Silliman, Prof. B. Suggestions Relative to the Philosophy of Geologyand Theory of this Science with Sacred History. New Haven, 1839 SW..- fto (Sl3 833s Z^ETVER^J YALE UNIVERSITY LIBRARY This book was digitized by Microsoft Corporation in cooperation with Yale University Library, 2008. You may not reproduce this digitized copy ofthe book for any purpose other than for scholarship, research, educational, or, in limited quantity, personal use. You may not distribute or provide access to this digitized copy (or modified or partial versions of it) for commercial purposes. SU G G *fs T I O N S RELATIVE TO THE PHILOSOPHY OF GEOLOGY, AS DEDUCED FROM THE FACTS AND TO THE CONSISTENCY OF BOTH THE FACTS AND THEORY OF THIS SCIENCE WITH SACRED HISTORY BY PROF. B. SILLIMAN. NEW HAVEN: PRINTED BY B. L. HAMLSN. 1839. APPENDIX THIRD AMERICAN FROM THE FIFTH ENGLISH EDITION OF BAKEWELL'S GEOLOGY. SUGGESTIONS RELATIVE TO THE PHILOSOPHY OF GEOLOGY AS DEDUCED FROM THE FACTS AND TO THE CONSISTENCY OF BOTH THE FACTS AND THEORY OF THIS SCIENCE WITH SACRED HISTORY. INTRODUCTORY REMARKS. My acquaintance with the Geology of Mr. Bake well com menced with the first edition, published in 1815. Being strongly impressed by its perspicuity, attractiveness, and sound philosophy, I made it the companion of my lectures on this science, and in 1829, an American edition, from the third Eng lish, was published at New Haven, under my supervision, and with the author's privity and approbation. The work met so favorable a reception in this country, that a second American edi tion, from the author's fourth, also with his approval, was edited by me in 1833, and thus it became generally known in the United States, as a book of standard authority. It appears, that the republications in this country produced so favorable an influence at home, that, from being less generally known there, than its great merits deserved, this work soon made its way into several, of the first British universities ; and we infer, from the appearance of a fifth edition, that it continues to main- 2 tain its ground with other excellent treatises on geology, which have appeared long since this was first published.* It is in accordance with Mr. Bakewell's wishes, that I now pass a third American edition to my countrymen, not doubting that I am doing to them and to all our students of geology an acceptable service. In relation to the present edition, I have revised the discourses which were appended to the two former American editions of 1829 and 1833. They have been greatly condensed, and to some extent written anew, with the intention of bringing them up to the present state of the science. The outline of my lectures, annexed to the first American edi tion of 1829, does not present a correct view of the courses which I now give. Fifteen years have elapsed since that outline was first sketched, and ten since it was published. Within those periods geology has made great advances, particularly in the proofs of igneous action, in all ages, ancient and modern ; and perhaps my own admissions of its agency were not commensu rate with the proofs that existed in 1833. The powerful direc tion early given to my mind, towards the Wernerian theory, by the captivating eloquence of the late Dr. John Murray of Edin burgh, whose lectures on geology as well as chemistry I attended, was not, at that time, fully appreciated by myself. I was also a deeply interested listener to the lectures of Dr. Hope,f based on the Huttonian theory, and I was a careful student of Playfair's splendid illustrations of that theory ; while Playfair himself, with many other eminent men of that school of geology, as well as of its rival,! was then in full vigor and activity at Edin burgh. It was delightful to listen to their eloquent statements and acute reasonings. In this way I heard both sides of the question fully vindicated, while, from my youth and inexperience, I endeavored to sustain a neutral position, and reserved the lib erty to decide ultimately, with an unbiased mind. Still I was, to a degree, incredulous in regard to the fundamental postulates of * We are informed that it has been translated and published in Germany. t The distinguished Professor of Chemistry, &c. in the University of Edinb. t Professor Jameson, then recently returned from Germany, where he had studied under Werner, had not at that time entered on his public duties. the Huttonian geologists, and could not perceive that they made out their case, as to the extent and energy of internal fire. The powerful arguments in favor of great igneous action, contained in Mr. Bakewell's Geology, were supported by Dr. Daubeny's fine Treatise on Volcanoes, and this by the full and exact work of Mr. Scrope on the same subject, with particular reference to the extinct volcanoes of France, illustrated also by an ample atlas of volcanic regions. The more recent exhibition of proofs by Mr. Lyell, as to the extent, persistence, and energy of igneous action ; the satisfac tory evidence accumulating every year respecting the increasing in ternal heat as we descend into the earth ; the decisive influence of galvanic power in mineral veins, as ascertained by Mr. Fox, its effi ciency in producing mineral crystallization and its power even in rousing into life the long latent eggs and germs of insects, as estab lished by Mr. Crosse — with the splendid proofs which our gal vanic and electro-magnetic machines now afford of an igneous energy inherent in the earth — an energy which knows no limits — attended also by magnetic and decomposing power, equivalent to all which geology demands ; these and many other considera tions that might be stated, have removed my doubts, and I have been for a series of years in a condition to do full justice to the internal agency of fire, as my various classes in the university and elsewhere can attest. It is of little importance to occupy the reader's attention, even for a moment, with my own personal views and opinions, nor would I have ventured to do so, were it not of some importance that the science may not suffer by any apparent, although not real, caprice of opinion in those who teach it to others. I have there fore thought it but honest to make, this frank declaration, my amende honorable, of the change in my views, and of the grounds of it ; and perhaps it may not be entirely without utility, as an exhibition of tha effect of progressive development and accumu lation of evidence upon one mind, inasmuch as other minds may, by similar means, be led to the same result. If, however, I still sustain the claims of water and of all things which, by the aid of heat and pressure, water is able to dissolve — to more efficiency than is now generally conceded to them — it is I trust not so much because I am still tenacious of early impressions, as because the state of experimental science, both mechanical and chemical, fully bears us out, in attributing powerful solvent properties to water, aided especially by heat and pressure and many active chemical agents. The remarks on the consistency of the fact^ and theory of ge ology with the scripture history, although superfluous with respect to learned geologists, and even learned theologians, who have studied and understood both sides of the question, appear to me to be still demanded by the state of moral feeling, and by the im perfect comprehension of geological truths on the part of the ma jority even of our educated people. I have therefore retained a condensed view of this question, which was discussed in connex ion with the edition of 1833. I. General Object of Geology. — The object of this science is to ascertain the structure of the earth ; the nature of its mine ral aggregates ; their disposition and arrangement, forming rocks and mountains ; the relative position and nature of the rocks them selves, with their included minerals and organic remains; the useful substances which they contain ; the natural associations of these with other substances ; the proximate causes, which have given the mineral masses their present form and position ; and those, which, operating upon them still, are causing them to un dergo alterations, more or less considerable, and are producing changes, which will ultimately give them new forms of exist ence. II. Positive and Speculative Geology. — It is obvious, there fore, that geology is erected upon observation, and not upon mere speculation ; yet, speculation is with propriety admitted, as an important means of advancing the science ; but it is of no value if not founded upon facts, and they must never be contradicted by it. Positive is therefore the parent of speculative geology, and it proceeds, like the other natural sciences, upon a careful examina tion of particulars ; from particular it ascends to general conclu sions, and upon these builds legitimate theory. Thus, there is a clear distinction between geological theory and geological hy pothesis. The former draws conclusions directly from facts, and follows strictly the inductive course. It has therefore the same foundation, as general physics ; and its conclusions often approxi mate to demonstration. The latter also appeals to facts, but in a manner less conclusive, and it sometimes makes suppositions of facts, not actually proved to exist. III. Former and present State of Geological Knowledge in this Country. — Before the American revolution, geology as a science, had no existence in this country, and indeed there was hardly any thing in Europe that deserved the name. In Mr. Lyell's Principles of Geology, there is an interesting historical sketch of the rise and progress of geological research and opinion, from the ages of Grecian, Arabian, and Roman philoso phy to that of the revival of letters in Europe ; and from that period, through several centuries to our own time. Vigorous minds have indeed appeared in various and remote periods, which have formed just conceptions of some parts of geology, but it could not be said to have taken the form of a science until the Wernerian and Huttonian schools began their friendly conflicts, about 60 or 70 years ago. In this country, considerable attention was early bestowed upon the research for metals and other valuable minerals, as is evinced by numerous excavations in our hills and mountains, whose date is generally in the first half of the late century. Several of the men are still living who led the way in introducing scientific ge ology among us. William Maclure* was the man who, from extensive personal examination, made the first geological sketch of the United States, after having visited geologically, most of the countries of Europe ; he has also given us much interesting geological information respecting the West Indies, Spain, and other countries. He and others, his juniors in years and in the date of their knowledge, can well remember, when the names of the most common minerals and rocks were scarcely known in the United States. Now, there are geological cabinets and schools in many places, and many geological surveys have been made, or are in progress, under public authority. We have nu merous good reports on states and territories, and many valuable * Who now, at an advanced age, resides in the city of Mexico — a country which he finds congenial to his health. 2 memoirs on particular districts ; they are to be found also in sci entific journals, in books of travels, especially of the exploring expeditions sent out by the American government ; in the trans actions of learned societies ; in detached publications, and some times even in the newspapers. These materials are of great value ; but much more must be done before they will be sufficiently co pious to enable some master spirit to reduce the whole subject to order, and thus to give a full and digested account of American geology. Foreign geologists will do us the justice to remember, that our field is vast, while our laborers, although every year in creasing in number, are still comparatively few, and they are, generally, men occupied by other pursuits ; this country is rarely explored by those whom fortune leaves at ease to follow a favorite object. The learned leisure of Europe, and especially of Eng land, is here almost unknown, and our most efficient cultivators of science are also laborers in other fields. But the habit of making efforts by systematic industry, is often an equivalent for leisure. Many of our geologists labor with zeal and effect, and in the scien tific corps, now surveying several of our states, we have men who are able to maintain their standing with those of any country. IV. Limits of our Knowledge of the Earth. — It is only the crust, the superficial part of our earth, that we can examine ; a few miles or leagues in depth of its outer rind. We no longer attempt, by a brilliant excursion of the imagination, to account for its present form ; poetry and fiction have ceased to perform the work of philosophy ; those obsolete hypotheses, falsely called theories — many of them adorned by the eloquence of powerful minds — which substituted waking dreams for the patient exami nation of facts, are no longer regarded, except as monuments of the restless activity of the human mind ; which is inclined to re pose on almost any conjecture, however visionary, rather than to confess its weakness and ignorance.* In Europe, and we are now happy to say in America also, a great number of highly qualified men are occupied in geolo- * The geological student may find a spirited outline ofthe most prominent geolo gical hypotheses in Cuvier's Introduction to Geology ; they may be read as a mat ter of amusement; but it will be easily perceived, that they bear no closer analogy to modern geology, than the visions of Alchemy sustain to modern chemistry. gical researches ; collectively they bring to the investigation, all requisite science and the habit of careful observation and induction, with the industry and patience, which are demanded. The pro gress made in these inquiries, even since the commencement of this century, is wonderful. Districts, provinces, and countries are surveyed ; and this kind of research, favored by the propensity for travelling, to which it affords both a strong incitement and a high gratification and reward, will, doubtless, continue to be extended, until there shall be no countries unexplored, except those from which the scientific traveller is debarred,J)y insuperable moral or physical impediments. Geology takes rank among the physical sciences, and is worthy of the attention of the greatest minds. In grandeur, it falls indeed short of astronomy ; and what phys ical science does not ; since, astronomy presents to our optics, or to our intellectual vision, the " great frame work" of the universe ; we pass from the view of our own planet to the entire planetary system, of which our earth is a member ; and from this system, to other and similar systems ; and to the immense systems of suns innumerable, with their attendant worlds, arranged and con nected, in perfect harmony ; performing all their revolutions with out interference, or irregularity, and illustrating the power and wisdom and sustaining energy, of the omnipotent Creator and Governor. Still the structure of a single planet is a subject of great interest and grandeur ; especially as we may reason from it analogically, respecting the structure of other planets. V. Modes of Investigation and Sources of our Knowledge. — Our direct penetration into the earth, by mines, the deepest ex cavations of art, has scarcely exceeded three thousand feet — a little more than half a mile, not ¥?Vo Part °f the earth's diameter or ?TV o Part of its radius. It might therefore at first view, seem that we can attain only a very slight knowledge of the internal structure of the planet, and that it would be idle to attempt to speculate respecting that of which we can see so little. Still, we are able to reason correctly on this subject, for we have many sources of information and ample means of perusing the internal structure of our globe. 8 1. The obliquity ofthe Strata.— The strata or natural beds of rocks are found in all positions, from the perfectly vertical, to the perfectly horizontal. Were they all horizontal, it is obvious, that the edges could come into view, only on the sides of mountains, in the banks of rivers, on promontories, or in artificial excavations ; and that, in a tolerably level country, we might travel over many leagues, and see very little change in the rock formations. But if the strata are inclined to the horizon, then, their edges must come into view, Unless the rocks are concealed by the soil or by ruins. Thus the strata, that in a given situation are many miles below the surface, may emerge, and crop out, in some other place. Were the soil and diluvium removed, from a se ries of inclined strata, then, their edges would appear, and we could have no reasonable doubt that we should see an adequate representation of the subterranean geography, as far as those strata extended downwards ; perhaps for many leagues — or possibly for hundreds of miles beneath the surface. The same instruction is obtained from vertical strata, and indeed from those in all posi tions, except the perfectly flat ; and even then, we are not with out means of information. 2. Horizontality — Density of the Earth. — Strictly, a horizontal position is parallel to the general curve of the earth's surface, con sidered without reference to the hills and mountains. Were this horizontal position strictly /preserved, and were there no perfora tions and ruptures of the strata, by artificial or natural causes, Ave should, except in the sides of hills and mountains, see only the upper stratum of rock, and our knowledge of the geology of the region in question, would be confined, very nearly, to the visible material beneath our feet. A horizontal stratum may overlie parallel strata, descending so deep as to come out obliquely at points distant from the position of the observer, and thus to ex hibit inclined or even vertical strata cutting off a segment of the globe. In common with the pressure of superincumbent masses, it may be proper to mention the density of the earth. By the con clusions of the British and French philosophers, the mean spe cific gravity of the earth is at least twice that of the most com mon rocks and stones. This important conclusion implies nothing more than a highly condensed state in the materials in the interior of the earth ; still it does not prove a prevalence of metals, in the sense in which they are generally known to mankind. It is, however in full proof, that metals, such as are known only to chemists, form the basis of the rocks, and in their oxidized and mineralized condition, they may, from pressure or from other causes, acquire a high specific gravity. This is illustrated by carbon as it exists in diamond, in which it is three or four times as heavy as in the bitumens, and six or eight times as heavy as in charcoal ; alumina, in sapphire, sustains a similar relation to the alumina of clays, and so does pul verulent carbonate of magnesia to that earth in boracite or in chry- soprase ; or silica in swimming fluid (quartz nectique) to the same substance in rock crystal. Thus the specific gravity of the entire mass of the earth compared with that of the surface may present no contradiction or inconsistency. 