, an arc AL ; an so on for all the others. And \th, Immediately under the vertical diameter, the bottom of the course must be sud¬ denly lowered, so that the back-water might not interrupt the working of the wheel. . , 478. The work done then by the water entering on the Poncelet wheel = work done on the wlieel + that done by the water on leaving the paddle, or = P + 2^(V -2V ^ P = ——(V - V') V ; 9 and we have seen that the work done by this wheel is nearly double that performed by the undershot wheel with plain palettes ; the value of P being as in art. 470. (8.) Overshot Wheels, or Bucket Wheels. 479. An overshot or bucket wheel is so disposed, that the water, as the motive power, is received on its upper part; it is represented in fig. 80, where ABC is the circumference of the wheel furnished with a number of buckets. The canal MN conveys the water into the second bucket from the ton Aa The equilibrium of the wheel is therefore On Water- destroyed r and the power of the bucket Au to turn the wheel round its centre of motion O, is the same as if the ' weight of the water in the bucket were suspended at w, theS extremity of the lever Om; c being the cen re of gravity of the bucket, and Om a perpendicular let fall from the fulcrum O to the direction cm, in which the force iS exerted. In consequence of this destruction of equdibnum the wheel will move round in the direction AB, the hue et Aa will be at d, and the empty bucket b will take the place of Aa, and receive water from the spout JN. Ihe torce acting on the wheel is now the water in the bucket d, act¬ ing with a lever nO, and the water in the bucket Aa act- in*-- with a lever mO. The velocity of the wheel will there¬ fore increase with the number of loaded buckets, and with their distance from the vertex of the wheel; tor the lever by which they tend to turn the wheel about its axis in¬ creases as the buckets approach to c, where their power, represented by eO, is a maximum. After the buckets have passed c, the lever by which they act gradually dimi¬ nishes, they lose by degrees a small portion of their water, and as soon as they reach P, it is completely discharged. When the wheel begins to move, its velocity will increase rapidly till the quadrant of buckets be is completely filled. While these buckets are descending through the infenoi quadrant eP, and the buckets on the left hand of b are re¬ ceiving water from the spout, the velocity of the wheel wd still increase; but the increments of velocity will be small¬ er and smaller, since the levers by which the inferior buck¬ ets act are gradually diminishing. As soon as the highest bucket Ac has reached the point B, where it is emptied, nearly the whole semi-circumference of the wheel is loaded with water; and when the bucket at B is discharging its contents, the bucket at A is filling, so that the load in the buckets, by which the wheel is impelled, will be always the same, and the velocity of the wheel will become uniform s 480. In order to determine the best form of the buckets, we must consider that the power of the wheel would be a maximum if the whole of its semi-circumference were loaded with water. This effect would be obtained if t e buckets had the shape shown in fig. 81, where ABC is the form of the bucket, AB being a continuation of the radius, and BC part of the circumference of the wheel, and nearly equal to AD. But as a small aperture at CE will neither admit nor discharge the water, the form shown in fig. 82 has been pro¬ posed by Sir David Brewster as / the best. In this construction, Fig-si. _ J^8/82, BC is made a little larger than BE, and AB is diminished so as to make the angle ABC a little greater than 90 . The angles at B should be rounded off, so as to make ABC a curve, as indicated by the dotted line. 1 he aperture at dE must be sufficient for the introduction and discharge of the water, and the side BE of the bucket should be as smooth and even as possible. . 481. The distance of one bucket from another is about one foot. But the wheel is sometimes divided into four parts, and a whole number of buckets placed in each, so that the number of buckets will be proportional to the diameter. In forming the buckets, the space e?E, fig. 82, must evidently be a little wider than the fluid sheet, so that the proper volume of water may be admitted. The angle also which the side AB makes with BE, is from 110 to 118°, according as the wheels are from about 13 39 feet in diameter; the angle then which BE makes with the circumference, is about 31°; it should never exceed 33°. The depth of the bucket is DE, where E is a point 168 HYDRODYNAMICS. On Water-of the circumference, fig. 81. AB is frequently taken as Wheels. a thirci 0f J)E, sometimes as a half. The buckets may receive water either by the method shown in fig. 80; or the water, without fall of any kind, may come in the oppo¬ site direction by a canal closed up at the end next the wheel, where one or two openings in the bottom of the course admit the water into the buckets. This principle is in very general use in Great Britain. 482. The breadth of the bucket is determined by the volume of water which it receives and carries. Let Q be the volume issuing in one second from the reservoir by which MN is supplied. V' the velocity of the circumference, d the distance, reckoned along AB (fig. 80), of one bucket from V' another; then in one second a number of buckets = — d will pass before the mouth of MN, and each will carry away a volume = Q divided by^-=^?. Now, in order to be effective, the bucket must not only carry this, but a volume three times greater. Let 1= the breadth of a bucket, s — the transverse section, then the capacity of the bucket or volume of water contained = s/. Now, let m be the num¬ ber of buckets on the wheel, and n the revolutions of the wheel in one minute, or 60 seconds; then as the volume si of water must be = 3Q^ = 180 ; for m. c7=circum- V m. 71 ference, and 60 . V' = w x circumference ; s/=I80.-^—; or /=180 . - Q = m. n m .n .s breadth of wheel given by the work. The volume Q is that which the wheel spends so as to produce its whole effect. 483. In the work performed by an overshot wheel, the mean vertical height h is nearly equal to the diameter of the wheel, and also V" = V', for the velocity of the water on leaving the paddle is the same as that of the paddle. P = WA + ^|2VV'-V'2-V'2 j = W |4+I(V_V')V'J . The latter member is to be multiplied by its coefficient. 484. Smeaton, in 1759, experimented on overshot wheels, and the principal results of his observations are—[st. That, relative to the effect produced, the fall should be divided into two parts; one equal to the diameter, the other a little above it. 2d. Since the action of the upper part of the fall is feeble, Smeaton sought a relation between the effect and the lower part of the fall ; this was constantly 0-80 x W x diameter. 3c?. When the fall exceeded the dia¬ meter by only a small quantity, he had 072 x W x total fall. And, 4^/i. That the velocity of a bucket-wheel should range from 3 feet to 6 feet per sec. In these observations he was guided mainly by the old principle, that a bucket- wheel gives most effect w’hen it turns slowly, as was shown in the experiments of Deparcieux. Smeaton also concluded, from a series of experiments, that the higher the wheel is in proportion to the whole descent, the greater will be the effect. water expended were the least; but that it was as four to On Water- two, when the height of the fall and the quantities dis- Wheels, charged were the greatest. By taking a mean between 's«— these ratios, we may conclude, in general, that in overshot wheels the power is to the effect as three to two. In this case the power is supposed to be computed from the whole height of the fall; because the water must be raised to that height in order to be in a condition of producing the same effect a second time. When the power of the water is esti¬ mated only from the height of the wheel, the ratio of the power to the effect was more constant, being nearly as five to four. According to Smeaton, the effect of a wheel driven in this manner is equal to the effect of an undershot wheel (458), whose head of water is equal to the differ¬ ence of level between the surface of water in the reservoir, and the point where it strikes the wheel, added to that of an overshot (479), whose height is equal to the difference of level between the point where it strikes the wheel and the level of the tail water. 485. We have hitherto supposed the float-boards, though inclined to the radius, to be perpendicular to the plane of the wheel. LTndershot wheels, however, have sometimes been constructed with float-boards inclined to the plane of the wheel. A wheel of this kind is represented in fig. 83, where AB is the wheel, and C, D, E, F, G, H, the oblique float-boards. The horizontal current MN is delivered on the float-boards, so as to strike them perpendicularly. On account of the size of the float-boards, every filament of the water contributes to turn the wheel ; and therefore its effect will be greater than in undershot wheels of the common form. Albert Euler imagines that the effect will be twice as great, and observes, that in order to produce such an Fig. 83. effect, the velocity of the centre of impression should be to the velocity of the water, as radius is to triple the sine of the angle by which the float-boards are inclined to the plane of the wheel. If this inclination, therefore, be 60°, the velocity of the wheel at the centre of impression ought to be to the velocity of the impelling fluid as 1 to —v^, that is, 2 as 5 to 13 nearly, because sin 60° = ^. When the incli¬ nation is 30°, the ratio of the velocities will be found to be as 2 to 3. Among other philosophers who have experimented on overshot wheels, we may mention the Chevalier D’Arcy, who showed that the less the velocity the greater is the effect produced; Borda, who showed that the maximum effect will be produced when the diameter equals the height of fall; and Bossut, Albert Euler, Lambert, Poncelet. Smea¬ ton also showed, that when the work performed was a maximum, the ratio of the power to the effect was as four to three, when the height of the fall and the quantities of SECTION II.—HORIZONTAL WHEELS, AXIS YERTICAL. (a.) Wheels receiving an isolated Vein. 486. Horizontal water-wheels have been much used on the Continent, and are strongly recommended to our notice by the simplicity of their construction. In fig. 84, AB is the large water-wheel which moves horizontally upon its HYDRODYNAMICS. 169 Horizontal arbor CD. This arbor passes through the immoveable mill¬ wheels. stone EF at D, and being fixed to the upper one GH, carries it once round for every revolution of the great wheel. The mill-course is construct¬ ed in the same manner for horizontal as for vertical E1""--1' wheels ; it must be circular and concentric with the rim of the wheel, sufficient room being left between it and the tips of the float-boards for tbe play of the wheel. In thisA construction, where the water moves in a horizontal direc¬ tion before it strikes the wheel, the float-boards should be inclined about 25° to the plane of the wheel, and the same number of degrees to the radius, so that the lowest and outermost sides of the float-boards may be farthest up the stream. (/?.) Tub or Spoon Wheels. 487. In many parts of the south of France, wheels are to be seen working in a cylindrical tub or hole of small depth, or into a conical hollow. Fig. 85 will show the nature of one of these wheels. It is constructed in the form of an inverted cone AB, with spiral palettes on its surface. The Fig. 84. when the machine was put in action, the effective work Horizontal produced was 0-80 that of the water. The surprise was Wheels, not diminished when it was found that the new wheel worked as well under as above water. Since their invention, tur¬ bines have been extensively adopted, especially in trance and Germany. c Fig. 85i wheel moves on a vertical axis AB, and is driven chiefly by the impulse of water conveyed by the canal C, and falling obliquely on the float-boards at the place of impact: the spent w’ater is carried away by the channel M in the solid walls D, D. But in the best constructed cylindrical tub- wheels the water issues from a canal in the walls, in a direc¬ tion tangential to the circumference. In thus impinging on the float-boards, it preserves its gyratory motion, and makes the wheel whirl round. The useful effect of these wheels is never above 0-25 of the work given by the water. >Sjp0Oft-wheels are so named because their narrow, yet long, radial curved palettes, have a shape like a spoon. (y.) Turbine of M. Fourneyron. 488. Within the last 30 years wheels with vertical axes have been so much improved, that now they rank among the most perfect hydraulic machines which exist. They are termed Turbines, and were invented in 1827 by a young French mechanician named Fourneyron. During that year, Fourneyron erected one a few inches in diameter, of six horse-power, in Franche-Compte. To the surprise of all, VOL. XII. Fig. 86. 489. A turbine consists of three principal parts ; the tur¬ bine proper DD (fig. 86), with its axis FF ; the cylinder wCCy, with its bottom CC and the apparatus mn which carries it; and the cylindrical flood-gate aa. The whole ap¬ paratus is made of metal. Turbines are of two kinds —those which work below, and those which work above, the surface of the water. 490. With respect to the first kind, or those immersed in water, in fig. 86 we have A A the upper or supplying canal, the water from which enters freely the cylinder BB, and finding no way of escape save by the circular lateral open¬ ing CC, issues by it and precipitates itself in every direc¬ tion in a sheet upon the palette boards of the circular wheel DD. It thus puts the wheel in motion, and then loses it¬ self in the lower water-course. The wheel DD is annular, and disposed horizontally all round the opening CC, such that the fluid sheet might impinge upon it. We shall have a proper idea of the disposition of the wheel DD if the Poncelet wheel, instead of working vertically, work hori¬ zontally ; we have a section of it, however, in fig. 87. A kind of metal cap EE, binds the wheel to the central re¬ volving axis FF, passing freely through a pipe in the mid¬ dle of the cylinder. The wheel DD is in the present case wholly immersed in the lower water-course, the level of which is GG. The axial beam FF of the machine is ter¬ minated at its lower part by a pivot resting on a point of a lever HK, of which the fulcrum is K. A rod L is jointed to H the extremity of the lever, and the end of that rod works into a nut; on turning the nut, we may raise or lower at pleasure the axial beam, and therefore also the wheel which it carries, so that the latter may be brought exactly in opposition to the circular opening of the cylinder in order to receive the due supply of water. Fig. 87. Y 170 Horizontal Wheels. HYDRODYNAMICS. Although the wheel is immersed in the lower water-course, yet this does not prevent the water of the higher couise, i.e., of the cylinder, from passing through the opening CC, and acting on the boards of the wheel, the flow being due to the difference of the levels of the two water-courses. Again, there must be some arrangement within the cylin¬ drical reservoir, so that the water which flows in may flow out in a uniform equable sheet; if this were not attended to, the escape would take place at different points, and would therefore be irregular; and, further, the water would not strike the boards of the wheel in the most effective manner. In order, therefore, to obviate this irregularity of the flow, M. Fourneyron disposed within the cylinder curved upright partitions B, as in fig. 87, which is the projection of the in¬ terior of the cylinder on its bottom ; at a small distance from this, and disconnected with it, is the working wheel D, with its curved boards disposed opposite to the curved partitions of B. The water enters and fills the chambers of B, and the consequence is, that the water, on issuing from the reservoir, moves everywhere obliquely to the surface of the same, encounters the boards of the wheel which offer an opposition to its motion, and exercises on the palettes, pressures which tend to turn the wheel in the direction of the arrow. Within the reservoir is a cylindrical flood-gate aa (fig. 86), which serves to widen or narrow the circular opening CC. This is done by raising or lowering the ver¬ tical rods b, b, their upper parts working into nuts which may be turned at pleasure, The flood-gate aa is of consider¬ able thickness, and round, so as to widen the orifice of escape. It would appear that the curved boards of the wheels presenting their surfaces nearly perpendicularly to the issu¬ ing water, ought to receive a shock from part of the liquid, but this entirely disappears when the wheel is moving in a proper manner. It must be observed, however, that these boards moving round a centre, are differently circumstanced than if they had been at rest. Whenever the water issues out of the reservoir it strikes on the boards, but no sooner does this take place than the wheel flies before the water; the palette boards are only acted upon in virtue of the relative velocity which the water possesses with respect to the boards. Now the boards are so disposed, that when the turbine assumes the velocity that it ought to take, the relative velo¬ city of the water with respect to the wheel is directed tan¬ gentially to its inner edge; the result is that the water enters on the wheel without producing any shock. The water moves along the whole length of the wheel boards, entering at the inner and passing out by the exterior part of the board, and exercising a pressure at every point, whereby the velocity is constantly changing its direction. The water also, on leaving the wheel, leaves it with a relative velocity, and moves in a direction contrary to that of the boards. It is possible, then, that the turbine may be made to have a motion such that the velocity of the exterior cir¬ cumference may be precisely the same as the relative velo¬ city of the water. If this condition be fulfilled, the water, on its leaving the wheel, will only be animated by an insen¬ sible motion, and will thus become associated with that in the midst of which the wheel is plunged: the water will thus be deposited, so to speak, without velocity from the boards, which fly away without being retarded. We see also that the water, acting at the same time on all the boards of the wheel, produces on these, horizontal pressures which tend in no ways to throw the axis of the wheel to one side or another; the consequence of which will be that the pressures cause no friction of the beam on its pivot, nor on the bodies which touch it at different parts of its height, and which tend to keep it in an exact vertical position. These conditions, which no wheel with axis hori¬ zontal can fulfil, enables the turbine to give results far more valuable than those of Poncelet’s wheel. From the various experiments which have been made on Horizontal turbines, the greatest amount of work done equals O'To, and heels, in some cases 0*85 of that expended by the water. 491. The Fourneyron turbine has several advantages of the most valuable kind. It may work when immersed, as we have seen, in the middle of the lower course, and thus dis¬ posed, it operates during the time of floods as well as when the water is very low, for otherwise it would be disturbed by the greater or lesser height of the level of the water in the lower course; the total height of fall is also rendered useful, which could not be the case were the wheel to be placed above the level of the lower water-course; and that the machine can work during hard frost, since the water sel¬ dom freezes in a rapid running stream. Another advantage which this machine has, consists in this, that we may make its velocity vary within sufficiently extensive limits, by means of the velocity which corresponds to the maximum effect, without which the ratio of work done to the work which the quantity of water expended represents, would diminish very much. This result is of great importance for the case in which a turbine ought to move with a uniform velocity, and where the height of the falling water varies. But the velocity of a turbine which corresponds to the maximum effect, depends on the height of the fall; it aug¬ ments or diminishes according to this height. If a turbine move always with the same velocity under different heights of fall, it will not have a constant velocity capable of pro¬ ducing the maximum effect. It is then a very important matter that the machine, acting with a velocity different from the particular velocity, should furnish results nearly equal to the maximum effect. The turbine may be adapted for all sorts of fall, provided that we adapt it to'the quantity of water, more or less great, which ought to act upon it, and to the rapidity of motion which it ought to take, We have an idea of the value of a properly constructed turbine, when one erected in 1837 by M. Fourneyron, at St Blaisq, in the^Black Forest of Baden, moved by a column of water 1 feet, did work equivalent to 56 horse-power, and gave a useful effect of between 0-70 and 0*75 of that of the water ; the wheel, to¬ gether with the cylinder, which is 20 inches in diameter, weighedonly 1051bs. An¬ other at the same place has a fall of 354 feet; the dia¬ meter of the wheel is 13 inches ; it expends a vol¬ ume nearly of 1 cubic foot per second, and makes from 2200 to 2300 revolu¬ tions per minute; its use¬ ful effect is from 80 to 85 per cent, of the work derived by the water, This machine sets in mo¬ tion 8000 water spindles, with roving, carding en? gines, cleansers, &c. A turbine erected at Gisors, under a fall of 3*7 feet, utilized 0’75 the work of the fall. When the fall was 2 feet, the useful work was 66 per cent, of the fall, and when the fall was I'll feet, it was 60 per cent. 492. The second kind of turbines, or those which work out of the water, Fig. 88. 7 is represented in fig. 88, where B is the entire cylinder ; C is that part of it which joins on to the supplying pipe D, conveying the water from an ele- H Y D R O D "5 Horizontal vated reservoir or canal; AA is the turbine or wheel; o, Wheels. js t}ie circu]ar flood-gate, which may be lowered or elevated by the rods b,b. .. . . ^ 493. With all the advantages, however, which the hour- neyrori turbine has, there is one thing which causes so much loss of work in the machine ; the sheet of water issuing from the circular opening at the lower side of the reservoir, has a thickness more or less great, according to the contraction of the flood-gate ; on this account the water does not always fill the wheel in its whole height. The upper part of the space comprised between the boards of the wheel is not, however, empty; but the water there does not possess the same velocity as that issuing from the reservoir ; this occa¬ sions eddies, accompanied by a loss of velocity, which must therefore produce a diminution of useful effect. It was to remedy this waste that Fourneyron divided his wheel into several compartments, by means of horizontal partitions. But these partitions do not recover the whole, though a part, of the loss to the machine. M. Gallon endeavoured, by the following method, to re¬ store the full effect of the machine. To this end he sub¬ stituted for the single circular flood-gate within the reser¬ voir of Fourneyron, a considerable number of partial flood¬ gates, all touching each other, and placed around the inside of the cylinder, several being open that the water might issue upon the wheel. By this means, the quantity of water flowing from the reservoir may be diminished without di¬ minishing the thickness of the sheet; those of the flood¬ gates which are open and shut being uniformly distributed around the circumference. The disadvantage of Fourney- ron’s turbine is thus removed, but another is originated in the fact, that the different portions of the wheel are carried round successively before the open and before the shut flood-gates. At the time when the interval of two boards comes opposite a shut gate, the water which is there con¬ tained, and which has a considerable velocity, will only con¬ tinue to move on producing a void behind it, which will necessarily occasion a sharp diminution in its velocity, and, therefore, also will entail a loss of work. 494. Fontaine's turbine differs from that of Fourneyron’s in having the circular opening not in the side near the bot¬ tom, as in the latter, but in the bottom of the cylinder it¬ self, with the wheel right under the same. The circular opening is not wholly open, but it consists of a considera- able number of distinct orifices, each of which is furnished with a special flood-gate, by the aid of which the orifice may be more or less shut. This disposition of the machine does away in great part with the loss which takes place in Fourneyron’s turbine. 495. The turbines which have been mentioned hitherto are difficult to repair, both when immersed, and when at a small distance above the lower water-course. 1 he method of doing so is by raising a strong temporary barricade around the turbine, and pumping the wrater out so as to isolate it, the cylinder remaining full, while the flood-gate is firmly secured to prevent escape. But this method is inconvenient. A turbine, therefore, was invented by M. Jonval, and con¬ structed and improved by M. Koechlin for the special pur¬ pose of remedying this inconvenience. Koechlin’s turbine is somewhat peculiar. Let us suppose a hollow vertical cylinder open at both ends, and the upper and lower water¬ courses communicating with each other by means of this cylinder; the water which passes through this cylinder may be rendered useful by placing a turbine wheel within it, and at any part of its height; provided only that the water, on leaving the wheel, and traversing afterwards that portion of the cylinder lying between the bottom of the wheel and the surface of the lower water-course, is not in direct con¬ tact with the atmosphere till it arrives at the surface of the lower water-course. Now, it is clear that if the turbine be placed too high in the cylinder, the difference of level be- r N A M I C S. 171 tween the upper course and the wheel will be small, and so Horizontal much force will be lost; but to make up for the loss, a gain Wheels, is effected by the drawing or sucking, which takes place V''— in the lower part of the cylinder under the wheel; this draw¬ ing effect being, very curiously, greatest when the wheel is highest above the surface of the lower water-course. \\ e see, then, that the position which the machine now has, al¬ lows a workman to enter the cylinder from below, and re¬ pair the wheel. For an account of the best observations and experiments on the turbine, see Morin’s Experiences sur les Roues Hy- drauliques Appelees Turbines, 1838 ; Comptes Rendus, for July 1838; and the Notice on Vortex Water-Wheels in the British Association Reports for 1852. (S.) Wheels with Passages. 496. Under wheels of this kind we may mention the Danaide of M. Manouri d’Ectot. The principal piece of this machine is a tun or small tub of white iron, having a hole pierced in its bottom, through which passes the axis of rotation, and by which the water escapes. The axis turns with the trough upon a pivot, and is fixed above to a collar. A drum of tin plate, closed above and below, is fixed upon the axis of, and placed within the trough, so as to be con¬ centric with it, and to leave only between the outer circum¬ ference of the drum and the inner circumference of the trough, an annular space not exceeding 1£ inches. This annular space communicates with a space less than 1^ inches, left between the bottom of the drum and the bot¬ tom of the trough, and divided into compartments by dia¬ phragms fixed upon the bottom of the trough, and proceed¬ ing from the circumference to the central hole in the bot¬ tom of the trough. The water comes from a reservoir above by one or two pipes, and makes its way into this annular space between the trough and drum. The bottom of these pipes corre¬ sponds with the level of the water in the trough, and they are directed horizontally, and as tangents to the mean cir¬ cumference between that of the trough and of the drum. The velocity which the water has acquired by its fall along these pipes, makes the machine move round its axis, and this motion accelerates by degrees, till the velocity of the water in the space between the trough and drum equals that of the water from the reservoir; so that no sensible shock is perceived of the affluent water upon that which is contained in the machine. This circular motion communicates to the w7ater between the trough and drum a centrifugal force, in consequence of which it presses against the sides of the trough. This cen¬ trifugal force acts equally upon the water contained in the compartments at the bottom of the trough, but it acts less and less as this water approaches the centre. The whole water, then, is animated by two opposite forces, viz., gravity, and the centrifugal force. The first tends to make the water run out at the hole at the bottom of the trough; the second, to drive the wrater from that hole. To these two forces are joined a third, viz., friction, which acts here an important and singular part, as it pro¬ motes the efficacy of the machine, while in other machines it always diminishes that efficacy. Here, on the contrary, the effect wTould be nothing were it not for the friction, which acts as a tangent to the sides of the trough and drum. By the combination of these three forces, there ought to result a more or less rapid flow from the hole at the bottom of the trough ; and the less force the water has as it issues out, the more it will have employed in moving the machine, and of course in producing the useful effect for which it is destined. 172 HYDRODYNAMICS. Horizontal The moving power is the weight of the water running in Wheels, multiplied by the height of the reservoir frorn which it flows above the bottom of the trough ; and the useful effect is the same product diminished by half the force which the water retains when it issues out of the orifice below. In order to ascertain, by direct experiment, the magnitude of this effect, MM. Prony and Carnot fixed a cord to the axis of the machine, which passing over a pulley, raised a weight by the motion of the machine. By this means, the effect was found to be /sths of the power, and often approached without reckoning the friction of the pulleys, which has no¬ thing to do with the machine. This effect exceeds that of the best overshot wheels. See the Report of the Institute, 23d August 1813; ox Thomson's Annals of Philosophy, vol. ii., p. 412. M. Burdin, in 1833, invented a Danaide with axis ver¬ tical, which may be seen described in the Annales des Mines for 1836. D’Ectot’s may be seen in the Journal des Mines, tom. 34. (e.) Reacting Machines, or Wheels of Recoil. 497. We have hitherto considered the mechanical effects of water as the impelling power of machinery, when it acts either by its impulse or by its gravity. The reaction of water may be employed to communicate motion to ma¬ chinery ; and it is believed that a given quantity of water, falling through a given height, will produce greater eftects by its reaction than by its impulse or its weight. Barker's Mill, or the Wheel of Recoil. 498 This machine, which is sometimes called Parent’s mill, is represented in fig. 89, where MN is the canal that conveys the water into the upright tube TT, which com¬ municates with the horizon¬ tal arm AB. The water will therefore descend through the upright tube into this arm, and will exert upon the inside of it a pressure pro¬ portioned to the height of the fall. But if two orifices, A and B, be perforated at the extremities of the arm, and on contrary sides, the pressure upon these orifices will be removed by the efflux of the water, and the unbalanced pressure upon the opposite sides of the arm will make the tube and the horizontal arm revolve upon the spindle D as an axis. This will be more easily un Fig. 89. derstood, if we suppose the orifices to be shut tip, and con¬ sider the pressure upon a circular inch of the arm opposite to the orifice, the orifice being of the same size. I he pressure upon this circular inch will be equal to a cylinder of water whose base is one inch in diameter, and whose altitude is the height of the fall; and the same force is exerted upon the shut-up orifice. These two pressures, therefore, being equal and opposite, the arm A will re¬ main at rest. But as soon as the orifice is opened, the water will issue with a velocity due to the height of the fall; the pressure upon the orifice will of consequence be removed; and as the pressure upon the circular inch op¬ posite to the orifice still continues, the equilibrium will be destroyed, the arm will move in a retrograde direction. 499. The upright spindle D, on which the arm revolves, Horizontal is fixed in the bottom of the arm, and screwed to it below Wheels, by a nut. It is fixed to the upright tube by two cross bars, so as to move along with it. If a corn-mill is to be driven, the top of the spindle is fixed into the upper millstone nu The lower quiescent millstone n rests upon the floor K, in which is a hole, to let the meal pass into a trough below. The bridgetree ah, which supports the millstone tube, &c\, is moveable on a pin at a, and its other end is supported by an iron rod fixed into it, the top of the rod going through the fixed bracket O, furnished with a nut c. By screwing this nut, the millstone may be raised or lowered at pleasure. If any other kind of machinery is to be driven, the spindle D must be prolonged above the hopper H, and a small wheel fixed to its extremity, which will communicate its motion to any species of mechanism. 500. Barker’s Mill, or Segner’s Wheel, as it is sometimes called, has not been extensively used in moving machinery, owing chiefly to the lower pivot D being made to bear the whole weight of the water in the cylinder, besides the weight of the apparatus. The considerable resistance, however, arising from this cause has been ingeniously set aside by Althans of Sayn, who has so arranged the machine that the water enters the horizontal cylinder D T from below. Such a mill may be had by removing the apparatus HK, the hori¬ zontal cylinder AB being above, and N T below. But in such an arrangement, the upright cylinder T 1 is now stable, and AB only rotates round a pivot, and the friction also is very much reduced, the weight of the wheel, and all that is fastened to it, being entirely supported by the column of water. An advantage is derived by having a rotating cylin¬ der similar to an S, placed thus c/2; for water issuing fiom the orifices of a straight cylinder issues from it with a cer¬ tain velocity, but in passing through a cylinder with curved arms, it gradually loses its impetus, till at last it falls from the orifices with no velocity whatever. In several parts of Scotland these Barker s mills are known as Scotch Turbines. (£.) Albert Euler's Reacting Machine. 501. This machine was first described in the Memoires^ de l'Academic de Berlin for the year 1/54: it consists ot two parts, GH the upper (fig. 90), and EF the lower. The upper portion is immoveable, and forms a cylindrical and annular reservoir, receiving w'ater within the annulus PP, from the canal R; at its low'er part I, I, are a set of straight pipes, but inclined at an angle determined by calculation, so that the water may descend with proper ob¬ liquity into the lower vessel. These pipes are represented by the lines I i. The lower part is moveable round theF common axis 00, and has also an annular trough EE, from the bottom of which, in¬ side the vessel, pipes descend and discharge from a rectangular end F, the water which passes through them. The velocity with which the water issues is that due to the height EF ; and a rotary and re¬ trograde motion takes place in the lower half of the machine. M. Burdin gives an account of a reacting turbine o us own invention, along with his experiments on it, m the Annales des Mines for 1828. Fig. 90. 173 HYDRODYNAMICS. CHAPTER IL—MACHINES HAYING AN ALTERNATE MOTION. Machines 502. The second kind of wheels which we come to de¬ having an scribe, are those having an alternate motion; ot these, two Alternate on]y are known in the arts,—the Water-column Machine, Motion. an(j jy[ontgolJier’s Hydraulic Ram. (a.) Water-column Machines. 503. The water-column machine consists of a cylinder or great body of a pump, in which a piston is driven back¬ wards and forwards by the weight of a high column of water contained in an upright pipe. To the piston-rod is adapted a working beam, which transmits a motion to the common pumps; sometimes also the up and down motion is transformed into a motion of rotation. The first ma¬ chines of this kind were constructed in 1745 by Haell, and were known as Hall Machines. They were used at that time in the mines of Hungary, and in different parts of Germany; but were not very effective. It was only about 1817 that Reichenbach made them what they now are. One of these engines, as improved by him, was constructed at Illsang, which raised a column of salt water to a height of lldS'G feet. One of the best of these machines is that which works at a depth of 410 feet below the surface in the mines of Huelgoat, in Bretagne, a description of which, by M. Junker the engineer, is given in the Annales des Mines, 1835 ; and in M. Theodore Fischer’s Handhuch der Hydraulik, 1835. (/?.) Whitehurst's Machine, and the Hydraulic Ram. 504. Mr Whitehurst gives, in the Phil. Trans. 1775, an account of a machine for raising water to a considerable height by means of its momentum. This machine con¬ Fig. 91. sisted of a reservoir AM, (fig. 91), having its surface M on a level with the bottom of another reservoir BN. The main AE is about 200 yards long; and F is 16 feet below MB, The valve-box D has a valve a, and into the air-vessel C are inserted the extremities mn of the main pipe, bent down¬ wards to prevent the air being driven out when the water is forced into it. Now, from the distance of F below MB, as soon as the cock F is opened, a column of water 200 yards long is put in motion ; and if the cock F be suddenly shut, the water rushes through the valve a and condenses the air in C. Since this condensation of the air must take place every time that F is suddenly stopped, the air in C will react on the water and force it up into the reservoir BN, by the pipe CB. 505. The Hydraulic Ram of Montgolfier is based on this same principle. Although this engine is evidently an improvement on Whitehurst's Machine, yet Montgolfier afterwards claimed the entire merit of the invention.1 The pipe A, or body of the Ram, conveys water from an elevated reservoir, not represented in fig. 92, to the work¬ ing part of the machine, or head of the Ram. This head consists of the short pipe at B, opening upwards, where B Machines is a valve connected with a kind of stirrup surmounting the having an Fig. 92. opening. When B is at its highest, the water enters the air-vessel C, and is forced from it into an outer air-vessel F, whence it is expelled into the ascension pipe G to the required height. Suppose now, that the water is moving along the pipe A, and that B is at its lowest; then as B is in its way, and as it has no passage except by the circular sides of B, the valve B will be thus gradually forced upwards, till at last the water cannot escape by this opening. The head of waiter is now forced along the pipe with an increased velocity, exerting a pressure on the walls, and escaping by the valves E, E, the only yielding parts; a volume will there¬ fore be poured into the vessel F, which, by the condensa¬ tion of the air, will be forced up the ascension pipe G. When the valves E, E open, the velocity of the water in A immediately diminishes, and after a very short time, these valves close, for the water has now lost all its impetus. B also, which is no longer pressed upward, gradually falls to its original position, and then prepares anew for a second stroke. The pressure of the air in C plays a very important part in the machine. When the water is sharply arrested from escaping, by the valve B closing, it produces a violent shock, in virtue of which the valves E, E open so as to admit water into the vessel F. But the air in C meeting this shock, produces the greatest amount of work ; and when, by the agency of the air in C, the water has lost all its velocity, this air, in virtue of its elasticity, repels the water back into the pipe A. The valves E, E will then shut as soon as the pressure of the air and water of F inwards on E, E exceeds that outward pressure of C on E, E. The backward motion also of the water, in consequence of its acquired velocity, continues even though the pressure has been reduced to that due to the height of the fall; that is to say, although the pressure in C is less than that of the atmosphere, the water continues to move backwards in the pipe A. It is owing to this interior sucking that the valve B falls to prepare for a second stroke. The air again in the vessel F has also to play an im¬ portant part. It is of use in maintaining a uniform and continuous motion in the ascension of the water by the pipe G. When the valves E, E open, the water entering, compresses the air in F, but is not itself immediately forced up the pipe G, as it would be were there no air in F. The suppression of the air, therefore, in F, would require a greater force to raise a high column of water from a state 1 See the Journal des Mines, vol. xiii., No. 73. 174 HYDRODYNAMICS. Machines of rest, and the valves E, E would remain open a shorter having an time at each stroke of the ram; and, consequently, also, Alternate WOuld throw in a smaller volume of water. Motion. jt jg ^^58^ therefore, that the air in the vessels C and F be carefully supplied. Each volume of water, no doubt, brings along with it so much air; but as each is ex¬ pelled, more air is carried out than is introduced. A small pipe H, then, havinga valve opening inwards, and right under E, throws in a volume of air at the time when the back¬ ward motion of the water is taking place in pipe A, the pressure of the rarified air in C being less than that of the atmosphere. The vessel C being now full of air, then as soon as a new stroke of the ram takes place, the valves E, E open and introduce a volume of air into F. The water which passes over the valve B is conveyed away by the channel D. 506. The effect in this machine is the water raised a cer- Machines tain height during a certain given time. Let p = the h^ving an weight and h = height to which the water is raised, the A^t®I?ate effect will be measured by ph. Let P be the correspond- v ing force or weight of water furnished in the same time, and H = the height of the fall, the value of this effect = PH. Let also q — volume of water raised, and Q = volume of waste. /. Since Q : <7 = P : ja, we have ph PH qh QH the ratio of the volume raised to that used. This effect at a maximum is between 60 and 66 per cent, of the volume employed. The number of pulsations or strokes vary from 50 to 70 per minute. CHAPTER HI.—MACHINES FOR RAISING WATER. 507. Themachinesfor raising water are—(a.) Pumps; (/3.) Screw of Archimedes ; and, (y-) Pail or Bucket Machines. (a.) Pumps. 508. Pumps have for their object the raising of water to any height. A pump consists of a cylinder or body of the pump, in which an upward and downward movement takes place by means of a cork or piston, which is closely fitted to the walls of the cylinder. By the intervention of valves, a communication is established between the cylinder and the various pipes necessary for the throw of the pump. There are two pipes especially to be attended to ; the lower is the sucking pipe, the upper is the forcing pipe. Pumps are divided into three classes, and named accord¬ ing to the circumstances in which the piston acts,—(a.) Suck¬ ing Pumps. (b.) Forcing Pumps, {c.) Sucking and Forcing Pumps. (a.) 1. The Sucking Pump. 509. The common sucking pump consists of the cylinder DCCD (fig. 93), and the suction pipe BAAB of smaller diameter. These two parts are united by flan-^ ges E, F, tightened by bolts C, C. The level of the water in which the pump is plunged is ZY, and A A has a grating across it to prevent filth from entering the pump. OPM is a conical air-tight piston, and A' its rod; the mouth-piece, by which the water issues, may be at V or at X. The valves opening upwards are H and N : and R joins piston and rod. In order to explain the action of the common pump, suppose that the pis¬ ton is at the top of the barrel, or at TS, then the top of the piston-rod is at its highest; let also the valves H and N be shut. Now, as the piston- rod A descends, there is a tendency of the air within the barrel to be compressed; the valve N must ne¬ cessarily fly open upward, whereby the air escapes. When the piston M has reached GE, or the bottom of the cylinder, the valves are closed and a volume of air has escaped by N equal to the capacity of the bar¬ rel. Were the valve H permanently fixed, and were the piston to rise, then a vacuum would be formed between H and the bottom of the piston; but as H is hinged, immediately on M rising, the elastic force of the air between H and YZ forces up that valve, and the cylinder will now be filled with rarified air from pipe B, when the piston is again at the top. Let the piston redescend, and that volume of air will also be ex¬ pelled, and so on. But it is clear, that as more and more air is withdrawn, the pressure of the rarified air is less and less able to balance the atmospheric pressure on the surface YZ of the water, and the elastic force being proportional to the density, the water will rush up and fill the barrel. Suppose now that the air is completely exhausted, and that M as well as the water is at H ; then on M rising to D, the atmospheric pressure at YZ will force the water from the suction pipe into the barrel so as to fill it; but on M descending, since it cannot penetrate without displacing the water, the valve H must close, and N open, so that the whole volume of water which was below will now be above M. As the piston is again raised it will turn all the volume of water above it into the reservoir VX, so that it may be emptied by a mouth-piece in the side ; the barrel is again filled, however, and must be discharged as before. This is the action of the common suction pump. Before the time of Galileo, or rather before Torricelli showed ex¬ perimentally the pressure of the atmosphere, it was believed that the water was sucked up in the pipe HA, owing to the abhorrence of nature to a vacuum. But as Torricelli showed that an atmospheric column, extending through the whole height of the atmosphere, would balance a column of water 32 feet high of the same sectional area, it follows that, in order to raise water by the common pump, the valve H must on no account be more than 32 feet above the surface YZ of the water. If it exceed that height no water will be raised. With respect to the pressures which the faces of the pis¬ ton experience, we see that on M descending, when the barrel is full, the pressure on the upper and lower face is not exactly the same, for the faces are not of the same depth, and the water is slightly resisted while passing through the valve H, which shows us that this opening should be as large as possible. As the difference, however, is excessively small, the piston may be regarded as having no resistance to overcome in passing from D to C. It is otherwise when the piston is rising. It then acts as a full piston, and has to support different pressures on its two faces. . The upper face supports the atmospheric and the fluid column, while the lower face is only pressed by the atmosphere, less a fluid column extending from the bottom of the piston to the level YZ of the water. The difference of these pressures may be regarded as the pres¬ sure of a fluid column, having a section of the piston for its base, and its depth the vertical distance between the mouth-piece, say V and YZ. The descent and ascent of the piston constitute one stroke of the pump. 510. In the common pump, let A = area of piston ; 1= length of stroke ; h = vertical height of the bottom of the H Y D R 0 D Y Machines barrel above the surface of the water to be raised; // = A + /= for Raising vertical height of the pipe by which the water is discharged Water. from the water to be raised ; = the weight of a cubic loot of water; P = the work applied at each double stroke; m — the ratio of the work dong to the work applied, or the relative efficiency of the pump. Then work in raising water into the barrel (A + J/), and work in raising water from the barrels Mw . L Total work = Alw (A + ^ + Alio I— Ahv .(h + l); , r/iP hence mV = Alio (h + l) = Ahoh', and 1= r-p—• v Anw 2. Self’s Pump, with Suction Air Chamber. 511. In the agricultural department of the Great Exhi¬ bition of 1851, Mr Self exhibited a pump with suction air chamber. The peculiarity in the construction of this pump consists in its having an air chamber connected with a com¬ mon suction pump, the air chamber communicating with the suction pipe immediately below the barrel. When work¬ ing the common pump, a sudden jerk given at the begin¬ ning of the stroke, sometimes separates the piston from the water in the barrel, causing a vacuum into which the air will find its way. Selfs suction chamber is an arrangement calculated to remedy the defect, and save the labour accu¬ mulated in the water. Professor Mosely, in his report, says of this machine;—“ It is immaterial in what proportions the work is distributed over the stroke, or under what vary¬ ing degrees of pressure it is generated, provided that the pressure nev£r exceeds that of the atmosphere on the sur¬ face of the piston. If this pressure be exceeded, the piston may separate itself from the water beneath it in the barrel, the pump drawing air ; and this is more likely to occur at the commencement than at any other period of the stroke, the motion of the water at that point being necessarily slow. To communicate a finite velocity to the water at the commencement of the stroke, or while the space described by the piston is still exceedingly small, requires a much greater pressure than afterwards; and the greater, as the section of the suction pipe is less as compared with that of the barrel, and as the lift is greater, Thus, at the com¬ mencement of the stroke, a finite velocity of the piston can only be obtained by an extraordinary effort of the mo¬ tive power associated with the chance of drawing air and of a shock, if the pressure be suddenly applied. A remedy for some of these evils in the working of a pump has been sought in the application to it of a second air vessel, comr municating with the suction pipe immediately below the barrel, or with the top of the suction pipe and the bottom of the barrel. The commencement of each stroke is eased by a supply of water from this air chamber to the space be¬ neath it. The influx of the water into that space is aided by the pressure of the condensed air in the air chamber, and when the stroke is completed, the state of the conden¬ sation of this air is, by the momentum of the water in the suction pipe, restored, causing it to rush through the pas¬ sage by which that pipe communicates with the air cham¬ ber. Thus, by this contrivance, the surplus work which remains in the water of the suction pipe at the conclusion of each stroke, is stored up in the compressed air of the air- chamber, and helps to begin the next stroke of the piston. The nature of this action will be best understood from that of the hydraulic ram (505). The contrivance consti¬ tutes, indeed, in some respects, a union of the action of the ram with that of the pump ; and, besides accomplish¬ ing the object for which it was applied, appears to have the effect of considerably economizing the power employed in working pumps.1 N A M I C S. 175 3. The Lifting Pump. Machines for Raising 512. The object of the lifting pump is to raise water to Water. greater height than the common sucking pump can do. It is therefore nothing else than the common pump a little modified. ACDB (fig. 94) is the working barrel of the pump, with a side pipe AEGHF flanged, and ter¬ minating in a main or rising pipe IK, with a valve L, The top of the barrel is now shut by a strong plate MN; the piston rod Q works through the water¬ tight part OP. The piston valve is ft; the barrel and suction pipe are firmly bolted at D, C, and XV is the level of the water. The water first of all passes through the sucking valve T, opens the piston valve R, and fills the barrel BC; then when the piston- rod is drawn up, the water is neces-: sarily lifted and driven through the forcing valve L into the escape pipe IK. The action of the lifting pump is very simple. Suppose that the piston R is at T, that all the valves are shut, and that the air in the barrel and suction pipe is highly rarified, then immediately on the piston rod Q rising, the suction valve T will be forced open by the upward pressure of the water, and the piston valve R will necessarily be closed, for it drives out the remaining air from the barrel; conse¬ quently the valve L will keep open. When the piston R has reached NM, the water has entirely filled the barrel, and the valve L is shut by the atmospheric pressure. Again, when the piston rod descends, the valve R opens and T shuts; and when R is again at T, having completed one stroke, all the water will be above the piston and fill the barrel. Hence, on R being a second time pulled up, it has now to lift a weight equal to a fluid column BC, together with the atmospheric column in pipe IK, for the valve L is pushed open; on R reaching AB, a volume of water has been sent into the pipe IK equal to that which filled the barrel. But the barrel BC is again filled, and when the piston R descends, the fluid column in IK shuts L, the piston valve R opens and T shuts. When the piston R rises a third time, it has now to lift the water in the barrel, to¬ gether with that in the pipe IK ; and hence it is clear that water may be raised to any height, provided only that the barrel be strong enough to sustain the weight of the super¬ incumbent column in IK,—which must be raised before the valve L can open,—and the force necessary to work the common suction pump. The distance of DC from XV must not exceed 32 feet, but IK may be of any length. The piston rod is always drawn upwards, and consequently the rod Q is subjected to a longitudinal strain. A slim rod will suffice for this pur¬ pose, since there is no compressing force. The whole force which has to be overcome by the working lever or handle of the machine is,—1st, the weight of a fluid column extend¬ ing from the level XV to the level of water in pipe IK, the base being that of the piston, a weight which acts at the piston rod where it joins the short arm of the handle ; and, 2d, the passive resistances caused by the motion of the water and of the solid walls of the pump. Sometimes a small pipe (furnished with a cock) projects from the side of IK. When the pump is in action, and if 1 Mosely’s Report. CBraar.-.i i 176 HYDRODYNAMICS. Machines the cock be turned, the water will escape by the small pipe, or Raising so that in this condition the lifting pump becomes a com- Water. mon pUtnp. (b.) 1. The Forcing Pump. 513. The Forcing pump consists of a working bariel* ABCD (fig. 95), a suction pipe o CDEF, and an ascension pipe, ONML. The part GHKI may be said to belong to the barrel; the second part IKLM is united to it, and the part LMNO is pro¬ perly the ascension pipe. The clack or forcing valve is S, and m RN is the suction valve. The object of the forcing pump is to raise water to a greater eleva¬ tion than can be obtained by either of the former pumps. In the forcing pump the barrel AB is open to the atmosphere, the piston QVT is solid, and Q is a strong rod of iron. Suppose that the piston is being pushed down to R, then the valve S opens, and a volume of air equal to the capacity of the bar¬ rel is expelled by ON ; let VT now rise, and R, which before was kept shut by the pressure, opens; S also shuts, and a vol¬ ume of air from the suction pipe enters, and, expanding, fills the barrel. As the rarified air is more and more expelled, the water gradually rises in the Fig. 95. suction pipe. Suppose that the piston VT and the water are at R, then, on VT rising, the water enters, and when VT reaches AB, the whole barrel is filled; the water has thus been sucked into the barrel. When VT begins to move down, R closes, and S opens; but it requires a forcing down of the piston to make it pass through the valve S into the pipe OL ; the whole will be forced into this pipe as soon as VT is at R. A new volume will enter by R on the rising of VT, and S will be shut by the weight of the column in O L ; an additional force, therefore, will be required to ex¬ pel this second volume, owing to the column in OL. A small force is required to lift the piston-rod, but the force requisite to overcome the resistance in pushing it down, is that which would balance a column of water of a height equal to the distance between the level of water in pipe OL and the bottom of the piston, the sectional area being that of the piston. Since a great pressure is necessary to force the water into the pipe OL, the rod Q must be strong to resist the compression. 514. In the case of the forcing pump, let H be the ver¬ tical height of the nozzle by which the water is discharged from the bottom of the barrel, then work produced by downward stroke = A/w; (# —^Z), where the quantities are the same, as in the former pump; Total work = Alw {h + |Z) + Alio {H - \l) = Alw (h + H) = P; or mP ; and Z = also of the Bramah press. If, therefore, pistons are to fit ac- Machines , , , i. i «s for Raicirw where m is the coefficient. Aw{]i + //) 2. The Plunger Pole Pump. Fig. 96. 515. It is very difficult at times to make the pistons move water-tight in their casings, especially where dirty water is to be pumped up, as in the drainage of mines, and in the case curately, they must be solid, as in fig. 96, where O is a solid piston, nicely turned and po¬ lished, its diameter being a lit¬ tle less than that of the cylinder CAGD, and working through a water-tight collar or stuffing- box DC. The small cistern XY, around the head of the pump, is kept full of water, for the purpose of keeping moist the air-tight collar. The small pipe R SZ in this cistern, is that, when the plunger O is at M, water may be poured into it by the cock S, so that the barrel AD may just be full. The piston-rod works through four rings T, of soft leather; HIGA are bolts binding the parts to¬ gether. Suppose, now, that the plunger-pole O is at M, that water has been admitted by RSZ, and that the cock S is shut, then, on the plunger being drawn up, the air from pipe B will force up M, ex¬ pand, and fill the barrel, to¬ gether with so much water, while N is kept shut by the pressure of the atmosphere. When O descends, it drives the water before it, forcing down M, opening N, and expels a volume of water and air by LK. But on O reaching M, then N closes. There is still so much air in the barrel, but a few strokes of the pump will expel it, so that afterwards water only fills the barrel. One great advantage which this pump has, is that it does away with the necessity of boring and polishing large cy¬ linders accurately true, which ot itself was a task of extreme difficulty ; and even though it be done, yet the constant rubbing of the piston on the sides of the cylinder would soon reduce the diameter of the piston, necessitating there¬ fore its frequent removal and renewal. The only wear, however, in the case of the Plunger-pole pump, so called because it plunges into the barrel, is the rubbing of the pole on the leather casing, and also the piston-rod Y through T; but these collars can be replaced at little expense. Although the air may generally be said to be expelled shortly after the pump has made several strokes, yet to secure the utmost effect of the machine, a small right-an¬ gular channel is cut in the pole, one end communicating with the cylinder, and the other at the top of the pole, where there is a cock. If any air should accumulate at the top of the barrel, the cock is opened, and it is forced out. 3. The Mining or Draining Pump. 516. In draining the water from a mine with a single forcing pump, it is clear that there would be a column of several hundred feet, and a piston-rod ol the same length. The working of such a pump would evidently require to fulfil conditions which would be impossible. In order, thei e- fore, to drain mines, the method sometimes adopted is to divide the whole length of the shaft into several equal parts, at each of which a pump is established. The princi¬ pal rod extends from the top to the bottom of the mine, carrying at equable distances heavy plunger-pole pistons, which work up and down in the cylinders of their respec¬ tive pumps, guided all at the same time by the upward am downward movement given to the principal rod by t e steam-engine at the mouth of the mine. There are ascen- for Raising Water. HYDRODYNAMICS. 177 Machines sion pipes of equal length on each side of the main rod; for Raising the lower end of each dips into its respective open reser- Water. voir> the upper end of each empties its water into the reservoir immediately over the former. Each ot these pipes has two valves opening upwards, the one below, the other above its communication with the body of the pump. When the pistons rise, the upper valves close and the lower open ; the atmospheric pressure now acting on the surface of the several reservoirs, forces the water up into the side pipes by suction, so that on the pistons descending, the upper valves are driven open by the ascending water which is emptied into a reservoir, and the lower shut. In this way all the pumps of a Mining pump act. (c.) 1. The Fire Engine. 517. The pump used for extinguishing fires is a double forcing pump, and is called the Fire engine. The pipe by which the water is thrown upon the fire is very flexible, so that it may be directed at pleasure to any part of the confla¬ gration, whilst the pump is acting. The height of the jet will thus be variable, and if the pipe be held in a hori¬ zontal position it will be nothing. But the object required in the working of the machine is not so much to send the water to the extremity of the flexible pipe, as to give the water a considerable velocity when the jet issues from it. A jet is thus produced of great range, which can easily be directed to distant parts, where the fire is to be arrested. In order to effect this, the jet which issues from the pipe should escape with a uniform velocity. Hence, for this purpose, we have on both sides of the machine a forcing pump, each moving alternately during the same time, and by their united action constituting a pump of double effect. The pistons S, R, of the pumps WX, TU (fig. 97), move at the same time, but in contrary directions; when one is up the other is down, and vice versa. The water introduces itself into the interior of the pumps by the valves O, G; when a Fig. 97. pump is full, the piston descending, shuts G and opens K, and the same with the other ; the water is thus thrown into the reservoir abed, into which is plunged the ascension pipe fe, forming part of the flexible pipe. Although there are two forcing pumps employed for throwing water into the reservoir, yet this arrangement does not ensure that regula¬ rity of velocity of escape which might be expected, since a marked irregularity or a retardation of the water takes place every time that each piston changes the direction of its mo¬ tion. The velocity of the water, however, is regulated by VOL. XII. a volume of air lodged above YZ in the top of the air re- Machines servoir ac. This air is completely inclosed ; it puts itself in for Ramng equilibrium with the pressure of water under it» and its ^ t elastic force, acting on the surface of the water YZ, forces the water up the pipe fe to the stop-cock eg, whence it passes to tube h attached to the leathern tube or hose. By means of the air vessel, then, the irregularities which the volume of water entering by I, K presents, are mainly lelt in the reservoir ac into which they open, and are removed by the oscillations of the water which rise and fall alternately. It results from this, that the variations are very small, yet sensible in the velocity with which the water spouts out at the extremity of the hose. The long pipe or hose is of con¬ siderable transverse dimensions, but contracted to a narrow point at its nozzle. The water passes gently from/along the hose, and it is only on entering the narrow portion that it receives a considerable velocity of escape. The height, then, to which the water will be thrown depends on the con¬ densation of the air in the air vessel, and on the elevation of the extremity of the pipe above the level of the water in/. The fire-engine is made long and narrow ; a section of its breadth is ABCD in fig. 97; the principal use of the length, is to support a frame-work which is balanced on a horizon¬ tal axis, of which g is the projection, parallel to the length, and right over the reservoir ac. At each end of this axis is a lever a/3, united at a and /3 by two long handles, of which the projections are a and /?. Several men, standing on both sides of the engine, gripe the handles so as to work the pump’s pistons R, S, to which they are united by vertical rods. The long body of the engine serves likewise as a cistern into which pails of water may be poured, if there be not a convenient supply from a pipe F communicating with the cistern of the engine and the town mains. 2. Delahire's Pump. 518. Delahire’s pump consists of a working barrel AB, shut at both ends A and B (fig. 98). C is the piston, and its rod O passes through a leather collar A. Communicating with the barrel, by the passages m and n which are near the top and bottom of the barrel, are two pipes H and K. The valves F and G open upward, D and E are similarly circumstanced. The action of the pump is evident. Suppose that the air has been with¬ drawn, that the water is at D, and the piston C close to n, when the piston- rod O is drawn up, all the valves will be shut except F and D, the latter of which must open first by the pressure ot the water ; the barrel, therefore, will be full when C is at A. If C de¬ scends, a volume of water must be ex¬ pelled by E, which immediately opens on the descent of C, while D shuts. But as C is forced down to expel the water under it, the valve F instantly opens by the force of the water, and fills up the vacant space above C, the valve G falling by the pressure of the atmosphere. Now, the first volume of water was expelled by the pipe H, and it is just rising in that pipe while C has reached n ; but as soon as C begins to rise again, the valve G is forced open by the water above C, and F shuts ; the valve E is also closed by the fluid column above it, and D opens to fill the barrel under C. Hence we see that two barrels of water are expelled by the common pipe L at each stroke of the pump, so that the stream is continuous, or nearly so. There is, however, an awkward jar or shock at each change of the action ; but this is entirely removed by Fig. 98. 178 HYDRODYNAMICS. Machines using an air vessel similar to that of the hydraulic ram. for Raising Thjs pump is extensively used for supplying air to furnaces, Water. an[j jt jg (;jien cai]e(j tiie double-acting air-pump. (See Hist, et Mem. de I'Acad., 1716; Belidor’s Architecture Hydraulique ; and Leopold’s Theatrum Machinarum Hy- draulicarum. 3. The Bramah Press. 519. The principle on which the Bramah press depends for its efficiency, is the equable distribution of pressure in fluids. Fig. 99 represents the machine, while fig. 100 is a Fig. 100. section of it. A A is a very strong cylinder inclosing a plunger piston B, having on its top a plate C. The piston, wrought by means of water, rises with its plate, and presses with great force any substance upon it against the roof plate D firmly bound to the pillars EE. The water is introduced into the cylinder A by means of the injecting pump F. This inject¬ ing or plunger pump is worked by a lever GH, of the second kind, moving round H, the power being applied at the han¬ dle G. As the handle receives an upward and downward movement, the plunger piston I ascends and descends, and transmits pressure against the bottom of the piston B by means of the water. The movement of the piston I is guided by the circular hole K, in which the free end of the piston-rod moves ; the piston-rod of I is connected with the lever GH. At every stroke, then, of this piston, water is sucked up by the valve M from a reservoir placed under this pump, and is driven into the pipe L communicating with the cylinder A. M and N are two valves, which esta¬ blish and intercept alternately the communication of the body of the pump A with the sucking pipe at M, and the connecting pipe L. The forcing valve is N, and the sucker valve M. It is of the utmost importance that the surface of the pistons with the walls of the respective cylinders should be as close as possible, especially at the tops of the cylinder, and that the packing between them should be perfectly water-tight; for if there be the smallest leakage, a volume of water would inevitably escape. A leak, however, near or about I, is of less moment than at some part of A. For were Fig. xoi. the motion of the injecting piston I somewhat rapid, all the Machines water would not have time to pass out by the leak at A, and for Raising therefore a portion of the water would always be effective. Water. Special attention is always paid by engineers to the secure 's*v^ packing of the collars of the piston A, so that the pressure may be transmitted from one cylinder to another unchanged. On every descent of the piston I, a volume of water is forced through the valve at N. This valve closes the instant the piston has made its complete downward motion, and pre¬ vents the water from returning. The water thus thrown in, must be either compressed or must occupy a larger space. Practically speaking, water may be regarded as incompres¬ sible, and thus the water forced into the cylinder A must increase at every stroke, and the cylinder being too strong to yield, the piston B with its loaded plate must ascend. The piston will thus rise through a small space for every additional volume of water thrown in. As soon as the re¬ quired effect has been produced, the pressure is immediately relieved by opening the discharge valve R, when the water returns to the cistern ; and the piston B descends by its own gravity. The packing of the piston B is too ingenious and im¬ portant a matter to be passed over without notice. Lej fig. 101 be a section of part of the main cylinder and piston, where A is the cylin¬ der, KB the piston. KB is about 9 inches, DE is a recess in the former, about one- half inch deep ; the collar FG is a double leather turned over a metal ring H, placed in this recess. Bramah, in order to prepare the collar, took an annular piece of leather and steeped it in a solution for some time. Having softened the leather, he next placed it over the top of the metal ring H. Now, when the water is pumped into the cylinder, it enters the narrow space between the walls of the cylinder A and piston B, then into the recess DE, and acting on the under surfaces of the turned-over leather on both sides of the ring H, forces the faces on the sides of the piston and on the back of the recess. The more water then that is pumped in, and as the piston begins to rise, the pressure on the inner leather face is increased, so that the piston and cylinder being perfectly air-tight by means of the firmly pressed leather, no water can insinuate itself between the edges F, G, and escape. The greater the pressure on the leather, the tighter will the packing be¬ come, provided only that the leathers be sound. When the machine is begun to be worked, the leather gradually rises up to the top of the recess by the mere pressure of the water, and even before the piston has commenced rising. The leather packing will thus assume the form as in fig. 102. As soon as the discharge valve R is open, so that the pressure fll Q fh may be removed, the leather is free and no longer pressed, and Flg’ 102‘ both it and the ring will slide down to the bottom of the recess. The edges of the leather are not so low as the lower edge of the ring H, in order to prevent the leather edge at F from coming between the cylinder and piston. 520. A similar contrivance renders the injecting pump water-tight. Fig. 103 represents the barrel mm, and n the plunger piston ; aa is a copper ring lying horizontally be¬ tween leather packing, which are the dark pieces. The ring has its upper and under surface scored, so that on the plunger being put in, and the piece bb screwed down, having a hole pierced in its mass to allow the working of the cylinder, the ring and the leather are in close contact, and the pressure squeezes out the leather on the side next the piston, and on the side next the barrel, thus prevent¬ ing the water from escaping. The barrel is slightly curved as at cc, so that the water may get behind the leather, HYDRODYNAMICS. ‘S' Machines press it against the side of the piston, and allow no es- for Raising cape between the piston and the leather. Water. When the pressure is more than three tons on the circular inch, the leathers wear very fast, and new ones must be put in. When the machine begins to act, so as to compress a body between the roof and the plate, the pressure exercised is feeble; but as the body is more and more pressed, the resistance becomes so great, that a large power is required to overcome it. In such a case we remove the fulcrum of the lever GH from H to H', by the insertion of a pin, the bolt( at H being afterwards removed. If HH. be half the former arm, then the former power will Fig.ios. press the body with a greater force than before, and hence, also, a greater force will be transmitted through the water. In order that the pressure transmitted by the water may not be too severe for the several paits of the machine, a safety valve P (fig. 104), is introduced near the pump F. A coni¬ cal valve O intercepts a channel, by which the water may pass out with a force suffi¬ cient to overcome the weight P at the ex¬ tremity of the lever of the valve, when the pressure be¬ comes too great, i.e., when the pressure exceeds the limit beyond which we do not want it to pass. A screw R, the lower extremity of which forms a valve, closes effectually another channel, by which the interior water might be prevented from communicating with the water cistern, during the working of the machine. When the action of the press is to be stopped, the screw R is turned in a convenient direction, and a communication is opened with the water cistern, into which the water flows from the cylinder AA, the piston of which, now no longer subject to pressure, gradually falls within its cylinder. This valve, connected with R, is called the discharge valve. , , . . . 521. Given the force applied at the injecting pump- handle, to determine the pressure on the base of the work¬ ing cylinder. . . f Let S be the area of the working piston s base, s that ot the plunger pump, P the force applied at the injecting pump-handle, L the arm by which P acts at G, and £ that by which acts Q, the resistance to be overcome by the in¬ jecting piston. Then, as the lever is one of the second kind, Q.Z=P . L; .\ = resistance to be over- W-P w r * r ^ Fig. 104. I come. But the pressure exerted is proportional to the area pressed; and whatever be the pressure on a unit of surface of the injecting piston’s base, the same pressure is transmitted to every other such area on the bottom ot the working piston. Hence, action on base of B : action on base of I = base surface of B : base surface of 1 = S : s ; S Action on base of B = — x action on base of I _S P.L ~s’ l ’ This expression is equivalent to the pressure to which any substance placed between the plates C and D is subject; it is the same also as the weight raised, which call , Is But the areas of circles are as the squares of their radii, hence - =~, where R and r are radii of the base of the s r1 pistons B and I respectively ; Wherefore, the efficiency of the press will be increased, by • • X, L R increasing either of the quantities I, ^ , or ^. R Since the value of the ratio may be increased to an almost indefinite extent, it is clear that the press may be said to have no limit to the pressure exerted, except the strength of the materials. But, in a practical point of view, the indefinite value of —• may be said to be inapplicable ; r for when — is in value very large, the volume of water T introduced at every stroke of the pump would be so small that the piston would ascend too slow for all practical purposes. As it is desirable to save time in working with this press, and as one workman can easily work the instrument at the commencement, there are generally two injecting pumps, a large and a small one, standing side by side, and both communicating with the forcing valve. It the diametei of the piston of the large injecting pump be double that of the smaller, and their barrels of the same length, then the vo¬ lume of water forced in at every stroke by the former will be four times greater than that of the latter. Hence the first pump will raise, at each stroke, the working piston through any space quicker by four times than that of the second piston. Again, since the pressure is proportional to the area, a man at the large injecting pump would only require to exert a force one-fourth that which he would require to employ at the small injecting pump, supposing their levers to be of the same length. Wherefore, for the sake of speed, the large pump is worked first; and, when the effort required becomes too great, the small one. The effect evidently is the same as the shifting of the fulcrum point of the lever. Further, in order to guard against accident, as, e.g-, if the forcing valve N should be prevented from working by the intervention of dirt sucked up by M when the plunger I has made its descent, a hole is drilled in the bottom of the piston I, and communicating with another on the side at a small distance above, as represented by the dotted line (fig. 103). Now when the pump is worked properly, the horizontal orifice never rises above the leathers; but, if the plunger be raised a little higher, then the water will find its way between the metal surfaces of the plunger and barrel, and immediately the pressure on the base of the working piston will be diminished. 522. The Bramah press is perhaps the most perfect hydraulic machine with which we are acquainted. It is subject to little or no friction, nor to the rapid wear of its metal surfaces in contact; the only repairs that it may re¬ quire are the renovation of the leathers, and yet these, under ordinary pressures, will last several years. I his hydraulic press is used in almost every department of industry. It is used for throwing light articles into small bulk; for ex¬ tracting oil from hides previous to tanning; for pressing cloth; for extracting moisture from paper. It is used in the manufacture of gunpowder, sugar, wax-candles, ver¬ micelli, &c. It is peculiarly adapted for testing the strength of cables and masses of metal; for extracting old piles, and uprooting trees; for raising or sustaining a building that has sunk a little ; and also for quarrying purposes. The printer and chemist know its value ; and recently the engineer suc¬ cessfully accomplished, by means of the Bramah press, the 179 Machines for Raising Water. elevation of the Menai Tubular Bridge. 4. The Centrifugal Pump. 523. Mechanicians have endeavoured to replace the up- 180 HYDRODYNAMICS. Machines ward and downward action of the piston in machines for for Raising rajsing water into a rotatory, or a motion always in the ^ Water. same direction. Bramah, in England, and Dietz in France, attempted to produce a machine which would work in this manner. That which the latter invented is represented in fig. 105. Machines of this description are known as Centrifugal pumps: attention has been directed within these few years past to these engines on account of their great efficiency. The principle of their action will be understood from the following description, within a fixed onePQ, in the annular space BB, each having the same axis. In the ro¬ tating cylinder are four plates or pieces C, C, C, C, which extend nearly, but not quite to the fixed cylinder; these plates are insert¬ ed in corresponding openings on the ex¬ terior surface of the rotating cylinder, and the space BB is divided into four compartments, each sepa¬ rated from the other. The exterior and interior edges of the plates are not parts of the exterior and interior surface of AA, although they move with it; these edges, which are equidis¬ tant from each other, approach when towards the right the centre O of the ring AA, such that the exterior edge of each plate in turn comes to form part of the outer sur¬ face of AA, while in other parts they form part of its inner surface. It is the form of the space BB which causes the plates C, C to glide into the slits of AA, and to near and go from alternately the axis of rotation. Hence, the four compartments are not always of the same capacity ; their magnitude increases as the plates are distant from, but de¬ creases as they approach, the axis of rotation. There are two openings in the fixed cylinder, each protected by a bent surface or opening valve, attached at one end to the fixed cylinder, while the other end is free ; the one communicates with the suction pipe M, the other with the forcing pipe N. As the cylinder AA turns, one compartment is presented to M ; it increases its capacity, sucks in water from that pipe, and becomes filled at the moment of its greatest dimen¬ sion. This space diminishes on whirling round to the opening of the forcing pipe N, and a centrifugal force being imparted to it, drives the water forward, and compels it to discharge its contents into that pipe, and so on with all the others. We see, then, that this centrifugal pump acts at once as a sucking and a forcing pump; and fulfils, moreover, the conditions of a pump of double effect, since the movement given to the water in both pipes is con¬ tinuous. When the pump is set in motion the air from M is sucked out, and being carried round empties itself into N, so that the machine acts also as an air pump. 524. Mr Appold exhibited at the Crystal Palace in 1851 the form of a centrifugal pump, for which he was adju¬ dicated the council medal. In Appold’s pump the water enters by a circular opening, 6 inches wide, surrounding the axis with which the fan is connected. The fan-blades are 3 inches wide, and revolve within a fixed cylinder 12 inches diameter. I he fan-blades consist of six curved arms. These curved fins are so disposed that the extremities at the fixed cylinder move tangentially, while the other extremi¬ ties are fixed on to the rotating cylinder; the blades them¬ selves pass through a stuffing-box in the side of the casing, working between two circular cheeks, and running close to them, but without actual contact. The outer revolving ylinuer A A (hg. 105), revolves Q Fig. 105. surfaces are thus shielded from the water, to which a free Machines ingress is given, and a large space is left all round the for Raising circumference of the fan, to facilitate the escape of the dis- Water, charged water. Mr Appold showed the decided advantage of curved fins over straight ones. When the curved fins were used, the jury found, from the experiments, that with a lift of 19^ feet, and a velocity of 788 revolutions a minute, and a circum¬ ferential velocity of 2476 feet per minute, the discharge was 1236 gallons a minute, and the useful effect was 0‘68 of the power. With nearly the same lift, a fan having straight inclined arms, and rotating at the rate of 690 revo¬ lutions a minute, and a circumferential velocity of 2168 feet in the same time, the discharge was 736 gallons; the use¬ ful effect was only 0’43 of the power. With straight radial arms, and nearly the same velocity, the discharge was 474 gallons, and the useful effect only 0-24 of the power. But Appold’s machine is supposed to have a useful effect of 0’72 of the power, with a circumferential velocity of 1627 feet a minute, precautions being adopted which could not be employed in the experiments made at the Great Exhi¬ bition. The largest pump of this kind as yet constructed, is that at Whittlesea Mere for draining purposes. The wheel is 4‘5 feet in diameter, and its average velocity is 90 revolutions, or 1250 feet per minute; it is driven by steam with 40 lb. on the square inch, and raises 15,000 gallons to a height of 4 or 5 feet in one minute. The centrifugal pump is most advantageous for low lifts, espe¬ cially for those below 20 feet. Its best application is as a tidal pump, where the height of the lift is continually varying. 525. In the Centrifugal pump we have the same princi¬ ple as will be seen in Barker’s mill; the object of each, however, is different. In the latter, a fall of water through a hollow upright cylinder, with an axis passing through it, gives a rotatory motion to that vertical axis; while in the former, a rotatory motion is given to a vertical axis, in order to raise a column of water. Let P = the work in one second, applied in giving motion to the ver¬ tical axis; /i = height to which the machine raises a column ; v = absolute velocity of water after discharge; V = velocity due to height; P'=useful work per se¬ cond ; then, as in the reaction wheel, »work done at efflux = work due to the centrifugal force, less the work spent in raising the water; hence v= — 2gh = velocity of water due to the pressure in the vertical pipe, as w'ell as that which is due to the centrifugal force ; w = the weight of a volume discharged in one second; t/ = VV2 - 2gh — V. So also the work applied = work in raising the water + work in w ater after efflux ; ...P=^ + ^ = ^(V_VV^2P)V, which, by expansion, gives, when V is infinitely increased, P' = wh. The effective nature of the machine will be ex¬ pressed by o _z: ^ P (V-VV'-2yA) The maximum effect of the machine, or Q, will take place when V = infinity. Professor Mosely, in his Report, observes, respecting Mr Appold’s centrifugal pump, that if the vanes be straight, it is evident that whatever may be the velocity of the water in the direction of a radius, when it leaves the wheel, its velocity in the direction of a tangent will be that of the circum¬ ference of the wheel, so that the greater the velocity of the wheel, the greater will be the amount of vis viva remaining in the water when discharged, and the greater the amount of power uselessly expended to create that vis viva. hydrodynamics. 181 , i.*nac If however, the vanes be curved backwards as regards ^Raising the motion of the wheel, so as to have nearly the direction Water. 0f a tangent to the circumference of the wheel at the points ^—' where they intersect it, then the velocity due to the centri¬ fugal force of the water carrying it over the surface ot the vein in the opposite direction to that in which the wheel is movino1, and nearly in the direction of a tangent to the cir¬ cumference, will, if this velocity of the water over the vane in the one direction be equal to that in which the vane is itself moving in the other, produce a state of absolute rest in the water, and entire exhaustion of vis viva. And in whatever degree the equality of these two motions—ot the water in one direction over the vane, and of the vane itself in the opposite direction—is attained, in that same degiee will the water be delivered in a state approaching to one of rest. The expedient of curved vanes is adopted in Mr Appold’s pump. , i .. With regard to the admission of water to the wheel, it is obvious that it should pass directly from the suction-pipe into the wheel without the intervention of any reservoir in which the vis viva of the influent stream—communicated in the act of rising through the pipe may expend itse , and that such space should be allowed at the centre as not to alter the dimensions of the influent stream. It would further seem expedient, by means of properly constructed channels, to divide the water into separate streams, and to give to these divergent streams such curvatures Jvou facilitate their entrance upon the channels formed by the vanes, as in the Turbine or Reaction Wheels. It is obvious that the tendency of the centrifugal force continually to increase the velocity of the water over t/ie vanes as it recedes from the centre, cannot take effect in respect to all the particles of water in the same section, un¬ less the sections of the channels diminish. It they do not, some of the particles of water in each section must e continually retarded, and power be uselessly expended in producing this retardation ; whilst the current cannot bu suffer from it a disturbance destructive of its vis viva. This diminution of the sections of the channels might probably best be effected by giving to the sides of the wheel the forms of conical disks ; an expedient which is adopted in Mr Lloyd’s blowing machines, and in Mr Ressemers centrifugal pump. The communication of motion to the water of the reser¬ voir in which the wheel revolves, and into which the water is discharged, should by every practicable expedient be avoided; and for this object the water should be kept as much as possible from the sides of the wheel, ihis is effected in Mr Appold’s pump by fixing the wheel between two cheeks which project from opposite sides of the reser¬ voir. The velocity with which the wheel must be driven depends upon the height to which the water is to be raised. Beyond a certain height this velocity is practically unat¬ tainable. But long before this limit is reached it becomes inconsistent with an economical application of the power which drives the pump. It is probably therefore only in comparatively small lifts, where a large quantity o water is to be discharged, that the centrifugal pump will be found useful.1 The Screw-Engine of Archimedes. 526. The screw-engine invented by Archimedes is re¬ presented in fig. 106, where AB is a cylinder with a flexible pipe, CEHOGF, wrapped round its circumference like a screw. The cylinder is inclined to the horizon, and sup¬ ported at one extremity by the bent pillar IR, while its other extremity, furnished with a pivot, is immersed in the water. When, by means of the handle K the cylinder is made to revolve upon its axis, the water winch enters the Water * Fig. 106. lower orifice of the flexible pipe is raised to the top, and discharged at D. On some occasions, when the water to be raised moves with a considerable velocity, the engine is put in motion by a number of float-boards fixed at L, and impelled by the current; and if the water is to be raised to a great height, another cylinder is immersed in the ves¬ sel D, which receives the water from the first cylinder, and is driven by a pinion fixed at I. In this way, by having a succession of screw-engines, and a succession of reservoirs, water may be raised to any altitude. An engine of this kind is described in Ferguson’s Lectures, vol. ii., p. 113. _ 527. In order to explain the reason w hy the water rises in the spiral tube, let AB (fig. 107) be a section of the engine, BCdDE the spiral tube, a. BF a horizontal line or the surface of the stag¬ nant water which is to be raised, and ABF the angle which the axis of the cylinder makes with the horizon. Then, the water which enters the extremity B of the spiral tube will descend to C, and remain there as long as the cylinder is at rest. But if a motion of rota¬ tion be communicated to the cylinder, so that the lowest part C of the spiral BCD moves towards B, and the points d, D, E towards C, and become successively the lowest parts of the spiral, the water must occupy successively the points d, D, E, and therefore rise in the tube; or, which is the same thing, when the point C moves to e, the point d will be at C ; and as the water at C cannot rise along with the point C to c, on account of the inclination of Cc to the horizon, it must occupy the point d of the spiral, when C has moved to c; that is, the water has a tendency to occu¬ py the lower parts of the spiral, and the rotatory motion withdraws this part of the spiral from the w'ater, and causes it to ascend to the top of the tube. By wrapping a cord round a cylinder, and inclining it to the horizon, so that the angle ABC may be greater than the angle ABF, and then making it revolve upon its axis, the preceding remarks will be clearly illustrated.—If the direction of the spiral BC should be horizontal, that is, if it should coincide with the line BF, the water will have no tendency to move to¬ wards C, and therefore cannot be raised in the tube, tor a similar reason, it will not rise when the point C is above Fig. 107. 1 Mosely’s Report. 182 HYDRODYNAMICS. Machines the horizontal line BF. Consequently, in the construction ^°Water enS‘ne’ ^ie an^e ABC, which the spiral forms with v ‘ the side of the cylinder, must always be greater than the vangle ABF, at which the cylinder is inclined to the hori¬ zon. In practice, the angle of inclination ABF should generally be about 50°, and the angle ABC about 65°. 528. The screw of Archimedes is now generally construct¬ ed as shown in the annexed figure, where AB is the axis of the screw, having a flat plate of wood or thin iron coiled, Fig. 108. as it were, round the axis, like a spiral, or the threads of a screw. The plane of this plate is perpendicular to the sur¬ face of the cylindrical axis AB, but is inclined to the direc¬ tion of the axis at an angle which must always be greater than the angle which the axis AB forms with the horizon when in use. This spiral plate, which is nothing more than a wooden screw with a very deep and narrow thread, is fixed in a cylindrical box CDEF, so as to form a spiral groove, as it were running up the tube from B to A, which is exactly the same thing as if a pipe of lead or leather had been wrapped round the cylindrical axis, as in fig. 108. If the outer case CDEF is fixed so that the screw revolves within it, the engine is called a water screiv- engine. In the common screw-engine, Eytelwein has shown that the screw should be placed in such a manner that only one-half of a convolution may be filled at each revolution. When this condition, however, cannot be ful¬ filled, from the height of the water being variable, he gives a preference to the water screw, notwithstanding that in this case one-third of the water generally runs back, and the screw is apt to become clogged by impurities or weeds. 529. In a screw-engine erected at the Hurlet Alum W orks, for raising the alum liquor, the length of the screw is 127 feet, its inclination to the horizon 37° 36'; the height to which it raises the liquor 76 feet 9 inches, the octagonal axis of the screw 8 inches in diameter, the diameter of the spiral 22 inches, the thickness of the covering 2 inches, the distance of the threads 9 inches, the number of the threads 168, the thickness of the spiral 2 inches, the width and depth of the spiral tube 7 inches each. The screw is sustained upon five sets of pivots or rollers, each set con¬ sisting of two rollers. The engine is driven by a water¬ wheel, which performs one revolution while the screw per¬ forms two. The quantity of liquor raised is 70 wine gal¬ lons ; and as its specific gravity is T065, the quantity dis¬ charged in an hour is 17 tons. The screw is built wholly ot wood, as the alum liquor acts upon iron. 530. The theory of this engine is treated at great length by Hennery in his Dissertation sur la vis d’Archimede, Berlin, 1 / 6* ; by Pitot, in the Memoirs of the French Aca¬ demy ; and by Euler, in the Nov. Comment. Petr op., tom. v. An account of Pitot s investigations may be seen in Gre¬ gory s Mechanics, vol. ii., p. 348. See also Eytelwein’s Handbuch der Mechanick, ch. xxi.; and Journal des Mines, tom. xxxviii., p. 321. The Spiral Pump, or Zurich Machine. 531. The Zurich machine consists of a cylindrical or spiral pipe, having one extremity dipping into the water to be elevated, and its other end communicating with an ascen¬ sion pipe, whereby the w-ater is discharged. This machine was devised, in 1746, by an ingenious pewterer of Zurich, named Wirtz, and its theory has been investigated by Bernouilli, Eytelwein, Robison, and others. When the machine was first erected, and its capabilities tested, it was used successfully at Florence and in Russia. It is now scarcely to be found out of Holland, where a considerable number are to be seen driven by means of windmills. Fig. 109 will give us an idea of this machine and its manner Machines for liaising Water. of working. The dipping extremity of the pipe is scooped like a spoon or horn, and capable of taking in a volume of water which will fill half a coil. 532. After the scoop has emerged, the water passes along the spiral by the motion of it round the axis, and drives the air before it into the rising-pipe, where it escapes. In the meantime, air comes in at the mouth of the scoop; and when the scoop again dips into the water, it again takes in a similar quantity. Thus there is now a part filled with water and a part filled with air. Continuing this motion, we shall receive a second round of water and another of air. The water in any turn of the spiral will have its two ends on a level; and the air between the successive columns of water will be in its natural state; for since the passage into the rising pipe or main is open, there is nothing to force the water and air into any other position. But since the spires gradually diminish in their length, it is plain that the column of water will gradually occupy more and more of the circumference of each. At last it will occupy a com¬ plete turn of some spiral that is near the centre; and wdien sent farther in, by the continuance of the motion, some of it will run back over the top of the succeeding spiral. Therefore it will push the water backwards, and raise its other end, so that it also will run over backwards before the next turn be completed. And this change of disposition will at last reach the first or outermost spiral, and some water will run over into the horn and scoop, and finally into the cistern. 533. But as soon as water gets into the rising pipe, and rises a little in it, it stops the escape of the air when the next scoop of water is taken in. Here are now two columns of water acting against each other by hydrostatic pressure and the intervening column of air. They must compress the air between them, and the water and air columns will now be unequal. This will have a general tendency to keep the whole water back, and cause it to be higher on the left or rising side of each spire than on the right descending side. The excess of height will be just such as produces the compression of the air between that and the preceding column of water. This will go on increasing as the wrater HYDRODYNAMICS. 183 Machines •or Raising Water. Blowing Machine. mounts in the rising pipe; for the air next to the rising pipe is compressed at its inner end with the weight of the whole column in the main. It must be as much compressed at its outer end This must be done by the water column with¬ out it; and this column exerts this pressure partly by reason that its outer end is higher than its inner end, and partly bv the transmission of the pressure on its outer end by air, which is similarly compressed from without. And thus it will happen that each column of water, being higher at its outer than at its inner end, compresses the air on the water column beyond or within it, which transmits this pressure to the air beyond it, adding to it the pressure arising from its own want of level at the ends. Therefore, the greatest com¬ pression, viz., that of the air next the mam, is produced by the sum of all the transmitted pressures; and these are the sum of all the differences between the elevations of the inner ends of the water columns above their outer ends ; and the height to which the water will rise in the main will be just equal to this sum. (a.) TheChapelet ; (/3.) The Chain Pump ;(y.) The Norm ; (8) The Elevating Palette Wheel; (e.) The Elevating Bucket Wheel; (£.) The Tympanum. 534 (a.) The Chapelet consists of an endless chain or rope, on which, at equal distances, are flat disks of wood or iron fixed perpendicularly to the rope which passes through the centres of the flat disks. This chain passes over an upper and an under wheel, both of the same diameter. I he lower is below the surface of the water to be raised ; and these disks, in rising, pass through the interior of a hollow pipe, the breadth and length of which are the same as that of the disk. Every time, therefore, that a disk passes through this pipe, it isolates a volume of water, and empties it into the reservoir at a certain height above the water to be raised. Again, this chain may be laid obliquely to the horizon, and ^water may be raised to a less elevation, but in less quantity, as when it is working vertically. 535 (/3.) If in the chapelet we remove the disks, anti tor the upper radiating wheel substitute a solid circular disk, and for the lower a small pulley, and let a piece of loose tow or hair chain work up and down, then the rope in passing through the water will carry up so much with it; and as it passes over, the upper wheel will be compressed, and there¬ fore force the water out of it into a reservoir. Ibis ma¬ chine is known as the Chain Pump. Water. Blowing Machine. 536. (y.) If instead of disks in the chapelet we substitute Machines buckets or pails, each connected with an endless rope, then fo^lalsrinS water may be raised to any elevation. Every time that a bucket enters the water it emerges full, and when it has reached its highest turning point, the bucket is emptied into ^ the reservoir. This is the Noria or Bucket Machine. These macliines are commonly used for draining and irrigating purposes. 537. (S.) If we conceive the wheel of art. 466 to be close to the circular course and turning in the opposite direction, and if we suppose the lower water-course the current of supply, then we shall have water raised to a height not ex¬ ceeding half the diameter of the wheel. The machine is driven°by a windmill or by steam, through the intervention of a toothed wheel acting on the teeth of the inner circum¬ ference of the wheel. By this arrangement the axis of the palette wheel is not much charged by the weight of water elevated, and consequently the friction of the wheel is much reduced. This is the Elevating Palette Wheel. It is evident that this wheel is nothing else than an un¬ dershot or breast wheel, acting opposite to their mode of working. 