3. Mines and Wells. — The excavations in mining are the most profound that have been made by art. The deepest mine in the world, that of Truttenberg in Bohemia, penetrates three thousand feet into the earth. ', In all mines, the strata being perforated and broken, we obtain the most satisfactory informa tion, as to the nature and arrangement of the rocks. Few of the mines of England are, in perpendicular descent, deeper than a quar ter of a mile, (Dolgoath in Cornwall,) and none in the United States exceed four or five hundred feet, (Richmond coal mines, and those of Pennsylvania. ) The evidence afforded by wells is of the same nature. The depth attained rarely equals one hundred feet, but in some in stances it extends to two hundred, three hundred, four hundred, &c. as at Carisbrooke Castle in the Isle of Wight, on the plain or valley of London, &c. (Conybeare and Philips.) 4. Boring for Salt Water, Salt Mines, Coal, Sfc. — This affords similar, though less distinct evidence ; because the materials are. brought up, in the state of powder, or at least of small fragments, and a very imperfect idea is thus obtained of their original appear ance ; sufficient however to enable us to decide on their nature. These operations are often carried on to the depth of several hun dred feet — sometimes 600 to 800 feet or more. 10 5. Roads, Canals, and Tunnels. — Roads and canals are some times cut through diluvium, as on the Welland Canal, in Upper Canada, where the cut is in some places, more than fifty feet deep, in a stiff tenacious clay ; and even through solid rocks, as at Lockport on the Erie Canal, where for two miles or more, a very solid, subcrystalline limestone has been excavated by blasting, in many places to the depth of thirty feet, disclosing not only the nature of the rock, but many beautiful imbedded minerals and fossils — strontian, gypsum, calc spar, corals, crinoidea, &c. Tunnels are less numerous, but every one has heard of that of the Duke of Bridgewater, between Liverpool and Manchester, and of the Thames Tunnel, below London, intended to serve as a substitute for a bridge. That under Standedge, between Hud- dersfield and Manchester, extends upward of three miles, and is two hundred and twenty yards below the surface. It appears that they were not unknown to the ancients. From the Stadium near Athens, situated in a natural defile, the van quished charioteers retired through a tunnel which perforated a neighboring hill, and thus those who had failed of victory were screened from the sneers and insults of the populace.* Tunnels are becoming common in this country, as between Philadelphia and Pittsburgh ; at Harlem, near New York ; at Norwich, Con necticut, and in various other places. These and all other excavations into the earth add to our means of geological infor mation. 6. Rivers and other Water Courses. — Brooks gently transport gravel and sand, and rivers rush through mountain defiles, as if they had burst the rocky barriers, transporting not only sand and gravel and pebbles, but at times large bowlder stones, bear ing them along and vexing them with incessant friction, till their angles are rounded or obliterated. The rivers have some times flowed at a higher level, or their waters are the remnants of lakes whose barriers time has broken or worn away ; and water- worn ledges are often found at elevations higher than where the floods can now flow. This is seen two or three miles below Bellows' Falls, on Connecticut River, where the primitive rocks * Dr. Howe's personal communications, Aug. 11, 1828. 11 shew the same water-rounded angles, furrowed lines, and even pot holes, formed and polished by ceaseless attrition, as are seen at the Falls themselves, whose torrents are now incessantly wearing the rocks. Similar facts are observable at the head of Lake George, fifty feet and more above the lake, in ledges of transition limestone, over which no water now flows. The same appearances are seen at the great falls of the Potomac ; where, for a long distance, and at a considerable elevation above the present bed of the river, the angles are rounded and smoothed, and there are numerous holes in the rock, either shallow and irregular, or deep and cylindrical, like those of cataracts, and certainly produ ced by the same causes, the wearing of water, aided by whirling stones.* The passage of the Shenandoah through the Blue Ridge — of the Connecticut at Middletown, through the Haddam hills, and of the rivers in the Rocky mountains through their defiles ; these are a few among innumerable examples of this kind. The rivers have rarely burst their barriers ; in general, they have merely un covered the rocks so that their characters can be observed ; they have not generally formed their own beds, but have deepened and altered their channels. The Genesee and Niagara rivers, whose banks are often precipitous and several hundred feet high, give sections of the strata wonderfully distinct and beautiful. Thus the wearing power .of water contributes to the mass of geo logical evidence. 7. Valleys and Defiles, Banks, Precipices, Cliffs and Pro montories., — In every mountainous country not covered with soil ahd ruins, these natural sections being often deep, abrupt, and of great extent, expose the stratification on the sides of the hills and mountains, and thus the structure is revealed. As a large part of the earth is mountainous, provision is thus made, oh a great scale, for judging of the interior of the planet. The shores of the seas and of the great lakes, and all elevated countries, abound with such exhibitions. Many of them are indeed inaccessible except in boats, but however viewed, they exhibit the stratification and structure more or less distinctly. * American Journal, Vol. iv, p. 44. 12 8. Landslips, Slides and Avulsions.— The peaceful dweller in the beautiful Isle of Wight, in the English channel, not un frequently sees the high chalky cliffs of that coast, that have been undermined by the sea, totter to their fall, till they come thundering down in piles of ruins ; and even at some distance inland, away from the sea, they occasionally slide or slip from their seats, overwhelming the plains below. The Alpine mountaineers witness still more stupendous catas trophes. Large portions of mountains are precipitated with fright ful devastation upon the valleys and plains, filling the bosom of lakes, spreading desolation far and wide, and burying villages in the wreck, or sweeping them away by the sudden rush of the waters. The' mountains of Vermont and of New Hampshire, have been the scenes of similar catastrophes, and the Notch in the White Mountains of the latter State, will long record the desolations of 1826. The Notch is a grand defile in these mountains, five or six miles in length, formed by a double barrier, rising ab ruptly half a mile or more in perpendicular altitude, from both sides of the wild roaring river Saco, which washes the feet of the barriers. A single carriage can hardly pass between the stream and the mountains, and the road is in some places cut into the mountain itself. The ridges are capped by castellated turrets of rocks, rising in high zigzag turns, which thus imprison the observer in a vast, gloomy gulf. The sides are deeply scarred by many floods, and especially by the memorable deluge of the night of August 28th, 1826, which destroyed, in a moment, an entire family of nine, and left not one to tell their story. The Willeys occupied a lonely house in the wildest part of the Notch, at the foot of the mountains ; it was a resting place for travellers. For two seasons before, the moun tains had been very dry, and on the morning of August 28th, it commenced raining very hard, with strong tempestuous wind • the storm lasted through that day and the succeeding night, and when it ceased, the road was found obstructed by innumerable avalanches of mountain ruins, which rendered it impossible to pass, except on foot. They were rather slides than ruptures of the rock : they began at or near the mountain top, and bore down 13 the precipitous sides, the shrubs, the forests, the soil, stones and rocks ; and of the latter, many of great size. One of the torrents descended behind, the house, and dividing into two branches, bore away the unhappy family, who, in the deep darkness and wild fury of the tempest, issued from their dwelling only to be overwhelmed by the torrent, which desolated the mountain gorge for a distance of two miles* filling it with almost continued masses of ruins, borne down by the deluge from both sides of the defile. Such are some of the disclosures made by violent torrents, by slides and revulsions. 9. Revelations by Fire. — Volcanic eruptions throw up into daylight the foundations of the fathomless deep below, in the form of ejected masses, or in rivers of ignited and fluid rocks, which congeal on the surface of the ground, either inflated, like the scoria? of furnaces, or in" solid forms, with no visible im press of heat. They often contain very perfect and beautiful minerals, conceived in the volcano, or dislodged from still earlier beds, from a more profound igneous abyss, from which they are urged along by the irresistible current that often ruptures the crust of the earth, and covers it with a fiery deluge. In addition to the products of actual volcanoes, we observe the ignigenous rocks, crystallized or deposited from fusion, both in the earliest and in many of the more modern epochs, injected among, and cutting across strata of almost all descriptions and ages, and thus assim ilated to known products of internal fire ; these proper rocky masses, the granites, the sienites, the porphyries, the serpentines and the traps, give authentic information of the unapproachable gulf of fire whence they were projected. 10. By Cold and Hot Springs and Gases. — The infernal waters that gush cool from the fountains on land or under the * During a visit to this place in May, 1828, two years after the event, there was still visible a vast rampart of earth, stones, rocks, and trees piled up behind the house, at the place where the torrent divided, and left the building unharmed, although it swept away the barn and cattle, sparing, however, » floek of sheep which lay near by upon a green sward. I was there again in August, 1837, nine years after my former visit, and found the ruins near the house so covered with earth, and even grass, that they were almost concealed from the eye, thus serving as a geological chronometer. 3 14 sea, or those that spout in boiling geysers from the deep caverns where their imprisoned vapors accumulate explosive force ; all these bring to the surface the materials of the interior, and con spire "with tornadoes of gas bursting from volcanoes and other vents, to reveal the deep secrets of the earth. VI. Fruits or Results of the Observations made on the Structure of the Crust of the Earth. — The earth is not, as ignorant persons usually suppose, a mere rude and unarranged heap of rocks and minerals, grouped together without order or plan, and incapable of being rationally investigated. Order, so conspicuous in the mechanism of our planetary world and the stellary universe ; in the equilibrium of projection and gravitation ; of cohesion and expansion and chemical affinity, and in the structure and exact economy of animals and vegetables, per vades, indeed, all the works of creation ; nor is it less capable of demonstration, although the proof is less obvious, in this un conscious earth, than in the other departments of God's universal dominion. VII. Beauty and Interest of Geology as a Science. — In relation to the beauty and interest of geology, we may remark, that no field of science presents more gratifying, astonishing, and (but for the evidence) incredible results. Man has been but a few thousand years a tenant of this world ; nothing which we discover in the structure of the earth, would lead us to infer that he existed at a period more remote than that assigned to him by the Scriptures. Had he been cotemporary with the animals and plants of early geological periods, we should have found his re mains, and his works, entombed along with them. Opinion of Berkeley. — This argument forcibly impressed the mind of Bishop Berkeley, a century ago, and the following beau tiful passage is cited from him by Mr. Lyell.* " To any one who considers that on digging into the earth, such quantities of shells, and in some places, bones and horns of animals, are found sound and entire, after having lain there, in all probability, some thousands of years ; it would seem probable that gems, medals, and implements in metal or stone, might have lasted entire, bu- * Principles, 5th edition, Vol. m, p. 255. 15 ried under ground forty or fifty years, if the world had been so old. How comes it then, to pass, that no remains are found, no antiquities of those numerous ages preceding the Scripture ac counts of time ; that no fragments of buildings, no public mon uments, no intaglios, cameos, statues, basso-relievos, medals, in scriptions, utensils, or artificial works of any kind, are ever dis covered, which may bear testimony to the existence of those mighty empires, those successions of monarchs, heroes, and demi gods, for so many thousand years ? Let us look forward and suppose ten or twenty thousand years to come, during which time, we will suppose that plagues, famines, wars, and earth quakes, shall have made great havoc in the world, is it not highly probable, that at the end of such a period, pillars, vases, and statues, now in being, of granite, or porphyry, or jasper, (stones of such hardness as we know them to have lasted two thousand years above ground, without any considerable alteration,) would bear record of these and past ages ? Or that some of our cur rent coins might then be dug up, or old walls, and the founda tions of buildings, show themselves, as well as the shells and stones of the primeval world, which are preserved down to our times."* This remarkable passage proves that the great man from whom it fell, saw the geological argument in a true light. and felt its force to such a degree as to convince him of the great antiquity of the earth, which he justly viewed as in no way in consistent with the comparatively recent origin of man, or with the historical account of both events contained in the Genesis. It is easy to understand how such a mind would have been con vinced, warmed, and excited even to enthusiasm, by the discov eries that have burst upon us during the last fifty years. VIII. Organic Remains. — As we descend from the alluvial under our feet, through the strata, the lowest of which lies upon the granite, or the early slates, we are almost never without the records of life, in ages long past, and those records are drawn both from the animal and vegetable world. Early Animals. — The shells and forms of molluscous and tes taceous animals are every where seen ; their casts, and their sub- * Alciphron, or the Minute Philosopher, Vol. n, pp. 84, 85. 1732. 16 stance, are apparently preserved in stone, but are really converted, by the substitution of mineral matter, into true fossils. Myriads on myriads of these things are found, not merely in the visible, superficial strata, but in the heart of the mountains, and at pro found depths, forming an essential part of the solid frame work of the globe. The animals and plants are not accidental resem blances, but authentic specimens of organic antiquity, enclosed in the strata and mountains, as the materials, in mechanical or chemical suspension in the waters, concreted around them. It was impossible that they should be due to any sudden or acci dental event ; the organic beings came into life, as now — per formed their parts as now, and were entombed in the forming masses, which were therefore, of more recent origin. Fossil Fishes. — If we descend with Agassiz* from the strata of newest formation, to those that lie near, or upon the primary rocks, we are astonished and delighted to find not only that shell fishes -and crustaceous and molluscous animals, of various kinds, have existed in the early ages, but that fishes, furnished with fins and vertebrae, have occupied the waters of almost all geological ages, since life began, and that among the earliest, even those that are buried beneath the coal, there were races of great size, power, and ferocity ; formidable from their teeth and jaws, which had, in some species, the structure of carnivorous reptiles, and whose forked tails, with unequal flukes, enabled them quickly to turn over on their backs, before striking their prey. The fossil fishes, of particular genera and species, are characteristic of particular geological formations — they extend geographically, far and wide, to distant countries, so that certain species may, if found at all, be expected in similar rocks in Europe, in America, in Asia, and Africa, and they are of every size, from inches and fractions of an inch, to several feet. They occur either solitary, or in groups, or in fragments, or in immense shoals, like those of Mount Bolca, near Verona, in Italy, where there are more than one hundred species ; still, not a single fish of the strata that precede the most recent tertiary, is identical in species with any now existing in the waters of the globe. The great wiiler on fossil ichthyology, of Noufrhatel, Switzerland. 17 Fossil Vegetables. — Vegetables are found in nearly all geolo gical ages, after the granite family, and the labors of Count Stern berg, of Adolphus Brongniart, and others, have proved that a pe culiar vegetation, adapted to the temperature, the degree of mois ture, and other circumstances of the earth's successive surfaces, attended the different geological epochs. Splendid and expensive works are now in the hands of geolo gists, containing exact delineations of the fossil vegetables, as far as they have been ascertained. They are of all dimensions, from minute confervse and lichens, to gigantic stems ; their struc ture, from mere fragments and ruins, to perfect plants and trees, has been beautifully delineated, >roots, trunks, branches and leaves, with the most delicate ramifications of the skeletons of the latter ; in some rare cases, the more perishable organic fruc tification has been made out, and the fruits themselves Mve been identified. Vegetation of the Coal Period. — The most exuberant ancient vegetation appears to have been that of the coal period, and its en tombed treasures now supply the world with fuel, especially in countries where the forests are exhausted, or where economy of the modern vegetation, or preference for the results of the an cient, decides the choice. Varieties of the Ancient Fossil Vegetation. — The ancient vegetation appears in many forms, as in that of lignite, of coal, and of siliceous, calcareous, and ferruginous petrifactions, still pre serving the structure peculiar to different species ; and this has been made still more distinct and satisfactory, by cutting thin slices of the petrified trunks, and grinding them down until they be come so thin as to be transparent, when the microscope reveals the internal arrangement of pores and fibres, which characterizes the family. Thus, it has been made to appear, that coniferous trees of forest growth, preceded the coal formation in the south of Scot land and the north of England, and that Zamias, Cycadeee and other palm-like trees preceded the chalk in the south of England. No species of the ancient world is "identical with any one of the modern, and, as has been already remarked, the early vegetation implies, generaUy, a warm and moist climate, and great fertility of production. 18 Aquatic Animals — Reptiles. — Animals, almost exclusively ma rine, attest the great prevalence of the ocean in the earlier geolo gical, periods, and it is not until we have passed the coal in the ascending order, that we begin to find reptiles of marine, or am phibious families, and ultimately, still higher up, of terrestrial races. With a similarity of type to the reptile families of the present day, both their genera and species are, however, without a single perfect copy in modern times. Some were carnivorous, and swam in the shallow seas, estuaries, lagoons, and bays, and prey ed upon fishes, molluscous animals, and each other. Some lived on land, and were herbivorous, and although a few species, the megalosaurus and iguanodon, for example, were colossal in size and terrible in form, it is probable that the latter of these terres trial saurians was harmless and inoffensive, while the tooth of the megalosaurus would indicate a ferocious animal of prey, like the marine saurians. Bones of many genera and species of the rep tile tribes, especially the saurians, have been found, and of some individuals, entire, or nearly perfect skeletons ; — among them, those of vast dimensions have been discovered, enclosed in the solid rocks, along with their petrified and half-digested food, and with their exuviae, called coprolites. Marsupials. — If the reptiles formed the transition from the marine animals upward — the marsupials, as they are called, were the link between the ancient reptiles and terrestrial quadrupeds. The marsupials, of which the opossum is an example, receive their young (which, although b6rn, are still immature) into an exterior pouch or abdominal sack, and there nourish them at their paps, until they are fitted to go abroad, and to encounter the vicissitudes of their peculiar modes of life. These are the only animals hitherto found below the Chalk which approximate to the proper terrestrial character. Dr. Mantel! has, however, found the bones of birds in the Wealden beneath the Chalk, Dr. Buckland found them or the bones of flying reptiles in the Stonesfield slate, and Prof. Hitchcock has discovered numerous tracks of animals, believed to be those of birds, and possibly of reptiles, some of them of gigantic dimensions, in the new red sandstone of the Connecticut river. Fossils of the Chalk and Tertiary. — The Chalk then follows with its immense and varied marine treasures ; and then the lower 19 tertiary, still marine, and then the middle tertiary, where proper and fully characterized terrestrial animals are first found ; then, through the remaining beds of tertiary, both marine and fresh water, we find molluscous animals, fishes, reptiles, cetacea and vegetables, verging towards, and even identical with those of our own times. Occasionally we discover also terrestrial animals, but still, dif ferent from the modern, until, at last, in the diluvium, and allu vium, and the most recent sedimentary, and concretionary forma tions, we discern animals and plants, still more and more like those now living, and finally graduating into perfect identity with ex isting races. The pages of our author will disclose the great variety and ex traordinary form, and, in many cases, colossal dimensions, unri valled at the present time, of some of the ancient animals, the me gatherium, the sivatherium, the dinotherium, the mastodon, the elephant, the hippopotamus, the rhinoceros, the cavern bear, the tiger, and many others. In consequence of the most recent dis coveries of geology, we are hurried from that which is stupen dous and vast, to that which is inconceivably minute. The ex tremes of creation meet in the mineral kingdom. In the solid rocks are found both the colossal reptiles, and the microscopic in fusorial animalculae. Ehrenberg has discovered that polishing slate is made up of animalculae so minute, that forty one thousand millions of them are required to fill a cubic inch, in every grain of which there are one hundred and eighty seven millions, and their siliceous shields are the cause of the well known effects of the tri- poli, or rotten stone, in polishing steel, &c. An analogous consti tution has been discovered in flirit, opal, and bog iron, and the deposits of our modern peat bogs in this country, are filled with similar animalcules, the figures of some of which have been given by Prof. Bailey, in the American Journal of Science, vol. 35, p. 118. Man no where Fossil. — Man and his works appear only in the last stages, associated with just such beings as now exist, both in the animal and vegetable world. General Remarks. — Such is an exceedingly general and very imperfect sketch of the progressive creations of animals and plants, that have inhabited our world — have become extinct, and are, in countless myriads, entombed in the rocky strata, and in the solid 20 mountains. It is only on the upper surface that we discover loose and scattered ruins, either in the soil, or buried in masses of gra vel, sand, and clay ; ruins of rocks and fragments of strata, along with the relics of animals, trees, and smaller plants, such as we could in any reason, attribute to the catastrophe, or catastrophes of rising and rushing water, the, deluges of geologists, or the deluge of the Scriptures ; the latter, almost alone, being admitted to the contemplations of those who are uninstructed in our science. Now, it is matter of physical demonstration, that the_ earth ex isted for many ages before man was called into being. The whole course of geological investigation proves this view to be the only one that is consistent with the facts. To be convinced of its truth, it is only necessary to become thoroughly acquainted with the innumerable records of a progressive creation and destruc tion which the earth contains, inscribed nn medals, more pregnant with historical truth, and more worthy of confidence, than those that have been formed by man ; as much more as nature exceeds in veracity, the erring or mendacious records of the human race. IX. Some Features in North American Geology. — Probably no country is more favored in the nature, abundance, variety, and distribution of the most important mineral treasures. The limits of these preliminary remarks must prevent even the most general summary of our geological formations, or at most, admit of noth ing more than a skeleton ; but the materials for information, al ready abundant, are yearly increasing, as may be seen in the various public reports, in the transactions of learned societies, and in the journals of science. Of the primary and transition rocks, to which we may add the coal formation and the early secondary, we- have immense ranges, extending in a northeasterly and southwesterly direction, through the continent, and comprising most of the minerals and many of the fossils that are found associated with such groups in the old world. The Alleghanies, (including many mountains having local names,) following the general bearing of N. E. and S. W., and ranging between the Mississippi and the Atlantic, form, with their branches and connected chains, the great rain-shed of the coun tries east and west, and rising to two, three, four, and five thou- 21 sand feet and more,* give direction to the streams and rivers, either to the Mississippi, the Atlantic, or the great lakes, and the St. Lawrence. Rocky Mountains. — In like manner, the far more stupendous chains of the Rocky Mountains, whose loftiest peaks are reported to be between three and five miles high,f give a geological char acter to the regions east and west, in which directions the waters flow to the Mississippi and to the Pacific, while the other contri butions descend to the Gulf of Mexico, and to the Northern Ocean, lt is to be regretted, that in the United States proper, there are no mountain ridges, or solitary peaks, that pierce the region of perpetual cold. . Mount Washington. — Mount Washington, of the White Moun tain group in New Hampshire, which approaches a mile and a quarter in height, being in 44° of north latitude, and on a continent whose average temperature is many flegrees below that of Europe, throws off its snowy mantle only for a short season, in July and August, while it is clad in white, during the remaining months of the year. Even on the first day of September, (1837,) as adventurers upon this Alpine mountain, J we were, both on its flanks and summit, involved in a wintry tempest of congealed vapor, formed into splendid groups of feath ery and branching crystals, unlike to the snows of the lower re gions ; the driving masses came in fitful gusts, veiling in a white cloud, all objects far and near ; but occasionally breaking, ad mitted a flood of solar light to render visible this hoary pinnacle, and the deep gorges and valleys of the neighboring groups of mountains. The mountains of Essex county, State of New York, between Lake Champlain and the St. Lawrence, approach the White Moun tains in altitude, but no one of them is permanently snow-clad. Mountains of Central Europe. — It is otherwise in Europe, whose grand central group of- Mount Blanc, and the various * Professor Mitchell, University of Chapel Hill, states that the Black Mountain in North Carolina, is 6476 feet above the level of the ocean. See Am. Journal, Vol. xxxv, No. 2. t See Professor Renwick's Outlines of Geology. j; See Am. Journal of Science, Vol. xxxiv, p. 74. 4 22 Alpine mountains, rise far into the region of perpetual congela tion; and Mount Blanc would pierce that region even at the equator. Thus is provided an eternal store-house of ice and snow, over whose wintry surface, the winds, rendered heavier by contact, glide into the valleys and plains of the countries at the feet of the mountains, and thus temper even the warm climate of Italy, preventing the extreme vicissitudes which we experience. But these immense natural magazines have a still more impor tant relation to the irrigation of the vicinal countries. The melt ing by the heat of summer, supplies copious streams to feed the innumerable rivers that flow from these grand fountains to almost every part of continental Europe, south of the Baltic. Thus, the effects of drought are in a great measure prevented, while de structive mountain floods are of rare occurrence. From the absence of such mountains, we have no permanent stores of ice and snow, and, consequently, our rivers are liable to extreme variations of altitude and force. The Ohio, in midsum mer, sometimes leaves numerous fleets aground, while occasional risings, from deluging rains, aided perhaps by the melting of the snows of vast regions, swell the river to an immense flood, that spurns the barrier of the banks, lays villages and cities under water, and expanding into an internal sea, rushes with wasting violence, over the wide-spread meadows and farms. For this reason, hydraulic engineering is, in this country, at tended with peculiar difficulties, both on account of a deficiency and an excess of water ; the former rendering the works inope rative, and the latter invading or sweeping them away. The future civilized inhabitants of the countries near the Rocky Mountains, (excepting, of course, the immense sandy deserts, which near the eastern slope emulate the sterility of Arabia and Zahara,) will enjoy advantages, in many respects, similar to those of Piedmont, Switzerland, Germany, and France, and it is easy to predict, that peculiar structures, and a peculiar state of society, will be modelled in relation to the sublime physical features of those truly Alpine regions. From this, his native land, we have too much reason to expect, that, despite of the efforts of the benevo lent to avert the impending doom, the red man of the forest, not reclaimed to humanity, but abandoned to his fate, will vanish 23 before the prevailing arts and power, and the still more prevailing seductions of civilized life ; the exterminated victim of cupidity and cruelty. Influence of Geological Structure on Society. — It is perfectly apparent to geologists, that the scenery of a country is not more exactly stamped by its geological formations, than are the man ners and employments of its inhabitants. This argument, so beautifully displayed by Dr. Buckland,* with respect to England, is capable of an equally satisfactory application to this country. New England. — The bleak hills and long winters of New England are unfavorable to the most extensive and profitable agricultural pursuits, while the extensive and deeply indented sea-coasts, abounding with harbors, headlands, rivers and inlets, naturally produce an impulse towards the ocean, which, conspir ing with the original adventurous character of the population, sends them roving from the arctic to the antarctic circle, till the wide world is laid under contribution by their enterprise. Their numerous streams and waterfalls furnish the cheapest means for moving machinery, and thus manufactories spring up, wherever, in their expressive phraseology, there is water power ; and steam supplies local deficiencies of moving force. Ingenuity, conspir ing with a general system of education, is excited under such culture, to produce numerous inventions, and hosts of young men seek their fortunes successfully abroad as mechanics, seamen, tra ders, instructors and politicians, who thus operate powerfully, and, we trust beneficially, on other communities. Southern States. — The immense tracts of rich alluvium in the southern states — the mildness of the climate — the coasts, less abounding with safe inlets, and often modified by the action of the existing ocean, with a population not originally commercial, give a decided impulse to a vast agriculture, and a few great sta ples form the chief reliance of the landholders. It is easy to see, that this state of things grows out of the recent secondary, the tertiary, and the alluvial formations, which constitute the ocean barrier from Staten Island to Florida, and from Florida to Texas, extending inland towards the mountains. * Bridgewater Treatise. 24 Western States.— In the west, the boundless fertile prairies and other tracts of productive soil conspire with remoteness from the ocean, to indicate agriculture and pasturage as the main em ployment of the inhabitants, while exhaustless beds of coal, limestone, plaster of Paris, and iron, and rich deposits of lead, and copper, and salt fountains both numerous and copious, fur nish means for a manufacturing, as well as an agricultural popu lation. These pursuits occupy the greater number of the people, while many find a profitable employment in navigating those immense inland seas, the great lakes — and the vast rivers, which run thousands of miles before they mingle with the ocean. What geologist fails to perceive, that this state of things is the result of the immense lower secondary and transition formations which cover the western states, sustaining portions of tertiary, and like all countries, alluvial depositions. While New England produces granite, marble, and other building materials, of excel lent quality, Pennsylvania, with the western and several of the southern and southwestern states, supplies inexhaustible maga zines of coal, to prompt and sustain the manufacturing interests of this wide country, and to aid its astonishing navigation by steam, already of unexampled extent on its internal waters, and destined at no distant day, to compete, on the main ocean, in amicable rivalry, with our parent country. Geological Treasures. — Our coal formations are unrivalled in the whole world, in richness and extent; our iron and lead are in the greatest abundance and excellence ; Missouri has mountains of pure oxide of iron, that have no compeers, and there is a fair prospect that copper will also abound in the West. We have regat deposits of limestone and marble, of plaster of Paris, marl, and salt, and of building stones of almost every kind ; our soils are so various in quality, and in geographical position, that almost every agricultural production is obtained in abundance. It is obvious then, that we have all the physical elements of national and indi vidual prosperity, and that the blame will be our own, if we do not follow them up by proper moral and intellectual culture, which alone, can render them sources of public and private happiness. Geological Deficiencies — Upper Secondary. — Ofthe upper sec ondary, below the chalk, and above the new red sandstone, lying 25 higher than the coal, we have no well ascertained strata : rocks of oolitic structure we may have, but it is not ascertained that we have the true oolite of England and continental Europe, nor have we traced the Wealden nor the Lias* with their colossal animal wonders. Equivalent of Chalk. — Chalk, properly speaking, appears to be absent from the United States, but there is an equivalent to the chalk formation, containing similar fossils, between the Delaware River and the shores of New Jersey, as well as in various places in the south, and, as we are recently assured, in Missouri. Absence of Volcanoes. — The principal deficiencies in the geo logical formations of the United States, are in the absence of active volcanoes, as well as of most of the members of the upper secon dary. However delightful, active volcanoes, with their earth quakes and eruptions, may be to speculative geologists, the sober, unscientific population, may well rest quite contented without them, satisfied to barter the sublime and terrific, for quiet and safety. Although the soils formed from decomposed lava are often fertile, and the vine flourishes, and the clusters smile most remarkably, on the flanks, and at the feet of the volcanic moun tains of warm countries, these influences are too local to be of much importance to agriculture. Within the United States proper, including the states and terri tories beyond the Mississippi, and east of the Alleghany Moun tains, there is not, so far as we know, a single active volcano, nor even an unequivocal crater of one that is dormant. It remains yet to be decided, whether in and beyond the Rocky Mountains, quite to the shores of the Pacific Ocean, there are any active vol canoes within our parallels of latitude. Both north and south of our limits, there are on the Pacific shores and the islands, numerous volcanoes, and it would be strange indeed, if there were none, within our extensive posses sions on the same coasts. Records of fire in the far West. — However this may be, there remains no doubt that fire has done its work, on a great scale, among the Rocky Mountains, and between them and the Pacific ; * It is plain that the lias, so called, in the West, is not the lias of England. 