538. (e.) The Elevating Bucket Wheel may be regarded as an overshot wheel working in the opposite direction. The buckets, or water compartments, begin to empty themselves by holes in the inner circumference of the wheel when near their highest turning point. All the water is received ere the wheel has passed its highest point. 539. (£.) The Tympanum is also an elevating wheel, but much more efficient than either of the two former. It con¬ sists of a hollow circular drum, in which are four or more curved or spiral partitions, united to as many rectangular beams of a small height, of the same breadth as the dium, and proceeding from a revolving axis; the outei ends of these partitions are tangents to the drum. A crown wheel passes round the external circumference of the wheel, while a small crown wheel, turned by an engine, works into the teeth of the former wheel, and sets the whole apparatus in motion. Hence, as the mouths of the passages dip into the water a volume enters, which is carried by the motion of the wheel to seek the lowest point of the passage, which is at the axis of the wheel, where, finding a small opening, it empties itself into the reservoir. The friction of this wheel is inconsiderable. _ These three last machines are much used in France for irrigating purposes. CHAPTER IV.—ON THE BLOWING MACHINE OR WATER-BELLOWS. The Trompe, or Water-Bellows. 540 Professor Magnus, at the close of his experiments on the motion of fluids, already detailed, gives an account of this piece of mechanism, the principle of which he thinks is to be referred to the penetration of a fluid by air. it is the so-called trompe, or water-bellows, which, according to Grignon,1 was discovered in Italy about the year 1640 I he instrument is represented in fig. 109, drawn from the de¬ scription given by Richard in his Etudes sur l Art d extraire immediatement le Fer de ses Minerals, p. 169. B is a water-holder, kept always full by means of the canal Z. A, A are two tubes or hollowed beams about thirteen feet long, one of which is shown in the section. CC is a wooden cistern or barrel rendered air-tight; the tubes A, A widen toward the top ; two boards^, p, inclined towards each other, are introduced above into each tube, thus forming a funnel-shaped narrowing of the orifice; the boards are kept asunder by the pieces of wood t, t. Below these pieces a number of apertures e, e, are made in t le tube, through which air can enter. Similar apertures e, e were made in Richard's instrument about half way up the tubes; from these water sometimes escapes, as Richard him¬ self has found, and for this reason it would be better to omit them altogether. When the conical stopper of the funnel-shaped orifice p, p is drawn upwards, the water falls through the tube, and at the same time air is sucked in at the orifices e, e ; as this is carried downwards by the water into the cistern, the air in the latter increases, and passing into the tube H, streams out of the opening b. At g, in the bottom of CC, an opening is made through which the descending water can escape; the magnitude of the open- ino- is so arranged that the water can never sink down to it. A^second trough is generally placed before the opening, in which the water must first ascend to escape over the edge. Instead of air being sucked in by ee, we may have, in place of the boards p, p, two wooden funnels high enough to reach over the surface of the water. The water flows through the space between the funnels; this causes the fluid within them to sink and the air to enter. moires de Physique, p. 196. ■ 184 HYDRODYNAMICS. Blowing Machine. 541. The water-bellows is used in some departments of the south of France, and more immediately in the extrac¬ tion of iron from its ores. In the year 1838 it was em¬ ployed, with one or two exceptions, in the Department de TAriege. 542. Much has been written about the water-bellows; but the real cause of the descent o the air into the machine has never been properly ex¬ plained, and it is yet totally un¬ known. Justi as¬ serted lastcentury that the water is changed by the violent motion in¬ to air.1 Venturi again2referred the origin of the bub¬ bles to the lateral motion imparted to the air by the moving stream. This would imply that a force of at¬ traction exists be¬ tween the air and water, sufficient to carry the former far beneath the surface, which is scarcely conceiv¬ able. One of Pro¬ fessor Magnus’ex¬ periments refutes this notion (422). 543. In order that the pheno¬ mena might be ob¬ served with the utmost accuracy, Professor Magnus constructed a mo¬ del glass water- bellows (fig. Ill), where N is the water-holder, in which, by means of a cork, the tube ab, 6 inches long, is fastened. The lower end of ab dips above into Fig. 110. the tube cd, which is 6'5 feet long, and has an inner diameter of fths of an inch ; at it pierces a cork which closes the bottle AB, and it ends at g about two inches above the bottom of the bottle. Through the cork d two other tubes are introduced—de which can be closed by the cock e, and hik which serves as a manometer, and is filled with mercury to k. J 544. When the tube ab had an opening at its lower end of 0 4 of an inch in diameter, as the water flowed through it downwards, a considerable portion of air was carried along with it into the bottle AB. The pressure increased, and as the mercury ascended in k the water rose in the tube cdg. By means of the cocks e and D, the escape of the air and water was so regulated that the water height in cdg re¬ mained constant. When this height was about three feet Blowing over the surface of water in the bottle, the opening being Machine. 0'4 of an inch, a multitude of small bubbles were seen to descend with the water through the entire breadth of the tube. When the diameter was greater, the motion was quicker, so that the course of the bubbles could not be ex¬ actly followed. When, on the con¬ trary, the opening b was smaller, e.g., 02 of an inch in diameter, the air bubbles were observed at/, but they could not penetrate to the lower end of the tube ; as soon as they had attained a certain depth, they rose again in consequence of their small specific gravity. Small isolated bubbles only were able to penetrate to a depth of 24 inches. 545. It is evident that the bub¬ bles are formed at the point where the falling water meets the surface f‘, here they are quite inclosed by the water, and carried with it down¬ wards. If the force which causes this motion be so great that the bubbles descend more quickly than they would arise in consequence of their small specific gravity; then they will reach the bottle AB. This, however, can only take place when the water falls from a suffi¬ cient height, and when the opening b bears a sensible ratio to the dia¬ meter of the tube cdg. If this ratio be small, the motion of the water in the latter is feeble, and the bubbles move more quickly upwards than downwards. If the opening be not much smaller than the tube cdg, the falling water closes up the latter, even when the tube, instead of reaching to g, ends immediately under the cork rf. The water then stands at a height within the tube corresponding to the air- pressure in the bottle underneath; and, in general, exactly the same effects are observed as when the tube cd penetrates the surface of the water. Hence, in the case of the water-bellows it is unnecessary that the tubes A, A (fig. 110), should reach under the surface of water in the drum CC. 546. It will be observed that the action which takes place here is similar to that which is observed Fig. 111. when water is poured into a glass, in which case also bubbles are carried down¬ wards. The phenomena are so far explained by Prof. Mag¬ nus in his experiments on the motion of fluids (416). 547. We have an example of a trompe on a large scale in the method sometimes pursued after an explosion in a mine. The nearest rivulet being allowed to flow down the shaft, a considerable volume of fresh air enters with the water, and renders practicable a descent into the mine to suc¬ cour the injured miners. (See Commerce of Arts ; Wolfii Opera Mathematica ; RichesseMinerale, tom. \\\.‘, Manuel de la Metallurgie du Fer, by M. Karsten, tom. ii. ; Annales des Mmes, tom. ix., 1824 ; xi., 1825 ; Nicholson’s Journal, vols. ii. and xii.) (d. b.) 1 Exhibition of Arts and Manufactures, vol. ii., p. 97. 2 Gilbert’s Annalen, vol. iii., p. 125. H Y D Hydro- HYDROMETER, an instrument for measuring the meter gravity, &c., of fluids. See Hydrodynamics. II HYDROPHOBIA, dread of water (from f'Swp, water, and Hydro- (f)of30t;} fear), though a symptom occurring in several diseases P 0 1 ' y of the nervous system, is now very generally restricted to that disease which results from the bite of a mad dog, wolf, or cat. This disease has been known from the earliest anti¬ quity, and was styled by the Greeks Xvaa-a, by the Latins rabies, and the French rage. The disease is essentially a convulsive one, resembling tetanus, but is characterized by the inability to swallow fluids, the very sight of which in¬ duces convulsive spasms of the muscles of the mouth and pharynx, which extend more or less to the whole body. This disease in man is invariably caused by the bite of some animal of the dog or cat kind, though it has been asserted, without proof, that the bites of other animals have induced the malady. The disease seems to originate in the different species of the genera canis (dog), and felis (cat), and is capable of being transmitted to man and all ani¬ mals by the saliva of these animals being introduced into the system by means of a wound or bite. It has been lately endeavoured to be proved that only those animals in whom the disease originates can communicate it to others, and that the saliva of the animal which has had the disease com¬ municated to it through means of a bite is incapable of com¬ municating hydrophobia to the person or animal it bites. Many lives are lost annually through hydrophobia. In France 48 persons died from this malady in 1852, 25 in England during 1851, 15 in 1852, and 11 in 1853—the last year of which the causes of death are published. From recent investigations in France, it appears that of 136 cases of hy¬ drophobia in the human subject (the particulars of which were investigated by a commission appointed in 1852 by government), 105 followed the bite of a dog, 20 the bite of a wolf, 8 the bite of a cat, while of 5 the particular animal whose bite caused the malady was not ascertained. The persons were of all ages, from the infant at the breast to the old man of ninety. The period of the year when the bite which caused the disease was received was ascertained in 90 cases. In 25 of the persons the bite was received during the months of March, April, and May; in 42 cases, during June, July, and August; in 13 cases, during Sep¬ tember, October, and November; and in 17 cases, during December, January, and February. The disease does not appear in man till some time after the receipt of the bite. Thus, in 69 cases where the exact date of the appearance of hydrophobia after the bite was ascertained, it appeared that in 14 cases the disease appeared within the month after the bite; in 41 cases, from the end of one month to the end of the third month ; in 8 cases, from the beginning of the fourth to the end of the sixth month; and in 6 cases, from the seventh to the twelfth month. No case occurred in which the disease had appeared after more than one year elapsed from the date of the bite. The exact duration of the dis¬ ease from its first appearance to its termination in death was ascertained in 78 cases. Of these 3 died the first day of the disease, 8 the second day, 28 the third day, 21 the fourth day, 4 the fifth day, 4 the sixth day, and the remain¬ ing 10 from the seventh to the twentieth day. This shows the frightful rapidity of the disease. The disease, when once it manifests itself, is quite incurable. Every means must therefore be taken to prevent the disease originating in the person bitten, and many means of cure have been recommended for this purpose; only, as it is known that but a very few of those bitten by a rabid animal take the disease (supposed not to exceed 1 in 20), it is not certainly known whether the subsequent freedom from the disease is to be ascribed to the means resorted to, or to natural causes. The bitten part should be instantly washed, and fluid caustic, or nitric acid, or probably still better, caustic am¬ monia solution, freely applied to the wounded surface, care being taken that the caustic reaches the bottom of the VOL. xn. H Y G 185 tooth-wounds. Many recommend, in addition, to dress the Hydrosta- wounds till they heal with red precipitate of mercury oint- tics ment, and to take internally sufficient mercury slightly to Jj affect the system. Decoction of sarsaparilla and guaiac in- v yginusj ternally, and occasional hot or vapour baths, have, in addition to these remedies, been highly recommended, (j. s—k.) HYDROSTATICS. See Hydrodynamics. HYDRUNTUM, or Hydros, now Otranto, in An¬ cient Geography, a sea-coast town of Calabria, at the mouth of the Adriatic, and the most easterly point of the heel of Italy. Of its early history little is known; but it seems to have been either a Greek city, or to have been at one time inhabited chiefly by Greeks. Till the rise of Brun- dusium, it was a place of considerable importance. The great Roman highway, the Via Appia, terminated there, pouring into the town all the traffic between Rome and Greece, to which it was the nearest Italian port. Pas¬ sengers, however, afterwards came to prefer the Brundusian route as safer, though somewhat longer. In the time of Strabo, Hydruntum had dwindled down into an insignificant spot; but in the fourth century it once more became the favourite route to Greece, retaining its importance till the final overthrow of the Western Empire. The modern Otranto, though the see of a bishop, is a small decayed town, and seems never to have recovered from its siege and capture by the Turks in 1480. The antique remains re¬ covered from its ruins are too trifling to require special notice. Under the French empire it gave the title of duke to Fouche, Napoleon’s famous minister of police. Its present population is rather above 5000. HYERES, or Hieres (anciently Area and Hieros), a town of France, department of Var, and arrondissement of Toulon, on the S. declivity of a hill, 3 miles from the Medi¬ terranean, and 10 miles E. of Toulon. The town itself, which is ill-built and dirty, commands a fine prospect of the surrounding district. The streets are steep, narrow, wind¬ ing, and badly paved. In the principal square there is a column surmounted by a fine marble bust of Massillon, who was born here, June 24, 1663. Pop. 9000. Hyeres, Isles of (anciently Stcechades), a group of small islands in the Mediterranean, about 10 miles S.E. of Hyeres. They are rocky and almost bare, but are strongly fortified. Porquerolles is 5 miles in length by 2 in breadth. HYGINUS, Caius Julius, a celebrated Roman gram¬ marian, was a native of Spain, or, according to others, of Alexandria, in Egypt. Fie seems to have been at one time a slave, and to have been manumitted by Augustus, who made him keeper of the Palatine library. His master was the famous Alexander, surnamed Polyhistor, whom he is said to have imitated closely in his writings. Suetonius mentions that in his old age he fell into poverty, and was supported chiefly by the generosity of a rich consular named Licinius, who, with the poet Ovid, had been his most inti¬ mate friend in early life. The dates of his birth and death are alike unknown. Hyginus is frequently mentioned by Pliny and Aulus Gellius, and always with respect. Not one of his works has come down to us, and even of the titles only the following are known :—De Urhibus Italicis ; De Pro- prietatibus Deorum; De Virgilio Liber ; De Familiis Tro- janis ; De Agricultura. Another Hyginus, who has been quite unwarrantably identified with this one, has transmitted to us two works, entitled respectively, Fabularum Liber, and Poeticon Astronomicon, libri iv. The first of these is a collection of legends from the old mythology, some of which are presented under new forms; the title of the se¬ cond sufficiently explains its purport. Both of these works are written in a style so impure as to savour of the iron age ; but who their author was, or when he flourished, has been very much disputed. Some critics even declare that they are merely translated from the Greek. To this Hyginus also are attributed treatises De Castrametatione, and De Limitibus Constituendis, which have been several times reprinted. 2 A 186 HYGEOMETEY. rrygro- metry. A vast number of substances, such as sugar, flour, bread, &c., possess the property of absorbing moisture, the amount of which varies according to the circumstances in which they are placed. Atmospheric air also, and most gases, absorb and retain aqueous vapour, so that in all experi¬ ments regarding the composition of bodies it is necessary to ascertain their state as to dampness. The values of many commodities are greatly influenced by the quantity of moisture which they hold, and hence the utility of hav¬ ing some means of ascertaining this quantity. The word hygrometry (from vypos, moist, and /xerpov, a measure) signifies the measurement of dampness, and therefore serves to denote the assemblage of processes, by help of which we attempt to measure the humidity oi bodies. But the word is commonly restricted to atmosphe¬ ric hygrometry; and, indeed, is the only department which has received adequate attention from natural philosophers. When a substance capable of absorbing moisture is placed in damp air, it becomes gradually more and more humid, until a kind of equilibrium be established; that is, until the affinity of the air be so augmented, and that of the substance be so reduced, that no farther action goes on ; and, conversely, when a moist body is placed in dry air, the air abstracts the moisture until a hygrometric equilibrium re¬ sult. The humidity of the substance becomes thus an in¬ dex to the dampness of the air in which it is placed. By taking advantage of this circumstance} and of the changes which certain substances undergo when moistened, several experimenters have attempted to construct hygrome¬ ters ; but, as yet, no instrument of this kind has been con¬ trived which deserves a higher appellation than hygroscope, or indicator of dampness, and very few of them deserve even this name. Humidity, while it augments the weights of bodies, is observed also to change their volumes and forms. Thus, a sheet of paper expands very considerably on being moist¬ ened, and contracts again on being dried. Hence, in order to stretch a sheet of paper, we first moisten it thoroughly, and then paste it down, or glue down its edges, in order that when dry it may become tense. The varying length of a slip of paper would thus serve to indicate the dampness of the adjacent air, were it not that paper undergoes a per¬ manent change when much moistened, and that there is reason to think that the dust which penetrates its pores tends to alter its hygrometric properties. The variability of paper renders it very unfit for accurate plans; but no substitute has been found for it. The varia¬ tion in length from extreme dryness to extreme dampness, is about 1 in 42, but is different in papers of different makes. Every species of wood is liable to hygrometric changes, a circumstance which gives great trouble in carpentry. The change length-ways is small; but across the grain ot the wood the expansion caused by moisture is very great. Generally, the change in the breadth of planks cut radially from the tree is much less than that of planks cut tan¬ gentially. This is shown by the manner in which the trunks of trees rend on being dried; the radial fibres contracting much more than the circular ones, and hence producing only radial rents. On account of this great lateral contraction the pannels of doors are fitted into grooves so as to allow of some shrink; for if secured at the edges they would be liable to split. All organic substances contain pores expressly for the conveyance of their juices, and are influenced by the acces¬ sion of moisture, some of them very remarkably ; and at¬ tempts have been made to render the changes which they undergo subservient to the measurement ot humidity ; but, unfortunately, these changes are very precarious as to their amounts, while repeated fluctuations are found gradually to impair the sensibility of the materials. The hygrometer of Saussure is formed of a hair from which the oily matter has been removed by a gentle boiling in water containing one per cent, of the sulphate of soda. One end of the hair is fixed by pincers to an adjusting screw, and the other end to the periphery of a small pulley carrying an index, so that a minute change in the length of the hair may produce a perceptible motion in the index : a counterpoise is appended for the purpose of keeping the hair gently stretched. The whalebone hygrometer of Deluc is constructed on the same principle, but the sub¬ stance employed is a slip of whale¬ bone cut across the fibres. The instrument is shown in fig. 1. A slender spring keeps the whale¬ bone stretched. Captain Kater used the twdsted Indian grass called Oobeena Hooloo, which possesses the re¬ markable property of twining and untwining according to the damp¬ ness of the air. The manner of graduating these, and all hygrometers of this class, is to expose them for some time to air thoroughly dried, and then to air thoroughly humid, and to mark the two extremes of the scale, which is usually divided into 100 degrees. For the zero of the scale the air may be dried by means of concentrated sulphu¬ ric acid, fused chloride of lime, or any substance having a great affinity for moisture; and for the other extreme it may be moisten¬ ed by suspending linen rags well soaked in water inside of the re¬ ceiver, taking the precaution to wet its sides, and to place a sau¬ cer of water in it. None of these instruments, however, give consistent re¬ sults ; so that the whole of them have fallen into disuse as accu¬ rate measurers, although they do serve to give a rough idea of the state of the air in regard to moisture. It is well known that the temperature of a wet body is lower than that of a dry one exposed to the influence of the same air. Leslie applied this depression of tempera¬ ture to measure the dryness of the air; for this purpose he placed two delicate thermometers near each other, the bulb of the one being covered with moistened linen or paper, and that of the other being dry; the difference between the two was an index to the drying power of the air. The original instrument which he used was composed of two thermometers jointed together, and provided with three slender feet; it is in the possession of the writer of this article. Afterwards Leslie applied the far more delicate Hygro¬ metry. Fig. 1. HYGROMETRY. 187 Hygro- metry. Fig. 2. differential thermometer (fig. 2) to the same purpose; and his hygrometer is, perhaps, the most delicate instrument which f we possess for indicating the humidity of the air. This in¬ strument is formed by uniting two tubes having a ball blown on the end of each, and having a little tinged sulphuric acid previously introduced. The united tube is then recurved, as shown in the fi¬ gure, and by a little management the end of the column of acid is brought near to the upper end of one of the tubes. When both balls are at one temperature the instru¬ ment indicates zero ; and when one of them is covered with wet paper the instrument indicates the de¬ pression of temperature. Leslie graduated his hygrometers to show tenths of a centigrade degree. The indications of this instru¬ ment are very precise, and give definite information as to the state of the air; but it is evident that as it merely shows the amount of cold produced by evaporation, it is not strictly a hygrometer. The read¬ ings of the thermometer and baro¬ meter must also be taken before the quantity of moisture contained in the air can be computed. It has been proposed, as an improvement on Leslie’s hy¬ grometer, to place two thermometers side by side, the bulb of one of them being kept moist by capillary action ; this is only a return to the ruder and less delicate form of the instrument. Warm air is capable of holding in solution more mois¬ ture than cold air can, and hence, in order to ascertain the quantity of moisture corresponding to the reading of a Les¬ lie s hygrometer, we must observe the temperature of the ah, and deduct from the total quantity of moisture which air at that temperature is capable of holding, the deficiency made apparent by the degree of cooling. If, then, warm damp air be cooled sufficiently, it may be made to deposit its moisture: as soon as the air reaches that temperature, the moisture which it contains begins to be deposited on the surfaces of surrounding bodies, and dew is formed. Of this we have a familiar example in the dew which is formed on the surface of a jar containing cold water when it is brought into a warm apartment, particu¬ larly if the air of the room have been moistened by the breaths of a numerous company; and also in the water which trickles down the insides of our window-panes du¬ ring a cold night. Advantage is taken of this circumstance in the construc¬ tion of Daniell’s hygrometer or dew-point instrument. In its first form this hygrometer consisted of a widish tube ex¬ panded into a ball at each end ; a quantity of ether was in¬ troduced previous to the closing of the tube, which was so bent that the whole of the ether might rest in either ball: a small thermometer also was previously inserted, having its bulb half immersed in the ether when in one of the balls. The liquid was then made to boil, so as to expel all the air, and in this state the tube was closed. By this means a Wollaston’s cryophorous, on the small scale, was formed. On bringing all the ether into the one ball, and cooling, by any means, the other ball, the temperature of the ether could be reduced ; and if the cooling were carried sufficiently ar, dew was formed on the outer surface of the glass. The indication of the inclosed thermometer then gave the dew¬ point. 45 The general principle of this hygrometer is excellent 5 but some little defects in the detail of the operations ren¬ dered it somewhat uncertain. In order to produce a suffi¬ cient degree of cold, the empty ball was covered with a piece of linen or silk, on which was poured a quantity of ether, and the observer had to watch the instant when the dew began to be deposited on the glass. In this way time could not be allowed for the glass, ether, and thermometer bulb to come all to one temperature, and the indication of the thermometer was therefore influenced by the rapidity or slowness of the cooling. Dr Gumming, Professor Connell, and M. Regnault seve¬ rally made contrivances for remedying this inconvenience ; these are all founded on the same principle, and as that of M. Regnault seems best to accomplish the desired effect, we shall confine our observations to it. M. Regnault’s condenser hygrometer (fig. 3), as it is called, consists of a cy¬ linder or thimble, made of very thin silver, and highly polished, 2 inches deep and ^ths of an inch in dia¬ meter. This is fitted tightly on a glass tube, cd, open at both ends. The tube has a small lateral tubu- lure,<, near the up¬ per end. The up¬ per end of the tube is closed by a cork, through the centre of which the stem of a very sensible thermometer is passed. The bulb of the thermome¬ ter is in the centre of the silver thim¬ ble. A very thin glass tube, fg, open at both ends, passes through the cork, and descends almost to the bot¬ tom of the thimble. Ether is poured into the tube cd as high as to mm, and the tubulure t is placed in communication with an aspirator jar, six or eight pints in capacity, or with a small circular ex¬ hausting bellows, by means of the upright supporting pillar H and the flexible tube /, which is furnished with a stop-cock. On allowing water to run from the aspirator jar, or on opening the bellows, air passes down the tube gf, and rises in bubbles through the ether, which is cooled by the induced evaporation. The refrigeration is the more rapid the more freely the air is made to pass, and the whole mass of ether is of a uniform temperature as it is briskly agitated by the passage of the bubbles of air. The temperature is suffi¬ ciently lowered, in less than a minute, to cause an abundant deposition of dew. By regulating the supply of air, the thermometer may be kept readily at any required temperature less than that of the external air. Now the object of the observer is to dis¬ cover at what exact temperature the dew begins just to be formed. When, therefore, he has obtained a copious depo¬ sition on the bright surface of the silver, he reduces the supply of air so as to allow the thimble to be warmed and the dew to disappear; he then augments the supply of air Hygro- metry. 188 H Y M Hvmettus again to cool the silver cautiously till the dew reappear. In || this way he can ascertain the dew-point true to the tenth Hymn, part of a degree of Fahrenheit’s thermometer. T he obsei ver / must remain at a distance from the apparatus, in order that the warmth of his body, and the humidity of perspiration, may not derange the results ; a small telescope or opeia- glass may be used to read off the degiees. Less ether is needed with this instrument than with the original form of Daniell’s hygrometer, and, unless when the’air is very dry, the ether may be replaced by alcohol. In order to measure the temperature of the air, another apparatus exactly similar, but containing no ether, is placed under the influence of the aspirator. These two, the wet-bulb and the dew-point hygrometers, are the only instruments which have yet been contrived for giving definite information as to the humidity of the atmosphere ; but neither of them indicates per se the quantity of moisture contained in a given volume of air; that quantity can only be ascertained by help of carefully conducted experiments. Our knowledge of this branch of the subject is extremely limited, and the attention of scientific men is at present directed to the law which connects the indications of the dew-point and wet-bulb hygrometers. H Y M For this purpose the simultaneous readings of the two instruments, of the thermometer and barometer, are all ob¬ served under as great a variety of circumstances as possible. It is to be regretted, however, that in making these com¬ parisons an attempt is made to discover the ratio between the depressions of the dew-point and ot the wet-bulb below the temperature of the air; a formula of the form T-t=f(T-t') being used, in which T is the temperature of the air, t that of the dew-point, and i that of the wet-bulb ; f being a coefficient, the values of which corresponding to different values of T are sought to be ascertained. Now one may easily see that when the air is nearly saturated with mois¬ ture both of the depressions T —t and T —t must be small; but it does not follow that they are proportional to each other ; for if we imagine the air to be nearly dry, the wet- bulb hygrometer will be nearly at its maximum reading, while the dew-point instrument has, so to speak, no maxi¬ mum, since, when the air is perfectly dry, no conceivable lowering of temperature can ever cause it to deposit mois- ture. The discussion of these matters, however, belong to the subjects of Meteorology and Evaporation, to which ar¬ ticles the reader is referred for further information, (e. s.) Hymn. HYMETTUS, a celebrated mountain, or rather amoun- tain range of Attica, forming the S.E. boundary of the Athenian plain. It consists of two separate parts, the north¬ ern or Greater Hymettus, now called Telo-Vuni, a.nd the southern or Lesser Hymettus, described by the ancients as Anhydrus, or the Waterless, and now called Mavro- Vuni. The highest point of Hymettus is 3506 feet above the level of the sea. The honey of Hymettus was regarded by the ancients as only inferior to that of Hybla; and the classics abound in allusions to the excellence and beauty of its marble. (See Attica.) HYMN, a sacred ode, adapted in its original design to re¬ ligious services of a public character. T he primary idea of the hymn was adoration ; but its specific meaning and pur¬ pose have been gradually extended, till the name has come to be applied to all classes of devotional compositions treated in the shorter metrical forms. Hymns were an important feature in the religious festivals of the ancient world. The classic mythology, that wonderful product of the legends of an imaginative people, yielded rich materials for poetical treatment; and numerous specimens of the lyric ode, sung in temple and theatre amidst music and choral dances—the exulting paean, and shrill, maddening dithyramb—are pre¬ served in Greek and Roman literature. These ancient hymns are of three kinds—The theurgic or religious, as the so-called hymns of Orpheus, which weie chanted by the initiated in the mysteries ; the poetic oi popular, which celebrated the fabulous adventures of gods and heroes, as the hymns of Homer and Callimachus, Pin¬ dar and Horace ; and the philosophic, in which the esoteric tenets ofthe schools were presented under religious symbols the homage of speculative intellect to popular belief. The hymn of Cleanthes is a lofty theosophic prayer to Zeus for light and wisdom, in the style of Milton’s invocation to Urania. But it is in the sacred poetry of the Hebrews that we find the perfect development of the hymn. In the odes of Moses and Deborah, there is a higher and purer inspiration than that of Aonian mount and Castalian spring. Daily, in the temple of Jerusalem, bands of priests and Levites with alternate voices chanted psalms in which saintly genius had been consecrated to the noblest ends. These psalms, chiefly composed by David, continued to be employed in the more spiritual worship of the Christian Church. They formed the language of its earliest praise, as they found in its faith their clear and full interpretation; and on this an¬ cient and sacred basis has the whole superstructure of Christian hymnology been raised. At what period hymns distinctively Christian were intro¬ duced into evangelical worship cannot be exactly asceitained. The apostolic writings speak of “ psalms and hymns and spiritual songs;” and the last of these expressions has been supposed to refer to the doxologies or fervent strains of thanksgiving uttered by those who possessed spiiitual gifts.^ We learn from Philo (De Vit. Contemplate that hymns ot their own composition were used by the Essenes or fhera- peutse, a sect of Jewish ascetics, in their religious assemblies. Michaelis and others think they discover fragments ot apos¬ tolic hymns in such passages as Eph. v. 14; 1 Tim. in. 1, 16; 2 Tim. ii. 11, which have a kind of rhythmical flow. We have the testimony of Pliny, in the famous letter to Trajan, early in the second century, that the Christians “ repeated hymns among themselves to Christ, as to a god. An early Christian writer remarks, that “the praises of Christ, the Word of God, were set forth in psalms and hymns of the brethren, written at the beginning” {Eusebius, \\b. vii. c. 28). Three ancient Greek hymns, transmitted to us in the Apostolic Constitution, are supposed by Bun¬ sen, a competent authority, to be the sole authentic speci¬ mens we possess of the ante-Nicene psalmody and hymn- olooy. The first of these, the Gloria in Excelsis, com¬ monly termed the “ Morning Hymn,” forms part ot the communion service of the Anglican Church. Another, a Hamn at the Lighting of the Evening Lamp ( Y/xvos tov AuyvikoS), is an interesting relic of the simple devotion ot the early Christian household. The first writer known to have composed hymns for the worship of the Western Church is Hilary, bishop of Poitiers, who died a.d. 5bS. About the same time Ambrose introduced choral singing into the church of Milan, and wrote the Te Deum--* mag¬ nificent composition, moving in the majestic cadences o the Hebrew psalm. But both hymns and choir-song had existed from a much earlier period in the Eastern Churcti. A specimen of the Greek hymn, the earliest known, is found in the writings of Clement of Alexanaria, whoflounsie in the beginning of the third century {Paedag. lib. in., ad Jin.) Gregory of Nazianzus, towards the end of this century, acquired reputation as a writer of hymns. 1 he genera 189 H Y Hymn, diffusion and influence of the earlier hymns may be inferred from the fact of the heretical sects availing themselves of the popular taste in order to disseminate error. Arius wrote songs “ for the sea, and the mill, and the highway, and set them to music.” These rude chants materially promoted the spread of his doctrine. Chrysostom found Arian can¬ ticles in great esteem at Constantinople, and combated their tendencies by counter-hymns in defence of the Catholic doctrine. The Gnostic Bardesanes imitated the Psalms of David, not only in style and structure, but in number. He composed 150mystical hymns; in these pseudo-psalms “pre¬ senting to simple souls,” says Ephraem Syrus “ the cup of poison tempered with seductive sweetness.” This false coin¬ age shows the currency of the genuine metal; and Jerome tells us that in his day “ you could not go into the fields, but you might hear the ploughman at his hallelujahs, the mower at his hymns, and the vine-dresser singing David’s Psalms.” In the 4th Council of Toledo, a.d. 633, the use of hymns was formally sanctioned by the Western Church. Most of the hymns for the festivals of saints and martyrs had been written at a much earlier period by Prudentius. We find some great names of the Latin Church in the list of its sacred minstrels;—Popes Gelasius and Gregory, Paulinus, Venantius Fortunatus, Bernard, Anselme, Bede, &c. The famous hymn of Thomas Aquinas—Pange, lingua, gloriosi— fixes the epoch of transubstantiation, the point at which the rhetoric of the pulpits froze into the logic of the schools— “ Verbum caro, panem verum Verbo carnem efficit; Fitque sanguis Christi merum, Et si sensus deficit Ad firmandum cor sincerum Sola fides sufficit.” The great harvest of hymns was produced from the eleventh to the thirteenth centuries in the Gallican and German clois¬ ters. Many a monk employed himself, in the interval of inditing palimpsests and illuminating missals, with stringing together leonine triplets and sextains. The constant perusal of the Fathers strengthened this tendency. In the prose of Au¬ gustine we are struck by the frequent recurrence of rhyth¬ mical cadence and balanced antithesis. It was the delight of the monkish versifiers to compress hard theological for¬ mulae into pithy epigrams, and set them to a rough jingling music. The learned Benedictines of the congregation of St Maur specially laboured in this vocation, and weeded the service-books of many puerile and barbarous ditties (vide Leysser, Polycarp. Hist. Poet, et Poem, medii cevi). Some of the best Latin hymns are anonymous, as the Coelestis urbs Jerusalem, long a favourite in Scotland (“ O mother dear Jerusalem”), though the original maybe found in Augustine’s Meditations ; In abysso Deitatis, and Veni Creator Spiritus, translated by Dryden. The Dies Irce was composed by Thomas von Celano, a Minorite friar, and the Stabat Mater is ascribed to Jacopone. The Reformation was accompanied by an outburst of song on the part of the people throughout Christendom. The altar-screen which fenced the priestly caste from laic intrusion was broken down. Instead of canons or friars in¬ toning drowsy antiphons in the choir at the hours of prime, sext, and compline, the Reformed congregations, young men and maidens, old men and children, were heard with loud voices praising God. Translations of the Psalms prepared the way for hymns which popularized the tenets of the Evangelical Confessions, and became to the religious life of the Protestant communities what the ballads of a nation, according to Fletcher’s maxim, are to its political life. In Luther’s hand “ the thing became a trumpet.” His hymn Em’ feste Burg ist unser Gott, has been called by Heine the Marseillaise of the Reformation. In striking contrast with the number of hymns elicited M N. by the great religious awakening on the Continent, is their Hymn, comparative scarceness in the early Protestant literature of y^»- England and Scotland. We know that in both countries religious canticles were adapted to old and favourite tunes, and widely diffused, but they were never so thoroughly assimilated with the religious life of the people, and incor¬ porated with its ritual, as in Germany. The sublime poetry of the Bible satisfied the popular heart, while it nourished the intellect and imagination ; and the psalms of the Jewish temple were sung with clearer emphasis and fuller response in the Christian sanctuary. The hymnology of British Pro¬ testantism may be said to be the growth of the last century and a half, before which period Germany possessed a classic literature of sacred song. The rude English version of the Psalms by Sternhold and Hopkins was superseded by that of Brady and Tate—a sacrifice of rugged strength to in¬ sipid smoothness and inflated verbosity. Milton’s attempts at translation only show that his strong arm could not bend the bow of Ulysses. The Scottish version, though in re¬ ality the work of an English Puritan, has, with all its rough¬ ness and dissonance, preserved more of the vital spirit, the rich and pure aroma of the Hebrew original. The sacred poems of Herbert, Quarles, Vaughan, and other writers of that period, cannot be accepted in the strict sense as hymns. A few written by Mason, who died in 1694, more justly deserve the name. They are often quaint and harsh in diction, but compact with thought, and luminous with imagery. The hymns we have from Addison’s pen are marked by elegance and refinement, and devoutness of feeling, though his muse stands in the outer court of the temple. Tried by the test of popularity—here a true cri¬ terion of excellence—one of the highest places must be assigned to those of Watts. He is our most voluminous writer, and though his effusions are occasionally deformed by conceits and false ornament, they are often lofty, im¬ passioned, and felicitous in expression, while, above all, the living spirit of devotion breathes in every line. More simple and spontaneous are the hymns of Doddridge, with the same sacred warmth and glow. The numerous hymns of Charles Wesley are distinguished by the predominance of the subjective and emotional elements. Everywhere they are stamped with a fervid individuality, which verges at times upon vagueness and mysticism of the Moravian type. The hymns of Toplady, the great antagonist of the Wesleyan theology, are often charged with dogmatic state¬ ment to a degree of prosaic stiffness and austerity; but some of them, in their simple energy and fulness, and a kindling ardour which reminds us of Wesley, have obtained general currency. One of the most popular collections is that known as the Olney Hymns, the joint production of Cowper and John Newton. Newton’s hymns are sound, vigorous, and sensible presentations of Christian truth, penetrated and vivified by deep Christian experience; while those of Cowper, by their tenderness and truth, their touching per¬ sonal allusions, solemn saintliness, and sweet imagery, have made their way to the universal Christian heart. Two of Logan’s hymns in the Scottish Paraphrases take rank with the finest in the language. Among more recent writers may be mentioned the names of Beddom, Steele, Jane Taylor, and, above all, James Montgomery, who exhibits some of the highest excellencies of a sacred lyrist. His lines on prayer are household words. The Christian Year, by Keble, may be noticed as having contributed, equally with the Tracts for the Times, to the success of the Anglo-Catholic reaction in the Church of England. In these pensive, dreamy, soothing strains, we have the logic of the Oxford schools turned into rhetoric. The academic cloister and the Gothic aisle are the “haunt and main region” of his song. 1 he white Levitical vestment is his singing- robe, and you listen in the dim religious light to a music like the lulling chime of church-bells. 190 H Y M Hymn. The Lutheran Church may be proud of her hymnolc^ty. Those who wish to see the flexibility, compass, and amu- ence of the noble German speech may look foi it there. Her singers have swept every string ot the many-choided ]yre _sounded the full diapason from heights of aerial rap¬ ture’ to depths of penitential sorrow. Most of her great writers have cast their shekel into the temple-treasury. Goethe in his last days regretted having made no contribu¬ tion to her sacred song; but his was the loss, not hers. The Reformation period, and that immediately succeeding, are illustrated by the names of Luther, Justus Jonas, Nico¬ laus Decius, Herberger, Schalling, Nicolai, and many others. The Thirty Years’ War gave birth to the Kreuz- und Trost-Lieder, songs of trial and comfort, by men like Neumark, Albinus, Joachim Neander, Paul Fleming, and Paul Gerhardt. Her later poets have not attained to the rank of the first, though names like those of Tersteegen, Zinzendorf, Gellert, and Klopstock, have inscribed themselves indelibly on her annals. During the period when Rational¬ ism ruled in her schools and pulpits, an attempt was made to tone down the rich evangelic colouring of the Gesang- buch to the dead neutral tint of the dominant Neology. This process of dilution was known as “ Gesangbuchs Yerwasse- rung,”—hymn-book watering,—but it did not succeed, and the sound doctrine and fervid devotion of the old hymns remained to protest against, not seldom to counteract, the petrified theology of the pulpit. Among modern writers may be mentioned the names of Novalis, Arndt, Hiller, Spitta, Knapp, &c. The comparative poverty of the classic literature of France in hymns is striking when contrasted with its rich¬ ness and fecundity in other departments. The Gallican Church continues to intone its praises in the old sacred lan¬ guage of the Vulgate and the Breviary,—the Sanscrit of the Western ritual;—while the Reformed Church has for the most part remained faithful to its simple version of the Ca¬ nonical Psalms. 1 he first translation of the Psalms by Clement Marot in the earlier half of the sixteenth century marked an epoch in the religious history of France. Ihe sacred words wedded to native melodies found an echo in the heart of the nation. The king hummed them as he rode to the chase. The burghers of Paris sung them in crowds in the Pre aux Clercs; and the sweet music was heard in the vineyards of Provence, and among the mar¬ ket-boats of the Loire and Rhone. This famous version, retouched and completed by Beza, made a way through France for the triumphal progress of the Reformed theology. The sacred compositions of Mad. Guyon are well known to English readers through Cowper’s translation. Though a member of the Romish communion, her writings are sin¬ gularly free from its peculiar tone and bias. We find in them deep Christian feeling, aspiring fervour, and chastened emotion ; often a sweet and tender simplicity, illumined with a pure, still fire of contemplative devotion. It is the pious, but too introverted spirit of Thomas a Kempis flow¬ ing into the poetic mould, and, as in the Imitation, the thought often shines dimly through a soft warm haze of sentiment. The keen scent of the Jesuits (odora canum vis) soon detected in these effusions the taint of Quietism— that vague suspicion which threw a shadow on the reputa¬ tion even of Fenelon. In later times, the Catholic mis¬ sionaries have availed themselves of the influence of vernacu¬ lar hymns among the common people, and combated Pro¬ testantism with one of its own weapons. Simple rhymes or cantiques in honour of the Virgin and the saints are a distinctive feature of these missions, and hold the same place in France as the laudi spirituali in Italy. Among hymn writers of the Reformed Church the most voluminous and best known is Caesar Malan of Geneva. To the higher qualities of the poet this writer makes no pretence, but his hymns are characterized by ardent utter- II Y P ance of devout feeling, and clearness of doctrinal statement, Hypatia, in fluent and unaffected verse. The list of her sacred lyrists, though small, includes the great name of Vinet. He has written little, but left on his hymns the stamp of his powerful intellect, genial heart, and all-pervasive spiri¬ tuality. After all it may be doubted whether the genius of the French language, with all its grace and pliancy, lends itself with such facility as the sister tongues of Germany and England to the grave and simple measures of the hymn. (See Bunsen’s Versuch eines allgemeinen Gesang-und Ge- betbuchs.) A full collection of Latin mediaeval hymns has been recently published at Freiburg, in Baden, by M. Mone, librarian at Carlsruhe. (J* D* Bi) HYPATIA is one of those whose names are glorified rather by wrongs than by merits; and had she not died, few would now know, and fewer care, whether she ever lived. The facts which remain concerning her are these, as far, at least, as we can trust an age in which historians, philoso¬ phers, and priests, were equally careless of facts. In the year a.d. 415 (or more probably 413) there was at Alexandria a maiden, beautiful, eloquent, and a great mathematician, according to the standard of those times. She seems also to have been possessed of some political genius, for Orestes, the prefect of Alexandria, did nothing without consulting her. She was the reigning star of the then Alexandrian school of Neo-Platonism, and was possibly the instructress of Syrianus, who, after the victory of the Christians, migrated to Athens, and became the spiritual father of the famous Proclus. Proclus, then, may be considered as the ultimate develop¬ ment of Hypatia’s teaching: what it was in itself, we know^ not. As an orator, she seems to have been the outcome of that school of Neo-Platonism in which, under the Emperor Julian, Maximus, Libanius, and their contemporaries, tried without effect the force of preaching as an antidote to the popular and powerful sermons of the Christians. As a com¬ mentator on the geometry of Apollonius and Diophantus, she may have had leanings toward that earlier and finally victorious school, which attempted, under the teaching oflamblichus, to discover in a priori physical science a symbolism which might express a priori spiritual truths. A similar movement among men of feminine minds arose in the seventeenth cen¬ tury, when Bohmen, Van Helmont, Eugenius Philalethes, and other theosophists, attempted at once to justify their mysticism (far purer and nobler than that of the Neo-Plato- nists) by proving its analogy with the supposed laws of the material universe, and to preserve the already decaying a priori science of the middle ages. In both cases the at¬ tempt was a sign of approaching and inevitable death to the systems of thought which it advocated, whether physical or spiritual. Doubtless there is an analogy between the phy¬ sical and the spiritual worlds. The instincts of all ages and races, whether materialist or spiritualist, have assumed and acted on the postulate. It remains for some future age, if not to discover, at least to prove by experiment, that the analogy must be worked out by investigating the spiritual world, on the only method henceforward allowable in the physical one, namely, on the inductive method. Whatsoever, therefore, Hypatia’s opinions may have been, her work in the world must have been very insignificant, ex¬ cept in as far as a chaste and high-minded woman, however illogical, is certain to instil into her hearers something ot her own purity and loftiness. To this influence of hers we should attribute the intense veneration which Synesius, bishop of Cyrene, evidently felt for her. In his most amusing letters, there are some six addressed to her. I hey are, or the most part stilted and artificial, as written to a person ot artificial character, self-conscious herself (as were all her school), and demanding self-consciousness in others; despis¬ ing simple nature, and requiring art as the token of supra- HYP Hypatia, human education. But one or two really pathetic passages in them show that Hypatia was one to whom (if merely in virtue of her woman’s heart) Synesius could pour out his most real and human sorrows, sure of sympathy, if not of comfort. These letters, indeed, with the tone of chivalrous admiration which they breathe, are among the most interest¬ ing documents of the age ; and indicate, with the JEthiopics of Heliodorus, and even the Pastorals of Longus, that there were men here and there, among the ancient and dying races of the South, who were approaching, for good and evil, the mediaeval form of thought as to the relation of the sexes. Hypatia herself, however (if we are to credit Suidas), carried to an extreme the Manichaean disgust of sex com¬ mon to Neo-Platonists and to monks. Her method of riddino- herself of a certain unfortunate lover is probable enough, but too gross to quote. Those who may read it in the ori¬ ginal will do well to remark (unless the histories of Popish saints have already taught them) how near the limits of sentimental prudery are to those of shameless cynicism. The story of Hypatia’s having been married to Isidorus seems an utter mistake of Suidas. He cannot mean Isi¬ dorus of Gaza; the man who became head of the Athe¬ nian school after Proclus and Marinus must have been born after Hypatia’s death ; for she died a.d. 413 or 415, ac¬ cording to Socrates; and Proclus (if Marinus, his pupil, may be trusted) was born a.d. 412. Photius merely says that Isidore surpassed Hypatia, “as a man a woman.” The assertion that he was her husband is a mere note of the edi¬ tion of 1620-30. But the chief argument against her mar¬ riage is to be found in Synesius’ letters, in which he re¬ peatedly begs to be remembered lovingly to her father Iheotecnus (not Theon, as he is usually called), to her brother Athanasius, and to other friends ; but makes no mention either of a husband, or of any Isidorus. And the known tendencies of the school make it most improbable that such a woman should have degraded herself in her own eyes so far as to become a wife. Her tragedy is well known by the account of Gibbon, diawn from Socrates, bk. vii., § 15 ; and from Theodoret, who asserts Cyril’s complicity. Theodoret knew Cyril well enough to suspect him of anything; at least, to say of him, after his death, that “ the only fear was that hell would find him too unpleasant a guest, and send him back to earth.” And certainly all we know of him justifies the sneer; at least, it seems certain that Cyril protected her murderers. Hypatia’s death seems to have happened thus:—The minds of the Nitrian monks, and of the Alexandrian populace, had been inflamed by her intimacy with Orestes, the prefect, who was at open war with Cyril. Hating her both as what she was, the championess of an eclectic Polytheism ; and as what she was not, a profligate woman, they laid wait for her at the door of that lecture-room in the Mouseion, where (to the envy of Cyril) her admirers’ chariots and slaves were wont to wait. She was seized, stript naked, dragged into the Kaisareion (then a Christian church), and torn piece¬ meal, with fragments of shells and pottery. The flesh was scraped from the bones, and what remained burned in the Kinaron. Thus ended, or seems to have ended, the last noble wo¬ man whom Greek paganism produced. Her letter to Cyril, regretting Nestorius’ banishment, must be considered as a mrgery ; for Nestorius was not banished till a.d. 436, and Socrates gives too detailed and honest an account of her death to be far wrong. But, indeed, Hypatia is at best but a myth and a shade ; and two centuries more saw her trans¬ figured into the famous Saint Catharine of Alexandria ; the Christians whom she opposed into pagan philosophers confuted; Cyril into Maxentius the persecutor; the pot¬ sherds of the Kinaron into the toothed wheels miraculously broken by lightning from heaven ; and Hypatia installed for a thousand years to come as one of the four virgin saints HYP 191 of Christendom. So does the whirligig of Time bring round Hyperbola its revenges; and every noble soul, even under a feigned II name and circumstance, has its nobleness acknowledged, IIyPerbole- and does—not the work which it intended, but the work of which it was really capable. (c. K.) HYPERBOLA, a curve formed by cutting a cone in a direction parallel to its axis. See Conic Sections. HYPERBOLE, a figure of speech of very frequent oc¬ currence both in written and oral discourse. As its etymon implies, it signifies a shooting or throwing beyond or over the mark. Popularly, it denotes an over-shooting of the truth in the description of anything by exaggerating qua¬ lities that really do exist in it without introducing new ones. Bolingbroke cleverly alludes to it as a figure that lies with¬ out deceiving. Hyperboles diminish as well as exaggerate ; but though there are many good instances of diminishing hyperboles, most writers succeed better in those of the op¬ posite kind. A good illustration of a diminishing hyper¬ bole is that quoted by Longinus from a comic poet who de¬ scribes a character in one of his plays as “ possessing an estate smaller than a laconic despatch.” Talking of a&thin man, Shakspeare describes him as “ so gaunt, the case of a flagellet was a mansion for him.” Swift, describing a lion of more than ordinary fierceness, says of him :— He roared so loud, and looked so very grim, That his own shadow durst not follow him ! ” Hyperbole is a favourite figure with the poets of all times and nations. In the specimens of ancient Oriental prose that have reached us, we find numerous examples. In the Tal¬ mud, for instance, a man hewing wood beside the pool of the Jordan, is asked if the water is deep there. “ So deep,” he said, “ that an axe-head of mine which slipped in there seven years ago has not yet reached the bottom.” The poetry, and even the ordinary conversation of Oriental na¬ tions are, for the most part, mere tissues of hyperbole. To the less warm imaginations of the West, they sound bom bastic and even absurd; and if taken literally, they un¬ doubtedly are so. When analyzed, however, they are found to be hardly more extravagant than those that pass current among moderns without creating the least surprise. Our most ordinary compliments are, in this way, as truly hyper¬ bolic as the highflown civilities of the East. How far hyperbole may be carried cannot be fixed by any precise rule. Good sense, and a refined taste, will best determine beyond what point it becomes absurd. Lon¬ ginus compares a hyperbole carried too far, to a bow-string w'hich relaxes by overstraining, and produces an effect op¬ posite to what is intended. Few English writers err so much in this respect, and seemingly in mere wantonness, as Shakspeare:— “ Three times they breathed, and three times did they drink, Upon agreement, of swift Severn’s flood ; Who then affrighted with their bloody looks, Ran fearfully among the trembling reeds, And hid his crisp-head in the hollow bank, Blood-stained with these valiant combatants.” And again:— “ His brandish’d sword did blind men with its beams ; His arms spread wider than a dragon’s wings ; His sparkling eyes replete with awful fire, More dazzled, and drove back his enemies, Than mid-day sun fierce bent against their faces.” Milton is often as guilty of the same offence: “ Me miserable ! which way shall I fly Infinite wrath, and infinite despair ? Which way I fly is hell! myself am hell! And in the lowest deep a lower deep Still threatening to devour me opens wide To which the hell I suffer seems a heaven.” Pope himself sometimes forgets his good taste “ • • • • Swift Camilla scours the plain ; Flies o er the unbending corn, and skims along the main.” HYP Probably, however, there never was a writer who did not occasionally lapse into hyperbole. As a general rule, to , •x. TTlf.v i1p s"ait\ t]iat every parable, proverb, epigram, oi bon mot to say nothing of the utterances that form what has been called the “ small change” ot books and social life, is HYPERIDES, a celebrated Athenian orator, one of the ten comprised in the Alexandrian Canon, was the contem¬ porary, and sometimes the friend, sometimes the enemy of Twisthenes The date of his birth is not accurately known; but it probably fell within the first decade of the fourth century b.C. After studying philosophy under Plato and oratory under Isocrates, he began his public career as an advocate in the Athenian courts of justice. When it became necessary for him to choose a pohtica creed he joined the patriotic party, at that time led by De¬ mosthenes and Lycurgus. To this choice he clung throng life, reckless of the hardships it entailed. In proof of his sincerity he fitted out two triremes at his own expense for the Eubcean expedition of b.C. 358. His whole public life, for the next twenty years, was spent in devising means ot re¬ sistance to the growing power of Macedonia. In b.C. 358, when the disastrous fight of Chmronea laid Greece at the mercy of the victorious Philip, Hypendes proposed that the citizens should rise en masse, send their wives and children to places of security, and fight it out to the last. Though this desperate advice was not taken, the genu¬ ine patriotism of the advice was appreciated and rewarded by his countrymen. When the death of Philip revived the hopes of the anti-Macedonian faction, Hyperides pro¬ moted the alliance with Thebes; and after the destruction of that city by Alexander, was one ot the orators demanded of the Athenians by the young victor. Alexander, how¬ ever, did not press his demand, and Hyperides continued to oppose the Macedonian influence as strongly as ever. 1 he arrival in Athens of Harpalus, the run-away treasurer of Alexander, then absent on his eastern conquests, disturbed the friendly relations that had hitherto subsisted between Hvperides and Demosthenes. Harpalus had embezzled some 5000 talents of the public money, with which he en¬ deavoured to organize a party for himself among the Athe¬ nians. It was believed, that among others, Demosthenes had yielded to his bribes and specious stories, and Dypen- des, who had shown himself proof to these temptations, either voluntered, or (as is more likely) was selected to prosecute his ancient friend. This, as was natural, led to a rupture between them which was not healed for some time. In the Lamian War, which followed the death of Alexander, Hyperides took a leading part; and when it was brought to a close, spoke the funeral oration over his countrymen who had perished in battle. ,11S orf'10n’ of which considerable fragments are preserved in btobaeus, was looked upon as a masterpiece by the ancients them¬ selves. The following year (b.C. 322) saw the hopes of Athens finally crushed at the battle of Crannon. Ihe chiefs of the patriotic party sought safety in flight. Hy¬ perides was overtaken at Angina by the minions ot An¬ tipater and cruelly put to death. Seventy-five orations were attributed to Hyperides; but a third of these wei e rejected as spurious by the ancients themselves. Westei- mann has preserved the titles of sixty-one of these in his History of Greek Oratory. Hopes have been entertained at comparatively recent periods of recovering the bulk of the authentic speeches. In the beginning of the seventeenth century, a German scholar professed to have seen a com¬ plete copy of Hyperides in the library of the Hungarian king Matthias Corvinus at Ofen. Taylor, the editor of Demosthenes, gave out that he had been similarly fortu¬ nate ; but as neither of these scholars turned their good luck to account, it has been concluded that they were both mistaken. In 1847, however, the hopes of the learned II Y S were revived by the tidings that the famous speech against Hyphasis Demosthenes, or, at least, very considerable fragments of II it, had been discovered. It turned out that Mr A. C. Har- ^ • ris, an English gentleman resident in Alexandria, when in- “ v'*- quiring at Thebes, in Upper Egypt, in the spring of 1847, for Tahidic fragments, had been shown some broken Gree papyri by a dealer in antiquities, and had purchased them. The papyri themselves were of the better kind, and were pronounced by the able scholars to whom they were sub¬ mitted, to date from a very remote antiquity. The evi¬ dence seemed complete that they could not be later than the third century of the Christian era, while there was a strong probability in favour of a still greater age. ie Cambridge editor, Mr C. Babington, inclines to the belief that they may be referred to the age of the Ptolemies. What the value of the oration itself may be, it is possibly some¬ what premature to pronounce. It certainly contains the bulk of the evidence on which Demosthenes was banished from his country, but the question of the great orator s guilt is one on which Droysen and Niebuhr, Mitford and Thirlwall, have come to opposite conclusions; and though t e recovered oration is a valuable contribution to the history o the time, as well as to Greek philology, it is still too mu¬ tilated to be finally decisive. How the MS. came to be found in Thebes, is itself, at first sight, somewhat of a mys¬ tery. It is believed that its Arab discoverer found it among the tombs in that city, and that it had been burie there with a mummy. Mr Harris, however, states that the MS. “ is unique among the contents of the tombs ot Thebes ;” but endeavours to account for its existence there bv saving, that “when we reflect on the numbers of rhe¬ toricians, philosophers, and literary men, who used to flock from Greece as well as Rome to the banks of the Nile, and notice a practice that prevailed in that country of burying writings with the dead, our wonder ceases ; and we begin to entertain legitimate hopes that the discovery of this oration may be followed by that of portions, at least, of many of the lost works of antiquity.” These hopes, however, have not, in the meantime, been realized, (bee The Oration of Hyperides against Demosthenes respecting the Treasure of Harpalus, by Churchill Babington, M.A., London, 1850. There is also a good German edition ot the oration by Schneidewin, Gottingen, 1853.) HYPHASIS, now the Sutledge, one of the five rivers of the Punjab. See Punjab. HYPOCHONDRIASIS, may be described as an ex¬ treme sensibility of the nervous system, usually attended with symptoms of dyspepsia, as flatulence, eructation, a sense of uneasiness in the region of the stomach, and hy¬ pochondria, and almost always with lowness of spirits, which makes the patient believe himself to be much worse than he really is. The morbid feelings of the hypochondriac are real depending on physical disturbances of the system; but the nervous apprehension of the patient causes him to dwell on them, and magnify them into undue importance. Attention to diet and exercise is the most important part of the treatment of hypochondriasis, together with with¬ drawal from those studies, pursuits, or habits, which appear to have led to the formation and development of the disease. Occasional gentle laxatives and tonics may also be required, but these should only be taken under medical advice. HYSTERIA, from varepa, the womb, though common y applied to those violent fits which attack women, and which are attended with convulsions, a sense of choking, and in¬ voluntary laughing and crying, is strictly applicable to a laro-e proportion of those chronic, so-called nervous, disorders to which females are subject. Of these the fit or convul¬ sion is but the occasional and prominent symptom. Ihe ht itself is usually preceded by a general uneasiness and feeling of oppression, a tight sensation about the throat, headache, cramps, and the sensation of a ball rising from the stomach HYP Hypostasis, to the throat (globus hystericus). A temporary loss of sense ' and consciousness, with general convulsions, screaming, tear¬ ing the hair, beating the breast, or otherwise attempting to injure the person, follows this, and the paroxysm passes off in a fit of laughter, or alternate laughter and crying, or a flood of tears. It is of great consequence to distinguish this dis¬ ease from epilepsy, with which it may be confounded. In epilepsy there is no premonitory symptom, as a sensation of ball rising to the throat; a sharp cry or shriek always imme¬ diately precedes the convulsions, and on the convulsions passing off the patient falls into a deep sleep of shorter or longer duration. Uterine and gastro-intestinal irritation or irregularity are the principal causes of hysterical affec¬ tions. They are consequently almost alone met with in females; but one or two well authenticated cases have been seen in males of highly susceptible nervous tempera¬ ment. During the fit the attendants should take care that the patient does not injure herself, but further than this they should exert no restraint upon the person. To prevent her injuring herself with her teeth, several folds of a towel or napkin may be put between the jaws. If there be much determination of blood to the head, the applying cold wetted cloths to the head, and sprinkling cold water on the face and throat, are recommended as useful; and in slighter cases, cold water sprinkled over the face, and applying smelling-salts to the nose, are thought to shorten the fit. Between the paroxysms means should be used to remove the cause of the disorder; and tonics, particularly prepara¬ tions of iron and quinine, regulation of the bowels and the secretions, and attention to diet and exercise, are the mea¬ sures most likely to restore health when the complaint, as it usually is, is attended with various degrees of debility. Assafoetida, valerian, ammonia, and other antispasmodics are also useful in preventing the recurrence of the con¬ vulsions. HYPOSTASIS, in Theology, a word employed to de¬ note the personality of the Second Person of the Trinity. The word employed by the Greek fathers to denote the Godhead, without reference to the distinction of persons, was ovaia (essentia). Substantia was, by the Latins, used in the same way, though Hilary makes it equivalent to hypostasis, when he speaks of three substantia in the Godhead. But there was still another term, the ambiguity of which produced continual controversies in the early church. This was the word subsistentia, which was at times used synonymously with ovcna, and at other times synonymously with hypostasis. Hence the Roman and African churches, in 347, at the synod of Sardes, pro¬ nounced the belief of three hypostases in the Godhead to be heresy. Athanasius expressly declares that hypostasis is exactly the same thing as ovaia (essentia). Yet it had been determined against the Sabellians at the synod held at Alexandria in 319, that there was one oucria H Y T 193 (essentia), and three hypostases in the Godhead. The Hypothesis confusion was in a great measure remedied by the discus- „ L sion at Alexandria, a.d. 362, at which Athanasius presided, y, y ^‘ y To his discretion the favourable result was mainly owing. It was now agreed that hypostasis should be taken in the stricter sense, so that, while there was one ovaia (essentia) in the Godhead, there were three hypostases, or persons. HYPOTHESIS, a temporary principle put forth in or¬ der to help in reducing our knowledge to system. A hypo¬ thesis, as such, is a temporary explanation of a phenomenon, and is subject to certain conditions;—1. The fact for the explanation of which the hypothesis is framed must be known to be a fact. 2. Before any one hypothesis be re¬ sorted to, it must be ascertained that no other hypothesis will answer equally well with the one chosen. The value of a hypothesis depends—1st, on its internal consistency, and external accordance with things known to be true; 2d, on the completeness with which it explains the phenomena in question; and ‘id, on the extent to which it is independent of other hypotheses. HYRCANIA, in Ancient Geography, a district of Asia, of which the limits appear to have been very different at dif¬ ferent times. In its most limited sense it corresponded very nearly to the modern province of Mazaunderan. In its more extended application it comprised, besides that province, those of Khorassan,Dahistan, and Dabistan, and was bounded on the N. by the Caspian or Hyrcanian Sea, W. by the Cha- rindas, which separated it from Media, S. by the Labuta range, which separated it from Parthia, and W. by the Charindas, which separated it from Media. The cham¬ paign country of Hyrcania was marshy, but in many places produced considerable quantities of corn and wine. Its mountain districts were densely wooded, and famous for their countless swarms of bees. The capital of the country was indifferently called Carta or Zadra-carta. Very little was known by the ancients about Hyrcania or its inhabi¬ tants. When its name occurs it is generally used as a synonym for anything more than ordinarily wild and in¬ hospitable. HYTHE, a municipal and parliamentary borough, and market-town of England, county of Kent, 15 miles S. of Canterbury. It stands at the foot of a steep hill or cliff, near the E. extremity of Romney Marsh, and consists chiefly of one long street, running parallel to the coast, from which it is about half a mile distant. The church, on the slope of the hill above the town, is an elegant cruciform struc¬ ture in the early English style. Hythe is much frequented during the bathing season. The municipal borough is go¬ verned by a mayor, four aldermen, and twelve councillors; and contained, in 1851,2857 inhabitants. The parliament¬ ary borough includes Folkestone and several smaller places, and contained, in 1851, 13,164 inhabitants. It returns one member to parliament. 2 B VOL. XII. 194 I. I T or i, the ninth letter and third vowel of the alphabet, || ^ is pronounced by throwing the breath suddenly against lambli- tile palate, as it comes out of the larynx, with a small hollow- chus. jng 0p t]ie tongue, and nearly the same opening of the lips as in pronouncing a or e. Its sound varies ; in some words it is long, as high, mind ; in others short, as bid, hid, sin ; in others, again, it is pronounced like y, as in collier, onion ; and in a few it sounds like ee, as in machine, magazine, and the like. No English word ends in i, e being either added to it, or else the i turned into y. But, besides the vowel, there is the jod consonant, which, because of its different pronunciation, has likewise a different form, thus, J, j. In English it has the soft sound of g ; nor is it used excepting when g soft is required before vowels, where g is usually hard. Thus we s&y jack, jet, join, instead of gack,get, gain, which would be contrary to the genius of the English language. I, used as a numeral, signifies one, and stands for as many units as it is times repeated; thus I. one, II. two, III. three; and when put before a higher numeral it sub¬ tracts itself, as IV. four, IX. nine, and so on. But when placed after it, as many are added to the higher numeral as there are Ts added. Thus, VI. is 5 + 1, or six; VII. 5 + 2, or seven; VIII. 5 + 3, or eight. The ancient Romans likewise used 13 for 500, CIO for 1000, 133 for 5000, CCI33 for 10,000. Further than this they did not go in their notation, but, when necessary, repeated the last number, as CCCI333>CCCI333> for 200,000; CCCI333>CCCI333>CCCI333> for 300,000; and so on. The ancients sometimes changed i into u ; as decumus for decimus, maxumus for maximus, and so on. According to Plato, the vowel i is proper to express delicate but humble things, as in the verse of Virgil:— “ Accipiunfc inimicum imbrem, rimisque fatiscunt.” I, used as an abbreviature, is often substituted for the word Iesus, of which it is the first letter. IAMBLICHUS, the Syrian Neo-Platonist, enjoyed considerable fame during his lifetime, which ended some¬ where in the first half of the fourth century; and he rose again into high repute at the restoration of Greek literature, Ficinus having edited and translated his most important work, De Mysteriis, as early as 1483. Gale, in 1678, published at Oxford an edition, which may be considered as our standard one, and should be known to every student of human thought. The prolix biography of Eunapius gives us very little valuable information as to lamblichus. He seems to have been, like the majority of the Neo- Platonists, an aristocrat, of an illustrious and powerful family of Chalchis, in Ccele-Syria. He assembled round him a school of disciples, whom we find with him sometimes at Alexandria, and sometimes at his favourite haunt, the baths of Gadara. We may regret the less, however, that so few facts have been preserved by them, when we look at those which remain. We can dispense with the testimony of men who assure us (and in one case, says Eunapius, as actual eye-witnesses) that he evoked the two genii of the fountains of Eros and Anteros, who came as two cupids to embrace him in their arms; that he worked miracles and prodigies; was surrounded at times by a golden glory ; and in one case was raised nine feet off the ground by an ec¬ stasy of prayer. Some of these latter tales he denied, but in a tone (if Eunapius is to be believed) which shows that he would not have been sorry had they been true. “ He who deceived you,” says he, “ was 4 6W adapts ’—not with¬ out elegance of imagination.” These few hints, combined with the works of his which remain, give us a key to his thoughts, of which something v c us‘ has already been said in the article on Hypatia. Under " Plotinus, and Porphyry (the tutor and afterwards the op¬ ponent of lamblichus), the object of the Neo-Platonist mystic had been the same as that of the middle-age mystic, viz., to raise himself to communion with, and ultimately to absorption into, Deity, by that strongest exercise of the rational will which results in its self-annihilation, and in a state of absolute passivity. Plotinus and Porphyry were said to have succeeded in this effort several times during their lives: but, on the whole, the majority of those who tried the experiment must have failed; and in proportion as it was found difficult for man to rise directly to God, the desire was reawakened of bringing the gods down to men, and so filling the dark void of secret unbelief. lam¬ blichus, as a native of Syria, the especial home of conjurors and gross superstitions, as well as of Gnostic mysticism, was a fit man to make this attempt; and from him dates a series of efforts to adapt to the mystic philosophy of the East as many of the old polytheistic forms of worship as were not absolutely impure. For this purpose it was necessary to explain the relation between the physical and the spiritual, not merely (as with Plotinus) in the case of Deity and of man, but in the case of Deity and all nature. Hence lam¬ blichus was especially attracted by the symbolic nature- worship of the Egyptians and Chaldeans, which he (or some disciple of his) defends against the cavils of Porphyry in the famous letter of Abamnon the priest. Hence, too, he was attracted by the Pythagorean dreams as to the sacredness of numbers. We find among his works (or rather his com¬ pilations from early Pythagoreans) explanations of the sym¬ bols of that school; and the title of one lost work {The Theo¬ logical Principles of Arithmetic) sufficiently explains both itself and the cast of its writer’s mind. Connected with this habit of mind is, it would seem, his denial of Plotinus’s dogma, that reason in the human soul is without passivity. He requires a theory which will enable him to explain how the spiritual (whether human or divine) can be affected by incantations, ceremonies, suffumigations, sacrifices; and, above all, how the Deity adjured shall not only appear to, but inspire and possess the soul of the ini¬ tiated or priestly man, independently of any human will; and he has therefore to assume (perhaps not wrongly), a capability in the soul of being influenced passively and in¬ voluntarily ab extra. If this be the true explanation, the question between Plotinus and lamblichus is none other but the insoluble one between the advocates of grace de congruo and those of grace preevenient. But lamblichus fell into that degraded form of the latter belief which tempts to an altogether magical view of the efficacy of symbols and of ceremonies, and which tempts likewise to a modified poly¬ theism, in his case taking the form of a host of demons, heroes, and gods, besides angels, principalities, and souls; each rank of which depended mysteriously on the one above it (some remnant, probably, of the old notion of successive emanations, borrowed from the earlier Syrian Gnosis). These beings confer on man gifts corresponding with their own natures; and they appear in forms, and with accom¬ paniments, symbolic of their rank and power. In sketching these various apparitions, lamblichus shows a clumsy turn for symbolic fancy, contrasting strongly with the great acuteness with which he specially pleads in behalf of these follies. His greatest difficulty is, of course, Porphyry s objection, that the incantations, and even threats and insults, used by the priests to make the gods appear, were at once I A M I B E 195 Iambus, immoral and unphilosophical. The gods could not be the jr -mJ passive puppets of men, of herbs, of incense, of talismans. lamblichus answers, with much ingenuity, that the threat¬ ening words are only anthropomorphic adaptations, as are all assertions that the gods are angry or alienated ; and that the ceremonies used do not act by altering the will of the Deity, but by virtue of secret affinities which run through all natural and spiritual beings, linking each heavenly being to some earthly one,—as Phoibos to the laurel, and Asclepios to the cock; so that “ immaterial things are immaterially present in material things.” Nay, there is even a “ pure and divine matter” in sacred objects underlying the gross appearance, and akin to the Deity, to which it is consecrate; which, if it be employed in the making of statues or of temples, or in holy x'ites, attracts and calls out the gods, by mystic sympathy, to show themselves to the worshipper. It may be easily seen from these few hints what a door to superstition of the lowest kind lamblichus was re-open¬ ing, by thus justifying to the educated classes that mate¬ rialist idolatry which still lingered among the lower. From his time forth, Neo-Platonism followed, if not smoothly, still surely, the downhill path which he had pointed out; and which, perhaps, was the only one possible for it, and for the old mythologies which it tried to rehabilitate. But his book (if it be his) is most worthy of careful study, alike to the theologian and the philosopher, who will find it full of significance for us and to every age. lamblichus may be considered to have said all which can be said on be¬ half of the magical theory of ceremonial and sacramentary worship; and the metaphysic by which he justified the old polytheism was virtually that which the more mystic section of the Eastern Church justified in after ages their own idolatry. The Latin mediaeval church, forming itself among nations of a more practical and objective habit of mind, adopted the results of such a form of thought, dogma¬ tically, in a coarse and literal shape, without asking for a philosophic justification of them ; and the mystic develop¬ ments of mediaeval Germany were rather of the Platonist than of the lamblichan school,—protests against surround¬ ing idolatry, and not excuses for it. But there are now signs of a desire to connect the Roman popular belief with the spiritualist philosophy of Germany; which, though tokens of old age and decay, may yet give a new galvanic life, for centuries to come, to the mediaeval Pantheon. In such a case lamblichus may regain the honour in which he was held by the Neo-Platonists of the sixteenth century, and even be once more (as he was by his contemporaries) pre¬ ferred to Plato himself. In any case, all which can be said in favour of such a movement lies virtually and half de¬ veloped in the Letter of Abamnon; the spiritual want is the same as that of his day; the method of patching the rent, and of putting new wine into old bottles, will pro¬ bably be the same also. “ The thing which has been, it is that which shall be; and there is no new thing under the sun.” (c. k..) IAMBUS, one of the commonest feet in Greek and Latin prosody. It consists of two syllables, of which the first is short, and the second long, as Horace says,— “ Syllaba longa brevi subjecta vocatur iambus Pes citus.” The iambic metre was originally employed in satirical . poetry called iambi, of which the laws were first fixed by Archilochus. Before his time, the trochaic tetrameter had been the popular measure in poetry of this class ; but when the rapidity of dialogue and theatrical action came to be duly studied, nature herself pointed out the iambic as the most suitable metre; for, as Aristotle remarks, it is the most colloquial of metres, as may be seen by one who chooses to remark that ordinary conversation often falls into iambic verse, and never into any of the more formal metres’ —the hexameter, for instance. The most common form of iambic verse is that known as the lambic Trimeter Acatalectic, or Tragic Senarius, as it is called, from being the favourite metre of the Greek tra¬ gedians. It consists of three measures of two feet each, and has no catalectic syllable. The feet admissible in the various places are given in the subjoined table:— lapodes II Iberus. 2. v— VJ — v— v/— v — \J \J \J U U V UVV UUU U V V — u u u u — In the case of proper names, an anapaest may be admitted into any place except the sixth, which must always be an iambus. But for the anapaest to be thus admitted, it is necessary that it be completed within one word, and leave no syllable or syllables over to be carried on to the next place. In the comic trimeter a dactyl may be used in the fifth place, and an anapaest in any of the first five. Great care was bestowed by the Greek tragedians on the caesural pauses, on the proper distribution of which depends much of the beauty of the iambic metre. The two principal caesuras are the penthemimeral and the hephthemimeral; the first falling (as its name denotes) on the fifth half-foot, and the other on the seventh half-foot. The penthemimeral is by far the most common of these two. Penth. v rixva Kcc^]fj,ov rou This supreme magistrate has the title of Stiftamtman, and is intrusted with a general superintendence of every depart¬ ment. Under him are the amtmen or provincial governors, each of whom rules one of the four provinces of the island, and possesses a similar jurisdiction over his respective (Fial‘ ter, as his superior officer does over the whole island. Each province again is divided into syssels or shires, over which the sysselmen preside. This office is likewise in the ap¬ pointment of the crown ; and, on account of its importance, ICELAND. 199 Iceland, it is always given to one of the most respectable landed ^ ; proprietors within the district. The rank of sysselman cor¬ responds in some degree to that of sheriff in this country. The hreopstiore is a subordinate parochial officer, whose duty it is to attend to the condition of the poor, and to assist the sysselman in the preservation of the peace. He is usually chosen from among the farmers; whilst the forlik- unarmen are those appointed as arbiters for the decision of disputes among the parishioners. The laws of Iceland, like the general form of government as established nearly six hundred years ago, have undergone little important altera¬ tion ; but the judicial changes have been more considerable, and the forms of justice in most respects now resemble those of Denmark. The residence of the governor is at Reikia- vik, in the S.W. angle of the island, the only place ap¬ proaching the character of a town in Iceland. There like¬ wise the althing or parliament meets once in two years to make laws for the island, under correction of the Danish crown. The revenue of the island, arising from crown property, commercial charges, a small tax on transference of property, &c., amounted in the year ending 31st March 1854, to 27,949 rix-dollars (L.3119), while the expenditure for offi¬ cers’ salaries, education, the clergy, and other items, was 56,743 rix-dollars, or more than double the income, the excess being supplied by the central government. The income, however, appears to be increasing in proportion. Crimes are rare ; the gentle and peaceable disposition of the natives, their moral and religious education and sober habits, act as preventives of such as are of a flagrant de¬ scription. Small thefts, especially of sheep, are the most frequent; but the high court has seldom to decide more than six or eight cases annually. The whip is the only punishment applied in the country, excepting fines ; those who are punished with hard labour or banishment being sent to Copenhagen. There are about 194 parishes or livings on the island; but the clergy number at least 300, as many of the parishes have two churches, the great distance and the danger of travelling, particularly in winter, when the rugged fields of lava are covered with snow, making it frequently impos¬ sible for all the peasantry of the same parish to attend at one church. The clergy are partly supported by a species of tithes, which are mostly paid in kind. These stipends, however, are extremely miserable ; the largest in the island not exceeding 185 dollars, and the average being little above 35 dollars, or L.6 sterling per annum. They must therefore depend almost entirely for subsistence on their glebe land and their stock of cattle, and a small pittance they are entitled to for the few baptisms, marriages, and funerals that occur among their parishioners. “ The clergy,” observes Mr Barrow, “ almost universally submit to every species of drudgery from necessity. Their incomes are too small to allow them to hire and feed labourers ; and nothing is more common than to find the parish priest in a coarse woollen jacket and trousers, or skin boots, digging peat, mowing grass, and assisting in all the operations of hay¬ making. They are all blacksmiths also from necessity, and the best shoers of horses on the island. The feet of an Iceland horse would be cut to pieces over the sharp rock and lava if not well shod. The great resort of the pea¬ santry is the church; and should any of the numerous horses have lost a shoe, or be likely to do so, the priest puts on his apron, lights his little charcoal fire in his smithy (one of which is always attached to every parsonage), and sets the animal on his legs again.” The bishop has a neat mansion in the neighbourhood of Reikiavik, and his cathe¬ dral within the town is a handsome structure, furnished with a good organ, and possessing a beautiful marble bap¬ tismal font, the work of Thorvaldsen, who sent it as a pre¬ sent, in consideration of his being of Icelandic descent. The clergyman of the parish having to undergo the same toils and hardships as the most humble ot his flock, and enjoying no superior comforts or refinements, must feel that it is by his intellectual attainments only he can retain that station, and command that respect from his parishioners, which it is so necessary for him to possess. Literary pursuits are therefore the principal occupation of the clergy during the long and dreary period of winter; and, considering the difficulties in their way, the progress most of them have made is astonishing. The history and literature of the more refined nations of Europe now form a part of their studies. The English language, in which they find so many words of their own, and so many bor¬ rowed from the Latin, is cultivated by many of the clergy. The German they find still more easy; the Danish or Nor¬ wegian language is only the modern form of their own ; and many of the choicest works in these dialects have been translated into Icelandic. The present state of literature in Iceland thus appears to be of a different description from what it was in ancient times. Its supposed decline is the subject of general complaint, though in point of fact it has only changed its character from the heroic and romantic to the useful and intelligible. A traveller found in 1855 two monthly newspapers published at Reikiavik. In the printing office there the master was putting through the press a translation of the Odyssey into Icelandic, and he showed a considerable stock of smaller works. A public library of two or three thousand volumes, accessible at a moderate rate, serves to introduce the inhabitants to the best productions of continental and English talent. There are no public hospitals or charitable institutions of that description on the island; the sick and the poor being almost wholly supported by their own families. In¬ deed a sort of disgrace attaches to those who send them away to be taken care of by strangers, even though main¬ tained at their own expense. Owing to the dispersedness of the population, there are no juvenile schools in Iceland: the system of juvenile education may be described as tra¬ ditional ; that is, each father teaches his own children. Not¬ withstanding the imperfection of this system, there are few who cannot both read and write well. It is remarkable that even in Reikiavik, which has a population approaching 1000, there is not a single school for children. It possesses, how¬ ever, a kind of gymnasium or inferior college, well endowed by the government, where the youth designed for professions are educated. This establishment occupies a large and goodly building, containing a suite of school-rooms, and accommodation for a portion of the scholars, who are usually in all about sixty. There are three masters, the one, pro¬ fessor of theology, instructs the pupils in Hebrew and Greek, as far as the Greek Testament and Xenophon ; the second teaches Latin, history, mathematics, and arithmetic; and the third the Danish, Norwegian, German, and Icelandic languages. There is also a teacher of the English lan¬ guage. The attendance of the pupils is constant from Oc¬ tober to May, the intermediate months being the period of vacation, when they go to their homes. Property is held either of the crown or in fee simple ; the crown lands and many others are let to farmers, on what may almost be called perpetual leases. The rent is paid in two parts ; the land rent, fixed at an old valuation, which it has not been found necessary to alter, and a rent for the number of cattle which it is calculated the farm is able to support; and these are transferred from one tenant to ano¬ ther, each succeeding one taking them, and leaving a simi¬ lar number on quitting the farm. This, however, does not prevent a farmer keeping as much stock as he can main¬ tain, without paying an additional rent. The tenant is for life, provided he does not injure the farm ; but he may quit whenever he pleases, on giving six months’ notice. His rent is generally paid in produce ; on the coast in fish ; in the Iceland. 