26 for all our travellers attest the existence of immense regions cov ered with scoriae and other decidedly igneous products, as if there had been actual and vast eruptions, within a period too short for decomposition to have reduced those tumefied and semi-vitrified masses to soil. Trap and Basalt. — Regular formations of trap and of basalt, with symmetrical columns, are common among and beyond the Rocky Mountains, and the rocks of this igneous family are fre quent in many parts of the old United States. They abound in New England, New Jersey, and the Carolinas, and, as usual else where, they protrude their dykes among other rocks. We are not aware that they have invaded the coal, as in Europe ; but in New England, and especially in New Hampshire, they often divide the primary rocks, cutting even granite mountains from top to bot tom ; branching out, in many places, with numerous veins either dying away to extinction, or perchance, returning again to the main current after having cut off a portion of the invaded rock. The White Mountains of New Hampshire, abound with such fea tures. Similar intrusions are found in the mountains of Essex, Lake Champlain, New York, and in many other places, and the primary rocks on the coasts of Massachusetts and Maine, as well as in the interior, are wonderfully cut up, by invading veins and dykes of trap, basalt, porphyry, and even of granite itself. It appears, also, that in the state of New York, there are similar intrusions of limestone into other rocks, including the primary, and not excepting granite.* Tertiary Formations. — Our tertiary formations are exceedingly extensive, and are rich in fossils, chiefly of the middle and earlier eras. They bound a large portion of the sea coasts south of New England, quite to the Mexican gulf, and up the Mississippi and Missouri. Oceanic deposits are found also, extending hundreds of miles into the interior from the coasts, where, as well as near the sea, they furnish, in the calcareous marls, inexhaustible re sources for agriculture. Even on the shores of New England, there are marine tertiary deposits, as at Gay Head, in Martha's See Professor Hall, in the Geological Reports for 1838. 27 Vineyard, and elsewhere in that vicinity, while there are, in every part of the United States, innumerable inland deposits of fresh water tertiary. Boulders. — In boulders and rocks of transport, our country, especially in the north, northwest and northeast, abounds ; vast regions of older secondary, and of transition, are occupied, more or less, by ruins of primary rocks, some of them of vast size, while the primary countries themselves, and the transition too, are marked by their own disjecta membra. We are precluded by our limits, from discussing the causes of their transportation, whether by floods, ice floes, or other motive powers.- Pebbles, gravel and sand, are found here as in other countries, transported and arranged by water.* X. Classification and Nomenclature of Rocks. — We are gratified that our author, in the fifth edition of his work, has pre served the classification of rocks, to which the geological world has been so long accustomed. The changes that have been, from time to time, proposed by eminent men, — Brongniart, Cony- beare and Philips, Lyell and others, have commanded our careful consideration, and we find them, as we might expect, since they are proposed by men of knowledge and talent, supported by powerful reasons ; but still these reasons appear to us not sufficiently impor tant to counterbalance the great inconvenience of novel terms, espe cially as there has been no decisive adoption or approbation of either of the new nomenclatures ; nor are most of them free from the objection made to the established language — namely, that of im plying theoretical views. It would be easy to prove this by in stances cited in illustration ; nor does the old language necessarily imply more of theory, than that there is among rocks an order of succession, and that there are also prevailing characteristics, dis tinguishing the classes of rocks from each other ; and so much of theory as this must be admitted by any language that may be adopted, whether the terms are significant or not. The terms primary, transition, secondary, tertiary, alluvial, di luvial, volcanic, trap, &c, are still in general use, and they are * These remarks on American Geology, were inserted also, in an Introduction to Dr. Mantell's Wonders of Geology, first American edition, 1839. 28 retained even by those who introduce new terms, for the latter must, in order to be intelligible, be translated by means of the former. It is not necessary that every portion of a primary rock should, in its present form, be older than the masses that are gen erally superincumbent : granite may shoot its veins into the rocks that he over it, without invalidating its general claim to a prior existence, at least in the form of materials, if not in the present mode of aggregation. New terms are, with propriety, introduced into geology when they are needed, as into other sciences ; thus, the vast secondary is divided into older and newer, or upper and lower ; the im mense tertiary is now separated into three divisions, older, mid dle, and newer, or in Mr. Lyell's language, eocene, miocene, and pliocene, and the latter of these is again subdivided into older and newer. There are, however, limits to the utility of subdivisions ; where they are very numerous and minute, and withal founded on the oretical considerations, they may become inconvenient, and pro duce the confusion they were intended to avoid. This was the fact in the minute details of the Wernerian language, while its leading terms were happily chosen. If they were first contrived as a key to Werner's peculiar the oretical views, they no longer retain that peculiarity ; they are now rather indicative of order and character in the formations, than of a theory of origin ; and as this order and these distinctive characters really exist, they may, without inconvenience, be de signated by these terms ; nor do any terms that have been con trived, appear to us more unobjectionable. We must concede the propriety of local names for local forma tions, especially where they are remarkable in their structure and contents. Such is the Wealden in the S. E. of England, the region which Dr. Mantell, and other English geologists, have so admirably illustrated ; it is indeed a member of the upper secon dary, but it is unique and most interesting in its geological char acteristics. Such, also, to some extent, is the Stonesfield slate, a member of the lower oolite and middle secondary, but it pre sents organic remains, different, in some respects, from those of any other rock — at least, of any one that is coeval. 29 These local names have, however, been much multiplied, es pecially in England, where new terms are now proposed for sub divisions of the transition series, for which there exists, indeed, a commanding necessity, rendered apparent by the researches of Mr. Murchison, among the slates of Wales. XI. Suggestions as to Geological Agents and Geological Theory. — Creation is the work of God. The earth, in com mon with the whole universe, unfolds volumes filled with proofs of intelligent, wise and benevolent design. The work bears the impress of a mind, omniscient — of energy, omnipotent — of skill, infinite — and of consistency and benevolence — without doubt real and perfect, although not always obvious to our lim ited faculties. Without presuming to know, when or how, the act of creation was performed, we may, without presumption, inquire as to the physical powers that were put forth in arranging the materials of the earth, and as to the manner in which they may have operated to produce the grand and multiform results. Granite — the deepest rock of which we have any knowledge, is not a mechanical deposit ; it is made up principally of crystals, or of parts more or less crystalline in structure, mutually adjusted by salient and re-entering angles, or confusedly aggregated ; pre senting occasional cavities, lined by more perfect crystals. Every thing implies a previous state of corpuscular mobility, the parti cles having liberty of motion ; and the only powers equal to the effect, are heat and electricity, aided by water and the saline, al kaline, acid, and other soluble chemical agents ; these we now find abundantly in the constitution of the rocks, and they or their elements were therefore originally provided in the grand store house of created materials. Comparative Agency of Fire, Water and Electricity. — The accumulation of geological evidence leaves no doubt of the prevalence of fire in the interior of the planet ; the portion in actual ignition or fusion, in order to be sufficient to feed the host of volcanoes in various parts of the globe, must be very ex tensive, and the regularly increasing temperature as we descend into the earth — regular on the whole, although accumulating in different ratios, in different places aud countries, concurring with 5 30 the evidence of volcanoes, fully establishes the dominion of in ternal fire. Our knowledge of the powers that generate heat, in many modes of chemical and mechanical action, and more than all, by galvanism, renders it entirely credible, that any portion of the crust of the earth, whose origin appears to have been igneous, may have been really derived from that source. Any part of the interior may, therefore, have been melted, and if not now in ignition or fusion, it may readily pass to that condition by a transfer or increased energy of the powers which, even in our comparatively small experiments, are sufficient to generate, in stantly, the most intense heat, in the most unfavorable circum stances. It is extremely probable then, that heat may have wrought those wonders in our earth which demand extensive fluidity — fluidity by fire, rather than by water. Fire and galvanic electri city have this vast advantage over any fluid solvent, namely, that they can render any substances fluid, without the addition of more matter, to that which is to be thus made fluid ; the materials themselves become, in a sense, the source of the heat needed to melt them, and it is without doubt that this agent may be suffi cient to render the entire planet fluid. This may be granted, without deciding the question, whether it has ever actually been in this condition. Thus far we believe, that the opinions of most geologists will carry them at the present day ; and if our views are different from those formerly expressed in connection with this work, the change is the result of conviction founded on ad equate evidence. It is now apparent that heat in the earth is not an accidental occurrence, like our fires kindled on the surface ; it is not the re sult merely of transient combustion ; it is an inherent and ever active principle, concentrated at one time in a particular region, and at another time in a different place ; now, slumbering for ages, and then revived or transferred, but unextinguished and un- extinguishable. It must have been prevalent in early ages in the deep interior of the planet, and indeed all that now bears evi dence of an origin from fire, is by far the greater portion of the earth, while the depositions evidently produced by water, and by aqueous solutions, are but a very small film compared with the whole. 31 Water and Soluble Chemical Agents. — Leaving out of the question, for the present, the geological formations that are evi dently aqueous, and are so regarded by all geologists, we are com pelled to admit, that in the early periods of the planet the ocean must have prevailed far more extensively than now, if not uni versally; or, in other words, the existing dry land must have been under water. If( granite had been melted under atmos pheric pressure alone, or when there was no atmosphere, its sur face would have been inflated and porous, like the upper current of lithoid lavas ; but, if melted under the pressure of water, it may be of several miles in height, it would, on cooling from fusion, crystallize, and become as we see it, a solid mass. The same re mark will apply to sienite, to porphyry, to trap, to serpentine, &c. which are admitted to have had an igneous origin. Early and Present Ocean. — Now, what properties may we fairly suppose would have belonged to the waters that hovered over the yet embryo islands and continents, still immersed in their native element, before the elevation commenced, by which the dry land was made to appear, and what qualities may we not suppose the present ocean to possess at profound depths, where its pressure is great, and in those places where the heat may also be active and long prevailing. Modified Properties. — Water, under such circumstances, must evidently be a fluid of very peculiar properties. It must contain all the chemical agents not only that are soluble in it, but also that are soluble in a compound fluid, consisting of water, and of other agents still more active. The acids would be solvents for the alkalies, the metallic oxides, and most of the earths ; the alkalies would be solvents for alumina and silica ; acids and alka lies may have alternately prevailed ; and even if acids, alkalies, earths, and the other metallic oxides, had been present at the same time, and had formed salts, these compounds, so far as they were soluble in water, would also impart to the fluid peculiar solvent powers ; while those compounds which were precipitated, would be thus removed, so as not to impede other agencies. In the constitution of mineral bodies, we find all the active chemical agents, oxygen, iodine, chlorine,. fluorine ; and doubtless bromine will be found ; the acids and alkalies are abundant ; soda exists 32 in great quantities ; potassa is not unfrequent in minerals, and lithia is found in several. The alkalies are largely, and the alka line earths are considerably soluble in water ; all the earths ex cept silica unite with acids, and even this is easily dissolved by hydro-fluoric acid. Thus all the metallic oxides are soluble, either in acids or alkalies ; the metals and combustibles combine readily with oxygen, chlorine, iodine, bromine and fluorine ; carbon* and other combustibles become soluble by combination with each other, and with the supporters of combustion. If the elements came from the hand of the Creator in a state of freedom, their first action must have been attended with in tense energy, and innumerable combinations and decompositions would have taken place, the great agents encountering each other at every turn, and thus developing a new order of things. Solubility of Silica and Alumina. — It is worthy of remark, that quartz, feldspar and mica, the prevailing minerals in granite, gneiss, and mica slate, are composed mainly of silica and alumina. Now silica and alumina are (as already remarked) readily soluble in the fixed alkalies : alumina is soluble in acids ; silica in hydro-fluoric acid, and this agent can render silica gaseous. There are notable quantities of potassa and soda in both feldspar and mica, and fluoric acid has been found in the latter ; it appears therefore, that those solvents were present at the birth of these minerals, and entered into their constitution. Alkali exists in the earth in vast abundance, and thus even silica and alumina may have been provided with an appropriate solvent. The solubility of all the existing materials that form the crust of the globe ; their solubility either in their elementary forms, or in their proximate or complex combinations, is then a truth clearly demonstrable, and actually demonstrated. Auxiliary Power of Heat. — The activity of chemical agents, especially if subjected to pressure, is much increased by a high temperature. There can be no reason why we should suppose, that those causes which now feed the fires of more than three hun dred active volcanoes, were dormant in the youth of the planet. On the contrary, innumerable extinct or quiescent volcanoes re cord the ancient energy and extent of internal fire, which would * Carbon and chlorine do not unite directly, but they combine through the agency of hydrogen in defiant gas and chloric ether. 