200 I C E L Iceland, interior in wool, tallow, butter, sheep, &c., or, according to 'wv—' agreement, in money. Individuals who cultivate their own properties, and tenants who are in easy circumstances, gene¬ rally employ one or more labourers, w'ho, besides board and lodging, have from ten to twelve dollars of annual wages. In Iceland, as in Norway, there is no such thing as entailed property, and the law of descent excludes primogeniture. If an individual die intestate, his estate is sold or valued, and divided amongst the children, so as to give equal shares to the sons, and half shares to the daughters. If, however, any of the brothers can pay the shares to his brothers and sisters, it is generally arranged that the freehold estate be made over to him, in order to retain it in the family. Population. The popidation of Iceland has undergone considerable vicissitudes through the operation of epidemics. At 50,444 in 1703, it had sunk in 1769 to 46,201, nor did it rise much above this point throughout the remainder of the century. In 1850, it was 59,157. This is small for an island whose surface is to that of Ireland as four to five ; but that sur¬ face both from its own nature, and the character of the climate, is perhaps as unfavourable as any which exists be¬ tween the limits of the two arctic circles. Deducting the areas of the numerous fiords with which it is intersected, the square contents of the land may be calculated at 37,388 sta¬ tute miles ; but as the centre of the island consists entirely of snowy and uninhabited mountains, the peopled portion cannot be considered more than 25,000 square miles ; and the population therefore wdll not much exceed two persons on each square mile. At present the population must be increasing with greater rapidity, if we may judge from the proportion of births to deaths, the respective numbers in 1852 being 2435 (of which 333 illegitimate) and 1437. The whole population is employed either in farming, which oc¬ cupies about three fourths* of them, or in fishing. Other employments do not exist, nor is there any other class of people or townsmen, save the small number of merchants in Reikiavik and the other trading establishments. Every branch of industry is therefore domestic, and confined chiefly to articles of clothing, such as coarse cloth, gloves, mittens, and stockings. The peasantry are generally ingenious, and manufacture such simple pieces of furniture as their cot¬ tages require ; some also aspire to make trinkets of silver, and articles from the walrus tusks. The trade of Iceland has never, till the present time, been managed in what mo¬ dern science points out as the most advantageous way. The Danish government long had a monopoly of the busi¬ ness of this remote dependency. For many years, while this was abolished, Danish merchants had a preference in trad¬ ing, by virtue of higher dues exacted from those of other countries. It was not till 1856 that the foreign merchant was encouraged to come to Iceland by a perfect equality of terms. The only place in the island entitled to be considered as a port is Reikiavik: only a few trading sta¬ tions exist elsewhere. There is an annual export of from 1,000,000 to 1,200,000 pounds of raw wool, besides about 200,000 pairs of knitted stockings, and 300,000 mittens, or gloves without fingers. The Iceland sheep have remark¬ ably fine fleeces of wool, which the farmers in the spring of the year take off whole; their weight being usually from four to five pounds. The other principal branch of indus¬ try in Iceland is fishing, which must be considered as in a thriving state. The fishing banks around the island abound in cod and other species, and the number of boats engaged in the business in 1853 amounted to 3506, being an advance of nearly 50 per cent, in 20 years. Fish-oil, whale-blubber, skins, eider-down, feathers, and the Lichen Islandicus for medicinal purposes, may also be included amongst their list of exports. These the natives dispose of to the Danish merchants in exchange for coffee, sugar, tobacco, snuff, a small quantity of brandy, rye and rye-bread, biscuit, wheaten flour, salt, soap, and such other small articles as are in con- AND. stant use for domestic purposes. Those who can afford it Iceland, purchase a supply of linens and cottons, which of late years have become of more common use, and which must tend greatly to cleanliness, and the prevention of those diseases which woollen clothing worn next the skin tends to engen¬ der. The traffic thus occasioned takes place in the early part of summer, and whilst it lasts creates a kind of fair, with no little bustle and business, in the capital. All the articles brought from the interior for sale at the sea-ports, and all those taken back for winter consumption, are trans¬ ported on pack-horses. There is not, in fact, in all Iceland such a machine as a wheel-carriage; before any such can be used, there must be roads, of which up to the present time none exist. The lines of transit along the country are mere tracks, cut deep by use where the ground is soft, and encumbered by blocks where it is hard. Yet, full as these paths are of difficulties, it is surprising at what a pace the small hardy sure-footed horses of the country will proceed. For foot-travelling they are in general impracticable. The Icelanders are generally middle-sized and well made, though not very strong. Their manners are exceedingly simple, and they are very respectful as well as obliging to strangers. Though their poverty disables them from imi¬ tating the hospitality of their ancestors in all respects, yet they cheerfully give away the little they have to spare, and express the utmost satisfaction if the gift shall have proved acceptable. They possess but few peculiar customs, and those not of particular interest. Their sole occupation during summer is to provide means of subsistence for the winter season; and when confined during the dreariness of an arctic winter to their huts, their great source of amusement is the tales of olden times, when the learning of their coun¬ try rendered it renowned in every quarter of Europe. “ Being of quiet and harmless dispositions,” says Sir George Mackenzie, “ having nothing to rouse them into a state of activity, nothing to inspire emulation, no object of ambition, the Icelanders may be said merely to live. But they pos¬ sess innate good qualities, which, independently of the con¬ sciousness of their former importance, have preserved their general character as an amiable community. They have indeed become negligent with respect to the cleanliness of their persons and dwellings, but they deserve a high place in the scale of morality and religion. To religious duties they are strictly attentive; and though the clergy are not generally raised above the level of the peasantry in any re¬ spect but in their sacred office, yet they have been able to preserve the regard due to those wdio are considered as pe¬ culiarly the servants of the Supreme Being.” The poor Icelander, too, is strongly attached to his native soil, and, like the Swiss, has been known to throw up lucrative ap¬ pointments which he held elsewhere, for the sake of rejoin¬ ing his family and friends on the island, being nevei so happy as when he sees a prospect of returning to it. Few countries in the world present a more forbidding Topogra- aspect, or have less apparently to invite the approach either phy. of the traveller or the merchant, than Iceland. The inte¬ rior is composed, as already mentioned, of lofty mountains, many of them volcanoes, nearly the whole being a pathless wilderness of snow. The circle of lower ground round the coast, where alone there is any population, is generally bare, rocky, and desolate, with only an admixture of green spaces where man and the domestic animals may find a subsis¬ tence. Nowhere does a tree rise to vary or soften the ri¬ gorous landscape. A bae ox farm-stead is usually a cluster of low semi-subterranean hovels, covered thick witn sod, and with few apertures to admit the light; there, as much as possible, the whole family, parents, children, and servants, eat and sleep in one room for the sake of warmth. At the fishing villages on the coast there is often a merchant s house of somewhat more roomy and elegant accommoda¬ tions. The town of Reikiavik is mainly a mercantile esta- I C E I Iceland, blishment; and, accordingly, its few short regular streets contain a considerable number of roomy wooden buildings, resembling those of Norway, and furnished with many of the comforts of life ; there the merchant usually has a large miscellaneous shop and stores for goods on the ground floor, and a tolerable suite of apartments for his family above. Standing a little apart, and in strong contrast, is the fishermen’s village, consisting of a cluster of the veriest hovels; there, according to the description of a traveller, —“ A window is a luxury ; a cask or barrel, with the two ends knocked out, answers the purpose of a chimney ; but the smoke is frequently allowed to escape through a hole in the roof.” The surface of the country is for the most part highly mountainous and rugged ; some of the yokuls or snow¬ capped eminences, as the Snaefell, the Skaptaa, Kateja Torsa, and Hecla, rising to the height of from 4000 to 6000 feet above the sea. The centre of the island, how¬ ever, is traversed by considerable plains, some of which are covered with tolerable pasture, whilst others form extensive wastes, morasses, and fields of lava. It is also watered by a number of large rivers, which, from the rapid melting of the snows in summer, present a turbid, and some of them so white an appearance, that they are denominated from that circumstance. The smaller streams which rise in the lower grounds are transparent, and are celebrated for the abun¬ dance and beauty of the salmon which frequent them. There are also a number of lakes, of which the principal are Thingvalla Vatn, an expanse of water from 10 to 15 miles in length, and 6 to 8 in width, on whose banks the great assemblies of the nation used to be held ; Myvatn, in the north-eastern extremity of the island; and Fiskevatn, a lake so designated from the fine fish it affords to the inha¬ bitants of the midland districts. T-he coast, like that of Norway, is in every direction deeply indented with creeks and arms of the sea; few of them, however, afford safe anchorage ; and along the south¬ ern coast, eastward from where the great river Elvas emp¬ ties itself into the sea, there are extensive shoals, formed partly, no doubt, by the depositions of the rivers proceeding from the great range of yokuls to the eastward of Mount Hecla, but principally from the remains of volcanoes, which, like the Sabrina and Graham Islands, have at one period appeared above the surface, but from the action of the waves have subsequently sunk below it. No part of the globe presents such a number of volcanic mountains, so many boiling springs, or such immense tracts of lava. The frequent and long-continued eruptions of its volcanoes are all on record in the historical annals of the island; their number since the year 1004 is stated at sixty-five. Of Hecla no less than sixteen great eruptions are mentioned ; but, with the exception of those in 1818 and 1846, this celebrated mountain has been in a quiescent state since the middle of last century. By far the most dreadful occur¬ rence of this description was that already mentioned, which took place from the great range of the Skaptaafell Yokul in the year 1783,—an eruption which devastated the finest portion of the island, and produced famine and disease amongst its inhabitants to an extent scarcely credible. The boiling springs of Iceland have long attracted the attention of scientific men, and they are assuredly amongst the most curious and most remarkable phenomena which it presents. These are very numerous in many quarters of the island. One group, called the Geysers of Haukadalr, situated at the distance of two days’ ride (about 70 miles) from Reikiavik, has attracted special attention. It occupies a space of a quarter or third of a mile square, on the slope of a small hill of trap rock, overlooking a valley connected with that of the River Hvita, or White River. In thq lower part, amidst grassy ground, are the various hot-water wells and openings now in activity, each surrounded by VOL. XII. AND. 201 more or less of silicious incrustations; in the upper and Iceland, steeper part, immediately under the cliffs forming the top of the hill, are great banks composed of the debris of the incrustations of ancient and now nearly extinct geysers. The district of the active springs is constantly covered with steam proceeding from the various openings, and a sulphu¬ reous smell pervades it. The springs are very various in size and action ; many being small, and a few large; some being constantly full to the brim and at rest, while others are at full boil; and a few are subject to occasional water- eruptions. The most remarkable are the Great Geyser, the Great and Little Strokr; and two large but quiet wells, noted for the beautiful blue tint of the water. The Great Geyser presents itself, in its calm moments, as a circular pool, 72 feet in diameter, and 4 feet deep; placed on the summit of a mount wholly composed of sili¬ cious matter, and from 10 to 20 feet high, according to the side on which it is measured, the ground here making a rapid inclination. In the centre of the saucer-like basin containing the pool is a well, above 10 feet in diameter and 83 feet deep. Water at a high temperature is continually rising through this well, and filling and overflowing the basin, at the outer edge of which the writer found it to be at 188° Fahrenheit. Every few hours, however, a rumbling noise is heard underground, and the water heaves up in the centre a few feet above the general level, and overflows the basin in unusual quantity. Once a-day, at an average, an erup¬ tion takes place,—a spectacle of the utmost grandeur. “ The prominent object before me,” says a late tourist, “ the ground of the spectacle, as an artist might call it, was the vast effu¬ sion of steam covering the place, and rolling away under a varying wind. It was only on coming pretty near and getting to windward, that I caught the sight of a multitude of jets of water darting in outward curves, as from a centre, through amidst this steam-cloud, glittering in the sunshine for a moment, and then falling in heavy plash all over the incrusted mount. It seemed to me, though the circum¬ stances are certainly not favourable for an accurate esti¬ mate. that these jets rose about 60 or 70 feet above the basin.” An eruption generally lasts a few minutes, and at its close the water is found to have shrunk a few feet down the well, leaving the basin dry. Sir George Mackenzie spe¬ culated on these outbursts being produced by pressure on the air contained in cavernous recesses under the ground; but Professor Bunsen has lately announced a chemical theory much more likely to be accepted. He points to the fact that water, after being long subjected to heat, loses much of the air contained in it, has the cohesion of its molecules much increased, and requires a higher temperature to bring it to the boil, at which moment, however, the production of vapour becomes so great and so instantaneous as to cause explosion. The bursting of furnace boilers is often attri¬ butable to this cause. Now, the water at the bottom of the well of the Great Geyser is found to be of a constantly in¬ creasing temperature up to the moment of an eruption, when on one occasion it was as high as 261° Fahrenheit. Pro¬ fessor Bunsen’s idea is, that, on reaching some unknown point above that temperature, ebullition takes place, vapour is suddenly generated in enormous quantity, and an eruption of the superior column of water is the consequence. The Great Strokr (strokr means a churn in Icelandic), situated about 100 yards from the Great Geyser, is a pit of silicious matter, of irregular form, but approaching the appearance of a well, and having only a tendency to the formation of a basin at the top. Usually, the water is heard fretting about a dozen feet down; but at intervals of half a day or so, eruptions take place, resembling those of the Great Geyser, I he visitor can here command an eruption, by throwing in a barrowful of turf, or any similar stuff. I he appearance and phenomena of the Little Strokr are precisely similar, only on a smaller scale. It appears that 2 c 202 ICELAND. Iceland. the blue holes above —Ge^ and were styled by a g becoming tranquillized that tlm presenVGreat Stro^r began Its outrageous Ptae- and notw.thstandmg the^ the infusion of foreign cooking, or ev , ^ b j g ]jtt]e more than a thousandth matter is extremely small g ^ statement K^ck regkrdlnTa quantity of JO.OOO grains (about one-sixth of a gallon): Iceland. a a. 0 95 Alumina 0^8 Silica S'40 Muriate of soda 2,46 Dry sulphate of soda... 1'46 Total 10-75 Small as is this proportion of silica, it has been enough • timp to form the thick incrustations around the geysers, Ind evei the mount on which the Great Geyser is situated These "ncrustatlons are usually of a dull colour and great i i e- their surfaces being efflorescent, like the top of SX’web wheTevS the water falls in a plash, in other places smooth. oniy to glance at the geysers con- Uur space emu j * These have cauSed, m the'superior"part of the slope, several deposits of various colTh: —^ °v!:e hot spritTol Iceland, out of the materials presented by rnPrks°of the country, offers the most curious subjects the rocks o / of these products there is one ffsZercommercid importance, and which calls for special of some comme . 1 Tf. nroduced in large quantities attention v^ulphur. - Foduced^ Kra. S"lfa h£%l’d«l°efb"'a deposiuofredand^ ^ a" a? to tta o d”arytomng water. The hot springs ?ushin ° through these deposits form the sulphur in crystals S in layers, requiring very little refin,ng to prepare ,t for USThe mud volcano of Reykialid, near Myvatn, occupies the crater of Mount Krabla, one of the principal volcanoe mtcXd,and is thus described by Henderson whomade b’tmmof a° dfep 'g«»v llyra cirVularp'ool of Mack liquid SeSrSg'onlhe Lt propulsions of the liquid to about twelve feet, 2nd continuing to ascend, “w^’ yard7of till they gain the highest elevation, which is upwaras oi thirty feet when they again abate much more rapidly thai SeTrise!’ a" d after the spouting ceases, the situation of the aperture is rendered visible only by a gentle ebulhUon, which distinguishes it from the general surface of the pool, the eruptions take place every five minutes, and last about two minutes and a half.” In the same vicinity are the hot springs of Husavik, which, though they bear no comparison m magnificence to those of Skalholt, are extremely interesting in many respects. The pipe of one of them, the Oxahver, which is said to have derived its name from the cncu - stance of an ox having fallen into it, is about eight feet in diameter, is surrounded with a strongly mcrusted brim, anu shortly below the surface trends to one side, and becomes quite irregular. Its jets rarely exceed twenty feet in height, but according to Henderson’s account, they are conducted with the utmost regularity in point of time. It was amongs the beautiful incrustations formed around the basin of this spring that Mr Rose of Edinburgh, during his mineralogical excursion a few years ago, observed that variety of apo- phyllite, to which the synonyme of Oxahvente was subse- qU Thoughlrcannot be denied that these springs have some communication with the volcanoes which abound m he island, yet it is a remarkable fact that they are seldom found very near them, although dispersed throughout the who e country. When their situation suits, they are turned to good account by the inhabitants, both as bathing quarters, and for various culinary purposes, m boillIJg ^b’ e ai ° in2 sea-water, and the like. At Reikholt there is a cele¬ brated bath of this description, which was constructe six hundred years ago by the famous Snorro Sturleson. It is fourteen feet in diameter and six feet deep, being supplied, by means of covered conduits, both with hot and cold water, from springs about a hundred yards distant, so that any de¬ sired temperature might be obtained. Iceland is one mass of igneous rocks, of two classes fi =t, traps and tuffs arranged in beds generally bttle ^hned and presenting in some places sectional cliffs of fiom thiee to four thousand feet in height; second, trachytes in huge irregular masses, constituting the principal mountains of the interior. Different as they are in general appearance, a con- “lotion can be established between them by the dearest intermediate steps, exhibiting a progress in time from t formation of the traps under a superincumbent ocean, to the tremendous subaerial volcanic operations which produce the trachytes, and which cannot yet be said to be at an e . The traps are intersected by numerous veins and cuiious appearances are presented where these have alone survived t he disintegrating forces. The surfaces of some of the lavas which Sir George Mackenzie observed in ^eland he e- scribes as not unlike coils of ropes or crumpled cloth , m other respects they appear to resemble the kvas of recent volcanoes elsewhere, being, like those of ARna, thrown up Into large flattened masses. These, it is well known, are nroduced by the formation of a crust on the lava during its course, which, as it accumulates, breaks through the hard¬ ened surface ; and thus, when it cools, leaves a wide ex¬ tended plain of the most rugged and impassable description. In some places the surface has swelled during the couise the lava into knobs, from a few feet in diameter to foi y o fifty, many of which have burst, and disclose caverns lined with melted matter in the form of stalactites. Of these some remarkable instances are mentioned amongst the extre ly ruo-cred lava of Buderstad, in the vicinity ot the bnaeteii Yokul where several of the caverns extend to the depth o forty yards. Stappen, in the same part of the island, pre¬ sents Vor the extent of about two miles, the most striking columnar appearances, both in the cliffs which form the shore and n the numerous insulated rocks which appear Sent distances from the land. Amygdaloid forms he larger portion of the eastern extremity ot the island, and it is imbedded in this that those splendid specimens of calca¬ reous spar par excellence denominated Iceland-spar are found This rock is likewise the matrix ot all the differen varieties of the zeolite tribe, of the magnificent ca cedomes and in fact of most of the fine minerals which have long rendered Iceland so celebrated among collectors. FoS)Sll^ed woodTs found in several places; that variety termed Sur turbrand is peculiar to the north-eastern volcanic district. It is remarkable that the specimens hitherto brought bo™e of Sis last substance appear to be oak ^b-ns -th tae, and can be cut and shaped like jet; but from does not admit of being"sliced into shavings sidian and other volcanic minerals appear in great y in manydistricts of the island, particularly near Hecla, and t0 Therels Me remarkable in the zoology of Iceland. ICE I C H 203 Iceland. The only wild animals are foxes, which in some parts of it > are very numerous, and do much damage to the farmers in destroying their lambs and other produce. Reindeer were introduced from Sweden about the middle of last century, and have since increased and run wild. The Iceland horse is small, but hardy, active, and capable of sustaining con¬ siderable fatigue. Dogs and cats they have in abundance, and rats and mice are proportionally numerous. The float¬ ing ice occasionally transports a polar bear or two from the Greenland coasts during spring, which, however, are no sooner heard of than the neighbouring country are up in arms to kill them, and they are consequently hunted down and destroyed without mercy. The skins of the foxes, par¬ ticularly those of the blue species, are valued as an article of commerce. Amongst the land birds of the island are the sea-eagle or erne, a very destructive bird among the eider-ducks; the falcon, which used formerly to be a valuable item in the ex¬ ports of the island ; and the raven, which is a larger and more powerful bird than those of Britain, frequently pouncing upon and carrying off young lambs, and destroying poultry ; it is met with in great numbers, particularly on the cliffs near the sea-coast. The ptarmigan, snipe, golden plover, wagtail, and curlew, are well known. Water-fowl of every descrip¬ tion, common to northern latitudes, are met with on the coasts and in the lakes. Of these the most valuable to the inhabitants is the eider-duck, which is strictly preserved, a penalty of half a dollar being exigible for shooting one of these birds. From this circumstance they become so re¬ markably tame, especially in the breeding season, that they frequently make their nests close to the houses, and in spots which have been prepared by ridges of stones artificially built up for them; and in such places, during the process of in¬ cubation, it is not unusual for the female to remain on the nest, and suffer herself to be fondled. The lining of their nests, being the downy substance plucked off their own breasts, is taken away, even a second and third time, until the poor bird has plucked herself nearly naked. Their eggs, too, are removed once or twice, and are eaten in the same manner as plovers’ eggs. Swans are very numerous in some of the lakes of the central part of the island, where they re¬ main unmolested until the ice sets in, when they betake themselves to the sea-shore. The eggs, the feathers, and the down of this fine bird, like those of the eider-duck, sup¬ ply the peasantry with an article of food, and also of com¬ merce. The vegetable productions of the island, as already stated, are the reverse of luxuriant. With the exception of a few stunted birch, and some dwarf willows, in the southern and eastern districts, nothing in the shape of a tree occurs ; and, even in the sheltered situations afforded by the gardens surrounding the merchants’ houses near Reikiavik, all at¬ tempts to raise the most common culinary vegetables occa¬ sionally fail. Even in good years, Dr Hooker remarks that in many of these little inclosures the cabbages were so lan¬ guid and small that a half-crown piece would have covered the whole of the plant. It is a curious fact, however, that timber has in former periods grown in more abundance, as is evident from the logs so frequently met with in the mo¬ rasses and peat-bogs of the country. These the peasants are in the habit of extracting and using for firewood. The scanty produce of the land is, however, to a great degree compensated for by the abundance of fine fish which occurs on the coast. In several parts of the island, par¬ ticularly on the north and north-west, the shark fishery is a regular occupation. Strong hooks fastened to chains are baited and anchored a little way out to sea, and the fish when caught are thus towed to shore. Of the skin shoes are made, a considerable quantity of oil is extracted, and some parts of the flesh are occasionally smoked and used by the natives for food. The cod is very plentiful; the haddock grows to a large size; ling, skate, flounders, and halibut aie likewise very common; the herring, too, fre¬ quents the fords in vast shoals, but this branch of the fishery has hitherto been little attended to. The salmon in the rivers are said to be very fine, and no country in the world produces them in greater quantity. Seals are particularly numerous on the shores of the Breide-fiord and the western coast. Such is a rapid sketch of the most remarkable features of Iceland. The ardour, however, with which the sciences of natural history and geology are now pursued in Britain, coupled with the increasing facility every year afforded by means of steam navigation, will, no doubt, in the course of a very few summers, present us with more minute and more accurate information respecting the truly extraordi¬ nary natural productions of this wild but wonderful island. (See Letters on Iceland, by Von Troil, in 1772 ; Travels in Iceland, by Sir George Mackenzie, in 1810; Journal of a Residence in Iceland during the Years 1814 and 1815, by Ebenezer Henderson ; Visit to Iceland in the Summer of 1834, by John Barrow, Esq., jun.; and Tracings of Ice¬ land and the Faroe Islands, by R. Chambers, 1856. (t. a—l—n.) (r. ch—s.) Iceland Moss. See Botany, Nat. Order 273. ICENI, in Ancient Geography, a warlike tribe of Britain, inhabiting a part of the island nearly corresponding with the counties of Norfolk and Suffolk. The exact limits of their country are very difficult to settle, and as the point is one of some importance for rightly understanding the cam¬ paign of Ostorius, it has caused a good deal of controversy. The only way of escaping the difficulty is to believe that the Iceni occupied a considerably larger surface of country than is usually assigned to them, and extending their fron¬ tiers to the confines of Essex and Hertfordshire. The great event in the history of this tribe is their rebellion from the Roman yoke under their queen Boadicea. See Boadicea. ICHNEUMON. See Entomology and Mammalia. Iceland Moss Ichneu¬ mon. 204 ICHTHYOLOGY.1 2 INTRODUCTORY CHAPTER. SECTION I. DEFINITION AND GENERAL OBSERVATIONS. THE PRINCIPAL EPOCHS IN THE SCIENCE OF ICHTHYOLOGY. VERTEBRALS. Fishes may be technically defined as vertebrated animals with red blood, breathing through the medium of water by means of branchice or gills. dhis definition, as Baron Cuvier has remarked, is the result of observation; it is a product of analysis, or what is termed in physics an em¬ pirical formula; but its accuracy is demonstrable by the inverse method, for, when once duly perceived, we may, in a great measure, deduce from it a knowledge of the entire nature of the beings to which it is applied. Being vertebrated, they must be possessed of an internal skeleton; of a brain and spinal marrow, inclosed in a vertebral column ; of muscles exterior to the bones ; of four extre¬ mities only; and of the organs ot the first four senses, situate in the cavities of the head; with other relations not necessary to be here named. The greater portion of the surface of the earth is covered by the waters of the translucent sea; and wherever conti¬ nents and the larger islands protrude their rocky bulk, we find them coursed by flowing rivers, or intersected by la es and marshes. These present in their aggregate an enor¬ mous mass of waters, and afford protection and nourishment to myriads of living creatures, probably superior in number and in no way inferior in beauty, to those which inhabit the earth. On land, the matter susceptible of life is mainly employed in the construction and continuance of vegetable species ; from these, herbivorous animals draw their nourish¬ ment ; and this being animalized by assimilation, becomes an appropriate food for the carnivorous kinds, which scarcely amount to more than one-half of the terrestrial creatures of all classes. But in the liquid element, and more especially among the saline waters of the ocean, where the vegetable kingdom is so much more restricted, almost all organized substances are pervaded by animal life, and each lives at the expense of some smaller or feebler foe.’ There we meet not only with the greatest and most wonderful variety of forms, but also with the extremes in respect to size,—from the myriads of microscopic monads, which, but for artificial means, must have remained for ever invisible and unknown, to the ponderous whale, which surpasses, by twenty times, the bulk of the largest elephant. There, too, we may discover the majority of those magni¬ ficent combinations of organic structure, on the relations of which naturalists have established the distinction of classes, or great primary groups; in other words, the sea may be said to contain representatives of each; for, even among birds, those aerial creatures which usually inhabit so light an element, we find species so constructed as to dwell almost for ever on its waves. The mammiferous class is still more fully represented in the numerous tribes Introduc of seals, morses, manaties, and whales, all of which require 10“* a moist abode, and some of which immediately perish when deprived of it. Most reptiles are aquatic, many in¬ sects are so, more particularly in their larva state; and al¬ most all the Mollusca, the Annelides, the Crustacea, and Zoophytes, four great classes, which on terra firma are few and far between, exist in countless numbers m the waters of the ocean. Hence that ancient dictum recorded by Pliny, “ Quicquid nascatur in parte naturae ulla, et in man esse ; praeterque multa quae nusquam alibi. But amongst all the teeming wonders which vivify the vast expanse and liquid depth of waters, none so predo¬ minate, or are so truly characteristic, as the subjects of our present treatise; nor are any more worthy of our careful consideration, whether we regard the beauty or eccentri¬ city of their forms, the metallic splendour of their colours, or the innumerable benefits which, through the foiesig t of Providence, they confer upon the human race. We therefore deem it incumbent upon us to exhibit an ample view of the present condition of Systematic Ichthyology, but before doing so, we shall endeavour to add to the in¬ terest of the subject by a few general observations. We may state, in the first place, that we here intention¬ ally refrain from any bibliographical inquiry, or historical exposition of the progress of Ichthyology. If such were complete, or even ample, it would occupy too much of that space which we deem more usefully devoted to the actual condition of the science; and we more willingly set that department aside, when we consider how per¬ fectly it has been presented by Baron Cuvier.“ vv e shall, however, briefly allude to what may be regarded as the principal epoch in the progress of Ichthyology During many remote ages it consisted, in common with all the kindred branches of human knowledge, of nothing more than a few partial and disjointed observations. Aristotle, about 350 years before the Christian era, made some pro¬ gress towards connecting these together as a body of doc¬ trine ; but still it was a feeble body, reposing upon truths (perceived indeed with surprising skill when we consider the scanty data) as yet obscurely known and vaguely ex¬ pressed owing to the entire absence of all proper standards for the distinction of species. For more than eighteen hundred years ensuing, the writers on natural history can scarcely be regarded in any other light than as either copiers or commentators of Aristotle; but about the mid¬ dle of the sixteenth century, Belon, Rondelet, and Salyiam, the true founders of modern Ichthyology, made their ap¬ pearance (we mean as authors), by a singular coincidence, almost precisely at the same tune,—the first m loo3> the second from 1554 to 1555, and the third from 1554 to 1558. Differing from their compiling predecessors, they saw and examined for themselves, and made drawings from nature, if not with the elegant accuracy of modern days, at least with a recognisable exactness. \ et, true to the ge- 1 From a/«/!., and Xoysj, a discowm. _ . ,v . ;n thp first volume of the great though 2 See the Tableau Historique des Progres de Vhhtyologie, depute son engine jusqu a noe f , buvon(i our predecessors in ency- unfortunately uncompleted work, the Hietoire Naturelle des Poissons. \\ e deem ourse ^ albout enter, the volumes of Baron clopaedic labour, in having as a guide in so difficult a subject as that on w,hic^ 1 have availed ourselves of the labours of its Cuvier’s and M. Valenciennes’ signal publication. As far as this great work extends . . s ampiy as our limits w'ould authors, and have endeavoured to present the general and miscellaneous information sea er^ g^ ’ P ^ the present revisal permit, and in a form and sequence the most advantageous to those unacquainted with the Comparative Anatomy and Phy !,f this treatise we have also borrowed freely from the writings of our British Cuvier, whose “al eiinlmy of fishes, and siology of Fishes, forming part of his Hunterian Lectures, gives the fullest and most accurat /a(,knowledgments toVr Couch, the most philosophical account of the skeleton, that have hitheiYo appeared We beg al^o to r' ^ t Qn BrJsh Fishes is facileprinceps acute discoverer and desenber of new species frequenting the Cornish coasts, and Mi i airen, wnose among works illustrative of local Ichthyology. ICHTHYOLOGY. 205 Introduc- nius of their time, they continued to attach much more tion. importance to the ascertainment of the names which the species bore in the classical pages of antiquity, than to the composition of their history, as it were afresh, by the light of nature and their own knowledge. Never¬ theless, they rectified as well as extended the observations of Aristotle, and laid a positive foundation of the subject, by figures and descriptions of a certain number of well- determined species. About the close of the seventeenth century, Willughby, and his illustrious friend John Ray, gave for the first time a history of fishes, in which the species were not only clearly described from nature, but distributed in accordance with characters drawn solely from their structure, and in which we are no longer unneces¬ sarily burdened with inapplicable passages from either Greek or Roman writers. Finally, about the middle of the eighteenth century, Artedi and Linnaeus completed what the others had commenced, by establishing well- defined generic groups, consisting of ascertained species precisely characterized. From that period it may be said that no radical defect existed, nor any obstacle in the way of a gradual perfecting of the system, which could not be overcome by zeal, accuracy, and perseverance. Never¬ theless, it is to the genius of Baron Cuvier that we owe the gigantic stride which has been made in our own more immediate days. It is only by a profound study of the whole animal struc¬ ture that we can, to the extent of our limited intellect, correctly appreciate that part of the works of the great Creator, and get some insight into the branching and anas¬ tomosing affinities by which the almost numberless kinds of living beings are linked together. Many years spent in anatomical investigations gave Baron Cuvier such a know¬ ledge of the mutual dependence of the various parts of the organism of each of the numerous species which came under his observation, that he was able, from the inspection of a single bone, to reconstruct, mentally as it were, the animal to which it had belonged, and to assign the species its place in the system of nature. This great step in the history of Zoology placed its discoverer in the first rank of the cultivators of the science. In none of the greater di¬ visions of the animal kingdom were Cuvier’s labours, in forming a natural arrangement of the species, of more value than in the class of Fishes, the lowest of the vertebrata, or of that division of animals whose proper character consists in the possession of a central bony axis on which the soft parts are sustained, and from which the motive powers diverge. The Latin word used above has been adopt¬ ed into the English scientific language, though by many the more Anglicised term of “ vertebrals” is used, and we call the internal chain of bone the vertebral column, while its several successive component joints are named “ vertebrae.” The German equivalent of vertebrata is “ wirbelthiere.” We must remark, at the outset, that neither this term of Vertebrata, nor any other definition of a group which the ingenuity of man has hitherto devised, is logically correct. In Mammals, indeed, the highest class of the division, the internal bony frame is strong and massive, and fitted to support the limbs, by which, with the firm earth for a ful¬ crum, the animal moves through a medium greatly lighter than itself. In Birds, too, constituting the second class of the division, the bones of denser texture but more slender form and often hollow, are admirably fitted for sustaining the powerful muscles exercised in the maintenance of ex¬ tended aerial flight; and in both classes, the turning joints of the vertebral column, and more especially of the cervical portion of it, are adapted to the various motions of the ani¬ mal, and for enabling it to rotate its head from side to side, Introduc- and survey whatever comes within its field of vision. As tI0n‘ we descend to the less highly organized vertebrals, we come to other and remarkable modifications of the spinal column. In the third class, or the Reptiles, there is one order, namely, that of the Ophidia, or Serpents, whose locomotion is performed by creeping without external limbs, and solely by the flexibility of the vertebral column and the muscles attached to it, and to its appendages the ribs. The verte¬ brae are accordingly much more numerous in these animals than in any others, and their motions on each other more extensive. In another group of the same class the vertebrae of the body are soldered together by bone, and power of motion is preserved only in the neck and short tail. A third group, named Amphibians, are fishes in their embryo or tadpole condition, and undergo a kind of metamorphosis in becoming terrestrial and air-breathing creatures. A fourth remarkable group, of which only a few species have been hitherto detected, presents, with much of the piscine form, the peculiarity of the existence of both gills and lungs, and a residence in water during life. In the Fishes, the proper subjects of this treatise, and the lowest class of ver- tebrated animals, there is a large group named by some authors Cartilaginei, or Chondropterygii, because the internal skeleton remains in the state of cartilage, the bony structure being wholly absent in some species, and in others only very partially present; and thus the precision of one part of the character of the vertebrata given above is im¬ paired. In certain of the Cartilaginei the joints of the column are obsolete, and flexibility is substituted for the turning motions indicated by the word vertebrae. These brief notices point at some of the difficulties which beset the zoologist when he endeavours to convey the knowledge he has acquired to others, by concise and definite phrases. Yet however difficult it may be to construct a correct de¬ finition, it is certain that the idea of the type of an animal group may be conceived in the mind, on the basis of exact observation and legitimate deduction, in proof whereof the reader is confidently referred to the works of Professor Richard Owen of the British Museum, and particularly to his treatise On the Archetype and Homologies of the Ver¬ tebrate Skeleton.1 The vertebrated animals agree in having a spinal chord or elongated bundle of nervous filaments running along the body, and protected by bony arches composed of the neural apophyses, or processes which rise upwards from the body or centrum of each vertebra. The anterior expansion of the spinal chord, named the brain, is most fully developed in the higher classes of vertebrals, and is comparatively very small in fishes whose encephalon has the character of a series of ganglions, or knots of nervous matter, arranged in single succession or in pairs. In the lowest known form of fish, the Lancelet, the whole vertebral column is merely a pulpy nervous chord invested by a membranous sheath ; and Pallas, the first describer of this animal, ranked it, in accordance with the progress that science had made in his time, among the Slugs. In all the vertebrals the vascular trunks and organs of digestion are protected by the inferior processes and diverging appendages of the vertebrae; and the type of this division of animated beings is essentially tetrapodal (fig. 1), though in some groups one or both pairs of limbs are either rudimental or absolutely wanting—ex¬ amples of these deviations from the ordinary type being most frequent in the- classes of Reptiles and Fishes. The four limbs are produced in lateral pairs; and in fishes the first pair are named pectoral fins, and the second pair, being situated on the ventral aspect of the fish, are called ventral 1 On the Archetype and Homologies of the Vertebrate Skeleton, 8vo. London, 1849. Also Report of the British Association, 1846 On the nature of Limbs ; itichard Owen, &c., 8vo. London, 1849. 206 Introduc- fins, even though their relative position,^ is the ca^m some tion. kinds of fish, should be in front of t le pe 5 Cheironectes caudimaculatus of the family of Lophiidi crives it its hardness. Of the and fishes the least; but there is great variety in this re-int^uc In£r- ^hS mosfShy "after in their bones, spect even in the same class, the bones of each species^ Osteology. Fi?. 10. Skeleton of the Perch. being adapted by their degrees of firmness, and hardness for or of a o* -r^raUs the shotto they have to sus?in. The difference depends ^ f f defined by the Professor to be chiefly on the quantity ot fluid matter in the cells an seaments of the endo-sheleton which constitute of the bone. In a note theZttofSX L pro«c,ing ca.u.ts of fte Ker- cod, after die fluid portions had bee^evapor ^ aJVMCular trunis. such a segment may also sup- flufd than those of the other classes of vertebra^ P»^f ^"oT^^^^0*0?^ »teSLtasSucf ofS p ^ mucus, yields no f"“hf" rSf Xofd 0^0"^1. T^orX^ ilnSX^t^tmlaSginousfoun or transverse processes ;± T.oo p'eurapo^ses or costal o , c l—T'Vio unneaifipfl skeleton of dation of the bones of beasts. The unossified skeleton of the Lamprey holds only H per cent, of earthy salts. In the vascular canals, which are permeated by the vessels that deposit the bone and carry on its circulation, there is usually some oil, which is composed chiefly of oleine, and J i • . 4-1 •»✓'vv\ rvr-riHnr'OG n PlP 51 Pin. processes; 5. Two hcemapophyses, which form, with the centrum, a canal for lodging the central organ and large trunks of the vascular system. This canal is on the ventral, that is, the opposite side of the centrum to the neural one, and is less regular and more interrupted. 6. A neural usually some oil, which is composed chiefly of oleine, and ““ ^^^“/ihe neurapophyses, or is interposed is easily concerted into soap, and P™^nce^j> ^ ^ ^ tl d is very conspicuous in the figure glycerine, and a minute portion of margaric acid. It has odour, and for the most part a yellow colour. In the Belone and Lepidosiren it imparts a deep green colour to the bones. The bones of fishes continue to grow in size almost throughout life. , r j * -i ^ The limits of this treatise do not admit of a detailed ac- spine, which ciuwns a between their tips, and is very conspicuous in the figure of the skeleton of the perch, as it is in most fishes. <. A hcemal spine. 8. Two diapophyses or upper (anterior or proximal in fishes) transverse processes ot human anato¬ my; and, 9. Two zygapophyses or oblique processes. In fishes a complete typical vertebra can only be ob- . „ i. <4^ ✓wOnmn thp hflpma- The limits of this treatise do not admit of a detailed ac- n s • i ^ , rest Gf t}le column the haema- count of the skeleton and other parts of the st^cture o a1^ l s Absent or unossified ; their haemal canal fishes, of all which in connection with reingTrmed by of the parapophyses The marks on the homologies and analogies of the .everal part g ^ is governed by the number of pairs of ichthyic structure with the corresponding parts of the ^f^te w1th the spinal chord, and varies other vertebrals, the student will find a full account in of nerves that unite ^ i ^ numerous in the Professor Owen’s Lectures on the Comparative Anat°™J 1 0r serpentiform Apod™, and some Plagiostomi, and Physiology of the Vertebrate Animals. So comj Plectoqnathi. In many species they are a work, so easy to be procured, renders it unnecessary o and few n ^ of vertebral introduce more anatomical details here than are absolute y , J . y rmanentiy represented in the lowest requisite for the understanding of the systematic review o eve \ Lancelet which is at the bottom of the the class which follows ; and these we shall borrow from e s • ^ vertebral column consists of a gelatino- work referred to, as being the best authority existing. ’ . , j -t membranous sheath. In the Lam- The first step in the knowledge of the skeleton of a fish, cellular chord and its membranou. 1 Chemical composition of bones of the cod after drying 57.29 Phosphate of lime with trace of fluate 4.'90 Carbonate of lime Phosphate of magnesia T,,g Sulphate, carbonate, and chlorate of soda Gluten and chondrin Oil 2-00 100 00 Bibra, Owen's Lectures, &c. ICHTHYOLOG Y. 209 Introduc- prey, cartilaginous arches and spines are added above the ntion. “chorda,” in the membranous wall of the neural canal, Osteology, and in the tail also beneath it. In the Sturgeon and Chi- Wv*^ mgera the bases of the cartilaginous arches inclose the “ chorda.” In the Lepidosiren, the neural and haemal arches and their spines are ossified, but the centrums are still con¬ fluent as a dorsal membrano-gelatinous chord ; and Agassiz has shown that this was the condition of the vertebrae of the most ancient fossil fishes—those of the Silurian and Devonian rocks. In many Sharks and Rays the “ chorda” is encroached upon by osseous or cartilaginous convergent lamina;, and by concentric, successively shorter, centri- petally developed cylinders, and is thus reduced to a string of gelatinous beads, each bead occupying the interspace between the opposed concave surfaces of the vertebral bodies. This moniliform state of the “chorda” is per¬ sistent in most osseous fishes; whilst in some others the gelatinous biconical segments of the “ chorda” are insulated by the completed centripetal process of ossification; and in one genus, the Lepidosteus, they are converted into osseous balls, fixed to the fore part of each vertebral body, which plays in the concavity or cup of the vertebra next in advance. The slightly compressible jelly-bags that fill the concave opposing articular surfaces of the vertebrae are admirable contrivances for facilitating the motions of the fish. The neural and haemal arches and spines are bony in all osseous fishes; and in all fishes chondrification and ossi¬ fication of the vertebral column commences in these arches. The skeleton of fishes presents many instances of what Owen terms “ vegetative repetition of perivertebral parts.” There being no distinct neck in fishes, we find no peculiar cervical vertebrae, the series posterior to the head consist¬ ing of abdominals and caudals. With the former the ribs are connected, and in the latter the haemal canal is formed by the deflection and union of the parapophyses, as men¬ tioned above. The pleurapophyses, or ribs, are generally articulated in fishes to the ends of the parapophyses, but in Platax and Poh/pterus they articulate with the bodies of the vertebrae. In the Salmon and Dory they continue to be attached to some of the parapophyses after these are bent down in the tail to form the haemal canal and haemal spines. The Diodontidee, Ostracionidce, Fistularidce, Syngnathida, Cyclopteridce, and Lophiidce, are destitute of ribs. Slender supplementary ribs often issue from near the head of the ribs, passing outwards and backwards from be¬ tween the lateral muscles. Professor Owen names them “ epipleural spines.” They are highly developed in the Salmonidce, Clupeidce, and Scomheridce. In the common Herring, dermal bones are connected with the lower ends of the ribs, and have been called, though erroneously, ster¬ nal bones, since they do not belong to the endo-skeleton. In osseous fishes, imposed above the proper neural spines, there is a second row of spines belonging to the dermo- skeleton, of greater or less extent, and serving to support the dorsal fin or fins. From their bases other spines of an inverted shape usually descend into the intervals of the neural spines, and are hence named by Owen “interneural spines.” These interneurals are sometimes in lateral pairs, as in the PleuronectidcB, the Chcetodontidce, Zeidce, and some other compressed fish. The modifications of the dorso-interneural and dermal spines are repeated on the ventral aspect, posterior to the anus, producing inter-haemal and dermo-haemal spines which support the anal fin. Each dermal spine or ray is either readily divisible into two laterally, or presents a furrow in¬ dicative of a tendency to such a division. The caudal fin ‘is extended also on compressed intercalary and dermal spines, diverging from a few coalescent and abbreviated . caudal vertebrae. In the base of the caudal formed of these elements, the haemal spines are more developed than the neural ones in very many species, as in the Salmonidce, and YOL. XII. then they press upwards the short and almost obsolete verte- Introduc- bral centra which form the tip of the spinal column, and into which the spinal marrow is not extended. This larger de- v 8 eo °ey/ velopment of the haemal processes elongates the upper lobe v'"-' of the fin, and gives a very unsymmetrical form to the caudal of Sharks, Sturgeons, and Elephant fish. Fishes pos- Fig.H. Hemiscyllium trispeculare, Australian shark of the family of Scylliidce. sessing such a caudal are named by M. Agassiz “hetero- cercal;” and those with a symmetrical caudal fin he deno¬ minates “ homocercal,” including, however, in the latter group the existing fish wherein the obliqueness of the cau¬ dal vertebrae does not affect, in a decided way, the shape of the caudal fin, the Sal/nonidce, for instance, being homo- cercals. Among the palaeozoic fishes the heterocercal fishes greatly predominate; all that have been found in the magnesian limestone, and in older strata, having the superior lobe of the tail prolonged. The only existing osseous fishes that are recognised t>y M. Agassiz as heterocercal belong to the genus Lepidosteus. The size, number, and shape of the vertical fins depends on the development and grouping of the accessary and in¬ tercalary spines, the proper neural and haemal spines of the endo-skeleton showing no direct indication of the existence or position of those fins; but it is convenient to notice them in connection with the vertebral column, as the systematic arrangements of ichthyologists have had much reference to the number, relative position, and condition of the rays of those fins, in regard of their being simple and spinous, or jointed and forked. We have already noticed the terms Malacopterygian and Acanthopterygian as derived from these varieties of structure. Species occur among the Golnidfe and some other families of fish, in which there is much difficulty in deciding to which of the two groups they belong. In the Lancelet and Lamprey, the dorsal and cau¬ dal fins are simply cutaneous folds, with scarcely distin¬ guishable soft fibres for rays. Synbranchus gutturalis, and Channomurcena, have nearly obsolete rays at the tip of the tail only; and in Gyrnnomurcena the folds as well as rays are wanting. The interneural and dermal spines seldom coincide in number with the neural spines. They are often more numerous, but more frequently less numerous. The sucking apparatus on the head of the Remora is an assem¬ blage of peculiarly modified and connected dermal spines. Great development of the dermal spines often renders Fig. 12. Centriscus humerosus of the Fistularidce, representing in the Australian seiis the Mediterranean “ Snipe-fish.” . ' . ■ ■ them powerful weapons of defence, as in Trachinus. The Chimcerce, Cestraciom, Piked Dog-fish, and Batistes, are 2 D c 210 ICHTHYOLOGY. Introduc- furnished with a stont bony spine at the front of the dor- tion. sai fin; and the Sticklebacks (fig. 13) have curious sculp- Osteology. Fig. 13. ansterosteus insculptus, discovered by Sir Edward Belcher in the h'gh lati- t iide of 77°, at the northern outlet of Wellington Sound, when in search o Sir John Franklin. tured bony spines in the ventrals as well as in the dorsals. In most Siluridce the pectorals are supported by a strong and dangerous spine. Many of the rays have detached serrated spines on the upper part of the tail; and in palae¬ ontology similar spines, named “ Ichthyodorulitesare the sole indications remaining of the plagiostomes of for- are remarkable among bony fishes for these dermal wea¬ pons. Introduc- tion. Osteology, Fig. 14. Monocentris Japonica. mer epochs. The Siluroids and Trigger-fish (Bahstes) Fig. 15. Skeleton of a Perch’s Head. That the skull1 (fig. 15) consists of a series of four vertebrae modified for containing the cerebral enlargement of the anterior end of the nervous column, has been most fully demonstrated by Professor Owen. Each is divided into a neural arch with which the centrum and parapophyses are more immediately connected, and a hcemal arch with its appendages. A. Beginning next the trunk, the following are the names of the neural arches in the order of their succession : —I. Epencephalic arch. II. Mesencephalic arch. III. Prosencephalic arch. IV. Ilhinencephalic arch. aa. The haemal arches are,—1. Scapular or scapulo-cora- coid. 2. Hyoid or stylo-hyoid. 3. Mandibular or tympano- mandibular. 4. Maxillary or palato-maxillary. The appen¬ dages of the haemal arches are,—1^, The pectoral. 2d, The branchiostegal. 3c?, The opercular. Ath, The pterygoid. 1 t? ib, 0!,kP of more clearly exhibiting the relations of the different members of the osteological system, and to furnish a key to i For the sake of more cdeaHy ^ of the of the skeleton as fixed by 0wen, with Cuviers synonyms. 8c!ieZtescentrui; n. neurapophysis ; s. spine; VJ. par apophysis ; pi. pleur apophysis ; h. hypophysis; hs. hamal spine ; d. dzverg- ing appendage. The numbers after the French names have reference to figures 10, 15, 20, and 21. ENDO-SKELETON. OCCIPITAL VERTEBRA. Owens Names. Basi-occipital Exoccipital Supraoccipital Paroccipital Supra-scapula Scapula Coracoid Clavicle Humerus Ulna Radius Carpals Metacarpo-phalanges c. n. par. | V1- Cuvier's Names. Basilaire Occipital lateral Interparietal Occipital externe Surscapulaire Scapulaire Humeral 5. 10. 9. 8. 46. 47. 48. Troisieme os de 1’avant bras Radial Cubital Os du carpe Rayons de la pectorale 52. 51. 64. 65. PARIETAL Basi-sphenoid c. Alisphenoid «. Columella Parietal *• Mastoid par. Stylohyal pi* Epihya! ) h Cerato-hyal J Basi-hyal S Glossohyal V ?**• Urohyal ) Branchiostegal VERTEBRA. Sphenoide posterieur 6. Grande aile du sphenoide 11. Parietal • • Mastoidien 12. Styloide 29. Grandes pieces laterales 37. 38. Petites pieces laterales 39. 40. Os lingual 41. Queue de 1’os hyoide 42. Rayon branchiostege 43. Presphenoid Entosphenoid Orbito-sphenoid Frontal Post-frontal Tympanic Epitympanic Mesotympanic Pretympanic Hypotym panic Mandible Articular Surangular Angular Splenial Dentary Preopercular Opercular Subopercular Interopercular Vomer Pre-frontal Hasal Palatine Maxillary Pre-maxillary Entop ter y gold Pterygoid FRONTAL VERTEBRA. } c. n. par. pi. h. hs. d. Sphenoide principale Aile orbitaire Frontal principal Frontal posterieur Temporal Symplectique Tympanal Jugal Machoire inferieure Articulaire Surangulaire Angulaire Operculaire Dentaire Pre-opercule Operculaire Sous-opercule Inter-opercule NASAL VERTEBRA. c. Vomer n. Frontal anterieur s. Ethmoide pi. Palatin h. Maxillaire superieur hs. Inter-maxillaire Pterygoid ien interne Transverse 5. 14. 1. 4. 23. 31. 27. 26. 35. 36. 37. 34. 30. 28. 32. 33. 16. 2. 3. 22. 18. 17. 25. 24. ICHTHYOLOGY. 211 Introduc- B. The bones of the Splanchno-skeleton constitute in the tion. skull,—a. The ear-capsule or petrosal and otolite. b. The Osteology, eye-capsule or sclerotic and pedicle, c. The nose-capsule or ethmoid and turbinal. d. The branchial arches. C. The bones of the Dermo-skeleton belonging to the skull are,—a. Supra-temporals. /6. Supra-orbitals. y. Sub¬ orbitals. S. Labials. A. I. The Epencephalic arch consists of the basi-occipital, on which there is an excavation similar to one on the first abdominal vertebra, and with which it is articulated through the intervention of a capsule filled with jelly. This articular cup varies from a deep conical excavation common to many fish, to the almost flat surface which it presents in the Holibut, and, what is extremely rare, to a convex surface as in Fistularia. In the Carp, the under surface of the basi- occipital forms a broad triangular plate, on which there is planted the large upper pharyngeal grinding tooth. This bone is the centrum of the arch. The ex-occipitals or neurapophyses are articulated one on each side to the basi- occipital, and, in most fishes, they expand on the upper surface of that bone, so as to meet and support the medul¬ lary column; but sometimes a space is left between them, as in the Lepidosiren, whose basi-occipital completes the fora¬ men magnum of the skull. The par-occipitals form the upper lateral curve of the arch, and are wedged in between the ex-occipitals and the supra-occipital, which forms the key of the arch, and raises a strong compressed crest-like spine from the whole length of its mesial line ; a transverse supra-occipital ridge coming from each side of the base of this spine runs outwards laterally to the external angles of the bone. The supra-occipital is separated from the fron- tals in the Salmonoid, Clupeoid, Cyprinoid, Muraenoid, and Salamandroid families; but, in the majority of fishes, it runs forward between the parietals to join the frontals. In Lepidosteus, it is itself divided by a median suture. In greatly compressed skulls, the occipital spine is usually very lofty ; and, in Ephippus, its peripheral edge swells out like the crest of a helmet, whence the fish is named the Light- horseman. In depressed skulls, on the contrary, the spine is low and merely projects backwards, as in the Pike and Salmon ; while in some it is wholly obsolete, as in the flat-headed Remora. In the unsymmetrical skulls of the Pleuronectidce, it is pushed from its usual place by the par- occipitals, and one of its lateral plates is not developed. In broad depressed skulls the par-occipital forms a strong Introduc- crest, and exceeds the ex-occipital in size. In Synodus, tion- Callicthys, and Heterobranchus, the par-occipital is visible Oste°logy- only at the back part, not on the upper aspect of the skull. v'’"-" The outer projecting process supports the upper fork of the first piece of the scapular arch, sometimes, as in Ephippus, by a distinct articular cavity. The members of the occipital vertebrae are the parts which are commonly most completely ossified, and in Polypterus they are anchylosed into one piece. Both the par-occipital and the ex-occipital are excavated for lodging the posterior and external semicircular canal of the enor¬ mous internal organ of hearing, and the acoustic capsule, or petrous bone, as it is named from its hardness, is interca¬ lated between the par-occipitals and the ali-sphenoids. In the Carp, a chain of ossicles connects the air-bladder with the organ of hearing. II. The Mesencephalic arch has for its centrum the basi- sphenoid, which is always connate with the pre-sphenoid (belonging to the next arch), and forms with it a long sub- triedral bone (basi-pre-sphenoid), usually split or forked posteriorly, more or less expanded beneath the cranial cavity, and then continued forwards, along the base of the inter-orbital space to near the fore part of the roof of the mouth, where it terminates by a cavity that receives the pointed end of the vomer. This end of the basi-pre- sphenoid is twisted up in the Pleuronectidoe. The longer and narrower the skull, the longer in general is the basi- pre-sphenoid. Rarely does any portion of it show on the floor of the cranial cavity, but in the Cod a small part supports the pituitary sac ; in Fistularia a transverse ridge of it appears within the cranial cavity, and in some other fishes it sends a small process up on each side. The ali- sphenoids or neurapophyses of this arch are articulated firmly to the sides of the basi-sphenoid, their bases usually expanding over this bone so as to meet and form part of the floor of the cranial cavity. In some fishes, as in the perch and carp, these expanded plates of the bases are raised from the basi-sphenoid so as to form a sub-cranial canal which exists in the Salmonoids, Sparoids, Scombe- roids, and is very remarkable in Ephippus, and most fishes that have lofty compressed skulls. It exists in some Clupeoids, but not in the Salamandroid fishes. In deep and compressed skulls the ali-sphenoids are narrow and Ectopterygoid Malar Squamosal SPLAXCHNO-SKELETON. CAPSULES OF ORGANS OF SENSE INTERCALATED WITH THE CRANIAL BONES. Otosteal} -^cous^c Rocher 13. Ethmoid and Ethmo-turbinal Spheno'ide anterieur 15. Turbinal Nasal 20. BRANCHIAL ARCHES. Hypo-branchial Piece interne de partie in- ferieure de 1’arceau bran- chiale 57. Cerato-branchial Piece externe de partie in- ferieure de 1’arceau bran¬ ch iale 58. Epi-branchial Partie superieure de I’arceau branchiale 61. Pharyngo-branchial Os pharyngien sup6rieur 62. DERMO-SKELETON. Supra-orbital scale-bone Sur-orbitaire Supra-temporal scale-bone Sur-temporal 72. Sub-orbital scale-bones Sous-orbitaires 19. Lachrymal Lachrymal 19. Labial Labial ENDO-AND EXO-SKELETON Abdominal vertebras Caudal vertebrae OF THE BODY AND TAIL. Vert&bres abdominales 67. 68. Vertebres caudales 69. Centrum Neurapophysis Neural spine Interneural spine Dermo-neural spine Zygapophyses Parapophyses Haemal canal Haemal spine Interhaemal spine Do., aggregated at base of caudal fin Dermo-haemal spine Spinous rays Soft-jointed or branching rays Pleurapophysis or rib Epipleural spine Ventral fins, being the haema- pophysis with diverging appendage of the last ab¬ dominal vertebra Pubic bone in fishes ; the re¬ presentatives of thefemoral, tibial, and tarsal bones, are wanting Metatarso-phalangeal jointed rays Corps du vertebre 67. 68. 69. Partie annulaire Apophyse epineuse c. Interepineux 74. Rayons dorsales 75. Apophyses articulaires Apophyses transverses Anneau inferieur Apophyse epineux inferieur Interepineux 6. Plaque triangulaire et ver- ticale 70. Rayon de 1’anale et du cau¬ dal inferieur 78. Rayons epineux ou aiguil- leus 75. Rayons articules, mous ou branchus 71. 75-82. Cote 72. Appendice or stylet 73. Nageoires ventrales abdomi- naux et subbrachiens. Un seul os representant 1’os innomine, la cuisse, la jambe, et le tarse 80. Rayons mous du nageoire ventrale 82. 212 Introduc¬ tion. Osteology. 1 C H T H Y high plates, while in low and flat heads their longitudinal axis is the longest. In skulls ot the ordinary form, they are sub-circular, and are perforated as in the Carp, or this pti- foration may be replaced by a deep anterior notch, as in the Cod. Its connections vary with its relative size, and, according as the petrosal, which interposes between it and the ex-occipital, is greater or smaller or wholly wanting. The parietals or spine of this arch are most commonly two in number. In the Cyprinoid and Salamandroid fishes, they unite above by a longitudinal suture (the sagittal); in the Cyprinoid Catastomi a mesial rectangular cartilaginous plate interposes between the ossified side plates ; in the Sahnonoids they soon coalesce ; and in some Siluroids they coalesce with the supra-occipital as well as with each other. In the Pike, Perch, and Cod, and most osseous fishes, the parietals are separated from each other by an anterior pro¬ longation of the supra-occipital. The mastoids or parapo- physes of the parietal vertebra are interposed between the ali-sphenoids and parietals, and project outwards and back¬ wards farther than the par-occipitals, forming the second strong transverse process at the side ot the cranium. Ihis process is developed from the outer margin of the bone. The inner side of the bone lodges part of one ot the semi¬ circular canals. The great cavity named “otocrane,” which lodges the proper acoustic capsule or petrosal, whether osseous or cartilaginous, is formed by the ex-occipital, par- occipital, ali-sphenoid, mastoid, and sometimes the parietal and supra-occipital. III. The Prosencephalic or frontal arch is based on the pre-sphenoid already described in connection with the basi-sphenoid. The orhito-sphenoids or neurapophyses of the frontal vertebra are usually square, but sometimes semi¬ circular or semi-elliptic, as in the Cod; larger in the Mala- copteri, but very small usually in the Acanthopteri, and cartilaginous in the Sclerogenidce. The olfactory nerves pass out of the skull by the superior interspace of the orbito-sphenoids, and the optic nerves by their inferior interspace or by a direct perforation. The mid-frontal bone completes this arch above, and always enters into the formation of the cranial cavity though its major part foims the roof of the orbits. It is single, and sends up a median crest in the Cod, the Ephippus, and some other fishes, but is more commonly divided along the median line. Each ot the halves sends up its own crest in the Tunny. In the Salamandroid fishes, each frontal sends down a vertical plate to the sphenoid, thus forming a canal through which the olfactory nerves run. The side walls of this canal make a double bony partition between the orbits. The post-frontals or parapophyses of the frontal vertebra partly underlie the mastoids, and complete their prominent crest. IV. The Rhinencephalic arch terminates the axis of the skull anteriorly, and protects the olfactory ganglions and nerves. The centrum of the nasal vertebra is named the vomer. Its posterior point is wedged into the under part of the pre-sphenoid; it expands and becomes thicker, an¬ teriorly, where its lateral angles are articulated to the pre- frontals. Its upper surface supports the nasal bone, and its under surface, which enters into the composition of the roof of the mouth, is in many fishes dentiferous. Ihe same is often the case with the palatine bones, which abut against it laterally, and also form part of the root ot the mouth. The presence or absence of these teeth has been made much use of for characterizing genera and large groups of the osseous fishes. In Lepidosteus the vomer is cleft by a median fissure. In Polypterus it is confluent with the basi-sphenoid. The pre-frontals or neurapo¬ physes of the nasal vertebra defend and support the ol¬ factory ganglions, bound the orbits anteriorly, give a surface of suspension to the palatine bones, and through them for the palato-maxillary arch; and they also give attachment to the large pre-orbital or lachrymal scale bone when this 0 L 0 G Y. exists. In the Cyprinoids and most Clupeoids the pre- Introduc- frontals form part of the interobital septum. In the Con- tion. geridce we recognise the pre-frontals in the confluent parts ^oiogy. of the nasal vertebra by the external groove conducting v''*’’'' the olfactory nerves to the nasal capsules, and by the in¬ ferior process from which the palatine bone is suspended. In the Murcenidec also the pre-frontals are plainly confluent with the nasal bone, and furnish the well-marked articular surfaces for the palato-maxillary bone. In the Cod the palatine arch is chiefly, but not wholly, suspended to the pre-frontals. The nasal-bone or spine of the most anteiior arch of the skull is usually single, and terminates forwards in a thick obtuse extremity. In the Sahnonoids and some other fishes, it is broad, but not deep; in Istiophorus it is long and narrow; in the Discoboles and Lophobranchii it is a short vertical compressed plate, and it is wanting in Lo- phius and Diodon, or merely membranous. It is articulated above and behind to the frontals and pre-frontals; and be¬ low, either directly or by cartilage, to the vomer. In the Flying Gurnard it has no immediate connection with the vomer; but this is a rare exception. In the Salamandroid fishes, the nasal is divided by a median suture. 1 he horn¬ like projection from the forehead of JSaseus is formed Fig. 16. Naseus longicornis, one of the Theutyidw. chiefly from the frontal bone, a small nasal being aiticu- lated beneath. This nasal is trifid anteriorly; its lateral divisions articulating with the pre-maxillaries, as in Citha- rinus. The turbinal bone or osseous capsule of the nose, belonging to the splanchno-skeleton, is situated at the side of, or above the nasal; the pre-maxillary and maxillary bones are usually attached to its extremity through the medium of cartilage. In the Mureenidce, the normal ele¬ ments of the nasal vertebra coalesce into a single bone. The spine of this vertebra or nasal bone forms the usual obtuse extremity beneath the skin of the upper part of the snout, and it is dentiferous, as in the Lepidosiren; it is intimately confluent anteriorly with the centrum or vomer, the limits being indicated by the interruption of the median series of vomerine and nasal teeth. This completes a compendious view of the neural arches of the four cranial vertebrae which have for their primary function the protection of the ganglionic brain, in which the spinal chord ends anteriorly. From the complete os¬ seous skull of a fish, there are many descending modifica¬ tions, until we come to the vermiform Lancelet, which wants the cerebral expansion altogether; the gelatinous chorda dorsalis” being terminated by a tapering end, invested by a membrane, without any addition of cartilaginous or osseous b. Sense capsules of the splanchno-skeleton intercalated with the neural arches. Some of these have been already noticed. In the Ammoccetes, cartilage is developed for the protection of the acoustic organ, in a skull, otherwise mostly fibro-membranous. (a.) The bones entering into the formation of the otocrane for the lodgement of the labyrinth have been named above; but it is the petrosal which is the bone specially designed to form the acoustic capsule, though in fishes it is less confined to that function than in the higher vertebrals in which it exclusively enve¬ lopes the labyrinth. Its ossification commences late in the osseous fishes. It is very small in the Cyprinoids, and in them Cuvier describes it as a dismemberment of the ICHTHYOLOGY. In trod uc- mastoid; but in the Perch, where it is more developed, he tion. recognises it under its proper name. In the Cod it has a Osteology, larger size, and the two otocranes are completely sepa- ^ rated from each other. b. The optic capsule or sclerotic investment of the eye is cartilaginous in the Chondropterygians and in semi- osseous fishes, but in most osseous fishes it is bony. An orbit for lodging the eye-ball is formed by the pre-sphenoid, orbito-sphenoid, frontal, post-frontal, pre-frontal and pala¬ tine hones; its wide outer opening is often circumscribed by the chain of sub-orbitals or scale-bones below, and less frequently by one or more supra-orbitals above. In the Shads, Erythrinus, Citharinus, Uydrocyon, Cyprinus, and many other Malacopteri, and in Synbranchus, the orbits are separated from one another by an osseous septum, but in general the septum is incomplete or wanting; in Lepi- dosteus and Polypterus it is double. c. The nose-capsule is formed by the ethmoidal which enters into the walls of the cranium, and the turbinal which belongs to the nose, other bones, as the vomer and nasal, being accessaries. The whole capsule is cartilaginous in cartilaginous and semi-osseous fishes, and the ethmoidal part continues so in many osseous fishes. The cartilaginous capsules and pituitary expansions are proportionally large in the Chondropterygii and Lepidosiren, communicating with each other in the latter by membranous slits; but in the higher fishes they form a pair. The turbinals in osse¬ ous fishes are generally thin, more or less elongated, scales situated at the sides of the nasal bone and ascending px-o- cesses of the pre-maxillaries. aa. The inferior or haemal arches of the cranial verte¬ brae are essentially four in number in the osseous fishes, and in most of these have radiating appendages. A special visceral system of bony arches, called “ branchial,” also exists in fishes for the support and movement of the gills. 4. Palato-maxillary arch. Of this inverted arch, the palatine bones are the piers, and their points of suspension are their attachments to the pre-frontals, the vomerine, and nasal bones. The arch is completed by the maxillary and pre-maxillary bones, the symphysis of the latter forming its apex. The palatine or pleurapophysis of the nasal vertebra articulates at its peripheral extremity with the maxillary, to which it affords a more or less moveable joint. In the Pax-rot fishes and Diodons the articxxlation is analo¬ gous to that of the mandible below, with the tympanic pedicle. In the Salamandroid fishes it is a fixed suture. In Mormyrus these ends of the palatines meet and unite at the mesian line. In fig. 19, representing the jaws of Alepisaurus, the palatines are seen to be strongly armed, each of them having two pairs of tall lancet-shaped teeth, one pair nearly under the nostrils, the second pair not so tall, further back, and closely followed by ten much shorter ones. The maxillary or haemapophysis of the nasal verte¬ bra lies between the palatine and pre-maxillary. On the extent to which these two bones enter severally into the orifice of the mouth, and on their dentiferous or eden¬ tulous conditions, many divisions of fishes made by ichthy¬ ologists are mainly founded. In the Salmonoids the max¬ illary joins to the lower end of the pre-maxillary, forming, Fig. 17. Coilia Playfairii, one of tlie Clupeidce of the China seas. together with it, the upper half of the border of the mouth, 213 and it supports teeth. The same form prevails with the Introduc- Clupeoids. In Thrissa and Coilia of this family the tl0"- pre-maxillary is very small, and the large dentiferous max- s 60 °^' illary is prolonged beyond the corner of the mouth (fig. 17). In the Plectognathi the two bones coalesce. In Lepidos- teus these bones also form a single dentiferous arch, but they are subdivided into many pieces, a condition which seems to have prevailed with the ancient Salamandroid fishes. It is dentiferous and lax-gely developed in Polypterus, but very diminutive in the Siluroids, and wanting in the Muraenidce. The pre-maxillary, or the haemal spine of the nasal ver- tebra, is more commonly directed transversely than longitu¬ dinally. Its nasal branch, or pedicle, is of unusual length in fishes with protractile snouts, such as the Menidce, Zeidae, Emmelichthys nitidus (Erythrichthys Schlegel), from Western Australia. Epibulus, Emmelichthys, and others. Commonly, its labial border is beset with teeth; and in many groups of fish it forms, with its fellow and the mandible, the whole mar¬ gin of the mouth, the maxillaries in that case lying in folds of skin. This extension of the pre-maxillary is well shown in the Alepisaurus, a predaceous Sphyroenoid; there it is closely set by a series of small teeth (fig. 19). The small bony piece above the maxillary in the Trout, Herring, and Pike, seems to belong to the series of mucous or scale bones. The diverging appendage of the palato-maxillary arch consists of the pterygoid and entopterygoid bones, which are the less constant parts of the arch. They are connate with the palatine in most Salmonoids and Eels, while Mu- raena wants the entopterygoid, and its pterygoid is discon¬ nected from the maxillary arch. Most fishes, however, have both bones. 3. The tympano-mandibular arch has the true inverted or haemal character, its apex formed by the epi-tympanics or pleurapophyses of the fi-ontal vertebra hanging down¬ wards below the vertebral axis of the skull. In most fishes, its lower end is bifid, and supports two inverted arches, the mandibular and the hyoidean. The meso-tympanic is articulated above to the epi-tympanic and pre-opercular, anteriorly to the pre-tympanic, and by its lower end to the 214 ICHTHYOLOGY. Introduc- hypo-tympanic, reaching almost to the mandibular trochlea. tion. jg thg symplectic,? of* Cmvier, and it is confluent in the Osteology. giiuroia, Munenoid, and some other fishes with the epi- tympanic. The pre-tympanic “caisse” or “os tympanicum” of Cuvier, receives, in its posterior margin, the fore part of the meso-tympanic, and the upper and fore part of the hypo-tympanic. It is confluent with the lattei in Conger and Murama, and it does not join either of these bones in the Lepidosteus. The hypo-tympanic bears the convex articular trochlea for the lower jaw upon its inferior apex. The Epibulus presents a remarkable, much elongated, and slender modification of it, carrying the lower jaw at an unusual distance from the base of the skull, and al¬ lowing it to swing backwards and forwards on its long pedicle as on a pendulum. In the Murcenidce the tympanic pedicle is a strong triangular plate affixed to the cranium by its base or shorter side, and carrying the mandibular joint backwards beyond the occiput. The mandible or lower jaw is the haemapophysis of the frontal vertebra, and completes the arch below by its ligamentous or bony sym¬ physis with its fellow. Each branch or half consists most commonly of two pieces, sometimes of three or more, the one articulated to the suspensary pedicle being the proper haemapophysis, and the extreme one completing the arch and supporting the teeth being the haemal spine. The diverging apparatus of the tympano-mandibular arch consists of the opercular bones of the gill-cover, which, by its movements, opens and closes the branchial aperture on each side of the head, thereby regulating the currents through the branchial cavity. It may be considered as a kind of short and broad fin. The first or most anterior, and the chief medium of attachment of the appendage, is the pre-opercular, which commonly has a crescentic or angular form. In the Cod it is forked above, and in the Sclerogenidce the enormously developed second suborbital scale bone crosses the cheek to be articulated to it. 1 he opercular is commonly the largest of the remaining pieces of this appendage, and is chiefly connected with the poste¬ rior margin of the pre-opercular, but very generally it is partially attached above to the outer angle ot the epi-tym- Fig. 20. Hyoid bone of the Perch. panic. In the LopJdus, its posterior margin is coasted a long slender fin ray, and the sub-opercular, which forms introduc- the posterior and lower angle of the gill-cover, carries out tion. the resemblance to a fin by its radiated structure. All the Osteology, framework of this fin has the form of rays in the Plagio- stomes. The lowermost piece, called the inter-opercular, is articulated to the pre-opercular above, the sub-opercular and angle of the opercular behind, and usually to the back parts of the mandible in front. In conjunction with the pre-opercular, it is more elongated in the very long head of Fistularia than the other two pieces of the appendage. It is wanting in the Siluri, and the sub-opercular is wanting in the Shad. In Murcena, the small opercular bones are articulated only to the lower part of the tympanic pedicle. The smoothness or serratures of the posterior edges of these bones, more especially of the pre-opercular, and the num¬ bers and situations of the spines which emanate from them, furnish characters to ichthyologists for the discrimination of many species and groups of species. 2. The hyoidean arch is suspended in osseous fishes, as we have already had occasion to say, to the mastoid, through the medium of a fork of the epi-tympanic bone; and its bony arch is completed by the two small, cubical basi- hyals. The anterior part of the arch is formed by the stylo- hyal, epi-hyal, and cerato-hyal, the first-named being joined at its upper end by ligament to the epi-tympanic, and the others descending from it in succession. The cerato-hyal is the longest and largest, and supports the diverging ap¬ pendix of the hyoidean arch named branchiostegals or gdl- cover rays, and on which the membrane that closes the branchial chamber is extended. The number of these rays varies greatly. They are only three, and these comparatively broad and flat in the Carps, while in Flops saurus they amount to more than thirty. They are of very great length in the Angler, and spread out the gill membrane like a great bag on each side of the head. Fig. 21. Gills of the Perch. In Pisoodonophis cancrivorus the branchiostegals are thirty-three in number on each side, very long, and as fine as hairs, and the curves they make in the branchiostegal membrane are different on the two sides of the head. d. The branchial arches, which appertain to the system of the visceral skeleton, succeed the hyoidean arch, and are more or less closely connected with its key-stone, the basi- hyals. Six of these arches are usually developed in em¬ bryo, and five are usually permanent, four of them supporting the gills, and the fifth circumscribing the opening of the gullet and beset with teeth. This last is called the pharyn- ICHTHYOLOGY. Introduc- geal arch, the rest branchial arches. The arches adhere by tion. their lower extremities to a chain of ossicles, and curving Osteology. as they ascend, nearly meet at the base of the cranium, to which they are attached by ligamentous and cellular tissue. Each of the first three branchial arches, independent of the basal key bones, or basi-branchials, consists of three or four pieces, which have a certain elastic or flexible movement on each other. The lowest of these pieces is the short hypo-branchial; the next, the long cerato-branchial, is grooved on the outside, and supports the dentigerous pro¬ cesses, or tubercles, named rakers. Above this is an epi- branchial similarly formed. To it, in the second and third arches, the short, broad, dentiferous epi-branchial is com¬ monly attached. The fourth arch consists of the cerato- branchial, the epi-branchial, and the pharyngo-branchial pieces. The fifth arch usually consists simply of the cerato- branchial element, but in Anabas it supports a pharyngo- branchial. This last-named bone is often expanded, and more or less dentiferous: it is termed by Cuvier “ the in¬ ferior pharyngeal bone,” and the upper dentiferous portions of the arches are called the superior pharyngeal bones.” In Coitus, these superior bones are blended into one piece. A peculiar development of the epi-branchial and pharyngo- branchials of the first two or three arches, serves the office, in a group of fishes, the Labyrinthibranchii, of retaining a supply of water for moistening the gills when the fishes are temporarily out of their proper element. 1. Scapular arch. This inverted cranial arch is attached to the par-occipital; or to that bone and the mastoid; or to the same bone and the petrosal, as in the Cod; or to the par-occipital and basi-occipital, being essentially the haemal arch of the occipital bone, to which it is constantly attached wholly or in part. In the Eels it is feebly developed, and only loosely suspended behind the skull; and in the Pla- giostomes it is removed further back to a distance from its proper vertebra. Its superior piece is the supra-scapula, then follows the scapula, and the arch is completed below by the union of the frequently very strong and firm coracoid with its fellow. The coracoids defend and support the heart, and give attachment to the diaphragm, which separates the pericardial and abdominal cavities. The scapular arch usually supports a diverging appendage on each side, constituting the pectoral fin. The pectoral fin rays are analogous to the fingers of the higher animals, the lowest ray, when the fin is laid back to the side of the fish, answering to the thumb. The bones which support these rays are homologues of the bones of the fore ex¬ tremities of the higher vertebrals, and have been named accordingly. In the Cod tribe, and most other fishes, there is, however, no separate representative of the humerus. The radius is of enormous size in the Lampris and in Flying-fish. It is anchylosed to the ulna in Silurus for the firmer support of the pectoral spine, and in Lophius, both radius and ulna are extremely small, and connate with the coracoid. The carpals, usually four or five, but sometimes only two, progressively increase in length from the ulna to the radial side. In the Wolf-fish they are broad flat bones. The metacarpals and phalangeals are in the Cod twenty in number, all soft-jointed, and sometimes bifurcate at the distal end. In the osseous fishes the pectoral fins present a series of modifications. In the Acanthopterygii the ulnar ray is a hard unjointed spine. In the Gurnards, Choridactyles, and several other genera of Sclerogenidce, the three lower rays are detached and free, and there is reason to believe that these rays are used like fingers as organs of touch when 215 the animal swims close to the sandy bottom of the sea. Introduc- The pectoral fins are very largely developed in the Exo- tion> ccetus; it is also large in Dactylopterus, Trigla, and Prio- 0steology- notus, as well as in several other forms of the Sclero- genidoe. In the Cod and Carp there is a single styliform bone, named the epi-coracoid, because it is attached to the upper end of the coracoid. In the Perch, and most other fishes, it consists of two pieces. In Centriscus scolopax, Argyrei- osus vomer and Siganus, it is joined by its lower end to its fellow, thus completing an inverted arch behind the sca¬ pular one. The epi-coracoids are absent or are very slender spines in the Wolf-fish, Mullet, Goby, Stickleback, Remora, Cepola, Uranoscopus, the Blennies, Siluroids, and Apodal fishes. The apodal Sandlance, however, possesses the epi- coracoids. Ventral jins. The rays of the ventral fins are supported by two bones, which are named pubic bones, and represent the lower part of an inverted haemal arch. In no fish is this incomplete pelvic arch directly attached to the vertebral column. In all fossil fishes belonging to deposits anterior to the chalk, the ventrals are placed towards the posterior end of the abdomen, and hence, and from the consideration of the position of the rudiment of the ventral in the em¬ bryo fish, it may be inferred that these pubic bones are the haemapophyses of the last abdominal vertebra. In Acan- thopteri the anterior ray of the ventral may be spinous. In the Malacopteri all the ventral rays are soft, multi- articulate, and bifurcate. The normal position of the ven¬ tral haemapophysis is under its proper vertebra, but the rela¬ tive length of the pubic bones in different fishes, places them under the abdomen, or pectoral fins, or gills; hence Lin¬ naeus’s division of the fishes into abdominal, thoracic, and jugular, and, when the ventrals are want¬ ing, apodal. Cuvier substituted the term subrachial for thoracic and jugular. The ventrals are better developed in the Pla- giostomes than in other fishes, and con¬ nected with this fin, in the male Plagio- stomes and Chimerce, there is the peculiar intromittent organ of generation named the “clasper.” mg.-xi. In the Gobies (fig. 22) and GW0_ United ventrals of Go- rhynchus, the ventrals are united to each Chinese fish, other by a membrane; and in Cyclopterus, Gobiesox, and Fig. 23. Lepadogasterpuniceus, a Discobole or Cyclopteroid. A sucking apparatus is formed round the basis of the ventrals. Lepadogaster (fig. 23), they so united as to form a suc¬ torial foot, by which these fish can attach themselves to a rock. We have allotted more space to the skeleton of fishes than our limits will permit us to devote to the rest of the ichthyic structure, because the soft parts and dermal system cannot be properly apprehended or referred to without a competent knowledge of the bony or cartilaginous endo- skeleton by which they are sustained.1 In adopting Professor Owen’s osteological system, we have thought it proper, to avoid mistake, we could; but as our extracts from his elaborate and exhaustive work are very compendious, and not his lectures, they are not marked by inverted commas as quotations. to use his own words as often as always in the order he pursued in 216 ICHTHYOLOGY. C. Dermal or Exo-skeleton. To this system the scales be¬ long, each being secreted, like a tooth, in a depres¬ sion or pocket of the skin, to which it adheres un¬ der the cuticle. They are very generally imbricated with the posterior end ex¬ truded and free, but the skin usually extends over the surface of the anterior end to a greater or less extent; or the scale may be entirely imbedded be¬ neath the cuticle. Pro- Fig. 24. A o-ocsi? rnnsidered A Cycloid scale of Lampanyctes (or Mycto- tCSSOr Agassiz consiueieu reSpjen(j€ni> one ot the nocturnal the form of the scales to Scopelince of the great group of Salmo- bear so strong a relation to ni the rest of the ichthyic structure and the general economy of a fish, that he founded upon it his primary divisions of the class, of which he characterized four. The fish of his Cycloid order have scales composed of concentric layers ot horn scales (fig. 28); in others the teeth are more persistent, Introduc- though the earliest, which are the nearest to the centre tion. of the disk, are generally the smallest. There are some bermal Skeleton, Fig. 28. Fig. 29. Fig. 28. Ctenoid scale of Gobius ommatuvus. ... 29. Ctenoid scale of Psettus argenteus, a Clisetodontoid. scaleless groups associated with Ctenoids. Scales of this and the preceding order have most commonly grooves ra¬ diating from the centre of the disk over that part which remains in the cuticular pouch, and crenatures on the basal Fig. 25. Scale of a Labroid. Fig. 30. Scale from the bead of Macrourus Australis. Fig. 31. Ctenoid scale of Lethrinus cyno- cheilus.one of tbe Norfolk Island Sparidas. or bone, without spinous margins, and not covered by enamel. He believed that a close relationship existed between the absence of pungent teeth on the scales, and the want of spinous rays in the fins, and that this order has a considerable corre¬ spondence with the Malacopterygii of former ichthyologists. The Cy- clo-Labridce, however, and many Gobiidce, are exceptions to this correspondence, and others exist. Fig. 26. Most commonly the Cycloid scales cycloid scale of Gadopsis mar- axe imbricated ; occasionally they ^fth are placed side by side, in contact pectorals, it inhabits tbe but not overlapping; sometimes they are more remote ; and in Anguilla, the narrow, oblong cycloid scales are in groups lying at right angles to each other, so as to produce a kind of lattice-work under the cuticle. Some genera of fishes with smooth scale¬ less skins come into this order. The Ctenoid order of fish have horny or unenamelled bony scales, with spinous teeth on the posterior edges of the layers like a comb (figs. 27, 28, 29, and Q1 \ A o +I-10 coaloo irronr Ctenoid scale of Scatophagus multifasciatus, o*-)’ 21S Uie sCcties gxuw one of the Squammipennes or Chcctodontidce their spinules wear off, from the Australian seas. and in some species we observe no more than a single series on the posterior edge of the last formed layer of the Fig. 27. edge corresponding with the number of grooves. In both orders, also, the most common circumscription of the scale is circular or subcircular ; occasionally they are irregular or oblique; and the scales in one part of the fish differ from those in another, in outline, and more frequently in size. In some Labroids the largest scales are on the base ot the caudal fin, but in most of the osseous fishes the largest lie towards the middle of the sides of the body. The Ctenoid scales are mostly imbricated. ICHTHYOLOGY. 217 Introduc¬ tion. Dermal Skeleton. In Ganoid fishes the plates or scales are covered by a Fig. 33. Scales of Macrourus ccelorhynchus. thick coat of enamel, and are sometimes of considerable di¬ mensions ; and in many of the extinct species which compose the bulk of this order the enamelled plate is rhomboidal, with a hook at its anterior angle, which assists in retaining it in its place. The recent species included by Agassiz in this order do not form a natural group. Fishes of the Placoid order have the skin covered with irregular plates of hard bone, varying greatly in shape and size. In the Rays and Monk fish they form large, rough, or spinous tubercles ; and in the Dog¬ fish, fine-grained shagreen. As formed by Agassiz, the Fig. 34. order corresponds with the Scale of Macrourus trachyrhynchus. Cariilaginei or (Jhondropterygii of authors, and includes species with smooth skins. For the arrangement of fossil fish these divisions were well devised, but, as may be ex¬ pected, a system based on the variable characters of a Fig. 36. Scales from different parts of the body of Aleuteres variabilis. portion of the dermal skeleton fails in defining natural groups. Used in conjunction, however, with the other parts of the structure, Agassiz’s discoveries are of great im¬ portance for the purpose of classification. Along the side of an osseous fish, there isalinerunningffom VOL. XII. the head to the caudal fin, or even through the latter, called Introduc¬ tion. Dermal Skeleton. Fig. 37. Ctenoid scales from the lateral line at the base of the caudal fin of Caranx pa- rapistes, a Scomberoid from North Australia. the lateral line. It is nearer the back in some fishes than in Fig. 38. Cycloid scale from the lateral line of Labrus laticlavius, Cyclo-Labroid. an Australian others; very generally it runs at mid-height, sometimes it ceases a long way before the caudal fin; and in Chirus there are several lateral lines, the upper one coasting the back, and the lower one the edge of the belly. This line is muciferous, being connected with a series ris of glands. In theMw^Jt^Z-Cycloid scale from the lateral line of Odax l(JB tll0 mucous ossicles ti genus closely ullied. to Sc&vus* lying like the scales under the cuticle are scarcely visible, and in many scaleless vermiform apodals the line is still less conspicuous; but in these slimy fishes the whole skin is densely studded with glands and their ducts. The scales that cover this line, or lie in immediate contact with it, above and below, are con¬ structed with a tubular arch along their middle, or a simple perforation in the disk, or with a mere notch on the edge for the exit of the mu- coduct (figs. 25, 29, 32, 38, xig.*u. 39, 40, 41, 43, and 44). The a Cycloid scale from the laterallineof scales are sometimes larger °st^itfand than the ordinary ones in the Polynesia- same fish, occasionally they are smaller, and sometimes they Fig. 41. Fig. 41. A cycloid scale from the lateral line of Saurus undosquamis, on the North A ustralian Scopelince. ... 42. Ctenoid scale of Flatycephalus cirrhonasus, one of the Sclerogenidc Botany Bay. ^ are the only ones, the rest of the body being naked. Very 2 E 218 ICHTHYOLOGY. Introduc¬ tion. Dermal Skeleton. frequently they have strange irregular forms (fig. 44), and Fig. 44. of acutely bent dermal bones, and the Dory has two rows Introduc- of plates along the belly. In the Ostracionidce and Syn- tion. gnathidce the fish is wholly or completely encased in scales, bermal so connected as to admit of few motions of the body. And ^keIet°n. in the Gurnards, and many other Sclerogenida, some genera of Siluridce., the great Sudis among the Clupeidce, and Polypterm among the Ganoids, the cranial and hu¬ meral bones of the endo-skeleton present hard, rough, sha- greened surfaces exteriorly, in which the soft epidermis is not perceptible, and the resemblance to the dermal plates of the Sturgeon is close. In many other fishes, also, the cranial bones emit processes from their outer surfaces, which serve as canals for the mucoducts. Fig. 43. Fig. 43. Figured Cycloid scale from the lateral line of Hameroccetes acantho- rhynchus, a Gobioid inhabiting the seas of New Zealand. ... 44. Scale from the lateral line of Trigla pleuracanthica, one of the Australian Sclerogenidce, they are in some cases peculiarly armed. The lateral line may be traced forwards on the head to one or more little bones named supra-temporals, and thence over the cheek along the sub-orbital series of bones to the first and usually largest of the series, named the pre-orbital, as may be well observed in fig. 8, page 207. All these bones are constructed so as to protect the muciferous canals, and in many fishes they are mere osseous pipes. In the Gadidce and in Macrourus, the pre-orbital and following bones of the chain are largely developed and fold down, forming large semi-canals. These bones are strongly armed in some Acanthopteri, particularly the Sclerogenidce, in which the second of the sub-orbitar chain emits a spine or series of spines or tubercles, and is prolonged to articulate with the pre-opercular. The marginal serratures of the pre-orbital are conspicuous in Mugil, and furnish charac¬ ters for other genera of Acanthopteri. The supra- orbitals, though less constant than the sub-orbitals, belong to the same system. The Carp has one above each orbit, and the Lepidosteus three. The turbinals are also considered by Professor Owen to appertain to the der¬ mal system. They are wanting, together with the sub¬ orbitals, in many of the serpentiform apodals; but the tur¬ binals exist, though of very small size, in the Conger. Of the other dermal bones of fishes our notice must be very cursory. The head of the Sturgeon is protected by large dermal plates closely arranged, and the rows continued along the trunk of the fish are, as we have mentioned above, examples of the Placoid scales of Agassiz. The sternum, Fig. 45. Head of Bovichthys variegatus, one of the Uranoscopidce from Sydney to show the branching mucoducts. ’ as it has been called, of the Herring, is formed of a series SECTION IY.—THE MUSCLES AND MUSCULAR MOTIONS OF FISHES. The spinal column, composed of numerous articulations united by cartilages which permit of certain movements, curves with great facility from side to side ; but the vertical motion is much more restricted, chiefly in consequence of the projection of the upper and under spinous processes of the vertebrae. The great organ of movement in all fishes is the tail. The muscles by which it is brought into play extend in lengthened masses on either side of the vertebral column. The body being rendered specifically lighter by the dis¬ tention of the swim-bladder when that exists, is impelled forwards by the rapid flexure of the tail acting laterally upon the water. The head of fishes exercises but slight movement, independent of the rest of the body; but the tympano-mandibular arch, often the maxillary and pre- maxillaries, the hyoid and branchial apparatus, and occa¬ sionally the scapular arch, have more or less motion. The finny terminations of the last named appendage and of the pelvic bones, as well as the vertical fins, are seldom at rest. SECTION Y. THE NERVOUS SYSTEM AND SENSES OF FISHES. The spinal chord, which terminates anteriorly in an en¬ largement named the brain, consists of a dorsal and ventral pair of columns, the former having for its function the re¬ ceiving of impressions made on the peripheral surfaces of the body by external objects, and the latter, that of direct¬ ing the voluntary muscular movements,— they are the nervous centres of animal life. Each consists of an inti¬ mate aggregation of nervine matter named ganglions. From the sensorial and motor columns on each side of the chord, nervous filaments, more or less in number, proceed, and being invested by a common membrane, pass out be¬ tween the vertebrae to all parts of the body; one on each side between every pair of vertebrae, the number of verte¬ brae being in fact regulated primarily by the number of pairs of spinal nerves. It would be correct to say that the nerves of motion arise from the motor column, and that the nerves of sensation terminate in the sensorial one. For, though the trunks of the nerves lie in a common envelope, the distribution of the former may be compared to a tree having one or more roots, with a trunk giving origin to numerous branches, and innumerable twigs ; while the sen¬ sorial nerves are like streams formed by minute rills, uniting in a river that terminates by one or by several mouths. To serve the involuntary muscles, as the heart and arterial system, and also to supply the viscera that perform the functions of digestion, assimilation, secretion, or to preside over organic life there is a separate system of ganglia and network of nerves that has been named the sympathetic. Under this general description the nervous systems of all the vertebrals may be comprehended; but in the higher classes, the development is much more full than in fishes, ICHTHYOLOGY. Introduc¬ tion. Nervous System. and among fishes the Lancelet offers the simplest nervous system of the whole series of vertebrated animals. The spinal chord, or the nervous columns, for which, in¬ dependent of its protecting investments, the term myelon / has been well devised by Professor Owen, is extremely short in those fishes whose lumpish shape originates in the abreviation and coalescence of the posterior vertebrae. In Orthagoriscus and Lampris, the whole myelon appears to be a minute ganglionic process of the brain. In Tetrodon and Diodon it is also very short, or about a twentieth of the length of the fish ; but the rest of the neural canal is in them occupied by a bundle of caudal nerves, usually named, from their resemblance to the tail of a horse, cauda equina. Lophius has a myelon which reaches the twelfth vertebra; but its pointed end is concealed by a long cauda equina. In most fishes there is no cauda equina, and the myelon runs to the end of the neural canal. In fishes the brain consists of a few ganglionic masses, which vary in number in different groups of species, and, as has been mentioned, are wholly wanting in the lowest form of the class. It is proportionally larger in the young fish, and Professor Owen states that, on an average, its weight is only a three-thousandth part of that of the whole fish. Cams estimated the brain of the Burbot {Lota) as forming the seven hundred and twentieth part of the en¬ tire weight; and that of the Pike has been found to be the thirteen hundred and fifth part. We mean to mention only the more constant or impor¬ tant encephalic masses, and even these in a very cursory way. The myelon, on expanding into the brain, assumes the name of “ epencephalon,” which is protected by the occipital neural arch of the skull. In proceeding from the spinal column onwards towards the nose, the first rounded masses that we observe in the epencephalon are not constantly present in fishes, nor do they exist in any other class of vertebrals. They are called “ vagal lobes,” and are largely developed in the Cyprinidce, and enormously in the Torpedo, Narcine, and other electric Rays. In these they supply the large electric nerves. They are also large in Gymnotus, which, however, does not receive its electric nerves from these organs. The medulla oblongata, and cerebellum, are more constant parts of the occipital division of the brain. Fishes that possess much muscular energy, and take their prey by the velocity of their movements, have the largest cerebellum; and the other extreme of its size is found in the feeble Myxine or Glutinous Hag which passes its parasitic existence buried in the flesh of other fishes. It is also a mere fold in Polyp- terus, and is very small in the sedentary Discoboli, whose ventral fins are employed as suckers to attach the fish to the rocks. A mong osseous fishes the cerebellum attains the largest size in the warmer-blooded, impetuous Tunny ; and in the cartilaginous Sharks it is still more largely developed. The next division of the brain, the “ mesencephalon,” pro¬ tected by the neural arch of the parietal vertebra, is usually larger than the other divisions in osseous fishes. To it be¬ long the two optic lobes, whose function is denoted by their name. They are hollow in most fishes, and are often larger than the cerebellum, as in Polypterus and Lepido- siren, of equal size with that organ in Eels, and smaller in the Sharks and in Amblyopsis. Their existence at all in this fish, which is blind, and in the Myxine, which is equally destitute of sight, shows that they have some other function than merely communicating with the optic nerves. The “ prosencephalon,” inclosed in the neural arch of the frontal vertebra, corresponds to the cerebral hemispheres of the higher vertebrals. It is smallest in the Myxines, equal to the cerebellum in the Perch, and exceeds in size that of the Stickleback, Gurnard, Lepidosteus, Lucioperca, Am- blyopsis, and Raia. In Polypterus and Lepidosiren it sur¬ passes all the rest of the brain. 219 Nervous System The fourth and last division of the brain, protected by Introduc the nasal neural arch, consists of two lobes, named “ rhinen- tion- cephala” or “ olfactory lobes,” as they send forwards the nerves that supply the organ of smell. Organ of Vision.