33 operate both as an auxiliary to solution, and in its own proper agency by fusion. Add to all this, the intense action of the deep seated fires which have melted granite and other igneous rocks, and we find ample evidence both of the direct and auxiliary agency of internal heat. Before the emergence of the land from the ocean, all volcanoes must have been submarine, as many now are. They would all therefore act under vast pressure, a pressure not even approached by modern experiment, and the heat thus accumulated must have given great activity to water and to aqueous solutions of chemical agents. Thus both mechanical and chemical laws conspire to produce solution and fusion on the greatest scale, and with the greatest energy. By fusion and softening by fire ; by solution and soften ing by water, and its dissolved chemical agents, which may have been even ignited under the enormous pressure of miles of ocean, we may suppose chemical depositions to have proceeded contem poraneously or in succession ; confusedly, as in granite, or in lay ers, as in gneiss and mica slate ; and the imbedded minerals of the primary rocks, the garnets, the staurotides, the tourmalins, the beryls, and others, whose elements were present, crystallized by their affinities, forming first the integrant atoms, whose pro gressive aggregation produced the beautiful crystalline solids, that in a peculiar manner adorn the early formations of the globe. Water and fire and pressure, and all the great chemical agents, may thus have conspired, in acccordance with physical laws, in effecting the arrangement of the crust of the planet. Violent movements were the natural result of this state of things. Igneous agency, the parent of earthquakes, acting beneath the rocks already formed, and beneath the incumbent ocean, would of course produce fractures, dislocations and distortions, tortuous flex ions, injections of veins and dykes, heavings, subsidence and ele vation of strata, called faults by the miners, and innumerable ir regularities. In the same manner many of the trap rocks were probably thrown up beneath the primeval ocean ; they broke through the strata and congealed above or between or among them, in ridges, peaks or flats ; or they were injected in dykes or veins, or driven, laterally, between the strata, rending them asunder, as if cleft by 34 wedges. When, after the emergence of land, they burst out be neath the atmosphere, they formed true volcanoes. Inference. — While, by a vast accumulation of evidence, the claims of heat have been greatly and justly enlarged, and as re gards the great mass of the globe, fusion has, by rightful au thority, been substituted for solution, Vulcan has thus triumphed over Neptune ; but the latter still enjoys no mean dominion, either in extent or in power. It is indeed impossible to explain geological phenomena without having recourse to both these mighty agents, the one ruling the immense interior kingdom, the other the external, through whose superficial territories the restless monarch of fire makes occasional and violent eruptions, establishing often only a transient sway, and after menacing uni versal destruction, retreating again to his hot domain, leaving mere ly the vestiges of his destructive aggression. At other times and places the irruption is sustained ; age after age, subterranean thun der and agitations celebrate the victory, and a burning signal- light is hung out against the skies, the emblem of conquest by fire. While we have vindicated the too much neglected effects of water and aqueous solutions in softening, modifying, or dissolv ing mineral bodies, we are fjee to confess that the solution of the entire planet, or even of its crust, in water or in any other existing solvent, is a supposition which no well instructed person would now venture to make. Sustained by the paramount authority of Werner, it was long a received doctrine of the geological schools, and it is perhaps not surprising, that his prevailing eloquence and the zeal of his numerous disciples, trained under the very sound of his voice, should have given extensive currency to this theory. Those who have been among the last to retreat from this un tenable ground, have however no cause for mortification, since the converts to the Wernerian theory may find enrolled in their catalogue names of the greatest celebrity for talent, attainments, and moral excellence. This theory, as a whole, is now for the most valid reasons abandoned ; still some important members of it will be always retained, and Werner, clarum et venerabile no men, will be ever honored and revered. XII. First condition of the Materials of the Globe. — Both geology and revelation are silent with respect to the first 35 condition of the materials of our planet, nor is it possible for us to decide the question how they first appeared. There is how ever no reason to suppose, that we see any thing as it was origin ally created. We are certain of this in relation to the rocks containing organized beings and fragments, whether the latter were charged with organized relics or not. This statement in cludes all formations except the primary or crystallized and ig neous. Reasoning from the natural products of volcanoes, and upon the laws of crystallization, as applied to crystalline masses,- as well as to individual crystals, no geologist hesitates to infer, that the crystallized and unstratified rocks have assumed their present appearances from the operation of natural laws, and con sequently that -the globe, as far as we can examine it, or infer its condition at profound depths, has been wrought over, and much of it again and again. Consequently, we cannot be certain that in this sense even granite is strictly primitive ; but in relation to subsequent formations, it may be primary or anterior to them ; as an igneous rock, it may have been melted in all geological ages, and consequently some of its injections and overflows may have been more recent than the newest secondary rocks, for it has been found penetrating and overlying chalk. This appears to be the most recent geological date which it has been proved to have attained. Still, it would not be surprising if it were found to invade and cover even the tertiary ; we ought to be prepared for such discoveries, nor would they, if made, militate with our pres ent views of geological dynamics. Farther than this we are hardly prepared to go, for if that which is granite below were to be erupted above, under only atmospheric pressure, it would assume some of the known forms of lava, and if ejected under the sea, it might take on the character of the traps or por phyries. In all vicissitudes of geological theory, it must ever remain true, that the materials of granite, considered as a whole, have always been below all- other existing rocks, and consequently that they are prior in order of position, although their form of existence is not strictly primitive, nor can any thing among rocks be fully proved to be entitled to that name. Mr. Lyell's name of hypogene implies formed beneath, which is in accordance with the ideas expressed above. 36 XIII. Possible modes and results of elementary action. — In the present state of chemical science, our elementary ponder able bodies are divided between combustibles, (metallic and non-metallic,) and supporters of combustion — of the former fifty, of the latter five ; and if we extend the idea of combustion, as some authors are disposed to do, to other cases of intense chem ical action, attended by the extrication of light and heat, we shall include the agency of the combustibles and metals upon each other, as well as upon the proper supporters of combustion, and also the action of the latter upon one another. For our present purpose, it is quite immaterial which view is embraced. If we suppose that the first condition of the created elements of our planet, was in a state of freedom, and the globe being a mass of uncombined combustibles and metals, that oxygen, chlo rine, iodine, bromine, and fluorine were added, it is obvious, that the reaction, awakening energies before dormant, would produce a general and intense ignition and combustion. Phosphorus, po tassium and sodium would instantly blaze ; the other combusti bles and metals would follow in the order of their inflammability, and thus a general conflagration would be the very first step in chemical action. Water would be formed, the atmosphere would result from the mixture of its elements, the fixed and volatile alkar lies, the earths, and stones, and rocks, the metallic oxides properly so called, the sulphurets and phosphurets, &c. of the metals and of the combustibles, the principal acids, the iodides, bromides, fluo rides, and chlorides, alkaline, earthy and metallic, and ultimately the salts, besides many other compounds resulting either from a primary or secondary action, would be produced. In such circumstances, the imponderable agents, heat, light, electricity, magnetism, and other forms of attraction, would be inconceivably active — steam, vapors and gases would be suddenly evolved in vast quantities, and with explosive force ; and the re cently oxidated crust of the earth would be torn with violence. It is however obvious, that this intense action would set bounds to itself ; for the chemical combinations would relent or cease, when the crust had become sufficiently thick and firm to protect the metals and combustibles beneath from the water and the air, and other active agents. 37 As we are merely stating the conditions of a problem, we for bear to descant upon collateral topics, or to pursue the primary rock formations through all their vicissitudes. We do not even aver that such events have actually happened ; but philosophy is sober and rational when it assumes that their existence is consis tent with the known properties of the chemical elements, and with the operation of physical laws. Supposing that such was the actual beginning and progress of things, it is obvious that the oxidated crust of the globe, would still cover a nucleus consisting of metallic and inflammable matter. Of course, whenever air and water, or saline and acid fluids penetrated to this internal maga zine, the same violent action would recur at increasing depths, and the confinement and pressure of the incumbent strata, aug menting the effects a thousand fold, would in later ages, necessa rily produce the phenomena of earthquakes and volcanoes. Still, it is equally obvious, that every recurrence of such events, provided no cause of renewal can be indicated, must oxidize the earth deeper and deeper, and if the point should ever be attained, when water or air ceased to reach the inflammable nucleus, or if it were all oxidized, the phenomena must cease, and every ap proximation towards this-point would render them less frequent. Does this correspond with the actual history of the globe ? Are ignition and convulsions less frequent now than in the early ages of our planet ? The extensive regions, occupied by rocks of acknowledged igneous origin, but where fire is not now active, lend support to this hypothesis, which well accords with the views now generally adopted of the formation of granite. This hypothesis is perfectly consistent with the opinion that those gal vanic powers which we know to exist — whose action we can command, and whose effects, having been first observed within the memory of the present generation, now fill us with astonish ment, are constantly active in producing and renewing the phe nomena of earthquakes and volcanoes, as both at earlier and later periods, they have been equally efficient in melting granite itself. Metals and chemical fluids, with juxtaposition, in a certain order, are the common means by which we evolve this wonderful power. Even substances apparently dry and inert, will produce a permanent, and in proportion to the means employed, an energetic 6 38 effect, as in the columns of De Luc and Zamboni. Metals and fluids are not indispensable, for almost any substances of different natures properly arranged, will cause the evolution of this power. Whoever has witnessed the overwhelming brilliancy and intense energy of the great galvanic combinations of Davy, Children, and Hare, and considers how trifling in extent are our largest batte ries, compared with the vast natural arrangements of earths, salts, metals and fluids, which exist beneath our feet, will not be slow to admit that this power may in the deep interior be incessantly and alternately evolved, mitigated, suppressed, revived, and aug mented to tremendous intensity. In our instruments, we see emanating from this source intense light, irresistible heat, magnetism in great efficiency, and a de composing agency, which, by direct or intermediate action, com mands all elements, and all combinations. The experience of a few years has added magnetism as a power at once the effect and the cause of electricity. The latter, especially in the galvanic form, evolves immense magnetic energy, and magnets in turn give out electricity and produce all the effects of electrical and galvanic combinations — heat, light, or sparks and ignition, shocks, decomposition, and, by induction, even magnetism itself. We have stated an hypothesis as to the condition of the ele ments when they were first created. We would not insist upon this, because we cannot know it to be true. But in assigning galvanic action as a cause of the internal heat of the earth, we propose a reasonable theory, and we provide not only for heat independently of combustion, but we may in this manner provide combustibles which may act chemically, and thus add to the effect without limit. The decomposition of acids, alkalies, earths, and other metallic oxides, is a familiar effect of galvanic action ; their metals and combustibles are set at liberty, and some of them being inflammable both in air and water, elastic agents may be evolved, and being rarefied by heat, would produce violent me chanical action. The first principles of this hypothesis are estab lished by experiment, and nothing is really hypothetical but the application to the phenomena of internal heat and of earthquakes and volcanoes. 39 It is a peculiarity of the present view, that causes are provided which admit of indefinite continuance, and of unlimited renova tion, and there appears no reason why the phenomena should ever cease. It has therefore the great Newtonian requisites of a good theory : its facts are proved, and the theory is both true and sufficient. In its application to volcanoes, it has this additional advantage, it embraces all that is possible in other theories. Coal, lignite, sulphur, petroleum, hydrogen gas, and fermenting pyrites, may all contribute their quota of power to the production of vol canoes, although the united effect of all these must, if it be ope rative at all, be very trivial. Heat, light, electricity, and magne tism, may produce endless decompositions and recompositions ; burnt substances by galvanie energy returning again to their combustible condition, will burn anew; elastic fluids will be evolved in unlimited quantities, and all the violent mechanical effects which their action is known to produce will succeed ; these are among the known and familiar effects of this power, and all the materials necessary to render it active are existing in the earth on a scale of immense extent. The present hypothesis does not exclude the subsequent action of water, in dissolving chemically, or disintegrating mechanically, the crust of the globe ; for water, fire, and all the great chemical and mechanical agents mutually cooperate. The cause now indicated is sufficient for all the phenomena, and this cannot be said of any other that has been, or, in the pres ent state of our knowledge, can be named. We may venture a step farther ; it is certainly possible, — perhaps it is not improba ble, that the light and heat of the sun and of the fixed stars may have a similar origin. To the eye of philosophy, as well as to vulgar apprehension, the sun is an ignited body, and we know not of any power but the electrical that can perpetuate this con dition. It is not necessary to speculate as to the mode of excite ment, but we may remark, that fluids are not indispensable ; the power may be evolved from dry substances, and even between good conductors, if heat be applied in the beginning ; electricity may produce heat, and heat may excite electricity, and both have the most intimate and reciprocal relations to magnetism. Thus a circle of agencies is provided which being mutually causes and 40 effects may continue to operate in an endless cycle whose ter mination will not be fixed by the exhaustion of phyical power, which never tires nor grows old, and will cease to act only when the Creator shall fix its limit and annul the fiat that called it into being. XTV. Relation of Geology to the early Scripture His tory. — In this country, the cultivation of scientific geology is of so recent a date, that many of our most intelligent and well edu cated people are strangers even to its elements ; are unacquainted with its amazing store of facts, and are startled, when any other geological epochs are spoken of than the creation and the deluge. But, it is beyond a doubt, that there are innumerable and decisive proofs of successive revolutions, and of a gradual progress in the course of geological events, implying, on the whole, a regular order in the formation of the crust of the planet, which events necessarily imply much time, and cannot be referred, exclusively, to any course of diluvial action. It is impossible, to refer to this cause, rocks containing consolidated water-worn ruins and frag ments, and organized remains, entombed in the firm strata and mountains. The fossil organic kingdom presents a vast field of observation and instruction, and it is less known, even to the greater number of intellectual persons, than almost any depart ment of knowledge. None but geologists study it with diligence, and none who have not made themselves masters of the facts, are qualified to judge of their importance, and of their bearing. To understand the subject, we must study -in the fields, in the mines and mountains, or, as an imperfect substitute, in the cabinet. Persons who are entirely ignorant of this species of information, are destitute of the means of forming a correct judgment, they neither know the facts, nor can they compare one truth in geol ogy with another, so as to estimate their mutual relation. On this subject, it is, therefore, very difficult to find access, to many minds, otherwise enlightened, and habituated to receive and weigh evidence, with candor and intelligence. The obvious reason is, that they are not in possession of the first elementary conceptions ; and when the facts are stated, if they are not de nied, they are neglected, because they are inconsistent with their habits of thought, and because they make no distinct impression, 41 they are supposed to be dreams or pictures of the imagination ; thus they fail to bring that conviction to the mind, which must always be the result, when they are fully understood and realized. In this country, where the moral feeling of the people is iden tified with reverence for the Scriptures, the questions are often agitated by intelligent persons, — When did the great series of geological events happen ? If the six days of the creation were insufficient in time, and the facts cannot all be referred to the del uge of Noah, to what period, and to what state of things shall we assign them? This is a fair topic of enquiry, and demands a satisfactory an swer ; an answer, which is given by the whole series of geologi cal discoveries, and the question will never remain of doubtful issue in the mind of any one who has fully studied and mastered them : but they must be studied profoundly and not superficially. The subject of geology is possessed of such high interest, that it will not be permitted to slumber ; it will proceed with increasing energy and success ; a great number of powerful minds and im mense research are now employed upon it, and many collateral branches of science are made tributary to its progress. Its con clusions have been supposed to jar with the Scripture history ; this is contemplated with alarm by many — with displeasure by some, and possibly, by a few with satisfaction ; but there is no cause for either state of feeling : the supposed disagreement is not real ; it is only apparent. It is founded upon the popular mistake, that since the creation, the deluge and volcanic eruptions, with the convul sions of earthquakes, are the only causes that have produced impor-* tant geological changes ; they believe that this world was formed substantially as we now see it, and if they have any knowledge of its immense and various deposits, they suppose that they were made ih a very short period of time. Both these are fundamen tal errors, which have misled both the learned and the unlearned, and they are still extensively prevalent. Although the materials were created by almighty power, they were evidently left to the operation of physical laws, which laws also affected, more or less, the fate of the various races of plants and animals that were successively called into existence. But as already remarked, there is no reason to believe, that any part of 42 the crust of the earth, reaching even to a fathomless depth, is now in the condition in which it was originally made ; every portion has been wrought over and brought into new forms, and these changes have arisen from the action of those physical laws which the Creator established, and which are as truly his work, as "the materials upon which they operate. The amount of time is the only difficulty, and this will vanish before an enlarged and rea sonable view of the whole subject, comprehending also a just estimate of the evidence. Nature of the evidence. — The evidence is the same which is readily admitted as satisfactory in the case of historical antiquities. Roman coins, weapons, personal ornaments, utensils, baths, roads, camps and military walls, and defences of various kinds, have been frequently discovered in Britain. They are ascertained to be Roman, by their resemblance to, or identity with, the ac knowledged productions of that remarkable people, as still existing in Italy and the adjacent countries, the ancient seat of their do minion. Had Julius Cesar and the other historians and writers been silent as to the invasion of Britain, and as to the dominion, which, for more than four centuries the Romans sustained in that island ; still, could any one, acquainted with the facts, hesitate to believe, that they had not only visited Britain, but also remained there, for a great length of time, as conquerors and masters. Had all historical knowledge of these events been lost, would not the antiquary who examined the relics, and who also extended his observations to other countries where similar things are found, with perhaps the addition of splendid aqueducts, temples, and amphitheatres, pronounce that they had all evidently originated from one and the same people, and would he not, without hesi tation, pronounce them to have been highly civilized, warlike and powerful ; and that their epoch was one of considerable an tiquity. At this moment, there exist in some parts of England, and in various parts of Europe and Asia, ancient barrows or sepulchral mounds, some of them of stupendous size ; similar structures are found in North America, and also stupendous forts, which, in Ohio and Kentucky, and other western states, amaze and con found the observer.' 43 These structures enable us to realize the supposition just made respecting the Romans, and compel us to say, that all these massy mounds and forts, were the work of unknown races of men, on whose history even tradition sheds not a ray of light, and we are left in profound ignorance, as to their origin. In relation to geology, it is easy to make the case still stronger. When, in 1738, the workmen, in excavating a well,* struck upon the theatre of Herculaneum, which had reposed, for more than six teen centuries, beneath the lava of Vesuvius ; when, subsequently, (1748,) Pompeii was disencumbered of its volcanic ashes and cinders, and thus two cities were brought to light ; had history been quite silent respecting their existence, as it was respecting their destruction ;f would not all observers say, and have not all actually said, — here are the works of man, his temples, his forums, his amphitheatres, his tombs, his shops of traffic and of arts, his houses, furniture, pictures, and personal ornaments, his streets, with their pavements and wheel-marks, worn in the solid stone, his coins, his grinding mills, his wine, food, and medicines, his dungeons, and stocks, with the skeletons of the prisoners chained in their awful solitudes, and here and there the bones of a victim, who, although at liberty, was overtaken by the fiery storm, while others were quietly buried in their domestic retreats ; the falling cinders and ashes even copied, as they fell, the delicate outline of female forms, and having concreted, they thus remain true vol canic casts to be seen by remote generations. Because the soil had formed, and grass and trees had grown, and successive generations of men had unconsciously walked, tilled the ground, or built their houses, over the entombed cities ; and because they were covered by lava or cinders, does any one hesitate to admit, that they were once real cities, that at the time of their destruction they stood upon what was then the upper surface, that their streets once rang with the noise of business, their halls and theatres with the voice of pleasure : that, in an evil hour, they were overwhelmed by a volcanic tempest from * Earlier excavations had been made and three female statues discovered. t In the histories of those times, it is only said, in general terms, lhat cities and villages were overwhelmed. 41 Vesuvius, and their name and place, for almost seventeen centu ries, blotted out from the earth and forgotten. The tragical story is legibly perused by every observer, and all alike, whether learned or unlearned, agree in the conclusions to be drawn. When moreover, the traveller of the present day sees 'the cracks in the walls of the houses of Pompeii, and observes that some of them have been thrown out of the perpendicular, and have been repaired, and shored up, he learns that the fatal convulsion was not the first, and that the doomed cities, must have been before shaken on their foundations, by the throes of the laboring earth. To establish all this, it is of no decisive importance that schol ars have gleaned, here and there, a fragment from ancient Roman classics, to show that such cities once existed ; and that they were overthrown by the eruption of the year 79 of the Christian era, which gave occasion for the interesting letter of the younger Pliny, describing the death of his uncle, while observing the vol canic phenomena, his philosophical curiosity having cost him his life. In such cases, the coincidences of historical and other wri tings, and the gleanings of tradition, are indeed valuable and grati fying ; they are even of great utility, not in proving the events, for of them there is a record, which cannot deceive, but in fixing the order, and the time of the occurrences. The nature of the catastrophe, which buried the devoted cities, is however perfectly intelligible, from the appearances themselves, and needs no histor ical confirmation. No man ever imagined that Herculaneum and Pompeii, were created where we now find their ruins ; no one hazards the absurd conjecture that they are a lusus naturae, but all unite in giving an explanation consistent alike with geology, history, and common sense. Application of the Evidence. — In the same manner then, we reason respecting the physical phenomena of our planet, and here, even at the hazard of some repetition, we shall make a statement of facts, to illustrate this most important argument, which will demonstrate that geological evidence is of the same nature with that just cited, and that the most revered documents cannot be more decisive in relation to civil history, than geological facts are with reference to the natural history of the earth. 45 The earth then is full of crystals and crystallized rocks ; it is replete with the entombed remains of animals and vegetables, from entire trees to lichens, fuci and ferns — from coal beds to mere impressions of plants ; it is stored with animals, from the minutest shell fish, and microscopic animalculae, to gigantic rep tiles ; it is chequered with fragments, from fine sand to enormous blocks of stone ; it shews on the joining surfaces of many strata, and especially of the sandstones, the delicate flexions, produced by undulating water, when the materials were loose as they are now on the sea-shore ; it exhibits in the materials of its solid strata, every degree of attrition, from the slightest abrasion of a sharp edge or angle, to the perfect rounding which produces globes and spheroidal forms of exquisite finish ; it abounds with dislo cations and fractures ; with injections and fillings up of fissures with foreign rocky matter ; with elevations and depressions of strata, in every position, from horizontal to vertical ; it is covered with the wreck and ruins of its upper surface ; and finally, its ancient fires, sometimes for variable periods, partially dormant and relenting, have never been extinguished, but still struggle for exit, through more than three hundred volcanic mouths. The present crust is therefore only the result of the conflicting energies of physical forces, governed by fixed laws ; its changes began, from the dawn of the creation, and they will not cease till its materials and its natural powers are annihilated. Instances. — They are innumerable, and are every where at hand; every system of geology unfolds them; our author's pre ceding volume is rich in such Tacts, and it remains only to illus trate our position by a few examples, duly connected, to sustain the argument, for which purpose they are added. Fossil Fish of Mount Bolca. — The beautiful fossil fish,* more than 100 species of which are found in marly limestone, in Mount Bolca, near Verona in Italy, inform us that they were once living and active beings ; before those hills were deposited, and when the waters stood over the place where, in the bottom of the sea, the fish were entombed, the rock which contains their skeletons "* Already cited in the general sketch ; from this celebrated locality there are splendid specimens in the cabinet of Yale College. 7 46 was formed around them, doubtless in the state of a calcareous and argillaceous sediment ; this calcareous stratum (perhaps itself thrown up by a volcanic heave, and thus suddenly enclosing the fishes) was then overwhelmed by a submarine eruption of molten rock, and the heat was not communicated through the bad con ducting substance of the marl, to the destruction of the organic forms ; then again, and still on the bottom of the sea, the calca reous rock was formed anew with its enclosed fish ; again the molten rock flowed over the calcareous marl, and so on in several successions. But this is not all ; this remarkable formation is now 50 miles from the Adriatic, the nearest sea, and it rises 1200 feet above it. It is plain then, not only that the whole was suc cessively formed beneath the ocean, but that the hill, with the country to which it belongs, was afterwards raised by the power of subterranean heat, thus emerging from the surrounding waters, and ages since becoming dry land. To illustrate this case, we will state that in the waters of the harbor of Newport, in Rhode Island, there are one hundred and thirty or more species of indigenous fishes ;* now suppose an irrup tion, as from land torrents or a volcanic movement under the waters, were to throw suddenly upon them, such a mass of sedi mentary mud, that they were to become entangled and suffocated on the spot; they would of course remain, and the materials might, by pressure and time, become consolidated around them. Were the bottom of the sea to be afterwards elevated into dry land, on opening the bed, there would be found a true Bolca quarry of fossil fish. Excepting the overflow of igneous rock and the repetition of the fish deposit, and of the fire rock, the cases appear exactly alike. The Bolca fish present only one example among thousands in Italy and Sicily, of the emergence of mountain ranges, whose flanks for a thousand feet or more in height, as on the Apennines, or two thousand as in Sicily, are replete with the shell fish and other molluscous animals of the Mediterranean. Organic Remains hi Early Rocks. — In very early, and often deeply seated rocks, usually called the transition, coming imme- * As ascertained, from the fishermen, at the instance of the late President Dwight, by my brother Gold S. Silliman, then a citizen of Newport. 47 diately after the primary, we find the first traces of organized beings ; the perfect impresses of plants, with the earliest coal, and both the forms and the entire mineralized bodies of millions of animals ; the deposition of these rocks was therefore cotempo- rary with, or subsequent to, the creation and propagation of the organized beings whose impresses or whose forms they contain, and it is self-evident, that these rocks could not have been depos ited prior to the date of the animals and vegetables included in them. In many cases both the plants and animals lived and died at or near the places where they are found entombed in the rocks ; for often they present few or no marks of violence, or of accident ; their delicate parts are often perfectly preserved ; animals, with their organs entire, and plants with their fibres and leaves in full expansion. Occasionally, however, we find one stratum with its included mineralized organic bodies entire, and a contiguous one having them more or less broken, mutilated and dispersed. It is there fore evident, that in early ages, as now, organic relics were trans ported and broken by currents and other aqueous movements, and by atmospheric agitations, and that perfect repose was only occasional and existed in peculiar circumstances, while between the extremes of great movements and entire quiet, there were, as at the present time, many intermediate stages. Both the plants and animals belong to races which are no longer found alive, or if analogous races exist, they are related to the ancient ones only by class or genus, and not by species. Ortho- ceras and trilobites are found among the most ancient animals, and zoophytes, shell fish, and other molluscs are common. Mad repores and crinoidea abound in the early rocks. Sometimes, strata rich in entombed animals, occupy great districts of country. In the transition marble for instance, animals reposing in the bowels of mountains, miles from day-light, often form almost the entire mass, and they are so firmly united to the rock, as to constitute a part of its substance. Many of the architectural marbles owe much of their beauty to imbedded animals, myriads of which lie almost in absolute contact ; the matter of the rock between them, only fill ing up the void occasioned by their angular and confused positions. 