—The position, direction, and dimen¬ sions of the eyes of fishes vary greatly. In some they have an upward aspect, and are often very close upon each other; in others they are lateral, and so wide apart as to be even directed slightly downwards. But of all anomalies, one of the most extraordinary which their position presents, is that of the Pleuronectes (such as Turbot, Flounders, Soles, &c.), in which the two eyes are placed, as it were, the one above the other, and both upon the same side of the head. In certain species of the Eels and Sifuri, they are so small as to be scarcely visible ; while in other groups, such as Pria- canthus, Pomatomus, and Orthagoriscus, they surpass in proportional diameter whatever is known of the same organs in the higher classes. Some ichthyologists have remarked that fishes which habitually descend to great depths in the ocean have large eyes; and in the internal parasites and in fishes which live in subterranean waters, we have examples of the most rudimentary form of the organ of vision. In the Glutinous Hag, and in the Amblyopsis spelceus, the eye is merely a minute black fold of skin on which a cerebral nerve terminates. In Apterichthys ccecus, the eye-ball, still rudi¬ mentary, is covered by the skin. It may be said in general that the eye of fishes is large, and that its pupil especially is broad and open ; a character probably connected with the necessity of collecting whatever devious rays of light may penetrate the obscure depth of waters. Fishes have no true eyelids. The skin always passes over the eye, to which it is slightly adherent; and it is for the most part sufficiently transparent for the passage of the solar rays. In some species, such as Eels, it passes over without the slightest fold or duplication. In others, as the well-known Mackerel and Herring, it forms an adipose fold both before and behind ; but these folds are fixed, and being unprovided with muscles, have no mobility. Sharks have one, some¬ what more moveable, on the inferior margin of the orbit. The globe of the eye itself is very slightly moveable, although, like that of man, it is furnished with six muscles. Perhaps the most singular eye presented by the class of fishes is that of Anableps, which has two corneae, separated by an opaque line, and two pupils pierced in the same iris, so that one might deem it double ; but there is only one retina, and a single vitreous and crystalline humour. Fig. 4G. Uranoscopus macropyc/us, an Acantbopterygian fish in which the onlv spi¬ nous ray is one in front of the ventral fin. The points of the pubic bones are also spinous, and the undeveloped interspinous bones of the first dorsal lie beneath the skin. The eye-ball is retractile to beneath the edee of the orbit. In Uranoscopus macropygus and others of that genus, the eyes can be elevated and depressed at the will of the fish, on a cylindrical stem, above or below the plane of the flat dorsal aspect of the head on which it is situated; and in the ferocious Zygcena, the eyes are stilted out from the sides of the head on cartilaginous expansions of the skull. Fishes, in the range of their vision and acuteness of sight, are very far inferior to birds, and inferior generally to reptiles and beasts, yet, at the same time, it is evident that they perceive their prey from a considerable distance; and the angler, who knows either how rapidly they seize, or how Hi 220 ICHTHY OLOGY. Introduc- cautiously they avoid his lure, and with wdiat discrimination tioiu they sometimes prefer one colour or kind of artificial tty to The Senses. another, must be impressed with the belief that the vision, at least of certain species, is by no means devoid of clearness and precision. v r '-,\ Y’' JS^SUt ‘Mm Fig. 47. Shows the large eyes of Sebastes percoides, one of the Sclerogaaidm or Trigli- dce, a family whose home is at the bottom of the sea, and have very com¬ monly the lower rays of the pectoral fins detached and organized as feelers We shall not repeat here the notices that we have already had occasion to take of the organ of hearing. In Sharks, a canal extends from the interior organ of hearing to the hinder part of the head, where it is closed by the skin, and in the rays there is a very minute external orifice to the canal, closely approximated on the dorsal aspect of the head to its fellow. In osseous fishes there is no such me¬ chanism, and the sonorous vibrations are conveyed to the labyrinth through the solid parts; but in the Carp and certain Siluroids, the air-bladder would appear to be ac¬ cessory to the acoustic organ, as it is connected with it by a chain of ossicles. The general structure of the organ of hearing in fishes is doubtless specially adapted for the sensation of the sonorous undulations of the element in which they live. A few lines may now be devoted to the consideration of the sense of smell. The nostrils of fishes are not so placed as to be traversed by the respiratory me¬ dium in its course to the organs of respi¬ ration. They con¬ sist merely of two openings, situate on the muzzle, and lined by the pitu¬ itary membrane, which is raised in extremely regular folds. Their shape is sometimes oblong, sometimes round or oval. They are placed either at the end of the muzzle or on its sides; some¬ times on its su¬ perior face? and even occasionally, as in Skates (fig. 48), and Sharks, on its under surface near the angle of the mouth. In the Lamprey they are approximate on the top of the head, and open by one common orifice (fig. 49). In the great ma- distance. These are what are called double nostrils, an Introduo inaccurate term, in as far as each pair of holes leads only tion. to a single cavity. The margins of the anterior orifice are The Senses, often tubular, as in the Eel, and sometimes a single side of the tubular margin is prolonged into a tentacular appendage, as in several Siluri. In the genus Lophius the nostrils are borne upon a little pedicle, so as somewhat to resemble mushrooms. Various other modifications are observable in different genera, although not necessary to be here narrated. It is certain that fishes possess the faculty of perceiving odours; that various scents attract or repel them; and there is no reason to doubt that the seat of that perception lies in the nostrils. It may be reasonably conjectured that its strength depends mainly on the degree of development produced by the number and extent of the interior folds of the pituitary membrane. The essential character of the organ of smell in fishes is that the pituitary sac has one or more external openings not communicating with the mouth or fauces except in the Dermopteri, and in these the naso-palatine canal is not traversed by the water in its course to the gills. In some Synbranchidce, the posterior nasal aperture is situate on the white parts, within the edge of the lip, in this respect agree¬ ing with the Lepidosiren. Long debates on the conflicting claims of the latter to be ranked as a fish or a reptile, have turned on the position of the posterior nostril. Tetrodon naritus is an exception to the general rule of double nos¬ trils, in having merely a single wide opening, coextensive with the dimensions of the pituitary sac, but bordered by membrane. In other Tetrodons the sac is closed by a thin membrane, in which there are two small openings close to each other. The Chromidce also, and the Ctenoid Labridce, have but one opening to each sac; and in some few fishes there is a barbel merely, without an aperture, in place of a nostril. In regard to the sense of taste in fishes, it is evident that as, with few exceptions, they swallow their food rapidly and Fig. 48. Nostrils of Raid. Lemprieri, an Australian Skate. Fig. 50. Month of Plotosus megastomus, one of the Siluridce. This fish feeds at the bottom and the barbels developed round the mouth are organs of touch. Teeth are seated on the inner lips and move with them. Fig. 49. Head of Petromyzon mordant, showing the single nostril tube and seven branchial orifices. jority of fishes each nostril' opens by two orifices, the one posterior to the other, and in some cases at a considerable without mastication, their perception of that faculty must be in noways acute. The same may be inferred from the fact of their tongue being almost immoveable, often entirely osseous, or beset with teeth or dental plates, and from its receiving very slender nerves, and these but few in number. Even those species of which the jaws are so armed as to enable them to cut and bruise their aliment, cannot long retain the latter in their mouths, on account of the position and the play of the respiratory organs. No salivary glands discharge their moisture on the organs of taste. The tongue itself is not seldom entirely wanting; and even when it ICHTHYOLOGY. 221 Introduc- exists in its most distinct and apparently fleshy state, it tion. consists merely of a ligamentous or cellular substance, Tlie Senses. appiiecj on the surface of the lingual bone. It is never V"-' furnished with muscles capable of producing any movement of extension or retraction, as in quadrupeds. Fishes cannot be said to be more highly favoured in re¬ spect to the organs of touch than those of taste. The faculty is greatly deadened over the general surface by the coating of scales, and in the particular members by the inflexibility of the rays. It is chiefly confined to the lips, and even these parts in many species are themselves as hard and in¬ sensible as bone. Certain soft and delicate appendages called barbels, possessed by many species, such as the Cod and Loach, are supposed to enjoy a more delicate percep¬ tion of the sense of touch; and among the Sderogenidce there are many species that have one or more rays of the pectoral detached from the membrane, so as to become truly delicate, flexible fingers, not for prehension but for touch. The common Gurnard has been seen in a clear sea swimming along near a sandy bottom, and exploring it with these special organs of touch. It is by means of the dermis that that peculiar matter, so remarkable for its silvery me¬ tallic lustre, and which bestows so much of brilliancy upon the class, is secreted beneath the scales. It is composed of of small polished plates resembling burnished silver, and capable of being removed by washing, either from the skin itself, or from the inferior surface of the scales. It is this substance that is used in the formation of false pearls. It is also secreted by many species in the thickness of the peritoneum, and in the envelopes supplied by that part to particular viscera, especially the swimming bladder. It thus appears that the external senses of fishes convey to them few lively or distinct impressions; and by what¬ ever scenes in nature they are surrounded, their perceptions are probably indistinct and dull. Their sexual emotions, cold as their blood, indicate only individual wants. Few species pair, or enjoy any connubial gratification, for the males seek the eggs rather than the females which deposit them, and neither sex ever recognises its offspring. At least the exceptions to these general laws are extremely few, and when they occur they are of the lowest animal description. A pair of Congers are so dead to external im¬ pressions at the time of sexual congress, and so automati¬ cally, as it were, engaged, that they have been taken by the hand together out of the water. Sharks and Pectoral fins and claspers, or introraittent organs of the male Hemiscyllium trispeculare. Rays have special organs that make some approach to those of the two higher classes of vertebrals. We have no means of knowing much of the loves of a Dog-fish or Skate, but the prevailing economy of fishes may be said in all these re¬ spects to be exactly the reverse of that of birds. These gay creatures of the sky have the power of surveying dis- Introduc- tinctly at a glance an immeasurable extent of horizon; ^on- their acute perception of hearing appreciates all sounds, TheSense^ and every intonation ; and their glad voices are exquisitely ^ skilled in their production. Though their bills be hard, and their bodies covered by down and feathers, they are by no means deficient in the sense of touch. rI hey enjoy all the delights of conjugal and parental affection, and perform their incumbent duties with devotedness and courage ; they cherish and defend their offspring, and will sometimes die in their defence ; and of all the wonderful labours of instinc¬ tive art, none is so beautiful as the formation of their mossy dwellings. With what deep and continuous affection does the female brood over her cherished treasures! how un¬ wearied is the gallant male in his tender assiduities, and in the rich outpouring of that varied song by which he seeks to soothe her sedentary task! The same principle of at¬ tachment and discrimination is even made available in a state of domestication by the skill of all-engrossing man. A bird acquires a knowledge of its master, and submits to and obeys that master’s will; and the proud falcon, which in its natural state “ Doth dally with the wind, and scorn the sun,” will wheel in airy circles over a well-trained dog, or stoop its boldest flight at some familiar urchin’s call. Other species will even imitate man’s noblest faculty, the power of speech,—and it is thus with somewhat doubtful feelings that we deny to them the gift of reason. But the silent dweller in the deep knows few attachments, expresses no language, cherishes no affections. Construct¬ ing no dwelling, he merely shelters himself from danger among the cavernous rocks of the ocean, or beneath the murky shade of the overhanging banks of rivers ; and the cravings of hunger seem alone to exercise a frequent or influential action over his monotonous movements. We must not, however, suppose that the life of fishes is not one of enjoyment, for we know that the great Creator “ careth for all his creaturesand it ought perhaps rather to be said that we cannot appreciate the nature of their feelings, than that they are in any way fore-doomed to a negation of pleasure. Assuredly,^however, the hand of nature has been most prodigal in bestowing on their external aspect every variety of adornment. Their special forms are infinite, their proportions often most elegant, their colours lively and diver¬ sified, and nothing seems wanting in them to excite the admiration of mankind. Indeed it almost appears as if this prodigality of beauty was intended solely for such an end. The brightness of metallic splendour, the sparkling bril¬ liancy of precious gems, the milder effulgence of the hues of flowers, all combine to signalize fishes as among the most beautiful objects of creation. When newly withdrawn from their native element, or still gliding submerged in its liquid coolness, their colours, fixed or iridescent, are seen mingling in streaks or bands, or broader flashes, always elegant and symmetrical; sometimes richly contrasted, sometimes gra¬ dually softened into each other; and in all cases harmoniz¬ ing with a chaste fulness of effect, which Titian or Rubens might envy, but could never equal. For what reason, then, it has been asked, has all this adornment been so lavishly bestowed on creatures which can scarcely perceive each other amid the dim and perpetual twilight of the deep ? Shakspeare has already said that there are “ more things in heaven and earth than are dreamt of in our philosophy and we fear it is no answer to the foregoing question to add, that the same observation applies with even greater truth to the “ waters beneath the earth.” SECTION VI.—THE NUTRITION, MANDUCATION, AND DEGLU¬ TITION OF FISHES. The nutritive functions of fishes follow the same order 222 ICHTHYOLOGY. Introduc- of progression as those of the other vertebrated classes; tion. they seize, and some divide, their food with their teeth; Digestive digest it in the stomach, from whence it passes into the ^ System. ^ ;ntestinal cana]; where it receives a supply of bile from the liver, and frequently a liquid similar to that of the pancreas ; the nutritive juices, absorbed by vessels analogous to lacteals, and probably taken up in part also directly by the veins, are mingled with the venous blood which is flowing towards the heart, from whence it is pushed to the branchiae, in which, coming into contact with the water, it is converted into arterial blood, and then proceeds to the nourishment of the whole body. As in other animals, also, certain pro- perties are carried off from the blood by transpiration, the secreting power of the kidneys, &c. Fishes in general are extremely voracious, and the rule of “eat or be eaten” applies to them with unusual force. They are almost constantly engaged in the pursuit and capture of their prey; their degree of power in these re¬ spects depending of course on the dimensions of the mouth and throat, and the strength of the teeth and jaws. If the teeth are sharp and hooked, they are capable of securing the slenderest and most agile animals; if they are broad and strong, they are able to bruise the hardest aliment; if they are feeble or entirely wanting, they are only service¬ able in procuring some inert or unresisting prey. Fishes indeed show but little choice in the selection of their food, and their digestive powers are so strong and rapid as to suffice to dissolve very speedily all kinds of animal sub¬ stances. They greedily swallow other fishes, notwithstand¬ ing the sharp spines or bony ridges with which they may be armed; they attack and devour crabs and shell-fish, gulping them entire if they cannot otherwise attain their object; they do not object occasionally to swallow the young even of their own species, and the more powerful kinds carry their warfare into other kingdoms of nature, and re¬ vel on rats, reptiles, and young ducklings, to say nothing of the ferocious Shark, which not seldom makes a meal even of the lord of the creation. The species which live chiefly on vegetable substances are few in number. The growth of fishes depends greatly on the nature and supply of food, and different individuals of the same species exhibit a great disparity in their respective dimensions. They grow less rapidly in small ponds or shallow streams, than in large lakes and deep rivers.1 The growth itself seems to continue for a great length of time, and we can scarcely set bounds to, certainly we know not with preci¬ sion, the utmost range of the specific size of fishes. Even among species in no way remarkable for their dimensions, we ever and anon meet with ancient individuals, favourably situated, which vastly exceed the ordinary weight and mea¬ surement of their kind. The teeth of fishes are more variable in form, structure, number, and position, than those of any other class of animals. They are depressed prisms of three, four, five, or six sides in Myletes, Mylioha- tes or Scams. More generally they are round and tapering, varying in length and thick- ness from the “ short obtuse cone,” to the “ long conical,” “ subulate,” “ acicular forms,” even to such fineness as to be named “ ciliiform.” Their points may be curved, reflexed, and bent at right angles, and their bases may be fixed or Introduc. moveable. In some Gohiidoe their forms and free motion tion. have caused them to be compared to the keys of a piano, ^'g^tive When acicular or ciliiform teeth are arranged so closely as to v‘ em- resemble the pile of velvet, they are said to be “ villiform” {en velours') ; and when coarser and straight, or with their points bent back, they are “ card-like,” or “ cardiform,” or they may be rasp-like or carduliform {en rape ou en cardes). The Chcetodontidce are named from their seti- Fig. 52. Petroscirtes BanTcieri. Fig. 53. Head ot Histiopterus recurvirostris, one of the Squamipennes or Chcetodon¬ tidce. The teeth, as in the true Chisetodons, are closely set, but they are stouter than the “villiform” teeth, and even than those usually named “ setiform,” having a resemblance to the cylindrical blunt fibres of whale¬ bone in a scrubbing-brush, hence they may be termed coarsely “ brush¬ like” (en brasses). They are somewhat thicker than the strong hairs of an elephant. form teeth. In the Sphyrcena we have examples of teeth exactly resembling the blade of a surgeon’s lancet {vide fig. 19), and in Sharks ^ the teeth have a variety 'A of forms, from the long triaedral dagger or spike- nail of Oxyrhina and Odontaspis, to the ser¬ rated or lobed cutting teeth of Galeocerdo, Carcharodon, Cacharias, and other genera, set in a row so as to make a most powerful instrument, by which one of these crea¬ tures is able to divide a man’s body into two at a Fig_ 54 single bite, down to the Orifices of the mouth and nostrils of-Hcwii- nnvfwnpnt-likp nr fpsspl- scylliumtrispeculare. The teeth are seated pavement UKe Ol tesstl in the skin covering the cartilages of the lated teeth (en paves) of jaws, and, as the skin grows outwards . ^ r. \ ‘ A (peripheral) like the nails of a man s the Dog-fish, or t^es- fingers, the teeth as worn drop off, or de- ncprl fnr prneh- squamate, and are succeeded by others tracion, used, toi crusn from within, gradually rolling over the insr. The Carp has a cartilages. Fig. ll gives a full-length B . * , , i view of this fish. crushing apparatus at the entrance of the gullet. In Myliobates, Aetohates, Rhin- optera, the pavement formed by the broad teeth is of the most regular and beautiful kind. In Scarus and Hopleg- nathus or Scarodon, the teeth are so united to the pre- maxillaries and mandible as to form but a single tooth in paph iaw. while in Calliodon. the union of the teeth 1 The writer of this treatise kept a minnow little more than half an inch long in a glass tumbler for a period of two years, during which time there was no perceptible increase in its dimensions. Had it continued in its native stream, subjected to the fattening influence of a continuous flow of water, and a consequent increase in the quantity and variety of its natural food, its cubic dimensions would probably have been twenty times greater; yet it must have attained, prior to the lapse of a couple of years, to the usual period of the adult state. (J. w.) ICHTHYOLOGY. 223 tion Digestive System. [llntroduc- with the bone is less complete, and their edges rise above the general surface. In Diodon, we have the same kind of single tooth in each jaw, or rather confluence of teeth and jaw. In Tetrodon, the dentiferous jaws are divided by a mesial suture so as to present two com¬ pound teeth above and as many below. In the Plagiostomes, the teeth are limited to the maxiU lari/ and mandibular bones, while in the genus Ci/prinus teeth are wanting in the jaws, but, as mentioned above, these fish have grinding teeth jaWs of on the pharyngeals and basi- occipital. In the Catastomi of the Cyprinoid family, the pharyngeal teeth are arranged on a crescentic bone like the teeth of a curved comb, the points being thickened for grinding. In Scarus, besides the solidly aggregated jaw Fig. 55, Hoplegnathus (Soarodon Schlegel). The upper jaw is consti¬ tuted by the pre-maxillaries coales- cent into a single bone, and having the teeth so intimately incorporated with their substance as to make a solid, smooth, gorget-shaped bone; the forms of the teeth, however, faintly showing. The same is the case with the maxillary,the symphy- sial line being obliterated as com¬ pletely as in the human under jaw. Jaws of Enchelynassa Bleekeri, one of the Murcenidce. In this genus, teeth stand round the edge of the nasal bone and down its mesial line ; two small ones exist on the vomer; two rows on the palatine bones and mandible. The hinder nostril is funnel-shaped. Fig. 58. Teeth of Calliodon chlorolepis, a Scaroid fish from Hong Kong. In this genus the teeth are less intimately united to the jaw-bones than In Scarus and Eoplegnathus. In the upper jaw the teeth consist of narrow chisel-shaped denticles, so grouped as to indicate four teeth with curved crenated edges on each pre maxillary and limb of the dentary piece of the maxillary. In the latter the four teeth stand out more distinctly, the one next the medial line being so intimately coalescent with its fellow as to form merely one tooth of the same shape as the others, and seated in front of the sym¬ physis. So considered, it is a pairless median tooth, followed on each side towards the corner of the mouth by three others. There are also two small subulate canines or buck-teeth on each pre-maxillary. The fish is the “Scaly King-fisher” of the Chinese, who give it this name because it has bright celandine-green, orange, and yellow colours. teeth above mentioned, there are also pharyngeal grinders. In Crenidens, thin tricuspid teeth placed in many close rows on the jaws, serve to cut the tender fuci on which these fishes feed. In passing through the whole series of fishes, we find teeth on the nasal bone, as in Murcena, where they stand in a row round the edge of the bone, and in one down the longitudinal mesial line ; on the pre-maxillary, the maxillary, the palatines, Fig. 57. the vomer, the hvoid-bones, the branchial Tee.th °f Tetrodon arches, and especially on their processes, Ostracionidce fam- named “rakers.” Teeth occur on the slmiiaftot^ose o*f maxillary only when it enters into the natkus abudt ttufme" composition of the orifice of the mouth, as smi symphysis of in the Clupeidce and Sahnonidce. In fngnomcoaiescent^ Pristis, of the Ray tribe, the flat snout, ^^'asIlUgene! greatly prolonged, and well ossified, is set ric name denotes, on each side by a series of very strong nail-shaped teeth, whence its name of Saw-fish among sailors, though it is in reality a weapon that wounds by repeated blows, not by cutting longitudinally like a saw. This snout forms a dangerous sword in the hands of the Polynesians who use it Jaws of Brachysomophis horridus, one of the Ophisuridce, which have one row of teeth round the margin of the nasal, one row down the mesial line of that bone, and one on the vomer; a row on the mandible, and two rows on the palatines. well as strong pharyngeals. Commonly the teeth do not cross the symphysis of the jaw, there being in most cases a line of division between the pre-maxillaries or at the union of the limbs of the mandible. Instances to the contrary have already been mentioned in Scarus, Hoplegnathus, and Diodon. In Notidanus, Scymnus, and Myliobates, among the Plagiostomi, we have also examples of this departure from the dental type of the higher animals. 224 ICHTHYOLOGY. In the majority of osseous fishes, besides the lips, which, having no peculiar Introduc¬ tion. Digestive muscles, can exert System^ })ut little strength in retaining the ali¬ ments, there is gene¬ rally in the inside of each jaw, behind the anterior teeth, a kind of membranous fold or valve, formed by a replication of the in¬ terior skin, and di¬ rected backwards, of which the effect is to hinder the alimentary substances, and espe¬ cially the water gulp¬ ed during respiration, from escaping again by the mouth. This structure does not, as formerly supposed, constitute a character Fig. 61. Labial teeth of Petromyzon mordax. Fig. 62. Pharyngeal teeth of Petromyzon mordax. restricted to the genus Zeus, but exists in an infinity of fishes. The food seized by the teeth of the jaws, and detained by the valve just mentioned, is carried still farther back by the teeth of the palate and tongue when these exist, and is at the same time prevented by the rakers of the branchial arches from penetrating between the intervals of the branchiae, where it might injure the delicate organs ot respiration. The movements of the jaws and tongue can thus send the food only in the direction of the pharynx, where it undergoes additional action on the part of the teeth of the pharyngeal bones, which triturate or carry it backwards into the oesophagus. The last-named part is clothed by a layer of strong, close-set, muscular fibres, sometimes form¬ ing various bundles, the contractions of which push the alimentary matter into the stomach, thus completing the act of deglutition.1 SECTION VII.—THE CIRCULATION OF FISHES. Fishes, in common with warm-blooded animals, are pro¬ vided with a complete circulation for the body, and with another equally complete for the organs of respiration, and with a particular abdominal circulation terminating at the liver by means of the vena portce ; but their peculiar cha¬ racter consists in this, that the branchial circulation alone is provided at its base with a muscular apparatus or heart, corresponding to the right auricle and ventricle of the higher classes, while nothing of the kind exists at the base of the circulating system of the body; in other words, the left auricle and ventricle are entirely wanting—the bran¬ chial veins changing into arteries without any muscular envelope. The muscular apparatus of their circulation is composed of the auricle, the ventricle, and the bulb of the pulmonary artery, and the auricle itself is preceded by a large sinus, in which all the veins of the body terminate; thus there are in a single series four cavities separated by constric¬ tions, into which the blood must flow in its progress from the body to the branchiae. Their size is small in propor¬ tion to the dimensions of the body, and does not in- Introduce crease in the same ratio with the growth of the indi- tion. vidual. Three of these receptacles, the auricle, the heart, ^ ocular and the bulb, are lodged in a pericardium, which is itself v' ys etn- placed beneath the pharyngeal bones, between the in- ferior parts of the branchial arches, and for the most part protected externally by the scapular arch. Except in the Plagiostomes, the great venous sinus is not placed in the pericardium, but between the posterior partition of that cavity and the membrane which represents the dia¬ phragm, and which is merely the anterior portion of the peritoneum strengthened by aponeurotic fibres. 1 his sinus is extended transversely, and receives by several different trunks the veins of the liver, of the generative organs, of the kidneys, of the fins, branchiae, and throat; and finally those of the head, which themselves partly pass by a sinus at the back of the cranium. The first-mentioned sinus sends the whole of this blood by a single orifice of its an¬ terior convexity into the auricle, which receives it through the opening of its anterior portion. I wo thin membranous valvules protect this communication, and are turned towards the auricle. The latter organ is placed in the pericardium, in front of the great sinus, and above the ventricle, that is, on its dorsal aspect. The ventricle presents very various and often remarkable configurations. In osseous fishes it is usually of a tetrahedral form,—in the cartilaginous kinds more frequently rounded and depressed. It is situate beneath the auricle, the cavity being so turned as to be almost vertical next that organ, and horizontal towards the bulb. Its coats are extremely robust, and furnished internally with power¬ ful fleshy columns, its substance being composed of two different layers. But it is in the bulb of the branchial ar¬ tery that we find the most vigorous fibres, usually disposed in a circular form. The prolongation of this bulb issues from the pericardium, and becomes the branchial artery, advancing forward beneath the single chain of small bones which unites the arches of the branchiae. The branchial artery soon divides, and in such a manner as to send a branch to each branchia. These branches pass along a hollow groove on the convexity of each branchial arch, and more external than the vein which follows the same track, but in an opposite direction. To the arch are at¬ tached a great number of leaflets, parallel to each other, usually terminated in a forked point, and sometimes deeply divided. The principal branch which passes along the groove of the arch gives a smaller branch to each of the leaflets; and this branch, after being twice bifurcated, furnishes an infinity of lesser branchlets, which meander over the surface of each leaflet, till they finally termi¬ nate in extremely minute veins. These little vessels meet on each side in a branchial vein, which proceeds along the internal margin of the lateral lobe of the leaflet, and the two veins open into the trunk of the great vein of the branchia. On passing out of the dorsal side of the branchiae, the branchial veins assume the structure and functions of arte¬ ries ; even before their arrival at this point, the anterior have already sent several branches to different portions of the head; and it is necessary to remark, that the heart and sevenil parts situate in the chest receive their blood from a branchial vein, by means of an offset issuing from near its source, and consequently anterior to its exit from the branchiae. Nevertheless, it is only by the re-union of the 1 The various notices (as already intimated) of the internal structure of fishes contained in the article Comparative Anatomy o this work (vol. iii.) absolve us from the necessity of presenting any details regardingthe form and constitution of the intestina cana , and of certain other important interior organs of the class. The forms of the stomach, whether “ siphonal” or “ ccecal,” the pancreatic apparatus passing from slender coecal appendages to the intestinal canal, which secrete a proper fluid but do not admit the food, gra- . dually increasing in complexity to the pancreatic conglomerate gland of the sturgeon, are parts of structure which the ichthyologis is required always to pay attention to ; and also to the extension of the inner coats of the intestine by valvular folds, producing a more extensive secreting surface, and delaying the passage of the food. The two forms of spiral valves in the lower gut of sharks, and in some of the osseous apodals, require special notice. ICHTHYOLOGY. 225 Introduc- trunks proceeding from the four branchiae that the great tion. artery is formed which carries the blood to the viscera and Vascular a]j t]ie parts of the trunk, and which is by consequence System. ^ representative of the aorta of the Mammalia,—but of an aorta which possesses neither auricle nor ventricle at its base. Thus, according to Cuvier’s views, the left cavi¬ ties of the heart of quadrupeds do not exist in fishes, but are replaced by a simple vascular apparatus, situate above the branchiae, in like manner as the right cavities are placed beneath them. SECTION VIII.—THE RESPIRATION OF FISHES. It is by an almost infinite subdivision of the vessels over the surface of the branchiae or gills, that the blood of fishes becomes subjected to the influence of the circum¬ ambient water, which is made to flow incessantly between the branchiae by the movement of the jaws, and of the oper¬ cular and hyoidean apparatus. This mode of respiration is as necessary to fishes as the direct respiration of air is to other animals. If the air is expelled by ebullition from the water, fishes cannot live; and many species are obliged to rise frequently to the surface for the purpose of breathing atmospheric air. It is easy to suffocate various kinds, by keeping them beneath the surface, inclosed in a gauze net. The absorption of oxygen, however, is comparatively small among these aquatics, for it has been calculated that a man consumes fifty thousand times more than is required by a Tench. When fishes are deprived of water, they perish not so much for want of oxygen, as because their branchiae be¬ come dry, and unable to perform their functions duly. Hence the species of which the branchial orifice is small, as the Eel, or those which possess receptacles for moisture, like Anabas and Ophicephalus, long survive exposure; while such as have their gills greatly cleft and open, as the Herring, ex¬ pire almost instantly when withdrawn from their moist abode. Some fishes, as Amphipnous cuchia, and Sacco- branchus singio, have a pulmoniform sac for supplying air to the gills. SECTION IX.—THE AIR-BLADDER OF FISHES. One of the most remarkable and characteristic organs of fishes is the air or swim-bladder. In many genera it has no opening or external communication, and in these the air which it contains must be the result of secretion. It is composed of an extremely fine internal tunic, of another of a thicker texture and peculiar fibrous structure, remarkable for producing the finest kind of isinglass, and is inclosed within the general coating with which the peritoneum in¬ vests the other viscera. It is sometimes simple, as in Perch, sometimes furnished with more or less numerous append¬ ages, as in some of the Haddock tribe, or branched, as in certain Scicence. Occasionally we find it divided, as it were, into two or more parts, by a constriction, as in the genus Cyprinus, many of the Siluridce, and others. It is chiefly among the abdominal fishes that we find it com¬ municating by a tube with the intestinal canal, and either directly with the oesophagus, as in Cyprinus, or with the base of the stomach, as in the Herring. That of the Sturgeon opens into the former portion by means of a large orifice. Professor Owen states generally that the contents of the air-bladder consist in most fresh-water fishes of nitrogen, with a very small quantity of oxygen and a trace of carbonic acid; but that in the air-bladder of sea- fishes living at great depths, oxygen predominates. Biot found as much as 87 per cent, of oxygen in the air-bladder of deep-sea Mediterranean fishes. Dr Davy1 in the air- bladder of fresh-run Salmon found a trace of carbonic acid, and 10 per cent, of oxygen, the remainder of the air being nitrogen. Humboldt found 4 per cent, oxygen, and 96 per cent, nitrogen, in the air-bladder of Gymnotus. That the air-bladder is homologous with the lungs of the higher animals, is the opinion of the best physiologist of the pre¬ sent day. These in their embryo state have gills, the lungs being developed when needed. In fishes the gills are per¬ sistent, while the air-bladder is simple and embryonic, having chiefly a mechanical function to perform. In the Salmandroid Ganoidei, however, various Siluroids, and Protopteri, the air-bladder shows some pulmoniform com¬ plications. The Lepidosiren of the Gambia remains buried in the mud during the dry season, and its respiration is per¬ formed by pulmonary air-bladders, which have short, wide tracheae, kept open by cartilaginous orifices; and all the oxygenation of the blood required during the torpid con¬ dition of the fish is effected in the blood-vessels ramified over the air-bladders. The more obvious use of this organ seems to be to main¬ tain the fish in equilibrium, or to lighten or increase its re¬ lative weight, so as to cause an ascension or a sinking, in proportion as the bladder is compressed or expanded. This is probably effected by the contraction or dilatation of the ribs. At all events it is certain, that when the air-bladder bursts, the fish remains at the bottom, usually turning up its belly, and exhibiting other irregularities in its locomo¬ tion. Another curious effect is observable in regard to fishes which have been suddenly brought from a great depth by means of a long fishing line, and which having no time either to compress or partially empty the organ in question, the air which it contains being no longer pressed by the heavy weight of water, either expands so as to burst the bladder, or by its dilation forces the stomach and oeso¬ phagus into the fish’s mouth. When the air-bladder is pierced artificially, the fish almost immediately turns upon its back, and sinks to the bottom. Though of the highest importance in the structure of such species as possess it (and these are by far the greater number), yet the air-bladder is not indispensable in the general economy of the class of fishes.2 In some fishes it is no bigger than a pea; in several genera (e.g., Pleuronectes) it is entirely wanting, and the species in such cases gene¬ rally remain at the bottom, and, swimming obliquely on one side, propel themselves forward by a nearly vertical motion of the tail. In such cases both eyes are on the same side, and the whole structure of the fish, especially the skeleton of the head, presents an unsymmetrical aspect of a very extraordinary kind.3 In many cartilaginous fishes, such as Rays (commonly called Skates), the absence of the swimming bladder seems compensated by the enormous size of the pectoral fins, which, of all the external organs, are probably the most efficient in raising the body, as the caudal ex¬ tremity is the power chiefly employed during an onward course. The Lamprey, which has neither swimming bladder nor pectoral fins, dwells in the mud. Flat fishes being un¬ provided with swimming bladders, are supposed for that reason to raise themselves with difficulty to the surface; and they do not appear to strike the water laterally like other fishes, but swim rather after the manner of the Cetacea, by a motion alternately up and down. In all the other animals of this class the chief organ of progressive motion is the tail, or prolongation of the body, terminated by a caudal fin, the position of which, unlike that of the great aquatic mammalia called whales, is vertical. The reason of the difference is obviously this: a true fish, pos- Introduc- tion. Vascular System. 3 ransa^ons of the Royal Society of Edinburgh, xxi., p. 245, 1855. 2 De Aure et Auditu, &c. n several insects of the genus Blatta we have observed a want of symmetry both in the size and markings of the elytra. We do * ot mean an accidental variation of one side, but an evidently pre-ordained disparity of form and colour VAT "V TT A ^ ICHTHYOLOGY. 226 Classifica- sessing the power of extracting air from water by means of tion. its giHs does not (except at rare intervals) require to mount ' v ' to the surface for the performance of the vital act of respi¬ ration; but all cetaceous animals being furnished with lungs, which cannot perform their functions except through an immediate communication with the atmosphere, require their bodies to be terminated by a horizontal expansion, the action of which is the most efficient for an ascending course. It is however, difficult to account for the fact that so con¬ siderable an organ as the swimming-bladder should have been denied to so many species, not only of the more in¬ dolent kinds, which dwell composedly at the bottom of the waters, but to many others which yield to none of their class in the ease and velocity of their movements. Its pre¬ sence or absence does not even accord with the other con¬ ditions of organization; for while it is wanting in the com¬ mon Mackerel, it is found to occur in a closely allied species, the Scomber pneumatophorus of Laroche. Weber has pointed out a remarkable connection between the air- Classifica- bladder and the acoustic organs in the head. tl0n- We have already alluded to a singular peculiarity con- v~*-/ nected with the organization of certain fishes we mean the power of conveying electrical shocks. In Torpedos, the apparatus consists of two organs, built up of membranous tubes filled with mucous matter, divided by transverse chambers closely set together, like the cells ol honeycomb, and disposed in two groups placed on each side of the head. They receive enormous branches of nerves from the fifth and eighth pair. In the Gymnotus the electric organs are four, and occupy the under surface of the body throughout its entire extent to a considerable thickness. It is composed of parallel plates separated by thin layers of mucilage. The effect of this natural galvanic pile will be detailed in the course of the systematic portion of this article, when we shall have occasion to mention the electric fishes in their proper place. CLASSIFICATION OF FISHES. A “ natural arrangement” of fishes or of any other class of animals implies an accurate knowledge of their whole struc¬ ture, internal as well as external, by which they can be grouped in the order of their affinities, placing those species together which agree with one another in the greatest number of important characters. Naturalists have gene¬ rally come to the conclusion that the series of species is not a linear one ; some have one portion of their frames, some another, specially organized for the part the species has to play in the system of nature; and so the affinities branch off in several directions. The nervous system being that by which an animal has perception of external objects, and directs its motions accordingly, and which presides moreover over those operations of organic life that are not obedient to the will, would be one important basis of classi¬ fication, but its various modifications of structure in fishes are still too imperfectly known, and the labour and skill necessary for the elucidation and discrimination of its parts and their functions are such that, practically, it has hitherto been as yet but little referred to in the arrangements of the systematic ichthyologist. The same is true in a greater or less degree of the other parts of the organism employed in nutrition, respiration and circulation, secretion, genera¬ tion, and development; most of the arrangements of fishes that have hitherto appeared being based on the organs of locomotion and the external integument, the latter the most variable certainly that could have been chosen, but at the same time the least important. We have scaly, partially scaly, and scaleless species in the same genus o some particular groups. Agassiz has been labouring assi¬ duously on embryonic development as a basis of ai range- ment; but as far as we know, has not yet published a system founded on his researches in this direction. All attempts at classification of fishes which have hitherto been given to the world, violate more or less anatomical affinities; the best on the whole that has been pi’oposed, is that of Pio- fessor Johannes Muller, which we shall follow, adopting the modifications of Professor Owen. It would be a great help to the memory were the divisions of the class of equal rank to approach to equality also in the number of species that they embrace, but this cannot be ; though most probably the disparity in the size of the groups would be considerably lessened were we acquainted with all the species secluded in the depths of the sea, and still unknown, as well as with the forms of the extinct fishes. The Salamandroid Ganoids which abounded in variety and number in another epoch of the earth’s history, have only a few existing representa¬ tives ; and of the palaeozoic fishes with soft skins that are less likely to be preserved than the strongly cuirassed Ga¬ noids, we know absolutely nothing, not even that such were then created. In his arrangement of fishes, Muller finds characters which he considers to be of the highest importance in the vascular system. The heart of fishes is a venous or bran¬ chial one, consisting of an auricle in which the veins tei- minate, and a ventricle for transmitting that venous blood to the gills where it is aerated and whence it circulates through the body without the intervention of a special pro¬ pelling organ fixe the systematic side of the heart of a higher animal; but merely through the general contractile power of the arteries. In most fishes there is a thick muscular swelling of the commencement of the arterial system close to the ventricle, and which, in fact, may be called a third chamber of the heart. The blood is pre¬ vented from regurgitating into the ventricle on the con¬ traction of the bulb by valves; and the number of these valves, and the presence or absence of the thick muscular coat of the bulb, furnish characters of groups so constant, that M filer says he is acquainted with no others, either anatomical or zoological, which equal them in certainty. The Plagw- stomi, or cartilaginous fishes, as restricted by the removal of several groups that were included among them by the older ichthyologists, have three or more longitudinal rows of valves within the muscular bulb. A still greater number of valves are present in the bulb of the existing Ganoids; but in the laro-e group formed by the osseous fishes after the Ganoids have been removed from them, two opposite valves are placed at the origin of the bulb, and no more. This great group Muller names Teleostei, or perfect osseous fishes ; and he includes in it the six following orders mentioned in the subjoined table—Acanthopteri, Anacanthini, Pharyngo- qnathi, Physostomi, Plectognathi, and Lophobrandm. The Cyclostomes of Cuvier, or the Suckers, want the bulbus arteriosus, or thickened muscular tunic, but have two valves at the origin of the branchial vessel like the Teleostei; while the Lancelet {Amphioxus) wants the heart itself, the circulation being carried on by the muscularity of the entire vascular system. This fish, therefore, he con¬ siders as the type of a sub-class which he names Lejpto- cardii. Another sub-class, termed includes fishes which have scales, with both lungs and gdls. In all, he makes six sub-classes of fish—1. Teleostei; 2. Dipnoi; 3. Ganoidei; 4. Elasmobranchii; 5. Marsipobranchn or Cyclostomi; 6. Leptocardii. In the subjoined modifica¬ tion of his arrangement by Professor Owen, these su - classes are not preserved, the class being sub-divided in o nine orders, and again into sub-orders. A few changes have been made by us in the termination of the names ot Classifica- tion—Der- mopteri. ICHTHYOLOGY. 227 families, to reduce them to an uniform nomenclature, and some groups that have been recently characterized have been introduced. CLASS OF FISHES. Order I.—DERMOPTEROUS FISHES. Sub-Ordee I.—PHARYNGOBRANCHS. This order is named from the cutaneous vertical fins, in which the mucoid rays are extremely soft and delicate, or altogether imperceptible, and from the want of pectoral or ventral members. The first two sub-orders are founded on the different developments of the respiratory organs. In the first the pharynx itself is organized for respiration, and two processes having the function of gills project freely into the cavity of the mouth; the water necessary for respiration flowing over them by the same canal which carries the food; there being no lateral gill-openings through the skin. Of this sub-order the best known representative is the Amphioxus lanceolatus of Yarrell {Branchiostoma lubricum, Costa), which was first made known to the world as a Limax or Slug by Pallas, who received it from, the Cornish coast. Recently Mr Couch rediscovered it on the same shores, and Mr Yarrell has described it in his excellent work on British Fishes, ac¬ cording to its true affinities as a fish, though its want of a head was puzzling. Its structure has since been in¬ vestigated by Ratke, Johannes Muller, Owen, Goodsir, Swan, and other first-rate comparative anatomists,—many specimens having been procured among the gravel and rocks of the sea-beaches in the south of England, also in the Irish Channel, on the Norway coast, and in the Medi¬ terranean. The longitudinal slit forming the orifice of its mouth, resembles, to the unassisted eye, that of a Lamprey, its jointed labial feelers looking like moveable teeth. It is a thin semi-transparent creature about an inch and a half long, without jaws, but having a large buccal cavity into which the short vascular processes that perform the function of gills project freely, without cartilaginous supports or lateral attachments. The buccal cavity communicates by a small pharyngeal opening with a wide barrel-shaped oesophagus, which occupies more than a fourth of the whole length of the fish, and whose interior surface is ciliated throughout, and organized to assist in respiration. Vessels that ramify over its vertical ciliated bands communicate with the dorsal and ventral portions of the vascular trunk that carries on the circulation, without the intervention of a central propelling organ. There is, however, beneath the posterior end of the expanded oesophagus a small widening of the circumferential vessel which pulsates rythmically, and which Professor Owen considers to be a rudimental representation of the branchial heart of the Myxinoids, the next order of fishes in point of organization. The peculiarity of shape which distinguishes the Lancelet from all other fishes, arises from all its nerves of the senses devolving from the myelon or spinal marrow, without the production of a ganglionic brain, and consequently, without the necessary expansion of the protecting integuments which make the head, and in animals more advanced in the scale, provide sockets for the sense capsules. The only cartilaginous part of this fish is a jointed haemal arch which extends from the anterior end of the spinal chord on the ventral aspect to the orifice of the pharynx, and serves to support the oral filaments. It represents the labial arch of the higher Myxinoids. Though this little creature wants jaws, it has, as we have just mentioned, a large buccal cavity which, as in other fishes, admits not only food, but also aerated water, to the respiratory organs, and an enormous oesophagus having the double function of deglutition and respiration. The intestine proceeding from the oesophageal Classifica- bag is slender, almost straight, and terminates at the anus, tion—Der- about one-fourth of the whole length of the fish from the m0Pter1^ point of its tail. In its motions, the Lancelet is lively and active, and shelters itself quickly from observation among the gravel. In 1853 Sundevall distinguished two American spe¬ cies of Amphioxus or Branchiostoma, the B. caribceum from the West Indies, and elongatum from Peru; but Professor Peters on comparing the species found that caribceum was identical with the European one. Dr Gray has described a Borneo specimen as a distinct species, so that the genus probably is not so poor in species as was at first supposed. CLASS.—PISCES. Order I.—DERMOPTERI. Vermiform, abrachial and apodal; endo-skeleton unossified; exo¬ skeleton and vertical fins muco-dermoid; no pancreas; no air-bladder. The devolopment of the skull in the Dermopterous fishes is ar¬ rested at more or less embryonic stages, but in each genus it pro¬ ceeds in a specific direction ; thus, in the Lancelet, evolving an articulated labial arch and its numerous filaments; and in the Myxinoids and Lampreys forming a more complex system of lateral and labial cartilages; or modifying the palatine, maxillary, and hyoid rudiments in relation to the suctorial function of the mouth. The olfactory organ, which is double in all other fishes, is single in this order ; and the eye is rudimentary, being merely a small fold of skin coated with a speck of dark pigment. It is probable that this point is sensitive to light, as the lowest member of the order, the Lancelet, quickly secludes itself among gravel when ex¬ posed to light. In Ammoccetes and the Myxinoides the cartila¬ ginous capsules of the acoustic organs retain the embryonic posi¬ tion of projecting spheres at the base of the cranium ; these are less prominent in the Lampreys; in the Plagiostomes they are imbedded in the walls of the cartilaginous skull; and in the bony fishes they are walled up by ossification. The oral filaments and soft integuments of the anterior end of the Lancelet and Myxines receive many nervous twigs from the fifth pair ; and touch seems to be the most important sense in these low vertebrals. Sob-Order I.—PHARYNGOBRANCHII. Cirrhostomi, aliorum. Gills free, pharyngeal; no heart. A single genus of few species. Family I.—AMPHIOXIDJE. Genus I. Amphioxus, Yarrell. (Branchiostoma, Owen.) Re¬ spiratory processes projecting from above the pharynx into the large cavity of the mouth. Interior mucous coat of the widely dilated oesophagus organized for aerating the blood. Mouth eden¬ tate, furnished with exterior labial barbels. Sub-Order II.—SUCKERS. Genus Heptatrema, Dum. (Bdellostoma, Miill. Act. Berol, 1838.) A single species is known, the Petro- myzon cirrhatus of Forster, who discovered it in Queen Charlotte’s Sound, on Cook’s second voyage. It has since re¬ ceived the appellations of Heptatremus Dombeyi and Bdel¬ lostoma Forsteri. It is a lively, active fish, inhabits rocky bottoms, lies in wait for fishes on which to prey, and was frequently taken by our voyagers adhering to pieces of fish which had been let down into the sea as bait. It has the power of emitting an immense quantity of mucus from all parts of its skin. The New Zealanders roast and eat it. Myxine, Linn. (Gasterobranchus, Bloch.) The species best known, Myxine glutinosa, Linn., or Glutinous Hag, was classed by Linnaeus with the Vermes. The mouth is a membranous ring, with a single tooth on its superior part; while the strong teeth of the tongue are arranged in two rows on each side, so as to give to these animals the appearance of having lateral jaws, like insects or Nereides ; but their tongue performs the office of a piston in exhaust¬ ing the mouth so as to enable them to adhere to other 228 ICHTHYOLOGY. Class! flea- bodies, like the Lamprey. The lips are furnished with eight tion—Der- cirrhi, and above is a spout-hole communicating with the mopferi. mout]1. tjie iJOt}y is nearly cylindrical, and terminates in a fin which surrounds the tail. The intestine is simple, wide, and straight, as viewed externally, but it is plaited within ; the liver has two lobes; the eggs grow to a considerable size. When taken and confined in a large glass jar, a single fish will pour so much mucus from its lateral pores as to give the water the appearance of jelly. Ammoccetes. Body cylindrical, with numerous annular lines around it, that give it much the appearance of a worm. It lives in the mud of rivers. Mouth incapable of adhering by suction to other bodies; fins very shallow; tail sharp at the tip. The only species is P. branchialis, Shaw (the Pride of Pennant), which grows to six or eight inches long, and is as thick as a goose-quill. It inhabits the rivers of Oxford¬ shire, and occurs in various parts of the European continent. Petromyzon, Dum., or Lamprey. The tongue, acting like a piston in the circular mouth, is capable of vigorous motion, and is an essential part of the mechanism by which the fish is enabled to attach itself firmly to stones, or to fasten itself to the larger fishes, which it is thus enabled to suck and devour at its leisure. The dorsal fin is farther forward than the anus, and a second unites with the tail. The European species are,—P. marinus, the Greater Lam¬ prey, which grows to the length of more than three feet. It is considered as a delicate food, and is caught as it ascends rivers in the end of winter and spring. Colour yellowish, marbled with brown. First dorsal fin very dis¬ tinct from the second. This fish is common in the Severn, and in the mouths of many European rivers. Its supposed hermaphroditism is mentioned by Sir Everard Home.—P. fiuviatilis, the Lampern, or Nine-eyed Eel. Length from twelve to eighteen inches ; olive back, silvery below ; first dorsal distinct from the second. Two thick teeth, separate, in the top of the maxillary ring. Ascends rivers from the sea; swarms in the Thames, Severn, and Dee. Vast quantities taken in England are sold to the Dutch for the Turbot fishery. It abounds in the rivers on the southern side of the Baltic. Both these animals are very tenacious of life, and will live many days out of water.—P. planeri. About ten inches long; greatly resembles the preceding; but the two dorsal fins are united. It is also an European river fish. Figs. 61, 62 show the dentition of Petromyzon mordax, an Australian species ; the lips and their teeth be¬ ing shaved off in the latter to show the pharyngeal teeth. Fig. 63. Fig. 49 represents the lateral gill-openings of the same species, and fig. 63 the entire fish. Sub-Oruer II.—MARSIPOBRANCHII. Cyclostomi, Dum., Cuv. Gills fixed, bursiform, inoperculate, receiving the respiratory streams by apertures usually numerous and lateral, distinct from the mouth ; a heart. These are vermiform fishes whose vertical fins are folds of skin surrounding the tail, and the rays scarcely to be perceived in any part, being soft and rudimental. They are the first in the ascend¬ ing series of fishes in which the anterior end of the myelon has that ganglionic development which constitutes the brain in fishes, and which have a cartilaginous cranium for its protection. In Ammoccetes the persistent cranial cartilage resembles the first appearance of the cartilages in the embryo of the higher fishes. In the Myxinoids the neural and haemal canals of the spinal column are formed of layers of the sheath of the gelatinous dorsal chord; the neural canal extending along the whole upper part of the chord, and the haemal canal being confined to the tail. In the Petromyzons cartilaginous plates are developed in the fibrous sheath, which is the first indication of neural arches. A cartilaginous barrel-shaped Classifka- basket, homologous with the branchial skeleton of osseous fishes, is tion Der- provided for the support of the gills and the canals leading to them, mopteri. This cartilaginous frame-work is termed by Cuvier cotes branchi- <. » ales ; and he observes, that though it is much developed in the Cy- clostomes, it is scarcely perceptible in the Rays and Sharks. There are no other ribs in this order. The Marsipobranchs, however, re¬ semble the Plagiostomes in having an undivided cephalic cartilage, a spout-hole in the head, and a spiral valve in the intestine. In all other respects they differ from them, and especially in the complete absence of gill-arches, want of jaws, in the total absence of a muscular tunic to the bulbus arteriosus, and in the arterial valves be¬ yond the branchial opening of the ventricle being only two; they differ further in the genital organs of the one sex having no ovi¬ duct, and in the other no seminal duct. The gills of Lampreys and Myxines are little bags, each of which has its proper artery; and its proper orifice in the pharynx through which the water flows in to pass out on the dermal side by another hole. These purse-shaped bags are called fixed lungs, in contra¬ distinction to the gills of osseous fishes, whose exterior edges are free and pectinated ; but Pi’ofessor Owen has observed that if one side of one of the sacs were adherent to the adjacent side of another, and then each bag slit open and detached from the outer integu¬ ment, a gill would be formed receiving its blood from two arterial branches, and resembling, were it pectinated, the gill of an osseous fish. The genera have been characterized by the number of the exterior gill-openings. The teeth in the Marsipobranchs are composed of indurated albu¬ minous matter, and when macerated, flake off in successive hollow cones. Agassiz, from investigations into the embryology of fishes, thinks that the Marsipobranchs are not a proper order of fishes, but merely embryonic forms of the more developed Sharks and Rays from which they ought not to be dissevered in our systems. Family I.—AMMOCCETIDjE. Genus I. Ammoccetes, Dum. Mouth semicircular, edentate, the posterior lip being transverse, cirrhated within ; gill-bags seven, each with an external lateral aperture, and receiving streams of water from the oesophagus without a separate trachea. Olfactory organ single, opening in the median line of the dorsal surface of the head, whence a narrow canal, strengthened by cartilaginous rings, runs to the bottom of the skull, and terminates by a valvular opening in front of the occipital cartilage. The pituitary lining is plaited longitudinally. Agassiz describes a new species, A. borealis. Family II.—MYXINIDAh Internal branchial openings oesophageal and equal in number to the branchial sacs; external ones as many, lateral ; or only one common to all the gills of a side, and then situated on the ventral aspect; four barbels on the snout, and two on each side of the mouth which is circular; one tooth on the roof of the mouth, two rows on the tongue. Eye as lowly organized as in the Lancelet. Naso-pala- tine tube having a valve at its opening on the roof of the mouth. Genus I. Myxine, Lin. KGastrobranchus, Bloch.) Saccular gill-bags, six on each side, receiving the streams of water from the oesophagus by as many short tubes. The efferent tubes empty the water into a common lateral canal which terminates on the ventral aspect of the fish at the end of the first third of its length. Be¬ tween this aperture and its fellow of the other side, there is a larger opening rather to the left of the mesial line, which admits the water into the oesophagus. Genus II. Heptatrema. Seven lateral branchial apertures. At the extremity of the snout a depressed opening of a canal lead¬ ing to the gills. Four rostral cirrhi; as many labial ones. Eyes white lateral points. Family III.—PETROMYZONTIDAS. Branchial organ of each side divided by transverse partitions into seven fixed chambers, which receive the water from a median canal, distinct from the oesophagus, by as many round holes, and permit it to flow out by an equal number of lateral cutaneous ori¬ fices ; the median canal lies beneath the oesophagus, opens anteriorly into the fauces by a doubly valvular orifice, communicates with the gill-chambers to the right and left, and is closed at the pos¬ terior end. Nostril single; tubular on the top of the head, leading to a globular nasal sac from a tube that descends to the base, of the skull and the membrane of the palate, which closes it, leaving no perforation there. Cuvier compares this tube to a trachea. Mouth variously armed with teeth. Genus I. Petromy'zon, auctorum. Dr Gray has recently proposed a new arrangement of the Lam¬ preys. ICHTHYOLOGY. 229 Classifiea- («•) SUB-FAMILY.—PETROMYZONINA. iion—Her- (With distinct teeth and eyes.) mopteri. Genus I. Petromyzon. Two conical upper pharyngeal teeth close together; a single crescentic under one ; numerous conical la¬ bial teeth, two fringed lingual ones. P. marinus, and four other species. Genus II. Lampetra. Upper and under pharyngeal teeth transversely crescentic ; labial teeth in two rows on the border of the lips; more interior lateral teeth bigger, irregularly twice or thrice notched ; lingual teeth pectinate. P. fluviatilis, planeri, and two other species. Genus III. Geotria. Upper and under pharyngeal teeth transversely crescentic, the upper one-lobed; labial teeth nume¬ rous, remote, pointed, the interior ones the biggest; lingual teeth long, conical, curved. One species. O. australis. Genus IY. Velasia. Upper and under pharyngeal teeth trans¬ versely crescentic; the upper bilobate ; labial teeth narrow, trun¬ cate, the interior ones the biggest; lingual teeth rather long, curved. V. chilensis. Genus V. Caragola. Two upper, three-lobed, pharyngeal teeth, widely apart; under one crescentic, nine-lobed; labial teeth four- bundled ; lingual teeth flat. 0. lapicida. Genus VI. Mordacia. Two upper pharyngeal teeth ; the la¬ teral ones trilobate; nine under conical ones in a curved row; labial teeth conical, in a single series on the margin of the lip ; lingual teeth long, conical, curved. P. mordax. (b.) SUB-FAMILY.—AMMOCCETINA. (Without teeth and with obscure eyes.) Genus VII. Ammoccetes. Five species. Sub-Order III.—RIBBON APODALS. These delicate, semi-transparent, and scaleless fishes are inhabitants of all the oceans, and the species are probably numerous, though it is only in localities where much atten¬ tion is paid to fish that they are likely to be noticed. They are many, and of considerable variety of form in the Mediterranean, and one species is occasionally taken by keen naturalists on the English coasts. Several have been described that inhabit the Indian seas; and on Sir James Clark Ross’s antarctic voyage one specimen was obtained in a high southern latitude. The absence of ossification in the skeleton, the gelatinous condition of the sheath of the spinal marrow, which, in the form of a “ chorda dorsalis,” reaches into the base of the skull; and the persistence of the pri¬ mordial cartilaginous cranium are reasons for placing these fishes with the Dermopteri. Sub-Order III.—APODES LEMNISCATI. Ribbon-shaped, extremely compressed fishes. Gills free, sub- operculate; no air-bladder. Skeleton cartilaginous; no scales. Blood colourless ; no spleen. Family I.—LEPTOCEPHALIDiE, Bon. Helmichthyidas, Koll. Small, greatly compressed, blade-shaped, apodal, diaphanous fishes, totally destitute of scales, with a late¬ ral line formed by the intersection of the muscular layers; some have, some want teeth; and the pectoral fins are also present in some species, and wanting in others. The anus is placed on the ventral edge of the fish, before or behind the middle, and the simple straight gut runs near the ventral edge of the fish. Their skeleton is very incomplete and cartilaginous, and the myelon is obscurely visible through it. In most, the anal and dorsal, uniting at the end of the tail, form a pointed or blunt, but very seldom a forked caudal, in which the rays are generally discoverable. Genus I. Esunculus, Kaup. Leptoccphali with small pecto¬ rals and a forked caudal. One species, Italy. Genus II. Hyprorus, Kbll. Jaws straight, much elongated, with merely traces of dentition. Hinder nostrils before or over the eyes; muciferous pores along the jaws and round the eye. Body elevated and gibbous at the occiput; tail pointed. Pectorals niinute; rudimentary anus before the middle; caudal not distinct from the other vertical fins. One species, Messina. Genus III. Oxystomus, Rafin. (Tilurus, Roll.) Distinguished from Leptocephalus by the rayless, cutaneous dorsal fin com¬ mencing at the occiput, and by the upper and under transverse muscular bands not making an angular interruption or break anteriorly at their intersection; no anal fin; anus far back, near where the tail is attenuated into a longish filament. Head small; Classifica- mandible a trifle longer; pointed teeth on both jaws ; gill-openings tion Der- furnished with distinct opercula, and squeezed together on the mopteri. throat. Three species. v , Genus IV. Leptocephalus, Lin. (Helmichthys, Rnfin.) Dis- tinguished from Oxystomus by none of the species having the tail so prolonged into a hair-like point, and by the muscular bands making a distinct angular intersection anteriorly. Some species have, others want teeth ; there are species in which the teeth can be seen only through a microscope, and others whose pointed teeth are distinctly visible to the naked eye. Most have small pectorals, but some show not even a trace of these fins. At the end of the gut there is an anal opening as fine as a hair, which gives exit to the fluid excrement. Eighteen species. Genus V. Cheilobranchus, Rich. Form compressed; body linear-lanceolate. Head very small; snout obtuse; jaws equal. Mouth small; teeth uniserial, acute, becoming blunt with age, closely ranged so as to form an incisorial series; lips loose. Anus before the middle ; dorsal and anal mere cutaneous folds without rays or interneural hones ; a single interneural at the point of the tail, which supports seven or nine jointed rays; caudal united with the cutaneous dorsal and anal; muscular layers forming chevrons, which have the apex of the angle on the lateral line, and directed forwards, as in Leptocephalus; abrachial and apodal. Gill-opening under the throat, a small transverse slit, common to the two side”, without a division in the middle; the edge of the membrane free; a cutaneous fold, ending on each side in a minute lobe, forms the posterior edge of the opening, and seems to be capable of acting like a valve, with the aid of an interior membranous fold; bran- chiostegals three; a minute genital papilla; a single pancreatic caecum was observed; the intestine appeared to be straight, with a stomachal dilatation. The skin is smooth, but minutely pitted, as if from microscopical sunken scales. Vertebra; 73, ossified. Two species—one obtained at Penguin Island, in Lat. 72. S. Order II.—MALACOPTEROUS FISHES. Sub-Order I.—SERPENTIFORM APODALS. In the Lancelets, the only representatives as yet known of the order of Dermopteri, we have seen that the skeleton is membranous, that the spinal nervous chord is continued to the anterior end of the fish without expansion, and that in conformity with this simplicity of the nervous centre, the head cannot be distinguished from the body, and may be said to be wanting,—the only part of the face that is deve¬ loped being the mouth and oral filaments. In the Suckers the skeleton rises from the soft membranous condition of that of the Ammocete, to the production of a tendinous spinal chord filled with gelatine, and partially encompassed by cartilage ; teeth exist on the palate and lips, though as yet seated only in the soft parts, and formed of indurated mucoid matter; while the jaws are wanting. The group we have now to speak of consists of fishes with a well ossified skeleton, and a head that is at once recognised as such, but with the bones of the face less fully developed than in osse¬ ous fishes more highly organized. A single bone represents the nasal, ethmoid, and vomer, or it may be said that these three bones have coalesced into one, which is firm and strong. I he pre-maxillaries and the maxillary are wanting, the pala¬ tines coming in contact with the lips to form the lateral portions of the upper jaw, which are opposed to the man¬ dible,—the teeth which arm these bones standing in reverse order with regard to one another; for instance, when they are biserial, and the inner row is the tallest on the palatines, the outer row of the mandibulars is the tallest, and is op¬ posed to the lower rank of the palatines. In the mammals a similar reversal of the sides of the molar teeth may be noticed in comparing the upper and lower jaws. This sub-order does not embrace all the fish that want ven¬ tral fins, there being many examples of such in other groups, but it may be viewed as presenting an analogy to the Ceta- cei among mammals. Neither does the vermiform type be¬ long exclusively to these Apodals; we shall find it mani¬ fested repeatedly in other parts of the series of fishes. Ihe table in small type gives the technical characters 230 ICHTHYOLOGY. Classifies- of the various divisions and sub-divisions of the order, and tion—Ma- our iimits wiH not permit us to do more than to notice a lacopten. pgw op ^ Species tiiat inhabit the British waters, or that v r ^ are otherwise interesting from some particulars in their history or economy. In this order the forms of the teeth vary greatly. In a few species they are mere grinding machines, in the majo¬ rity, long, slender, and sharp for the retention of their prey; in others, they are variously lobed, fine-edged, cutting instruments. On these different kinds of dentition, the genera and minor groups are, in many instances, founded. The arrangement of the entire sub-order is that of Dr J. Kaup of Darmstadt, from whose catalogue, written for the British Museum, we have borrowed it. Fig. 64. Mur ten a pavonina. The Murama Helena, or Roman Mureena, abounds in the Mediterranean, andwas introduced by the luxurious Romans of antiquity, in crystal vases, to the table before being cooked, that the guests might admire its variegated skin. This fish is very voracious, and feeds on all sorts of animal matter. The Romans fed them in ponds, and Pliny has recorded the atrocities of Vedius Pollio, who used to punish his offending slaves by throwing them alive to his Mureence. We have seen this fish repeatedly taken at Gibraltar, between three and four feet in length. The skin is beauti¬ fully marbled with yellow sub-angular markings on a rich brown ground. When captured in nets it lives long out of the water, and is capable of biting very severely, from the sharpness of its numerous teeth. A Murry is noticed in the narrative of Cook’s Third Voyage to the Pacific in these words :—“ Amongst these were some large eels, beautifully spotted, which, when fol¬ lowed, would raise themselves out of the water, and endea¬ vour, with open mouth, to bite their pursuers.” Fig. 65. Sidera pantherina. The Anguillidee are a family whose members exhibit little variety of form, and it contains only a single genus. From the common Eel, however, most of our ideas respect¬ ing the Apodals have originated. Anguilla vulgaris. We have observed these fish in considerable numbers leaving fresh-water lakes in the night time, and frequenting mea¬ dows, seemingly for the purpose of preying on slugs and snails. They easily move on the land, with a motion re¬ sembling that of snakes. The Eel grows to the size of two or three feet, and is sometimes said to reach five or six feet Classifica- in length. It abounds in many European rivers. Eels are tion—Ma- caught in immense numbers in the rivers emptying them- lacoPteri. selves into the Baltic ; and they form a considerable article of trade. Two thousand are stated to have been caught at one sweep in Jutland; and in the Garonne 60,000 were taken in one day by a single net. “ That Eels migrate towards brackish water,” observes Mr J esse, “ in order to deposit their roe, I have but little doubt, for the following reasons. From the month of November until the end of January, provided the frost is not very serious, Eels migrate towards the sea. The Thames fishermen are so aware of this fact, that they invariably set their pots or baskets with their mouths up stream during those months, while later in the spring and summer they are set down stream. The best time, however, for taking Eels, is during their passage towards the sea. The Eel-traps, also, which are set in three different streams near Hampton Court (the contents of which, at different times, I have had opportunities of examining), have invariably been supplied with Eels sufficiently large to be breeders, during the months I have mentioned. This migratory disposition is not shown by small Eels; and it may therefore be assumed that they remain nearly stationary till they are old enough to have spawn. I have also ascertained that Eels are taken in greater or lesser numbers during the months of November or December, all the way down the river to the brackish water. From thence the young Eels migrate, as soon as they are sufficiently large and strong to encounter the several currents of the river, and make their way to the different contributary streams. I have also been able to trace the procession of young Eels, or, as it is called here, the Eel-fair, from the neighbourhood of Blackfriar’s Bridge, as far up the river as Chertsey, although they probably make their way as far, or farther than Oxford. So strong, indeed, is their migratory disposition, that it is well known few things will prevent their progress, as, even at the locks at Teddington and Hampton, the young Eels have been seen to ascend the large posts of the flood-gates, in order to make their way, when the gates have been shut longer than usual. Those which die stick to the posts ; others, which get a little higher, meet with the same fate, until at last a sufficient layer of them is formed to enable the rest to overcome the difficulty of the passage. A curious instance of the means which young Eels will have recourse to, in order to perform their migrations, is annually proved in the neighbourhood of Bristol. Near that city there is a large pond, immediately adjoining which is a stream. On the bank between these two waters a large tree grows, the branches of which hang into the pond. By means of these branches, the young Eels ascend into the tree, and from thence let themselves drop into the stream below, thus migrating to far distant waters, where they increase in size, and become useful and beneficial to man. A friend of mine, who was a casual witness of this circumstance, in¬ formed me that the tree appeared to be quite alive with these little animals. The rapid and unsteady motion of the boughs did not‘appear to impede their progress.” “ All authors agree,” adds Mr Yarrell, “ that Eels are extremely averse to cold. There are no Eels in the Arctic regions, none in the rivers of Siberia, the Wolga, the Danube, or any of its tributary streams. It is said there are no Eels in the Caspian or Black Seas, but they abound in the Mediterranean ; and M. Risso has described eight species in his work on the Natural History of the Environs of Nice. There is no doubt, also, that fishes in general, and Eels more particularly, are able to appreciate even minute alterations of temperature in the water they inhabit. The brackish water they seek to remain in during the colder months of the year, is of a higher temperature than that of the pure fresh water of the river, or that of the sea. ICHTHYOLOGY. Classifica- It is a well-known law in chemistry, that when two fluids tion—Ma- of different densities come in contact, the temperature of lacopteri. t}le mixture is elevated for a time, in proportion to the difference in density of the two fluids, from the mutual penetration and condensation. Such a mixture is constantly taking place in rivers that run into the sea, and the tempe¬ rature of the mixed water is accordingly elevated.” As Eels are well known to breed in ponds, it may be inferred that their descent to the brackish water, though customary, is not indispensable. They sometimes attain a great size. The species (or variety) called the Sharp-nosed Silver Eel has been taken near Cambridge of the weight of twenty- seven pounds. Order II.—MALACOPTERI. Physostomi, Mttll. Endo-skeleton ossified; exo-skeleton, in most as Cycloid, in a few as Ganoid scales. Fins supported by rays, all, save the first, sometimes in the dorsal or pectoral, soft or jointed abdominal or apodal. Gills free, operculate; a swim-bladder and air-duct. Sub-Order I.—APODES ANGUIFORMES. Malacopterygii apodes (partim), Cuv. Elongated fish more or less ajjproaching to vermiform, covered with a thick slimy skin; the majority scaleless, but in some genera small scales are imbedded in the skin. No developed ribs in the skeleton. Stomach ca;cal. Pancreatic caecal appendage to the intestine wanting. The greater number have a swimming-bladder, which is often very curiously formed, but never double. Fin rays simple, not jointed. Section A.—Phaneromycteres. Labial olfactory organ opening by the posterior nostril on some part of the head above the mouth, so as to be exposed. Family I.—SYNBRANCHIDJE, Kaup. Uni-aperturidas, auct. Both gill-openings enveloped by a border of the common integument, so as to present externally only a single medial orifice. Pectorals and other fins wanting, or almost obso¬ lete. Species few, confined to the seas of Asia and South America. Genus I. Amphipnous, Miill. (Unibranchapertura, Hamilt. Buch.; Synbranchus, Cuv.; Ophichthys et Pneumabranchus, M'Clell.) A membranaceous partition separates the branchial efferent tubes, and is continued to the verge of the common orifice. Four gills, the third one having short fringes; the fourth, a membrane with merely faint notches on its extremity. Vomerine teeth strong, in two rows, eight in each, standing well apart; palatine teeth small and thin, a little larger on the point of the bone ; mandibular teeth pluriserial at the symphysis, uniserial towards the corner of the mouth. On the occiput there is a sac which can be filled with air, and is connected with the gills. Fine scales form a multitude of elevated longitudinal lines on the body. The only trace of a fin is a slight one on the thin tapering end of the tail. One species, A. cuchia. Genus II. Ophisternon. (Unibranchapertura, Lacep.; Ophi- sternon, M'Clell.; Synbranchus, Cant, and Bleek.) Four fringed branchial arches, which discharge the water that has passed over them by two tubes divided by a thin partition, inclosed by the skin of the throat so as to form one transverse oval opening. No air-bag on the occiput, and no swim-bladder. Branchiostegals six, bony. Posterior apertures of the nostrils between the eyes; an¬ terior nostrils minute, one on each side of the snout. Teeth fine, blunt on the upper jaw, almost setaceous, crowded into a triangle on each side of the symphysis; vomerine teeth larger, in a single series; mandibular ones somewhat bigger still, and truncated. One species, 0. bengalensis. Genus III. Synbranchus, Bloch. Have all the characters of Ophisternon, but the four fringed gills are not separated under the throat by a partition, and the solitary gill-opening does not make the angular inflection that it does in Monopterus, Ophisternon, and Amphipnous. Hinder nostrils opening above the eyes, and capable of being shut by a cutaneous flap. Two species, one Indian, the other South American. Genus IV. Monopterus, Lacep. Three gills only. No occi¬ pital air-bags. No protruding nasal teeth; the palatine teeth meet m an angle with the vomerine ones anteriorly, and are there pluri¬ serial, but diminish to two and one row towards the corner of the mouth; vomerine teeth triserial anteriorly, uniserial posteriorly ; ranged in two bands, which meet in an acute angle anteriorly, and 231 diverge posteriorly. Like Amphipnous and Ophisternon, the ex- Classifica- erior gill-opening is angular, and below the outer integument there tion Ma- is a membranous partition between the gills. One species, M. lacopteri. javanicus. ^ ^ y Family II.—MURAlNIDyE, Kaup. In most of the genera no pectorals. Gill-openings lateral. Skin smooth and slippery, without scales. Mostly or wholly marine fishes. (a.) SUB-FAMILY.—MURA2NINA5. Uniserial teeth on nearly all the dentiferous bones of the mouth. Genus I. Mur^ENA, Kaup. Uniserial nasal teeth, three on the mesial line. Twenty-four species. Figure 64 represents Murcena pavonina. Genus II. Sidera, Kaup. Only one short conical tooth on the mesial line; biserial, low, granular teeth on the vomer, the rows coalescing in a point posteriorly; opening of the jaws not wide. Skin spotted. Two species. Figure 65 represents Sidera pan- therina. (b.) SUB-FAMILY.—THYRS0DEINA3. Within the outer palatine teeth, a second row that varies much in the number of teeth which compose it. Genus III. Enchelynassa, Kaup. Fore nostrils short, infun- dibuliform, and capable of being closed by a cutaneous tag of its hinder border ; hinder nostril longish, oval, surrounded by an ele¬ vated cutaneous border, and nearly as large as the eye. Rictus of the jaws gaping in the middle, owing to the length of the teeth; nasal teeth, five long ones anteriorly, followed by three or four smaller ones; in the second row three long moveable teeth standing near the corner of the eye ; nineteen greater and smaller palatine teeth, with six more acicular ones in an interior row; on the mesial line of the nasal, three long moveable teeth ; on the vomer, two short conical ones; mandibular teeth, twenty-two small ones in the exterior row, and five long ones in an interior row. One species. The teeth are shown by figure 58. Genus IV. Eurymictera, Kaup. Fore-nostril tube projecting outwards beyond the lip; lips expanding on the upper and under jaws; hinder nostril over the eye, and encompassed by an infundi- buliform border. Nasal teeth eleven, with five small intercalary ones in the posterior part of the row; palatines thirty in the outer row, five larger ones forming an inner row; from seven to ten on the vomer, the extreme ones minute; mandibulars twenty-seven of a side, with five bigger ones near the symphysis in a second row. Body slim. Jaws deeply cleft. Dorsal fin commencing at the oc¬ ciput. One species. Genus V. Enchelycore, Kaup. Jaws incapable of shutting close from the length of the teeth; hinder nostril strikingly large, longer than broad, and situated before the eye; fore nostril-tube so unusually short that it does not pass over the edge of the lip, and it has no lid; eye in the middle of the length of the snout; the thin outstretched upper jaw curves upwards. Twenty-four slender teeth, some of them elongated, forming the outer row on the nasal bone; eight moveable latter ones in a second row; three on the mesial line; eighteen outer palatines; three moveable bigger ones making an inner row; about fifteen small, pointed vomerines, and thirty- seven fine mandibular ones, with two bigger moveable ones at the symphysis. One species. Genus VI. Thyrsoidea, Kaup. Murcence in the construction of the fore and hinder nostrils, and presenting no prominent cha¬ racter whereby they may be distinguished from the Murcence proper, except that they possess a more or less complete second or inner row of pointed palatine teeth. The numerous species (33) may be grouped according to the number of rows of their vomerine and palatine, and by the patterns which the colours of their bodies assume;—some are reticulated others spotted, others again of one uniform colour in the upper, or both above and below. Genus VII. Limamurajna, Kaup. Abbreviated Thyrsodeince, whose hind nostril-tubes project still more than those of Muroma helena. Ten or twelve nasal teeth, with some scarcely perceptible ones at their bases : three on the mesial line; palatine teeth biserial but the inner row of six generally defective, sometimes altogether wanting; four to six vomerine teeth; mandibulars uniserial, nine of them taller than the fourteen others. Head elongated; snout pointed; front nostril-tubes projecting over the edge of the lip; hinder ones a little exceeding the dia¬ meter of the eye in length. Dorsal fin commencing at the occiput. One species. r Genus VIII. Polyuranodon, Kaup. Thyrsodeinm, with three rows of acute teeth on the palatine bones; fourteen uniserial nasal teeth; five or six uniserial vomerine teeth, mandibulars quadri- serial anteriorly, biserial towards the corner of the mouth. One species. 232 ICHTHYOLOGY. Classifica- Genus IX. Channomuk^sna, Rich. (Tchthyophis seu Netta- tion—Ma- stoma, Rich., olim.) Nostrils like Murama; face short and de- lacopteri. pressed, but the gape of the mouth extremely wide and long. v j Body cylindrical, without any vestige of the fold of the skin which contains the dorsal rays in Murcena. Tail compressed and thinner at the tip, where a few caudal rays are faintly perceptible. Teeth slenderly subulate, in broad, dense, coarsely villiform plates. One species. It is represented by figure 6. Genus X. Muiuenoblenna, Lacep. (Ichthyophis, Less., Rich. partim.) Finless, like Gymnomurcena, but differing wholly in the teeth which are slenderly subulate, rather tall, and thinly set. Vo- merines irregularly biserial ; nasals, palatines and mandibulars tri¬ serial. Genus XI. Pcecilophis, Kaup. Muraenae, with blunt or more conical teeth; vomerines round, pavement-like. Hinder nostrils fringed; front ones shortly tubular, not projecting over the lip. Dorsal and anal fins not distinctly perceptible, and the species are therefore to be distinguished from Gymnomurcena by the numerous rows of vomerine teeth. Six species, most of which are much spotted. Genus XII. Gymnomur^na, LacSp. Destitute of fins ; blunt, pavement-like teeth on the border and mesial line of the nasal bone, crowded into a space shaped like the sole of a shoe. Pala¬ tine bones rudimentary, supporting small teeth in two or three rows. Body elongated, crossed by white bands. Two species. Genus XIII. Apthalmichthys, Kaup. Resembling J/orinyua, but destitute of fins except at the point of the tail, where there is a trace of rays. Eyes covered by the skin. Lower jaw thick and pro¬ jecting beyond the snout. Nostrils short and tubular, the posterior ones capable of being shut. Tail nearly equally thick throughout. Eleven teeth in the upper jaw, the seven nasals being the longest; five vomerines in one row; ten or twelve mandibulars. One species. Genus XIV. Uropterygius, Hupp. Both jaws furnished with two rows of fine teeth; the teeth in the outer row being short, with reflexed points, those of the inner ones straighter and twice as high; vomerine teeth uniserial, recurved. The only fin is the cau¬ dal, seated on the dilating tip of the tail. One species. Genus XV. Apterichthys, Dum. (Ccecilia, Lacep.; Sphage- branchus, Bloch, Cuv.) No fins. Snout lengthened beyond the mandible; gill-openings near to one another, as in Sphagebran- chus; anterior and posterior nostrils tubular. Body much elon¬ gated; tail slender. Teeth acicular and curved, and uniserial on all the dentiferous bones. One species. Genus XVI. Prymnothonus, Rich. Founded on a pencil draw¬ ing of Dr Hooker’s; has an acute snout, projecting a little be¬ yond the mandible. Acute subulate uniserial teeth, not closely set. Anal aperture near the head, a long even anal with some rays shown posteriorly united to a radiated caudal; a short dorsal fold also united to the caudal. Gill-openings lateral, a small hole in the axilla of what seems to be a small pectoral. No specimen of this form has reached England. It appears to belong to this place. Genus XVII. Moringua, Gray. Greatly elongated Muroence, with the mandible longer than the snout. Teeth distinct, acute, and recurved; vomerines uniserial. The dorsal and anal fins commence posterior to the anus, and disappear in the middle of their length, reappearing and becoming higher than before at the end of the tail. Three species. Family III.—ANGUILLIDiE. Teeth card-like or villiform. Gill-openings lateral. Pectoral fins conspicuous; anal and dorsal fins encompassing the tip of the tail, the former beginning generally at a considerable distance from the head; longish oval cycloid scales lying embedded in transverse and oblique groups in the skin, so as to resemble lattice-work. No species have as yet been detected that want the pectoral fins, like the abrachial genera among the MurcenidcB and Synbranchidw. The Anguillidoe are wholly or mostly anadromous fishes, some of them remaining always in fresh water. Genus I. Anguilla. Forty-five species. Family IV.—CONGERIDA3, Kaup. A dorsal fin reaching up to the occiput; a naked, scaleless skin ; and, for the most part, a very long tail running to a point. Pec¬ torals in some present, in others wanting; a cartilage in the lips. Genus L Mur.enesox, M‘Clell. Snout elongated like that of a Gavial, whereof the dilated spoon-shaped nasal bone over¬ passes the mandible; the thin lips do not cover the front teeth. Fore nostrils opening by short tubes near the narrowing of the nasal bone ; hinder ones often pretty remote from them, placed beneath the eyes. The large eyes placed nearly over the middle of the jaws. Dorsal fin extending forwards to the base of the pec¬ torals; vomer elevated with a furrow in which the bigger teeth stand, and are accompanied by a row of small blunt ones. Sun¬ dry rows of teeth on the palatine and mandibular bones; the Classificn- longest teeth are on the nasal bone and fore part of the mandible. t;on jqa Genus II. Conger, Cuv. Anterior nostrils opening by short lacopteri tubes close to the end of the snout; posterior ones before the large y eyes. Palatine and vomerine teeth slender, but having chisel- ” shaped crowns, and arranged in so close a series as to produce an incisorial edge. Nine species. Genus III. Congermur^ena, Kaup. Posterior nostril a short longitudinal slit before and above the large eye, which is over the corner of the mouth. Teeth flatly rounded in a multitude of rows. Species three. Genus IV. Uroconger, Kaup. Anterior nostril not tubular; posterior ones close before the eye like a small slit. A row of slit¬ like pores on the border of the upper lip. Tail much elongated, slen¬ der towards the end, and tapering to an acute point. Teeth (like those of Myras') very fine, and disposed in two or three rows ; nasal and palatine teeth in two rows; front upper jaw teeth boring through the lips; pectoral small and elongated. Gill-openings very large, as compared with those of other genera in this family. One species. Section B.'—Cryptomycteres. The olfactory canal, running from the front nostril backwards through the soft parts to the side of the mouth, opens by the pos¬ terior nostril in the white integument within the border of the lip ; in this respect resembling Lepidosiren. Family V.—OPHISURID^E, Kaup. (a.) sub-family.—ophisurinje. Tail ending in a conical point, that separates the ends of the ver¬ tical fins; no caudal fin. Genus I. Leiuranus, Bleek. No vomerine teeth) uniserial palatine teeth ranged in a crescent; mandibulars also uniserial; upper jaw elongated like that of a shark ; mandible extraordinarily short and round. Fore nostrils under the projecting snout; hinder ones in the lip beneath the eye, which is nearer the corner of the mouth than to the point of the snout. Pectoral fins scarcely per¬ ceptible. Point of the tail spinous. One species. Genus II. Centrurophis, Kaup. Vomerine teeth uniserial or sometimes sub-biserial; nasal teeth beyond the point of the man¬ dible. Pectoral fins pretty well developed. Six species. Genus III. Pcecilophis, Kaup. Three nasal teeth, not im¬ planted out of reach of the mandible ; three on the mesial line, the foremost two smaller and side by side. Eleven palatine teeth in a crescent, whose point touches the last of the mesial nasals; eleven vomerines ; nineteen mandibulars ; teeth generally pointed, short, and recurved. No cuticular processes on the upper lip. Head roundish. Pectoral fins very short; dorsal commencing opposite their bases. One species. Genus IV. Microdonophis, Kaup. Very small pointed teeth, biserial on the nasal and on the symphysial extremity of the man¬ dible. Fins much developed. One species. Genus V. Ccecilophis, Kaup. Biserial teeth near the symphysis of the mandible, and not elsewhere. Pectoral fins developed and longer than the rictus of the mouth. Fore nostrils shortly tubular, with a short tag on their under border. Dorsal fin commencing over the points of the pectorals. One species. Genus VI. Ophisurus, Kaup. Head small; snout slender and elongated, its point passing beyond the mandible; gape of the mouth very wide; eyes near the corner of the mouth; fore nostril in the middle between the eye and end of the snout, indistinct and without a tube; and the hinder one rather on the outside of the thin lip. The pectoral fin is about half as long as the mouth. Nasal teeth, five on the border of the bone, and nine longer ones on the mesial line ; thirteen short and pointed ones on the vomer; palatine teeth uniserial, anteriorly, becoming biserial under the eye. One species. Genus VII. Herpetoichthys, Kaup. Jaws nearly of equal length; snout bluntish; gape wide; eyes approximating to the snout; head depressed, so that the eyes are rather more on the dorsal than lateral aspect; front nostril-tubes at the end of the snout, and the hinder ones at the commencement of the outer row of palatine teeth ; between the two there is a small cutaneous flap on the border of the lip. Pectoral fins pretty short. Six nasal teeth; from nine to thirteen vomerine ones. Three species. Genus VIII. Brachysomophis, Kaup. Eye placed at the end of the first fifth part of the length of the jaws, or one of its own diameters from the tip of the snout; fore nostril-tube extraor i- narily short; the hinder one a short tube on the inner side of the lip under the eye; gill-openings very large, and approximated to one another. Pectoral fins comparatively small. Border of the lips warty. One species, B. horridus, whose jaws are represented by figure I C H T H Y Classifica- Genus IX. Elapsopsis, Kaup. Gape of the mouth short; snout tion jia. elongated, obtuse, stretching beyond the mandible ; the short nasal lacopteri. tube wider at its external orifice than at its commencement; eye v , approximating to the corner of the mouth. Pectoral very small hut v distinctly visible. Body about equal in length to the tail. Nasal teeth reflex, four in each row, with an odd one in front; vomerine teeth irregularly uniserial; palatine teeth uniserial anteriorly, be¬ coming biserial and sub-triserial. One species. Genus X. Mystriophis, Kaup. Snout spoon-shaped, its ex¬ tremity being dilated; fore nasal-tube rudimentary, and in the middle of the rostral expansion; eyes over the middle of the jaws, and though the long head is depressed, they are more lateral than dorsal in their aspect; gill-openings large and near one another. Two species. Genus XI. Mur^nopsis, Lesueur. Head oval; snout not much elongated; hinder nostril rather on the outside of the thin lip. Pectoral as long, or somewhat longer than the long, straight rictus of the jaws. Teeth all of equal length. Three species. Genus XII. Echiopsis, Kaup. Face short; eyes high-placed; fore nostril-tubes short; jaws deeply cleft. Pectoral fins pretty short, about half the length of the oral rictus. Nasal teeth seven ; three on the mesial line being the tallest; two rows of vomerines uniting at their posterior termination, biserial palatines, interior row composed of the smallest teeth; two rows on the mandible, the outer row being the tallest. One species. Genus XIII. Scytalophis, Kaup. Teeth all nearly of a size, divergent; anterior nostril-tube distinctly visible. Pectoral pretty well developed. All the teeth biserial except the nasals. Two species. Genus XIV. Leptorhinophis, Kaup. Snout pointed; tubes of the anterior nostrils dependant; posterior nostrils situated be¬ fore the eyes on the border of the lips; eyes over the middle of the oral rictus. Pectorals developed;; anal and dorsal fin becoming higher near their terminations. Two species. Genus XV. Pisoodonophis, Kaup. Teeth all shortly conical, more or less blunt; anterior nostril-tube projecting; eye approxi¬ mating to the corner of the mouth. Pectoral more or less fully de¬ veloped. Eighteen species, some of them all of one colour, others spotted or banded. Eighteen species. Sub Order II.—APODALS WITH ARTICULATED FIN RAYS. Fig. 66. lihamphichthys Mulleri. The Gymnotid^e are apodals, but cannot be associated with the Eels in the sub-orderofSerpentiform Apodals, owing to the considerable differences of their organization. Their jaws are complete, they are furnished with ribs, and their fin rays are jointed or branched, in which respect they differ from the preceding sub-order, the chief point of agreement being the want of ventral fins. The Gymnotidce want also the dorsal; but one of the genera has a curious long ray, which commonly lies in a furrow along the top of the rounded back, glued down by mucus. It is named by German ichthyologists “ peitsche,” or “ the whip,” and is considered by Dr Kaup to be a representative of the adi¬ pose fin on the tail of the Salmonidce. One of the most curious parts of their structure is the forward position of the vent, which in most of the Rhamphichthi is before the eye ; and in these the anal begins between the gill plates, and extends along the ventral edge of the fish, while the rounded back is destitute of a fin. Examples of a similar forward posi¬ tion of the anus occurs in some other families, but they are very scarce. The Gymnotidce inhabit the rivers and fresh- VOL. XII. O L O G Y. 233 water lagoons of the warmer parts of South America, Classifica- Guiana, Surinam, Cayenne, Demerara, Guyaquil, Ecuador, t>°n—Ma- lacopteri. Fig. 67. Sternarchus Bonapartii. New Granada, and Brazils. The best known species is Gymnotus electricus, or the Electric Eel. This animal has been well described by Dr Garden of Charlestown, by John Hunter, and by Humboldt. It is remarkable for the violence of its electric shocks, which are often so powerful as to stupify a man or a horse. The researches of Hunter detected an electric organ in the posterior part of this fish consisting of four longitudinal fasciculi, which occupy one- half the thickness of the part in which they occur, and about one-third of the whole animal. The larger pair lie above, the smaller below. Each fasciculus is composed of flat partitions or septa, with transverse divisions between them. The outer edge of the septa appear in nearly parallel lines in the direction of the longitudinal axis of the body, and consist of thin membranes, which are easily torn; they serve the same purpose as the columns in the analogous organ of the Torpedo, making the walls or abutments for the perpendicular and transverse dissepiments, which are exceedingly numerous, and so closely aggregated as to seem almost in contact. The minute prismatic cells, intercepted between these two sorts of plates, contain a gelatinous mat¬ ter ; the septa are about one-thirtieth of an inch from each other, and one inch in length contains a series of 240 cells, giving an enormous surface to the electric organs. The whole apparatus is abundantly supplied with nerves from the myelon ; and these nerves are seen coming out in pairs from between the vertebrae. In their course they give out branches to the muscles of the back, and to the skin of the animal. In the Gymnote, as in the Torpedo, the nerves supplying the electric organs are much larger than those bestowed on any part for the purposes of sensation or movement. Hunter thinks, however, that these nerves are more considerable in point of size in the Torpedo than in the Gymnote. These organs are attached loosely to the muscles of the back which lie between the larger fasciculi, and they are immediately connected with the skin by a loose cellular texture. Humboldt has given a very interest¬ ing and lively description of the mode of capturing the elec¬ tric Gymnote, as practised in South America, near the town of Calabozo. These fish abound in the stagnant pools of that vicinity. The Indians are well aware of the danger of encountering the Gymnote when its powers are unexhausted. They therefore collect twenty or thirty wild horses, force them into the pools, and when the fish have exhausted their electric batteries on the poor horses, they are laid hold of without difficulty. The horses at first exhibit much agita¬ tion and terror ; they are prevented leaving the pool by an inclosing band of Indians, who goad them with bamboos whenever they attempt to escape. “ The Eels,” says Hum¬ boldt, “ stunned and confused by the noise of the horses, defended themselves by reiterated discharges of their elec¬ tric batteries. For some time they seemed likely to gain 2 G 234 ICHTHYOLOGY. Classifica- the victory over the horses and mules; these were seen in tion Ma- every direction, stunned by the frequency and force of the lacopteri. shocks? to disappear under water. Some horses, however, rose again, and, in spite of the active vigilance of the In¬ dians, gained the shore, exhausted with fatigue; and their limbs being benumbed by the electric explosions, they stretched themselves out upon the ground.” “ I remember the superb picture of a horse entering a cavern, and terri¬ fied at the sight of a lion. The expression of terror is not there stronger than what we witnessed in this unequal con¬ flict. In less than five minutes two horses were already drowned. The Eel, more than five feet long, glides under the belly of the horse or mule ; it then makes a discharge from the whole extent of its electric organs, which at once attacks the heart, the viscera, and especially the gastric plexus of nerves.” “ After this commencement, I was afraid that the sport might end very tragically. But the Indians assured us that the fishing would soon be finished, and that nothing is to be dreaded but the first assault of the Gymnotus. In fact, whether the galvanic electricity is ac¬ cumulated in repose, or the electric organ ceases to perform its functions when fatigued by too long-continued use, the Eels, after a time, resemble discharged batteries. Their muscular motion is still equally active, but they no longer have the power of giving energetic shocks. When the combat had lasted a quarter of an hour, the mules and horses appeared less affrighted; they no longer bristled up the mane, and the eye was less expressive of suffering and of terror. They no longer were seen to fall backwards ; and the Gymnotes, swimming with the body half out of the water, and now flying from the horses instead of attacking them, began themselves in their turn to approach the shore.” The electric Gymnote is by no means fierce or voracious; but its electric organs are the instruments by which it pro¬ cures its prey, and defends itself against alligators and other enemies. It has been several times brought alive to Europe, and some experiments have been made on its electricity, which is conducted and insulated by the same substances as common galvanism. So common is the Gymnotus in some parts of South America, that, in the neighbourhood of Uritucu, a route at one time much frequented has been entirely abandoned, in consequence of the necessity of ford¬ ing a stream, in which many mules were killed every year by these subaqueous electric shocks. The genus Sternarchus of Schneider was so denominated from the anus being near the sternum. The Gymnarchus niloticus is named in Arabic “ Del e far.” Sub-Order II.