48 The trilobites had a jointed articulation, could bend their bodies like a lobster, and we find them sometimes doubled, and sometimes expanded, as they lie in the rocks. Dr. Buckland has shewn that the eye of this animal was furnished with 400 lenses, adapted to a wide range of vision in clear water, and consequently it was not fitted to live in the turbid ocean formerly supposed to belong to this geological period — the imaginary chaos. Dr. Buckland's Bridgewater Treatise is a classic on organic remains, and no one having the knowledge and giving the attention necessary to com prehend his fine course of illustration and argument, can fail to find in his book a moral and physical demonstration of the high est order ; physical, as proving the progressive formation of the crust of the earth through a long course of ages, and moral, as evincing the wise and benevolent design which is irresistibly in ferred from the work of progressive creation and arrangement. We have already mentioned the fossil fishes below the coal, and in the deep transition rocks still lower down. The former opinion that the early animals were exclusively very simple in their structure, appears therefore, no longer tenable. Still it is true, that as the creation advanced, higher orders of both animals and plants were called into being, while animals of simple struc ture are also continued to the present time. Possible Mode of Consolidation. — There is little difficulty in understanding how the marine animals — for example, the crinoidea and corals that fill, more or less, the transition limestone of the Peak of Derbyshire, and the limestone of many portions of the West in the United States, came to be thus entombed. We can not doubt that the animals received their existence, and lived and died in the ocean, and that, at least at the time of their death, it was full of calcareous carbonate, either in solution or in mechanical suspension, or both. When they died, they of course subsided to the bottom, and were surrounded, as they lay, by the concreting calcareous matter. Multitudes of them were present, at the same time and place, in all the confusion of accidental position, and therefore were enveloped, just as we find them, in every imagin able posture ; the interstices were filled by the lime, and this be ing more or less chemically dissolved, produced a firm sub-crys talline mass, a section of which shews us the animals sawn through, and admitting of a polish, like the rest of the rock. 49 If we could suppose that our common clams and oysters, that lie in the mud of our harbors and inlets, were to become solidi fied into one mass, along with the matter which envelopes them, the case would not be dissimilar ; only they would be enveloped in earthy, instead of crystalline matter, and the rock formed from it would be referred to the most recent secondary, or to the ter tiary, unless its texture were afterwards altered by igneous agen cies, by infiltration of dissolved matter, or other causes, and even then, its geological age would be decided rather by its organic remains, than by its mineral texture. It is easily understood, also, how a new stratum, either of the same or of different constitution, may be deposited upon a pre vious one, and with it, the bodies of the animals that lived and died in the fluid, by wliich it was covered ; and these might be the same animals with those of a previous stratum, or of a dif ferent order, it being understood that, in the case of marine ani mals, each successive stratum was, in its turn, the bottom of the existing ocean, and also the upper or last consolidated layer of the crust of the earth, as it then was at that place. A similar course of reasoning will apply to fresh-water deposits. With respect to marine and aquatic animals, the temperature, and perhaps the mineral contents of the waters, appear to have been, at different periods, adapted to the support of different races, which were therefore called into existence, and thus, when they died, their remains became successively solidified. There was not, however, an entire extinction of all the ani mals of a particular race ; a multitude were entombed, as is proved by their remains, but the species often survived to another epoch or to other epochs, sometimes through a cycle of changes ; in the mean time, new races were created and became petrified in the forming rocks : again perhaps, the diminished race peopled the waters anew, and their relics were solidified in another de position, and so on in succession. Whether animals and vegetables were deposited in the ocean, or in seas, in lakes, rivers or estuaries, it is easy to imagine, that if all the causes necessary to produce the events were to be brought into successive operation, they might follow each other in the order supposed ; and that this was the fact, cannot be rea sonably doubted, any more than that an edifice, having granite 50 for its foundation, sandstone for its basement, marble for its su perstructure, wood for its roof, and lead, zinc or iron for its cov ering, was actually constructed by the architect, and connected in that order by his intelligent design. The great truths of geology are few, simple and intelligible ; needing nothing but the application of a sound judgment, en lightened by science, to the accurate observation of facts ; the order of their succession can be often ascertained, and not un frequently the proximate causes and the immediate circumstances can be discovered and satisfactorily explained. It. is a supposition, altogether inadmissible, and unworthy of a serious answer, that the animal and vegetable races, entombed in such profusion, and buried often under entire mountain ranges, or firmly cemented into their very bosom, were created as we find them; and still more preposterous is the suggestion sometimes made, by those ignorant of geology, that there are no real organic relics, but only illusory resemblances to animals and plants. Both suggestions are absurd, and evince only profound ignorance. To any person well informed in geology, it is quite superfluous to as sert that organic relics were once living beings, performing the part belonging to their respective races, and that at their death, or soon after, they were consolidated, in the then concreting and forming rocky strata, or that they were, in various instances, overwhelmed by igneous or diluvial catastrophes. Animal Remains in Secondary and other Rocks. — The older secondary rocks often abound in shells of molluscous animals, principally of extinct genera, and there is a progression through the more recent strata, exhibiting a greater and greater approxi mation towards the more complicated structure of the most per fect animals ; while the newer rocks of this class, and of the strata that lie upon them, including the tertiary, contain reptiles, fish, and even birds, and terrestrial quadrupeds. Saurians and Lizards. — The extinct saurians or lizards, men tioned already in our general sketch, appear to have been mainly coeval with the period between the coal and the chalk, or the early tertiary. They were the most conspicuous animals of that time, and were evidently very numerous. Several genera, inclu ding many species, and a great number of individuals, have been discovered, and among them are the most colossal bones that have 51 hitherto been found, anterior to the middle tertiary, or perhaps to any periods. These ancient saurian families, namely, the crocodiles, the ichthyosauri or fish lizards, the megalosauri or great lizards, the plesiosauri or animals resembling lizards, and several more, have been found in the middle and recent secondary tertiary rocks, especially of England and France, and some of them have been discovered in' this country. The megalosaurus is found in limestones and sandstones lying higher than the lias, and the ichthyosaurus and plesiosaurus, in many of the strata above, and in some of those below that rock. The fossil crocodile appears to have been, anciently, as at pre sent, an inhabitant of fresh water, and of rivers. In the West Indies, according to De la Beche, the crocodiles frequent muddy, and sometimes brackish ponds ; and in shallows, they often re main for hours, with the tips of their noses out of water. The crocodile has been continued, perhaps, from the new red sand stone — certainly from the lias, to the present time — and as its re mains often occur in the interval, it appears to have been a toler ably constant inhabitant of our globe. The organization and habits of crocodiles do not enable them to contend with the agitations of the sea, which they shun. It would seem, however, that the organization of the ichthyosauri, and perhaps of the plesiosauri, would enable them to swim in the waves. With the solitary exception of two species of the opossum, found in the Stonesfield slate near Oxford, England, no viviparous ver- tebrated animal has been found below the chalk. The Stones- field slate belongs to the older rocks of the oolitic series, and lies above the lias. The remains of the saurians indicate animals of various size, from a yard or two to twenty, forty, fifty, and seventy feet or more in length. Being generally amphibious, there is every rea son to believe, that when only portions of England, in the form of islands, stood above the water, these animals swam and sported about in the interlocking waters of early Britain, or basked upon the beaches of -its seas and estuaries, while the terrestrial lizards, some of which were of gigantic dimensions, either preyed on other animals, or cropped the exuberant tropical vegetation of 52 a glowing climate, that flourished either on the dry land or along* the fenny and sedgy shores. The iguanodon, (so called from the resemblance of his teeth and form to those ofthe iguana of the West Indies,) was an her bivorous reptile, and appears to have attained the length of sev enty or eighty feet or more, with a height of nine or ten feet. Still, his remains are interred in solid ferruginous sandstone, far below the chalk, and probably more than two thousand feet be neath the upper strata of chalk and tertiary, that were subse quently formed over him, most of which have been swept away by diluvial action or by other causes. In July, 1832, another saurian was discovered in the sandstone of Tilgate Forest* It is described and figured by Dr. Mantell in the Geology of the South East of England. The reptile is named the hylceosaurus, or Wealden lizard. Vertebras, ribs, co- racoids, and other bones were found, either in connexion or in juxta position, making an imposing mass, and very firmly ce mented in the sandstone. The animal is supposed to have been twenty five feet long. The vegetable remains, as well as the fishes and shells, and rolled stones, that are found entombed in the same strata, prove that they were once the upper surface, and formed part of a vast estuary, which was subsequently buried by the marine formation of the chalk and its attendant strata. Early Animals, Vegetables, and Coal. — Among the primary rocks there are no traces of vegetation any more than of animal life. According to De la Beche, wood and terrestrial plants are found in most rocks, not only from the old red sandstone upwards, but in the transition beneath ; proving, that dry land must have existed, more or less, previous to, or at the time of the formation of most of these rocks. We may suppose, therefore, that ponds, lakes and rivers, existed also. It would appear, from the relics of the periods immediately suc ceeding the transition rocks, that vegetation had increased prodi giously upon the earth, and that there were even trees and for ests upon those parts of the surface that had become sufficiently dry. * Subsequently at a later geological period, that of the green sand beneath the chalk at Maidstone. 513 i Bituminous coal was formed from submerged and inhumed vegetables, among which, cryptogamous plants, whose vestiges cire numerous in the coal mines, were conspicuous. Coal, with all its alternating and attendant strata of shales, sandstones, limestones, clays, iron ores, puddingstones, &c, is often found repeated several times in the same coal basin or coal field ; in extreme cases fifty, sixty, or seventy times or more ; and the mines are occasionally worked to a great depth, (even to a thousand feet in some places in England.) It is plain, therefore, that no sudden and transient event, like a deluge, could have produced such deposits, although it might bury wood and trees, which, in the course of time, might approximate to the condition of lignite or bituminized, or partially mineralized wood, which is often found under circumstances indicating a diluvial origin. Two very interesting facts have been recently observed in this country, illustrating the origin of coal from vegetables. Peat has been found in Maine, converted into coal ; large trees have been discovered buried beneath the alluvial sand and clay of the Mississippi ; some of them retain the marks of the axe, but are changed in part into coal, and still present perfect wood in parts of the same log. — Amer. Journal, Vol. xxxv, Dr. C. T. Jackson — Prof. Carpenter. Arborescent plants, and their branches and roots, are often found in the coal formations, and in their sandstones, &c, thus proving that the gigantic vegetables were sometimes embraced in those deposits. Early existence of Trees. — It had been supposed, that the plants which have contributed to the formation of coal were gen erally succulent, with little or no firm woody fibre. It appears, however, from two memoirs by H. Witham, Esq., of Edinburgh, that large trees, strongly resembling the Norway fir and the yew tree, existed, even anterior to the deposition of the great bitumi nous coal field of the Lothians, around Edinburgh. Near that city, in 1826, a fossil tree was discovered, three feet in diameter at its base and thirty six feet long, lying nearly horizontally be tween the strata of sandstone. Its composition was carbonate of lime 60, oxide of iron 18, carbon 9, alumina 10. 8 54 In the quarry of Craigleith, near Edinburgh, another fossil tree has been recently uncovered, whose geological position is in the mountain limestone, and considerably below the great coal basin of the Lothians. Its elevation is, seventy five feet above the level of the sea, and its roots were in the bottom of the quarry. The length of the stem was forty seven feet — a large branchless trunk, — in some parts much flattened, so as to afford an elliptical section. At the largest place, its diameter was five feet by two, and at the smallest, nineteen inches by sixteen. Its branches, and many feet of its top, are gone ; it was probably sixty feet long, and the incumbent mass of sandstone appears to have been one hundred feet thick ; the bark is converted into coal. The composition of this tree is, carbonate of lime 62, carbonate of iron 33, carbon 5, with the specific gravity 2.87. It was a conifer. In the great coal field of the North, in Britain, fossil plants are usually found lying parallel to the strata, but much broken and compressed, and their parts scattered ; but some vigorous plants, generally Sigillariae, appear to have been so strong as to resist the torrents and to remain in their natural position. It results from Mr. Witham's discoveries, that gymnospermous phanerogamic plants are much more frequent in the coal forma tions than has been imagined, and that proper trees, of true lig neous fibre, and of great size, existed even earlier than the bitu minous coal.* Fossil Forest of Portland. — In quarrying in the oolite lime stone of the island of Portland in the English channel, the work men discovered an ancient soil, which they called the dirt-bed, and it still bears that name, or sometimes dirt and black dirt. It is from twelve to eighteen inches thick, and darkened by lignite. It contains numerous rounded stones from three to nine inches in diameter. In this dirt bed are buried many silicified trunks of coniferous and tropical trees, the latter, palm-like in character, and allied to the Zamia and Cycas. They were evidently fossil ized where they grew, as the stumps of the trees stand erect for a height of from one foot to three, and in a single instance even six, with their roots attached to the soil, and about as near to each other * American Journal, Vol. xxv, p. 109. 55 as in modern forests. The carbonaceous matter is most abundant around the stumps and around the remains of the fossil Cycadeae. The dirt bed contains also prostrate silicified stems of trees, partly buried by the black earth and partly by a calcareo-siliceous slate that covers the dirt bed. Although the fragments of the prostrate trees are rarely more than three or four feet in length, still by uniting many pieces, trunks have been restored to the length of twenty to twenty three feet, or, as Dr. Mantell states, upwards of thirty feet, the stems being imbedded from seventeen to twenty feet, and then forked ; the diameter of these near the root is about one foot, and the de scent of the roots into the subjacent Portland stone, shows that its strata were soft and impressible when these trees grew. The calcareous slate which covers the trees, was deposited with tran quillity, and forms swelling masses over the tops of the stumps. These strata are found elsewhere : at Lullworth cave, in Dorset shire, they are inclined at an angle of 45°, and still sustaining the trees in an inclined position, but at right angles to the strata. From these facts it is inferred that the oolite, full of marine shells, became dry land — its upper surface then became covered by a forest in which grew the tropical plants, the Zamia and Cycas ; that the land, with its forests, sank and was submerged beneath a body of fresh water, which deposited a calcareous sediment, with fluviatile limestones, (the Purbeck beds, ) deposited quietly, as the water was not disturbed. Two other carbonaceous beds have been found below, and one of these containing Cycadeae. Mr. Lyell has summed up these changes thus :* " There must have been first, the sea, in which the corals and shells of the oolite grew ; then land, which supported a vegetable soil with Cycadeae ; then a lake, or estuary, in which fresh-water strata were deposited ; then again land on which other Cycadeae and a forest of dicoty ledonous trees flourished ; then a second submergence under fresh water, in which the Wealden strata were gradually formed ; and finally, in the cretaceous period a return over the same space of the ocean." * Elements, p. 358. 