—APODES ARTHROPTERYGII. Dr Kaup, for the reason stated in the text, has separated Gym~ notus from the Serpentiform Apodals, and associated it with Ster¬ narchus and its allies, forming a group placed by him next the Malacopteri abdominales, but the want of ventrals necessitates its separation as a sub-order. Family I.—GYMNOTIDJE. Eel-like, the back round, and without fins; pectorals; largely developed anal fin, extending either to the point of the tail, or leav¬ ing the extremity free; with or without teeth on the pre-maxil- laries, mandible, and palatines; no teeth on the vomer; scapular arch attached to the head ; from the fifth vertebra onwards distinct ribs encompass the belly, and in many species are perceptible through the skin; stomach caecal; pancreatic caeca ; ovisacs pouch¬ shaped, and their outlets diiFerent from those of the Eels; vent and the genital papilla behind it on the coracoid bone, or still farther forward towards the middle of the mandible. The small fore-bladder under the second, third, and fourth ver¬ tebrae is pyriform or heart-shaped, and is double; the outer one being thick, white, and easily torn; the inner one transparent, filled with a gelatinous fluid, and swimming loose in the outer one. This bladder is attached to the acoustic bones of the skull, and is connected by a fine chord with the simple posterior or ordinary swim-bladder, which chord divides, and with its fellow is attached to the stomach. The anterior double-bladder closely resembles that of the Catastomi (which is followed by two or three ordinary Classifica- swim-bladders), belongs to the organ of hearing, and corresponds tion Ma¬ to the membranous labyrinth of the higher mollusks. lacopteri Genus I. Gymnotus, Linn. Skin entirely soft, and destitute of \ \ scales. Only one species is known, which resembles Carapus in the v conformation of the head, position of the nostrils, and dentition; but the anal jin reaches the point of the tail. Head oval, flatly de¬ pressed; mouth not opening quite as far as under the eyes, fur¬ nished with broad lips of equal length ; fore nostril a small tube in a bell-shaped superficial depression above and towards the end of the lateral lip; hinder nostril distant about the diameter of the eye from the first one, behind and above it. Longitudinal and trans¬ verse rows of pores in cup-shaped depressions on the top of the head ; also a row on the mandible; lateral line indicated by a row of distant pores. About fifty pointed teeth on the upper jaw, and sixty on the under one ; a second row behind the middle of the upper ones of about six teeth ; along the symphysis of the mandible two short rows, each with twotoothlets. Vomer, roof of the mouth, and tongue furnished with lateral, projecting, dentated membranous edgings. Vent be¬ fore the gill-openings; behind it a small orifice and a small, slen¬ der papilla. Pectorals and anal fin enveloped in a thick skin which conceals the rays. One species. Genus II. Oarapus, Miill. and Trosch. (Carapus, Guv.partim.) Broad, depressed, flattish snout; a row of pointed teeth; scales. No caudal fin. Fore nostril a short tube in a notch near the corner of the mouth; hinder one before the eye, open and distinct; eyes shining through the skin ; five broad, flat branchiostegals; anal fin extending almost to the end of the tail; under lip longer than the upper one. Scales of the back and lateral line of equal size. Two species. Genus III. Sternopygus, Miill. and Trosch. Card-like teeth in numerous rows ; small mouth. Body and head compressed; head short; small jaws; occasionally traces of card-like palatine teeth. Tail slenderly prolonged, without a caudal fin. Scales of the lateral line mostly larger than the others. This genus has the aspect of a Fierasfer, Four species. Fig. 68. Rhamphichthys Artedi. Genus IV. Rhamphichthys, Mull, and Trosch. A small mouth; no teeth; snout more or less tubularly elongated, and provided with small pores; nostrils not tubular. Head and body compressed, and with an exception scaly. Anal fin long, but leaving the end of the tail free. The species divide themselves into two groups :— 1. Snout short; largely developed genital papilla. Anus behind the third part of the head ; and anal fin commencing at the point of the pectoral. Two species. 2. Anus under or before the eye, and the anal commencing before the gill-opening. Seven species. Genus V. Sternarchus, Schneid. Having a small normally formed caudal fin. A crowd of teeth on the pre-maxillaries, and two rows of recurved ones on the mandible; no tooth on the sym¬ physis. Head and body laterally compressed, the former naked, the latter scaly. In the middle of the dorsal surface of the tail an elas¬ tic ray, which, in the living fish, lies in a furrow and is kept firmly there by the dermal mucus (this ray is homologous with the fleshy fin of the Salmonidce) ; anus before or under the eye ; eye shining through without a lid. Nostrils like small pores. Four branchi¬ ostegals in the gill membrane. Three species. ICHTHYOLOGY. Classifica¬ tion—Ma- iacopteri. Sub-Order III.—MALACOPTEROUS ABDOMINALS. CLUPEOIDS OR HERRING FAM.LY. The species of this family are so numerous, and many of them are so much alike, that much confusion prevailed respecting those described by the older authors and the many nominal ones recently introduced into our lists by modern ichthyologists who were not in circumstances that enabled them, to profit by the examination of specimens preserved in rich museums. M. Valenciennes has thrown a flood of light into the darkness that previously existed; and it is on his labours that we almost solely rely in our notices of the families described in the Histoire des Poissons subsequent to the death of his illustrious predecessor’ Baron Cuvier. He has made use of the varieties of den¬ tition, so great in this family, to characterize his groups • also of the position of the ventrals and of the length of the anal, d he comparative length of the mandible has also been taken into consideration by him ; in most it projects beyond the snout; a second group is characterized by the snout, owino- to the elongation of the nasal, projecting beyond the pre¬ max illaries ; which, then, instead of crossing the upper edge of the orifice of the mouth transversely, descend on the sides. In some, the maxillary is prolonged far beyond the corner of the mouth. I here are diversities also in the fins : in ceitain species the anal and caudal are united; and in some, a greater or smaller number of the rays of the pec¬ toral are prolonged into slender-jointed filaments; others again have the anal and caudal united, while the form of the mouth varies. We can notice only a few of the species of this family. Clupea harengus, Lin. (The Herring.) The investiga¬ tion of the habits of this fish has not received that attention which its importance as an article of food to the inhabitants of this country demands; and there are several circum¬ stances respecting its economy which still require farther examination. It is generally believed that the Herrino- in¬ habits, in winter, the depths of the Arctic Ocean, or other seas in northern latitudes, and that during the rest of the year it .makes migrations southwards. In summer and autumn it appears on the north and west coasts of Europe in immense shoals, and about the same season it arrives at some parts of the coast of America and Asia. It has been supposed that those coming from the north divide into two detachments, one of which proceeds along Newfound- Hnd to America, the other along Norway to the south of Europe ; and that one subdivision of this second detach¬ ment goes up the Baltic, while the other proceeds along Great Britain, Ireland, Germany, and France, as far as the western coast of Spain. This is the description of the annual migrations of the Herring given by Pennant; but some doubts have been en¬ tertained as to its accuracy, from the circumstances,—\st, That while in some places the Herrings do not make their appearance for years, in others they are taken in abundance all the year round; and, 2d, That they have never been observed on their return northwards. Other naturalists suppose that they come merely from the deep into shallow water during the spawning season, and that in so doing they do not make any very lengthened journeys. In truth, we are not as yet furnished with sufficient data to decide the question; but, in the meantime, we do not feel in¬ clined entirely to reject the generally received opinion, that the Herrings migrate from north to south in summer and autumn. In migrating, the Herrings proceed in vast troops,—so great, indeed, that the sea is sometimes covered with them for miles, and that they have even been known to be stranded or crushed in immense quantities in confined bays, or when thrown by the wind or by currents upon 235 the shore. The shoals are said to be generally preceded Classifica- sometimes for days, by one or two males. The largest tion—Ma* generally go first, to act in some measure as guides; 'and IacoPtei,i- as they proceed onwards, immense numbers fall an easy and unresisting prey to rapacious birds, or to their own not less rapacious kindred of the sea. It is generally believed that the Herrings captured far north are larger, fatter, and of a better quality than those °f the south ; and for this reason, in the month of July, our fishermen go out to meet the shoals as far as Orkney and Shetland. The greatest number are taken on the coasts of Norway and Sweden, in the first of which countries it is said that about 400 millions are taken in one year, and sometimes 20 millions in a single fishery. The inhabitants in the neighbourhood of Gothenburg, in Sweden, take as many as 700 millions in a year. Herrings are fished also in great quantity in this country, Germany, France, Hol¬ land, the United States, and Kamtschatka. The average size of the Herring is stated to be about ten inches. According to Dr Knox, the females are consider¬ ably larger than the males; the largest female he found on the east coast of Scotland measuring eleven inches, the largest male nine inches and a half. It does not appear to be precisely known at what age they attain their full size. Considerable doubt has at all times prevailed regarding the food of the Herring. They were generally stated to live on small crabs and fishes, and on a minute crustaceous animal named by Fabricius Astacus harengum. But this was chiefly matter of supposition ; for most practical fisher¬ men described the stomach of the fish when in good state as quite empty, or, at most, as containing a little brownish mucus ; and it has appeared difficult to reconcile the fact, that it is when the stomach appears thus empty that the fish is in its best condition, viz., fullest, with the finest fla¬ vour, and most capable of keeping,—with the notion, that when it appears upon our coasts it has quitted its natural feeding ground, and has been longer and longer in a state of starvation the more southern the latitude in which it is found. Dr Knox’s interesting observation, that the prin¬ cipal food of the Salmon and Vendace consisted of minute crustaceous animals, led him to examine carefully with the microscope the brownish matter contained in the alleged empty stomachs of the Herring; and he then formed the opinion, that this matter consisted of the debris of a very minute entomostracous animal. It is well known that the Herrings caught upon the east coast of Scotland are much inferior to those taken on the west coast, and more particularly to those of Loch Fine, and other lochs of Argyleshire. Dr Knox states that the Herrings taken near the Firth of Forth in July are foul, or are engaged in spawning, while those of the west coast, in the same season, have the organs of reproduction very slightly developed; and he conjectures that that species of crustaceous animal which forms their appropriate and most favourite food may exist abundantly in the bays on the west coast of Scotland, and either not at all, or not in sufficient quantities, along our eastern coasts It appears to be chiefly after these fishes have been absent for some time from their proper feeding places that they eat marine worms and small fishes; and when so feeding, they lose much of their flavour, and run rapidly into putrefaction after being captured. 1 he time of spawning seems to vary consideiably, both in the same and in different districts; so that we may have spring, summer, and autumn herrings, as we know they have in some parts of the Baltic. Dur¬ ing the spawning season they are seen to rub their bellies against the rocks or sand. As many as 68,606 e<^gs have been counted in one female. The young do not accom¬ pany the larger herrings in their migrations. M. Valen¬ ciennes, after reviewing many facts collected by different ooservers, comes to the conclusion that the Herrings are 236 I C H T H Y ciassifica- not nice in their selection of a spawning place, depositing tion—Ma- their eggs at the bottom of the sea, sometimes on sand, lacopteri. sometimes on naked rocks, occasionally in sub-marine ^ ^ v meadows, in the eddies of currents, at the mouths of rivers, or in the sea far from the shore where the water is tranquil. They change their places of resort, occasionally wholly de¬ serting then- former haunts. For a full account of what is known of the economy and habits of the Herring and its fisheries, we must refer to the Histoire des Poissons (Cuv. and Valen.), vol. xx., and to the article on Fisheries in this Encyclopaedia. The Herring fishery of France, carried on by the inhabitants of Normandy, dates as far back as a.d. 1030, according to documents still preserved. That of Eng¬ land has been traced to a still higher date ; it is named in the records of the Monastery of Evesham as a source of revenue in 709 a.d. ; and in the annals of the Monastery of Bark¬ ing, the tax levied upon it is called Herring-silver. In Ice¬ land the Herring fishery seems to have been so important at an early age, that the word sild (Herring) enters into the composition of the names of many mountains in that island. Harengula sprattus, Valenc., is the Sprat, so abundant on the English coasts at certain seasons, and from its cheap¬ ness is an aliment that serves to vary the diet of the poorer classes. It is the Sprcette-sild of the Danes, many of whose sea-terms and names of fish and implements for fishing, have been preserved with slight alteration in the north of Eng¬ land and Scottish lowlands. A second species is named Blanquette by the French in the Mediterranean, and is so like the Sprat that most ichthyologists have confounded the two. Rogenia alba, Valenc., is the renowned “ White- bait” with which our ministry always regale themselves after winding up their parliamentary labours for the session. Mr Yarrell’s able account of it exhausts its history, and need only be referred to here. Alausa vulgaris, L’Alose of the French, and the Shad of the English. Ausonius of Bor¬ deaux, who flourished a.d. 380, in his poem on the Moselle, mentions the Shad as the food of the common people— “ Stridentesque focis opsonia plebis alausas.” Alausa pilchardus, the Pilchard so plentifully caught in its season on the Devonshire coast, and consumed by the inhabitants of that county in pies, in which the heads of the fish protrude through the crust, to denote the nature of the contents. It is the Sardinia of the Spanish peninsula and Mediterranean Sea, and the Ceilan of the French fisher¬ men. Its fishery is important to the inhabitants of the south of England, Brittany, Portugal, and Gallicia. At St Yves in Cornwall, 250,000 have been caught in a single draught, and few who have visited Lisbon but must have admired the fleets of sharp-built latine-sailed boats, named “Bean-cods,” issuing from the Tagus, to carry on a fishery so invaluable to a Roman Catholic population. Engraulis encrasicholus, the Anchovy, is another cele¬ brated member of this family, very plentiful in the Mediter¬ ranean, and found on the coasts of Greenland, Jutland, and the Baltic; it is occasionally caught in the Irish Channel, but is rare on the English side of the British Channel, though it has been taken, according to Mr Yarrell, on the Hampshire coast, and on Dagenham Breach below Black- wall. Formerly it was more abundant in the British seas, and several acts of parliament passed in the reign of Wil¬ liam and Mary regulated its fisheries. It was also a century ago plentiful on the coasts of Brittany, though by no means so now. Under the head of Fisheries the statistics of the deep- sea fisheries of Great Britain are fully entered into, and their great importance as a branch of national industry shown in detail. There are, however, wide fields for the employment of British capital in the East, where the supplies are inex¬ haustible, and the demand in the China and other markets exceedingly great. Coilia Playfairi is represented by fig. 17. The Alausa toli (Cuv. and Val.) is the subject of a 0 L 0 G Y. very extensive fishery on the coast of Sumatra, for the sake Classifica- of its roes, which are salted and exported to China, the dried tion—Ma- fishes themselves being sent into the interior of Sumatra. lac°pteri. The fish is named “ Trubu” in the Malay tongue, is about 18 inches long, and between fourteen and fifteen millions are caught annually with very rude tackle. Another of the Herring tribe, the Engraulis Brownii, is exceedingly numerous at all seasons in the Straits of Ma¬ lacca, and at the mouths of the Ganges. From it a delicious condiment named “ Red fish” is prepared by adding vinegar made of the juice of the Cocoa palm, ginger, black pepper, and powdered red-rice to the salted fish. Dussumiera acuta and Clupeonia perforata, also members of this family, are taken at Penang, and brought to table under the deno¬ mination of “ Sardines.” They are said to have a delicate flavour; but the Meletta venenosa, which occasionally visits those seas in shoals, is poisonous, and has produced death when eaten by mistake for the “ Sardine.” The poisonous fish has red eyes. These facts are from Dr Cantor, whose work on the Malayan fishes goes more into detail. Sub-Order III.—ABDOMINALES. Family I.—HETEROPYGII. Tellkampf characterized this family from the blind fish found in the Mammoth Cave of Kentucky, Amblyopsis spelceus. It is dis¬ tinguished from the other Physostomi abdominales by the position of the vent on the throat before the ventrals, and small eyes covered with skin; it possesses no accessory gills, no adipose dor¬ sal ; a simple swim-bladder; a cascal stomach; and pancreatic casca. The very forward position of the anus occurs in other fa¬ milies, notably in Gymnotidce, also in several of the TasniotdcB, and Lophiidce. Dr Wyman, on examining the fish, could discover no ocular speck, but a pretty large optic nerve. Agassiz is inclined to consider the Amblyopsis as an aberrant form of the Cyprinida, but until he has investigated its embryology he reserves his deci¬ sion. Genus I. Amblyopsis. Characters those of the family. Genus II. Chologaster, Agassiz. Habit that of Amblyopsis, but it has eyes; it has likewise a guttural anus, but wants the ventrals wholly. There are two horn-like processes on the snout. One species, C. cornutus. Family II.—APHRODEIRID^E, Bon. This family, founded on a single species, is placed by the Prince of Canino in the order of Heteropygii, comprising Amblyopsis also. Both agree in the guttural position of the anus, but M. Valenci¬ ennes places Aphrodederus among his I’ercoids, near Pomotis. The characters of the family are those of the genus. Genus I. Aphrodederus, Lesueur. Scaly Acanthopteri, with a single dorsal on the summit of the fusiform body ; pectorals and subbrachial or abdominal ventrals ; anus before the pectorals, under the gill-openings; branchiostegals six. No spine in the ventrals ; a spinous point to the operculum, and crenatures on the suborbitar scale bones. Scales ctenoid. Stomach very small, siphonal, gut run¬ ning forward from the anal fin in a canal among the muscles of the abdomen to the anus, which opens just behind the edge of the bran- chiostegal membrane. Air-bladder large, simple, with round ends. Milts communicating with the anal opening by a long canal which follows the intestine. One species. Lake Pontchartrain. Family III. CLUPEIDiE, Valenc. Scaly fishes, without an adipose fin. Body generally elongated and very much compressed; belly thin and trenchant, frequently denticulated by the edges or points of a series of dermal bones. Scales always present on the body, but easily detached. No spinous rays in the fins ; ventral fins nearly in the middle of the body; dorsal fin always solitary; moderately long pre-maxillary bones con¬ joined with the maxillaries to form the upper border of the mouth (this character they possess in common with the Salmonidce); maxil¬ lary composed of three pieces easily separated. Gill-openings very large; rakers of the branchial arches long, and projecting towards the mouth; no accessory gills present. Ribs long, and with their epipleural spines very slender ; the latter diverg¬ ing from the parapophyses and neurapophyses of the vertebras, as well as from the ribs; points of the ribs connected with the dermal osseous scales on the edge of the belly. Stomach caecal, often fleshy ; pyloric caeca numerous and long. Ova (roe) very numerous, and, ICHTHYOLOGY. 237 Classifica- near spawning time, occupying much space in the belly, as do tion—Ma- also the male organs (melt). The air-bladder is always large, and lacopteri has a slender tube by which it communicates with the apex of the v v , csecal cone of the stomach, or in some species with the dorsal side v-™1" of the stomach or oesophagus; sometimes the air-bladder divides into two long conical processes posteriorly, but this is rare; in all, its anterior end is simple and generally pointed, and does not pass before the centre of the first spinal vertebra, nor are there any ossicles intervening between its point and the acoustic capsule, as in the Carps; neither has the air-bladder of the Clupeidoe any com¬ munication with the interior of the skull. ANALYTICAL TABLE OF THE CLUPEID^ (Dum.) Mouth large. Anal separated from the caudal. 12. f E Ventrals conspicuous 1 Ventrals none, or scarcely visible Odontognathus 14. Encrasicholtjs or Engraulis Anal coalescent with the caudal COILIA 13. Clupea 6. 10. 8. 7. 11. 15. 2. 3. 5. 4. Mouth of moderate size, or small. Teeth visible on the jaws. Teeth on all the oral bones Rogenia Teeth on the upper jaw and mandible only Teeth on the upper jaw, mandible, and | j£0WALA Teeth on the tongue only Meletta Teeth on the tongue and palatines Spratella Teeth on the tongue and pterygoids Cltjpeonia No teeth on any of the oral bones. Dorsal with all the rays connected Alausa Dorsal with one isolated ray Chatoessus No teeth on the vomer, nor jaws, but on ( r, ,, ,, , > J > l Sardinella the other bones No teeth on the vomer only. Anal short, far back Harengula Anal long. Ventrals none Pristigaster Ventrals present PellONA Genus I. Clupea, Cuv. Small pre-maxillary teeth ; crenatures on the maxillary so fine as to be discoverable rather by the touch than by the sight; fine teeth also on the symphysial portion of the mandible which projects farther forward than the upper jaw; a longitudinal band of larger teeth on the vomer ; a similar one on the tongue ; two or three very small deciduous teeth on the external edge of the palatines. Body elongated ; back rounded ; belly more or less compressed or trenchant according to the size the roe or melt has attained. Sixteen species. Genus II. Sardinella, Valenc. Teeth on the palatines, en- topterygoid, and tongue; none on the vomer, pre-maxillaries, maxillaries, or mandible. Specific characters derived from the forms of the gill-cover or other external part. Seven species. Genus III. Harengula, Valenc. Teeth on the jaws, tongue, palatines, and entopterygoids ; no vomerine teeth. Ten species. Genus IV. Pellona, Valenc. Dentition of Harengula. Body very much compressed. Ventrals before the dorsal; anal long and low; edge of the belly strongly denticulated. Pectorals pointed, their first ray strong, though jointed, and long. Sixteen species. Genus V. Pristigaster, Cuv. Apodal Pellonce. Air-bladder various : large and forked behind in some species. Four species. Genus VI. Rogenia, Valenc. Teeth on the vomer, palatines, entopterygoids, and tongue; teeth also on the jaws, but scarcely visible. Genus VII. Clupeonia, Valenc. Teeth on the tongue and en¬ topterygoids only; jaws, vomer, and palatines edentate. Five species. Genus VIII. Spratella, Valenc. Teeth on the palatines and tongue only. Two species. Genus IX. Kowala, Valenc. Teeth on the jaws and entop¬ terygoids only; none on the tongue, vomer, or palatines. Form of Spratella. Two species. Genus X. Meletta, Valenc. A rough band on the tongue; no other teeth. Ten species. Genus XI. Alausa, Valenc. Teeth on the jaws deciduous and very small; no other teeth; a notch in the upper jaw. Air- bladder simple, pointed at both ends, and not extending before the third vertebra; air duct entering the conical point of the csecal stomach. Twenty-two species. In the preceding genera the mandible is longer than the upper jaw. Genus XII. Engraulis, Valenc. Mouth large, snout pro¬ jecting. Nasal bone advancing before the jaws, concealing the small pre-maxillaries ; maxillaries slender, not prolonged behind the mouth; vomer, palatines, and entopterygoids narrow, sustaining teeth sometimes very small. Gill-openings large. The species may be divided into two groups, by the elongation of the upper ray of the pectoral, or by the absence of that character. Twenty-three species. Genus XIII. Coilia, Gray. Maxillaries large, their posterior ends passing the gill-opening. Dorsal far forward; upper rays of the pectoral prolonged into slender filaments, and divided nearly to their base. Tail generally much compressed and tapering to a point, with a long low anal united to the caudal: there is an ex¬ ception to this character in a species which has the tail abbreviated, and the caudal wide and rounded. In other respects the genus corresponds with Engraulis. Six species. Genus XIV. Odontognathus, Lac. (Gnathobolus^ohn.) Body greatly compressed ; belly trenchant and very strongly denticu¬ lated, from the throat to the anus. No ventrals; dorsal very small, far back on the tail; anal very long and low, extending to near the forked caudal; pectorals moderately long. Mouth small; mandible passing the upper jaw, which is truncated, with the small pre-max¬ illaries lying transversely; maxillaries long, wide in the middle, projecting backwards beyond the mandibular joint. Teeth on the jaws, palatines, entopterygoids, and tongue; none on the vomer. One species. Genus XV. Chatoessus, Cuv. Mouth small, edentate; pre- maxillaries small, with a medial notch which receives the sym¬ physial apex of the mandible and a fibrous lip, that runs backwards from it along the whole edge of the maxillary, the latter articulated to the nasal behind the pre-maxillaries; first branchial arch uniting above the pharynx with its fellow, and sending a curious pectinated branch forwards beneath the roof of the mouth. Body in general high, oval, and short; belly strongly denticulated. Pectorals and ventrals small; first ray of the dorsal frequently prolonged. Sto¬ mach muscular; pyloric caeca very numerous, united by cellular tissue into a glandular mass, which fills great part of the belly ; ova not inclosed in a sac, but dropping into the general cavity of the abdomen. Twelve species. Genus XVI. Amblogaster, Bleeker. Small pre-maxillaries; the maxillaries constituting most of the upper half of the mouth. Body elongated, compressed; belly rounded, without serratures. No teeth. Head naked above; eyes half covered by a membrane ; cheeks venous; five branchiostegals. Indian Ocean. SALMON FAMILY. The progress of Ichthyology in the last half century has been rapid, as might be expected of a science which had been previously greatly neglected, but whose importance was at length acknowledged. The old generic groups of fishes were first characterized as families, and afterwards having, by the discovery of new forms diverging more or less from the characters of the typical species, and having, moreover, been found in many instances, by the more correct investigations into their structure that were insti¬ tuted, to include heterogeneous assemblages, were broken up into several genera, families, or even into groups of a higher order. The genus Salmo of Artedi is an example of this. That ichthyologist included in this group all fish which have from twelve to nineteen branchiostegals, teeth on the jaws, and a dorsal standing over the ventrals, with an adipose fin on the tail. Linnaeus modified this classifi¬ cation somewhat, and at length three great families have grown out of the single genus Salmo, one including all the Salmonoids, with the cheeks or the whole head covered with scaleless integument, being the group comprised in our table under the name of Salmonidce. The Characini, a second family of fishes formerly associated with the Salmon, is characterized by the small number of its branchiostegals, a very small mouth, great variety of dentition, almost always in many rows, but rarely with any on the tongue, and with a divided air-bladder. The Scopelidtz is the third family of this stock, being distinguished from the others by the maxillaries not forming part of the orifice of the mouth. Some smaller detachments have also been made, as the Erythrinidce and Macrodons. Salmo, Cuv. The fishes which constitute this genus are of great importance, and are by far the most esteemed and valuable of all those which inhabit the fresh waters. The value of the fisheries, with the number of men en¬ gaged in them, is very great, and the expense of the mate- Classifica- tion—Ma- lacopteri. 238 ICHTHYOLOGY. Classifica- riak which are employed in the capture of one or two tion—Ma- gpecies is immense. In Britain they are mostly consumed lacopteri. in the great townS) either in a recent or prepared condition. ln the north of Europe and America numbers are salted or otherwise cured for exportation. The male fish has the nose elongated and the under-jaw hooked during the breeding season. The silvery colours chanp-e to gray and red. The species inhabit the sea and fresh waters. Some migrate at the breeding season; all spawn in shallow streams, and both sexes assist in forming the spawning bed. They inhabit Europe, Asia, and Ame¬ rica. At the commencement of the genus stands,— Salmo solar, or common Salmon, a species which like¬ wise occupies the foremost place in the estimation of both sportsman and epicure. The Salmon is a fish of great ele¬ gance, combining a form fitted alike for strength and swift¬ ness ; and its depth and thickness, while in good condition, are so proportioned to its length as at once to convey the idea of a pleasing symmetry. The body above is of a rich bluish or greenish gray, changing below to silvery, sprinkled above the lateral line with rather large sub-cruciform black spots, a few of which at the shoulders generally extend be¬ low the line. The characters which distinguish it from its British congeners are the different form of the opercular bones, which show a rounded outline to the posterior edge of the gill-covers, the longest diameter of which to the nose would be in a line through the eye, while in all the other British migratory species the same line would pass much below the eye. The black inner surface of the pectoral fin is nearly a constant mark. The tail is forked in the young state, but fills up to a nearly square outline in the adult. The common Salmon inhabits the seas around Great Britain, and extends to the north of Europe and to Asia. It generally delays entering the rivers in great numbers until the streams become somewhat swollen by rains, although in the larger rivers there may be said to be a limited daily run. When the flood has fairly mingled with, and to a certain extent has saturated the estuaries, the rush of fish is often very great, especially if there has been a continued tract of dry weather. In the latter case they col¬ lect at the mouths of rivers, and are seen and often taken in vast numbers ; but they do not then attempt an ascent, deterred perhaps by the clearness of the stream, or by some instinctive feeling that the water would yet be deficient to carry them through. As Refresh approaches, however, an increased activity may be perceived; and, as far as we can judge, the change is probably indicated by the nostrils re¬ ceiving a sense of the mixture of the waters, by means of the large ramification of nerves with which they are sup¬ plied ; and to this same sense may perhaps be attributed the singular fact of the greater proportion of Salmon return¬ ing to the very streams in which they were spawned. The fish, on entering the river, rush forward as long as the flood continues, seldom resting in their course during the time that the water continues discoloured. From ten to twenty- five miles daily is the rate, as far as can be ascertained, at Classifica- which they are supposed to travel. tion—-Ma¬ in their more lengthened courses, where the rivers are lac°pteri. deeper and the interruptions less frequent, the rate at which Salmon travel is probably more rapid. Our common kind {Salmo salar) makes its way by the Elbe into Bohemia, and through the Loire as far as the environs of Buy, in the an¬ cient Velay. We also know that it works its way up the Rhine, and visits a portion of the rivers of Switzerland, al¬ though the irresistible torrent of the Falls of Schaffhausen prevents its ingress to any part of the basin ot the great Lake of Constance. It is an entire mistake to state its oc¬ currence in the Persian Gulf, and equally absurd to say that, unrepelled by the gloomy terrors of a subterranean journey, Salmon from the Gulf, adorned by the fanciful Per- sians with rings of gold and silver, find their way into the Caspian. The non-existence of the supposed communica¬ tion, is of itself a pretty sufficient barrier, even did no other exist in the laws of nature, and were light and atmospheric air dispensable. M. Valenciennes states that it belongs not only to France, England, and Germany, but to Schleswig- Holstein, Mecklenburg, Scandinavia, Iceland, and Green¬ land. It exists also in Labrador and Canada, and down the American coast to the Connecticut River, in latitude 41^ ; and either it, or a species so nearly allied to it as not to be distinguishable except by close comparison, abounds in the Arctic Seas washing the northern shores of the American continent. It does not frequent the rivers falling into the Mediterranean, though Dr Davy informs us, on the autho¬ rity of an intelligent observer, the clerk of the market at Malta, that a stray Salmon was once caught at that island, and brought to the market for sale. During nine months residence at Constantinople Dr Davy paid frequent, almost daily visits to the well-supplied fish market of that city, but never saw either Salmon or Trouts among the great variety of other fish that were there for sale. In our lower and clearer waters, however, they travel at a much slower rate than that above alluded to—resting for some time in the pools by the way, and now and then taking a regular lie in some chosen spot, which they will return to daily as long as the river continues unfitted for their progress. Upon the least accession, however, to the water, either directly or from some swollen tributary, they are again upon the alert; and it is often felt by them several hours before the quickest or most experienced human eye can perceive a rise upon the river. Having ascended to a considerable height, they remain more sta¬ tionary, and proceed more slowly with the subsequent floods, till the spawn increases in size. This increase, it not in¬ fluenced by, is at least so connected with, the commence¬ ment of the colder weather, as then to proceed at a more rapid rate. As the spawn advances, the symmetry of the form is disfigured; the female becomes disproportionateh large, the colours lose the brightness of their silvery tints, and become dull and gray. The male becomes thin upon the back, the nose elongates, and the under jaw turns up in a large and strong hook, which enters a hollow in the nose before the pre-maxillary bones. The colours and mark¬ ings become brown and red, those on the head and gill- covers being particularly brilliant, and disposed in lines almost like the marking of a Sparus. In this full breeding dress the male and female seek some ford or shallow stream, and commence to excavate a trench or furrow (chiefly by the exertions of the female). In this the spawn is depo¬ sited, and impregnated at the same time, and finally covered with gravel by the exertions of the fish. The furrow is generally from six to nine inches in depth ; and when the spawn has appeared to be covered beyond that depth, this has occurred from some other circumstances—such as the stream or floods having carried downward additional masses of gravel, &c. After this great effort has been accomplished, I C H T H Y Classifica- both sexes are reduced to a state of remarkable emaciation. tkm—Ma- The elongated nose, and hooked jaw, and brilliant colours" lacopteri. are almost immediately lost; the old scales are cast, and the fish retire to some pool to regain their strength’ and complete their new clothing. They finally redescend to the sea by easy stages, where their former condition and silvery lustre are regained, their strength invigorated, and all their functions so repaired as to enable them ere Ion0- to renew their visit to the flowing streams, again to multiply their race. 1 J The ova continue covered by the gravel during the win¬ ter, and begin to vivify from about the end of March to the commencement of April. The fry remove from under the gravel when nearly an inch in length, with the ovum still attached; and at this period, if the spawning bed or furrow be turned up, it will appear in motion. We refer to the article Fisheries for the details of Mr Shaw’s observation.s, which prove that the young fish or Parr may remain a full year in the fresh water. On the eve 0^.1, and of large pink spots with a similar light area. ^ These extend over the gill-covers, upper fins, and often over the tail itself. A variety occurs in Loch Loyal, in Sutherland; above, purplish brown ; beneath, blackish gray; the whole body spotted over with dark sepia coloured spots, of a smaller size on the lower portions. Salmo ferox ap¬ pears to be entirely confined to the lakes, seldom ascending or descending rivers, or wandering in and out of them, and never migrating to the sea. When spawning, it ascends for a short way up the rivers or streams which run into the lakes, but never, as far as yet known, descends those which run out of them. It inhabits, among the English lakes, Ulswater; but does not there reach a size above ten or eleven pounds. In Ireland, as far as we can yet learn (specimens having not yet reached us on this side of the water), it is found in Loch Neagh and some other large lakes; and in Scotland we have taken it in Loch Awe, Loch Laggan, the upper end of Loch Shin, and Lochs Loyal and Assynt. It is a fish of remarkable ferocity, and as great an enemy to its smaller companions as the Pike. It may be taken by night lines, or by strong trolling tackle, baited with a small Trout, and will return a second and third time to the bait, even after it has been dragged for forty or fifty yards. The Salmonidce, though they take so important a place among the fresh-water fishes of Europe, are still more abundant in the northern Siberian rivers, and in the great lakes and rivers of North America. On the Pacific coast, indeed, of British North America some populous tribes of natives subsist chiefly throughout the year on the Salmon and Trout, which they take at the beginning of the spawn¬ ing season, and preserve by drying. Descriptions of some of the species are given in the Fauna Boreali Americana, and the Fauna Rossica of Pallas contains accounts of the numerous interesting Asiatic Salmonidce. The common Salmon, we have said above, frequents the Atlantic and Arctic coasts of British North America; but there is a Trout in the great lakes and interior rivers which equals the Salmon in size, and is at least equal to it in flavour and ex¬ cellence as an article of diet. This is the Salar namay- cush (Pennant), which is very commonly taken of a size varying from twenty to forty pounds, and is reported to grow to sixty and upwards, though fish of that weight are as rare as a Salmon equally heavy. The Namaycush is taken in considerable numbers for the American markets at the fisheries established on Lakes Huron and Superior for the capture of another member of the family of still greater ex¬ cellence, the Coregonus sapidus of Agassiz, or the albus of the Fauna Boreali Americana. This Coregonus, the well known “ White Fish” of the fur traders, is found in every lake and river from the United States northwards, and it descends even to the mouths of the rivers that fall into the Arctic Sea. In flavour, and all the qualities that a fish can possess as an article of food, it surpasses, we be- live, every other, whether fresh-water or marine ; and Euro¬ peans previously accustomed to a sufficient variety of diet, have lived almost solely upon it for a year or more without tiring of it. To the native population it is of vital import¬ ance, and it is only in the Buffalo prairies that they can subsist without its aid ; while to many tribes it forms the chief food. Within a few years fisheries, employing a large fleet of ships, chiefly belonging to the United Sates, have been established for the capture of this fish on Lakes Huron and Superior. Several other species of Coregonus, known locally by the name of “Herring Salmons,’’exist in the Ame¬ rican waters, but they are much inferior in quality, and re¬ semble the European species more nearly as articles of diet. Even they, however, are delicate food, and would be esteemed were they not so much surpassed by the “ White 243 Fish.” It may be remarked here that M. Agassiz, who is Classifica- now in a position to investigate the ichthyology of America tion—Ma- thoroughly, has already perceived that every lake, basin, -Lcopteri. and river system in that country possesses peculiar species of fish, though some species are common to several water¬ sheds. He found this to be the case with Lepidosteus and Coregonus ; and if his observations prove the fact in that continent, we may expect to perceive that the same law exists elsewhere, though the European lake and river sys¬ tems, being comparatively very small, it may not be so ap¬ parent with us. M. Valenciennes describes many Euro¬ pean Coregoni. Of the British species, he says that the Coregonus pollan of Thomson (Yarrell, Supp. 24) is very similar to his C. sikus, which inhabits Norway, in the vicinity of the North Cape, but that its head is smaller and its jaws more equal. The Pollan inhabits Loch Neagh, and Mr Thomson says that 17,000 were taken thereat either three or four draughts of the net in September 1834. It is a fish that is brought in quantities to Belfast market during its season. Of the Powan (Yarrell), the C. Cepedei of Parnell, he says that he has found the original descrip¬ tion of Noel de la Mariniere, on which Lacepede founded his C. clupeoides,, in which the fish is called also “ Span” or “ Pollock.” Noel had gone to Loch Lomond to see what were said to be sea Herrings naturalized in the fresh¬ water lake, and thus the species was introduced into our systems. Pallas had already used the specific name of Clupeoides for another Coregonus, and the name given by Dr Parnell will therefore remain as the scientific appella¬ tion of the fish. At Loch Lomond Shelley is one of its local names. M. Valenciennes thinks that this species has not yet been discovered on the Continent. C. Pennanti is the Welsh Gwyniad of Yarrell {Brit. Fish., ii., 85); but, according to M. Valenciennes, very different from the fera, with which Pennant confounded it, and equally so from the Lavaret of Switzerland. The specific name of Pennanti is therefore employed in the Histoire des Pois¬ sons to distinguish it. The species which inhabits Loch- maben, a piece of water that bathes the ruins of Bruce’s Castle, is locally known as the Vangis, Vendace, Ju- vangis. According to the traditions of the place, it was originally imported thither from the Continent by Queen Mary. Sir William Jardine was the first who correctly described the Lochmaben fish under the name of C. Willughhii, but recognizing at the same time its close re¬ semblance to the S. albula of Linnaeus. M. Valenciennes, by a comparison of specimens, has decided it to be in fact the albula of the Fauna Suecica, and has therefore described it under that specific name in the Histoire des Poissons. It it is the Blitka of Lake Siljan in Dalecarlia, and the Vcmme, or, when its resemblance to the Herring is referred to, the Land-sild of the inhabitants bordering on Lake Miaes. Ac¬ cording to Bloch, it exists in Silesia, Brandenbourg, Pome¬ rania, and Mecklenbourg; and M. Martens found an ex¬ tremely similar Coregonus, if not actually the same, at Kamtschatka. Artedi mentions Sih-loja and Strut as its Swedish names, Blieta as its Silesian one, and Moiku and Rapis as those by which it is known to the Fins. The Vendace of Lochmaben, whatever scientific name it may ultimately receive, is one of the most elegant of the Co¬ regoni, though of a small size, reaching from four to ten inches in length. The head is of an angular shape, and small compared with the size and depth of the body. The crown of the head is very transparent, and the form of the brain, which is heart-shaped, is seen through the integu¬ ments. This peculiarity is one of the first things pointed out to the stranger naturalist who visits Lochmaben to see this species. The eye is large and brilliant; the body rises gracefully to the back fin, and recedes with a gradual curve to the tail; the under line is nearly straight from the gills to the ventral fin. The upper parts are of a delicate greenish- 244 ICHTHYOLOGY. Classifies- brown, shading gradually into a clear silvery-white ; the tion—Ma- bn greenish-brown, the anterior edge much length- ^acop eri.^ an[j p0;nte(j . tbe lower fins all blush-white ; the tail much forked. They spawn about the commencement of November. The roe is minute and abundant, and of a bright orange colour. The flesh is white and rich, and highly prized as food ; but as it requires almost to be eaten on the spot, it is not useful as a market commodity when transmitted to any considerable distance. The lochs of Lochmaben are the only authentic British habitat for this species. The Grayling (Thymalus vulgaris) is a local fish in Eng¬ land, being chiefly found in the Test, the Avon, the Dove, the Lug, the Wye, the Irvon, the Teme, and the Gun, in the southern counties ; in the Trent, the Dove, and Dee, in the midland districts, and in the Wiske, the Wharfe, the Ure, the Kibble, and the Derwent, in the northern coun¬ ties. In America the Graylings have not been detected south of the 61st parallel of latitude, but two or more species abound in the clear affluents of the Mackenzie, issuing from granitic and other primitive rocks. One, the Thymalus signifer, is the most beautiful known species; and the Es¬ kimos, seizing on its most characteristic feature, name it “ Heivlukpowak” or the “fish with the wing-like fin.” It affords fine sport to the angler, tugging like a bull-dog when it feels the hook. Stenodus Mackenzie, the poisson inconnu of the canoe- men who accompanied Mackenzie in his voyage down the great river which bears his name, is still so called by the fur-traders who frequent the district. It ascends the Mac¬ kenzie from the Arctic Sea as high as Great Slave Lake, a course of 500 miles, but shuns clear water, and has not hitherto been discovered in any other river than the Mac¬ kenzie. M. Valenciennes, having seen no specimen, has not introduced it into his great work, but it is nevertheless a very distinct generic form, not liable to be confounded with any other. When obtained soon after its ascent from the Arctic Sea it is agreeable food, but people who feed solely on it tire of it sooner than either of the “ Namaycush” or “ White Fish and after it has been for some time in fresh water its flesh becomes soft and oily. Its weight varies from five to fifteen pounds, but it has been taken of a considerably greater size. The preceding pages contain as full an account as our limits will permit of the typical Salmonidce with fleshy cheeks, and, on account of their importance to man, and the general interest felt in their history, we have devoted more space to them than we can give to other groups of fishes. M. Valenciennes has separated the Salmonoids which have the cheeks cuirassed by an enlargement of the sub-orbitar scale bones so as to cover, in great part or wholly, the muscles which move the mandible. These present a great va¬ riety of forms, which he has subdivided into lesser as¬ semblages of genera. The Characini and Scopelini of Muller nearly comprehend this division, but the group is not exactly the same. Some of the genera belonging to this division, and named in the table, are vegetable eaters, and have long intestines doubled up in the belly; others are fierce devourers of flesh. Some of the most curious, from their habits, live in the great rivers of South America. The Myletes paca, of Humboldt is said to be a fish of exquisite flavour, but with its flesh full of ribs. It is an inhabitant of the Amazon and its affluents. The species of Serrosalmus, so voracious and so expert in carrying away a mouthful of flesh, bitten off with their cutting teeth, are dreaded by the natives of the districts in which they abound. Any animal falling into the water is immediately attacked and cut in pieces by swarms of these fish. Known to the Indians by the names of Caribe or Caribito, on account of their thirst for blood, they assail bathers the instant they plunge into the water, and inflict dangerous wounds before the sufferers Classifica- are able to escape. Their haunt is at the bottoms of the tion—Ma- rivers, but a single drop of blood thrown into the water will lacopteri. bring them in thousands to the surface. A very curious white and translucent fish is the Salanx JReevesii, known to the Europeans at Canton by the name of “ Whitebait,” and eaten as a delicacy, served in the same way that the fish of the same name is cooked at Blackwall. One group, the Scopolini of authors, is remarkable for the extreme metallic brilliancy of round spots, placed generally in rows along the body, or for other brilliant places about the head and elsewhere ; many are nocturnal, coming to the surface at night, and some have luminous eminences on the head visible in the dark. They abound in the Mediter¬ ranean and China seas, but they comparatively rarely appear in northern latitudes. Fig. T>. Scopelus or Myctophum boops. One species only has been detected on the British shores. The Scopelus Pennanti was first noticed by the naturalist whose name it bears, but was mistaken by him for the Atherine. It has been taken at the island of Sheppy, on the coast of Flintshire, at Exmouth, and in the Orkneys. The S. borealis (Nilss.) is a Norwegian fish, different from the British one. Fig. 24 represents a scale of Scope¬ lus resplendens, an Atlantic fish, and Chauliodus Fieldii is represented by fig. 2. Fig. 73. Saurus undosquamis. The Saureys are curious from the forms of the teeth ; in some species long, slender, and barbed at the points. The dentition of the S. nehereus (Hamilton), S. ophiodon (Cuvier), is of this kind, and on that account Lesueur pro¬ posed Harpodon as a generic name for it. It is a fish of voracious habits, and at certain seasons its body is brilliantly phosphorescent, like some of the Scopelines. It is rich food, though delicate when newly taken. When salted and dried it gets the singular appellation of “ Bombay ducks” in commerce, or of Bummaloti, and is exported in large quantities from Bombay and the Malabar coast to other parts of India. Fig. 41 shows the form of a scale from the lateral line of Saurus undosquamis (Richardson). Fig. 74. Galaxias truttaceus. The Galaxidce, though they want the adipose fin of the Trouts, yet have much the aspect of these familiar fishes, and represent them in the southern hemisphere, where no ICHTHYOLOGY. 245 Classifica- true Trouts are found. They are inhabitants of fresh water, tion—Ma- and are named “ Trouts” by the settlers of New Zealand lacopteri. ancj Australia. As an article of food they are softer and more oily than the northern Salmonoids. Family IV.—SALMONIDJE, Mull. Scaly fishes, with an adipose fin. Upper half of the orifice of the mouth formed by the pre-maxillaries and maxillaries ; numerous branchiostegals. A large, simple air-bladder, without contractions; supplementary branchiae, and numerous pyloric caeca. They pos¬ sess most of the characters of a Clupeoid that has not the acute and denticulated belly. Their teeth are often absent, or small; often all the pharyngeal bones are armed with them ; they are conical and in one row, and when they exist on the jaws and palatines the tongue also is furnished with teeth. The distribution of the vomerine teeth furnishes M. Valenciennes with generic characters for the subdivision of this most important but difficult family. (A.) Genus I. Salmo, Valenc. A few teeth at the end of the vomer, but no prolonged row on the mesial line. Body fusiform. Head moderately large ; throat well armed, often wide; pre-maxil¬ laries short, and rather on the sides of the mouth than across its upper edge; maxillaries articulated to the ends of the pre-maxil¬ laries, and not compound ; mandible strong, often with the sym¬ physis rising into a small tubercle, but in some species the tubercle is much developed. Strong conical teeth on the jaws ; a small group at the end of the vomer ; one row on the palatines, entopterygoids, and on each side of the tongue; some have two rows on the tongue. An adipose fin on the tail. Thin small scales covering the body. A short intestinal canal; a siphonal stomach ; ova, when detached from the ovary, falling into the cavity of the abdomen before they are excluded in spawning. A large air-bladder, simple, with thin coats, and opening anteriorly into the pharynx, almost directly or without the intervention of an air-tube. With the exception of the peculiarity of the vomerine dentition, many of these characters are common also to the two genera which immediately follow. Twenty-five species. Genus II. Fario, Valenc. Salmons with a single mesial line of teeth running down the vomer. Four species. Genus III. Salar, Valenc. Vomer armed with two rows of teeth, without any remarkable group on the chevron of the vomer, as in the preceding two genera. Eight species, besides about twelve doubtful ones hitherto imperfectly described. Genus IV. Osmerus, Cuv. Pre-maxillary teeth small and hooked ; vomerine teeth big, conical, and so far forward that they appear to belong to the jaws; a row on the outer edge of the pala¬ tines, and one on the internal border of the entopterygoid; big teeth also on the tongue. In other respects the Spirlings resemble the other Salmonidce. They have a small adipose fin ; ventrals situ¬ ated under the anterior rays of the dorsal. Gill-openings widely cleft; air-bladder having within silvery walls, and communicating with the upper part of the oesophagus. Four species. Genus V. Mallotus, Cuv. Mouth rather less wddely cleft than that of Osmerus, armed with very small, slender, or conical teeth in a single row on the jaws ; more numerous on the palatines and vomer; small teeth also on the tongue. Eight branchiostegals. In¬ testines of the Trouts. One species. Genus VI. Argentina, Cuv. Salmonidce, in having an adipose fin, and the upper half of the orifice of the mouth formed by the very short pre-maxillaries and the maxillaries. Mouth small; no teeth on the jaws; on the chevron of the vomer a curved band of uniform teeth, prolonged on each side by a dental stripe on the palatines ; lingual teeth of variable size in different species. Gill- openings wide; branchiostegals six. Stomach moderately large, caecal; numerous short pyloric caeca; ova falling into the abdominal cavity as in the Salmons. Air-bladder covered by a coat of silvery fibres, which tear off, and is used in the fabrication of artificial pearls. Four species. Genus VII. Thymalus, Cuv. Mouth small, the orifice horizon¬ tal under the snout; teeth small, conical, uniserial on the jaws, chevron of the vomer and fore part of the palatines. Intestines like those of Salar. Air-bladder large, communicating with the oesophagus by a very small tube. The disposition of the scales under the throat is peculiar in some species. Eight species. Genus VIII. Coregonus, Cuv. Pre-maxillaries crossing the upper part of the mouth, thin, and of variable depth; maxillaries on the sides of the mouth also thin and attached to the ends of the pre-maxillaries, generally of an oval or oblong form. Teeth small or none. Dorsal fin farther forward than the ventrals. Forty species. Agassiz retains the name of Coregonus for the species which Classifica- have the mandible shorter than the upper jaw ; and gives the name tion—Ma- of Argyrosomus to those which have it longer. lacopteri. Genus IX. Stenodus, Hich. Pre-maxillaries crossing the upper part of the mouth, giving a truncated appearance to the snout, each armed by a narrow linear-lanceolate band of small raduliform teeth ; maxillaries articulated to the palatine bones, long andbroadish, with a posterior, ovate, accessory piece as in the Coregoni, and forming the sides of the mouth; toothless; vomerine teeth in a transversely oval disk on the chevron (but not down the mesial line), uniting with the crescentic bands of teeth of the same kind on the palatines. These palatine bands have the hollow of the crescent facing the sides of the mouth, and taper to a point posteriorly. On the tongue, the teeth are rather coarser, and cover its surface. Mandible rather shorter than the upper jaw, the part opposed to the pre-maxillaries transverse with a knob at the sym¬ physis, and armed there by a very narrow band of villiform or raduliform teeth ; limbs of the bone longitudinal, with rather acute perfectly toothless edges. The whole orifice of the mouth is nearly quadrangular. In general aspect the Stenodus rather resembles a Coregonus than a Salmon, but bears no strong likeness to either. The ventrals are under the anterior part of the dorsal, and the adi¬ pose fin corresponds to the posterior half of the anal, which com¬ mences with the last third of the fish, caudal included, and does occupy above a ninth of the entire length of the fish. Branchio¬ stegals nine to eleven, often one more in number on the left side. Stomach but slightly cascal, the upward turn which ends in the pylorus being short, with the oesophagus longitudinally folded within. Pyloric caeca numerous, and crowded for an inch below the pylorus, but after the insertion of the gall-duct confined to one side of the intestinal tube; lower part of the gut furnished with valvulae conniventes. Air-bladder communicating with the oeso¬ phagus by a wide tube. Only one species known, the Stenodus Mackenzii, Richardson (Back’s Voyage down the Great Fish River in 1834 and 1835, p. 521). (B.) M. Valenciennes makes a second division of the Salmonoid fishes by grouping together those in which the sub-orbitar scale bones are large, and conceal almost the whole, or at least a great part, of the interval between the orbit and the ascending limb of the preoper¬ culum. This division includes the Charicini and Scopelinas of Muller; but from the former, M. Valenciennes separates his Erythri- nidce. Family V.—CHARACINIDAE. Char acini, J. Mull. Malacopterygian fishes with abdominal ventrals ; adipose fin ; scaly bodies ; scaleless head ; no accessory branchiae ; upper half of the orifice of the mouth formed by the pre-maxillaries and maxillaries; villiform pharyngeal teeth above and below; caecal stomach; numerous pancreatic caeca. Air- bladder divided by a transverse strangulation into two, and con¬ nected with the acoustic organs by a chain of ossicles as in the Cyprinidce and Siluridce. Branchiostegals four or five ; numerous pancreatic caeca. South American or African fluviatile fish. M. Muller includes Erythrinus and Macrodon among his Characini, but these fish want the adipose fin of the Salmon family, and are placed by M. Agassiz near the Clupeidce. M. Muller’s genera Catoprion, Myletes, Myleus, Serrasalmus, Pygocentrus, and Pygopristis, have the belly serrated. The other genera are Anodus (Curimatus Valenc.), Hemiodus, Xiphostoma, Xiphoramphus, Hydrolycus, Anosto- mus, Leporinus, Schizodon, Chilodus, Hydrocyon, Citharinus, Piabuca, (including Schizodon, Valenc.), Gasteropelecus, Epicyrtus, Raphi- odon, Pacu (Prochilodus, Agass.), Bistichodus, Exodon, Salminus, Brycon, Chalceus, Alestes, Tetragonopterus. ANALYTICAL TABLE OF THE CHAR A C1NIDAE (Dum.) Teeth, none ( Anodus, M l ( Curimatus, V. J Teeth, none on the tongue, present elsewhere in the mouth. Teeth elsewhere uniserial. Pre-maxillary teeth stronger, fnc«sj>i(L..GASTROPELECUS Pre-maxillary teeth stronger, conical with canines. Belly rounded EPICYRTUS Belly keeled Pre-maxillary teeth not stouter. Dorsal opposed to the ventrals. Pre-maxillary teeth wide, entire Leporinus Pre-maxillary teeth fissured ( PIABlCA> Part- } ( Schistodon, M. J Raphiodon, M. 1 Cynodon, V. J 14. 3. 29. 2. 8. 246 ICHTHYOLOGY. Classifica¬ tion—Ma- lacopteri. Pre-maxillary teeth narrow, f Citharinus, sp. ) „ \ Chilodus, M. J ‘' 27. 7. 8. 6. 15. 5. }21- 21. 11, 12, 13. 16. 30. round \ Chilodus, M. Pre-maxillary teeth narrow, co- 1 Hydrocyon nical J Dorsal not opposed to the ventrals. Dorsal before the anal Citharinus Dorsal above the anal Piabuca Teeth elsewhere pluriserial. Dorsal above the ventrals. Teeth feeble, slender; labial ones bi- ( Pacu serial j Prochilodus Teeth firm, fissured, biserial, Distichodus Teeth large ; anterior ones conical... j SP‘^r’ j 3. Dorsal between the ventrals and anal. Teeth conical, triserial above, biserial 1 „ below } SALMINUS Teeth flat, pointed, triserial on the f Chalceus, sp. mandible [ Brycon Teeth flat, pointed, biserial above. Belly keeled Chalceus Belly round Mandibulars uniserial { r^ETRAG0N* j lOPTERUS J Mandibulars biserial Alestes Teeth present on the tongue. Teeth on both jaws. Palatine teeth, conical, Serial; j XipH0RAMpHUg Palatine teeth granular, crowded ; ca- I Hydrolycus 29 nines j Palatine teeth none • Xiphostoma 32. Teeth on the mandible; none on the up-1 jjEMIOdus 9 per jaw J Genus I. Curimatus, Yalenc. Resembling the Graylings (Thymali) in the smallness of their mouth, and feeble dentition, often wholly absent on the jaws. Mouth toothless; jaws with trenchant edges, without lips, the superior one notched to receive a symphysial tubercle of the mandible. Ascending branch of the stomach thick and muscular. Pyloric caeca numerous (amounting to eighteen). Branchiostegals four. Species seven. Genus II. Leporinus, Spix. Body elongated; belly rounded. Mouth small; lips fleshy ; teeth few in number on the pre-maxil- laries and mandible; the mesial pair above and bblow longer than the rest and almost horizontal. Pharyngeal teeth in transverse bands; each tooth having a long laterally compressed crown, ter¬ minating in two hooked points of unequal length. Branchial aperture small, from the union of the membrane to the scapula. Branchiostegals four. Pyloric cseca from ten to eighteen. These fish are vegetable feeders. Eight species. Genus III. Epicyrtus, Mull. Conical teeth on the pre-maxil- laries and maxillaries, some of them projecting from the surface of the jaw like the canines of some Labroids (Calliodon, for instance, figure 56). Pyloric caeca, six or seven. Intestines short. Two species, which include Exodon. Genus IV. Parodon, Valenc. Teeth planted in the walls of the upper lip, moveable and slightly curved, their crowns small triangular disks with denticulated edges ; mandibular teeth on the side lips only, and not opposed to the pre-maxillary ones of the upper jaw. Four branchiostegals. One species, unknown to Muller. Genus V. Salminus, Agass. Teeth in several rows on the jaws. Body elongated like that of a Trout, and the mouth also similar, ex¬ cept that the tongue and roof of the mouth are smooth as in most Characins. Pre-maxillary teeth conical, in two rows ; one row on the maxillaries; mandibular teeth in two rows, and the interior ones remarkable for their small size, their equality, and their ob¬ lique insertion into the limbs of the jaw. Five species. a. M. Valenciennes forms a group of Prochilodus, Citharinus, Hemiodus, and Piabuca, which have the teeth curiously crenated, and no denticulated keel to the belly, but with an adipose fin, as in the other Salmonidce. Genus VI. Prochilodus, Agass. (Pacw,MiilL) Mouth small, pro¬ tractile, situated at the extremity of the head, and surrounded by very thick lips, supporting under their edges a row of excessively small teeth like hairs, which, when viewed under a lens of considerable power, are seen to have a disk at the extremity, often denticulated or crenated. Farther back towards the middle of the lips there is a second series of similar teeth in a crescent with the hollow towards the interior of the mouth. Body elongated and somewhat com¬ pressed, but dumpish like that of a Carp. Four branchiostegals. Ascending branch of the stomach fleshy, but not so much so as in Curimatus. Pyloric caeca very numerous, so as to deter one from Classifi counting them. Thirteen species. tion—M8" Genus VII. Citharinus, Cuv. (Including Chilodus, Miill.) Body lacopteri elevated, compressed, rhomboidal; mouth horizontal at the extre- ^ ^ _ri‘y mity of the head, the upper arch of the orifice almost entirely formed — v-®- by the pre-maxillaries, the maxillaries lying behind, but covering the corner of the mouth; teeth extremely small, implanted in the lips, and resembling hairs; none within the mouth. Two species, Xile. Genus VIII. Piabuca, Cuv. Salmonoids, with uniserial, tren¬ chant, and compressed teeth, denticulated on the cutting edge, im¬ planted in the lip, and very moveable, the row corresponding to the pre-maxillaries and mandible. It comprises the Schistodons of Agassiz and Muller. Three species. Genus IX. Hemiodus, Miill. Small labial teeth, implanted close to one another in a row on the upper lip; the pre-maxillary and maxillary teeth moveable to the touch like the keys of a piano. There are none on the lower lip. Each tooth is compressed, rounded in front, with denticulated crown or disk. Pre-maxillaries very small and concealed beneath the lip. Mouth very small; body elongated; belly rounded. Branchiostegals four to five. Two spe¬ cies. Genus X. Plecoglossus, Schl. Teeth on the pre-maxillary six; on each maxillary between the bone and the lip fourteen moveable ones in one row; they are somewhat compressed and pointed ; a band of card-like teeth on each palatine, and the tongue also covered with teeth; three pockets formed by a membrane attached before the tongue. Branchiostegals four. Genus XI. Tetragonopterus, Artedi. Body elevated, rhom¬ boidal or orbicular, passing in some species into oval or lengthened forms. Mouth small; two rows of teeth in the upper jaw, one in the lower one. Twenty-one species. Genus XII. Brycinus,Valenc. Separated from Tetragonopterus. Body elongated as in Chalceus) teeth crenulated and standing close as in Tetragonopterus. The interval between the two rows is greater in the upper jaw, and a distinctive character exists in the presence of a spur on the crown of the teeth, which resemble those of Chalceus, but may be readily distinguished; dorsal and anal high. Senegal. Genus XIII. Piabucina, Valenc. Separated from Tetragonop¬ terus and Piabuca, on account of a combination of characters ; body elongated like Piabuca, with fixed crenulated teeth as in Tetra¬ gonopterus, but differing from those of the latter in that the double row is on the mandible ; on the upper jaw there is only one row. One species resembling Erythrinus. Maracaibo. Genus XIV. Gasteropelecus, Pall., Gronov. Pre-maxillary teeth in two rows, tricuspid; maxillary teeth conical, much pointed, uniserial; pharyngeal teeth villiform, densely crowded. Body exces¬ sively compressed and high in the pectoral region. Dorsal far back. Gill-openings large; branchiostegals four. Scales. In¬ testine remarkably short; seven pancreatic cseca. Surinam. Genus XV. Distichodus, Mull. Teeth on both jaws in a double row; small, close together, with a slightly compressed forked crown. Body elongated and compressed, belly rounded; caudals and adipose fin scaly like the rest of the body, naked only at the border. Stomach long, ascending branch long and very muscular. Pyloric caeca numerous and elongated like small intes¬ tines, extending along one side of the duodenum. A vegetable feeder. One species, the nefasch of the Arabs. Genus XVI. Alestes, Miill. Pre-maxillary teeth in two rows, those of the exterior row having three trenchant points, while in the interior row the crowns are more obtuse; but there are some projecting points among them; no maxillary teeth; mandibular teeth biserial, the disk channelled, with crenated crowns; behind the symphysial ones, some small conical ones; pharyngeal teeth very small. Ten to fourteen pyloric caeca. Voracious insecti¬ vorous fishes. Air-bladder prolonged posteriorly on the right side of the interhsemal spines, whereas in most other fishes when the air-bladder is extended back out of the abdomen it is forked, and sends a horn on each side of these bones. Three species. Genus XVII. Myletes, Cuv. Pre-maxillary teeth having truncated crowns and standing in two rows; for the most part there are only two conical teeth in the inner row behind the sym¬ physis, but in some species there are seven. The teeth are mostly prismatic with rounded ribs, the crowns of the anterior row being slender, cutting, and feebly denticulated; in the second row the posterior edge is more elevated, and the middle somewhat pointed. Body compressed ; belly keeled and often strongly denticulated. First interneural of the dorsal lying horizontally, with its spinous point directed forwards. Intestines long; caecal stomach, with a short, thick, pyloric branch. Vegetable feeders. Seventeen species. Genus XVIII. Tometes, Valenc. A row of pre-maxillary teeth with sloping or chisel-formed cutting crowns like the hu- ICHTHYOLOGY. 247 Classifica' tion—Ma lacopteri. man incisors; behind which there is a second rank in which the teeth near symphysis have their crowns somewhat truncated, but the lateral teeth are all incisorial, the slopes of the two rows ’ being on different sides, so that they form a furrow which receives the points of the mandibular teeth. At the symjihysis of the mandible there are two interior, very small, compressed, and sharply pointed teeth. No maxillary teeth. Three species, un¬ known to Muller. Genus XIX. Myleus, Mull. Pre-maxillaries armed with two rows of teeth ; the exterior ones compressed and incisorial • the in¬ terior ones truncated like molars, but with the posterior edge ele¬ vated and cutting; mandibular teeth in one row, pointed and inci¬ sorial on the anterior part of the jaw, but with no conical ones behind them. Body compressed; belly keeled and denticulated; these dermal ossicles forming two rows near the anus. Branchial openings large; pharyngeal teeth villiform ; dorsal with its pointed interneural spine in front, placed over the interval between the ventrals and anal. Three species. Genus XX. Mylesinus, Valenc. Dorsal and anal fins as in Myleus; pre-maxillary teeth five, sharply cutting, standing closely side by side, with their crowns a little dilated, and having a little cusp on each side, so that they may be called tricuspid, though the middle lobe forms most of the cutting edge; the neck of the tooth is narrower; a little behind the two mesial teeth, though in the same row or nearly so, there are three teeth with trun¬ cated or sloping cusps, which are rather notched than tricuspid; mandibular teeth twelve on each limb, in a single row, tricuspid, with the middle cusp oval and elongated; no conical teeth forming a second row' at the mandibular symphysis. Lips thick, fleshy, and densely papillose. One species. Genus XXL Chalceus, Cuv. (Brycon, Mull.) Pre-maxillary teeth triserial, multicuspid; the anterior ones the smallest, and seeming conical from the smallness of their lateral cusps; man¬ dibular teeth biserial, the front ones large and multicuspid, the lateral ones and those of the anterior rows conical; behind the symphysis two stronger conical teeth, as in Myletus. Body elon¬ gated, compressed ; belly rounded like that of a Trout, but covered with large scales like a Carp. A great number of pyloric casca. Eleven species. Genus XXII. Chalcinus, Mull. Pre-maxillary teeth small, crenulated, multiscupid, biserial; mandibular teeth, biserial like those of Chalceus, multi cuspid, and strong anteriorly ; two small conical ones behind the symphysial ones, and an interior lateral row of very small conical ones towards the angle of the mouth. Body compressed; edge of the belly trenchant but not serrated. Dorsal far back ; anal very long ; and pectorals long and pointed. Three species. The genus Alysia of Lowe (Zool. Tr. 1839) probably belongs to some of the preceding genera of Charicini, but the teeth are not de¬ scribed with sufficient minuteness to determine its proper place. 1. M. Valenciennes makes a small group of Serrasalmus, Pygocen- trus, Pygopristis, and C'atoprion. Genus XXIII. Serrasalmits, Lacep. Teeth triangular and trenchant, in a single row on the pre-maxillaries, palatines, and mandibular; maxillary not entering into the composition of the orifice of the mouth, but lying under the edge of the pre-orbitar, and behind the pre-maxillary. Body compressed, for the most part rhomboidal, the first dorsal and anal ray proceeding from the most prominent points of the upper and under profile; belly keeled and serrated with a double rowr of dermal spines before the anus; first interneural of the dorsal projectingone pungent point anteriorly and two posteriorly; branchial openings pretty large ; four branchio- stegals ; stomach a very large conical sac; from thirteen to twenty- one pyloric caeca. Voracious carnivorous fishes. Ova not dropping into the cavity of the abdomen. Genus XXIV. Pygocentrus, Mull. No palatine teeth; pre¬ maxillary and mandibular bones carrying a single row of trian¬ gular, trenchant, feebly-crenulated teeth. Maxillary bone as in Serrasalmus, almost hidden behind the pre-maxillary. Body com¬ pressed ; belly trenchant and serrated, the points near the anus being doubled ; branchiostegals four; caecal stomach; caeca vary¬ ing from ten to fifteen; air-bladder divided into a small globular anterior one, and a very large second one, which communicates with the oesophagus by a very short canal. Ova not dropping into the cavity of the abdomen. Four species. Genus XXV. Pygopristis, Mull. Separated from Pygocen¬ trus by the edentate and smooth roof of the mouth, but the jaw teeth are crenulated, and strongly denticulated. Two species. Genus XXVI. Catoprion, Mull, and Trosch. Salmonoids, W’ith a serrated belly, having two rows of conical pre-maxillary teeth, and one row of trenchant triangular mandibular ones. One species. Genus XXVII. Hydrocyon, Cuv. Salmonoids, with large and strong teeth implanted in a single row on both jaws; these teeth are conical, slightly compressed, and have cutting edges; roof of Classifica- the mouth smooth. Body elongated ; sides flattened in the middle ; tion—Ma- belly rounded like the back; intestines very short, with a consi- lacopteri. derable number of pancreatic caeca (thirty-five to forty). Bran¬ chiostegals four. One species. Genus XXVIII. Cynopotamus, Valenc. Differ from Hydro¬ cyon in having two rows of pointed pre-maxillary teeth, those of the exterior row very short; interior row containing four large canines; maxillary on the side of the orifice of the mouth like that of a trout, edged by a row of very small conical teeth ; mandible armed at the end by eight canines ; and a second interior row is composed of very small teeth; palate destitute of both teeth and granular eminences. Branchiostegals five. Genus XXIX. Cynodon, Spix. Salmonoids, with granular teeth on the palate; pre-maxillaries, maxillaries, and mandible armed by a single row of pointed conical teeth, among which there are enor¬ mous canines, the largest being near the symphysis, those of the mandible entering corresponding holes in the palate. Body much compressed at the pectorals; belly frequently compressed ; anal very long and scaly. Pectorals pointed and laid along the body, de¬ scending to a right angle with the longitudinal axis when they act. Stomach remarkably large. Carnivorous. Three species. Cyno¬ don scomberoides, Val., is the genus Hydrolycus of Muller. Genus XXX. Xiphorynchus, Agass. Differs from Cynodon in having a single row of pointed teeth on the palatines, as well as on the jaws. Carnivorous fish. Twelve pancreatic Cfeca or there¬ abouts. Five species. Genus XXXI. Agoniates, Mull. Intermediate between Hy¬ drocyon, which is remarkable for long canines, and Tetragonop- terus, which has two rows of pre-maxillary teeth, some of them tricuspid. This dentition distinguishes Agoniates from Cynopo¬ tamus. One species. Genus XXXII. Xiphostoma, Spix. Snout conical and elon¬ gated by the extension of the pre-maxillaries, palatines, nasal and prefrontal, and the dorsal aspect of the skull wholly covered by a granular engraved casque. The elongated pre-maxillaries and the mandible are furnished with numerous minute teeth, set closely side by side in a single row, their points recurved like a small fish¬ ing-hook ; palatines wrinkled and rough, with odontoid granula¬ tions. Body slender, elongated, and round. Dorsal very far back beyond the ventrals. Pancreatic cseca very considerable in number. Five species. Genus XXXIII. Salanx, Cuv. (Lewcosoma, Gray.) Body slen¬ derly fusiform, the thin end of the spindle being the anterior one ; jaws equal, the cleft of the mouth horizontal, slightly arched in the middle; maxillary curving over the corner of the mouth, and send¬ ing a slip in front of the end of the pre-maxillary, forming a consi¬ derable part of the border of the orifice; pre-maxillaries armed with a single series of small teeth, with four tall, subulate, recurved canines among them on each bone, the space nearest the symphysis have only a row of small ones ; maxillary edged with a pectinated row of short teeth ; mandibular teeth on the sides of the bone smaller and more numerous than those of the upper jaw ; tip of the mandible toothless, but close to it there are three strong teeth, whose points when the jaws are close pass through a rhomboidal mem¬ branous space near the point of the snout; palatine bones set with a row of fine teeth, but there are no teeth on the vomer, which does not project. Ventrals about the middle of the fish; dorsal in the middle of the posterior half, the anal still nearer the caudal fin, and the adipose fin corresponding to the posterior part of the anal. One species. Genus XXXIV. Hydropardus, Reinh. Teeth on the pre- maxillaries, elongated maxillaries, and mandible, uniserial, canines and conical ones intermixed ; the anterior mandibular teeth received into pits in the palate ; palatine teeth minute, granular; pharyn¬ geal teeth villiform. Body elongated, compressed; belly keeled. Scales small. Gill-openings extremely large; five branchiostegals ; internal rakers of the branchial arches having the form of small osseous tubercles, studded with the finest spines ; ventral fins none ; dorsal fin over the anal, which is exceedingly long, and has a scaly- base. (An. 1850.) Genus XXXV. Gonostoma, Rafin. Pre-maxillaries short, not passing the eye; the maxillary completing the upper half of the mouth, as in the Clupeidce or Salmonidce; teeth large, conical, and sharply pointed, widely set on the jaws, with very small ones in the intervals; palatines and entopterygoids covered with minute raduliform teeth, and there are rough spots on the tongue ; pharynx very narrow, the superior pharyngeal teeth resembling the teeth of a harrow, in two groups, the anterior group composed of three teeth larger and longer than the rest; fourteen branchiostegals, sub- orbitar very delicate ; dorsal placed far back ; free recurved spines on the sides of the tail. Ovarian sacs shut. One species. Genus XXXVI. Chauliodus, Bloch. (Astronesthes, Richardson. Phcenodon, Lowe, Ann. Nat. Hist., x., p. 52.) Mouth formed nearly 248 ICHTHYOLOGY. Oiassifica- as in Oonostoma, but the dentition differs; the teeth are slender tion—Ma- pointed, compressed, and curved, adhering to the hone, the mandi- lacopteri. bular ones being the largest; maxillary teeth arranged in a pec¬ tinated manner on the edge of the bone, inclining backwards; palatine teeth shorter ; tongue armed on the sides with teeth; pharyngeal teeth harrow-like. Branchiostegalsfifteen to seventeen; pectoral fins attached low down; gill-openings large; dorsal far back, anal still more posterior, its last rays opposite to the thin adipose fin. Astronesthes niger, R., fig. 2, p. 132. Mr Ayres, in the Journal of the Boston N. H. Society for 1849, describes a fish which seems nearly allied to Ghauliodus, but if the symphysial mandibular barbel and branchiostegals have not been overlooked, it can not be the same. The generic characters given of it are as follows:— Genus XXXVII. Malacosteus, Ayres. Scales small; mouth very deeply cleft, its upper border chiefly formed by the maxil- laries; pre-maxillaries short; pre-maxillary and maxillary teeth small, sharp pointed; mandibular teeth very long, somewhat curved, smaller ones behind them ; no teeth on the palatines, vomer, or gill-arches; a double row on the tongue; and a tuft on each pharyngeal; small fins ; dorsal far back over the anal; gill-cover membranouswithout ossification, and no branchiostegals perceptible. All the bones unusually soft. One species, M. niger, found in the North Atlantic. Could the bones have been softened by spoiled spirits ? Genus XXXVIIL Aplochiton, Jenyns. Characterized by a peculiar fold or longitudinal pouch in the integuments of the belly ; wholly without scales ; uniserial small teeth on both jaws ; two rows on the tongue and vomer; none on the palatines; branchio¬ stegals three. Elongated form of a Grayling, but thicker. Magel¬ lan’s Straits. The last six genera are scarcely members of this family. Family VI.—SCOPELID^E. Scopelini, Miill.; Sauridce, Valenc. Scaly or scaleless fishes with an adipose fin, whose mouth is bounded above from corner to corner by the pre-maxillary, the maxillary lying behind; acces¬ sory gills. Swim-bladder absent in most, Genus Aulopus, Cuv.; Saurus, Cuv.; Scopelus, Cuv.; Maurolicus, Cocco; Ichthyococcus, Bonap.; Chloropthalnus, Bonap.; Odontostomus, Cocco ; Baralepis, Risso; Sudis, Raf. not Cuv.; Sternoptyx, Herm.; Argyropelecus, Cocco. They are separated from the Salmonidoe by the structure of the mouth, and by the ova being discharged by a proper canal, and not falling into the general cavity of the abdomen. The maxillaries in some genera approach the corner of the mouth, and form a portion of its orifice, and in Argyropelecus they are formed of three pieces, one of which is dentiferous. This genus and Sternoptyx belong, by the structure of the mouth, to the Characinidce. Genus I. Argyropelecus, Coc. Body greatly compressed, high, with an irregular polygonal outline ; tail narrow at its com¬ mencement, and generally very thin near the caudal fin ; mouth nearly vertical, formed above by the pre-maxillaries and maxillaries, the latter in some species occupying but a small part of its orifice, in others nearly the whole upper half; maxillary composed of three pieces, one of them dentiferous ; curved, unequal teeth on the jaws; smaller ones on the palatines; branchiostegals nine; the scapular chain of bones largely developed ; thin nuchal osseous crest; four pancreatic caeca. Four species. Genus II. Sternoptyx, Herm. Body high, compressed, with long ribs seen through the silvery integument; mouth cleft almost vertically, bordered above with very short pre-maxillaries, and on the sides by the maxillaries, as in Salmo or Salar ; pluriserial teeth on the jaws, the shorter ones placed in an exterior row, and the larger ones more interiorly; palatines armed with two or three longer curved teeth anteriorly ; vomer edentate ; branchial arches and inferior pharyngeals rough with small teeth, but the extremity of the tongue smooth. The dentition of the jaws is like that of Saurus, and the palatine teeth resemble those of Chauliodus. Gill- openings wide; branchiostegals five, of different forms; coracoid bones forming a keel with an anterior point under the throat; pubic bones also having a sharp point; a triangular osseous crest before the dorsal, with one large projecting spinous point. Adipose fin pretty long. One species. Genus III. Odontostomus, Coc. Upper half of the mouth formed entirely by the pre-maxillaries which carry the teeth, the maxillary lying posteriorly and being toothless; mandible, pala¬ tines, and chevron of the vomer armed with moveable teeth, which rise by their elasticity when pressed down ; no teeth on the tongue; eye large, with an adipose fold. One species. Genus IV. Scopelus, Cuv. (Myctophum, Maurolicus, Lam- panyctus, Bonap. Upper half of the mouth bordered by the pre-maxillary, the toothless maxillary supporting it behind; teeth of the jaws small, and differing little in size; on the palatines the teeth are minutely raduliform; no teeth on vomer, in which the Classific genus differs from Odontostomus. Twenty species. Genus V. Saurus, Cuv. Elongated body, wide mouth, long, rounded pre-maxillaries, ending in a point; the toothless styloid maxillary being hidden under the integuments. Teeth numerous, conical, somewhat curved, and often with a hastate or barbed point, forming harrow-like bands on the jaws, the palatines, tongue, and pharyngeals; the small teeth being in the exterior ranks, and the larger ones interiorly. First rays of the ventrals shorter than the posterior ones, as in Platycephalus and Oallionymus, and also in the united ventrals of Gobius. Branchiostegals sixteen ; sub-operculum large, also frequently the inter-operculum. Caecal stomach large, with a short pyloric branch; pancreatic caeca few. Ovaries in a shut sac. No air-bladder. Seven species. Genus VI. Saurida, Valenc. Differ from Saurus in having an internal band of acute teeth surrounded by minute ones, as well as the band of longer palatine teeth which Saums possesses ; inter¬ nal ventral rays not so much prolonged as in that genus. Two species. Genus VII. Farionella, Valenc. Resembling a Trout. Dor¬ sal standing over the space between the ventrals and anal; an adipose fin above the end of the anal; caudal small. Upper half of the moderate-sized orifice of the mouth formed by the pre-maxil¬ laries, the very small toothless maxillary lying behind. Teeth simple and conical on the pre-maxillaries, palatines, and mandibular, also along each side of the tongue. One species. Genus VIII. Aulopus, Cuv. Maxillary dilated posteriorly, with supplementary pieces, but bordered in front by the pre-max¬ illaries, which form the upper border of the mouth. Teeth small, crowded, nearly of equal size, forming a narrow band on both jaws, on the palatines, and on the chevron of the vomer; two dental plates of very fine teeth on the entopterygoids, and the pharyngeals above and below bristle with pretty strong heckle-formed teeth. Large gill-openings. Bones of the head cavernous, with spinous points on the hinder part. Thick jointed inferior rays on the pectoral, as in some Sclerogenidce, with which in other respects the genus pre¬ sents many analogies. It has also somewhat of the external aspect of a Gadus, hut is allied more closely to Saurus by dentition, and the presence of an adipose fin. Two species. Genus IX. Paralepis, Risso. (Sudis, Rafin.) Malacoptery- gian abdominal fish, with an adipose fin, slender fusiform bodies, elongated jaws, and the upper half of the orifice of the mouth formed by the pre-maxillaries, which pass before the maxillaries. Dorsal and ventrals opposite to each other and very far back; adi¬ pose fin radiated, but the rays not articulated like true rays. Teeth trenchant, much like those of Sphyrcena. In the Hist, des Poiss. the first dorsal was considered to be spinous, but Reinhardt has shown that its rays are articulated, and Muller assigns it a position tion—M a. lacopteri. among the Scopelinidce. Genus X. Alepisaurus, Lowe. Body elongated, tapering, much compressed, acute-edged posteriorly above and below. Jaws elongated, with a wide mouth, which is bordered above from corner to corner by the pre-maxillaries, armed with small subulate teeth; lanceolate teeth on the palatines and sides of the mandible, with long subulate ones on the fore part of the latter bone. The den¬ tition has much resemblance to that of Sphyrcena or Lepidopus, and the bones have great similarity in structure to those of the Scorn- beridce. No teeth on the vomer. A long anterior dorsal extending backwards from the nape ; posterior one adipose; ventrals abdomi¬ nal. Neither air-bladder nor pyloric caeca. Lowe. Three species in the Atlantic and Australian seas. Family VII.—GALAXIDHS. Shape of a Trout, but with no adipose fin, and the dorsal far back. No scales. Moderate-sized, uniserial pointed teeth on the pre-max¬ illaries and mandible, sometimes three canines at the curve of the latter; stronger curved styloid teeth in one row on the palatines and each side of the tongue; pre-maxillaries not reaching the corner of the mouth, hut the maxillary is excluded from the edge of the orifice by the thick lip. Inhabit fresh waters in Australia, Van Diemen’s Land, New Zealand, the Falklands, and Patagonia, where they represent the Trouts. Genus I. Galaxias, Cuv. Seven species. HYODONTS. This small family group was instituted by M. Valen¬ ciennes to comprehend three genera, which have the greatly compressed sides of the Herrings, but not the serratures on the lower edge of the belly exhibited by all the typical members of that family: the presence of pancreatic caeca se¬ parates them from Chirocentrus with which they would ICHTHYOLOGY. Classifica- otherwise associate. They are fresh-water fishes, interest- tion—Ma- ing to ichthyologists from their characters, but of no great lacopten. importance to man. The Hyodons, from which the group derives its appellation, are small fishes of North America known locally by the name of Gold Eye, and having a re¬ semblance to the Trouts in feeding on insects and takin«- the artificial fly freely. They, as well as Osleoglossum, are among the fishes which have the interior of the mouth most fully armed, since they possess strong teeth far back on the palate as well as on the tongue and jaws. Family VIII.—HYODONTIDAl. Hyodontes, Valenc. M. Valenciennes places in this group Osteo- glossum, Ischnosoma, and Hyodon, which have compressed bodies and a keeled belly, without denticulations, but with pancreatic cceca, the presence of which, he says, alone separates them for Chirocentrus, though the suborbitar scale bones are more developed than in the latter. Their intestinal canal resembles that of the Mormyri. Genus I. Osteoglossum, Fereira. Body and head compressed like the blade of a sabre; head bony above, and the cheeks pro¬ tected by the suborbitars and opercular pieces ; mouth much cleft • small conical teeth on the premaxillaries and slender maxillaries, which move little, and are partially concealed by the preorbitar ; lower jaw armed like the upper one with two fleshy barbels under the symphysis; minute crowded teeth cover the vomer, the pala¬ tines, entopterygoids, presphenoid, lingual bone, and body of the hyoid bone. Gill-openings very large, overlaid by the wide mem¬ branous border of the gill-cover ; branchiostegals ten. Anal long, but separated from the small caudal; ventrals ending in a filament¬ ous point. Belly trenchant, but without denticuladons; stomach rounded, without any caecal projection ; two pancreatic caeca; air- bladder large, simple, without either partitions or horn-like pro¬ longations, but communicating with the upper part of the oesopha¬ gus by a tube having an excessively small mouth. Two species, one in the Amazon, the other in Borneo. Genus II. Ischnosoma, Spix. An Osteoglossum, with the anal and caudal united. Genus III. Hyodon, Lesu., Rafin. Body scaly, greatly com¬ pressed, thickest above the lateral line ; back acute, belly more so; profile suboval. Dorsal short, over the long anal. Eye large, pre¬ orbitar scale bones covering the whole of the cheek ; mouth wide, premaxillaries and maxillaries forming equal portions of its upper border. These bones have uniserial conical teeth, largest towards the symphysis; the mandible has two rows with their points in¬ clined backwards, and the interval between the rows covered with minute teeth ; the vomer is similarly armed, but the dental surface widens gradually as it approaches the gullet; the palatines are armed by a single row of conical teeth, with a small oval plate of very minute ones within the middle of the row; tongue strongly armed by a marginal row of hooked teeth bigger than the others, and the rest of the surface covered with minute card-like teeth’ having their points reflexed. Stomach siphonal; one pancreatic caecum ; air-bladder large, communicating with the oesophagus. Fresh-water North American fish. CLUPESOCID^E. This family was indicated by Muller in his treatise on the Natural Families of Fish, and was considered by him to be dis¬ tinct from the true Herrings by having no pseudobranchiae, which the Clupeoids all possess. On subsequently examin¬ ing some examples of the genus Megalops, he found the pseudobranchiae present, though evanescently small; and he also discovered that Gnathobolus, a genus closely related to Notopterus, has pectinated pseudobranchiae. He therefore ceased to consider the Clupesocidoe as a separate family, and referring them all to the Clupeidoe, enumerates as mem¬ bers of that family, Clupea, Pristigaster, Alepocephalus, Gnathobolus, Notopterus, Engraulis, Thryssa, Megalops, E/ops, Lutodeira, Hyodon, Butirinus, Chirocentrus, iSto- nnas, Chauliodus, Heterotis, Arapaima and Osteoglossum. Neither Anna nor Chauliodus have pseudobranchiae. M. Valenciennes has treated of the genera here enumerated as intermediate between the Clupeidce and Esocidce, and con¬ siders several of them to be types of distinct families, some VOL. XII. 249 of which have been named by him. After abstracting these, Classifica- the remainder are here placed under the head of Clupesocidce, tion M.e' as a convenient term indicating their position between the lac0Pter1^ natural families of the Herrings and Pikes. When their anatomy has been more perfectly investigated, they will be distributed by ichthyologists to their proper places in the system. One part of the structure of a fish is much attended to by Muller in his searches after the natural affinities of the various genera he examines, viz., the investments of the ovaries, or the organs which hold the roe or eggs. In the Salmon tribe the eggs are not contained in a separate sac, but drop off from the ovary as they come to maturity, into the general cavity of the abdomen, and are expelled from thence ; in the Galaxidce and in various groups that have been separated from the Salmonidce, the ovaries are inclosed in a sac, which has a canal of its own, through which the eggs pass in the process of spawning. A too rigid adherence to a single character often separates fish that are connected by many natural affinities; and some of the Clupesocidce wo\i\di associate well with the Scopelidce did they possess an adi¬ pose dorsal; the absence or presence of teeth on the palate has also been occasionally made of too much importance by systematists. 1 he genus Notopterus is peculiarly interesting to syste¬ matic naturalists on account of the combination of charac¬ ters of very different orders of fish which it presents. With the compressed body of a Clupeoid, it has the denticula¬ tions of the preorbitars, suboperculum, and mandible, and the cranial crests observed in several families of Acanthop- teri, together with a Gobioid union of the ventrals, in which also it agrees with Gonorhynchus; the dentition, especially the existence of spheroidal teeth, allies it to Butirinus, while the armature of the tongue brings it near to the Hyodontidce or to Mormyrus. The eggs are not shut up in a sac, but fall freely into the abdominal cavity as in the Salmonidce. The genus Arapaima, so named by Muller, and since called Vastres by Valenciennes, was termed Sudis by Cu¬ vier ; but Rafinesque having previously used the word Sudis to denote a fish of a totally different kind, the name has been necessarily dropt as an appellation of this genus. The spe¬ cies are of much interest not only from the peculiarities of structure which they exhibit, and their encasement in strong, bony, compound scales, but from the great size which they attain, exceeding that of almost all other fresh-water fishes, and also from the excellence of their flesh as an article of food, feii R. Schomburgk mentions, that in the Rio Negro some are taken which measure fifteen feet in length, and weigh four hundredweight. They are harpooned, or taken with a baited hook, and are the objects of considerable fisheries. They fetch a high price, and are excellent when fresh, espe¬ cially the belly part which is very fat. When salted they are exported in large quantities to Para, and are there piefened to the salted fish from the banks of Newfound¬ land. Butirinus and Heterotis are also interesting, but more from peculiarities of their structure than from their utility to man, though, as articles of food they rank among the more highly prized fishes. Family IX—CLUPESOCIDAI, Mull. No adipose fin ; no accessory gills ; premaxillaries bounding the orifice of the mouth in the middle above, and the maxillaries the sides. Some have a simple swim-bladder; pyloric caeca in a few in others absent. Distinguished from the Clupeidoe by the ab¬ sence of accessory gills. They include the following genera: Stomias, Chirocentrus, Notopterus, Osteoglossum, Heterotis, and Sudis Cuv. (or Arapaima, Mull.) These genera were either associated with Esox by M. Valen¬ ciennes, or considered as types of peculiar families ; and at a later period Muller ceased to consider these fish as forming a proper family, but we have placed them together until appropriate posi¬ tions are found for them. 2 i ICHTHYOLOG Y. 250 Classifica- Genus I. StomiaS, Cuv. Elongated scaly fish, having some- tion Ma- what oftheformof Scomberesox, but with a short high head and a laconteri. barbel depending between the limbs of the mandible. Dorsal and v r ; anal opposite near the caudal; ventrals in the posterior quarter of the fish before the vertical fins. Scales thin, forming hexagonal di¬ visions in the skin, not imbricated. Mouth cleft far past the eye, which is near the end of the very short snout; upper border of the mouth formed by the premaxillaries and maxillaries; mandible pro¬ jecting beyond the snout; strong conico-subulate curved teeth on the premaxillaries and mandible, with very small teeth on the part of the maxillary, which passes beyond the premaxillary; small teeth exist between the tall ones ; the tongue is toothed in the same manner, and the branchial rakers are in the form of long, hooked teeth. Branchiostegals seventeen ; pretty large gill-openings. Ali¬ mentary canal a long straight tube, without a stomachal dilatation ; no pancreatic cseca; ovaries, two long sacs ; a long, slender air-blad¬ der. One Mediterranean species. The want of an adipose fin seems to be the only character that separates this fish from Chauliodus, and other Scopelini. Genus II. Microstoma, Valenc. General form of Sfomms, but less elongated, with a small head and a very small mouth, wholly anterior to the proportionally enormous eye. The anal behind the dorsal, and neither of them so far back as in Stomias. Upper half of the orifice of the mouth formed by the small premaxillaries and maxillaries, both without teeth ; a few vomerine teeth, none on the palatines, nor on the tongue or pharyngeals, but the branchial rakers are long and pointed. Branchiostegals four. Intestine and air-bladder as in Stomias; pseudobranchiae crested. One Mediter¬ ranean species. The specimen in the Paris Museum is the same with Risso’s, but the imperfect descriptions of the latter giving it an adipose fin, led Muller to believe them to be different. The Chirocentres, says M. Valenciennes, approach Esox, and even Cyprinus, by the absence of pancreatic caeca, but they depart from these families to place themselves near the Clupeoids by the junc¬ tion of the premaxillaries and maxillaries. It is a family of only one species, forming the Genus III. Chirocentrus, Cuv. Body compressed, elongated ; belly trenchant, not denticulated. Dorsal far back on the tail, op¬ posite to the anal; pectorals pointed with a long styloid bone in the axilla covered with scales ; ventrals excessively small. Pharyngeal teeth strong and curved ; two mesial premaxillary teeth horizontal; upper jaw formed of small premaxillaries soldered to dentiferous maxillaries which have two supplementary pieces as in Clupea, one of them hidden under the preorbitar scale bone, the other extend¬ ing beyond the corner of the mouth ; teeth very fine and short on the palatines, two pterygoid bones, the tongue, the branchial arches, and the pharyngeals. Stomach caecal; intestine short, with the in¬ terior mucous coat forming a long spiral valve ; no pancreatic caeca ; swim-bladder long, slender, with interior imperfect trans¬ verse partitions, and an air-tube going to the stomach. Branchio¬ stegals eight. Genus IV. Notopterus, Valenc. Body greatly compressed, very thin towards the tail. Snout obtuse, with little projection, the nasal bone scarcely passing the turbinal; two small premaxillaries placed transversely at the extremity of the nasal, and suspending the free maxillaries, the latter a single bone (not of several as in the Clupeidos); limbs of the maxillaries having a deep, oblong, dor¬ sal cavity, with two trenchant edges carrying teeth ; jaws armed with minute raduliform teeth, also the palatines; a small spot on the end of the vomer, an oval surface on the presphenoid; and very long crooked ones on the edges of the tongue. The foremost two suborbital scale bones are serrated on their edges, and also the edges of a large hollow on the inferior limb of the preoperculum, which hides entirely the smooth interoper¬ culum ; operculum large, and suboperculum uianting as in the Si- luri. Large muciferous cavities in the cranium, on which there are five longitudinal ridges, namely, a mesial interparietal one and two lateral ones on each side ; the suprascapula is also cavernous, and pierced for the passage of mucoducts. Dorsal very small; anal very long and united to a small caudal ; ventrals united to one another, but scarcely perceptible from their minuteness. A genital papilla behind the anus. Belly very much compressed, and edged by a double series of denticulations. Scales small, covering the body, the gill-covers, and part of the cheeks; lateral line straight. Branchiostegals seven, erroneously stated in the “Regne Animate ” to be only one. Stomach compressed, globular, with the cardia and pylorus in front, one over the other. Ova not shut up in an ovisac, but dropping into the abdominal cavity. Air-bladder multilocular, having numerous interior partitions, and some exterior contrac¬ tions, with two long posterior horns; and two little horns that, pro¬ ceeding from the fore-part of the bladder attached to the cranium, pass under the acoustic sacs which contain the otolite, onwards to the third tubercle of the brain—a unique circumstance in fishes. Three species. Notopterus is considered by M. Valenciennes to be the type of a Classifica- peculiar family. tion—Ma- Genus V. Arapaima, Miill. (Sudis, Cuv.; non Rafin.; Vastres, iacopteri. Valenc.) Body more or less rounded, covered by a mosaic i ^ ^ ^ , work of osseous scales, which extend over the vertical fins. Anal and dorsal short, and far back. Head formed of deeply sculp¬ tured bones, with mucous cells, clothed in a thick skin; large cheek bones ; mouth pretty large, bordered above by the premax¬ illaries and maxillaries, both carrying teeth, and below by the mandible, toothed in the same way ; small raduliform teeth cover the palatines, the pterygoids, the vomer, the presphenoid, the lingual bone, and all the body of the os hyoides; and there is a plate of teeth on the internal surface of the mandible; the presphe- noidal and palatine teeth vary with the species. Air-bladder said to be cellular like the lungs of a fowl; two valves at the arterial ori¬ fice of the ventricle, and no muscular bulb. About six species in the rivers of South America. Genus VI. Heterotis, Ehren. A large cuirassed head, clothed in mucous skin, and hard mosaic scales on the body, give this genus a resemblance to Sudis, but the vertical fins are not scaly. The teeth stand in a single row on the jaws, they are re¬ curved with a rounded point; no teeth on the palatines, vomer, or presphenoid, but there are groups of straight conical teeth on the pterygoids and dilated part of the hyoid bone. Two long, thick, pan¬ creatic caeca. A cellular air-bladder enters into rings formed by the parapophyses of the caudal vertebrae, as in the Exocwti. Two species, Africa. Genus VII. Butirinus, Com. (Albula, Gronov.) Has the general aspect of some of the Indian Cyprinoids. Body regu¬ larly fusiform, with a conical head, and pointed snout, passing the end of the mandible a little. Dorsal in the middle of the length, its hinder third opposite the ventrals, the anal half-way between the latter and the largely-forked caudal. Head naked. Body covered with large, hard, firm scales; furrows on the cranium per¬ ceptible through the skin. Fine card-like teeth on the jaws, palatines, front of the vomer, and pharyngeals ; and what is charac¬ teristic of the genus are small, cup-shaped, hemispheric patches of teeth, covering a part of the presphenoid, and another on each ptery¬ goid. The convex tongue fits into the canal formed by these three bones, and its surface is also covered with granular teeth. Intes¬ tines like those of the Clupeidce. Stomach large, csecal; pancre¬ atic caeca twenty-two ; hexagonal cells in the mucous coat ot the rectum; ovarian sacs opening on each side of the anus. A long air-bladder, having its thin membrane enveloped in an exterior fib¬ rous sac, communicates with the stomach by a short tube. Nine species. The Butirines, says M. Valenciennes, are undoubtedly allied to the Clupeoids by their large air-bladder and numerous pancreatic caeca, and the want of teeth on the maxillary, but they are kept apart from that family by the absence of a keeled denticulated belly. ERYTHRINIDvE. A small family established by M. Valenciennes of several genera whose true place in the system has been much canvassed. Erythrinus is stated by the ichthyologist just named, to present in its skeleton a resemblance to the Sal- monidcB in the adjustment of the bones of the face, to the Cyprinidce in the size of the lateral occipital foramina, to the Clupeidce in the parieto-occipital foramina, and intheform of the basi-occipital, which differs totally from that of the Cyprinoids in wanting that vaulted dilatation to which the median pharyngeal plate is attached in that family ; but again it possesses Cyprinoid characters in the union of the first vertebrae and in the existence of the Weberian ossicles, connecting the air-bladder with the auditory organs, though not exactly in the same way as in the Cyprinidce. Family X.—ERYTHRINIDA). Erythrdides, Valenc. Body moderately thick ; back and belly rounded ; head large ; snout obtuse ; upper arch of the mouth formed of the small premaxillaries, with the maxillaries articulated to their extremities, both crowded with small conical teeth, as is also the mandible. Villiform teeth cover the palatines and pterygoids, and form an arched plate on the roof of the mouth, separated from its fellow on the other side by a smooth vomerine line; pharyngeal teeth also villiform. Entire cheek covered by bony suborbitar scales, followed by two temporal plates which are characteristic of the family. Stomach conical, siphonal; pancreatic caeca numerous ; ICHTHYOLOGY. 251 Clasfifica- ovarian sacs not communicating with the cavity of the abdomen ; tion—Ma- air-bladders two, united by a neck, the anterior one roundish and lacopteri. covered by a thick fibrous coat as in the Catastomi and other - ^ ^ J Cyprinidce, and inserted into the third and fourth vertebral pro¬ cesses, but not communicating with the ear ; the second is subcel- lular anteriorly, without extensive partitions, but with recesses formed by longitudinal and transverse bridles in the walls of the viscus, which project inwardly in thin folds. A tube runs from the second air-bladder to the top of the oesophagus. Erythrinus, says Muller, belongs decidedly to the Characini. Genus I. Erythrinus, Cuv., Mull. Simple, card-like teeth on the palatines ; the bigger canines among the mandibular teeth are proportionally short. Swim-bladder cellular. Six species. Genus II. Macrodon, Mull. A row of bigger conical pala¬ tines in place of the card-like teeth of Erythrinus ; on the mandible isolated very large canines. Swim-bladder not cellular. Six species. Genus III. Lebiasina, Valenc. Having the aspect of a Cyprino- don and the tricuspid teeth of that family, but with the suborbi- tars cuirassing the cheek; numerous pancreatic caeca, and a double air-bladder, partially cellular as in Erythrinus. Genus IV. Pyrrhulina, Valenc. In some of its characters this fish approaches the Oyprinidas. A scaly, fusiform fish, with the mandible projecting, and the upper lobe of the caudal elongated. Snout very short; eye rather large ; mouth formed above by the short premaxillaries carrying minute crowded teeth, and on the side by oval edentate maxillaries, which fit into pits in the man¬ dible ; the mandible has large limbs, with small conical teeth, and moves after the manner of the jaw of Mugil; the second and third suborbitar scale bones cover the cheek. Stomach roundish ; six pancreatic caeca; a double air-bladder, like that of Macrodon without cellular walls, but with a tube from the posterior conical half, which communicates with the upper part of the cesophao-us. One species, Surinam. Genus V. Umbra, Kram. Small premaxillaries, articulating at their extremities with the maxillaries, both carrying teeth ; vo¬ mer and palatines also studded with teeth. Branchiostegals five ; (Esophagus short and globular. Stomach long, cylindrical, siphonal; no pancreatic caeca ; air-bladder simple, pointed behind, rounded before, and communicating with the pharynx by a wide opening. A thickly fusiform fish, with a short-conical, smooth head, large scales on the body, and a dorsal rather posterior to the middle of the fish, and opposite to the small ventrals and anal. Caudal fin cuneate at the end. This genus is one which ichthyologists find a difficulty in assign¬ ing to any family that has as yet been characterized. It combines the characters of several groups. Muller remarks that it does not belong to the Pcecilian genus Cyprinodon, since, in addition to the premaxillary teeth, it has teeth on the vomer and palate bones; and a mouth bounded anteriorly by the premaxillaries, and exter¬ nally by the maxillaries, as in Esox, with which it agrees also in having no caecal projection of the stomach, and in the intestines and the covered pseudobranchiae. (Arch, fur Naturg.) Genus VI. Dussumiera, Valen. This fish, having the aspect of a Clupeoid, but, being without denticulations on the belly, is one of the species whose combinations of characters mock at our attempts at arrangement. It has teeth on the jaws, palatines, pterygoids, and tongue, but the vomer is smooth. There are raduliform patches of teeth on the palatines and pterygoids as in Elops, but it cannot enter the Elopidce family, because it wants the sublingual bone of Elops. It ought to be placed, M. Valenciennes thinks, between Butirinus and Elops. One species, D. acuta. Genus VII. Etrumeus, Bleek. Separated from Dussumiera because it has vomerine teeth. (Clupea micropus, Schlegel.) three generic ones. It is the only representative of the genus Classifica- Elops yet discovered, and is one of the few fishes which are tion—Ma_ lacopteri. Fig. 75. Elops saurus. common to the warmer parts of both the Atlantic and Paci¬ fic Oceans. It has been captured at New Orleans, Suri¬ nam, and on the coast of the Brazils; also on the opposite African coast at Senegal. In the Red Sea also, at the Isle of France, in the Indian Ocean, and, lastly, on the North Australian coasts and in the seas of Polynesia, westward to Japan and China. There is a likeness between the genera Lutodeira and Elops, but the great number of branchiostegals which the latter possesses at once distinguishes them. Family XL—ELOPID^E. Elopiens, Valenc. Separated by M. Valenciennes on account of the presence of a sublingual bone from the Butirinidce, to which they are nearly allied. This bone exists in Amia, but that genus has another kind of dentition. These fish are remarkable among their allies for the number of their branchiostegals, and the median bone under the branchiostegal membrane, between the limbs of the mandible, is also an unusual part of their structure. The mouth is, like that of the Clupeidce, bordered above by small premaxillaries, and long free maxillaries on the side. Teeth so fine on the pre¬ maxillaries, maxillaries, mandible, palatines, entopterygoids, vo¬ mer, presphenoid, and tongue, that they appear merely to be slight asperities. Body long and rounded ; no denticulations whatever on the belly. Dorsal medial, with no prolongation of the last ray. An enlarged and indurated scale on the dorsal and ventral edge of the base of the deeply-forked caudal; long scaly appendages in the axillm of the ventrals and pectorals. Head naked ; a diaphanous, waxy-looking, adipose eye-membrane. Stomach conical, with an ascending fleshy branch ; numerous pyloric caeca; a large air-blad¬ der communicating with the digestive canal, and forked ante¬ riorly, but not entering the cranium. Genus I. Elops, Linn. Character of the family as above. Two species. Genus II. Megalops, Commer. Body elongated, of moderate height and elegant form. Mouth bordered above by the small pre¬ maxillaries, and by the large, moveable, compound maxillaries on the sides, with the edges of both rough with minute teeth : there are teeth also on the mandible, the palatines, the pterygoids, the front of the vomer, the presphenoid, the lingual and hyoid bones, and on the pharyngeals. Wide gill-openings; branchioste¬ gals numerous (twenty-two to twenty-five). A sublingual bone be¬ tween the limbs of the mandible. An adipose eye-lid to the pretty large eye. Small dorsal, with the tip of the last ray filamentous and long. A large conical stomach; numerous slender, filiform, pancreatic casca; air-bladder large, forked anteriorly, with an air-pipe from it opening into the pharynx. Three species. ELOPIDiE. The existence of a bone between the limbs of the lower mandible is one of tbe characters of this family, and the want of’ it in Butirinus (left among the somewhat hetero¬ geneous Clupesocidce) is the reason why M. Valenciennes did not place that genus with his Elopiens. Amia is an¬ other genus in which this sublingual bone is present, but Muller has adduced various arguments founded on its struc¬ ture for considering it to be one of the few living Ganoids, and we shall accordingly mention it under that order along with the Lepidostidce which are more unequivocal Ganoids. The figure No. 75, represents the Elops saurus, or Silver- fish of Garden, a fish which has been introduced into our systematic works under four different specific names and MORMYRIDA2. A small family of fishes which abound in the rivers of both sides of Africa, the Nile, Senegal, and Congo. They are timid fish, of nocturnal habits, that frequent rocky ba¬ sins in the rivers, and would be seldom taken but for the high price they command, which renders the fishermen very assiduous. They are caught with lines to which many hooks baited with worms are affixed, and one fisherman rarely succeeds in taking more than two or three in the course of the night. Their flesh has an excellent flavour, and is greatly esteemed by the epicures of Egypt. These fish seem to have been objects of as great attention to the ancient Egyptians as they are to the present inhabitants of that country. In the Egyptian museum of Paris there is a small bronze representation of one of the sharp-nosed 252 ICHTHYOLOGY. Classifica- Mormyri surmounted by the mythic horned circle emble- tion—Ma- xnatic of the divinity Athor ; and mumified Mormyri are not lacopteri. rare g;r Gardner Wilkinson says, that the name of these flgJx in modern Egypt is Mizdeh ; and in page 250 ot the second volume of the second series of Ancient Egypt, he gives two. very recognisable representations of a Mormyrus taken from bronzes, one of them crowned by the emblem in question. A third figure is copied from a representation of the fish in the temple of the Great Oasis, where it is coupled with the name of the goddess, and shows, Sir Gard¬ ner thinks, that the fable of the metamorphosis of Venus into a fish was of Egyptian origin. The ancient Egyptians appear to have made the Mormyrus an object of veneration, but to have abstained from eating it, according to Plutarch, because it was one of three different kinds which devoured a part of the body of Osiris, and which Isis therefore was unable to recover when she collected the rest of the scattered mem¬ bers of her husband. The Mormyrus longipinnis of Riip- pell, or M. caschive of Hasselquist and Valenciennes, has been ascertained to possess electric organs, which probably exist in other species also, and may be one reason for the veneration of the whole genus by the ancient Egyptians. The long-finned species represented by one of the bronzes figured by Sir Gardner Wilkinson is either this M. caschive or the M. oxyrhinchus which has also a long dorsal. Muller found the premaxillaries of the Mormyri to be united so as to form a single bone. Family XII.—MORMYRIBiE, Mull. Mormyri, Cuv. Longish compressed bodies, with a tail slender at its origin, but swelling out at the attachment of the caudal. Head encased in a thick, naked skin, which envelopes the gill- cover and branchiostegals, and leaves only a perpendicular slit for a gill-opening. Branchiostegals six. Mouth small, and bounded above mesially by a single bone formed of the coalescent pre¬ maxillaries as in Diodon; laterally the maxillaries enter into the composition of the orifice. Dentition various. The post-frontal or temporal apparatus is simpler than in other fish, therein resembling the Siluridce. The cranium has a peculiar canal closed by the skin, leading to the interior hollow of the skull, and the acoustic labyrinth. Accessory gills absent; stomach globular; intestine long and slender; two pyloric caeca ; swim-bladder simple. Genus I. Mormyrus, Miill. A row of slender teeth, curved at the tips on the premaxillaries and mandible, and in the young a stripe of radulif'orm teeth on the hinder parts of the vomer. 31. cyprinoides, oxyrhynchus, dorsalis, longipinnis. Genus II. Mormyrops, Mull. Conical teeth on the jaws in place of curved tipped ones. M. anguilloides, labiatus. M. Valenciennes does not adopt these genera of M. Muller, as he says that conical and slender teeth exist on the jaws of the same species. He describes twenty species, in two groups, characterized by the length of the dorsal fin. Since the publication of the Ilis- toire des Poissons, Peters has discovered six new ones on the Moz¬ ambique coast. Most of the species described by M. Valenciennes have two minute lateral cusps to the teeth, separated by a notch as in Crenidens. CYPRIN0D0NT3. The typical forms of this family are small fishes, formerly considered to be Cyprinoids, but, as their name denotes, differing from the true Carps in possessing teeth, and, more¬ over, in having protractile jaws ; they want also the kind of pharyngeal grinding apparatus which is peculiar to the Carps. Species exist both in the Old and New Worlds; and some inhabit indifferently fresh, brackish, or salt water. We have seen specimens procured in a brine spring and salt marsh on the shores of the Dead Sea, on the supposed site of Sodom, probably from one of the slime pits of Siddim of which the valley was full in Abraham’s time. In one member of this family, the Guapucha {Pcecilia bogotensis), which inhabits the little river of Bogota on the plateau of Santa Fe, 8840 feet above the sea level, Humboldt found a double air-bladder; and, on examining the contained air, ascertained that 93 parts in 100 were azote, the rest being carbonic acid and oxygen. The Orestias are found at a Classifica- still greater altitude, being inhabitants of Lake I iticaca tion—Ma- and other elevated sheets of water on the Cordilleras of acopteiL Peru and Bolivia, between the 14th and 19th degrees of latitude, and from 13,000 to 14,000 feet above the sea. 1 he flesh of these fishes is a great delicacy ; and they are sought for during the winter season, when they can be transported without spoiling. Anableps is a genus which excites the attention of the dullest of observers by a conformation of the eyes which no other vertebrated animal possesses, in the cornea being divided into two somewhat unequal elliptical parts by a bridle of the conjunctiva, giving to each eye the appearance of being double. This very peculiar structure has most likely a connection with the habit the fish has of swimming with the eyes partly out of the water. Panchax and 1 an- dellia were considered by M. Valenciennes to have affinities with Pcecilia, but ow’ing to their possessing teeth on the palate he places them after Esox. Neither has Dgdopterus been enumerated among the Cyprinodonts by Muller, but no other more convenient place for these three genera oc¬ curs than just before the Esocidee. Family XIII.—CYPRINODONTIDJE, Agass. Cyprinodontes, Agass. This is a very precise family, with pro¬ minent characters. Its members resemble the Cyprinidce in habit, but they do not possess the large pharyngeal tooth, nor the bony process of the basi-occipital. Upper and under pharyngeal teeth card-like; maxillary as in the Cyprinidce, and the premaxillaries forming alone the upper half of the mcuth, but they are armed with teeth ; jaws protractile. Swim-bladder simple, and unfur¬ nished with a chain of acoustic ossicles. No supplementary gills. Stomach siphonal; no pancreatic caeca. Some are viviparous. Genus I. Pcecilia, Valenc. Jaws depressed, horizontal and protractile, the upper border of the mouth formed solely by the premaxillaries; moveable and curved teeth on both jaws in an exterior row, with a stripe of villiform teeth behind ; roof ot the mouth edentate, soft; many rows of hooked teeth on the pharyn- geals. Five branchiostegals. A single, simple air-bladder. Long, simple intestines ; viviparous. Eight species. Genus II. Mollienesia, Lesu. Having the dentition, bran¬ chiostegals, and intestines of Pcecilia, they differ in the position of the anus, advanced to between ihe ventrals, which are rather far back. A large and long dorsal and expanded caudal. One species. Lake Pontchartrain. Genus HI. Xiphophorus, Heck. Teeth bristly, short, sur¬ rounded by a row of stouter ones. Ventrals as in Mollienesia ; anal in the male close to the ventrals, the front rays thickened, con¬ nected together by a long plate, whose extremity is used as a prehensile organ ; the posterior rays very short. Three Mexican species. Genus IV. CYPRiNODON.Lacep. (Lebias, Cuv.) Viviparous fishes, with the jaws rather less depressed than in Pcecilia, the teeth in a single close row, compressed and tricuspid. Branchiostegals five. Intestines and air-bladder of Pceciha. Small fishes resembling a Minnow. Eight species. Genus V. Fundulus, Lacep. Characterized by the presence of fine card-like teeth on arched premaxillaries, the upper half of the orifice of the mouth being semicircular. Head flat beneath; and the jaws not depressed as in Pcecilia. Branchiostegals five. Eight species. Genus VI. Hydrargyra, Lacep. Heeth of Fundulus. Six bran¬ chiostegals. Four species. Genus VII. Grundulus, Valenc. Body compressed, oval; the flat upper jaw shorter than the mandible ; numerous teeth on the jaws. Dorsal far back, opposite to the anal. Branchiostegals five. Air-bladder double, the posterior one much the largest. One species, seen only by Baron Humboldt. Genus VIII. Orestias, Valenc. Thickly fusiform, apodal, scaly fishes. Dorsal and anal opposite to each other, behind the middle of the body, on the commencement of the tail. Mouth rather small at the extremity of a muzzle which bulges beneath by the projec¬ tion of the mandible; teeth fine and hooked ; pharyngeal teeth card-like. Five branchiostegals. Scales of the fore part of the fish hard horny bucklers, with occasional intervals of naked skin ; posteriorly they are ordinary cycloid scales like those of a Carp. Lower part of the belly destitute of scales, shining and metallic in lustre. Nine species, Andes. M. Gervais has instituted a genus which he names Tellia, for an ICHTHYOLOGY. 253 Classifica- Algei-ine fish which is distinguished from Cyprinodon by the want of tion—Ma- ventrals. We know it only by a brief notice in the Archiven fur lacopteri. Naturgeschichte, and are not told in what respect it differs from y ^ J Orestias. Genus IX. Anableps, Bloch. Elongated scaly fishes, with a flattish, rounded back, and depressed head. The maxillaries carry no teeth, and do not enter into the composition of the border of the mouth, which is formed above by the premaxillaries alone. On these there are teeth, the outer row being moveable like those of Pcecilia, and the inner ones minute, in a crowded band : roof of the mouth smooth, edentate ; tongue a very small tubercle; pharyn¬ geal teeth two plate^ above and below, conical pointed, villiform crowded; lips thick ; eyes prominent under a scaly arch, having the cornea and iris divided by a longitudinal band, so as to give thorn the appearance of being double. Branchiostegals five. In the male the excretory canal of the organs of generation, common also to the urinary bladder, is carried along the front of the anal beyond the tip of its first ray, in a tapering, scaly appendage, with the orifice at the extremity. The female is viviparous, but seldom produces more than seven or eight young at a time. Air- bladder pretty large, with a pneumatic duct in the foetal state, which is obliterated as the fish attains maturity. Four or five species. Genus X. Dipi.opterus, Gray. (Luciocepkalm, Bleeker.) Is placed by its affinities between Cyprinodon and Esox; the exist¬ ence of vomerine teeth brings it near Panchax, which it resembles in the position of the ventrals under the pectorals. A single anacan- thous dorsal opposite the anal. Upper half of the mouth composed of the very protractile premaxillaries, which have moreover a tuft of teeth on their ascending pedicels, and uniserial teeth on their labial limbs; mandibular teeth piuriserial in front; vomer rough, with minute teeth; four complete branchial arches; no j3seudobranchias; inferior pharyngeals widely separated, ax-med with conical teeth. Gill-openings large, coming forward under the eye. Branchiostegals five. Nostrils two in the preorbitar space. Scales Ctenoid on the body, Cycloid on the head. Stomach caeca], intestine short; no pancreatic caeca. Genus XI. Panchax, Hamilt. Buch. Thickly fusiform scaly fishes, highest in the middle, and tapering rather more towards the head than posteriorly. Dorsal far back over the posterior part of the larger anal; abdominal ventrals before the middle of the fish. Upper arch of the mouth formed by the premaxillaries, behind whose descending limbs the maxillary lies and does not touch the edge of the orifice, which is garnished all round by a narrow band of teeth as fine as hairs. Teeth on the palatines; branchiosteo-als five. Genus XII. Vandellia, Valenc. Body elongated, rounded, slenderer anteriorly; snout depressed, prominent; mouth small, situated on the ventral aspect; lips thick, with a fleshy barbel at the corners of the mouth on each side; teeth on the vomer; none, or little visible teeth on other parts of the mouth. Ventrals small, on the posterior third of the body; dorsal standing over the interval between the ventrals and anal. One species, India. ESOCIDiE. By the abstraction of groups formerly included in the Pike family, only a single genus remains to represent ii,, and of this there is only one European species, viz., Esox lucius, Linn, (the common Pike). During the earliest stage of its life it is of a greenish hue, but in the second year it becomes gray with pale spots, the latter ultimately acquiring a yellowish colour. Its markings, however, are very variable, and instances have occurred of its being perfectly white. It is one of the largest of fresh¬ water fishes, and indeed, if the accounts which some writers Classifica- give are not exaggerated, it occasionally attains a size not tion—Ma* greatly inferior to the gigantic inhabitants of the ocean. laC0Pteri- Individuals are recorded as measuring from o to 9 feet in length. They frequently weigh above 30 lb. in the lakes of the north of England; and Dr Grierson mentions one taken in Loch Ken, in Galloway, which weighed 61 lb. Pallas states that the lakes in the government of Tobolsk in Siberia nourish multitudes of-Pikes which at¬ tain the size of between 30 and 40 lb. In North America, which seems to be the headquarters of the family, since not only the common European species, but several others exist in the great lakes of that country, 30 lb. is con¬ sidered a large size, though doubtless some individuals attain a greater weight. Most authors have cited the accounts of one said to have been caught at Kaiserslautern, near Manheim, in 1497, which, was nearly 19 feet in length, and weighed'350 lb. The skeleton of this extra¬ ordinary specimen was for a long time preserved, and bore a brass ring with an inscription to the effect that the fish was put into a pond by the hands of the Emperor Frederick II., the 5th of October 1262. From this it is inferred that it was upwards of 235 years old. M. Valenciennes enters at some length into a critical examination of the truth of this story. Gesner, who lived soon after the time assigned to the capture of this remarkable fish, and who might have known eye-witnesses of the event, says that it was caught near Heilbronn, in Suabia; and in 1592 Lehman saw a painting of the Pike and a sketch of the ring kept in a tower on the road from Heilbronn to Spires, and the piece of water whence it was taken was still named Kaisenvag, or the Emperor’s Lake, in 1612. Thei'e seems to be no doubt but a fish of great size and great age was taken about the time mentioned, but there are discrepancies enough in the various accounts that are given of it by authors to make the details doubtful; and a celebrated anatomist having examined the skeleton of the said Pike, then kept in the Cathedral of Manheim, found the vertebrae to be more nu¬ merous than those of a single Pike, and in fact that the skeleton had been lengthened to fit the story, which had itself undergone the same process from that love of the marvehous which is common to every age. The common Pike is not only an inhabitant of most of the larger waters of Europe and northern Asia, but it is certainly one of th j native fishes of North America. This is a question of i iterest to those who are engaged in tracing the distribu¬ tion of animals, and some pains were taken to ascertain the identity of the species in the two hemispheres. A specimen brought from Lake Huron was examined by Baron Cuvier and M. Valenciennes, and found to be the same with the European one ; and Sir John Richardson carefully compared the European and American fishes with each other without- detecting any specific difference. Some American ichthyolo¬ gists have questioned the accuracy of these examinations, but they do not appear to have given sufficient weight to the fact of there being more than one species in the great lakes of their country, and the chance of the specimen they commented on being one of these. E. estor inhabits Lake Huron, as well as E. lucius, and most likely there are others in that lake or in the fresh-water seas that communicate with it. M. Yarrell gives some interesting facts respecting the value of this fish at different periods of English history. Edward the First fixed the price of a Pike higher than that of fresh Salmon, and ten times greater than that of the best Turbot or Cod; and in the reign of Henry the Eighth a large one was sold for double the price of house-lamb in February, and a Pickerel pr young Pike for more than a fat capon. I hese facts are sufficient to show the error of some writers on British ichthyology, who have fixed upon the reign of Henry the Eighth as the epoch of the intro¬ duction of the Pike into the British isles ; which Albin says 254 ICHTHYOLOGY. Classifies- was in 1537. Leland mentions that a Pike of great size tion—Ma- was tafcen \n Ramesmere, Huntingdonshire, in the reign lacopteri. ()f £c]gart pikes are proverbially voracious. There seems, indeed, to be no bounds to their gluttony ; for they devour indiscriminately whatever edible substances they fall in with, and almost every animal they are able to subdue. “ It is,” says M. de Lacepede, “ the Shark of the fresh waters; it reigns there a devastating tyrant, like the shark in the midst of the ocean ; insatiable in its appetites, it ravages with fear¬ ful rapidity the streams, the lakes, and the fish-ponds that it inhabits. Blindly ferocious, it does not spare its species, and even devours its own young ; gluttonous without choice, it tears and swallows, with a sort of fury, the remains even of putrified carcasses. This bloodthirsty animal is also one of those to which nature has accorded the longest duration of years; for ages it terrifies, agitates, pursues, destroys, and consumes the feeble inhabitants of the waters which it infests; and as if, in spite of its insatiable cruelty, it was meant that it should receive every advantage, it has not only been gifted with strength, with size, with numerous weapons, but it has also been adorned with elegance of form, symmetry of proportions, and variety and richness of colour.” A singular instance of its voracity is related by Johnston, who asserts that he saw one killed which con¬ tained in its belly another Pike of large size, and the latter, on being opened, was found to have swallowed a water-rat! Its flesh is well flavoured and easy of digestion, and is con¬ sequently much sought after as an article of food, especially for convalescents, and others of weakly habit. It is most tender and nutritive in young individuals, but full-grown Pikes are occasionally found in which the flesh on the back and near the vertebral column acquires a greenish colour, which is held in high repute, and often purchased at a great price. Sibbald, writing in the reign of Charles the Second, says that the heart of the Pike is a remedy against febrile paroxysms, that the gall is of much use in affections of the eyes, that the dried jaws reduced to powder are a remedy in pleurisy, gravel, and stone in the bladder, and that the ashes of the fish are used to dress old wounds. These and the rest of his statements on medical subjects have the formal approbation of the President and Censor of the Royal College of Physicians of Edinburgh. Even the names of the Pike is a subject not without its interest. It is the Lucio or Luzzo of the Italians, an appel¬ lation evidently descended from the Latin lucius. Auso- nius, in using this term, says that it was a despised fish on the Moselle, very contrary to the estimation in which it was held in England ten centuries later—■ Lucius, obscuras ulva camoque lacunas Obsidet. Hie nullos mensarum lectus ad usus, Fervet fumosis olido nidore popinis.” In Sweden it is named Gadda, and in Denmark Giedde, Gedde, Gede, or Gei, names differing little from the ap¬ pellation of the fish in the lowlands of Scotland, “ Ged,” and showing, with many other instances of Scandinavian words relating to maritime affairs and fisheries, the origin of the population that displaced the Celtic races from the country lying to the south of the Firth of Forth, and on the east coast of Scotland still farther north. M. Valenciennes has printed a long list of the names which the fish bears among the Sclavonic and Tartar peoples, none of which seem to have any relation to those by which it is known on the western coast of Europe. The Scandinavian name had probably its origin in the sharpness of the teeth of the Pike, and the consequent danger of injury to those who attempted to handle it, for we find a similar word, Gede or Geede, used to designate a goat in Danish (also lowland Scottish “ Gait”), and Gedehams, to signify a hornet. The English names Pike and Pickerel are evidently sprung from the Saxon Piik (sharp-pointed), and the French Canadians term the Lucioperca of that country the Piccarel, which it well merits, as its teeth are no less formidable than those Classifica- of the Esox lucius. tion—Ma- lacopteri. Family XIV.—ESOCIDAi, Mull. Scaly fishes without an adipose fin, and possessing covered glan¬ dular accessory branchiae. Orifice of the mouth formed above in the middle by the premaxillaries, and on the sides by the max- illaries. A simple swim-bladder. Diffuse vascular ramifications exist on the inner surface of the skin, which are peculiar to this family. Stomach siphonal; no pancreatic caeca. Type of form the common Pike; inhabitants of fresh waters only, in the northern hemisphere. Genus I. Esox, auct. GONORHYNCHS. The members of this small family are more interesting from the peculiarities of structure that they exhibit, and which are briefly denoted in the generic characters, than by their importance in an economical point of view. The Chanos, however, has been named Milk Fish, from its de¬ licacy as an article of food. Fig. 77. Chanos or Lutodeira salmonea. A scale of this fish has been represented on a preceding page (fig. 40), and the following woodcuts give the portrait of Gonorhynchus Greyi, a fish of Western Australia, and of one of its scales. Fig. 78. Gonorhynchus Greyi. Fig. 79. Scale of Gonorhynchus Greyi. On the Alepocephalidce, we have no remarks to make. Family XV.—GONORHYNCHIDA1. Gonorhynques, Valenc. This small family was constituted by M. Valenciennes for the reception of two genera which want oral teeth, and thus have some affinity with the Cyprinidce. Genus I. Chanos, Lacep. (LwtocZm-c*, Van Hass., Rupp.) The Chanos have an affinity to the Clupeidm without actually belonging to that family, and are separated from the characteristic Herrings by the belly being rounded and not carinated, nor denticulated. They resemble the Butirinidce and Gonorhynchi in their fatty eye¬ lids, toothless jaws, and scaly appendages in the axillae of the pec¬ torals and ventrals; they have, moreover, a lanceolate scaly fillet above and below the lateral line on each side, extending longitudi¬ nally over the caudal, dividing the long acute lobes of the forked caudal from a small central portion. Chanos is further character- ICHTHYOLOGY. Classifica- ized by a peculiar hollow behind the gill-opening, which commu- tion—Ma- nicates with the gills through an aperture, and lodges an accessory lacopteri. gill that has cartilaginous supports. The intestinal canal is very ■ l°ng) being doubled upon itself many times, and in the interior of the cesophagus there is a complete spiral valve, of numerous turns, and with fringed edges, which have been observed in no other genus. Pancreatic caeca numerous. Air-bladder double, communicating with the oesophagus. Upper half of the mouth formed partly by the premaxillaries, partly by the maxillaries. General aspect that of a Coregonus. Species eight. Genus II. Gonorhynchus, Gronov. (Rhynchcena, Rich.) Body elongated, with a slenderly conical head, ending in an acute snout, which has a small median barbel beneath. Dorsal and anal fins opposite, very far back ; long scaly processes in the axils of the pectorals and ventrals; branchiostegal membrane uniting with the surface of the throat, and leaving merely a vertical slit for a gill¬ opening. Branchiostegals four ; lips fringed and lobed. Scales small, pectinated on the edge by a row of long and strong teeth. Pharyngeal teeth cylindrical, truncated ; pyloric crnca six to nine; no air-bladder. Two species. 255 Family XVI.—ALEPOCEPHALID^E, Valenc. This family consists of a single species, of which M. Valenciennes says “the genus Alepocephalus is separated from all others, and forms the type of a peculiar family.:, The upper jaw is that of the Pikes (Esox), with an alimentary canal like that of the Clupeoids, and a spiral valve in the rectum like Amia, but with many pancreatic caeca and no air-bladder, whereas Amia and Chirocentrus have re¬ markable air-bladders and no pancreatic caeca. No denticulations on the belly like those of the Clupeoids. Body compressed, rounded beneath ; long scaleless head. Short premaxillaries bearing teeth, forming the upper half of the mouth; toothless maxillaries lying behind them ; palatine and mandibular teeth small. Siphonal sto¬ mach with numerous pancreatic caeca; spiral valve in the rectum. One species. Genus I. Alepocephalus, Risso. CYPRINOIDS. This large family is a very natural one, but the great conformity of structure exhibited by its very numerous species is a source ot difficulty to ichthyologists who have attempted to divide it into genera, and other subordinate groups. It is wholly a fresh-water family, and among the least carnivorous in the class of fishes. Fig. 80. Cyprinus carpio. Cyprinus carpio, the common Carp. This well-known fish is of an olive-green, yellowish beneath, having the anal and dorsal spines strong and denticulated, and the barbels short; the pharyngeal teeth are flat and striated on the crown. It is a native of the central countries of Europe; but, owing to its value as an article of food, it was early distributed by human agency over the whole of that Continent. The ease with which it can be transported from one place to another, and its speedy growth and pro¬ pagation in ponds and artificial reservoirs, afforded great faci¬ lities for its rapid dispersion. The year 1614 is assigned as the date of its first introduction into England ; but it w as na¬ turalized in Germany and Sweden nearly half a century be¬ fore that period. It delights in tranquil waters, preferring such as have a muddy bottom, and the surface partially shaded with plants. Its food consists of the larva of aqua- Classifica- tic insects, minute Testacea, worms, and the tender blades tion—Ma- and shoots of plants. The leaves of lettuce, and other lacoPteri- succulent plants of a similar kind, are said to be particu- larly agreeable to them, and to fatten them sooner than any other food. Although the Carp eats with great vora¬ city when its supply of aliment is abundant—to such a de- giee, indeed, as sometimes to produce indigestion, which occasionally proves fatal—it can subsist fbr an astonishing length of time without nourishment. In the winter, when the Carps assemble in great numbers, and bury themselves among the mud and the roots of plants, they often remain lor many months without eating. They can also be preserved alive for a considerable length of time out of the water, especially if care be taken to moisten them oc¬ casionally as they become dry. Advantage is often taken of this circumstance to transport them alive, by packino- them among damp herbage, or wet linen; and the opera¬ tion is said to be unattended with any risk to the animal especially if the precaution be taken to put a piece of bread in its mouth steeped in brandy! In a similar way the Dutch preserve them by suspending them from the roof of a damp apartment in a bag-net filled with moss, which is continually kept moist, and they are fed with vegetables and bread steeped in milk a mode of treatment by which they are not only kept alive, but actually thrive and fatten The fecundity of these fishes is very great, and their numbers consequently would soon become excessive but for the many enemies by which their spawn is destroyed No fewer than 700,000 eggs have been found in the ovaria of a single Carp, and that too by no means an individual of the largest size. Their growth is very rapid, more so per¬ haps than that of any other fresh-water fish, and the size which they sometimes attain is very considerable. In cer¬ tain lakes in Germany and Prussia, individuals are occa¬ sionally taken weighing thirty or forty pounds; and Pallas relates that they occur in the Volga five feet in length and even of greater weight than the examples just alluded to. 1 he largest of which we have any account is tha mentioned by Bloch, taken near Frankfort-on-the-Oder which weighed seventy pounds, and measured nearly nine feet in length. M. Valenciennes commends the small figure of the Carp in Mr Yarrell’s British Fishes, as bein- the very best representation of the fish that he had seen ° Cyprinus auratus (Gold Fish). This beautiful spedes the most brilliantly adorned of all our fresh-water fishes> and scarcely surpassed even by the more richly ornamented inhabitants of the ocean, is well known to be a native of China, although it is now domesticated, so to speak in almost every country, both of the old and new world. Like the Carp, it has the dorsal and anal spines denticu¬ lated. When young it is of a blackish colour, and it gra¬ dually acquires the fine golden red by which it is chamc- terized; but some examples are of a silvery hue aud others are variegated with three different shades of colour Like most other animals that have been long estranged from their natural habits, and subjected to artificial influ ences, this species presents a great many varieties extend ing even to some important parts of structure. Individuals occur without a dorsal, others with a very large one others with the caudal greatly enlarged, and divided into three or four lobes; and in some instances the eyes are enormously dilated. I he Golden Carp is said to have been originally confined to a lake near the mountain Tsienking, in the province of The-kiang, in China, about N. Lat 30 It bTght t0 Enflanld, in 1691’ but was ve'ry scarce till 1728, when a considerable number were imported and they soon became generally known. They do not flourish in rivers and open ponds, not, however, because such places are uncongenial to them, but because they are exposed to many enemies, against which they have no means of de- —— ^ ' 256 ICHTHYOLOGY. Classifica- fence. When kept in confinement they ought t0 tion—Ma- nourished with fine crumbs of bread, small woims, flies, lacopteri. an(_j ^ 0feggS dried and powdered, and the water ought to be frequently changed. 1 he ordinary length ot this species is from four to six inches ; but they have been sometimes known to reach a foot. Although natives of a warm climate, they can sustain a great degiee of cold un¬ injured. An individual, which was accidently exposed during the night, was completely frozen up in the centie of its glass jar; but as the ice thawed it recovered its vigour, and seemed to suffer no further inconvenience. fish), of the Danes. In some parts of Germany it is named Classifica- Fig. 83. Leuciscus rutilus. Rothauge, but in general it is called in that country Roche, an appellation evidently identical with its English one. The Chub, named in Cumberland Shelly, is a well known English fish, and has received its northern appella¬ tion (quasi Scaly) from the size of its scales. Fig. 81. Tinea vulgaris. The Tench (Tinea vulgaris') is of a deep yellowish brown, sometimes, however, assuming a fine golden colour. Its usual length is from 12 to 14 inches; but instances are on record of its having reached 3 feet. It inhabits stagnant waters with a muddy bottom ; and in the win¬ ter conceals itself among the mud, and seems to undergo a kind of torpidity. In May and June it deposits its ova among aquatic plants; these are very minute, of a green colour, and so numerous that 297,000 have been reckoned in one female. The Tench is very extensively distributed, appearing to occur throughout Europe and Northern Asia. “ Quis non et virides vulgi solatia Tineas norit.” Atrsoxius. Its flesh is not much esteemed, as it is soft, insipid, and difficult of digestion. Fig. 82. Leuciscus brama. The Bream (Leuciscus brama, Valenc.) is common in slow-flowing rivers and lakes in most European countries. It sometimes acquires 2^ feet in length, but its ordinary dimensions may be stated to be about 1 foot. Worms, confervae, and aquatic plants are its usual food; but like manv allied species, it often swallows mud, which renders its flesh unsavoury. “ There exists in the River I rent, in the neighbourhood of Newark, two species or varieties of Bream. The common Bream is known there by the name of Carp Bream, from its yellow colour, and has been taken of nearly eight pounds weight. The other species or variety, which I believe to be a nondescript, never ex¬ ceeds a pound in weight. It is of a silvery hue, and goes by the name of White Bream.” Leuciscus rutilus (Valenc.) is the Garden of French fishermen, and the Rodskalle (Red-scale), or Rodjisk (Red- English ichthyologists have all given it the specific name of cephalus, but M. Valenciennes remarks that the term cephalus was applied by Linnaeus to an assemblage of an ergtkrinus with the tenth species of Artedi, which itself comprehends several European Cyprini. He therefore employs the specific name of Jeses, also Linnaean, to de¬ note the Chub of England, which is the Jentling or Brat- Jisch of the Danube, and the Jeses or Jese of the Oder. Leuc. phoxinus (common minnow) is familiar to all. It is the smallest species of the genus found in Europe, the greatest length which it attains seldom exceeding 3 inches. It first makes its appearance in March, and disappears in October, passjng the winter beneath the mud. It is well known to be a gregarious species, and small shoals are to be found in almost every shallow stream, especially in clear weather, as they seem to delight in warmth and sun¬ shine. They usually spawn in the month of June, but their ova are often found at a much later period. The flesh of the minnow is delicate and well-flavoured, but its size is too small to admit of its being of much value as an article of food. It is principally used as a bait for the capture of larger kinds. Family XVII.— CYPRINIDiE. Cuprinoidei, Agass. A small, soft, toothless oral orifice, the upper half formed by the pre-maxillaries only, the maxillaries lying be¬ hind them; no teeth except on the bones circumscribing the pos¬ terior aperture of the mouth; under pharyngeals armed with one large tooth; upper pharyngeal wanting. On the base of the cranium, or basi-oceipital, and opposed to the under pharyngeals, there is a projecting process covered for the most part by a horny plate. Most have scales (Aulopyge, Heck., is an exception). No adipose fin. Siphonal stomach; no pancreatic caeca; swim-bladder in most divided into a fore and hinder part, and connected with the acoustic organs by a chain of ossicles. The presence or absence of supple¬ mentary branchiae varies with the genera. Colitis and Acanthopsis, having bony coverings to the swim-bladder, ally themselves to the other Cyprinidce, as Clarias, Heterobranchus, Heteropneustes, and ICHTHYOLOGY. 257 Classifica- Agcneiosus, which have a bony capsule to the swim-bladder, do to the tion—Ma- Siluridce. This structure does not exist in all the Cyprinidce allied lacopteri. to Cobitis; and in Schisturn there is a thick-skinned swim-bladder v- t ^—y behind the enlargement of the vertebras. Both M. Agassiz and M. Valenciennes restrict the genus Cobitis to the species which want teeth. This great family, as now restricted, comprises fresh-water fishes only. It contains a great number of species in all parts of the world, and no one has as yet made a satisfactory arrangement of them, and characterized the groups so that they can be easily dis¬ tinguished. We follow M. Valenciennes in the primary grouping. Genus I. Cyprinus, Lacep. A long dorsal, with three stiff pun¬ gent rays, the third and longest one being often denticulated on its hinder edge, resembling the rays of some Siluroids; anal with two strong solid rays. The under pharyngeal teeth are five, one being very large, with curved, seemingly concentric edges, and three somewhat wavy parallel enamelled ridges, separated into two by a longitudinal furrow: farther back on each side of this principal tooth there are two others, not half as big, having flat and worn crowns; before the large mesial tooth there is another rounded one, without eminences; and behind all, a fifth very small tooth. This is the dentition of the Cyprinus carpio, or common Carp, but the number of teeth varies with the species. Body thick, more or less high, with flat sides, and thick scales. One group (Cyprinus) has small barbels at the corners of the mouth; another wants them (Cyprinopsis, Fitzing.) Twenty species in the Histoire des Poissons. Genus II. Barbus, Flem. Body fusiform. Dorsal short, with three small simple rays in front, and a fourth very strong one, like that of Cyprinus, sometimes denticulated, in other species smooth; two barbels in front of the maxillary joint, and two labial ones from the corners of the mouth; four in all. Pharyngeal teeth coni¬ cal, elongated, and a little curved. Sixty-two species, subdivided by the smooth or denticulated rays, and the proiectinfr or non- elongated snout. * Genus III. Labeobarbus, Rupp. Body elongated. Lips thick, the inferior one having a single symphysial thick barbel, making five barbels in all, including the pair of maxillary, and pair of labial ones. A firm ray not denticulated in the dorsal, and a short anal. Three species. Genus IV. Schisothorax, Heck. Cyprinoids with a maxillary and labial barbel on each side. Dorsal and anal short; three dorsal osseous rays, the third one denticulated. Scales small; a cutaneous fold on the posterior part of the belly, clothed with larger scales, concealing the anus and greater part of the base of the anal, like a slit sheath. Mouth various, giving rise to subdivisions founded on its several kinds of form. Ten species. Genus V. Racoma, M'Glell. Differs from Schisothorax in the projecting maxillaries ; the premaxillaries form a moveable append¬ age to the mouth. Genus VI. Oreinus, M‘Clell. Head fleshy; mouth vertical; mandible shorter than the premaxillaries; snout muscular and projecting. Dorsal preceded by a serrated ray. Scales small. In¬ testinal tube five or six times as long as the body, capacious. Mountain fish. Genus VII. Schisopyge, Heck. Separated from Schisothorax, by the acute cartilaginous-edged mandible, and the bony ray of the dorsal, standing either before or above the ventrals. Genus VIII. Dangila, Valenc. Remarkable for the length of the dorsal, without the anterior osseous ray, differing in the latter character only from the dorsal of Cyprinus: another peculiar cha¬ racter is the conical papillae on the border of the upper lip, resem¬ bling small teeth; a labial and a maxillary barbel on each side. Genus IX. Lobocheilos, Bleek. Between Labeo and Barbus. Border of the mouth threefold; lips smooth, not fringed, the inferior one forming a square fleshy lobe ; snout prominent, fleshy. Four maxillary and labial barbels. Ho toothed dorsal or anal spine. Labeo falcifer, Cuv. and Valenc., and three others. Genus X. Crossocheilos, Bleek. Mouth inferior, with a three¬ fold border, the orifice a parallelogram ; lips crenated or fimbriated with papillae ; snout fleshy, very prominent, with two barbels. No toothed dorsal or anal spine. Labeo oblongus, Cuv. and Valenc. Genus XI. Devario, Heck. Pharyngeal teeth knife-edged; mouth subinferior ; lips round. Two barbels at the corners of the mouth, or none. Dorsal and anal fins elongated, each with a smooth osseous ray having a flexible tip. Intestine between four and five times the length of the body. Seven species. Genus XII. Nuria, Valenc. Cyprinoids with the dorsal far back like that of a Pike, short and without spines. No maxillary barbels, but a pair of labial barbels at each corner of the mouth, keeping up the number four. Thin lips. Two species. Genus XIII. Rohita, Valenc. Four barbels round the mouth; thick fleshy lips, with their edges fringed more or less. A thick fold of skin inclosing the lips, forming above a sort of muzzle; and below a veil covering the closed mouth. Premaxillaries small, VOL. XII. and attached to beneath the point of the nasal, so that the mouth is protracted like a cupping-glass. When the lips are retracted they retire within the second lip or fold of skin. Intestinal canal very long. Herbivorous. Twenty-three species. Genus XIV. Capoeta, Valenc. Intermediate between Barbus and Gobio, and containing species with a barbel at each angle of the mouth, or two in all; some with a denticulated ray in the dor¬ sal; others with a solid ray, not denticulated; and a third group again with the ray soft. Genus XV. Cirrhinus, Cuv. Maxillary barbels, two in all; no labial ones. A moderate-sized dorsal without spines, all the rays being flexible. Lips thin; snout not elongated beyond the mouth. Genus XVI. Gobio, Cuv. Dorsal and anal short, without spines. Barbels labial, i.e., at the corners of the mouth. Pharyngeal teeth conical, slightly curved at the tip, and in two rows. Genus XVII. Tinca, Cuv. Thick and broad body, covered with small scales, and a labial barbel at each side of the mouth. Pha¬ ryngeal teeth clubbed. Genus XVIII. Labeo, Cuv. Snout thick and fleshy, projecting over the mouth, which is furnished with triple lips, one emanating from the preorbitar and extending over the two others, a second from the maxillary, and a third the true lip below, detached so as to make a mandibular velum; a small barbel at the corner of the maxillary. Anterior dorsal rays slender and simple, the others branched and very flexible. The Labeos, therefore, are Cyprinoids, with the dorsal of Gobio or Tinca, but with lips approaching those of Rohita, and differing merely in their disposition. These fish belong entirely to the old world. Heckel makes a group of the Cyprinoids which have these double or triple rows of lips, which he names Pennochitce; and includes in it the genera Labeo, Rohita, and three characterized by himself, Pylognathus, Discognathus, and Cyrene. The following genera want barbels. Genus XIX. Leuciscus, Valenc. The length of the anal has been given as a distinctive character of Abramis, and its short¬ ness of Leuciscus; but M. Valenciennes, finding that there was an imperceptible gradation in the length of this fin among the species, ranges them all under Leuciscus, and considers generally as mere specific characters those derived from the form of the pharyngeal teeth by which Agassiz, Bonaparte, and Heckel have sought to de¬ fine the numerous groups they have formed. Leuciscus is to be known, then, chiefly by negative characters. Short dorsal without spines ; anal short or long, also without spines, and no particular conformation of the lips. In the Histoire des Poissons one hundred and forty species are described in eleven groups. The following genera have been characterized by the authors whose names are given, and Dr M'Clelland, in his account of the Indian Cyprinid®, has named and described numerous groups, but a revision of the entire family is needed before the proper places of these proposed genera can be found. The Prince of Mu- signano's Catalogo Metodico dei Cyprinidi d’Europa may be con¬ sulted with advantage by those who wish to master the arrange¬ ment of the Cyprinoids. Genus XX. Gila, Baird and Girard. Body fusiform, com¬ pressed, with the back more or less arched in the older fish. Head depressed, uncommonly small, its upper profile concave; snout elongated; no barbels. Pharyngeal teeth oblique, compressed in two rows, hooked at the point. Four gills. Genus XXL Chondrostoma, Agass. A horny cartilaginous plate covering the lower lip, easily detached in dead fish, but leav¬ ing the soft keel on which it was implanted. Some have labial barbels, and others maxillary barbels, and there is much variety in the pharyngeal dentition. Ten species. Genus XXII. Catla, Agass. Maxillaries dilated, and forming thin laminae, which advance over the equally thin premaxillaries, forming a snout shorter than the mandible, whose limbs are like¬ wise so dilated as to encase one another, and give a prominent, rounded form to the throat; when depressed the lower jaw looks like the bowl of a large spoon. The lower lips are thick and fleshy, but without barbels; and the branchial rakers are long and hair-like, and very flexible, resembling the same organs of a Clu- peoid rather than of a Cyprinoid. One species. Genus XXIII. Aspidoparia, Heck. Mouth small; no barbels. Suborbitar scale-bones covering the cheek. Short base of the dorsal fin standing over the interval between the ventrals and longer anal; ventrals with seven divided rays; lateral line much decurved. ( Genus XXIV. Catastomus, Forster, Lesu. Resembling the European Barbel in general form, but having neither maxillary noi labial barbels,and no bony or denticulated rays in the dorsal. Mouth under the snout, without teeth; lips large, lobed, and variously 2 K / Classifica¬ tion—Ma- lacopteri. 258 ICHTHYOLOGY. Classifica- farrowed and papillated according to the species. The pharyngeal ^lassmcd, r r armPfl with a ncctinated row tion—Ma> lacopteri. lUllAiVYCUL U.11VX 1/iXXt*ovvv». o A » 1 bones large and semicircular, are armed with a pectinated row of compressed teeth, whose crowns are wider than their bases ; and whose size decreases gradually from below upwards. Gill-covers large. Scales varying in size with the species. The intestine is long, and the air-bladder is divided into two in some, into three or even four parts in others, the foremost division having an exterior, thick, fibrous outer coat, which the others want. Twenty-two ^Gfn'tts XXV. Rhinichthys, Agass. Distinguished from other Catastomi by the conical elongation of the snout. Genus XXVI. Sclerognathus, Valenc. Mouth not quite ter¬ minal, but the snout advances less beyond it than in the Catastomi. The premaxillaries are suspended, as in that genus, under the car¬ tilaginous extremity of the nasal, have long pedicels, and very short transverse processes, the rest of the orifice being formed by a fibrous ligament within a thin upper lip. The maxillary is a broad solid bone, under which the lip retires, and it is itself hidden by the broad preorbitar. Lower lip narrow and thin. The structure of the mouth is that of Catastomus, without the fleshy development of the lips. Mucous pores as in the Catastomi, and also a pectinated row of pharyngeal teeth, but not so large. Air-bladder divided into two, with two small lobules behind the second. Two species. Genus XXVII. Exoglossum, Rafin. Body elongated, little compressed. Small scales. Anus far back. Head without scales, flattened beneath; mouth terminal; mandible short, divided into three or five lobes, and resembling a tongue. Ventrals nine-rayed, opposite to the dorsal. Pharyngeal teeth hooked, without denticu- lations, with a small flat crown, and in two rows. No pores on the head. Species five. Genus XXVIII. Cobitis, Artedi. Mouth small, edentate, sur¬ rounded by from four to eight barbels ; gill-opening a vertical slit, high up j branchiostegals three. Preorbitar hidden entirely by the skin, or in some prolonged into a spine, seldom followed by the other suborbitars, which are absent in most Cobites. No solid dorsal ray ; no superior pharyngeals. Scaly fishes like all the Cyprinidm. M. Agassiz separates the species with spinous preorbitars under the name of Acanthopsis, and M’Clelland calls the group which have forked caudals Schistura; but M. Valenciennes does not consider these divisions as natural or established on important peculiarities of structure. Forty-six species are described in the Histoire des Poissons, in four groups. Genus XXIX. Balitora, Gray. (Platycara, M{Clell.; Ho- maloptera, Kuhl et Van Hasselt.) Allied to Cobitis by the edentate mouth, furnished with small barbels, but differing in their flatly de¬ pressed head, and in the size of the pectorals and ventrals, the bones which sustain these fins forming large plates, from which the fins spread horizontally like those of Callionymus. Body scaly above, naked on the ventral aspect. A short, simple, intestinal canal, with a globular stomach ; no air-bladder. Seven species. SILUROIDS. This very large family brings up the rear of the Mala- copterygians which have an air-tube to their swim-bladder (Physostomi, Mull.), and in fact some of the rays of their fins are firmer, stouter, and nearly as hard as the spinous rays of the Acanthopteri. It is indeed only when the joints of Malacopterygian rays have much length that they have great flexibility; and there are gradations of abbreviation and consolidation until the joints become nearly or wholly obsolete, and the rays as pungent as the first rays of the pectorals and dorsal of the Siluroids, which are powerful bony weapons, often strongly toothed or serrated. Yet these strong bones (which, in the fossil state, are named Ichthyodorulites) frequently betray their compound nature by their tips being soft, flexible, and jointed. There are many peculiarities in the skeleton of the Silu¬ roids, arising from the absence of some bones, and the greater development of others. The cavity of the cranium is not open laterally, as in most osseous fishes, but is closed, as in the CyprinidcE, by the orbitosphenoids and the ethmoid that unite with the prefrontals, carrying forward the cranial cavity to the nasal bone without leaving a membranous septum between the orbits. The petrosal is often wanting in fishes of this family, and some do not possess even the parietal. But the supraoceipital is greatly developed, and in many, the suprascapula is united by suture to the sides of the cra¬ nium. In numerous members of the family the skull is enlarged, posteriorlv, to form a kind of helmet which spreads Classifica- over the nape; the lateral angles of this production are tion—Ma- formed by the suprascapula;, augmented and fixed by ^acopterL suture, and the median part is the extension of the supra- v-®- oecipital, which stretches out to touch or even articulate with the osseous expansions of the anterior interneurals. The supraoccipital, which is generally very large, articu¬ lates anteriorly with the frontal, and passing backwards be¬ tween the postfrontals, the parietals, the mastoids, and the suprascapulse, goes past them all on the nape. 1 he mastoids interpose between the postfrontals and the parietals, so as to come in contact with the supraoccipital, and the parie¬ tals, but little developed, are pressed to the back part of the cranium, and in some instances wholly disappear. The suprascapula most frequently united to the mastoid by an immoveable suture, winch includes the parietal when that bone is present, and extends even to the supraocci¬ pital ; it gives out besides two processes, one of them resting on the exoccipital and basioecipital, or wredging itself be¬ tween them, and the other going to the first vertebra; sometimes a plate from the exoccipital supports that same vertebra. This vertebra, though it presents a pretty con¬ tinuous centrum beneath, is in reality composed of three or four coalescent vertebrae, as we ascertain by its diapophyses by the circular elevations of the neural canal and by the holes for the exit of the pairs of spinal nerves. There is great variety in the development of the various processes of the bones we have mentioned, and there is no less in the magnitude and connexions of the first three interneurals. In general, in the species which have a strong dorsal spine, the second and third interneurals unite to form a single plate, named in the Histoire des Poissons the “ buckler,” and which is usually more or less crescentic in shape ; the great spine is articulated to the third interneural, and there is only the vestige of a spine on the second inter¬ neural in form of a small oval bone, forked below, whose function is to act as a bolt or fulcrum to the great spine when the fish wishes to use it as an offensive weapon. The great spine itself is joined by a ring to a second spine which belongs to the third interneural. This articulation by ring exists in Lophius and a few other fishes not of this family. The first interneural does not carry a ray, and it varies much in the species whose helmet or casque is continuous with the buckler, as in many of the Bagri and Pimelodes. In these cases the supraoccipital, extending backwards, conceals the first interneural, passing over it to touch with its point the buckler formed by the second and third inter¬ neurals. In other instances, as in Synodontis and Auchen- ipterus, the supraoccipital and second interneural, forking and expanding, inclose and join themselvest o the fiist interneural, but leave a larger or smaller space in the middle of the nuchal armour which they contribute to form. When the point of the supraoccipital does not reach quite to the second interneural, the first interneural remains free from connection, and occasionally shows us a narrow plate, interposed between the other two ; in such a case the helmet is not continuous with the buckler. 1 he neural spines of the coalescent centra which form the apparently single first ver¬ tebra, concur also in sustaining the nuchal plate-armour and the first great dorsal spine ; they carry the interneurals, are joined to them by suture, and one of them is often inclined towards the occiput to assist in sustaining the head ; in fact, this part of the skeleton is constructed to give firm mutual support. _ . The scapular chain of the Siluroids is also formed to give the resistance to the strong weapon with which it is armed. The suprascapula, as we have said above, is often united by suture to the cranium, and it obtains support below by one or two processes that are fixed on the basioccipitais and exoccipitals, and upon the diapophysis of the first veite- bra: no scapula is ever present; it is between the two arms ICHTHYOLOGY. Classifica- 0f the suprascapula that the top of the coracoid is fixed, tion—Ma- jn most osseous fishes the coracoid completes the lower key lacopten. tjie scapUiar arch in joining its fellow by suture or syn- chondrosis without the intervention of the radius ; but in the Siluroids the radius descends to take part in this joint, and sometimes even to occupy the half of the suture, which is not unfrequently constructed of very deep inter¬ locking serratures. The solidity of this base of the pectoral spine is further augmented by the intimate union of the radius and ulna, which often extends to junction by suture, or even to coalescence; and these bones, moreover, give off two bony arches,—the first, a slender one arising from the salient edge of the radius near the pectoral fin, and going to the interior face of the ulna that is applied to the interior surface of the ascending branch of the coracoid ; this process is analogous to one in the Cyprinidce where it is a separate bone: the second and broader supplementary arch does not exist in the Cyprinidce, and is often perfora¬ ted by a large hole ; it also emanates from the same salient edge of the radius, but proceeds in an opposite direction to the inferior edge of the coracoid, a little before the in¬ sertion of the pectoral spine. These two arches give at¬ tachments to the muscles that move this spine; in the Synodontes and many Bagri, the upper arch remains in a cartilaginous or ligamentous condition ; while in Malap- terurus it is the lower arch that does not ossify, but both are fully formed in the Siluri and many other Siluroids more closely allied to that typical genus. The epicora- coid is also wanting in the Siluroids (Nos. 49, 50, figs. 10 and 15.) The pterygoid and entopterygoid (25, 24, id.), are reduced to a single bone, and so are the epitympanic and pretympanic : the mesotympanic (31) is wholly wanting, and the palatine is merely a slender cylindrical bone. The suboperculum is likewise constantly absent in all the Silu¬ roids. This long anatomical detail has been extracted from the Histoire des Poissons, because without it descriptions of this peculiar and interesting family could not have been understood. The Siluroids have no true scales, though some of them (Doras) have the lateral line armed with bony plates, and in others {Callichthys) these biserial plates are developed so as to incase the entire body. There are also varieties of external structure similar to those which occur in other large families of fishes, such as the different positions of the fins, and even the entire absence of certain of these members in some groups. Many of the Siluroids are fresh-water fishes which attain a great size, and they are what are called ground fishes, and remain habitually at the bottom of the pieces of water that they inhabit. In the genus Silurus, as well as in Pimelodus, the choroid vasoganglia and pseudo¬ branchiae are both absent. Silurus glanis, L., is the largest of European fresh-water fishes, and the only one of this extensive genus inhabiting the Continent. It is smooth, greenish black, spotted with black above, and yellowish- white beneath. The head is large, with six barbels. It sometimes attains the length of 12 or 15 feet, and the weight of 300 or 400 lbs. As this creature is somewhat unwieldy in its motions, it does not pursue its prey, which consists of small fishes, but lies concealed among the mud, and seizes such unwary stragglers as happen to come within reach. The fishermen of the Spree say that they always take the largest fish of this kind in a thunder-storm. In¬ sects are the best bait for the younger ones. It has occa¬ sionally been observed in the sea, but always near the mouths of rivers. Gronovius and Temminck both authen¬ ticate its occasional capture in the salt water. The flesh is fat and sweet, and its lard has been employed in some places as a substitute for that of the hog. Sir Robert Sibbald, at the conclusion of his list of river fishes, adds Silurus sire Glanis ; from which it has been inferred that this gigantic species may, at one period, have inhabited the Scottish 259 rivers; but this fish is a stranger to the waters of France, Classifica- Spain, and Italy, as well as to England, which furnishes a tion—Ma- strong argument against the conclusion that has been drawn lacoPten- from the sentence in Sibbald, unsupported as it is by any reference to accounts of its capture in Scotland. In fact, it is in the western European rivers that it is common, in the Elbe to the north, and the Danube on the south, and in the rivers still further west; and it is one of the fishes brought to the market at Constantinople. It occurs in the Scandinavian peninsula but rarely. In the rivers that fall into the Caspian it is very common, but it is a stranger to all the Siberian rivers which flow towards the Arctic Ocean. It is undoubtedly the Glanis of Aristotle. The Synodonts of all the Siluroids that possess an adi¬ pose fin are the most remarkable for the armature of the head and nape, as they are also for their peculiar dentition. They are either destitute of parietals, or these bones at an early period of the life of the fish coalesce with the supra- scapulae. The suprascapulae extend to the sides of the supraoccipital, but this latter bone goes still further back¬ wards to join the second interneural plate; embracing, in conjunction with it, the plate of the first interneural, as we have mentioned above. The process of the suprasca¬ pula which rests on the basioccipital descends lower, and expands into a thin plate, to which the anterior lobe of the air-bladder is attached. The ossicles of Weber are pre¬ sent in their usual form ; but the first parapophysis of the compound or coalescent anterior vertebral centra reaches forward between the suprascapula and exoccipital, and then sends a thin plate downwards into the air-bladder, in which it forms a diaphragm. The coracoids and ulno- radial bones, united below by suture, expand upwards in form of a vertical plate, which constitutes a bony diaphragm, dividing the branchial from the abdominal cavity, leaving a single opening for the passage of the oesophagus. Some species of Synodontis have been supposed to be the Nile fishes mentioned by Strabo, under the name of ypipo ^ specimen of the nest, spawn, and fish, exists in the College of Surgeons of London. Arges, Brontes, and Astroblepus, are three forms of Siluroids of exceeding interest. They are some of the small fishes which issue from tire bowels of the active vol¬ canoes of South America, and are carried into the plains beneath by the torrents of muddy water, which these moun¬ tains vomit forth. They issue from Cotopaxi, Tungurahua, Sangay, Imbaburu, and Cargueirazo, a phenomenon first properly communicated to the scientific world by the illus¬ trious Humboldt. They are expelled from craters or from lateral openings, always 16,000 or 17,000 feet above the sea, and the plains themselves into which these clayey streams descend, lie at least at half that height. Humboldt ascer¬ tained, by consulting the records of the neighbouring towns, that in 1691 Imbaburu threw out myriads of these fish in the neighbourhood of the city of Ibarra, and has continued to do so down to a late period. Cotopaxi also covered the estate of the Marchese di Salvategre with so large a quan¬ tity of these subterranean Siluroids, that the odour of their decaying bodies spread far and wide, so much so indeed, that the pestilential fevers which then prevailed were attributed to these putrid exhalations. In the eruption of 1698, when the peak of Cargueirazo fell in, vast quantities of these fish were brought down by the muddy and smoking streams which the mountain poured forth. M. Humboldt has pro¬ posed many questions bearing on these facts, without of¬ fering a solution. What streams of water, or what lakes exist in the cavernous recesses of these mountains ? How does it happen that water submitted to so high a tempera¬ ture retains air enough to support the life of such multi¬ tudes of fishes ? How do animals with flesh so soft escape being cooked as they pass far, and for a long time, through the smoke which envelopes the streams of mud that issue during the eruption ? These fish are called in the country prenadillas, a name not confined to a single species. The one that Humboldt specially described is the Arges cyclo- pum, originally named by him Pimelodus cyclopum. In Clarias the nape is not armed, and the development of the bones of the head is lateral; the suborbitars, which, in the rest of the family, are mere slender tubes, in this genus give extension to the helmet, and the supratempo- rals which, in most fishes are very small, and in the greater number of Siluroids are imperceptible, here become enor¬ mously large, and coalesce on the sides of the cranium, with the prefrontal, frontal, postfrontal, and mastoid. An apparatus for holding water in the vicinity of the branchiae exists in this genus, and its near allies analogous to that of the Anabasidce. The Clarias anguillans of Hasselquist has been by some writers on Egypt considered to be the Alabes of Strabo, cited by Archestratus, as one of the sa¬ cred fishes of the Nile. It is now known on the banks of that river by the name of Harmouth, or, as Sir Gardner Wilkinson writes the word, Karmoot. It was either wor¬ shipped, the latter author says, in the Theba'id, or was con¬ nected with one of the genii of the Egyptian Pantheon, who appears under a human form, with the head of this Fig. 85. Plotosus microceps. fish in the sculptures of the Diospolite tombs. In Lower 0 L 0 G Y. Egypt the Karmoot was caught for the table; but there is Classifica- no evidence of its having been eaten in the Theba'.d, which tion—Ma- may be an argument in favour of its sacred character. lacopteri. Plotosus is a genus of the Siluroid family which frequents the seas of southern Asia and the eastern coasts of Africa, and from thence southwards to Australia, where there are several species. One of these, PL microceps, is represented by the annexed woodcut, and the lips by figure 50. Aspredo differs greatly from the rest of the Siluroids, and from other osseous fishes, in the rudimentary and im¬ moveable condition of its gill-flaps, the three pieces that generally perform the office of a valve to the gill-openings being mere vestiges confluent with the preoperculum in such a way, that the opening and closing of the aperture does not depend on the tympanico-opercular apparatus. The mouth likewise is peculiar, the premaxillaries being articulated longitudinally, so that the orifice is a slit in the axis of the fish, with teeth in its posterior part only. Some curious sucker-like appendages are formed on the females at certain times by the expansion of pores and development of filaments on their edges. These are not found in the males. Bloch named a species Cotylephorus which had these organs, and McClelland has characterized a genus chiefly by their existence. Their presence, however, ap¬ pears to be temporal, and to extend to the females of all the species. Malapterurus electricus, Lacep. The electric powers of this fish were noticed by Adanson in 1756, but in Pur- chas’ Pilgrims, there is a much earlier account of it ex¬ tracted from the narrative of Baretus and Oviedo, dated 1554. It is there said, that there exists in the Nile a fish (called by Purchas a torpedo), which, if held in the hands, causes on the slightest movement a severe pain in all the arteries, nerves, and joints of the body. In the same work Richard Jobson is reported to have perceived in the River Gambia a fish like an English Bream, but thicker, which, on one of the sailors taking hold of, he instantly cried out that he had lost the use of his hands and arms. Another sailor, on touching the fish with his foot, felt his legs be¬ numbed. This was in 1620. As the iffa/flpterwms abounds in the Nile and in Senegal, and the torpedo has no resem¬ blance to a Bream, the former was doubtless the fish to which Purchas alluded, notwithstanding his use of the name Torpedo. Rudolphi1 has given a detailed description, with figures of the electric organs of this fish. In the great work on Egypt by Geoffroy (PI. XII., 2), there is the figure of a Malapterurus opened to show the viscera, but by a singular inaccuracy the fish is represented as scaly; now there are no scales whatever on this fish, and no fish known to possess electric powers has either scales or spines. 1 he Torpedo, the Gymnotus, and the Malapterurus, have all naked skins. The Tetrodon electricus is also destitute of spines on the skin, though all its congeners have skins as bristly as those of a hedgehog. M. Valenciennes, examining the electric organs of the Ma¬ lapterurus with a full knowledge of what had been previously observed by Geoffrey and Rudolphi, describes it as being composed of a thick layer of spongy cellular tissue, lying im¬ mediately under the skin, and framed of thin interlacing leaf¬ lets, filled with a gelatinous fluid, and lined on its internal face by a silvery aponeurosis to which it adheres strongly. This aponeurosis extends from the forehead and the gill- openings to the posterior end of the anal, and is divided into lateral halves by a membranous raphe that appears on the dorsal and ventral aspects. Under this aponeurosis run the great vascular and nervous trunks, whose branches pass through it, to be expended on the cellular tissue. 1 hen be¬ neath this aponeurosis there is a peculiar membrane which forms the subject of Rudolphi’s Memoir. It consists of at 1 Usher den Zitter-wels, Abh. Berl. Acad. vii. I C H T H Y Classifica- least six layers, readily separable the one from the other, tion—Ma- as well as from the subjacent muscles, to which it is attached lacopteri. mere]y by a loose and scanty cellular tissue. These apo- neurotic layers extend to the caudal. They are thin, dense and can be stretched under the finger; their external sur¬ faces become flocculent when they imbibe water. These flocculi resemble moist cotton, and when examined with a high microscopic power, present a felt-like interlacement of extremely minute fibrils. The tunics receive from their interior sides filaments of the same nerve (joar vagurn, Ru¬ dolph!) which runs under the aponeurosis. There are other filaments also of extreme tenuity, which penetrate the six layers to expend themselves on its interior surface ; these spring from the intercostals. In thus deriving the nervous energy of its electric organs from the “ vagus ” and from the “rami ventrales ” of the spinal nerves, as well as in possess¬ ing the cellular apparatus of the Torpedo and the laminated membranous one of Gymnotus, the Malapterurus com¬ bines the characters of these two genera in its peculiar organ. In the Edinburgh Philosophical Journal for ISdb^Mr Murray gives a good figure of a species of this genus from the Bight of Benin. I he Arabs, fully appreciating the na- tuie of the benumbing powers of the Malapterurus, name it Raad or Raasch (thunder). I he fish gives its discharge when touched on the head, but is powerless when held by the tail, and in fact the electric organ does not reach the caudal fin. In giving a shock it moves the tail however, as it must do when the muscles of the body are acting. A fish of only seven inches in length can give a vigorous dis¬ charge. The fish is eaten, and it is one of the most esteemed Siluroids as an article of diet. M. Valenciennes considers Trichomycterus and Eremo- philus as forming a link between the Siluroids and the Cy- pi'inoids, through Cobitis; indeed, he was long in doubt as to which family they actually belonged, and he has been led to assign them a place among the Siluroids chiefly by the absence of subopercula. I he want of an adipose fin weighed less with him, as this member is wanting also in some Silu¬ roids; neither does he consider the absence of ventrals of sufficient importance to exclude a genus from a family group. Trichomycteri were found by Mr Pentland in the rivulets which fall into that vast alpine sheet of water, Lake Titicaca, which is frequented by the Cyprinoid Orestias, also an apodal, and in the affluents of the Apurimac, one of the sources of the Amazon. He discovered them also in Rio de Guatanai, Rio de Pontezualo, and in Lake Compu- cila, on the Andes, to the west of Cuzco, and at an elevation of 14,000 feet. Eremophilus inhabits the waters of the Valley of Bogota, 8500 feet above the sea level. Family XVIII.—SILURID^E, Agass. Skin naked, or covered with bony shields, without scales. Pre- maxillaries forming the border of the upper jaw, the maxillaries being reduced to mere vestiges, or elongated into barbels ; all have barbels; suboperculum wanting. Epicoracoid wanting, or reduced to a mere process of the coracoid. The postfrontal or temporal ap¬ paratus has two ossicles less than in most osseous fishes; the pseudo¬ branchiae are wanting. The swim-bladder is present in the majo¬ rity, and is connected by a chain of ossicles with the acoustic organ; no pancreatic caeca; stomach cascal. In most the first pectoral ray is very strong and serrated; most have an adipose fin upon the back. Brauchiostegals nine to eighteen. ANALYTICAL TABLE OF THE SILURIDjE (Dura.) Dorsal, single (Siluroides, Dum.) Dorsal, containing bony rays. Dorsal extending along the whole back, Clarias 33. Dorsal short, with Its spinous ray close to the skull Trachelopterus 24. Its spinous ray on the back. Caudal forked Schilbes 2. Caudal rounded Brontes 31. 0 L 0 G Y. 261 Dorsal sustained by branching rays. Eyes lateral. Eyes conspicuous f...SlLURUS Eyes scarcely visible Cetopsis Eyes on the dorsal aspect. Tail slender, tapering, trenchant AspredO Tail tapering little Saccobranchus Dorsal on the tail, without bony rays Malapterurus Dorsals two (Dipteronotes, Dum.) Second dorsal with bony rays united to the caudal. Head protected by a bony helmet Chaca Head clothed with soft skin Plotosus Second dorsal with one bony ray, not united to the caudal. Head helmed ; body cuirassed ; barbels...Callichthys Second dorsal destitute of bony rays ,• body naked. Snout elongated. Snout round; lateral line keeled, 1 spinous ! j Doras Snout broad, flat, arched. Eyes lateral, level with the nos- ) „ trils J Platystoma Eyes depressed below the nostrils...HypophthalmuS 25. Snout short. Head covered by a bony helmet. Dorsal long ; body very long Heterobranchus 34. Dorsal long; body abbreviated Synodontis 27. Dorsal short; barbels Bagrus 4. Dorsal short; no barbels Silundia 9. Head naked. Caudal round at the end Pimelodus 16. Caudal forked. Barbels more than four Galeichthys 7. Barbels two only Diplomystax. Barbels none Ageneisosus 26. Obs.—Dumeril includes Arius, No. 13 ; Phractocephalus, No. 5; and Pangasius, No. 8, under the genus Bagrus, No. 4 ; and he omits from his table Astroblepas, No. 32, and 'Eremophilus, No. 43, together with several other genera characterized by Valenciennes. His genus Diplomystax is founded on Ariuspapillosus and A. raninus of the Histoire des Poissons; and he has instituted a genus Conosto- mus for the reception of the Pimelodi that have elongated conical muzzles terminated by a small mouth ; and which have moreover very small adipose fins. Macrones, another of his genera, embraces several Bagri with long slender muzzles, and an adipose fiu longer than the anal, together with a very long scaleless body. Genus I. Silurus, Linn. Dorsal short on the fore part of the back, without sensible spines; no adipose fin; a long anal. Raduli- form or card-like teeth on the jaws, and a band of vomerine ones behind the premaxillaries. Some have four barbels, and some only two. Sixteen species. Genus II. Schilbes. A strong, denticulated dorsal spine, ele¬ vated nape, broad depressed head, greatly compressed body, and very distinct teeth. Barbels eight. Branchiostegals eight to ten. Genus III. Cetopsis, Agass. Eyes almost imperceptible, being nearly covered by skin. Six barbels. One dorsal composed of soft rays. Convex, obtuse, truncated head ; moderate mouth ; single row of teeth on the mandible and front of the vomer; a band some¬ times on the premaxillaries. Gill-opening a small hole; branchio¬ stegals ten. Genus IV. Bagrus, Cuv. and Valenc. (Mystus, Artedi.) A rayed dorsal with spine, and an adipose one; a pectoral spine. A band of villiform or card-like teeth on the premaxillaries, behind which, on the roof of the mouth, there is a second arched villiform ! band, or a single row of teeth, not separated in the middle. They are divided into groups according to the number of their barbels, and subdivided by the forms of the head, the lengths of the adipose or anal, and variations in their dentition. Sixty-one species are de¬ scribed in the Histoire des Poissons. In Bagrus fllamentosus the air- bladder is divided by a septum, in which there is no opening; and in other species, the lateral compartments are subdivided by trans¬ verse septa. Genus V. Phractocephalus, Agass. (Siraraci, Spix.) Incom¬ plete osseous rays, encased in the upper border of the adipose fin. A flat head, with a deeply sculptured bony casque ; and an expanded transversely oval shield before the dorsal, free, and altogether de¬ tached from the bones of the skull. Nine branchiostegals; six barbels round the mouth. Genus VI. Platystoma, Agass. (Sorubim, Spix.) Snout de¬ pressed. Branchiostegals numerous. A transverse band of teeth, but more completely divided by the smooth median line of the vomer into two plates on each side, than in the Bagri. Thirteen species. Genus VII. Galeichthys, Valenc. Head rounded, skinny, Classifica¬ tion—Ma- 1. lacopteri. 37. 35. 40. 38. 36. 29. 28. 2G2 ICHTHYOLOGY. Classifica¬ tion—Ma- lacopteri. and without a conspicuous casque. First dorsal ray elongated into a flat cutaneous filament. The palatine teeth a narrow band divided by smooth lines into four patches. Branchiostegals six; four or six barbels. Five species. Genus VIII. Pangasius, Valenc. Four short barbels; no prolongations of the fin rays. Ten hranchiostegals. Air-bladder divided into four parts by three contractions. One species. Genus IX. Silundia, Valenc. A small smooth head, like that of Schilbes. Very small adipose fin; long anal. Only two small (maxillary) barbels ; teeth of the jaws hooked, and longer than in other Siluridce; a transverse hand in front of the roof of the mouth, as in Bagrus. Twelve hranchiostegals. Two species. Genus X. Sciades, Miill. and Trosch. A cross hand of palatine teeth, and behind them two clusters. Genus XI. Ariodes, Mull and Trosch. Palatine teeth forming two separate patches, and sometimes farther hack a single tuft only. Genus XII. Eutropius, Miill. and Trosch. One confluent hand of teeth on the vomer and palatines. Head small; nape high: the head and adjoining part of the body compressed near the dorsal aspect. Tail long and high, strongly compressed. Anal long; adi¬ pose fin very small. Genus XIII. Arius, Valenc. Teeth on the roof of the mouth disposed in two widely-separated plates, supported fcr the most part by the palatines only, but in some species encroaching on the angles of the vomer. Branchiostegals five to eight, rarely ten to twelve. The teeth may he villiform or pavement-like, the passage to the pavement-like teeth being gradual; some species have the ordinary nuchal armour of a triangular (interparietal, Cuv.) supra- occipital plate, with the apex truncated, and a small crescentic interspinal plate; others have a very large separate supraoccipital disk, and the barbels vary in number. On combinations of these diversities of structure several groups are established in the Histoire des Poissons, in which fifty-one species are described. Air-bladder in some divided lengthwise into two separate sacs. Genus XIV. Osteogeneiosus, Bleek. A rayed and an adipose dorsal fin. Conical, acute, curved, crowded teeth on the premax- illaries, and mandibles in many rows; palatine teeth in two oblong arched plates in the fore part; the mesial line of the roof of the mouth smooth; eyes far hack. Two premaxillary barbels, bony and rigid. Branchiostegals five. Head cuirassed; gill-openings extremely narrow. Indian Archipelago. Genus XV. Batrachocephalus, Bleek. Dorsal fins two, the hinder one adipose. Thick, cylindrical, premaxillary and mandibu¬ lar teeth in many rows; vomer and mesial line of the roof of the mouth smooth; a few crowded cylindrical teeth on the anterior angles of the palatine bones; eyes above. Head cuirassed; no barbels. Five branchiostegals. Indian Archipelago. Genus XVI. Pimelodus, Lacep. Roof of the mouth smooth, edentate. Barbels six or eight. Some species want the casque; others possess it; it is sometimes continuous with the buckler of the first osseous ray of the dorsal; sometimes distinct and not continu¬ ous. Forty-three species are described in the Histoire des Poissons. The following two genera have been published since the date of that work :—- Genus XVII. Rita, Bleek. Dorsals two, the posterior one adipose. Conical teeth in the upper jaw pluriserial; mandibular teeth conical in the anterior rows, granular in the posterior ones; vomerino-palatine teeth granular, disposed in two oblong patches in the fore part of the palate. Branchiostegals eight or ten ; barbels six, fleshy, belonging to the nose, premaxillaries, and mandible. Ventrals eight-rayed. (Arius rita, Cuv. and Valenc.) Genus XVIII. Bag arius, Bleek. Dorsals two, the posterior one adipose. Barbels eight, on the jaws bony, rigid ; upper jaw teeth pluriserial, acute, placed in a curved quadripartite band; mandibular teeth biserial, with an interior series of canines at the symphysis only ; no teeth on the vomer, palatines, or entoptery- goids. Branchiostegals twelve. Rays of the ventrals six. No air- bladder. Genus XIX. Euanemus, Miill. and Trosch. Narrow gill- openings. Body laterally compressed. Cranium covered with skin. Card-like teeth in one band on the upper and under jaw; none on the vomer or palatines. First ray of the dorsal and pectoral fins spinous; dorsal fin wholly anterior and small; a very small adipose fin ; rays of the ventrals much more numerous than in other Siluridce. Eyes covered with skin. Barbels six. One species H. columbetes. Genus XX. Ketengus, Bleek. Dorsal fins two, posterior one adipose. Cuneiform uniserial teeth on the premaxillaries and mandible; vomer and palatines smooth. Head cuirassed ; eyes superior. Five branchiostegals; four fleshy barbels. Strait of Madura. Genus XXI. Calophysus, Miill. and Trosch. No palatine teeth; a row of stronger teeth on the upper jaw and mandible, behind which, on the one or the other, a row of smaller teeth. The end of Classifica- the first dorsal and pectoral ray simply jointed, not denticulated ; tion—Ma- a long adipose fin. Six barbels; narrow gill-opening; seven lacoptkrh branchiostegals. A very small swim-bladder, which is bordered behind with an elegant fringe of caecal processes. Two species. Genus XXII. Erethistes, Mull, and Trosch. Narrow gill- openings. Head big, broad, pointed anteriorly, rough. Besides the occipital process there is always another like it. The scapular girdle has a long bony process above the pectoral, and another beneath it; mouth small. Card-like teeth in the upper and under jaw ; none on the palatines. A moveable spine forming the first ray of the dorsal and pectoral fins ; an adipose fin ; anal small. Genus XXIII. Auchenipterus, Valenc. Siluroid with an adipose fin. Head small; teeth almost imperceptible. Branchi¬ ostegals five ; no teeth on the roof of the mouth. Dorsal very far forward, or on the nape. Casque united by suture with the dilated bucklers of the first and second interspinals covering the nape to the dorsal, as in Doras and Synodontis. Seven species. Genus XXIV. Trachelyopterus, Valenc. Ab adipose fin, yet allied to Schilbes and Pimelodus. Barbels six. Villiform teeth on the jaws, none on the roof of the mouth. A solid, osseous casque, united, as in Auchenipterus, and coming near the dorsal, owing to the shortness of the supraoccipital plate, and the completely obsolete chevron. Pectorals attached under the throat. One species. Genus XXV. Hypophthalmus, Valenc. An adipose fin. No teeth; eyes near the ventral aspect. Fourteen branchiostegals. Dorsal fin small, well back, with a bony ray ; a strong ray in the pectoral also; ventrals small; anal long. Six barbels. Three species. Genus XXVI. Ageneiosus, Lacep. Maxillary barbels only, and very short; in one species denticulated and resembling horns. Eyes depressed as in Hypophthalmus. Branchiostegals eleven. A bony ray in the dorsal and pectoral; a moderately long anal. Three species. Genus XXVII. Synodontis, Geoffroy St Hilaire. Remarkable among the Siluroids having an adipose fin, for the arming of the head, which shows much affinity with that of Auchenipterus and Doras. Supraoccipital plate large, united by a long transverse suture with the greatly dilated interneural buckler, which is further prolonged along the base of the dorsal by its junction with three interneural plates; very wide strong pointed coracoids attached to the suprascapulars which form the lateral angles of the helmet. Enormous strongly-toothed pectoral spines; a high pointed and trenchant dorsal spine. Snout short, terminated by the nasal which supports very small premaxillaries covered with finely villiform teeth. Mandible composed of two short slender limbs, and carrying in front a bundle of teeth that, individually, are very thin lancets, each supported on a stalk as fine as a hair, and terminated by a small recurved and gold-coloured hook. This dentition resembles that of Salarias. Genus XXVIII. Doras, Lacep. Pimelodi with the lateral line cuirassed by keeled bony plates, each ending in a spine. Head armed as in Auchenipterus, and the coracoid similarly formed. Ihe very thick dorsal and pectoral spines are strongly toothed. In some the snout is depressed, and the mouth at its extremity is furnished with two broad villiform bands of teeth on the jaws; in others, the mouth is a round hole under a conical snout, and having small groups of mandibular teeth only. Ten species. Genus XXIX. Callichthys, Linn., Gronov. Pimelodt cuirassed on the lateral line like the Doras, and with an adipose fin; but the lateral shields are narrow, embrace the whole height of the fish, and form two rows, somewhat tiled and crossing in the middle. Head covered with a helmef; mouth small, almost toothless; twobaibels at each corner of the mouth. Three branchiostegals. Dorsal and pectoral spines often feeble. No air-bladder ; intestine frequently doubled back ; stomach globular and small. Ten species. Genus XXX. Arges, Valenc. Teeth bifid, and slightly curved at the points, ranged in rows on the jaws and producing a sort of harrow which no other Siluroid, nor any other fish, is known to possess. Roof of the mouth smooth and edentate ; two maxillary barbels, and papillae at the nostrils. First dorsal small, with a weak ray in front; adipose fin long; ventrals well forward. Four branchiostegals. Two species. Genus XXXI. Brontes, Valenc. An Arges without the adi¬ pose fin. No casque. Eyes, two minute points on the top of the head. Branchiostegals four. One species. Genus XXXII. x\stroblepus, Humb. An apodal resembling otherwise, externally, Brontes; having a depressed head; eyes above. A single dorsal; no adipose fin. First rays ending in filaments. Four branchiostegals. One species. < Genus XXXIII. Clarias, Gronov. Helmet extending to the temples and cheeks; the supraoccipital point more or less rounded, in some semicircular. Nape exposed; no predorsa uc er. Teeth on the jaws and arc of the vomer. Head depressed, obtuse. Body long; caudal truncated. Anal long and low; dorsal without ICHTHYOLOGY. 263 Classifica¬ tion—Ma- lacopteri. a spine running along the whole hack ; its posterior half sometimes replaced by an adipose fin. Pectoral spine small. Branching ap¬ pendages for holding water attached above the branchiae; air- bladder divided. Fourteen species. Genus XXXIV. Heterobranchus, Geoff. Dorsal shorter than in Clarias, the rest of the back being occupied by an adipose fin; caudal rounded. Head broad and flat; supraoccipital process of the helmet rounded. Short, fine, crowded villiform or bristle-like teeth on the jaws and arc of the vomer; a complex suprabranchial apparatus. Six barbels. Three species. Genus XXXV. Saccobranchus, Valenc. Helmet like Clarias Heterobranchus. Villiform teeth on the jaws, and two arched dental plates on the vomer ; a complex suprabranchial apparatus. Small dorsal far forward; long anal. Seven branchiostegals; the branchial reservoir different in form from that of Clarias ov Hete¬ robranchus. Eight barbels. One species. Genus XXXVI. Plotosus, Lacep. An elongated body, ending in a compressed pointed tail. Xo hard helmet, the smooth rounded depressed skull being covered with soft skin. Lips fleshy; strong conical teeth on the jaws ; pavement-like teeth on the vomer ; eight barbels. A short, higher, anterior dorsal, and a long, low, posterior one, uniting with the long anal at the point of the tail, without a distinct caudal. Small trenchant, toothed and pointed dorsal and anal spines; a cauliflower-shaped tubercle in a funnel behind the anus, of unknown use, existing in addition to the genital tubercle at the external opening of the seminal deferent canal. Nine species. Genus XXXVII. Aspredo, Linn. Differ from other fish in the gill-covers being fixed and without motion, there being merely vestiges of the three opercular pieces, soldered to the preoperculum. Mouth peculiar, the premaxillaries being articulated longitudi¬ nally under the snout, and carrying teeth on their posterior edge only; and the maxillaries ending in barbels, articulated to the nasal anterior to the premaxillaries. Head flat, anteriorly. Body naked, wide at the pectoral region, tapering into a long slender tail, tren¬ chant beneath, and terminated by a distinct small caudal. Dorsal small, high ; strong, flat, serrated pectoral spines ; anal long ; no adipose fin; cup-shaped suckers on the ventral surface at certain times. Branchiostegals five. Six species, all American. M‘Clel- land describes five Indian fish belonging to a genus named Glyp- tosternon, which does not seem to differ from Aspredo in the cha¬ racters that he assigns to it. Genus XXXVIII. Chaca, Valenc. Head broad and much de¬ pressed, as wide before as behind, thus being quadrangular; tail ta¬ pering and much compressed at the end. Two dorsals and two anals; posterior ones uniting to form a caudal at the extremity of the tail, or it may be said, caudal running forward on the dorsal aspect to above the front of the anal, and about half as far on the ventral aspect, in which point of view there would be one anal and one dorsal near the head, supported by a strong osseous first ray. Serrated pec¬ toral spines. The chin cirrhated by eight filaments. Air-bladder very large, composed of two lobes separated by the spinal column. Genus XXXIX. Sisor, Hamilt. Buch. A Hypostomus without lateral pieces of mail, its skin being soft; remarkable for the size of its premaxillary barbels, and the prolongation of the upper caudal ray into a filament as long as the rest of the fish. Body slender, long; the chevron in front of the dorsal three-lobed. Mouth edentate, with fourteen barbels in all. Large gill-openings; four branchiostegals. One species, which attains the length of seven feet. Genus XL. Malapterurus, Lacep. No anterior dorsal; an adipose fin near the caudal; ventrals beyond the middle of the fish; and an anal occupying about half the distance between them and the rounded caudal; no pectoral spine. Body shaped somewhat like that of a Cobitis or Galaxias, the tail being thickish, but the head is conical and ends bluntly. Lips fleshy, with six barbels; fine villiform teeth on each jaw ; none on the vomer. A short ob¬ lique gill-opening; branchiostegals seven. Stomach small, siphonal; air-bladder fusiform, pointed posteriorly wTith two globular lobes in front, in advance of the ossicles of Weber. Its outer coat is thick and spongy. A double electrical organ. Genus XLI. Ailia, Gray. A long, greatly compressed, mode¬ rately high fish, with a small head and rounded snout like a Schilbes. Back naked, except near the tail, where there is a small adipose fin; a very long, even anal, and forked caudal. Eight barbels. Teeth on the jaws and roof of the mouth minute. Genus XLII. Trichomycterus, Valenc. Allied to Malapte¬ rurus by general form, the depression of the head, thinning of the snout, and construction of the cranium, but distinguished by a dorsal placed in the middle of the back, the absence of an adipose fin, and the want of an air-bladder. Branchiostegals eight. Aspect considerably like that of Cobitis. Six barbels, one at each anterior nostril, and a pair at the corner of the mouth on each side. Tail thickish. Fine curved teeth in a band on the jaws; palate smoothed. Three species. Genus XLIII. Eremophieus, Humb. Closely resembling Trichomycterus in general aspect, but apodal; connected like that Classifica- genus to the Siluroids by the absence of subopercula; and to Cobitis tion—Ma- by the want of ventrals. Jaws armed by a band of long villiform or lacopteri. bristle-like teeth. Branchiostegals eight; no scales. Siphonal v ^ ^ stomach and long intestine; no air-bladder. GONIODONTS. This family has grown out of the genus Loncaria of Linnaeus, which, as characterized by him, consisted of fishes whose bodies were mailed in hard angular plates or scales, distinguished from Doras and Calhchthys by the mouth opening under the snout. Muller considers them to be a separate group of the Siluroid family, and as such they are described by Valenciennes, in the Histoire des Poissons. Lacepede divided the Linnaean Loricarice into two groups, reserving that appellation for the species that have no adi¬ pose fin, and giving the name of Hypostoma to those that have a kind of adipose fin but one that is preceded by a hard bony ray. Agassiz, when characterizing and naming the family, adopted Lacepede’s generic divisions, and added two others, Rhinelepis and Acanthicus. The premaxillary and mandibular teeth of the Goniodonts are composed of albuminous tissue, like the teeth of the Chaetodons, and have the same elasticity. In the Loricariee the top of the skull is prolonged hack- wards by the extension of the supraoccipital, which forms a kind of first scale, that reaches to the two plates developed from the points of the interneurals of the first compound vertebra,—the second of the plates being the chevron, on which the spine of the dorsal stands and moves. The mas- toids and suprascapulae enlarge the sides of the skull, and form the wide osseous vault, which affords the necessary space and breadth for containing the anterior portion of the abdominal viscera. The diapophyses of the great compound vertebra are plates curved like a sabre, and are supported below by the centra, and above by a styloid process resting on the vertical occipital crest. The scapular arch is very strong and shuts up the fore-part of the abdomen by a bony septum, while the coracoids, in form of the letter V, give the firmness necessary to sustain the dermal shields and spines. The eoalescent radius and ulna bent horizon¬ tally support the pectoral plates. There are only eight abdominal vertebrae, with ribs as fine as bristles, and sixteen caudal ones. Family XIX.—GONIODONTIDA3. Goniodontes, Agass.; Loricarini, aliorum. Related to the Siluridce, hut differing from them in possessing pseudobranchiae, and in their intestines. Head and body mailed in hard, angular plates; orifice of the mouth on the ventral aspect under the snout, and bounded by the premaxillaries and maxillaries; long, slender, flexi¬ ble teeth ending in hooks on the premaxillaries and mandible, which are separated at the symphysis ; a broad, circular, cuticular fold surrounds the mouth. Gill-cover mostly immoveable ; the sty¬ loid epicoracoid absent as in the Siluridce, and represented by a process of the coracoid. The heart lodges in a bony capsule formed by the coracoid. No caecal enlargement of the stomach ; intestine long, frequently bent; no pancreatic caeca. Swim-bladder want¬ ing, in which they differ from the Siluridce. There is much phos¬ phate of lime in the scales. Genus I. Loricaria, auct. Body depressed, broader than high. Tail very much compressed. Teeth in both jaws. A single dorsal and no adipose fin. Genus II. Hemiodon, Knor. Body very much depressed. Teeth on the mandible only. Premaxillaries rudimentary ; tooth¬ less. Genus III. Acestra, Knor. Body elongated, nearly cylindri¬ cal. Teeth in both jaws, furnished with a tranverse radical process. Dorsal and anal fins opposite. Genus IV. Rhinelepis, Agass. Osseous plates resembling scales, imbricated, rough like a file. A short thick body. Lower lip often dilated into a membranous velum, and fringed with filaments. Three branchiostegals. Hooked teeth surrounding the orifice of the mouth in rows; the front ones notched at the point. A single dorsal. Three species. I & 264 ICHTHYOLOGY. Classifica- Genus V. Acanthicus, Agass. Articulated spines on the tion—Pha- snout, cheeks, and gill-covers, like those of a hedgehog. Osseous ryngo- plates on the body, crested and spinous ; distinct squamiform gnaths. bucklers on the belly. Teeth with a double curvature, arranged i r ^ like those of Rhinelepis ; mouth encircled by a complete velum. A single dorsal. Genus VI. Hypostomus, Lacep. Second dorsal analogous to an adipose fin, having an osseous ray in front. Body thick and short. Head especially large. Bony armour, like that of Loricaria, on the body. A large first dorsal opposed to the ventrals and anal. Pec¬ toral spine rough, long, and strong. Branchiostegals three. Seven species. Order III.—PHARYNGOGNATHS. This order is founded on the character, common to all its members, of the lower pharyngeals being united to form one bone. In external aspect there is no similarity between the families of Scomberesocida and Labridce, which belong to it. Order III.—PHARYNGOGNATHI, Mull. Endo-skeleton ossified; exo-skeleton in some as Cycloid, in others as Ctenoid scales; inferior pharyngeal bones coalescent. Swim- bladder without an air-duct. Ventral fins in some on the thorax, in others on the abdomen. Sub-Order I.—MALACOPTERYGII. Fins without spines. SCOMBERESOCIDA3. Of this group of Pharyngognaths we may obtain a correct notion from the Garfish or Greenbones of our coasts, named also by the fishermen Mackerel Guides, because they an¬ nually come into shallow waters at the time of the Macke¬ rel fisheries. This fish belongs to the genus Belone which contains many species, and among others B. caudimacula and B. cancila, which inhabit the fresh waters of the penin¬ sula of Hindostan, and afford an instance, in addition to many others, that generic assemblages are independent of habitat, as to the species being marine, lacustrine, or fluvia- tile. The British seas furnish an example of the genus Scomberesox, also, in the Saury Pike or Skipper. The lat¬ ter name is given in consequence of the habit these fishes have of leaping out of the water, which is also practised by the Belones. Some species of this genus have an air-blad¬ der, while others want it; a remarkable peculiarity in fishes so similar in aspect, but which also occurs among the Mackerel. The Exocceti or Flying Fishes have ever been an object of great interest to navigators. The monotonous and quiet voyage of a ship running before the trade-winds is enlivened by the flights of large bands of these creatures rising before the bows of the vessel, and like a flight of larks or sand¬ pipers glittering in the sun, and often by a simultaneous impulse, changing the direct line for one nearly at right angles, before settling in their native element again. The muscular force by which this progress through the air is effected has engaged the attention of Humboldt. This illustrious and accurate observer states that the Flying Fish move by myriads constantly in a right line, and in a direc¬ tion opposite to that of the waves. He doubts whether this flight be generally assumed as a means of escape from voracious fishes, and with reason. As we have noticed above, their near allies the Belones and Scomberesoces have the habit at certain times of leaping frequently from the water, and we have observed the same thing to occur in the spawn¬ ing season among the shoals of Malloti, which often land themselves in numbers on the dry beach. There seems to be something in the constitution of these fishes which im¬ pels them to this movement, and the Exocceti are organized to carry it to the fullest extent by the size of their pectoral Classifica- fins and the power of the muscles which move them. There tion—Pha- are some who assert that the flight of the Exocceti is a mere rynS0- leap, resembling the ricochet of a stone skimming along the v gDat1*8- ^ surface of the water, but the pectorals are certainly impelled * against the air in the course of the flight. The bands fre¬ quently undulate in their height above the water before subsiding into it again; and, as mentioned above, it is not rare to see them change their direction, though this is not done till just before the termination of their aerial course. Their flight is rapid, greatly exceeding that of a ship going 10 miles an hour, and we are not inclined to limit it to a distance of 500 feet. It is not easy to form a correct judg¬ ment of distance under such circumstances; but having often watched their flights when in a frigate 120 feet long, it appeared to us to exceed the length of the ship many times, and its altitude was such that in the night they fre¬ quently fell on board. Many shoals, consisting entirely of small ones, from 2 to 3 inches long, showed a smaller power of sustaining themselves in the air, and more fre¬ quently glanced against the summit of the coming wave, but the larger kinds rose vigorously into the air. Family I.—SCOMBERESOCID^E, Mull. Maxillaries coalescent with or adherent to the elongated pre- maxillaries at the corner of the mouth, under the nasal, and co¬ vered in part or wholly by the preorbitar scale bone. Genus I. Belone, Ouv. Upper border of the jaw formed by the premaxillaries, which, together with the mandible, are elon¬ gated into a long bill; teeth on these hones forming a narrow stripe, the interior row consisting of taller conical ones; roof of the mouth smooth (except in the species which frequents the Chan¬ nel) ; two small patches of teeth in the upper pharyngeals, more pointed than those on the lower pharyngeals, which are short, conical, inclining to the pavement form. Gill-openings large; branchiostegals, twelve. A hard helmet, formed of the cranial hones, is variously sculptured and furrowed. Body elongated. Scales very thin, like those of Scomber, and not easily perceptible, except one row of keeled ones on each side. Dorsal and anal op¬ posite each other, and far back. No pyloric caeca; large air- bladder. Twenty-six species. Genus II. Scomberesox, Lacep. ; Sairis, Rafin. Jaws con¬ structed nearly as in Belone, but the mandible is always the longest, and the maxillary, instead of being confluent with the pre¬ maxillary, is merely in apposition; the teeth are extremely small, and uniserial on the jaws ; none on the roof of the mouth or tongue. Shape of the body much as in Belone. Dorsal and anal far back, opposite to one another, and followed by detached finlets of vari¬ able number, according to the species. A scaly keel, as in Belone, but which becomes obsolete near the anal, and does not reach the caudal. No pancreatic caeca ; the air-bladder present in some spe¬ cies is wanting in others, as in the species of Scomber. Five spe¬ cies. Genus III. Hemiramphus, Cuv. The distinctive character of this genus is expressed by the name, and consists in the edentate, pointed projection of the mandibular symphysis, producing a kind of half bill. The upper jaw is formed by the premaxillaries sol¬ dered together, and the maxillaries joined to them at the angle of the mouth widen and form a spur which is concealed by the pre¬ orbitar. A narrow band of small granular teeth exists in both jaws. In other respects these fishes resemble Belone, and as in that genus, the intestinal canal is straight, without pancreatic caeca. The air- bladder runs the whole length of the abdomen, between the spine and a tense arch of the peritoneum ; and in the species (three) which M. Valenciennes examined, he found its structure cellular, similar to that of Amia. Thirty species. Genus IV. Exocletus, Linn. (Sub-Family, Exoceetini, Bonap.) Recognizable at once by the large pectoral fins that are capable of being used as wings or parachutes. Head and body scaly, with a scaly keel on each flank. Head flattened above and on the sides. Dorsal opposite the anal. Eyes large. Premaxillaries without nasal pedicels, forming the border of the upper jaw; maxillary not soldered to the premaxillary, but having nearly the same posi¬ tion as in Belone, and gliding under the preorbitar ; jaws armed with small pointed teeth, composed of osteo-dentine, and the pha¬ ryngeals with crowded teeth, having compressed crowns and several cusps, like those of Cuprinodon, Acanthurus, and other genera. Branchiostegals ten to twelve. Intestine straight, without pyloric ICHTHYOLOGY. 265 Classifica- caecaj upper lobe of the caudal shorter than the other; air-bladder tjon pha- large) closed. Thirty-three species. Some have barbels, and have ryno-o- keen made the types of separate genera, gnaths. CHROMIDIDiE. This family is included by Muller among the Pharyngo- gnaths with spinous rays in the fins. It is not treated ofin the Histoire dcs Poissons, and the generic characters in the table are from Cuvier’s Begne Animal, or from Riippell’s works. The members of this group agree with the Ctenoid Labroids in having only one nostril to each nasal sac. large tooth arched backwards, and then follow some more card- Classifica- like teeth. Branchiostegals, five. tion—Pha- Genus II. Amphiprion, Schneid. Body oval, compressed, ryngo- A single dorsal. Lateral line terminating under the end of the gnaths. dorsal. Head obtuse ; uniserial, small, conical, obtuse teeth on the v > jaws ; palate edentate. Five branchiostegals. Preoperculum, oper¬ culum, suboperculum, and interoperculum denticulated strongly, and striated on their surfaces. Air-bladder simple. Sixteen species. Genus III. Premnas, Cuv. Form that of an Amphiprion, with interrupted lateral line, and obtuse uniserial teeth, but the oper¬ cular pieces are less strongly toothed, and the suborbitar scale- bones much more armed, producing under the eye one or two large spines pointing backwards. A few denticulations exist on the as¬ cending edge of the preoperculum, and on the border of the sub- Sub-Order II.—ACANTHOPTERYGII. Family I.—CHR0MIDID2E, Bonap. Chromides, Mull. Lateral line interrupted. Teeth villiform. One dorsal. A single nostril to each pituitary sac. Genus I. Ohromis, Cuv. General aspect of Labrus, with their lips, protractile premaxillaries, pharyngeal bones, and the filaments of their dorsal rays ; but the entire caudal and the soft dorsal and anal to a considerable height are scaly. Their teeth are disposed in two card-like bands on the jaws and pharynx, with, in front, a row of conical teeth. Branchiostegals six. Lateral line ceasing under the dorsal, and not recommencing on a lower level. Stomach cmcal; two pancreatic cmca. The J]olti of the Nile has no pan¬ creatic caecum, but its stomach is caecal. Its dentition is that of the Mediterranean species. Genus II. Cychla, Bloch, Schneid. Have the body more elon¬ gated than Chromis, and their teeth in a broad band, and wholly villiform. J Genus III. Sarotherodon, Rupp. General habit of Chromis. Both jaws armed with an outer row of slender chisel-shaped teeth, smaller at their insertion, wider at their edges, behind which a band of brush-like teeth. Palatines and tongue unarmed; at the pharynx fine brush-like teeth, on a single three-cornered plate be¬ low, and two roundish transverse plates above. Four gills. Oper- cula without scales ; pretty large scales on the body. Lateral line interrupted. A dorsal fin extending along the whole back, two- thirds of it supported by spines ; three spines in the anal; ventrals behind the pectorals. Guinea coast. operculum ; but the opercular pieces are not strongly streaked on the surface, as in Amphiprion. Stomach globular, small; three pancreatic caeca; large globular air-bladder. Three species. Genus IV. PoMACENTRUS,Lacep. Form oblong. Head obtuse; incisorial uniserial teeth. Preoperculum denticulated; operculum entire on the border, and without spines; suborbitars often toothed. Lateral line ending under the soft portion of the single dorsal; four or five branchiostegals. Twenty species. Genus V. Dascyllus, Cuv. Resembling .Powiaceutrtts, but the teeth, instead of being trenchant, are in a villiform band, with stronger conical ones in the outer row. Three species. Genus VI. Glyphisodon, Lacep. Having a strong resemblance to Pomacentrus, but the preoperculum is not denticulated. Body compressed, oval, covered as well as the head with large scales. Profile rounded. Mouth small ; teeth on the jaws only, uniserial, close together, narrow and straight, trenchant at the crown, and often notched. Lateral line ending under the end of the dorsal. For the most part thirteen dorsal spines (rarely twelve), each with a membranous filament at its tip; two anal spines (rarely three). Stomach very large, cmcal; three thick pancreatic cmca; ovaries discharging by a tube behind the anus. Thirty species. Genus VII. Etroplus, Valenc. Oval compressed form of Gly¬ phisodon. Eye more elevated than in that genus, and the suborbi¬ tar scale-bone large and not scaly. Snout also destitute of scales. Dorsal (seventeen or eighteen) and anal spines numerous (eleven to thirteen). Three species. Genus \ III. Heliases, Cuv. Resembling Glyphisodon in the oval compressed body. Small mouth. Entire or smooth-edged pre¬ operculum. Large scales and short lateral line, and in the number of spines in the dorsal and anal, but having the teeth of Das¬ cyllus. Branchiostegals five, rarely six. CTENO-LABRHLE. A small but very natural family separated from the ScicenidcB by their united pharyngeals, and the want of muciferous cellular structure of the bones of the skull. They are denominated in the Histoire des Poissons “ Sciaenoides a moins de sept rayons branchiaux et a ligne laterale interrompue; and are there said to be beyond the bounds of the Linnaean genus Sacena, and to have analogies with the Labroids. They are small fishes, of a peculiar rounded oval form, and clothed with large scales, a well- marked family likeness pervading the several genera. Their strongly ciliated scales separate them from the true La¬ broids, whose scales are cycloid. They are edible, but they do not form the objects of special fisheries, not only from their want of size, but because they do not assemble toge¬ ther in numbers. The Glyphisodons and others of die family are prettily banded, and show a pleasing combination and variety of colours. Family II.—CTENO-LABRIDGE, Mull. Compressed oval or oblong fishes, with the head forming part of the general elliptic profile. One dorsal spinous in front; anal also spinous in front, placed with the dorsal on the posterior curve of the oval. Tail between the vertical fins short, moderately high. Scales ctenoid. Air-bladder closed, without appendages. Ovarium closed, with an excretory duct behind the anus. Cranium not cavernous in its outer walls. A single nostril to each pituitary Genus I. Caprodon, Schleg. Teeth card-like on both jaws, before which a row of bigger ones; the three fore teeth of the pre¬ maxillary on each side being large cutting teeth ; front mandibular tooth very large, and pointing backwards ; behind it one somewhat smaller; in the middle of the limb of the mandible there stands a VOL. XII. CYCLO-LABROIDS. The name Labrus applied to a fish is cited by Pliny as occurring in a passage of Ovid which has not been pre- / Fig. 86. Odax Uneatus. served, and the kind of fish it was used to designate cannot now be ascertained. The name was widely and vaguely applied by modern ichthyologists until Cuvier gave the piecise characters of the genus which it now distinguishes. Several species occur in the British seas; none of them prized as an article of diet. The Tautog {Tautoga nigra) of New York, however, is a fish in great request for the table, and sells at the rate of 8 lb. for a dollar. It is tena¬ cious of life, and is kept in stews to fatten. In great colds it becomes torpid, and will not eat. When the^dog- wood {Cornusflorida) comes into flower the Black Tautog is in season. The Lpibulus seizes insects by suddenly thrusting out its mouth, and engulphing those that come within the scope of the elongated tube; at least so says Renard; and the 2 L 266 I C H T H Y Classifica- accounts of this fish shooting drops of water at its insect tion—Pha- preyj like the Chelmons, does not appear to be based on cor- ryng°- rect observation. Scarus was the name given by Forskal gnaths. t0 a gr0Up Gf fiskeg resembling the Labri in all their cha- racters except in dentition, their teeth being incorporated with the substance of their jaws to form convex bones like those of the Tetraodons. The researches of Cuvier prove fully that the fish so named by the ancients was truly of this genus. It was held in high repute either for the ad¬ dress attributed to it of skilfully withdrawing other fishes from the nets in which they were inclosed, or because the epicures greatly esteemed its intestines, or on account of the vast expense incurred in endeavouring to multiply it on the Italian coasts, that it might administer to the extravagant luxury of the world’s capital. Aristotle has several passages respecting its rumination. His assertions have been repeated by Pliny, yElian, and others, without examination; and Ovid and Oppian have spoken of it as a matter beyond doubt, yet no one has verified the obser¬ vation of Aristotle. It passed also among the ancients as a fish that had a voice; and Saidas says that it produced sounds by ejecting water in blowing, and that it could not make itself heard when it was deep in the water. Athe- naeus, quoting Seleucus as his authority, states that the Scarus is the only fish that sleeps and is never taken in the night. .ZElian says that it is the most ardent in love of all fishes, and that many males may be enticed into the nets by the pursuit of a female attached to a line. But still it was the most prudent of fishes, and the most active in showing friendship for its companions. If one was caught by a hook, the others endeavoured to cut the line ; or if en¬ trapped in the meshes of a net, they tried to drag it out by the tail! “ Sic et Scarus arte sub undis, Contextam si forte levi de vimine nassam, Incidit, assumlamque dolo tandem pavet escam. Non audet radiis obnixa occurere fronte, Aversus crebro veniens sed verbere caudse, Laxans subsequetur, tutumque evadit in aequor.” Ovid. It was most plentiful and of the best quality in the Car¬ pathian Sea, between Crete and Asia Minor, but was not unknown even in early times on the Italian coast, though Columella says that it seldom passed beyond Sicily in his day. But in the reign of Claudius, according to Pliny, Optatus Elipertius brought it from the Troad, and intro¬ duced it into the sea between Ostium and Campagna. For five years all that were caught in the nets were thrown into the sea again, and from that time it was an abundant fish in that locality. In the time of Pliny it was considered to be the first of fishes {Nunc Scaro datur principatus); and the expense incurred by Elipertius was justified, in the opinion of the Roman gourmands, by the extreme delicacy of the fish. It was a fish, said the poets, whose very excrements the gods themselves were unwilling to reject. Its flesh was tender, agreeable, sweet, easy of digestion, and quickly as¬ similated ; yet, if it happened to have eaten an Aplysia, it produced cholera morbus. In short, there is no fish of which so much has been said by ancient writers. In the present day the Scarus of the Archipelago is considered to be a fish of exquisite flavour; and the Greeks still name it Scaro, and eat it with a sauce made of its liver and intes¬ tines. It feeds on fucus; and M. Valenciennes thinks that the necessity for masticating its vegetable diet thoroughly, and the working of it with that intent backwards and for¬ wards in the mouth, may have given rise to the notion of its being a ruminant; and it is certain that its aliment is very finely divided when it reaches the stomach. The adjoining woodcut represents Callyodon chlorolepis, a fish of the Australian seas, and number 56, gives views of the teeth of the same species. Woodcut 86 is a representation o L o G Y. of Odax lineatus \ and figures 25, 38, and 39, are views of Classifica- Tig. 87. Callyodon chlorolepis. Labroid scales. The family of Ambiotocidce was constituted by Agassiz for the reception of a single genus of fishes that frequent the western coasts of North America. Family III.—CYCLO-LABRID^, Mull. Oval, elliptical, or oblong scaly fishes, more or less compressed, generally with a proportionally high parallel-sided tail between the vertical fins. Scales cycloid. A single dorsal supported in front by spinous rays, which have frequently membranous processes behind their points. Jaws covered by fleshy lips ; palate smooth, toothless. Three pharyngeal bones, viz., two above and one below, armed with teeth, which are in some species pavement-like, in others lamellated, and in others pointed. No pancreatic caeca; a closed, simple air-bladder; shut ovisacs, with an efferent tube behind the anus. ANALYTICAL TABLE OF THE CYCLO-LABRIDJE (Dum.) Cheeks scaly ; preoperculum crenulated. Dorsal scaly at the base. Mouth protactile; teeth even Clepticus 7. Mouth not protractile; teeth unequal ....Cossyphus 2. Dorsal not scaly. Mouth protractile. Dorsal with short soft rays. Scales very large Epibulus 21. Scales of ordinary size Coricus 6. Dorsal with long filaments Lachnolaimus 8. Mouth not protractile. Teeth equal to one another ......CRENILABRUS 3. Teeth unequal. Dorsal scaly Acantholabrus 5. Dorsal not scaly Ctenolabrus 4. Cheeks scaly; preoperculum not crenulated. Dorsal very long. Scales very large; teeth uniserial Cheilinus 18. Scales of ordinary size. Suboperculum denticulated Malapterus 12. Suboperculum very entire Malacanthijs 10. Dorsal of ordinary length ; rays tasselled Labrus 1. Cheeks scaleless. Snout abnormal, like a beak Gomphosus 15. Teeth unequal, reclining, diverging Anampses 14. Teeth equally curved Cheilio 11. Snout ordinary, pointed. Preorbitar denticulated Tautoga 9. Preorbitar smooth-edged Julis 13. Snout ordinary, smooth and blunt. Profile curved, convex Xyrichthys 16. Profile descending, trenchant Novacula 17. Genus I. Labrus, Linn., Artedi. Lips large, thick, and as if double. Six branchiostegals. Upper jaw generally considerably protractile; teeth on the jaws simple, conical in one or more rows. Pharyngeals cylindrical, smooth, and rounded on the crowns. No spines on the opercular bones. Lateral line almost straight, con¬ tinuous. Cheek and operculum scaly. Thirty species. Genus II. Cossyphus, Cuv. and Yalenc. Maxillaries wide and thick. Behind the exterior row of pointed teeth, small, round, granular teeth crowded together. Opercular pieces scaly. Vertical fins sheathed in scales which rise and fall with the rays, but do not form so deep a sheath as those of the Percoids or Sparoids. Almost all have dis¬ tinct crenatures on the ascending border of the preoperculum, but in some these appear at the angle of the bone only, and are very feeble. Fifteen species. I ICHTHYOLOGY. Classifica- Genus III. Crenilabrus, Cuv. Upper jaw not protractile; ^ra¬ tion—Pha- operculum deeply toothed; lips thickly fleshy ; teeth conical, uni- ryngo- serial, without the granular band of Cossyphus, and also without the gnaths. scaly sheathing of the fins. The continuous lateral line and cycloid scales distinguish them from Chromis and Cichla. Thirty-six species Genus IV. Ctenolabrus, Cuv. and Valenc. A band of villi- form teeth behind the outer row of conical teeth on the jaws. Other characters those of Crenilabrus, such as the finely denticu¬ lated preoperculum, three anal spines, &c. Ten species. Genus V. Acantholabrus, Cuv. and Valenc. Dentition of Ctenolabrus, but with numerous anal spines, representing the Per- coid Centrarchus. Six species. Genus VI. Coricus, Cuv. Conical jaw teeth in one row as in Crenilabrus; jaws greatly protractile, like those of the Menidoe Premaxillaries with long pedicels, and limbs which are thrust out when the mandible is depressed. Preoperculum rounded at the corner, denticulated on the ascending border, but having a smooth lower one. Pharyngeal teeth small, round grains crowded to¬ gether. Short intestine; stomach siphonal, without dilatation • no pancreatic caeca. Distinguished from Epibulus by its continuous lateral line; representing the Menoid Smaris and Gerres. Four species. Genus VII. Clepticus, Cuv. Protractile month, withdrawing beneath the vault of the preorbitars ; denticulated preoperculum • continuous lateral line. Teeth in one row, few, and very small • pharyngeal teeth lamellated, the plates serrated. Vertical fins covered in great part by scales like those of the body. One species. Genus VIII. Lachnolaimus, Cuv. Resembles Labrus in the lips; in general form; in the membrane which descends from the preorbitars ; in the scaly cheeks, and in the filamentous tips of the dorsal spines; but the tips of the anterior dorsal spines are flexible. Lateral line continuous. Anterior teeth strong, curved, and standing forwards, followed by a series of small teeth of even height. The pharyngeals, instead of being wholly covered with pavement-like teeth, as in Labrus, are only partially so, the rest of the bone being clothed with velvety membrane. No pancreatic caeca. Six species. Genus IX. Tautoga, Mit. Labroids distinguished by a double row of strong conical teeth on both jaws, and the extent of thick scaleless integument on the face, which reaches to the operculum] suboperculum, and interoperculum, and even on the preoperculum the scales are few. Branchiostegals five. Lateral line continuous Xine species. Genus X. MalaCanthus, Cuv. Resembling Coryphcena in the length of the dorsal and anal, and in the rays of these fins being nearly as flexible, but allied to Lachnolaimus by scaly cheeks, and a continued lateral line. The proper generic character is the’long dorsal, with only three or four simple rays in front, the others being branched. Body slightly compressed, long. Scales small. Anal nearly as long as the dorsal. Mouth tolerably large; lips fleshy; a row of teeth on the jaws ; large, and curved in front, much smaller towards the angles of the mouth. Palate and tongue smooth- upper pharyngeal teeth card-like; under pharyngeal teeth in some species wholly card-like, in others partly so, partly pavement-like. A pretty strong spine at the angle of the operculum. Stomach siph¬ onal ; no pancreatic caeca. Two species. t Genus XI. Cheilzo, Comm. Premaxillaries widening inte¬ riorly into a granular osseous plate peculiar to this genus among the Labroids. Exterior row of teeth triangular, compressed, and trenchant, like those of some Sphyrcence or Cybiums; the symphysial pair hooked, and longer than the others, which are of equal height among themselves, and in the interspaces between all these teeth there are small conical ones. The lateral line is continuous; and there are a few scattered scales on the cheeks. Fin rays flexible. Eight species. Genus XII. Malapterus, Valenc. Combines many of the characters of Malacanthus and Cheilio, having the flexible rays of Cheilio, teeth of Labrus, scaly operculum of Malacanthus, but not the opercular spine. One species. Genus XIII. Julis, Cuv. Lateral line continuous; stiff and pointed spines in the dorsal. Head entirely naked, that is to say the suborbitar chain, preoperculum, and other bones of the gill- cover, the under surface of the head, and the jaws, are destitute of scales. Teeth conical in the outer row, longer and stronger the nearer the symphyses; within there are some granular teeth, largest in the old fish, being indications of teeth incorporated with the bone, as in Cheilio, and more fully shown in Scarus. Some species have a canine at the corner of the mouth pointing forwards, form¬ ing the genus Halichorus of Riippell. Pharyngeal teeth as in Labrus. One hundred species. Genus XIV. Anampses, Cuv. Two teeth on the upper jaw one on each side of the symphysis, turning from each other, flattened longitudinally; chisel-shaped at the crown and trenchant; the mandibular pair more conical, yet a little flattened at the point ; pharyngeals of Labrus for bruising. Branchiostegals six. General’ 267 form that of one of the higher bodied Jules. Head naked. Lateral Classifica- line continuous. Six species. ^urn Pha- Genus XV. GoMPHOsus,Lacep. (#<%>«, Comm.) Body oblong, ryngo- compressed. Scales large. Head quite naked; eye small; nostrils gnaths. near the orbit; muzzle slender, elongated, cylindrical; orifice of v. / the mouth formed by the premaxillaries and mandible. Unise- v rial teeth on the jaws, the anterior ones longer ; pharyngeal teeth pavement-like, as in Labrus. Gill-covers approaching one another under the throat; gill-openings narrow. Branchiostegal membrane adherent to the isthmus ; branchiostegals six. Dorsal and anal but shghtly elevated, and of uniform height. Lateral line branching and deflexed near the caudal. Stomach and oesophagus straight; no pancreatic caeca ; a long, narrow air-bladder. Three species. Genus XVI. Xyrichthys, Valenc. Form that of a Labrus, except that the profile of the face is almost vertical, with the eye high up; this is owing to the growth of the snout directly down¬ wards, while the mandible of ordinary length is horizontal. The resulting aspect is peculiar. Many characters common to it and Labrus or Julis. Head naked, and, from compression, trenchant in the face, which is sustained by the nasal bone. Dorsal long and of uniform height. Teeth in one row, longest near the symphysis; Pharyngeal teeth small, pavement-like ; palate and tongue smooth. Lateral line interrupted generally as in Scarus, but the tubes on each scale simple. A species of double lip is formed by the edge of the preorbitar, which descends to the corner of the mouth. Intestinal tube simple, without any stomachal dilatation, and with¬ out pancreatic caeca; air-bladder large, pointed anteriorly, rounded behind. Fourteen species. Two species have the three front rays detached as a separate fin, and form the only instance, except Novacula, of a Labroid with two dorsals. Genus XVII. Novacula, Valenc. Preoperculum scaly under the eye, with the mandible more ascending in other respects, like Xyrichthys. Generally the first two dorsal rays are somewhat de¬ tached from the others, and connected to them by basal membrane only. Six species. Genus XVIII. Cheilinus, Cuv. Lateral line interrupted under the end of the dorsal. Lips thick; large, uniserial, conical teeth on the jaws. Large scales on the cheek; scales of the body broad and thin, advancing on the base of the caudal, but leaving the dorsal and anal naked as in Labrus. Splanchnology also as in that genus, but the bones are green in some, if not in all the species, like those of Belone. Twenty-four species. Genus XIX. Charges, Rupp. Both jaws armed with similar tapering stripes of teeth, succeeded posteriorly by small tufts of teeth ; four stout conical canines in front of each jaw. Thick lips. Scales of the operculum and preoperculum of moderate size; on the body the scales are larger. Lateral line interrupted. Spines of the dorsal and anal strong and pointed. Java. Genus XX. Cirrhilabrus, Schleg. A toothed preoperculum ; an interrupted lateral line. Scaly gill-cover. Ventrals prolonged into filaments. Branchiostegals five. Genus XXL Epibulus, Cuv. Protractile mouth, the mechanism of which differs from that of Coricus. The nasal pedicels of the premaxillaries play in grooves of the skull, and reach back to the occiput, while the descending branch is attached by a long ligament to the lower end of the maxillary bone, and, consequently, when the mouth opens, draws forward that end of the maxillary together with mandible, which is also connected to the same end of the maxillary. The hypotympanic and mesotympanic unite to form a lever, and assist in this movement. The scales are very large, and cover the cheeks, but are there embedded in the skin, and the face is naked. The large jaws, with the projection of the hypotympanic and angular portion of the mandible, give a peculiar aspect to the fish which otherwise resembles a Glyphisodon. Branchiostegals five. Lateral line interrupted. One species. Genus XXII. Scarus, Forsk. Labroids of oblong and rather massive forms, lateral line interrupted under the end of the dorsal, and recommencing lower down. Large scales extending to the gill- covers and cheeks. Jaws resembling those of Tetraodon, each divided into halves by a median suture. The teeth are incorporated with the bone, and shine through the glazed surface in crowded quin- cuncial order ; the oldest form the trenchant border of the jaw, and as they are worn away they are succeeded by the lower ranks,’new pulps developing at the base of the jaw to keep up the succession. In some species the quincuncial surface is even and polished, in others it is granular from the prominence of the crowns of the teeth, and in some a few pointed canines protrude from the angle of the upper jaw, or from other parts of it. Pharyngeal teeth trenchant and standing up like verticle tiles, producing in the using, narrow, projecting ellipses of dentine surrounded by enamel; the base of each tooth is osteodentine, and it is bound to the others by cement. Each of the superior pharyngeals carries two or three longitudinal ranges, the number varying with the species; the single under pharyngeal is fixed by a thin vertical plate in the angle formed by f 268 I C H T H Y Classifica- the last pair of branchial arches, and rests upon the lateral processes tion—Ana- of the coracoid. Its concave surface, studded with compressed teeth canths. in quincunces, receives and acts against the upper pharyngeal denta v ^ ! plates ; the length of these plates increases with age. On each side of the inferior pharyngeal there are two mucous sacs, papillose within. Stomach without a caecum, and no pancreatic caeca. Gene¬ ral aspect, except in respect of the teeth, that of Cheilinus, generally with a higher body than Labrus or Julis. Ninety species.. Genus XXIII. Callyodon, Gronov. Scari, whose anterior teeth are tiled in many rows, the lateral ones of the upper jaw being pointed and scattered, while within the jaw there is a row of much smaller ones. Figure 56 represents the teeth of Callyodon chloro- lepis. Twelve species. Genus XXIV. Odax, Comm. Head and body elongated; snout pointed ; lips swollen, and a fold from the cheek and preoperculum makes a posterior lip as in Labrus. Lateral line continuous, and composed of simple not branching tubes, as in Labrus. Teeth in¬ corporated with the jaw, but the compound dental pieces thus formed are thinner than in Scams, the jaws bulging less; pharyn- geals as in Labrus, with which they have more affinity than with Scarus. Eight species. Family IV.—AMBIOTOCID^E, Agass. The general aspect of the fishes on which this family is founded is that of Pomotis, or of the higher bodied Sparidce ; they are com¬ pressed and oval, with middle-sized cycloid scales ; opercular pieces without spines or serratures. Branchiostegals six. Lips moderately thick ; orifice of the mouth formed above by the premaxillaries, to the exclusion of the maxillaries; both these bones somewhat protractile; teeth on the premaxillaries, mandible, and pharyngeals only, none on the vomer or palatines. By their entire gill-covers, they are farther removed from the Perch family than from the Sparoids, but the cycloid scales separate them from the latter, which have all ctenoid scales. By their thick lips they approach the Labroids, but differ in the construction of the mouth. M. Agassiz gives an interesting paper on this family in Troschel’s Arch, fur Naturg., 1854. The name of Ambiotoca is deduced from the mode in which the young are produced, analogous to that of the Kan¬ garoos. The designation of Holconoti has also been proposed on ac¬ count of a naked stripe parallel to the hinder basis of the dorsal fin. Troschel remarks that this family is a peculiar one, nearly allied to the Labridce cycloidei, but that it cannot enter that group on account of the unusual structure of the gills. Genus I. Ambiotoca. Order IV.—ANACANTHS. This order was indicated by Muller, and according to the characters which he assigns to it, as given in the table, the only difference that exists between it and the Acanthopteri is the absence of spinous or pungent rays in the fins; but many of the Gobiidce have also rays wholly flexible, and that family may be considered as furnishing links between the orders. Indeed, there are some forms which may, with almost equal propriety, be placed in either. The ventral fins, when present, are attached to the thorax or throat. Fig. 88. Machcerium subducens. On the Ophididce we need not dwell, the members of that family being fishes of small size of little utility to man. The groups composing it have been investigated by Dr Kaup of Darmstadt, and our table gives the results of his la¬ bours. Fig. 88 represents the Machcerium subducens, an Fig. 89. Gymnelis viridis\ Australian species, and fig. 89 Gymnelis viridis, an inhabi¬ tant of the Arctic seas. 0 L 0 G Y. Order IV.'—ANACANTHINI, Mull. Classifica- Endo-skeleton ossified ; exo-skeleton in some as cycloid, in others aS ctenoid scales. Fins supported by flexible or jointed rays ;ventrals beneath the pectorals, or none. Swim-bladder without air-duct in the Gadidce, absent in Ophididce, Echeneidce, Macrouridce, and Pleuronectidce. Sub-Order I.—APODES. Family I.—OPHIDIDiE. Gadus-\Wz fish without ventrals. Body elongated, more or less dagger-like posteriorly; the tail surrounded without a break by the vertical fins. Genus I. Mach^rium, Rich. Anus at the termination of the first third part of the length of the fish. Body scaly. Mandible destitute of a barbel; uniserial, incisorial teeth on the jaws. Dorsal beginning somewhat behind the pectoral; anal occupying two- thirds of the length of the body. Six branchiostegals. Lateral line ceasing under the tenth ray of the dorsal. No swim-bladder. Two species. Genus II. Ophidium, Lin. Anns at the termination of the first third part, or of the half of the length of the fish. Body scaly. Two pair of barbels attached beneath the point of the glosso-hyal (or lingual) bone. A swim-bladder. Small sword-shaped fish, with lowly developed dorsal and anal fins, supported by simple rays only. Air-bladder large and oviform, with three proper ossicles, the middle one of which is moved by a peculiar muscle. Six species. Genus III. Gymnelis, Reinh. (Cepolophis, Kaup.) Ophidia without barbels, and destitute of scales; resembling the proper Ophi¬ dia in the blunt head. The vomerine teeth do not project forwards, but lie deep in the palate. Anus situated in the fore part of the fish. Pectorals and vertical fins moderately developed. They are distinguished from Fierasfer in that the anus is not in the pectoral region, but farther back. The body also is less slim, and the tail not so much dagger-like. Two species. Genus IV. Fierasfer, Cuv. (Echiodon, Thomp.; O.vybeles, Rich., Bleek.) Anus in the pectoral region. Vomer projecting forwards, with blunt or laterally compressed teeth. Seven branchi¬ ostegals. No scales. Three species. Genus V. Encheliophis, Miill. Abrachial as well as apodal; anus behind the gills. Six branchiostegals. GADOIDS. This is a most important family, and the fisheries estab¬ lished for the capture of its various members have, more than any other tribe of fishes, been the means of forming great numbers of hardy and able seamen. Its members live in cold or temperate climates, and constitute a very im¬ portant article of fishery. The greater number are consi¬ dered wholesome, and form a light and agreeable food,— the flesh separating easily by boiling into white flaky layers. The great sand-bank of Newfoundland is the most famous station of the Cod fisheries, and is resorted to by English fishermen, who chiefly use the hook and line. The fish abound in this place probably on account of the great quan¬ tity of the smaller animals which serve as food, viz., mussels, clams, &c. Morrhua vulgaris, the common Cod {la Morue, Fr.; Kabliau, Germ.), measures from two to three feet in length. The back is spotted with yellowish brown. It inhabits the whole Northern Ocean, and occurs in vast profusion. This fish dwells in salt water only. It is not found nearer the equator than the 40th degree of latitude. The weight of the common Cod varies from 12 to 80 or even 100 pounds. It is extremely voracious, and its digestive powers are seem¬ ingly very great. It feeds upon smaller fishes, such as Herrings, on Mollusca, Worms, and Crustacea, and even on the young of its own species. It has a strong, muscular stomach, and is said to possess the power of rejecting by the mouth substances, such as wood, &c., which it finds in¬ digestible. In spring it comes nearer the shore in order to deposit its spawn. This happens in January in England, in February in Norway, Denmark, and Scotland, and in March in Newfoundland. One female is said to contain from four to nine millions of eggs! The most extensive Cod fisheries ICHTHYOLOGY. 269 Classifica- on our coasts are off the Western and Shetland Isles, but tion—Ana-they are still greater in more northern countries. The Cod canths. j^g {jeen fished on the coast of Sweden since the year 1368 by the inhabitants of Amsterdam. The English resorted to the fisheries of Iceland before the year 1415; and it is stated that in the year 1792, 200 French vessels, of a bur¬ den of 191,153 tons, were employed in the Cod fishery. Every year more than 6000 European vessels are engaged in this fishery. The flesh of the Cod has a good flavour, and may be easily preserved. The tongue, salted and dried, has been considered a great delicacy. The gills are preserved and used as bait. The liver is eaten, and of late years the oil it yields has brought a high price owing to its importance as a medicine. The swimming-bladder affords a very good isinglass. This important species constitutes a principal article of food to the inhabitants in some parts of Iceland, Norway, and other northern countries. In a dried state it is also much used in some papal kingdoms of the south. In the neighbourhood of the Isle of Man, and elsewhere, there is a variety of the Cod named the Red or Rock Cod, the skin of which is of a brightish vermilion colour. Its flesh is much esteemed. Morrhua ceglejinus, the Haddock (FEgreJin, Fr.; Scholl- Jisch, Germ.), is as well known, and almost as important, as the Cod in this country ; it is of a smaller size, usually eighteen inches long. The back is brown, the belly silvery, and the lateral line black. There is a blackish spot behind the pectoral fin, which tradition assigns to the impression of St Peter’s finger and thumb, when he took the tribute money out of the mouth of a fish, the inventors of the legend never adverting to the improbability of a marine fish living in the fresh-water lake of Gennesaret. The Haddock is found, like the Cod, in the Northern Ocean, but does not enter the Baltic. It annually approaches the British shores in February and March, in order to deposit its spawn. The regularity with which it reappears in some districts, on a stated day, is quite remarkable. On the coast of York¬ shire, since the year 1766, it has made its annual appear¬ ance on the 10th of December. To this place it comes in such numbers as to form an immense shoal 3 miles broad, and extending 80 miles in length—from Flamborough Head to the mouth of the Tyne. It is in autumn that they visit the shores of Holland and East Friesland, and the neigh¬ bourhood of Heligoland. The Haddock frequents our coasts during the greater part of the year, although the largest are taken in the winter. Its flea, is generally best in the months of May and June, and is greatly superior on the east coast of Scotland than when taken in the southern parts of the English Channel. On the coast of Hampshire it is a very inferior fish. Morrhua callarias, the Dorse, is smaller than the Had¬ dock, resembles the Whiting in taste, and is by many con¬ sidered to be the best fish for the table of all this family. It is in great request on the coasts of the Baltic. It fre¬ quents the mouths of large rivers, and ascends them with the salt tide in June. The Morrhua lusca and harhata, Bib and Whiting Pout, are considered by one so well ac¬ quainted with the British fishes as Mr Yarrell, to be but one species, and are well known on the English coast, being brought in considerable quantities to the market. They are in best condition for the table in November and December. Merlangus vulgaris, Whiting (Merlan, Fr.), is valued on account of its abundance, and the wholesomeness and fine flavour of its flesh. Its fishery lasts the whole year, but is most plentiful in January and February, and is generally carried on within a mile or two of the shore. Merlangus carbonarius, Cole-fish {Kohlfisch, Germ.) The flesh of the young is rather delicate; that of the adult is somewhat leathery, but it is used when salted and dried, like the Cod. I his is the Podleg, Silloch, Cuddy, &c., of our coasts. The young swarm along the British shores, and form a frequent Classifica- sustenance of the lower orders of the Western Highlands tlon—^na' On one occasion we killed 33 dozen with the rod in a few canths> hours, using a line with 6 small flies. By giving the line one or two additional turns through the water, we frequently pulled 6 ashore at once. It even constitutes an important article of exportation from our northern coasts. In Norway the poor feed upon it; and oil is made from its liver. The adult fish is taken principally in summer; it deposits its spawn in this country in February and March. The Coal- fish is found in the North Atlantic and Pacific Oceans ; and sometimes, though very rarely, in the Mediterranean Sea,—for example, near Nice. Merlangus pollachius, the Pollock or Pollack, about 18 inches long; resembles M. carbonanus in its general form. Its flesh is considered better than that of the Coal-fish, and inferior only to that of the Dorse and Whiting; it inhabits the Atlantic, and is gregarious. It is commonest on the coasts of Norway and the north of England, and sometimes occurs in the Mediterranean in winter. It is easily caught with a white fly. Of the Merluccius vulgaris, or Common Hake, great numbers are taken in the ocean, and in the Mediterranean. On the coasts of the Mediterranean it is called Merlan or Whiting; and, when dried, it receives in the north the name of Stock-fish, in the same way as the Cod. It is said to be very abundant in the Bay of Galway, on the west of Ireland, and at Penzance in Cornwall. The flesh is white and flaky, and its liver is considered a delicacy. The Brosmius vulgaris, Tusk, or Torsk, is common in the Shetland seas, but seldom comes so far south as the Firth of Forth. It is a most excellent fish for the table when newly caught, being far superior to the Cod, but rarely appears in the southern markets. It cures well. Molva, or Lota molua, is the only fresh-water fish of this family which exists in England, and is very local, being confined to a few rivers mostly of the midland counties. It is named the Burbot and Coney-fish, and its flesh is said to be good. One, or perhaps two species frequent the northern waters of the American continent, but their flesh, though wholesome, is lightly esteemed in a country which abounds in Coregoni and Trout of the richest flavour. The roe, which is remarkable for the smallness of its eggs, makes a substantial bread when pounded and mixed with a proportion of flour. The Ame¬ rican fish is named Methy, and furnishes names for many rivers and lakes of that country. It is voracious, and feeds much on fresh-water Cray-fish. The Gadoid family is scarcely known near the equator, but reappears again in the higher southern latitudes in the same generic forms though differing in species, and doubt¬ less fisheries of these useful fishes will hereafter be esta¬ blished on the Australian coasts, when the submarine sand¬ banks come to be known, and the increase of population raises a greater demand for fish. The subjoined woodcut represents the Lota breviuscula from the Bay of Islands, New Zealand. Fig. 90. Lota breviuscula. Sub-Order II.—THORACICI. Family I.—GADIDA5. Body moderately elongated. Scales small, soft. Head naked. ICHTHYOLOGY. 270 Classifica- No spines in the fins. Jaws and front of the vomer with pointed tion—Ana- teeth, of unequal height, producing card-like or raduliform patches. canths. Branchiostegals seven. One or more dorsal fins. Stomach capa- v. ■> cious, caecal; pancreatic caeca numerous. A large air-bladder with strong walls, often denticulated at the sides; a large branch of the caeliac artery perforates the fibrous coat of the air-bladder, and divides into a dense network inclosing long corpuscles with fine villiform processes, producing together one of the organs named vaso-ganglion, which exists in the air-bladders of many other fishes. ANALYTICAL TABLE OF THE GADIDJE (Dum.) Dorsal single. Vertical fins separate Brosmius 7. Vertical fins united Brotula. 8. Dorsals several. Dorsals two. Barbels three; one rostral Motella 6. Barbels one. Jugulars of many rays Lota 5. Jugulars of one forked ray Phycis 10. Barbels none; one anal Merluccius 4. Dorsals three. Anals two. Barbels conspicuous { c> } 1. Barbels none Merlangus 3. Genus I. Gadus, lAnn.partim. (Morrhua,Qxi\.') Three dorsal fins; two anals ; a symphysial mandibular barbel. Genus II. Gadiculus, Guich. Resembles Morrhua in the fins, but the barbels are wanting, as in Merlangus. Body elongated, compressed. Head small, scaleless; jaw teeth pointed, ranged in many rows. Chiefly distinguished by the bigness of the eyes, and the want of vomerine teeth: the mandible projects a little. Al¬ giers. Genus III. Merlangus, Cuv. Gadi, without barbels. Genus IV. Merluccius, Cuv. Two dorsal fins; one anal fin. No barbels. Genus V. Lota, Cuv. Two dorsal fins; one anal fin. Barbels. Genus VI. Motella, Cuv. Number of fins as in Lota, but the first dorsal scarcely perceptible. Genus VII. Brosmius, Cuv. A single long dorsal reaching very near to the caudal. Genus VIII. Brotula, Cuv. Vertical fins uniting at the end of the tail to form one pointed fin. Genus IX. Ateleopus, Schleg. Snout very thick over the mouth, which is protrusive beneath. A band of card-like teeth above and below; vomer and palatines toothless. Ventrals on the throat one-rayed; a small dorsal over the pectorals; anal very long; caudal small. Japan. Genus X. Phycis, Artedi, Schneid. Ventrals of a single ray, which is often forked. Head large. A symphysial mandibular barbel. Two dorsals, the second one long. Genus XI. Raniceps, Cuv. Head more depressed than in other genera of this family. Anterior dorsal almost concealed in the thickness of the skin. Genus XII. Bythites, Rein. Body compressed, thicker an¬ teriorly. Profile of head bluntly rounded. Tail ensiform, tapering to a point. Scales minute, round, imbricated. Lateral line inter¬ rupted over the anus. Teeth acute on the premaxillaries, mandible, vomer, and palatines. Branchiostegals eight, the membranes uniting under the isthmus with a free edge; gill-openings very large. Arentrals jugular, of one filiform ray, each very long; vertical fins united, without any distinction of the caudal; rays jointed, divided. A very thick, conical, three-pointed papilla projected backwards behind the anus. No pneumatic tube to the air-bladder. One species. MACROURIDS. This family consists of a single genus, which stands next to the Gadoids in the Regne Animal, and certainly has many portions of structure of a similar character, particularly the turning down of the edge of the suborbitars, but these bones are much more developed than in Gadus, and their reverted plates appear on the surface of the cheek covered with rough scales. I he Macrourids are inhabitants of deep water like most of the Gadoids, and have not been disco¬ vered near the equator, though they exist in both the north¬ ern and southern hemispheres, and in the Pacific as well as Atlantic divisions of the ocean. Figures 30, 32, 33, and Classifica- 34 represent the scales of several Macrouri, remarkable fortion—Ana- their discal spines, but differing from the ciliated scales canths- named Ctenoid. The subjoined woodcut represents Ma- crourus australis. Fig. 91. Macrourus australis. Family II.—MACROURID^E. Turbinals largely developed, forming, by apposition of their plates, a thin, high, mesial crest, and a lateral wing-like process on each side; these, in conjunction with the reverted plate of the pre- orbitar, support a more or less elongated snout, which is generally, perhaps always, acute. Body highest and fullest at the pectoral region, compressed and dagger-shaped posteriorly, or tapering to an acute point. Ventrals, pectorals, and first dorsal, in a vertical line; first dorsal short and high; anal and second dorsal long and even, uniting at the point of the tail without any distinction of caudal. Anus^in the anterior quarter of the fish. Teeth fine, villi¬ form on the jaws; palatines, vomer, and tongue edentate; mouth horizontal, inferior behind the projecting snout; premaxillaries forming the border of the upper jaw, and protractile directly down¬ wards, their long pedicels moving under a vault formed by the turbinals ; maxillaries behind the premaxillaries, gliding partially under the reverted edge of the preorbitar. Scales studded with acute spines, varying in form and number with the species. Eye large ; head encased by the scaly surfaces of muciferous bones. Branchiostegals six. Stomach globular; numerous pancreatic casca. Genus I. Macrourus, Bloch. (Lepidoleprus, Risso.) Nine or ten species in the temperate and colder seas of the northern and southern hemispheres. REMORA FAMILY. The Echeneididce stand in Cuvier’s Regne Animal next to the Discoboles, but Muller has transferred the latter to Gobiidce, making them a subordinate tribe under the appel¬ lation of Cyclopodi, and associating with them generally the fishes that have disks which can be used as suckers. Bo¬ naparte places the Echeneides as a group subordinate to his Gadi. The absence of spinous rays seems to point out the Anacanthini as their most appropriate order, but the same reason might bring several Gobioid genera with them. One species, however, of Echeneis has bony compressed rays in the pectoral, terminated by a little crenulated disk, and some have considered the disk on the head in this genus to be a modified first dorsal fin. The extraordinary power possessed by this fish {Echeneis remora), of adhering tenaciously to any flattish surface, was known to ancient writers, as well as to the curious inquirers of modern times. Pliny luxuriates upon it with his usual discursive verbosity, and the reader may possibly be amused by Philemon Holland’s translation of the passages in ques¬ tion :—“ Having so far proceeded in the discourse of na¬ ture’s historic, that I am now arrived at the very height of her forces, and come into a world of examples, I cannot chuse but in the first place consider the power of her ope¬ rations, and the infinitnesse of her secrets, which offer them¬ selves before our eyes in the sea : for in no part else of this ICHTHYOLOGY. Classifica- universal frame is it possible to observe the like majestic ti0I1_tifna" °f nature : insomuch> as need not seeke any farther, nay, cantns. we 0Ugjlt not to more search jnto ]ler divinitie, con- sidering there cannot be found any thing equall or like unto this one element, wherein she hath surmounted and gone beyond her own selfe in a wonderfull number of respects. For, first and foremost, is there any thing more violent than the sea; and namely when it is troubled with blustring winds, whirlepuffs, storms, and tempests; or wherein hath the wit ot man been more employed (seeke out all parts of the known world) than in seconding the waves and billows of the sea, by saile and ore ? Finally, is there ought more admirable than the inerrable force of the reciprocal! tides of the sea, ebbing and flowing as it doth, whereby it keep- eth a current also, as it were the stream of some great river ? b The current of the sea is great, the tide much, the winds vehement and forcible; and more than that, ores and sailes withall to help forward the rest, are mightie and power full: and yet there is one little sillie fish, named Echeneis,. that checketh, scorneth, and arresteth them all. Let the winds blow as much as they will, rage the storms and tempests w'hat they can, yet this little fish commaundeth their furie, restraineth their puissance, and, maugre all their force, as great as it is, compelleth ships to stand still: a thing which no cables, be they never so big and able as they will, can perform. She bridleth the violence and tameth the greatest rage of this universall world, and that without any paine that she putteth herselfe unto, without any holding or putting backe, or any other meanes save only by cleav¬ ing and sticking fast to a vessell: in such a sort as this one small and poore fish is sufficient to resist and withstand so great a power both of sea and navie, yea and to stop the passage of a ship, doe they all what they can possible to the contrarie. What should our fleets and armadoes at sea make such turrets in their decks and forecastles? what should they fortifie their ships in warlike manner, to fight from them upon the sea, as it were from mure and rampier on firme land ? See the vanitie of man ! alas, how foolish are we to make all this adoe ? When one little fish, not above half a foot long is able to arrest and stay per force, yea, and hold as prisoners, our goodly tall and proud ships, so well armed in the beakehead wfith yron pikes and brazen tines; so offensive and dangerous to bouge and pierce any enemie ship which they doe encountre. Certes, reported it is, that in the naval battaile before Actium, wherein An- tonim, and Cleopatra the queene, were defeited by Augus¬ tus, one of these fishes staied the admirall ship wherein JSA. Antonius was, at what time as he made all the hast and meanes he could devise with help of ores to encourage his people from ship to ship, and could not prevaile, untill he was forced to abandon the said admirall, and go into ano¬ ther galley. Meanwhile the armada of Augustus Ccesar, seeing this disorder, charged with greater violence, and soone invested the fleete of Antonie. Of late daies also, and within our remembrance, the like happened to the roiall ship of the Emperor Caius Caligula, at what time as he rowed backe, and made saile from Astura to Antium ; when and where this little fish detained his ship, and (as it fell out afterward) presaged an unfortunate event thereby : for this was the last time that ever this emperour made his returne to Rome : and no sooner was he arrived, but his own soul- diours in a mutinie fell upon him and stabbed him to death. And yet it was not long ere the cause of this wonderfull staie of his ship was knowne : for so soon as ever the vessel (and a galliace it was, furnished with five bankes of ores to a side) was perceived alone in the fleete to stand still, pre- sentlie a number of tall fellows leapt out of their ships into the sea, to search what the reason might be that it stirred not; and found one of these fishes sticking fast to the very helme : which being reported unto Caius Caligula, he fumed and fared as an emperour, taking great indignation that so small a thing as it should hold him back perforce, and check the strength of all his mariners, notwithstanding there were no fewer than foure hundred lustie men in his galley that laboured at the ore all that ever they could to the contrarie. But this prince (as it is for certain knowne) was most astonied at this, namely, that the fish sticking only to the ship, should hold it fast; and the same being brought into the ship and there laid, not worke the like effect. They who at that time and afterward saw the fish, report that it resembled for all the w'orld a snaile of the greatest making: but as touching the form and sundrie kinds thereof, many have written diversly, whose opinions I have set downe in my treatise of living creatures belonging to the waters, and namely in the particular discourse of this fish : neither doe I doubt but all the sorte of fishes are able to doe as much: for this we are to believe, that Pourcellans also be of the same veitue, since it was well knowne by a notorious ex¬ ample, that one of them did the like by a ship sent from Periander to the Cape of Gnidos: in regard whereof, the inhabitants of Gnidos doe honour and consecrat the said Porcellane within their temples of Venus. Some of our Latin writers do call the said fish that thus staieth a ship, by the name of Remora.” Another species, Echeneis naucrates, Linn., commonly called the Indian Remora, has usually twenty-two plates upon the head. In its habits it resembles the preceding; but it seems to be more frequent in the seas of India and America than in those of Europe. The manuscripts of Commerson, as quoted by Count Lacepede, inform us that it is common along the coasts of Mosambique, where it is made use of in a singular way for the purpose of catching turtles. A ring is first fastened round its tail, and then a long cord is attached to the ring. When thus accoutred, the fish, placed in a vessel of sea-water, is carried out in a boat; and as soon as the fishermen perceive a sleeping turtle, they row gently towards it, and throw the Remora into the water, with a sufficient length of cord. It seldom fails speedily to attach itself to the unconscious turtle, which by the tenacity of its adherence is immediately drawn to¬ wards the boat and captured. Family III.—ECHENEIDIDiE, Bonap. Remarkable and peculiar in having a flat head occupied on the dorsal aspect by a laminated disk that forms an adhesive sucker by which the Echeneis can attach itself to ships or other fishes, most commonly to the large Sharks. Body elongated, tapering much towards the tail; scaly. Dorsal single, malacopterous opposite to the anal. Eyes lateral. Mouth small, horizontal; mandible pro¬ jecting; teeth on the premaxillaries and mandible villiform or fine card-like; a row of hair-like teeth on the edge of the max- illaries, which form the sides of the upper jaw ; villiform teeth on the front of the vomer and the surface of that bone, and of the tongue rough. Branchiostegals eight. Stomach caical, large; a wide, short intestine ; no air-bladder. The laminae of the disk are spin¬ ous on the edges, the spines being in most species very short and slender; the number of laminae varies in different species. Genus I. Echeneis, Linn. FLOUNDER FAMILY. Though the Pleuronectidce do not require the same ar¬ maments for deep-sea fishing that the Gadoids do, yet they are of great importance to our maritime population, and give employment to large bodies of fishermen at most parts of the coast. Ihese fish abound in comparatively shallow water, where the bottom is sandy, though some of the largest, as the I urbot and Holibut, are taken further out to sea. As they feed habitually at the bottom, the Flounders are chiefly captured by trawlers. Mr Yarrell states that London alone pays L.15,000 a-year to the Danes for lob¬ sters to make sauce for the Turbots brought to the London 271 Classifica¬ tion—Ana- canths. 272 ICHTHYOLOGY. Classifica- market, which amount, according to the same authority, to tion— 88,000 in a season. Pennant has particularly described the Acanthop- extensive Turbot fishery at Scarborough. There are three Fishe« men in each of the fishing-boats, each man having tlnee v ^ , HneS) and each line 280 hooks. All the nine lines are fas- ^ v tened to<>-ether, and then extended to about three miles in length ; they are laid across the current, and are allowed to remain for six hours before they are hauled in. This fish is called the Water or Sea Pheasant, by the French common people, on account of its fine flavour. Family IV.—PLEURONECTIDA3. Peculiar among fishes in showing a want of symmetry in the head, the eyes being turned to that side, which is uppermost when the animal swims, and is always darker-coloured than the other side. Body extremely compressed, so that the ventral and dorsal aspects are mere edges, the sides forming disks, round, oval, ovate, or elliptical, differently coloured, the paler one simulating the belly, and being beneath in the usual position of the fish. Dorsal extending along the whole back, and in some running forwards to the nostrils ; anal fringing in the sam eway the ventral edge; jaws and ventrals generally unsymmetrical, being smaller on the pale side. Branchiostegals six. The presphenoid is twisted to one side, and the mid-frontal is one of the most distorted bones in the cra¬ nium of these fishes. There is no want of symmetry in the spinal column and its processes posterior to the scapular arch; the inter- neural and interhmmal spines are in pairs, supporting one dermo- neural or dermohaemal spine. No air-bladder. ANALYTICAL TABLE OF THE PLEURONECTIDJ2 (Dum.) Body rhomboidal. Dorsal over the eyes which are dextral. Teeth broad, trenchant Platessa 1. Teeth villiform Hippoglossus 2. Dorsal over the upper lip ; eyes sinistral Rhombus 3. Body oval, or much elongated. Pectorals very distinct, on both sides Solea 4. Pectorals distinct on one side only MONOCHIR 5. Pectorals wanting. Vertical fins separated Achirus 6. Vertical fins united Plagiusa 7. Genus I. Platessa, Cuv. Obtuse, trenchant, uniserial teeth on the jaws; most frequently pavement-like teeth on the pharyngeals. Dorsal not coming further forward than the centre of the upper eye ; caudal separated by intervals from the dorsal and anal. Form rhomboidal. Eyes generally on the right side. Pancreatic cmca three, small. Genus II. Hippoglossus, Cuv. Fins of Platessa, with gene¬ rally a more oblong form. Teeth card-like, often strong and pointed on the jaws and pharyngeals. Genus III. Rhombus, Cuv. Teeth on the jaws and pharyngeals villiform, or card-like, as in Hippoglossus, but the dorsal comes forward to the border of the upper jaw, and extends like the anal to near the caudal. Eyes for the most part on the left side. Gknus IV. Solea, Cuv. Mouth curved and turned almost wholly to the blind side of the head ; teeth situated on that side only, finely villiform ; form oblong ; snout round, and almost always advancing before the mouth. Dorsal commencing at the mouth and extending like the anal to the caudal. Lateral line straight. Blind side of the head often garnished with cutaneous shreds like villi. In¬ testine long, often doubled ; no pancreatic caeca. In some the caudal is not distinct from the other two vertical fins. These form the genus Brachirus of Swainson, or Synaptura of Cantor. Genus V. Monochir, Cuv. iSWes destitute of a pectoral on the blind side, or having merely an almost imperceptible vestige of one, the pectoral on the side of the eyes being very small. Genus VI. Achirus, Lacep. Abrachial Soles, with the vertical fins distinct. Genus VII. Plagusia, Brown. Abrachial Soles, with the ver¬ tical fins united. Order V.—ACANTHOPTEROUS FISHES. perature, depth, altitude above the sea, or other circum- Classifica- stances. There is certainly some connection between the ciliated scales with which the great majority of fishes of this order are clothed, and the spinous terminations or serrated FisheS. edges of many of the bones of the head and shoulder which y appear on the surface, and assume more or less the condi¬ tions and functions of dermal productions. The ctenoid scale, however common it may be in the order, is not uni¬ versal, and the first family, the Uranoscopes have chiefly cycloid scales. The absence of a pneumatic tube to the air- bladder is perhaps a more constant character, but the viscus itself is not always present. The ventral fins are, when they exist, placed, in the majority, near the pectorals- Order V.—ACANTHOPTERI, Mull. Endo-skeleton ossified ; exo-skeleton as ctenoid scales. Fins with one or more of the first rays unjointed or inflexible spines ; ventrals in most beneath or in advance of the pectorals. Swim-bladder without air-duct. URANOSCOPIDiE. The Uranoscopes are remarkable for their power of raising their eyeballs out of their sockets, and of retracting them again within the level of the orbits. I hey frequent the bottom of the sea, and, like many ground fish, some of them have organs of touch developed in form ot barbels, and they have also a peculiar membranous filament under the tongue, which they can protrude at pleasure. 1 he Medi¬ terranean Uranoscope was named Agnus and Callionymus by the ancient Romans, and Pliny says that the same fish was called Callionymus and Vranoscopus. Aristotle re¬ marks correctly that the gall-bladder of this fish is attached to the right lobe of the liver, and is of greater size than in other fishes; and the dramatic poets referred to it proverbi¬ ally when alluding to an angry man. Its gall was supposed to have some power of rendering the sight more clear, of re¬ moving deafness, and ot depressing the fungus growths of old sores. The species are more numerous in the Australian seas than in any other quarter of the ocean. Trachinus has some resemblance in external characters to the Sclero- genidce, especially in the simplicity and thickness of the lower pectoral rays, and in the projection of the tips of the anal rays beyond the membrane, but they are distinguished by the second suborbitar not crossing the cheek to the pre¬ operculum. The Uranoscopes, indeed, make an approach to this peculiar structure, but in them the suborbitar articu¬ lates with the upper limb of the preoperculum, and does not buttress its angle, as in the true Sclerogenids. 1 he pro¬ jecting tips of the anal rays occurring in many ground fishes are seemingly organs of touch. 1 he family gene¬ rally, as here assembled, corresponds with Cuvier s group of Jugular Percoids, but we have brought into it Hemero- ccetes, which is placed at the end of the Gobioids, next Cal¬ lionymus, in the Histoire des Poissons, and also an Aus¬ tralian fresh-water genus Gadopsis not described in that work. The internal structure of several of the genera must be investigated before the correctness of this grouping can be ascertained. None of the family are of importance as articles of food. The woodcut No. 46 represents Vranosco- pus macropygus, an Australian species, which has no fiist dorsal; the head of Bovichthys is represented by No. 45, drawn to show the branching mucoducts; a scale of Ga¬ dopsis is shown by No. 26; and one from the lateral line of Hemeroccetes by No. 43. This order, the most extensive of all for the variety of Family I.—URANOSCOPLILE. forms and number of species, includes fishes under every - Trachinidce, Bonap. Y^entrals composed of a spine and five condition that a fish can exist, whether it be with regard to jointed rays, situated before the pectorals (in Trichodon and Sillago a the freshness or saltness of the water it inhabits, its tern- little behind the pectorals). Scales cycloid, or wanting, acanthoptery- Fishes. Classifica- gii. Anus generally before the middle of the fish, and the tail often tion— considerably longer than the body. One or two dorsals ; edges of the Acanthop- preorbitar and preopercular pieces entire ; not serrated : sometimes terous a strong spine from the surface of the operculum or from the shoulder. Mouth formed above entirely by the premaxillaries with the maxillaries in the membrane behind them; teeth on the jaws and vomer; palatine teeth in some present, in others none liranchiostegals six or seven, rarely five. Abdominal cavity some¬ times prolonged past the anus; no air-bladder; cmcal stomach • pancreatic caeca three to twelve, or more, sometimes none (Hemero- Genus I. Trachinus, Linn. Head compressed ; a strong oner- cular spine. Villiform teeth on the jaws, on the anterior point ofthe vomer, on the fore end of the palatines, on the entopterygoid on the pharyngeals, and on the short tubercles of the branchial’arches. Cranium more or less rough, and the suprascapular finely denti- culated. A small spinous dorsal far forward, and not connected to the soft dorsal. Abdominal cavity of small extent Four species. Genus II. Percis, Bloch. Trachini, with the head more de¬ pressed and the spinous and soft dorsal joined ; vomerine, but no palatine teeth; somewhat of a Labroid aspect. Some were described Labn by Schneider, and Bloch named another Enchehtopus con¬ ceiving it to be a Gadoid fish. Cavity of the abdomen not exten¬ sive. Fifteen species. Genus III. Pinouipes, Cuv. The Labroid aspect of this genus is striking. Lips thick, covering the strong, conical, and somewhat curved teeth. A single dorsal spinous in front, without a notch between. Vomerine and palatine teeth. Three species Genus IV. Uranoscopus, Linn. Head large, cubical, bony rough and sculptured, depressed with the protractile eyes on the dorsal aspect. Mouth cleft vertically, so that the mandible forms the extremity when it is closed against the abbreviated snout. Sub- orbitars large, cuirassing the cheeks,but attached to the temples, and not forming a fulcrum to the spinous preoperculum as in the Sclero- genidcB. Scales small, cycloid. Nominally two dorsals, but some species want the spinous one. A humeral spine, which in some is large and crenated. Some have a barbel at the symphysis of the mandible externally, and some have a filament under the tongue within the mouth. Branchiostegals six. Stomach ceecal; pancrea- tic caeca numerous (twelve). Seventeen species. Genus V. Bovichthys. External aspect of Gottu,. Head large, depressed, rounded, with large eyes near the dorsal plane. Mouth terminal; villiform teeth on the jaws, vomer, and palatines, the outer row on the jaws being thicker and taller. No scales. Skin very porous, mucoducts disposed in branching lines on the head and strongly prominent along the lateral line. Branchiostegals seven. Fins large, the two dorsals contiguous; five lower pectoral rays, and all the anal rays, except the two posterior ones, simple and projecting beyond the notched membrane; the pectoral re¬ sembling that fin in Oottus, and the anal that of Trachinus. Oper¬ culum ending in a large flat spinous point, clothed with skin ; no other particular armature of the head; a curved spine from the front of the operculum being quite hidden by the soft parts. Genus VI. Percophis, Cuv. A long slender fish resembling Sphyr&na. Head pointed; mandible prominent; teeth strong, curved ones in front of villiform bands in the jaws ; teeth also on the vomer and palatines. Anus at the end of the anterior third of the whole length. First dorsal posterior to the base of the pectorals at a little distance fi’om the long soft dorsal; anal longer than the latter. A small opercular spine. Branchiostegals seven. Scales cili¬ ated. Abdominal cavity prolonged to a considerable distance be¬ yond the anus; stomach csecal. One species. Genus VII. Hemeroccetes, Cuv. Form elongated, slender, roundish, tapering but slightly towards the tail, with a long even dorsal and anal separated from the caudal. Dorsal rays all simple and jointed ; anal rays branched at the tips, like those of Trachinus ; ventrals before the pectorals of one spine and five jointed rays. Head depressed ; eyes large, prominent, partly on the dorsal aspect, near together ; mouth protractile, and when thrust out the upper ends of the maxillaries project upwards like spines. Branchioste¬ gals seven. Teeth setaceous, in villiform bands on the premaxil¬ laries, mandible, anterior corners of the vomer, pharyngeals above and below, and palatines. Tongue and isthmus of the’gills smooth. Head unarmed, together with the body, scaly. A row of pores on the preoperculum. Stomach cascal; intestine short, making but one flexure; no pancreatic casca. One species. Genus VIII. Gadopsis, Rich. Aspect of Gadus. Scales cycloid extending to the cheeks and gill-covers. A single dorsal with spin¬ ous rays in front; anal with three spinous rays ; one bifid, jointed ventral ray without a spine, situated far forward on the’ throat. Head unarmed. Branchiostegals six. Teeth card-like on the pre- xnaxxllaries, vomer, palatines, and mandible. A fresh-water Aus¬ tralian fish. ICHTHYOLOGY. GenusIX. Aphritis, Cuv. andValenc. Body elongated. Dorsals two, separated. Mouth rather small; close, short, villiform teeth on the jaws, palatines, and chevron of the vomer. The absence of strong-pointed teeth distinguishes this genus from Percophis; the presence of palatine teeth separates it from Percis, and the two dor¬ sals from Gadopsis ; the scales appearing to be ciliated when viewed through a lens rather throws a doubt of the propriety of placing the genus in this group. Branchiostegals six. Stomach caecal; four pancreatic casca. A fresh-water Tasmanian fish. Genus X. Tiuchodon, Stel. General aspect of Uranoscopus. (ive preopercular spines ; operculum ending in a flat point. Head flat above ; mouth descending almost vertically, and, when shut, hav¬ ing the mandible in front; eyes lateral, not on the dorsal aspect as in Lraiioscopus. No scales. Ventrals thoracic. Cheek not cuirassed by the suborbitars ; teeth in card-like bands (individually slender pointed, and recurved) on the jaws and front of the vomer, but the palatines are toothless, as is also the tongue. Two dorsals separated y a short interval; several of the lower pectoral rays simple. Inve branchiostegals. One species. Genus XL Sillago,Cuv. Acanthopteri, with along conical head and rather depressed snout, terminated by the fleshy lips of a small mouth. Two continuous dorsals, the second long and low Upper jaw somewhat protractile, and the mandible articulated con¬ siderably before the eye; teeth on the jaws villiform, with an outer row of conical ones. A villiform band on the front of the vomer • preoperculum denticulated on the ascending edge, curving over the throat so as nearly to touch its fellow. Six branchiostegals. Scales ciliated, covering the opercula, cheeks, and upper part of the head behind the eyes. Cmcal stomach ; pancreatic caeca from two to lour ; a large forked air-bladder. Ten species. Cuvier is uncer¬ tain about the proper position of this genus, but thinks that it is most allied to the Sciatnida: with which it might be placed were it not for its vomerine teeth. It is put here at the end of the Urano- scopidce chiefly because no more eligible situation offers. PERCOIDS. 273 Classifica¬ tion— Acanthop- terous Fishes. VOL. XII. Few families of fish have been more fully investigated by ichthyologists than this one, yet the vast number of spe¬ cies that belong to it is embarrassing to students, and the strong external characters which many possess have with¬ drawn the attention from the more important varieties of structure, to slight serratures of the opercular bones, or the greater or smaller size of the scales on some parts of the head, and other slight modifications of the sur¬ face, which are obvious to the eye indeed, and therefore useful for subdividing a genus containing many species, but are not of themselves sufficient to establish generic groups or other divisions of higher importance. These comparatively unimportant external characters have how¬ ever been too generally employed for this purpose, and the importance of the want of teeth on the roof of the mouth having been too rigidly insisted upon, as a variety of struc- tuie of family rank, has caused the wide separation of spe¬ cies nearly connected by aspect, habits, and general confor¬ mation. Many Percoids have been placed with the Sciae- noids merely because the minute teeth of the palate are early deciduous. On the other hand, forms have been brought together by a few technical characters which have comparatively little natural affinity, and an ichthyologist who is intimately acquainted with ichthyic anatomy hat a wide field before him where he may render great 'service by reducing the at present heterogeneous assemblages to more fitting order. In the mean time we shall, with a few exceptions, follow our principal authorities—Muller for the general arrangement, and the Histoire des Poissons for the generic groups. We have found it convenient to intro¬ duce into our table, as distinct families, the Percoids of Cuvier which have more or fewer branchiostegals than seven; or whose ventrals vary in composition from the normal number of five articulated rays, or depart from their usual position in this family under the pectorals. The useful analytical table given in the Histoire des Poissons, abbreviated by the removal of these groups, will remain as follows:— 2 M 274 ICHTHYOLOGY. table of genera. Classifica- Acanthop- Two dorsals, or one dorsal notched to its base. All the teeth villiform. Perca Lates, Enoplosus, Diploprion, Niphon, Labrax, Centropomus, Huron, Grammistes, Aspro, Ambassis, Apogon, Cnidon, Psammo- PERCA, PRIOP1S, MlCRO'iCHTHYS, BOGODA, POMA- TOMUS. Canine teeth among the others. Cheilodipterus, Lucioperca, Etelis. A single dorsal. Canine teeth among the others. Serranus, Plectropoma, Diacope, Mesoprion, Ap- RION. Teeth all villiform. Centropristes, Grystes, Polyprion, Pentaceros, Acerina, Rhypticus, Aulacocephalus, Apsilus, Glaucosoma. Fig. 92. Perca fluviatilis. The common Perch {Perca jluviatilis, Linn.), one of the most beautiful of the fresh-water fishes of Europe, is too familiarly known to require description. It inhabits both lakes and rivers, but shuns salt water. As an article of food it is still in some estimation, although the character given of it in that respect by Ausonius is higher than ac¬ cords with modern views. The female deposits her ova, united together by a viscid matter, in lengthened stiings, a peculiarity noted by Aristotle. The number of these eo-gs sometimes amounts to nearly a million. 1 he Perch occurs over all Europe, and most of the northern districts of Asia. Pennant alludes to one said to have been taken in the Serpentine River, in Hyde Park, which weighed nine pounds. But even one half of that weight would be re¬ garded as extraordinary, and Pennant reports the fact on the authority of another. Fig. 93. Labrax lupus. The fish here represented is the Labrax lupus, Basse or Sea Perch, a fish of a chaste and pleasing aspect, though destitute of the more Strongly contrasted colours of the fresh-water species. Its upper parts are gray, with bluish reflections, which gradually shade away into a silvery whiteness on the under surface. The pectoral fins are slightly tinged with red. It occurs along the Dutch and British shores, but is much more abundant in the Mediter¬ ranean. It is a voracious fish with a remarkably large stomach, and received from the ancient Romans the appro¬ priate cognomen of lupus. By the Greeks it was highly esteemed: Archestratus, even termed a large kind taken near Milet, “offspring of the gods.” They attributed to the lupus a tender regard for its own safety; and Aristotle Classifica- says that it is the most cunning of fishes, and that when tion— surrounded by a net it digs for itself a channel of escape Acanthop- through the sand. “ Clausus rete lupus quamvis immanis et acer . ^ , > Dimotis cauda submissus sidit arenis, Atque ubi jam transire plagas persentit in auras Emicat atque doles saltu diludit inultus.”—Ovid. The Basse sometimes attains the length of 3 feet, though it is seldom met with much above half that size. There is little that calls for attention from the other Percoids with two dorsals. Though interesting from the variety of forms they display, we must leave these to be studied in their leading features as given in the annexed table, and give the space we can allot to species of more importance, either objects of commerce or of large fisheries, or from the associations connected with them. In the Histoire des Poissons, the Percoids with a single dorsal form a second great division of the family ; and, were it not for the break in the close affinities between the two groups that would be caused by making this division a separate family, the number of species that it contains might render such a proceeding expedient as a mere matter of convenience. Cuvier remarks that the Percoids, in which the spinous portion of the dorsal is connected with the soft one by a sufficiently even border, is much more numerous in species than the typical division with two dorsals; and he found it necessary, therefore, in arranging them, to have recourse to characters of a sufficiently minute kind. Bloch drew his from the denticulations of the preoperculum and the spines of the operculum; but he has frequently used them without judgment, and we frequently meet in his ar¬ rangement with Labroid and Scimnoid fishes stuck in among the Percoids. The same errors exist, in greater or smaller numbers, in the works of his successors, because they at¬ tended more than they ought to have done to external characters, passing over the more essential conformities of internal structure. “ Our (Cuvier’s) precautions in separating fish whose teeth are supported by different parts of the mouth have saved us from much of this confusion, but yet there remained a considerable number of species which we could divide into groups only by employing subordinate cha¬ racters. We characterized the primary divisions by the teeth, which in some are villiform and of even height, as in Perca and Labrax ; sometimes interspersed with canines, or teeth a little higher and more pointed than the rest of the villi¬ form band. Next we looked to the operculum, the edge of whose bony piece is sometimes smooth or rounded, some¬ times terminated by two or three points more or less acute. Next we attended to the preoperculum, whose edges may be either smooth or denticulated, or armed in various ways with spines. Lastly, the bones of the jaws, smooth or scaly, furnish the final subdivisions; and to distinguish certain genera, we take characters from striking configurations of other parts of the fish.” These are the rules which the greatest of ichthyologists, whether ancient or modern, framed for his guidance in the distribution of this portion of the finny tribes. Since his labours were brought to a close many new species have been discovered, and not a few new forms described ; and we have therefore, as intimated above, relieved the overloaded Percoid group by removing some of the minor assemblages made by Cuvier himself, and placing them under distinct family appellations. It must be kept in mind, however, that the great mass ol Acanthop- teri, though exceedingly numerous in species, and present¬ ing a great variety of generic forms, vary very little in the more essential parts of structure; and that the subdivisions which their numbers have made necessary are not of the same value in the animal scale as others containing per¬ haps only one or two species in other parts of the table. The Serrani, called also Sea Perches, are numerous, Classifica- and many of them very beautiful. They abound in all the tion— warmer seas. Anthias and Merou are “mere subdivisions ^terouT of the Senus framed on the existence of scales on the jaws Fishes. and their greater or smaller size. In Esox, and many other genera, subdivisions, founded on the greater or smaller ex¬ tent of the head covered by scales, would be as numerous as the species ; but in Sevrcinus some such plan of grouping is necessary to enable the ichythologist to describe the mul¬ titude of species he has to deal with. Some of the Serrani were known to the ancients by the name of Perea, and ICHTHYOLOGY. Fig. 94. Serranus altivelis. still are called by the Roman fishermen by that of Percia, and by the Venetians by that of Sperga. The Anthias was more renowned in classical times. Aristotle says that the fishers of Sponges called it “ sacred,” because no vora¬ cious fishes came to the places which it frequented, and the diver might descend with safety. Pliny reports a singular story regarding it: The fishermen of the Cheli- donian Isles, he says, practise the feeding of this fish, always presenting themselves in the same dress until its apprehen¬ sions are lulled, and then they introduce a hook into the paste they had daily given it. As soon, however, as an Anthias was deceived so as to allow itself to be hooked, its companions came to its aid, and endeavoured to relieve it by cutting the line with their dorsal spines, shaped like a saw. “ Anthias his tergo quas non vidit utitur armis. Yim spin® novitque suo verso supinus Corpore lina secat fixumque intercipit hamum.” Off., Halieut., 46. The modern Greeks give the name of Anthias to the Gymnetrus ; and it is probable that the Anthias of yElian was the Scomberoid alalonga of the modern Italians. Family II.—PERCIDAS. Genus Perea, Artedi and Linn. Body oblong, scaly; scales ctenoid; opercular bones variously armed. Seven branckiostegals. Teeth on the vomer, and most frequently on the palatines. No bar¬ bels ; cheek not cuirassed. Ventrals of five jointed rays, thoracic or suhbrachian. Fins always amounting to seven in number, often to eight. Stomach c®cal, that is, the pyloric opening lateral; pancrea¬ tic cajca few in number and not bulky; intestinal canal little folded. («.) Two dorsals, or one dorsal with a notch extending to its base; all the teeth villiform; no canine teeth. Genus I. Perga, Guv. Preoperculum denticulated; operculum spiniferous; suboperculum feebly denticulated. Tongue smooth Fourteen species. . Genus H- Lates, Guv. Suborbitar and coracoid strongly den¬ ticulated ; coarse denticulations at the angle and lower border of the preoperculum. Three species. Genus III. Cnidon. Miill. and Trosch. Agrees with Lates in the almost total want of pseudobranchice, but is distinguished there¬ from by the entirely smooth under border of the preoperculum whose hinder border is toothed and sends out a spine beneath. Nos¬ trils remote from each other. Scapula with only one spine and the suborbitar scale bone nearly smooth. Genus IV. Psammoperca, Rich. Body a handsome and regu¬ lar ellipse, the rather small head forming the acute anterior end of the curve. Ctenoid scales rather large. Dorsal notched nearly to the base, moving in a scaly sheath. Teeth on the jaws; vomer and pa¬ latine bones crowded, rounded,granular; tongue smooth ; cheeks and gill-covers scaly; preorbitar entire on its edge, smooth ; angle of the operculum running out horizontally into a short strong spine,above which the edge of the bone is set with teeth like a comb; under limb of the bone smooth ; a small spine on the operculum. Differs from Perea in the form of the teeth and by the absence of a well-marked preopercular disk ; from Percolabrax by its smooth tongue and solitary opercular spine ; and from Lates by the absence of angular teeth on the lower limb of the preoperculum, and by the perfectly entire preorbitar. This genus might enter the group having a single dorsal. One species, Australia. ° o Genus V. Labrax, Guv. (Percolabrax, Schlegel.) Suborbi- ars and coracoid not denticulated; two opercular spinous points. A disk of villiform teeth on the tongue. Eight species. . enus VI. Gentropomus, Lacep. Operculum without spinous points. Dorsals separated by a small scaly interval. Preopercu- ium denticulated on its posterior border, with some teeth in the raised anterior edge of its disk. One species. Genus VII. Enoplosus, Guv. Suborbitar denticulated. Pre¬ operculum denticulated and armed by a strong spine; operculum vatedCOraCOld Wlth°Ut sPines- Body and vertical fins greatly ele- Genus VIII. Diploprion, Kuhl and Van Hass. Trispinous operculum ; operculum obtuse at the angle, with a denticulated line on the surface of its limb and coarse denticulations on its edge; pre- orbitar entire. One species. * Genus IX. Grammistes, Bloch. Scales minute, enveloped in mucoid epidermis. Dorsals near each other. Spinous preoper¬ culum and operculum ; no apparent anal spines. Two species. Genus X. Aspro, Guv. Body elongated. Dorsals at a little distance from each other. Snout thick, smooth, and projecting be¬ yond the mouth. Two species. r ° Genus XI. Ambassis, Commer. (G/tanda, Hamilt. Buch.) Both the anterior and the posterior edges of the preopercular limb denti¬ culated ; a recumbent spine pointing forward in front of the dorsal; operculum ending in a point; distinguished from Apogon by the contiguous dorsals, and the recumbent spine before the dorsal fin. Ao pancreatic c®ca, in which the genus departs from the ordinary 1 ercoid structure. Fourteen species. Genus *11. Priopis, Kuhl and Van Hass. Frontal border of the orbit serrated ; in other respects like Ambassis. One species. Genus XIII. MiCROiCHTYS, Rupp. General aspect and the form and position ot the fins as in Ambassis. Free border of the preoper¬ culum not denticulated; an acute ridge extending from the eye dorsal above the scaly operculum. Lateral line commencing under the first rays of the second dorsal; only two stiff rays in the anal. andible projecting a little beyond the upper jaw; orifice of the mouth moderately large, armed by a row of wholly fine teeth; no eeth visible on the palate. Gill-openings large ; branchiostegals Sicily Large SCaleS °n the b°dy’ 6aSiIy detached- 0ne species. Genus XIV. Bogoda, Bleek. Separated from Ambassis by their entire preorbital scale-bones and conical jaw-teeth, which are bigger on the fore part of the mandible. Dorsals two, united at the base; ventrals thoracic. Teeth on the jaws, vomer, and pala¬ tines. A recumbent spine before the dorsal. Branchiostegals six. Anal spines three. Pseudobranchi®. Six species. Bengal Genus XV. Niphon, Guv. Strong pointed spine at the' angle ot the preoperculum; fine denticulations on the vertical limb and coarse teeth on the horizontal edge of that bone. Three strong s’harn opercular spines; serrated preorbitar. Long subelliptical’ body Dorsals connected at the base; three anal spines. Genus XVL Pomatomus, Risso. Somewhat of the aspect of Mugil. Lye very large. Two short dorsals near the middle of the back, separated from each other; anal posterior to the last one, also short; back a little keeled in front of the dorsal. Scales ciliated as in the rest of the family, covering the cheeks and gill-covers Caudal deeply forked. Stomach c®cal; twenty-two pancreatic c®ca, long, and forming two groups ; air-bladder very large sim¬ ple, with red elliptical granular bodies interiorly. One species Genus XVII. Apogon, Lacep. Scales large, readily deciduous Vm^rnTTh °A AUU^S' D°rSaIS tW° Sh0rt) widelY separated. Villiform teeth. A double preopercular border finely denticulated Pancreatic c®ca few. J aieu. (b.) Two dorsals, or one dorsal deeply notched Long canine teeth accompanying the villiform bands on the jaws. Genus XVIII. Cheilodipterus, LacSp. Have the characters teetifon7he^lth ^ addlt.10,n of long Pointed more or less curved also on thi v ’ TS 7 the fine villiform bands, which exist also on the vomer and palatines. Preoperculum with a finely den- 275 Classifica¬ tion— Acanthop- terous Fishes. 276 ICHTHYOLOGY. Classifies ticulated line round the fore part of its hmb, as well as serratures tion- on its hinder edge; operculum entire, without spines. We, readily Acanthop- deciduous scales, and the dorsals well separated. Stomach large, terous cgecal; about three pancreatic caeca. Three species. Fishes. Genus XIX. Lucioperca, Cuv. Some of the teeth on the jaws v i i0nrr and pointed. Border of the preoperculum with a single line ^ of denticulations only, which are on the posterior edge of the limb. Scales rough. Large caecal stomach ; four pancreatic caeca, r ive Fishes. species. G enus XX u Etelis, Cuv. A single short pungent point on the operculum ; very minute serratures on the preoperculum. Curved canine teeth on the jaws, but not on the palatines. Dorsals con¬ tiguous. Scales large. Stomach a large caecal bag ; five pancreatic caeca; a large air-bladder, with its vasoganglions in little red stripes. (c.) A single dorsal; canine teeth among the others. Genus XXL Serranus, Cuv. Preoperculum rounded at the anirle, denticulated on the horizonal portion of the curve, as well as on the ascending one ; two or more spinous points on the oper¬ culum. Jaws not scaly. Twenty-six species. Genus XXII. Anthias, Bloch. Serrani of small size, and gene¬ rally brilliant colours. Head and jaws scaly, the maxillary being densely covered with conspicuous scales. Six species. Genus XXIII. Merou, Cuv. Serrani of larger size generally than Serranus proper, or Anthias. Operculum with two, or mostly three, spines. Very small scales on the mandible. One hundred and forty species. Genus XXIV. Plectropoma, Cuv. Serratures on the lower border of the preoperculum turned obliquely forwards, and some¬ what resembling the denticulations of a cock’s comb. Upper border mostly entire. In other characters Serrani. Operculum spinous. Sixteen species. . , , , , Genus XXV. Diacope, Cuv. Characterized by a rounded notch above the angle of the preoperculum which receives a small knob of the interoperculum. In other characters Serrani. I orty ^GknuS XXVI. Mesoprion, Cuv. Serrani in fins, teeth, and nreopercular denticulations, but with an unarmed operculum, end¬ ing in a smooth point, not spinous, nor pungent. Nearly allied to Diacope, and many species have even the knob of the interopercu- lum and corresponding notch in the preoperculum, but never so distinctly formed. From Dentex, which they resemble in external form, they are distinguished by their vomerine teeth and denticu¬ lated preoperculum. Fifty-four species. _ Genus XXVII. Aprion, Cuv. Canines on both jaws ; short villiform teeth on the vomer and palatines. Operculum Wlth two very small spinous points; but the preoperculum smooth-edged. It would be almost an Etelis if its dorsal were not single; or a Grystes, if it wanted the canines. Air-bladder ample. One species. (d.) A single dorsal, with villiform teeth only, and no canines. Genus XXVIII. Acerina, Cuv. Whole head destitute of scales. Muciferous excavations in the bones of the cranium ; five or six in the suborbitar chain, and more on the limbs of the mandible ; small spinous points with sinuses between, but no serratures on the bor¬ der of the preoperculum. Two anal spines. Two species. Genus XXIX. Pentaceros, Cuv. Body oval, high. Fre- orbitars, opercular pieces, cranium, and coracoid, coarsely striate . Cheek scaly. Blunt conical tuberosities over the eye and on the occiput. Scales of the body striated and granulated, and strongly adherent. Villiform teeth on the jaws and front of the vomer. Ventrals wide apart, their spine very large ; five anal spines. Csecal stomach ; nine pancreatic caeca; a large air-bladder. One species.. Genus XXX. Centropristis, Cuv. Analogous to the Serrani in the union of characters derived from a spinous operculum, and a serrated preoperculum. Differs from Polyprion in the absence of a denticulated crest on the operculum, and the want of denticula¬ tions on the preorbitar. The snout, jaws, and gill-membranes are destitute of scales, but the cranium, cheeks, and opercular pieces are scaly, the scales on the operculum being larger than those of the cheek. Fourteen species. Bonneville divides this genus into three groups: Centropristis proper, having bigger conical teeth mixed with the granular ones on the jaws, and an interior band of vomerine teeth in a chevron. It comprehends C. atrarius, tabaccarius, atrobranchus, hirundina- ceus, and brasiliensis. Homodon (Arripis, Jenyns) has card-like teeth on the jaws; an oblong, three-cornered group of vomerine teeth, and a more elongated body. C. truttaceus, georgianus (Australian fish). Myriodon, all the jaw-teeth equally minute ; vomerine teeth Classifica- in a chevron. C. seorpenoides. . tion-— Genus XXXI. Aulacocephalus, Schleg. Three spines on the Acanthop- operculum; preoperculum strongly serrated on its horizontal bor- terous der. Caudal fin rounded. One species. Genus XXXII. Glaucosoma, Schleg., Rich. Aspect Scisenoid. v. Low spinous part of dorsal, peaked soft part. Head, except e ips and gill-membrane, densely scaly. Scales on the basal half of the soft-rayed vertical fins. Technically Centropristis, but having a very different general appearance. Card-like teeth on the jaws, vomer, and palate. Scales moderately large, ctenoid. reopercu lum crenulated; two flat, bony points to the rounded operculum. Branchiostegals seven, occasionally eight. Two species. Genus XXXIII. Grystes, Cuv. Centropristis, with a smooth- edged preoperculum. Scales small, thin, embedded in the skin, extending over great part of the fins, and covering the gill-rays, throat, and all parts of the head, except the lips and the foids that shut up when closed. Notch between the dorsals equal to half their Genus XXXIV. Apsilus, Cuv. Belonging to the Percoids, with a single dorsal, but distinguished by the total absence of true spines or denticulations on the opercular bones, or those of the shoulder. Teeth very fine villiform, in a narrow band on the jaws and pala¬ tines. Seven branchiostegals. Differs from Centroprzstzs in the want of denticulations on the preoperculum, and from Grystes in having no opercular spine. Scales thin. Genus XXXV. Rhypticus, Cuv. No denticulations on the operculum or preoperculum, but short spines on both. Head smooth, without scales. Scales deeply imbedded in a muciferous skin In other characters much like Serranus. Few spines in the dorsal. A lono- caecal stomach, pointed at the end; six or seven pancreatic cseca; air-bladder oval, not large. Two species. i , Genus XXXVI. Polyprion, Cuv. Preoperculum strongly and irregularly denticulated, and the anterior border of its limb rough. A strong spiny crest traverses the middle of the operculum longi¬ tudinally, and there is a less prominent point below it; the edges of the suboperculum and interoperculum are finely denticulated The preorbitar is also slightly crenated, and there are denj£u)*te crests and tubercular eminences on the upper border of the orbit and top of the cranium, with serratures on the suprascapulars and coracoid bones, giving the head some resemblance to that of a Scor- pcena. Stomach caecal, obtuse ; two pancreatic caeca. One species. THERAPONIDiE. The preceding family of Percoids contains the genus Perea, as sketched out by Artedi and Linnaeus. I he numerous species discovered subsequent to the days of these naturalists, and accumulated in the rich Parisian museum, brought to the knowledge of Cuvier many new Percoid forms which departed more or less from the typical /W of the older ichthyologists. In the Histoire des Poissons these are mostly introduced as appendages to the normal Percoids, and contain fishes with fewer branchiostegals than seven, or with more soft ventral rays than five, or with some other striking external peculiarity bY which they can be distinguished as minor groups, but which differ little fro - the true Percoids in essential internal structure. VVe have separated one large group of these Percoid allies as they mly be called, to form the family of Therapomda, dis in- guished from the more typical Percoids by the characters indicated in the table. But in the family thus brought together, there are several minor groups very natm al m them selves, but which do not retain a general family hkenes., extending to all the groups. The first three genera are distinguished from the others by the lower rays of then pectorals being simple, and formed evidently as orSans o touch, and the next three genera are American fresh-wate fish, of much beauty and neatness of aspect. 1liese a followed by five or six genera, with generally well-armed opercular bones; then there are several newly proposed genera, in which a family aspect is less recognisai e, , lastly, ie have placed at the end of the famdy and 'Latilus, two genera associated by Cuvier with the Su®- noids, but which, notwithstanding the absence of teeth o the palate in the one, and the wholly toothless mouth of the ICHTHYOLOGY. Classifica- other, seem to be more nearly allied to certain members of tion— this group than to any other family in this system. Acanthop- J terous Fishes- Family III.—THERAPONIDiE. ^ ~ v ^ Thoracic scaly fishes. Branchiostegals six. Two dorsals or the spinous and soft dorsals united to form one fin. Scales ctenoid or cycloid. Teeth on the jaws, and most generally on the palatines and vomer. Opercular pieces variously denticulated or spinous, or some of them unarmed. Five soft rays in the ventrals, with one spine; lower pectoral rays in some genera unbranched, jointed, and prolonged beyond the membrane, but in most of the ordinary form. A rather heterogeneous assemblage of Percoids, brought together by the single character of six brauchiostegals, but differing in some having cycloid, others ctenoid scales, and even in the same genus in the presence or absence of teeth on the palate, the teeth of that part falling out when the fish is still young. Genus I. Cirrhites, Comm. Resemble .MMoprfon in their scales fins, and in having a denticulated preoperculum, and the operculum ending in a flat, smooth corner, but are distinguished by the lower pectoral rays being thickened, simple, though jointed, and elon¬ gated beyond the membrane, seemingly to serve as organs of touch, such as exist in many of the Sderogenidce. The vomer is armed' with villiform teeth, but there are none on the palatines. Stomach rather short; pancreatic caeca four ; no air-bladder. Eight species. Genus II. Aplodactylus, Cuv. Lower pectoral rays thick, fleshy, jointed, but not branched, and protruding beyond the narrow membrane at the tips. Teeth thin narrow plates lobed at the crown, in many rows on the jaws, the outer row taller than the interior ones, the newest of which are very short, and to the naked eye ra- duliform. General aspect of Orystes. Scales small, striated on the edges, covering most of the head and fins. Interoperculum scale¬ less; preoperculum smooth-edged. A small, flat, smooth opercular point. Branchiostegals six. Ventrals posterior to the pectorals, in consequence of the elongation of the pubic bones, which are at¬ tached to the coracoids. Stomach small, caecal, with an ascending pyloric branch exceeding it greatly in size ; two short pancreatic caeca; a large, simple air-bladder. Three species. Distinguished from Cirrhites by its teeth, like those of Crenidens. Genus III. Chironemus, Cuv. Differs from the Sciaenoid Chei- lodactylus in having vomerine teeth on the fore-part of the bone ; teeth generally setiform, few and feeble. Scales cycloid ; opercular pieces and cheeks covered with scales, not greatly smaller than those of the body. Preorbitar high, like that of a Sparoid. Pre¬ operculum smooth-edged, rounded at the angle; operculum with two flat points, scarcely pungent. Csecal stomach, pretty large; four pancreatic caeca. One species. Genus IV. Centrarchus, Cuv. (ZcAtAeZi's, Rafin.) Oval, com¬ pressed body. A single dorsal. Villiform teeth on the jaws and front of the vomer; on the palatines in two patches, and on the base of the tongue; no canines. Preoperculum generally entire ; angle of the operculum divided into two flat points. Anal spines from three to nine. Scales ctenoid. Nine species. Genus V. Pomotis, Cuv. A rounded, skinny, coloured lobe prolonging the operculum, whose bone ends in an obtuse angle. Pharyngeal teeth cylindrical, with flat tops, disposed in a pavement¬ like manner; villiform teeth on the jaws, and a row across the front of the vomer, but none on the tongue. Three anal spines. Stomach caecal, obtuse; pancreatic caeca six. Ten species. Genus VI. Bryttus, Cuv. Pomotes with a narrow band of villiform teeth on the tongue. Three anal spines. One species. Genus VII. Pomanotis, Guich. Body compressed, oval, high, covered with ciliated scales. Snout short and conical, but obtuse ; a moderate-sized mouth ; teeth on the jaws crowded, conical, acute, the exterior ones somewhat curved. Preoperculum, interoperculum, suboperculum, serrulated at the corners. Tongue smooth. Opercu¬ lum spinous, without a membranous border. Dorsal single; ven¬ trals thoracic. Branchiostegals six. Fresh water, Aleppo. Near Centrarchus, Pomotis, and Bryttus. Genus VIII. Priacanthus, Cuv. Angle of the preoperculum projecting in form of a flat spine, which is denticulated or crenu- lated on the edges like the rest of the bone ; resembling Anthias in the whole snout and jaws being covered with strongly ctenoid scales, which extend along the median line of the throat. No ca¬ nines, but narrow bands of villiform teeth on the jaws, the chevron of the vomer, and along the palatines. Mandible projecting at the chin. Eyes large. Six branchiostegals. Posterior orifice of the nos¬ tril a vertical slit; anterior one a small round hole. Form oval; the dorsal and anal rounded. Stomach large, ceecal, rounded poste¬ riorly ; five thick pancreatic caeca ; air-bladder of moderate size, rounded anteriorly, pointed behind. Eighteen species. Genus IX. Dules, Cuv. Centropristis by external form and in¬ terior structure, but their six branchiostegals have caused us to 277 place them in a separate group. Some have a single dorsal, and Classifica- three opercular spines ; others a notched dorsal, and only two spines tion on the operculum. Vestiges of serratures on the suhorbitar, and Acanthop- some very fine and little apparent ones on the preoperculum. terous Teeth coarsely villiform on the jaws, chevron of the vomer, pala- Fishes, tines, and tongue. Twelve species. v . ' Genus X. Therapon, Cuv. Villiform teeth on the jaws; denticulated preorbitars ; preoperculum, and often the suprasca¬ pular or coracoid, also denticulated. Six branchiostegals. No scales on the cranium, snout, or jaws. Spinous part of the dorsal folding back into a scaly furrow. Air-bladder always divided into two distinct sacs by a contraction as in the Cyprinidce, the Char- acini, and Myripristis. The palatine teeth are in some deciduous at a young age. Some have the outer row of jaw-teeth stronger than the others. Stomach caecal, pointed ; about twelve pancreatic caeca; anterior division of the air-bladder globular. Twelve species. Genus XL Datnia, Cuv., are a group merely subordinate to Therapon, and differ in having a more elevated body, a straight or concave profile, a pointed snout, and by the dorsal spines being stouter, and occupying a greater length of the back, though not more numerous. The dorsal is slightly notched, and they have no teeth on the palate. Stomach caecal, rounded behind. Three species. Genus XII. Pelates, Cuv., is a third division of Therapon, and is distinguished by a more even dorsal, less notched, and by the operculum ending in two feeble points, scarcely to be felt through the integument. Snout somewhat obtuse; mouth small; jaws equal; teeth villiform in three or four rows, hut none on the vomer or palate. Three species. Genus XIII. Helotes, Cuv. A fourth division of Therapon, having like the first one a deeply-notched dorsal, and an opercular spine. Body oblong. Head small; mouth narrow, as in the third division ; exterior row of teeth minutely tricuspid ; no palatine teeth. Two species. Genus XIV. Datnioides, Bleek. Distinguished from Therapon, Batnia, Pelates, and Helotes, by the suhorbitar scale hones not being notched, and by a simple swim-bladder. Dorsal fin simple. Premaxil¬ lary and mandibular teeth simple, pluriserial; no canines. Vomer and palate smooth. Preoperculum denticulated, without larger spines; suborbitars edentate. Branchiostegals six; lips membra¬ nous, entire, not fimbriated. Head scaly above ; snout scaleless. Genus XV. Badis, Bleek. Separated from Nandus by the en¬ tire preoperculum and toothless tongue. Dorsal fin single. Teeth on the jaws, palatines, and entopterygoids ; tongue smooth ; suborbitar scale bones and preoperculum not toothed. A single opercular spine. Branchiostegals six. Lateral line interrupted. Upper jaw protractile; inferior pharyngeals oblong, contiguous, but not united. Genus XVI. Nandus, Cuv. Mouth protractile; teeth villi¬ form, very close and short on the jaws, palatines, and chevron of the vomer. Preoperculum and interoperculum finely denticulated on the edge; opercular spine so small as to be easily overlooked. Scales smooth, cycloid. Intestines resembling those of a Labroid; stomach siphonal, with a very short ascending branch; no pan¬ creatic caeca; air-bladder simple. One species. Genus XVII. Catopra, Bleek. Dorsal solitary. Setaceous teeth on the jaws, palatines, and vomer; pterygoid and lingual teeth granular, in an oblong patch. Preorbitar scale bone and pre¬ operculum denticulated ; two flat spines on the operculum. Bran¬ chiostegals six. Lateral line interrupted; upper jaw protractile. Bleeker makes a family group of this genus and Nandus, and in¬ deed the position of Nandus, with its siphonal stomach, and want of pancreatic caeca, does not seem to be with Therapon. Genus XVIII. Anoplus, Schleg. Distinguished from Datnia by having vomerine teeth ; from Nandus by the want of palatine teeth. Branchiostegals six. One species, A. banjos. Genus XIX. Boleosoma, Dekay. Two dorsals. Smooth-edged preoperculum ; operculum scaly, with a spine. Branchiostegals six. Nape narrow, compressed. Rivers, New York. Genus XX. Pileoma, Dekay. Two separated dorsals. Smooth preoperculum. A flat, weak, opercular spine. Ventrals with five soft rays. Teeth of equal size. Lake Champlain. Genus XXL Lepisoma, Dekay. Body and fins scaly. Fleshy appendages along the lower edge of the head and round the eyes. One dorsal. Branchiostegals six. Teeth on the jaws, vomer, and palatines. Ventrals before the pectorals. One species. Florida. Not having access at present to the works in which Dr Dekay has described these three fresh-water genera, we merely give the generic characters, as quoted in the Archiven fiir Naturgeschichte for 1844 ; and cannot therefore, without more data, fix their proper place in the system. Along with these genera, ranged in the family of Theraponida, we place part of the Scisenoids, “with fewer than six branchiostegals,” described in the Histoire des Poissons. Their abstraction from the Scimnoids renders the characters of that group more precise, and they are separated from the Theraponidw 278 ICHTHYOLOGY. Classifica- more by the toothless palate than any difference of form or general tion structure. Acanthop- Genus XXII. Lobotes, Cuv. Branchiostegals six. A single terous^ dorsal; thoracic ventrals with five soft rays. Body, opercular Fishes pieces, and cheeks scaly. Snout short; prominent mandible; profile of face somewhat concave. Very coarse denticulations on the pre¬ operculum. Soft portions of the anal and dorsal prolonged in such a manner that posteriorly the fish appears to be trilobate, the round¬ ed caudal forming the middle and longest lobe ; entire form oval and thickish. Spines of the fins strong, and those of the back re¬ clining in a scaly furrow when at rest. Four pores, or four groups of minute pores towards the end of the mandible. Scales ciliated. Lateral line continuous. Stomach ccecal, very large, and fleshy ; three pancreatic caeca ; large oblong air-bladder. Four species. Genus XXIII. Scolopsides, Ouv. Connected with the Sciae- noids, and especially with Pristopoma and Liagramma by the den¬ ticulations of the preoperculum ; but there are either no pores on the end of the mandible or only very minute ones, easily overlooked. The peculiar generic character consists in the second suborbitar scale bone ending in a spinous point, close under the orbit, pointing backwards; and the third bone of the chain frequently sends out one in the opposite direction which meets it. Body oval or oblong. Dorsal continuous in outline. Eye large. Mouth moderate. Scales pretty large, extending to the occiput, opercular pieces, cheeks, and throat. Dorsal spines reclining on a scaly furrow, and having their broader sides turned alternately to the right and left, as in many Sciaenoids and Sparoids. Caudal notched or forked. Stomach caecal, rounded, very small ; pancreatic caeca six thick, as long as the stomach ; air-bladder simple. Twenty-two species. Genus XXIV. Heterognathodon, Bleek. Scaly fishes. Dor¬ sal solitary. Branchiostegals five. Rays of the pectoral entire. Suborbitar scale bones smooth, without spines. Preoperculum den¬ ticulated ; a solitary opercular spine. Premaxillary teeth bristle¬ shaped, pluriserial, with four canines anteriorly; mandibular teeth also pluriserial and bristle-shaped, with two canines, and a row of conical teeth behind. Batavia. Genus XXV. Macquaria, Cuv. General form Percoid, with the muciferous excavations of the bones of Acerina. No teeth. Branchiostegals five. A pit and two small pores beneath the end of the mandible as in many Sciaenoids. Preoperculum, subopercu¬ lum and interoperculum, suprascapular and coracoid, finely denti¬ culated or serrated ; operculum terminated in two thin, flat, bony points. Scales rough, ciliated. Stomach caecal; eight pancreatic caeca; air-bladder either absent or very small. One species. Genus XXVI. Latilus, Cuv. Forms in the division of Sciae¬ noids, with an undivided dorsal, as given in the Histoire des Poissons, a genus remarkable for its arched profile descending almost verti¬ cally, the very short snout and large eye, near the profile. Hori¬ zontal mouth reaching the front of the eye, and a general form of the tapering body, resembling Coryphcena. Teeth, a cross band in front of the vomer, none on the palatines ; four or five larger curved teeth in front of the villiform band on the jaws. Branchiostegals six. Peroperculum very finely denticulated; operculum ending in a single point. Suprascapular smooth. Dorsal rays slender, flexible. Scales minutely ciliated. Lateral line straight, continuous. Stomach caecal; one pancreatic caecum only observed ; air-bladder simple, large. One species. POLYNEMIDS. market weighs upwards of two ounces, and the isinglass is Classifica- considered to be very good, and fetches from 25 to 30 tion Spanish dollars the pikul. The prepared air-vessels are Acanthop- known in eastern commerce by the name or r ish-maws, -piHh<,g and in 1842 between 12,000 and 13,000 dollars worth were exported from Prince of Wales Island (Singapore). They are not obtained exclusively from the Poli/nemus, though its isinglass is among the best. Dr Cantor, from whom these particulars are quoted, says that the fishery is carried on in a very rude manner, chiefly by the Chinese, and might be almost indefinitely extended by European capital and skill. Family IV.—P0LYNEMIDA3. Acanthopterygians with abdominal ventrals, a position re¬ sulting from the elongation of the pubic bones which are suspended to the coracoids. Teeth on the jaws, front of the vomer, and pala¬ tines, Two dorsals; scaly appendages in the axillae of the pec¬ torals and ventrals. Scales ctenoid, feebly ciliated. Pancreatic caeca. Genus I. Polynemus, Linn. Body oblong. Head covered, even to the branchiostegal membrane, with deciduous scales. Preoper¬ culum denticulated. Villiform teeth on the two jaws, front of the vomer, and on the palatines; tongue short and broad, smooth. Wide gill-openings; seven branchiostegals. The two openings of each nostril near to one another and near the end of the snout. Dorsals widely separated, the second one being distant also from the caudal, and corresponding in position with the anal; caudal forked, generally unequal. Small scales on the three vertical fins, and on the base of the pectoral; a number (varying with the species) of the under pectoral rays free, long, and filiform, separated from the rest of the fin by a scaly space. Anal spines, one, two, or three. Stomach obtusely csecal; several pancreatic casca (six or more); air-bladder large, pointed, and entering among the muscles of the tail ; in some species the air-bladder is wanting, in others that viscus has many (from twenty to thirty) processes on the ventral sur¬ face. Sixteen species. With this we associate a Sciaenoid genus, which has had no other more appropriate place assigned to it as yet, and which has many characters in common with Polynemus. Genus II. Cheilodactylus, Lacep. Sciaenoids with an oval compressed body ; small mouth ; villiform teeth, or conical, scarcely acute, on the jaws only, and not on the palate. Preorbitars and pre- opercula without denticulations. Numerous dorsal spines, and ven¬ trals attached under the middle of the pectorals, but with the pubic bones suspended from the coracoid. Branchiostegals six, more rarely five only. Stomach caecal; pancreatic caeca two, short; rec¬ tum dilated, muscular. The lower pectoral rays, to the number of six or seven, are simple, and one of them commonly thicker than the rest, is elongated into a filiform tip, which often reaches the end of the anal. Caudal forked. Many have a slight prominence before the orbit, and in one or two species it rises in a conical form. Eight species. Genus III. Latris, Rich. A division of Cheilodactylus, with generally more-elongated elliptical bodies, and none of the simple rays of the pectoral passing the membrane. The ascending limb of the preoperculum is minutely serrated in some, and smooth in others. Three Australian species. This small family has relations with the first group of the Theraponidce, in the existence of long feeler-like rays in the pectorals. In one species of Polynemus, the long free pecto¬ ral rays have obtained for it the appellation of Paradise-fish, from the resemblance these filamentous rays bear to the tail- feathers of a bird of Paradise. Polynemus is also remarkable as being a genus, otherwise natural, of which the species ex¬ hibit great varieties in the form of the air-bladder. In some, that viscus is lobed posteriorly, and fringed on the sides with many pointed processes; in other species, the air-bladder, though large, is quite simple, and in others there is no air- bladder at all, just as it is wanting in some species of Scom¬ ber. The Polynemus indicus, which has a large air-bladder with from twenty-eight to thirty-five of these lateral append¬ ages springing from it, and also a very great number of pan¬ creatic caeca divided into two bundles, furnishes most of the isinglass that is procured at Penang. The weight of this fish is commonly from 4 to 6 lb., and seldom exceeds 20 lb. The air-vessel of a good-sized fish when dried and ready for the SURMULLET FAMILY. The fishes of this family were denominated TpiyXr] by the Greeks, and mullus by the Romans. The Greek name is said to have originated in the three spawning seasons attri¬ buted to the Surmullets, and they were dedicated to the tergeminous or tricipitous goddess Hecate. The Latin name had another origin according to Pliny—a colore mul- leorum calceumentorum, from the red-coloured shoes or buskins worn by the kings of Alba, and afterwards by the consuls, praetors, and curule ediles. By the luxurious Romans, the Surmullets were held in such repute that they sought for them far and wide, and without regard to expense. They seldom exceeded 2 lb. in weight, and the purchase of a large one, the price augmenting in a greater ratio than the size, was considered to be an act of magnificence. A Surmullet of 3 lb. weight was an object of admiration, and one of 4 lb. entailed ruin on the purchaser. ICHTHYOLOGY. Classifica¬ tion— Acanthop- terous Fishes. “ Mullus tibi quatuor emptus Libraruin, ccenae pompa caputque fuit, Exclamare libet, non est hie improbe, non est Piscis: homo est; hominem, Calliodore voras.” Martial, 1. x. 31. Genus III. Acropoma, Schleg. General aspect of Aful/wa, but distinguished by the want of barbels. Anus nigh the ventrals, at a wide distance from the anal fin. Jaw-teeth pointed, the foremost being canines. Branchiostegals seven. Seneca relates the history of a Surmullet that was presented to I iberius, and which that emperor, in a fit of economy, HOLOCENTRIDES. sent to the market. Apicius and Octavius were competi- rp, . tors for it, and the latter became the purchaser at the cost ^ . sma^ family consists of that division of Cuvier’s of 5000 sesterces, or upwards of L.40 sterling. Asinius Perco'ds whose members have more than seven branchio- Celer paid 8000 sesterces for one in the reign of Caligula. ®teSals’ antl wll0se s°rt ventral rays exceed five. The group The high-priced fish were brought from a distance, as nafura^ one> a^ tj16 species having a common likeness they did not thrive in ponds, and increased little there in "hich is very recognisable. I hey are the only Acanthop- weight, though extraordinary pains and expenditure were ^erj which have this unusual number of rays in the ventrals, employed in the endeavour to rear them. It was one a, are ^s^es remarkable for the brilliancy of their colours, of the luxuries of a giver of feasts to cause these fishes nea^ness their forms, and their very ctenoid scales, to swim down streams led through the banqueting room, a^ey are not t*ie objects of any special fishery, that his guests might enjoy the sight of their brilliant colours during their repast, or to let them die in glass vessels, that all the varying hues of the expiring fish might glut their eyes. Seneca says the fish swim under the very couches of the guests, and they are caught under the table that they may be the sooner placed upon it, for no Surmullet was considered to be fresh unless it expired in the hands of the guests. They were exposed in vessels of glass, that the different colours they assume during a slow and painful agony may be noticed. Nothing was considered to be more beautiful than a dying Mullet. The struggles of the fish to escape death bring out the most brilliant scarlet tints, which are followed by a general paleness ; and in the passage from life to death these two extreme tints mingle, says the author from whom we borrow, in the most agreeable manner. The liver of the Surmullet was considered to be the most deli¬ cious part, and was bruised in wine to make a garum for the flesh. Even in the present day the Surmullet is consi¬ dered to be one of the best of sea-fishes—its flesh being white, firm, tender, of an agreeable flavour, and easily digested because it contains little fat. The scales of the Surmullets are strongly ciliated. Fig. 95. Mullus barbatus. Family V.—MULLIDJE. Les Mulles, Cuv. A perfectly natural family, distantly allied to the Percoids, but readily distinguishable from other Acanthopterygii by the two dorsals, widely separated from one another, by the large and easily-detached scales of the head and body, and by the pair of symphysial barbels of the mandible which retire between the limbs of that bone when not in use. Body oblong, little com¬ pressed. Fins of moderate spread. Profile more or less convex above and below. A high narrow preorbitar ; small mouth, with feeble teeth. Gill-opening wide; four branchiostegals. Mucoducts form¬ ing the lateral line divided into a cluster of branches on each scale. Siphonal stomach ; numerous pancreatic caeca. Genus I. Mullus, Linn. No teeth on the upper jaw; a disk of pavement-like teeth on the front of the vomer. No spine on the operculum. No air-bladder. Two species. Genus II. Upeneus, Cuv. Short teeth on both jaws, sometimes closely villiform (Upeneoides, Bleek.) sometimes distinct and uni¬ serial (Dpmetss, Bleek.) Some have villiform teeth on the palate or vomer; in most these bones are destitute of teeth. Thirty-eight species. Family VI.—HOLOCENTRILLE. Holocentrini, Bonap. Acanthopterygians, with more than five branching rays in the ventrals, and seven branchiostegals. A na¬ tural group, recognisable by the large, very strongly-toothed or serrated scales, the furrows and streaks on many of the bones of the cranium, face, and gill-cover, the serratures on the edges of the opercular pieces, and the general stoutness of the spines of the fins. Cheeks scaly. Dorsals single, or deeply notched, or two contiguous dorsals. Small spines above and below the caudal; dorsal spines falling back into a furrow. Otolites large. Air-bladder connected with the otocrane by an ossicle and a tympanum closing the orifice • stomach cascal; numerous pancreatic caeca (eight to twenty or more). Genus I. Myripristis, Cuv. Somewhat of the aspect ot Apo- gon. Cranium sculptured. Dorsals two, contiguous, or one deeply notched. Preoperculum with its border serrated, and also a ser¬ rated line in front of the limb, but no spine at its angle, by which it is distinguished from Holocentrum. Villiform teeth on the jaws and front of the vomer, with a few bigger ones in frontof the jaws of a short obtuse conical form. Tongue smooth. An acute oper¬ cular spine. Stomach caecal, reaching the middle of the cavity of the abdomen ; nine pancreatic caeca ; a fibrous exterior coat of the air-bladder, which is large, and divided into two by a contraction. Fourteen species. Genus II. Holocentrum, Cuv. Myripristis with a strong spine at the angle of the preoperculum. Dorsal slightly notched. Third anal spines generally very large. Otocrane not always connected with the air-bladder, which is simple and extends the whole length of the belly, and is not forked anteriorly. Stomach caecal; eight pancreatic caeca. Twenty species. Genus III. Beryx, Cuv. Holocentra with a very large eye, but differing in having a single dorsal, with only slender spinous rays in front, and without any notch of separation. Anal spines not re¬ markable for size. Stomach caecal, cylindrical, obtuse; ascending branch fleshy. Long, slender, numerous pancreatic caeca; air- bladder wide, and running the whole length of the abdomen. Four species. Genus IV. Rhynchichthys, Cuv. General habit of tfo/ocen- trum, but with the cranial crests prolonged anteriorly into an acute snout, somewhat resembling that of Macrourus. A projecting spine at the angle of the preoperculum ; strong denticulations on its bor¬ ders, and also round the posterior edge of the operculum, but no strong spine in the latter. Two species. MAILED CHEEKS. The three Linnaean genera, Trigia, Coitus, and Scor- pema, are the foundations of this numerous family, so re¬ markable for the variety of forms it offers; for the beauty of some, from the splendour of their colours, the elegant arrangement of their tints, or the gracefulness of their fins ; and for the ugliness of others of disagreeable shapes, and having loose disgusting skins. Few fishes are so handsome, or more delicate in appearance than Pterois, whose fins resemble the long feathers of the gayest birds, while Pelor and Sgnanceia are about as ugly as a fish can be. The fol¬ lowing table of the genera is taken from the Histoire cits Poissons. 279 Classifica¬ tion— Acanthop- terous Fishes. 280 ICHTHYOLOGY. Classifica¬ tion— Acanthop- terous Fishes. TABLE OF GENERA. No free rays in advance of the dorsal. Two dorsals. A parallelepiped head. Free rays beneath the pectoral. Trigla, Prionotus. Peristedion. Long rays beneath the pectorals, united to form great fins used as wings. Dactylopterus. No detached rays under the pectorals. Cephalacanthus. A round or depressed head. Ventrals under the pectorals. Cottus, Hemitripterus, Bembras, Aspidophorus. Ventrals behind the pectorals. Platycephalus. A single dorsal. A compressed head. Villiform teeth on the jaws, vomer, and palatines. IlEMILEPIDOTUS, BlEPSIAS, APISTES, SCORP.ENA, Se- BASTES. Teeth on the jaws and front of the vomer, but not on the palatines. Pterois. Some small teeth on the jaws only. Agriopus. A large head; monstrous in appearance; eye on the dorsal aspect. Villiform teeth on the jaws and front of the vomer. ■Pelor. Free spines replacing the first dorsal. Body scales large and imbricated; eight branchiostegals. Monocentris. Body mailed by plates on the lateral line; three branchi¬ ostegals. Gasterosteus, Spinachia. Fig. 96. Trigla pleuracanthica. The Trigla: or Gurnards are too well known to need a description ; at the same time they convey a good idea of the general form of one of the lead¬ ing tribes of the family, and one in which the characteristic develop¬ ment of the second suborbitar scale bone is well seen. This bone in all the Sclerogenoids either covers the whole cheek, or sends a process across it to the curve ot the preoperculum opposite to the spine at the angle, to which it serves as a point of resistance when the spine is used as a wea¬ pon. This elongation of the sub¬ orbitar is often crested by an acute ridge, and is most commonly armed with spinous points. The air-blad¬ ders of the Gurnards are variously lobed, and some of the species have been noticed to emit a grunting noise when caught, which some observers have supposed was produced by that organ ; but it is the charac¬ ter of the otdei to have no air-uuct to the swim-bladder. The flesh of the Gurnard is very white, firm, and wholesome. The common Dactylopterus or Flying-fish of the Medi- Fig. 97. Trigla pleuracan thica scale from the lateral line. terranean {Trigla volitans, Linn.), is a species too remark- Classifica- able for its functions, so opposite to those of its class in gene- tion— ral, not to have attracted from an early period the attention of Acanthop- mankind. It is extremely common, and has been men- £e.r?us tioned by all the authors who have treated of the fishes of v 18 es't that inland sea. The ardour with which it is pursued by the Dolphins and Bonitos, the sudden effort which it makes to escape these predaceous creatures by vaulting into the air, the newr and probably unthought of dangers which there await it from gulls and other aquatic birds, render it an object of the highest interest to the unaccustomed lands¬ man, somewhat wearied with the monotony of a sailor’s life. “ It is by the extension of the pectoral rays and mem¬ brane that the fish is enabled to raise itself from its proper element to the regions of the air, though this is by no means a continual flight, for the utmost it can do is to describe an arc over the surface of the water extending to a distance of about 120 feet, and sufficiently elevated for the fish some¬ times to fall on the deck of a large vessel. This power of flight or momentary suspension would be much greater if the pectoral membrane could preserve its humidity longer, but it is soon evaporated in the heat of the tropics; and the membrane, as it becomes dry, loses its buoyant power, and the fish falls. They are sometimes so numerous as to afford much pleasure to the spectator by their repeated flights; and at particular times, especially on the approach of rough weather, in the night, numbers of them may be seen, by the phosphoric light they emit, marking their arched pas¬ sages in apparent streams of fire.” Such is the current account of the flights of this interesting fish, and of the causes of it; but it is probable, as has already been ob¬ served of the Exocaiti, that the Flying-fishes do not soar into the air merely when pursued by their enemies, for this would only be incidere in Scyllam cupiens vitare Charyb- dim, but also to subserve some purpose in their economy. I he Cotti are characteristic members of another group of the Mailed Cheeks. The fresh-water species of this genus have the head almost smooth, and only a single spine to the preopercle. Their first dorsal is very low. The most common is the river Bull-head {Cottus “gobio, Linn.), sometimes called the Miller’s Thumb. It is*a small dark- coloured fish, 4 or 5 inches in length, and frequent in most of the streams of Europe and the north of Asia. It usually lies concealed beneath stones, from whence it darts w’ith great rapidity upon its prey. It is said to be extremely pro¬ lific ; and the female, when with spawn, becomes so greatly enlarged, that her ovaries protrude like mammae. The Bull¬ head, like the Salmon, has a reddish hue when boiled. It affords a good and wholesome food, much sought after by the mountain tribes of several countries. The ScorpcBiice site found in all seas in considerable num¬ bers, and present a great variety of aspects, some being nearly as ugly as a Pelor, while others passing, as it were, into the nearly allied genus Sebastes, have a Percoid neat¬ ness of appearance. The species here figured is an Aus¬ tralian one, Scorpccna Stokesii. Fig. 98. Scorpcena Stokesii. The Platycephali may be considered as elongated and greatly depressed Scorpavue. The subjoined representation JZhop. oi P^Vkalus ctrrhonasus will give a good idea of the terous Fishes. ICHTHYOLOGY. Fig. 99. Platycephalus cirrhonasus. form of one, which, however, is not so flatly depressed as many others of the genus. They are common ground-fish m the southern hemisphere. Fig. 42 gives a view of a scale from the lateral line of the same species. Synanceia hornda, as the title implies, exhibits by no means an in- vitmg aspect. It is named Ikan-swangi, or Sorcerer-fish, bv the Malays. S. brachio of Cuv. is the species called Fi-fi or Hideous, by the Negroes of the Isle of France, who hold it in great abhorrence. In fact, nothing can be conceived more frightful. At first sight no one would consider it a nsh, but rather as a mass or unformed lump of corrupted jelly. “ Totum corpus,” says Commerson, muco squalidum et quasi ulcerosum.” Its head and members seem en¬ veloped in a sack of thick, soft, spongy skin, warty and wrinkled like that of a leper, and irregularly blotted over with various tints of brown and gray. Sometimes it ap¬ pears entirely black; but it is always gluey and disgusting to the touch. The little eyes are scarcely discernible in the large cavernous head. This species is said to possess great tenacity of life, and survives for a long time out of t,’eJv^ter* rile skin) in fact, forms a little ring like that of 1 elor above the point of the operculum, through which the fish can respire at pleasure, leaving the remainder of the gill-opening closed, and the gills consequently little ex¬ posed to exsiccation. The inhabitants of the Isle of France regard tin's fish as a reptile, and dread its sting, meaning the wounds inflicted by its spines, more than that of snakes or scorpions. The genus Apistes was so named by Cuvier from the trea¬ cherous way in which these fishes conceal the moveable pre- orbitar spine, by laying it along the cheek, and on any one attempting to seize them, raising it suddenly so as to inflict a disagreeable wound. The Greek word from whence the name was derived signifies “ perfidious.” Since Cuvier’s time several species have been discovered possessing this sub- orbitar weapon, but varying considerably in the rest of their form from Apistes, as described by him. One of these new forms is Choridactylus multibar bus, of which a figure (fio-. 9) has been given. Some of these Apisles, having large pectorals, are able to sustain themselves in the air for a time, as Flying-fishes. One of the remarkable forms of the family is represented by fig. 14. It is the Monocentris Japonica. i he Gasterostei differ from the rest of the family in having the spines of the dorsal free and detached. The species are small fishes familiarly known under the name ot Sticklebacks (Scotice, Benticles), and extremely com¬ mon in all the fresh waters of Europe. Gesner indeed as¬ serted that they did not occur in Switzerland; but the contrary has been long since ascertained. Our most com¬ mon species is G. aculeatus (Linn.), under which name, however, it is supposed that more than a single kind has been confounded. It is an active and greedy little fish extremely destructive of the fry of other species, and con¬ sequently injurious in ponds where these are sought to be preserved. Mr Henry Baker informs us that it will sprino- not less than a foot perpendicularly out of the water and to a much greater distance in an oblique direction, when it YOL. XII. ZOl desires to overcome any opposing obstacle. “ It is scarcely Classifica- to be conceived,” he adds, “what damage these little fish tion- clo, and how greatly detrimental they are to the increase of Acanthop- a tlle fish in general among which they live ; for it is with t?rous the utmost industry, sagacity, and greediness that they seek Flshes- out and destroy all the young fry that come in their way winch are pursued with the utmost eagerness, and swal¬ lowed down without distinction, provided they are not too arge; and m proof of this, I must assert that a banstic- kle which I kept for some time, did, on the 4th of May, de¬ vour, in five hours’ time, seventy-four young dace, which were about a quarter of an inch long, and of the thickness of a horse hair. Two days after it swallowed sixty-two • and would, 1 am persuaded, have eat as many every day’ could I have procured them for it.” The Stickfeback sometimes swarms in prodigious numbers. Pennant states that at Spalding, in Lincolnshire, there are once in seven years amazing shoals, which appear in the Welland, comino- up the river in the form of a vast column. This concourse is supposed to arise from the multitudes which have been washed out of the fens by the floods of several years, and which collect in deep holes, till, overcharged with numbers they are obliged to attempt a change of place. The quantity may perhaps be conceived from the fact, that a man em- ployed m collecting them, gained for a considerable time four shillings a-day by selling them at the rate of a half¬ penny a bushel. Some of the Gasterostei live indifferently in salt or fresh water, and the one represented by figure 13 was taken by Sir Edward Belcher, in the sea at the north end of Wellington Sound, in Lat. 77° N. M. Coste who studied the manners of these small fishes in the Me¬ diterranean, relates that on the approach of spawning time, t le male builds a nest of stalks of grass and other matters in a hollow of the bottom, a little above three feet wide and about six inches and a half deep, creeping over the ma¬ terials on his belly and cementing them with the mucus that exudes from his skin. The bottom of the nest is first laid, then the sides are raised, and lastly, the top is co¬ vered over. A small hole is left on one side for an entrance. When the erection is complete, he seeks out a female, and conducting her, M. Costa says, with many caresses, to the nest, introduces her by the door into the chamber. In a few minutes she has laid two or three eggs, after which she bores a hole on the opposite side of the nest to that by which she entered and makes her escape. The nest has now two doors, and the eggs are exposed to the cool stream of water vvhich entering by one door flows out at the other. Next day the male goes again in quest of a female, and sometimes brings back the same, sometimes finds a new mate. This is repeated until the nest contains a considerable number e»gs> and each time the male rubs his side against the female and passes over the eggs. Next the male watches a whole month over his treasure, defending it stoutly against all invaders, and especially against his wives, who have a great desire to look at the eggs. When the young are hatched and able to do for themselves, his cares cea*e Mr Lecoq made similar observations at another place but the Italian society to whom the papers of the two obser¬ vers were transmitted, after inquiring fully into the case decreed that the right of priority belonged to M. Coste! { Archieen fur Naturg.) Family VJL—SCLEROGENIDAl. Joues cuirassees, Cuv.; Cataphractoridas, Cant.: Trialidce Bonan • Cdtaphracn, Heck.; Scleroparei, Buccceloricatoe, &c. ’ P ’ he distinctive character of this group is the prolongation of the the nrenUb0rbl S.Cal.e;b°ne aCr0SS the cheek to be articulated with 7 c,urve’ s°as to serve f°r a t0 the CaHahleW L r of that bone. Forms exceedingly strnns ell laving a amily resemblance in their prevailing mon¬ strous character, feeveral genera have fewer than five rays in the entrals, an uncommon occurrence among Acanthopteri. 2 N 282 ICHTHYOLOGY. Genus I TRIGLA, Linn. Cheek wholly covered by the enor¬ mous second suborbitar, which is articulated by an immoveable su¬ ture to the preoperculum, the two moving together; sides of the lure to xi 1 t Rnrlv scalv Two dorsals. Three free un- i^neheTarticulated Jys under the pectoral. Snout formed by the union of the prefrontals, turbinals, and point of the nasal, by su- ure L preorbitar making a more or less salient projection before them Branchiostegals seven. Branchial rakers in form of tube - des • villiform teeth on the jaws and pharyiigeals, but the Palat® and ’tongue are edentate. Lateral line straight to the caudal, on whUfnrks • it is variously armed. Stomach cmcal; pancreatic ^cfnlels (right to twelve), dividing into two or three lobes ’"‘e ENtis'l 1. 'pri'mctcS'ouv. Trigla, with very large pectorals and villiform palatine teeth. Body scaly. Eight species. Genus III. Peristedion. Lacep. Body clothed in scaly ar¬ mour A long projection of the preorbitar on each side of the snout. Mouth beneath ; destitute of teeth, as are also the vomer, palatines and pharyngeals. Under lip bearded. Body octagonal, with tapering spines on its eight angles. Two free rays under the pectoral. Pan¬ creatic creca seven ; air-bladder pretty large simple. Two species. Genus IV. Dactylopterus, Cuv. Head flat above, rounded off into a nearly vertical face ; helmet granulated. Ly e i erj arSe- very long spine continued from the lower border of the preoperculum. Sup^pila emitting a long spine ; articulation of the .uhorb.t.r and preoperculum moveable. Teeth pavement-like on the jaws no teeth on the vomer or palatines. Branchiostegals six ; foul^ticu- lated rays only in the ventrals in addition to the spine. Lo free rays in the pectoral, but the fin is divided into a jailer anterior part and a posterior very broad and long part with the tip. rays tming beyond the membrane ; some of the anterior dorsal rays are See ° Scales of the body hard and firm, those on the flanks keeled forming, by their close succession, trenchant crests. &ton|ach cfficalabout thirty pancreatic cseca in two bundles; air-bladder small deeply bilobate. Two species. Genus ^Cephalacanthus, Lacep., is a Vacfyiopterus wit - out the wing-like supplementary pectoral, or a TVigZa without the free rays. Head and body like Dactylopterus, of which it is said by Dumeril to be merely the young. An acute and very long spine from the angle of the preoperculum, and another from the supia- scapula both serrated. Pectoral divided into two nearly equal lobes by \ fissure. A pointed caeca! stomach; innumerable pancreatic cjEca * no air-bladder. On© sp©ciGS. j v. ^ Genus VI. Cottus, Linn. A large rounded or depressed head, variously armed with spines and tubercles. No scales. Two dor¬ sals Teeth on the fore-part of the vomer ; no teeth on the pala- SI. sfx branchiostegals! Five, four, or fewer r.ysm the v.ntc.U; inferior reys of the pectoral unbr.nched as creatic caeca few in number ; no air-bladder. Thirty-six Various dismemberments of this genus have been made, and the fresh-water and marine species have been separated—Urantdea ing the name given to an American fresh-water species, and Acan- thoeothus to the marine ones. . In the fully armed head of a Cottus there are ten spinous points more or less produced on each side of the head ; one on the turb- nal • five on the preoperculum, the one at the angle being a long spine, and°the others angular points of the inferior l-,b; one on the inferior anterior angle of the suboperculum; a spme at the point of the operculum, and acute points or spines on the supra scapula and coracoid. There are also four enunences placed in a quadrangle on the top of the head, one behind each orbit, and another on the occiput on each side. In some these are blunt and smooth in others spinous ; in others rough tubercles, much elevated °r en branched. In other species many of the spinous points are ob o ete Genus VII. Trachydermis, Heck. (Centndermichthy., Ki .) General form that of Cottus-, head less depressed lurbinals, preoperculum, and inferior angles of the suboperculum spinous theprincipalpreopercularspine-hooked. Beneath it two acu e spin and a blunt point; operculum and preorbitar unarmed. \ illiform teeth on the jaws, palatines, and chevron of the vomer ; pharyngea teeth rather coarser, the upper ones forming a tuft, on _eac 81 e- Dorsals contiguous ; pectorals like those of Coitus, \n ith simp e ra} s below (seven) ; ventrals having four jointed rays and one spine. Branchiostegals six. Body covered with slender setaceous spines, each springing from a minute cuticular tubercle. Head, belly, ax¬ illae of the pectorals, and a narrow line along the base of the anal, smooth. A genital papilla ; pancreatic caeca. Species 2V. ansata, China. . „ Cottus asper (Fauna Bor. Amer.) seems to be a second species ot Trachydermis, with the spines on the same bones of the head, but less prominent, so as to be concealed in the recent fish by the inte¬ guments, and the point of the principal preopercular spine not hooked. It is the type of the genus Cotopsis, Girard. Genus VIII. Triglopsis, Gir. Head smooth. Many muci- Fishes. ferous canals developed in the bones of the skull and face, as in Classifica- Acerina. First dorsal shorter and much lower than the second one, tion— and distant from it. No palatine teeth ; teeth on the chevron of the Acanthop- vomer, and also down the median line. Four preopercular spines, terous shorter and more slender than is usual in Coitus. Gill-openings connected on the throat without an isthmus. Branchiostegals six. All the pectoral rays undivided. One species, Lake Ontario. . Genus IX. Phobetor, Kroy. Cotti destitute of vomerine teeth ; resembling Coitus Scorpius in general aspect. Acute small turbinal spines. Principal preopercular spine snagged; three acute points on the bone beneath it; operculum destitute ot both the usual median rib and spine. A small spine pointing down¬ wards from the lower angle of the suboperculum, and crossed by a smaller interopercular spine. Suprascapulae unarmed. wo sma cranial tubercles on each side. No orbital ridges. Lateral line com¬ posed of cutaneous mucoducts. Fins large. . , Genus X. Icelus, Kroy. Body somewhat compressed higher than thick. Head large; destitute of scales; armed with spines on the snout, preoperculum, and nape. Teeth minute, setaceous on the jaws, vomer, and palatines. Branchiostegals six. wo or sals, separated ; ventrals of four rays under the pectorals ; rays of all the fins undivided. On each side from the nape to the caudal fin a continuous series of bony shields, running near the dorsals. Ba- teral line composed of bony tubercles. Ciliated scales on the sides and belly, few and scattered; the rest of the skin naked. Three species, /. hamatus, I. bicornis, I. uncinatus. . Genus XI. Caracanthus, Kroy. Body higher than in other genera of the family, greatly compressed, oval. Snout very short, truncated ; small slender teeth on the premaxillanes and mandi¬ ble. Branchiostegals six. Preorbitar scale bone armed ivith a spi¬ nous point anteriorly. Two low dorsal fins; short pectoral fins, with simple rays; ventrals entirely rudimentary ; two spinous anal rays, set apart from the soft portion of the fin. ISo scales, but many cutaneous papillae. One species, Ota.heite. . .. Genus XII. Podaerus, Rich., 1848. Scaleless. Lateral line of simple cutaneous mucoducts, arched abruptly oyer the pectorals. Ventrals of a spine and two soft rays; two dorsals approximate , rays of all the fins, except the caudal, unbranched ; none free ' - liform bands of subulate teeth on the jaws, vomer, and palatines, and in hemispherical tufts on the pharyngeals, also on the tuber¬ cular rakers. Tongue smooth. No armature on the preorbitar, suboperculum, or fnteroperculum, nor on the -amum or supra- scapulse. Slight unevenness of the skull concealed by the soft paHs. A narrow, thin process projects from above the corner of the nreoperculum ; and the operculum ends in a thin flexible point, but°tiwre is no pungent corner, and the „f .he conceal the second preorbitar as it crosses to the hollo preoperculum. One species has the aspect of Centropomus, another of Cottus, both are more compressed than Cottus. Iwo specie , ChGENUSSXIIL Aspidophorus, Lacgp. Phalangista, Bloch Schneid Many of the characters of Cottus, such as the depressed head simple rays, six branchiostegals, but with the body cuirassed by a series of large bony scales that extend the headJ° ^ caudal fin, forming a pyramid with many faces. No ^Genl^xIvLPlatycephalus, Bloch. Head very much de¬ pressed • spiny. Body more or less depressed ; elongated , scaly. Acute teeth on the palatines. Seven branchiostegals. A spine and five articulated rays in the ventrals, which are under the middle of the pectorals, and therefore abdominal in position and W1 each other laterally, owing to the of *he Pub.c bones Dorsals contiguous or approximated. Thirty specie . Genus XV. Opeichthys, Cuv. Head depressed, and with the operculum very spinous as in Platycephalus. Body cuirassed as in Aspidophorus. Ventrals more jugular, and having a spine / .X0v“ ThSaShhOS, Cnv. Two dorsals, the first on, lower rays thickened, bat ("^""tdSg'Ih.'cLdri.rin.; X and ph.ryngeaU in rilli- of to, but with the dorsals united, and pala- little crest. Stomach small; pancreatic c*ca five ^ Genus XVIIL BEMBRAS Cuv Head, serrate^ spines, nearly as in Blatycep a us, ^ articulated rays and the rather before the pectora s, villiform bands of teeth usual spine, and as in Scorpcena there are vim o Dorsals separated, as in Cottus. Acanthop- terous Fishes. Classifica- on the jaws, vomer, and palatines tion— Two species. Genus XIX. Scorp.en^, Linn. Resemble the Cotti in manv particulars, but are distinguished by their single dorsal Head compressed laterally, and teeth on the palatines as well as on the vomer and jaws. Head large and very spiny, enveloped generally in a spongy skin; pungent or spinous points on the side of the head and gill-cover generally on the same bones as in Cottus, and they vary in size and acuteness with the species. There are besides a spinous ridge on the second suborbitar, and crests on the top of The cranium, more or less prominent and acute. No scales on the head Seien branchiostegaJs. A scaly body. Cutaneous filaments de- pendjng from various part of the head and flanks, and simple though jointed rays in the lower part of the pectorals. Eightor more pancreatic caeca ; no air-bladder. Thirty species ^ Genus XX. Sebastes, Cuv. Percoids, except for the connec¬ tion of the suborbitar with the operculum and the simple inferior rays of the pectorals. Scorpasnce, but for the presence of scales on ptrtsn0ThniEXllia-riiS’ CheekS’ and gill'covers> or on most of these Genus XXL Pteuois, Cuv. Head compressed and stran-elv shaped cutaneous filaments on the snout. Preorbitars and pre^ b!inCUTm iimP f’v. \ery l0ng mys in the Pectorals, with the nim¬ bi ane deeply notched; long slender dorsal spines. Teeth on the jaws and front of the vomer, but none on the palatines Seven branchiostegals. Small scales on the body and various parts of the dfble’ VeT TyT°id ?>- Pores Hmbsof the man! Three Tentrals ^lth five irking soft rays in addition to the spine species. 6 a Pretty ^ °Val air-b^dder. Ten Genus XXII T^nianotus, Cuv. Body extremely compressed diElt™17 r and, UnUed t0 the Cauda1’ from whi«h thianal is stinct, yentrals under the base of’the pectorals of five soft rays and one spine. Scales very small. Cutaneous filaments on the orbit on the orb?/? °f the.®n0ut- SPinous Points on the turbinals, three on the orbit, two on the cranial crest, one on the suprascapula two on the creTi VT!' ThT®e teeth on the preoperculum, a small one on the crest of the second suborbitar. Radiating lines on the pre- orbitar, and teeth on its edge. ^ nrSTu XnXIT- !5LEPSIAS" Cuv- Allied to Scorpcena by its com- SmnTe fi6 ’ CU,rassed V the suborbitar, palatine teeth, s.mple fin-rays, short, and half free in the lower part of the pec- J? a S- fn1 cutaneous filaments on the snout and mandible; but dis¬ tinguished from that genus by the five branchiostegals and hi^h f 0r*a ,hdl1Vlded int0 three unequal lobes like that of Hemitripterus : from the latter genus its compressed head separates it. All the rays of the fins, including the caudal, unbranched. Obtuse corners on poXoTrSd.""1 a“te ,urbi“i 'i,ines' ^ Genus XXIV. Aoriopus, Cuv. One of the least armed of the famuy, and the second suborbitar does not articulate opposite the HmhTf T iPr0perCTr’ bUt t0 the UPPer Part of the ascending hmb of that bone. A long single dorsal, with strong spines ad¬ vancing on the cranium to between the orbits, with its anterior rays flanked by elevated uneven cranial crests. Mouth projecting small, furnished with scarcely perceptible teeth ; no teeth on the palate or tongue. Five branchiostegals. Pectorals low down, the membrane between the lower rays deeply notched; ventrals with a spine und five soft rays; caudal rays subdivided; rays of all the o her fins .simple. Skin scaleless, smooth, or finely tuberculated. Stomach siphonal, without a dilatation to distinguish it from the oesophagus; no pancreatic ca:ca ; air-bladder oval, occupying half the length of the abdomen. This genus and Patcecus seem to link the hclerogemdai and Gobiidce to each other. Four species. Genus XXV. Apistes, Cuv. Scorpcence, having for their dis¬ tinctive character one long spine on the preorbitar, and another on the preoperculum, which, from the mobility of these bones can be raised to a right angle with the long axis of the fish, and become angerous weapons.. Soft part of the dorsal not separated from the spinous portion, but in some species rays are detached from the front and form small separate fins. Some have a naked skin like Cottus, others are scaly like Scorpcena, and some have one or more free rays under the pectoral. Cuvier kept these various forms in one genus, merely giving the name of Minous to those which have some detached pectoral rays: subsequent ichthyologists have made genera of the groups that were indicated in the ffistoire des Poissons. swollen1! tC?nCal; /0Ur- Pancreatic C£Eca ; pretty large air-bladder, ollen at the.extremities, and somewhat depressed in the middle, ghteen species, of which three are wholly without scales. theneTfn X!XVL, Cuv- APistet with one free ray under the pectorals, and thereby allied to— ICHTHYOLOGY. I*-™11- C,I°RIDAPTYLtJS’ R5ch- (Voy. of the Sulphur, IXIU). This genus combines the characters of various Sclerogenidce ■ in union with the preorbitar spines of Apistes or Minous, it has the hollow cheeks, prominent orbits, tall, slender dorsal spines, fila- ments of the fins, three free pectoral rays, and ventrals adnate to the belly, and composed of five soft rays and a spine, all as in Pelor. It has not, however, the elongated body, depressed head, and hori- zontally protruding muzzle, nor the vomerine teeth of Pelor, and ol the Scorpcence generally ; it is distinguished from Synanceia by its free pectoral rays, but resembles that genus in general form. Skin scaleless. Many filaments on the head, mandible, and fins. One species. Genus NXVHL Sthenopus, Rich. (lib. supra cit.) Aspect of elor, with a less extraordinary-shaped, though large head, and iree ngher rays of the dorsal, advanced to the orbits, but con¬ nected at the base by membrane to the remainder of the fin Only two soft rays and a spine in the small ventrals, which are under the base oi the pectorals. No pungent points on the bones of the head ar? C °thed With S0ft’ thick> loose integuments. Skin of the body destitute of scales, but covered in many parts, especially along the lateral line, with small cutaneous filaments, b -tand alf° the head> pectorals, and dorsal. Pectorals at>- tached differently from those of Synanceia. Teeth on the jaws and chevron of the vomer; none on the palatines. The second suborbitar, w ich traverses the cheek, is a narrow plate that descends from under the eye to the curve of the preoperculum ; the preorbitar is subulate with a cartilaginous tip. One species. Genus XXIX. Pei.or, Cuv. Head as it were broken down above, with prominent orbits approximated to each other. High and almost isolated dorsal spines. No scales. Bands of fine villiform teeth on the jaws and front of the vomer; none on the palatines or tongue. Two free rays under the pectorals. The large moveable spine of the preorbitar of Apistes is absent, by which they are separated from the species of that genus with naked skins, but there are angular points on the preorbitar, and still more promi¬ nent ones on the preoperculum, operculum, suprascapula, and coracoul. Stomach caecal; four thick pancreatic c»ca; an air- bladder scarcely as big as a pea placed near the pylorus. Seven species. J GINUu XXX- SYNANCEIA, Bloch., Schneid. Destitute of spines °n .m16 u which. 18 not niore compressed than that of many otti. eeth on the jaws, but none on the vomer or palatines : no free rays under the pectoral, but the tips of some of the rays project considerably in some species. Mouth vertical as in Uranoscopus, the manmtde.bemg in front when shut; this form of the mouth, five soft rays in the ventrals, and the want of vomerine teeth, distin¬ guish the genus from Sthenopus. Skin scaleless, smooth and slippery. Eyes in some lateral, though high on the head; in S. asteroblepa very small, and on the dorsal aspect of the head. Stomach oval cascal; four thick pancreatic cmca ; air-bladder simple, small in the tore part of the abdomen. Twelve species. . Synancideum (Mull., Acad. Berl. 1839) is Svnanceia with vome¬ rine teeth. ^ S. trachynis (Rich.) is an Australian species. Genus XXXT. Aploactis, Schleg. Intermediate among the otti, Synanceia, Apistes, and Agriopi, resembling Cottus in denti- lon and in its ventrals, with two soft rays and one spine; Sqnanceia in the want of armature of the head and general physiognomy • Apistes m the compressed head and shape of the dorsal; and some griopi in its skin being studded with bristles springing from small tubercles. Two species. Genus XXXII. Monocentris, Lacep. Very different in aspect from the other members of the family, but having the distinguishing c mracter of the group in the suborbitar crossing the cheek to the preoperculum. Body thick and short, cuirassed by enormous rough angular and keeled scales. Four or five thick spines not connected with membrane form an anterior dorsal; ventrals having one enor¬ mous spine, and a few small, almost invisible rays in its axilla • Face bulging. Villiform teeth on the jaws and palatines ; none on the vomer. Eight branchiostegals. Soft dorsal and anal opposite, and far back. One species. Genus XXXHI. Trachichthys, Shaw. (Hoplostethus, Cuv. ; Vf- iTu' 1V-\47°> and iH” 2290 Form oval, to which the tail behind the anal is to be added. Face very convex; mouth termi¬ nal, descending obliquely. Eye very large. Top of the head and cheeks cellular, from the prominence of branching bony crests which on the cheeks radiate from the suborbitars. Operculum and disk of the preoperculum striated ; a spine from the angle of the latter; a small spine terminating a ridge on the upper part of the operculum ; a flat rough spine on the suprascapula, and one on the mastoid One dorsal; ventrals under the pectorals of six soft rays and a spine; the soft rays of all the fins branched. Belly ser¬ rated behind the ventrals. Caudal deeply forked. Two species. enus XXIV. Chirus, Stel. Pretty long compressed scaly fishes, with a small unarmed head. Scales ciliated. Cheek traversed 283 Classifica¬ tion— Acanthop- terous Fishes. 284 Classifica¬ tion— Acanthop- terous Fishes. ICHTHYOLOGY. by the second suborbitar, as in the other Sclerogenidce; distinguished by having several (generally five) lateral lines at various heights Mouth small. Dorsal nearly even, extending all along the back , its spinous rays slender; ventrals of five rays and a spine. No pan¬ creatic caeca. Frequently a tufted filament on the eye-brows, len ^^he ffemis Stichceus of Reinhardt (Oversigt over det Kongelige, Danske, Vid. Sels. &c., 1835-6) should come in here, but we have not at present access to Reinhardt’s paper. SCRENOIDS. Several genera have been removed from this family as it was presented in the Histoire des Poissons, particularly the groups which have a lateral line broken or inteirupted under the distal end of the dorsal fin. These form the Ctenoid Labroids in the order of Pharyngognaths already treated of. We have also associated the genera that have fewer branchiostegals than seven with the 77/eraponidee, and Cheilodactylus with the Pohjnemidee. These being removed, the remainder present a more perfect family aspect. TABLE OF GENERA. Two dorsals, or one dorsal deeply notched. No mandibular barbels. No strong canines. Denticulated preopercula. No large smooth rounded teeth. Snout convex, bulging. SCIiENA, CORVINA, LeIOSTOMUS, JOHNIUS. Snout not convex nor high and rounded. Larimus, Lepipterus Large pavement-like teeth on the jaws. Boridia, Conodon. Preopercula not denticulated. Nebris, Eleginus. Strong canine teeth. Otolithus, Ancylodon. One or more mandibular barbels. Umbrina, Lonchurus, Pogonias, Micropogon. One dorsal only. H^mulon, Pristipoma, Diagramma. sound.” Mr Yarrell mentions some subsequent instances Classifica- _ . . . . - - -r i f irm — Fig. 100. Corvina liichardsonii. Fig. 101. Air-bladder, Corvina acoupa. This woodcut represents a fresh-water Corvina, common in Lake Huron. We have, however, some suspicion of its belonging more properly to the Theraponidce than to the Scicenidce, notwithstanding Cuvier’s weighty authority. It has only six branchiostegals. Many members of this family have curious air-bladders with fringe-like appendages. The subjoined woodcuts re¬ present that of Corvina acoupa, and Ct Pogonias chromis. One of the most remarkable of the Scicence is the aquila, called Umbrina by the Romans, and held in high esteem in the Mediterranean even at the present day. It is very rare on the British coasts. Dr Patrick Neill records one instance of its capture off Ugea in Northmavine, Shet¬ land, in November 1819. When first seen, it caught the attention of the fishermen by its endeavours to elude the pursuit of a seal. It measured five feet four inches, and when lifted into the boat made its usual “ purring of its being taken on the Northumber¬ land and Kentish coasts. It is much more common in the Mediterranean, and Paul Jovius says that many were taken at the mouth of rivers in the Roman states, along with Sturgeons. They swim in troops, and are said to utter at times a low bellowing sound. On one occasion, the fishermen, guided by this sound, dropt their net with such success as to secure twenty fine fish at a single cast. The noise may be heard from the depth of twenty fathoms, and is often very perceptible when the ear is placed upon the gunwale of the boat. Its tone seems to vary, as some have compared it to a dull buzzing, others to a sharp whistle. Some fishermen allege that the males alone are musical during spawning time, and that it is quite possible to capture them without any bait, merely by imitating this pe¬ culiar sound. One alluded to by Cu¬ vier as having been entangled in a net spread along the shore at Dieppe, was at first found sleeping ; but on being handled it roused itself so suddenly, and with such violence, as to precipitate the fisher¬ man into the water, and force him to call for as¬ sistance be¬ fore he could become its master. High, though of course ima¬ ginary vir¬ tues, were formerly at¬ tributed to the stones which occur in the ear of this, as of other osseous fishes. They were worn on the neck, set in gold ; and , _ Belon says they were called colic-stones, being renowned tor the cure, and even prevention of that complaint. It was necessary, however, that they should be received as a gitt, such as were purchased being found to lose their virtue. The Pogonias grow to a great size, some of them weighing occasionally above a hundred pounds, and the singular sounds uttered by them have gained them the vulgar name o? Drums. Mr John White, an American lieutenant, who (in 1824) published^ Voyage to the China Seas, relates, that being at the mouth of the River Cambodia, himself and crew were greatly astonished by certain extra- ordinarv sounds, which were heard from around and beneath the vessel. They resembled a combination of the bass of an or-an, the sound of bells, and the guttural cries of a large frog, with certain tones which the imagination might tion- Acanthop- terous Fishes. Fig. 102. Air-bladder, Pogonias chromis. I C H ^ Classifica- attribute to a gigantic harp. It might almost have been said Acanthon that the ye^el trembled at those uncertain sounds. For terous some time they increased, and finally formed a loud and Fishes. un>versal chorus, the entire length of the vessel, and on , either side. In proportion as they ascended the river the mysterious sounds diminished, and finally altogether ceased The interpreter gave the information that they were pro¬ duced by a troop of fishes of a flattened oval form, which possess the faculty of adhering firmly to various bodies by their mouths. A similar phenomenon was noticed by the illustrious Humboldt in the South Seas, although he was unable at the time to divine the cause. It would, as Cuvier has remarked, be an object of curious research to discover by what organ these sounds are produced. Lieutenant White need not have left his own country to become acquainted with the loud noises produced by the “ Drums” or “ Grunts,” as Pogonias chromis is named in the United States. This fish, or a species similar to it in appearance and habits, abounds in the winter and spring on the coasts of Georgia and Florida, and drums so loudly on the bot¬ toms of vessels that anchor there, as utterly to deprive the sailors of sleep, until several nights’ use has accustomed them to the loud and disagreeable noise. The sound is better expressed by the word drumming than by any other, and is accompanied by a tremulous motion of the vessel’ We caught several of the fish, and found them excellent food, but their tails were rejected as being full of parasitic Jilarm. It appeared to us that the uneasiness produced by these parasites might cause the fish to beat their tails against the bottom of the vessel, and that many individuals were employed in keeping up the sound which continued without the slightest intermission all the night through. The teeth of Plectropoma dentex THYOLOGY. 285 Fig. 103. Diagramma orientale. have been shown by fig. 60. Fig. 103 repre¬ sents a Sciaenoid of the group having a single dorsal fin. This group corresponds in external appearance with the Per- coids that have a single dorsal, being seemingly as much allied to them as to the typical Sciaenoids with the two dorsals, and differing from the analogous Percoids chiefly by the presence of teeth on the loof the mouth, and a few pores on the mandible. The latter character, however, exists in some Percoids also. Family Vlir.—SCLENID^E. (Xfa Scicenoides, Cuv.) With many of the exterior characters of the Perco'ides, such as a spinous or denticulated operculum, a vari¬ ously armed preoperculum, scaly body, a simple or double dorsal, or one deeply notched, and the same varieties in the combination of these characters, they have more or less of a peculiar family physiognomy, and differ from the Percoids in having no teeth on the vomer or palatines. The bones of the head and face are often full of muciferous cells or hollows, with external porous openings ; and the face and snout are frequently gibbous. The vertical fins and parts of the head are occasionally scaly. Scales ctenoid, gene¬ rally obliquely ranged. In their internal anatomy there is more variety than in the Percoids, and their air-bladders especially have branching appendages in many genera. The diagnostic characters are, denticulations or spines on the opercular pieces; cheeks not cuirassed by the suborbitar; mouth little protractile; vomer and palatines toothless; seven branchiostegals. (a.) Two dorsals, or one deeply notched. Genus I. Sci^ina, Cuv. Head convex, with cellular bones. Two dorsals, or one dorsal deeply notched, and the soft part much longer than the spinous one ; a short anal. Preoperculum denticulated ; operculum ending in points. Seven branchiostegals. Otolites larger than in most fishes, and the air-bladders large and complicated. The proper Sciasnce have feeble spines in the anal, and are destitute of canines and barbels. Stomach caecal; ten pancreatic caica or more. Four species. Genus II. Otolithus, Cuv. Scicence also with feeble anal spines p.no and no barbels, but having long curved teeth or canines among the . nca‘ others. Air-bladder having a horn-like projection on each side in front; four pancreatic casca. Fiahteen sr.Pf.Ioa Acanthop- front; four pancreatic casca. Eighteen species. Genus III. Ancylodon, Cuv. Otolithes with a very short snout excessively long canines, and a pointed tail. Two species. Genus IV. Corvina, Cuv. Scicence with wholly villiform teeth and no barbels, but differing from Scicena and Otolithus in the gi eat size of the second anal spine. Nineteen species. Genus \r. Johnius, Bloch. Considered by Cuvier to be like orvina and Otolithus, a subdivision of Scicena, and distinguished chiefly by the second anal spine being weak and shorter than the sort rays of that fin. Eighteen species. Genus VI. Leiostomus, Cuv. Johnii in having a small anal spine or feeble denticulations in the preoperculum; but the teeth of the jaws so fine as to be with great difficulty seen; pharyngeal teeth pavement-hke. Scales ciliated. Horns of the air-bladder smaller and more slender than in Otolithus. Two species. Genus VII. Larimus, Cuv. One of several anomalous Sciaenoid torms, which have characters different from those of the foret;ointr groups. Two dorsals. Villiform teeth. Forehead not arched ; snout short; preoperculum slightly denticulated. Stomach caecal, narrow- eleven pancreatic caeca; air-bladder large, simple. Two species. ’ Genus VIII. Kerris, Cuv. Sciaenoids with two dorsals. Villi¬ form teeth Profile nearly straight; snout short; mandible ascend¬ ing Limb of the preoperculum membranous, and merely striated and the fins all more or less scaly. One species. Genus IX. Lepipterus, Cuv. Sciamoids with villiform teeth prolonged snout, profile rather concave, and very scaly vertical fins. One species. J Genus X. Boridia. Cuv. Corvince with smooth blunt teeth on the jaws. One species. Genus XI. Conodon, Cuv. Sciasnoids distinguished from the others by having a row of conical teeth on the two jaws. One species. Genus XII. Eleginus, Cuv. Sciaenoids with an entire pre¬ operculum, Mouth small. Anal long. Two short conical horns in the fore part of the air-bladder. Three species. . Genus XIII. Eques, Bloch. Resemble Scicena, Corvina, Johnius in their convex snout, scaly throughout, like the rest of the* head; in the mucous pores and pits of the lower jaw; in the up¬ per jaw being able to retire under the edge of the preorbitar; in the length of the second dorsal, and the shortness of the anal* both of them scaly as well as much of the caudal. Teeth villiform’ and not elongated like those of the Chcetodons. In Eques the body is compressed, and by the convexity of the nape assumes a cunei¬ form outline. Branchiostegals seven. Faint crenatures on the pre¬ operculum; the bony frame of the operculum ends in two flat points. rlhe first dorsal is high and peaked with mostly flexible rays; second dorsal low and long; caudal rhomboidal ; ventrals longer than the pectorals. A small membrane in front of the snout, with a pit on each side between it and the high preorbitar. A small pore beneath the mandible on each side of the median line. A large silvery air- bladder; cascal stomach; four pancreatic caeca. Three species. Genus XIV. Umbrina, Cuv. Sciaenoids having one barbel un¬ der the mandibular symphysis. Thirteen species. Genus XV. Lonchurus, Cuv., Bloch. Umbrince with two mandibular barbels and a pointed caudal. Two species. Genus XVI. Pogonias, Lacep. Umbrince with many small man¬ dibular barbels. Lower pharyngeal teeth and middle upper ones large like those of Labrus. Two species. Genus XVII. Micropogon, Lacep. Sciaenoids with a prominent nape like Corvina. Moderate-sized anal spine, and very small and numerous barbels. Distinct denticulations on the ascending limb of the preoperculum, those at the angle being larger; operculum end¬ ing in two flat points. Membrane at the end of the snout four-lobed. Mouth moderately protractile; pretty broad bands of villiform teeth; pharyngeal teeth villiform, the middle ones being larger, with obtuse summits. Under the mandible at the symphyses two large pores and three small ones; three or four little barbels attached to the limb of the mandible. Scales slightly rough and oblique as in the Sciaenoids in general. Dorsal spines not very strong; slender ventral spine, and the anal spine shorter than the soft rays ; caudal nearly even at the end. Three species, America. (b.) A single dorsal; preoperculum always denticulated. Genus XVIII. Hasmulon, Cuv. Body oblong, pretty high an- teriorly, somewhat compressed. Profile descending almost in a straight line, and forming a snout that projects tolerably. Preor¬ bitar large, but not denticulated, covered with skin and scales, joining the cheek as in the Scicence in general, and forming a ledge under which the moderately protractile upper jaw retires. Lips fleshy. Mandible articulated under the eye, having an oval pit 286 ICHTHYOLOGY. Classifies- under the symphysis, and two small pores m advance of it. V Ui- \-on_ form teeth In the jaws, with some bigger than the rest - the outer \canthon- row (but much less so than in Dentes, which, moreover, has an en- terous1 tire preoperculum). Operculum ending in two flat obtuse angular Fishes projections, which do not show through the membrane; and the gill- , cover is sometimes quite rounded. Palate without teeth ; tongue smooth and free. Seven branchiostegals, the last three slender, r o denticulations on the suprascapula. A triangular scaly appendage in the axilla of the ventrals; dorsal moderately notched; caudal forked and covered with small scales like those on the soft parts ot the dorsal and anal. Scales of the body large, finely ctenoid; none on the lips or snout before the eyes. Stomach caecal, small, and pointed ; seven pancreatic caeca ; a long simple air-bladder. Four- teeGE8NUS1XIX. Prxstipoma, Cuv. Resembling Haimulon in most characters, and in the mandibular pores, but having a more bulging snout smaller mouth, less moveable mandible, and no scales on the dorsal or anal. Operculum ending in a smooth point, hidden under the skin. Villiform teeth, with the exterior row generally stronger. (Distinguished from Diagramma by the latter having four or six large pores on the mandible, and from Lobotes by the presence of mandibular pores and of seven branchiostegals.) Forty species. Genus XX. Diagramma, Cuv. Wants the symphysial pit on the mandible, which exists in Fristipoma, but has the two small pores, and in addition, two large pores on each limb of the bone. Fins as in Fristipoma, together with the denticulated preoperculum, and the operculum destitute of a spine. Twenty-two species. Genus XXL Prionodus, Jenyns. Aspect of Serranus, but without the palatine and vomerine teeth. It enters the group of Hcemulon, Pristipoma, and Diagramma, from all of which it is dis¬ tinguished by the want of pores under the mandibular symphysis. Genus XXII. Pristipomoides, Bleek. Single, undivided, dorsal fin. Branchiostegals seven. Dorsal and anal without scales ; caudal scaly. No conspicuous mandibular pores. Lateral jaw teeth uniserial; anterior ones pluriserial; the internal ones minute and setaceous; the external row formed of two to four larger conical canines. Preoperculum denticulated. Sumatra. Genus XXHL Cheilotrema, Tschudi. Upper lip protractile, with eight pores. Mandible with five pores. Operculum toothed; preoperculum having two spines. Peru. SPAROIDS. The Histoire des Poissons contains the following table of the genera :— TABLE OF GENERA. Teeth in part conical or molar. Checks scfily* Sargus, Charax, Chrysophrys, Pagrus, Pagellus, Dentex, Pentapus. Cheeks scaleless. Lethrinus. Teeth wholly villiform. Cantharus. Trenchant teeth, no molars. Box, Oblata, Scatharus, Crenidens. By their dentition they may be arranged in tribes in the follow- ing order :— Tribe I. — Round molars and trenchant front teeth, Sargus, Charax, Chrysophrys, Pagrus, Pagellus. Tribe II.— Conical teeth with canines. Lethrinus, Dentex, Pentapus. Tribe III.— Teeth all villiform. Cantharus. Tribe IV.—Trenchant jaw teeth, with or without villiform bands. Box, Oblata. The Sargi in general feed on shells and the smaller Crustacea, which they easily crush with their molar teeth, but Cuvier found fuci in the stomachs of some brought from the Red Sea and the Atlantic. iElian and Oppian inform us that the male is polygamous, and fights with great fury with his own sex for the possession of many females. The same authors attribute to it a feeling still more extra¬ ordinary,—a lively passion for goats, which it exhibits by always swimming with great rapidity towards those animals, and indulging in playful gambols before them. So blind was this passion, that a fisherman (it was so alleged) might catch as many as he pleased by disguising himself with the Llassifica- skin and horns of a goat, and scattering in the water flour steeped in goats’ broth. terous The best-known species inhabits the Mediterranean, it j’isiies< is the S. Rondeletii of Cuv. The American shores pro- duce several others, one of which (*S'. ovis) is called the Sheep’s-head by the Americans. Dr Mitchell speaks in the most eulogistic terms of the superexcellence of its flesh, and of the high esteem in which it is held at the tables of J. ew York. It yields in his opinion to few fishes, and is worthy of being served at the most sumptuous entertainments. The price varies from a dollar to a dollar and a halt for a middle-sized individual, and above that size the pi ice langes even so high as from L.4 to L.7 sterling. I hey sometimes weigh from 14 to 15 lbs. The fishery of this species forms an object of importance along the coasts of the state o New York. It approaches those of Long Island in the hot season from the month of June till the middle of Septem¬ ber, after which it seems to seek retirement in the deep abysses of the ocean. As they swim in troops, they may be advantageously fished for with the net, and many hun¬ dreds are sometimes taken at a single cast. M ith the great nets used at Rayner Town, and the two islands, thousands are drawn ashore. They are immediately packed in ice, and despatched during the cool ot the night to the markets of New York. It is difficult to take the Sheep’s-head with a line, because it contrives to snap the very hooks asunder with its cutting teeth. The species of Chrysophris are numerous, and extended through many seas. Those of the Mediterranean are on y two in number, and are cnWeti Daurades by the French, no doubt from the Latin Aurata, a term applied to them by ancient authors. The Greeks named them Chrysophris, which signifies golden eye-brow, in allusion to the brilliant spot of gold which the common species bears between its eyes. That the Aurata of the Latins was identical with the Chrysophris of the Greeks, may be inferred from a passage in Pliny, which is obviously borrowed from Aris¬ totle, and where the former word is used as the translation of the latter. According to Columella, the Aurata was among the number of the fishes brought up by the Romans in their vivaria; and the inventor of these vivaria, one ber- gius Grata, is supposed to have derived his surname from the fish in question. Adi an tells us that the Chrysophris is the most timid of all fishes, and that branches of poplars p anted in the sand so terrified a party of these fishes which had been carried upwards by the flood, that in the succeeding reflux they did not dare to pass the poplars, but allowed themselves to be taken by the hand. The Chrysophris aurata, or Cilt- head, seldom quits the vicinity of the shore, and grows ex¬ tremely fat in the salt ponds. We owe to Duhamel what¬ ever information we possess regarding its habits. 1 he tish- ermen informed that author that it agitates the sand forcibly with its tail, so as to discover the shell-fish which may he beneath concealed. It is extremely fond of mussels, and its near presence is sometimes ascertained by the noise winch Fig. 104. Crenidens tephrceops. it makes while breaking their shells with its teeth. It greatly ICHTHYOLOGY. 287 Classifica- dreads cold, and many were observed to perish daring the tion— severe winter of 1 766. The Gilt-head is a British species, Acanthop- but Gf extremely rare occurrence. i-n-Y*r\ no * * f he Dentex vulgaris, a fish of a silvery hue, shaded into blue upon the back, with reddish pectoral fins, and some¬ times attaining to the weight of 20 lbs., has occurred upon the Sussex coast. The specimen figured by Donovan (pi. 73) was obtained in Billingsgate market. Fig. 31 represents a scale of Lethrinus cynocheilus, and may give some idea of the general character of a Sparoid scale, alluded to in the table of genera at the bottom of the page. Family IX.—SPARID^). Sparoid scales; a large elongated scale in the axilla of the pec¬ toral. Gill-cover shining, without proper spines or denticulations. Maxilla capable of being received in part under the preorbitar scale bone, which is generally high. Spinous rays of the dorsal and anal fins bare, mostly lodging in a furrow ; pectoral and ventral fins sharp pointed; caudal fin notched in an angle at the end. The Sparoid scales are generally thin, broader than long, and the centre of growth is near the posterior border, the lines being parallel to the anterior border, and becoming straight laterally. Their pecu¬ liar structure is described more fully in Agass. Poiss. Foss, i., p. 86, and in Troschel s Arch, for 1849, p. 382. Snout not projecting nor protractile, destitute of palatine teeth, and distinguished from the feciaenoids by the want of any denticulations or armature of the gill-covers, and of cavernous or cellular structure in the cranium ; from the Chcetodontidai, by the want of scales on the vertical fins ; and by the size and nature of the scales from the Scomberidce (Hist, des Poissons). Branchiostegals generally six, sometimes five, rarely seven. and head wholly unarmed. Yentrals consisting of a spine and five Classifica- soft rays under the pectorals. Scales ctenoid, in some covering all tion the head except the disk of the preoperculum, mandible, and lips, Acanthop- in other species have more or most of the opercular pieces scaleless; terous narrow vertical bands of scales exist on the fins in some species, Fishes, but are easily deciduous. Teeth compressed, curved, crenated with i ^ — j three or more disks, rarely entire, forming two rows on the jaws, and separated by a furrow from an interior band of minute teeth appearing to be granular, but when examined with a lens showing the same forms with the exterior older ones which they are des¬ tined to succeed. Vomer and palate generally toothless. In C. simplex, a species with entire incisorial teeth, the vomer is furnished with a patch of minute teeth invisible to the naked eye, and there is a similar plate on the front of the palatines. Pharyngeal teeth small, short, subulate, and densely crowded. Branchiostegals six. Six species. MA3NOIDS. This family is distinguished from the Sparoids by the protractility of the mouth, and by a greater thickness of the face and of the body generally. The Mediterranean species were known to the ancients, and their Greek name is La¬ tinized by Pliny to Mce?ta, and adopted by Cuvier as a generic term. They are mostly small fishes, despised by the ancients, and held in no great esteem now. “ Fuisse gerres aut inutiles maenas, Odor impudicus urcei fatebatur.” Martial. The following table of the genera is from the Histoire des Poissons, the source from which our observations gene¬ rally are drawn:— (a.) Round molar teeth, with trenchant or conical front ones. Genus I. Sargus, Cuv. Several rows of molars; incisorial front teeth. Cheek scaly. Sixteen species. Genus II. Charax, Itisso. One row of very small molars al¬ most granular; incisorial front teeth. Cheek scaly. Genus III. Chrysophrys, Cuv. Several rows of rounded molars ; front teeth conical. Cheek scaly. Twenty-four species. Genus IV. Pagrus, Cuv. Hounded molars in two rows; front teeth conical, with a villiform card-like band behind them. Cheek scaly. Fifteen species. Genus V. Pagellus, Cuv. Two or more rows of rounded molars; front teeth villiform. Cheek scaly. Twelve species. (6.) Teeth conical, with larger ones, or canines. Genus VI. Lethrinus, Cuv. Teeth villiform, mixed with long curved ones, and occasionally one or two rounded molars. Cheek naked (without scales). Twenty-eight species. Genus VII. Dentex, Cuv. At least four large canines among villiform or card-like teeth. Cheek scaly. Thirty species. Genus VIII. Pentapus, Cuv. Cheek scaly. “Teeth villiform, with only two canines ; mouth small. Caudal more scaly than in Dentex. Eight species. (c.) Teeth all villiform. Genus IX. Cantharus, Cuv. Villiform teeth, the exterior ones stronger. Twelve species. (d.) Trenchant teeth without molars, sometimes accompanied by villiform bands, sometimes without them; no rounded molars. Genus X. Box, Cuv. A single row of thin vertical teeth notched or crenated on the edge. Six species. Genus XL Oblata, Cuv. Crenated cutting teeth as in Box, with a villiform band behind them. Two species. Genus XII. Boxaodon, Guich. Body elongated, roundish, covered with small scales. Snout short; mouth small, not protrac¬ tile. Xo teeth whatever. Opercular bones not denticulated nor serrated. Eyes large. Dorsals two, with many free spines between them ; ventral fins minute, situated on the thorax. Branchial open¬ ings wide ; branchiostegals six. Valparaiso. Genus XIII. Scatharus, Cuv. Cutting teeth not crenated in a single row. One species. Genus XIV. Crenidens, Cuv. (Girella, Gray; Melanichthys, Schleg. Fauna Jap.) Oval scaly fishes, with a nearly even dorsal having many spinous rays. Convex profile; terminal small mouth TABLE OF GENERA. M^NiDES. Form sparoid, but having occasionally teeth on the palate, or denticulations on the preoperculum. Mouth in all cases very protractile. No scales on the dorsal jin. MjENA, Smaris. Scaly dorsal. CiEsio, Gerres. The other genera are characterized by ichthyologists who have written subsequently to the publication of the volume of the Histoire des Poissons, which contains the Meetiidce. The genus Emmelichthys is one of those which combines Fig. 105. Emmelichthys nitidus Scale of Emmelichthys nitidus. the chaiacters of several groups. It has much affinity to 288 Classifica¬ tion— Acanthop- terous Fishes. ICHTHYOLOGY. Ccesio, but differs in having seven brancluostegals a deeply and widely notched dorsal, approaching more nearly to two dorsals than Gerres, scaly sheaths to the vertica fins of a different character from the scales that invest the fins in these two genera; and the snout, gill-covers, and maxil- laries more strongly and more completely scaly. It is not without a resemblance to several of the genera assembled under the head of Theraponidce. To Glaucosoma it ap¬ proaches in the extent of scaliness of the head and fins, but differs greatly in aspect, dentition, branchiostegals, and especially in its protractile mouth. From the typical Per- caidce, with which it agrees in having seven gill rays, it is kept distinct by its unarmed head; the want of mandi¬ bular pores will not allow it to associate with Heemulon, Pris- tivoma, or Diagramma ; and it bears little resemblance in its sparoid scales to the oblique-scaled typical Scieznidee, from which also its elongated face distinguishes it. The want of teeth is a character which it has in common with Boxaodon and Macquaria, but the latter has only five bran¬ chiostegals. It is a genus recently discovered in the Japa¬ nese and Australian seas. Fig. 18 shows the protractile mouth of Emmelichthys nitidus, with the scales on the maxilla ; Fig. 105 gives a figure of the entiie fish, and Fig. 106 represents one of the scales. Concerning the Pseudochuomid,e we have almost no¬ thing to say. The genera are not described in the Histoire des Poissons, and but little is contained in the Begne Ani¬ mal concerning them. Indeed, a brief notice of the names of the genera composing the family given in the Archiven fur Naturgeschichte, is our only authority for introducing it here. In the Begne Animal, Plesiops and ( icldops were placed among the Labroids, but M. Valenciennes states, in 1839, that having studied at Leyden the fish sent from Java, by Kuhl and Van Hasselt, be was convinced that the Plesiops and Cirrhipteri of these naturalists could not re¬ main in the Labroid family. Willughby had already no¬ ticed the existence of two small pancreatic caeca in Chromis (Sparus chromis, Linn.) ; and M. Valenciennes finds it to agree so nearly with Pleswps, as not to be generically dis¬ tinct. Their teeth, the interrupted lateral line, constitution of their scales, and the filaments of the spinous dorsal rays are alike in both. Cuvier, in stating that the Chromidts had no pancreatic caeca, had in view the Bolti or Labrus niloticus, which, in fact, wants these organs. In conclu¬ sion, M. Valenciennes is inclined to place the genera in question with the Glgphysodons and their allies. Miiller, finding a coalesced pharyngeal in Chromis, has introduced it as the type of a family among the Pharyngognaihi, ic- ferring the Pseudochromidce to the Acanthopteri. large, deciduous. Veutrals under the anterior third of the pectorals. Classifica- Twenty species. tion— Genus V. Emmeuichthys, Rich. (Erythrichthys, Schleg.) Acanthop- Form of the body that of Smarts or Ccesio. Dorsal more deeply terous notched than that of Gerres, the last two or three spinous rays being Fishes, almost detached. Very slender setaceous pharyngeal teeth ; none y t_ ^ ^ > on the mouth. Jaws moderately protractile directly forwards. Head and body, and bases of the vertical fins, scaly. Scales ctenoid. No spines on the head. Preoperculum and suboperculum very minutely crenulated. Suprascapula irregularly dentate. Branchiostegals seven. Two species. Genus VI. Ditrema, Schleg. Jaw teeth minute, pluriserial, with a few conical ones in front; no vomerine or palatine teeth. Snout a horizontal protractile tube. Opercular pieces and suborbi- tar scale bones not denticulated. Dorsal single, low ; anal and genital apertures apart; anal fin having three spines and numerous simple rays. Branchiostegals six. Genus VII. Dipterygonotus, Bleek. No teeth on the maxil- laries, vomer, or palatines. Opercular bones not denticulated, there being a single flat spine on the operculum only. A horizontally pro¬ tractile tubular mouth. Dorsal fins two, remote, not scaly. Cheeks scaly. Branchiostegals seven. Macassar. Genus VIII. Apogenoides, Bleek. Setaceous maxillary teeth; no teeth on the vomer or palatines. Opercular bones not toothed ; no opercular spine. Mouth little protractile. Dorsal two, remote, not scaly. Branchiostegals six. Macassar. Genus IX. Mendosoma, Guich. Body oblong,compressed, scaly, with the aspect of Mcena. Head small ; mouth protractile, with a very small opening; many conical teeth near the premaxillary symphysis only, none on the mandible or vomer. Dorsals two, con¬ tiguous, or one fin notched to its base. Ventrals thoracic, destitute of the long acute scales. Branchiostegals six. Valparaiso. Genus X. Pentaprion, Bleek. Dorsal solitary. Mouth pro¬ tractile downwards; teeth on the jaws only. Spinous anal rays five. Branchiostegals six. Batavia. Genus XI. Velifer, Schleg. Near Ccesio and Gerres. Body very high and compressed. Dorsal and anal fins excessively large, and supported by soft, thick, unjointed rays. Japan. Genus XII. Acharnes, Mull, and Trosch. Distinguished among the Menidce by the interrupted lateral line. Teeth on the jaws card-like ; no palatine teeth. Protrusive mouth. Five branchioste¬ gals. Dorsal deeply notched ; dissevered pharyngeals. No arma¬ ture on the gill-cover or properculum ; no accessory gills. Genus XIII. Aphareus, Cuv. A genus of uncertain affinities, and placed by the authors of the Histoire des Poissons, after the Menidce, merely because no more fitting position occurred to them. They were acquainted only with a dried specimen which seemed to have some resemblance to Ccesio, but differed from it in having an obtuse gill-cover and large mouth with an elevated ray at the ends of the dorsal and anal fins. A very narrow band of villiform teeth on the jaws. Palate smooth, but the vomer projecting and produc¬ ing two rounded eminences. No scales on the forehead, the lips, or jaws; but the cheeks, gill-cover, and top of the head scaly. Seven branchiostegals. Suprascapula denticulated. Ventrals attached a little behind the base of the pectorals. One species. Genus XIV. Ch^TOPTERUS. Schleg. Comes nigh to Aphareus in habit, but is furnished with vomerine teeth, and possesses four branchiostegals. Family X.—MENTDiE. Les Menides, Cuv. Distinguished from the Sparidat, which they resemble, by the protractility of the mouth. Villiform teeth on the jaws more or less short. Premaxillary pedicels long, admitting of the body of the bone being thrust out horizontally when the man¬ dible is long in proportion, but when that bone is abbreviated then downwards. Some genera want teeth on the palate, others ha>e small ones on the vomer. Body scaly. Ventrals situated under the pectorals ; dorsal furnished with very fine scales. Stomach of mo¬ derate size ; pancreatic caeca varying from four to seven ; air-blad¬ der large, simple, and rounded anteriorly, divided for the most part into two pointed lobes posteriorly. Genus I. M.ena. Cuv. Aspect of a Sparoid, but occasionally having teeth on the palate, and a denticulated preoperculum. Mouth invariably very protractile. Four species. Genus II. Smaris, Cuv. No scales on the dorsal. Palate tooth¬ less. General form of Mcena. Ten species. Genus III. C^sio, Cuv. Mouth but little protractile. Dorsal far back, and in a great part covered with scales. General shape inclining to fusiform. Twelve species. Genus IV. Gerres, Cuv. Mouth very protractile, descending when thrust out. Dorsal capable of being concealed in a basal scaly sheath. Small villiform teeth on the jaws, none on the palate. Pre¬ operculum finely denticulated. Body compressed, elevated. Scales Family XI.—PSEUDOCHROMID^E, Mull, and Trosch. Scaly fishes. Dorsal fin long. Jaw and palatine teeth ; no ar¬ mature of the opercular bones; interrupted lateral line ; double under pharyngeals and hackle-formed pharyngeal teeth. Six bran¬ chiostegals ; pectinated accessory gills. _ Genus I. Cichlops. Miill.and Trosch. Generic characters of Pseudochromis, only the card-like (or hackle-formed) teeth of the palatines are wanting; there is a row of vomerine teeth. The sto¬ mach is csecal, the caecal part short; pancreatic caeca absent; swim- bladder simple. Genus II. Plesiofs, Cuv. Aspect of Chromis. Eyes approxi¬ mated. Ventrals very long. Genus III. Pseudochromis. Riipp. LABYRINTHIBRANCHS. The peculiar structure of the pharyngeals in this family, by which a quantity of water can be retained in their com¬ plicated folds, is compared by Cuvier to the leaflets of a camel’s paunch. The apparatus is covered by convex gill* covers that fit closely to the shoulders; so that even when the fish is out of the water the inclosed liquid cannot eva- I C II T H Y Classifica- porate quickly, but remains falling drop by drop on the tion— branchice, and keeping them sufficiently moist to carry on A