56 Then might be added the tertiary strata, both marine and fresh water, and finally the alluvial and diluvial. To imagine, adds Mr. Lyell, such a series of events, will ap pear visionary and extravagant to some who are not aware that similar changes occur in the ordinary course of nature ; and that large areas near the sea are now subject to be laid dry, and then submerged, after remaining for years covered with houses and trees. More recent Fossil Trees and Plants. — Among the more re cent secondary rocks, vegetables increase in quantity and variety as we approach the tertiary, in which we find inhumed wood in the form of lignite, or bituminized wood, or wood slightly min eralized ; eventually we find wood unchanged, although inhu med, and finally peat and living plants ; and thus we trace the vegetable families, from their commencement on the borders of the primary, quite down to our own times. In the loose sand, gravel, and detritus, we often find trees, at every depth, between the surface of the ground and the fixed rocks below ; the surface is often covered by boulders of travelled stones, and the deposi tion is evidently diluvial. Organized Remains deposited from Water, but not from a Transient Deluge. — It is scarcely possible to doubt, that the pro cess of animal and vegetable decomposition in a mineralized state, described above, was that which really happened. Whatever may have been the operations of fire at preceding or subsequent periods, it is impossible that it should have been concerned in the immediate formation of the mineral strata, which contain numer ous organized remains. Animals or vegetables could never be produced or sustained in the midst of fire ; and indeed, it is quite incredible, that strata, containing their relics, were ever melted ; nor is it easy to imagine, that they could be even softened, in any great degree, without destroying or materially deranging the organized structure. Strata of shale or clay might, indeed, be baked without fusion, so as to assume a stony hardness, and still preserve organic im pressions. Thus we have observed a common hard baked brick, lying in a pavement, bearing a distinct and beautiful impression of a scallop shell, (Pecten;) the shell was gone, being doubtless de stroyed by the fire, while its impress remained. Strata that have 57 been ignited may, therefore, retain the forms of organic bodies, which would of course be destroyed by the heat. This fact is indeed fully illustrated by every ornamental im pression made by a mould or die upon the clay of unbaked pot tery or porcelain ; it remains indelible and unalterable after pass ing through the furnace. It appears evident also, that the mineralized plants and animals of the solid strata have not been collected in these situations by any sudden and local, or even general catastrophe ; for, as an au thor remarks, " among the immense number of fossil shells, many are remarkable for their extreme thinness, delicacy and minute ness of parts, few of which have been injured, but on the con trary they are, in general, most perfectly preserved." Among the plants of the coal formation, situated sometimes hundreds and thousands of feet below the surface, and covered by many beds of solid rocks, their leaves, many of which are of the most tender and delicate structure, are often found fully expanded, in their natural position, in regard to the rest of the plant, and laid out with as much precision as in the hortus siccus of a botanist. It is often true that the minutest parts do not appear to have suf fered attrition or injury of any kind. Fragmentary Rocks. — The rocks composed of fragments and rounded water-worn pebbles afford us the strongest evidence of progressive destruction, deposition and consolidation. Among the transition rocks we find, in general, for the first time, fragments both rounded and angular of all the previous rocks ; sometimes these fragments are united by crystalline mat ter of a different nature, forming the paste or cement which holds them together ; or the paste is composed of nearly or quite the same materials with the fragments, but in a state of much finer division, and at other times there is little interposed matter. Many of the rocks of this class are most palpably fragmentary, the fragments being of all sizes, either scarcely visible to the na ked eye, or several inches or feet in diameter. Instances. — We have seen and carefully examined/in place, all the following instances of fragmentary rocks, namely : — The brecciated marble of the Potomac, employed in the public buildings at Washington ; this is a remarkably firm rock, composed of angu- 58 Iar and ovoidal pebbles, the latter of which have evidently received their shape from friction in water. The cement is a more mi nutely divided substance of the same kind ; but calcareous matter is not exclusively the material either of the pebbles or of the cement. The fragmentary rocks of Rhode Island, extending by Provi dence to Boston, and which are very conspicuous in Dorchester, Roxbury, Brooklyn, and other neighboring towns, are fine exam ples of early formations of this kind. They are very interesting five miles east of Newport, at a place called Purgatory, where a large mass of the rock is separated by the natural seams, that ap pear to have been produced by a subterranean heave. The seams run parallel for a great distance, cutting the pebbles in two, and thus the included mass has fallen out, having been undermined by the sea, whose waves, when impelled by storms, break and roar frightfully in this deep chasm. The pebbles are here chiefly quartz ; they are ovoidal in form and of every size, from that of a bird's egg to that of a barrel, and they lie generally with their transverse diameters parallel. They are frequently invested by numerous crystals of the magnetic ox ide of iron, perhaps sublimed by the heat that elevated the strata. The pebbles of the fragmentary rocks about Boston are very various in their composition, but are obviously the ruins chiefly of primary rocks. The pebbles, which there lie in the roads and fields, have proceeded from the disintegration of this puddingstone. The great sandstone deposit of the valley of the Connecticut presents every variety in the size and form of the parts that have been broken up from previous rocks, transported, more or less rolled, and cemented into rock again. In East Haven, near New Haven, the rocks often contain massy pebbles of granite, gneiss, mica slate and clay slate, and of the individual minerals of which they are composed. Water-worn pebbles are in some places as common in these rocks as on the sea shore : they form mighty strata, which have been tilted out of the horizontal position, into an inclination of 15 or 20 degrees from the horizon ; their successive parallel ridges resemble the waves of the sea, and between them are the long-drawn troughs, extending with great regularity in the direction of the strata. 59 The Catskills, are conspicuous monuments of geological revo lutions, for not only at the base, but at the summit, from two to four thousand feet above the level of the Hudson River, we find them composed extensively of fragmentary rocks, rounded and angular ; their rude piles inform us, that the materials of which they are built were once loose and rolling about, in the waves of an early ocean, encountering friction and violence in their various modes of action, and it admits of not the smallest doubt that these mountains, after consolidation, have been raised from the depths of the sea into their present position — lifted doubt less with the continent of which they form a conspicuous feature. Origin. — We must look for an adequate cause whence arose the mighty masses of ruins of every shape and variety, composing not merely accidental fragments, or here or there a stratum or a hill, but covering myriads of square miles, the foundation of countries, and rising occasionally even into high mountains. Such are the effects and proofs of crystallization, as exhibited in the primary rocks, that the contrast afforded by the fragmentary piles, must appear very striking ; and connected with their rela tive position, can leave no doubt on the mind, that they arose from a subsequent and totally different state of things. What were the causes that broke up portions of the primary rocks and left their ruins the sport of the waves, destined in the progress of time, to be cemented again into firm masses ? Causes which appear very feeble in their action produce, by long continuance, results which we are sometimes inclined to attribute to more violent agents. Such are the wearing effects of the weather and the seasons, and of the vicissitudes of tempera ture, powers constantly in operation, and to these we can add the convulsions of earthquake, tempest, flood, and fire, by which our planet is still as it has ever been agitated. These causes would, in the course of ages, perform the work, great as the results may now appear. The breaking up of primary and other rocks by ordinary causes, as well as by violent convulsioris, and the transportation of their ruins, often to distant places ; the frequently rounded form of the fragments, presenting pebbles of every size, from that of a pea, to that of a hen's egg, a human head, or a barrel — quartz being not 60 unfrequently the material ; the reconsolidation of these masses into firm rocks — their stratification at first horizontal and then rising, at various angles of inclination ; the alternation of such strata with slate and coal and other deposits, their extraneous con tents of innumerable organized beings, and the elevation of the whole, sometimes hundreds or thousands of feet above the ocean level ; all these facts leave not a doubt that the fragmentary rocks required much time for their formation, consolidation and eleva tion, and could never have been the work of a short period, or of a transient deluge. It is evident also, that some of the brecciated rocks were deposited before the granite mountains broke through them, tilted them up, and threw them into positions of high in clination, as may be seen in various places among the Alps. Diluvial Deposits. — As regards the wreck and ruins with which the surface of our planet is every where covered ; their extraor dinary position, and to some extent their production, have been usually, but as is now thought too generally and exclusively, attributed to diluvial agency ; to mighty floods and rushing tor rents of water. Diluvium is found every where. The almost universal depo sits of rolled pebbles, and boulders of rocks, not only on the mar gin of the oceans, seas, lakes, and rivers ; but their existence, often in enormous quantities, in situations quite removed from large waters ; inland, imbedded in high banks, or scattered, occa sionally in profusion, on the face of almost every region, and sometimes on the tops and declivities of mountains, as well as in the valleys between them ; their entire difference, in many cases, from the rocks in the country where they lie — rounded masses, and pebbles of primary rocks, being deposited in secondary and tertiary regions, and vice versa ; these, and a multitude of similar facts, are among the most interesting of geological occurrences. Curvilinear stones may possibly, in given instances, be formed by decomposition of the angular portions, and by various chemical agencies, aiding those of a mechanical nature ; but pebbles present unquestionable evidence of having been brought to their rounded form by friction in water, aided by sand and gravel and by mu tual collision, and they can scarcely be confounded with those produced in any other way. 61 The attrition of the common waters of the earth, within the limited period of our observation, aided by transient and occa sional floods, or even by the deluge described in Genesis, would do very little towards producing so mighty a result ; and we must assign the effects not only to our own times, but to an earlier and much more extended course of mechanical agencies, produced by agitated waters, through successive ages. We must charge to moving waters the undulating appearance of stratified sand and gravel, often observed in every country, and very conspicuously in the plain of New Haven ; in remarkable beauty and delicacy in many places in the valley of the Connecticut Riv er, aud especially at Mink Brook, a mile or two below Dartmouth College ; exhibiting frequently a delicacy of flexion in the layers, which makes them appear as if they had, but a moment before, received their impulse and position from undulating currents, and as if they had copied the very eddies and gyrations of the wave.* Indeed nothing in geology strikes the observer with more in terest, than these beautiful arrangements in strata, of the beds of sand, gravel, clay, loam and pebbles.f A section of a bank of any of these deposits — or better still, an avulsion or fall, which leaves the stratification exposed, without being obscured by the rubbish, produced by digging, or by the sliding of loose sand — never fails to exhibit the effects of sedimentary deposition ; sometimes hori zontal — sometimes inclined at various angles, great or small — sometimes undulatory, and recording, in a language that cannot be misunderstood, the effects of subsiding water. The beds are not always arranged in the order of the magnitude of the parts. Sometimes coarser gravel, or even pebbles, will form a layer above fine sand, and then perhaps the order will be reversed, indicating that there were currents, and these, relenting and increasing alternately, as they were impelled prafcably by tides or storms, so that coarser or finer materials were transported and deposited, as the waters and currents were more or less agitated and rapid. * These strata would perhaps be now arranged with the tertiary. t For our present purpose it is immaterial whether these depositions be referred to tertiary deposits, or to those that are strictly diluvial. 9 62 Bowlder stones, consisting of fragments of primary rocks, pro bably from the regions north of the great lakes, are found abun dantly on the secondary regions of Ohio, New York, and other states ; the fragments of the primary Alps, on the Jura chain, the ruins of the Scandinavian Mountains on the secondary and dilu vial plains of Prussia and Northern Germany, (the Baltic inter vening,) and the fragments of the northern counties of England, cover the southern and middle regions. In many cases bowlders and pebbles can be traced to their na tive beds, and frequently they are strangers to the regions where they are found.* Deserts of sand, covering tracts more or less extensive, such as those in South Africa, in the Zahara, stretching in a vast belt, from the Atlantic ocean to the desert of Lybia ; the sandy plains of Arabia, Germany, and Russia ; the great desert at the foot of the Rocky Mountains, and all similar deposits, in situations where no obvious existing causes could leave them, are usually referred to diluvial agency. It is suggested however by Dr. MacCulloch, that the sands may in various cases have been derived from the decomposition of rocks in situ. Diluvial Torrents — Lakes — Valleys. — That diluvial torrents, especially when aided by convulsions and by ice, have had suffi cient power to roll even bowlder stones and disjointed columns! to great distances, or to precipitate them from their native ledges into the valleys, is sufficiently evident, from what we know of the energy of torrents in our own time. Beds of sand, gravel, clay, loam, pebbles, and bowlders, com pose the loose materials of every country, and they invariably ex hibit the appearance of deposition from water, sometimes tranquil, sometimes more or less agitated. * Erratic bowlders are rarely found in lower latitudes than about 40° in either hemisphere, and they become more abundant as the latitude increases, thus indi cating transports by currents of floating ice, freighted with rocks, from the polar regions. — Lyell's Elements, (p. 173,J quoting Darwin. t Such as the columns of trap, sometimes of enormous size, which are found scattered, up and down, through the great Connecticut valley, often at a great dis tance from their parent ridges. The most remarkable case in this range is ten miles west of Hartford, on the Albany turnpike. — See Tour to Quebec. 63 Moving waters appear to have first transported, and then, in a state of comparative quietude, to have arranged these masses by sedimentary deposition. The effects of diluvial devastation are in a considerable degree veiled, by the gradual depositions of sedimentary matter, during the decline of the velocity of the moving waters. Granting that the crust of the earth has been covered by water, which has been in any way withdrawn, or that the land has been lifted from a state of submersion in an ocean, there must evidently have resulted a multitude of local lakes, determined in their form and position by the basin shape so often traced by contiguous hills and high grounds; in these, separate and independent deposits might have been going on for a length of time. Those lakes that had no permanent supply of water, would, of course, be ex hausted by soakage and by evaporation : others would burst their barriers, or gradually wear them down, and during their escape, produce diluvial ravages ; while those only would be perennial, which were fed by streams and springs. Many valleys of denudation, as they are called by Prof. Buck- land, were probably produced by diluvial action, aided by convul sions. Such valleys are conspicuously seen in the South of Eng land, on the channel coast, where similar strata are found capping contiguous hills, projecting at their sides, and running beneath their foundations; a curve or hollow having been scooped out between, thus indicating the effects of great rushing torrents, pre ceded or attended perhaps by earthquakes that, more or less, broke up the superficial strata.* Many valleys were doubtless produced in this manner; and others by great diversity of causes. Extraneous Contents ofthe Diluvium. — In all countries, where curiosity and intelligence exist, single bones, and entire skeletons of the larger animals, often of extinct species, but chiefly of known genera, are found abundantly in the diluvium. Whales, sharks, and other fishes ; crocodiles, and other amphibia ; the mastodon, the mammoth or extinct elephant, and other species of elephants, approaching to or quite like those of modern times ; * Reliquiae Diluvianse. 64 the rhinoceros, the hippopotamus ; hyenas, tigers, deer, horses ; various species of the bovine family, and a multitude more, are found in the diluvium, or in the tertiary, at a greater or less depth ; and in all the variety of circumstances in which they may be sup posed to have been buried, either by ordinary occurrences, or by a catastrophe such as a sudden and violent deluge. It appears, from Dr. H. H. Hayden's Geological Essays, that under the diluvium of the Atlantic portion of the middle and southern states, there lie buried great quantities of the bones of whales, sharks, porpoises, mastodons, Asiatic elephants, and other large animals, along with numerous trees, sometimes retaining their fruit. Layers of marine mud are also found, deep in the diluvium, beneath the present low water mark. There are also vast deposits of shells, and especially of a gigan tic oyster, in many parts of the southern states. They are found, not only in digging for wells, but they form great beds in various places.* Near Tours, in France, is a stratum of oyster shells twenty seven miles long and twenty feet thick. But the collections in the southern states far exceed this. A stratum on the whole continuous, although mixed more or less, with the general diluvium and other materials of the country, has been traced from the Eutaw Springs, in South Carolina, to the Chickasaw country ; six hundred miles in length, by ten, or from that to one hundred in breadth.f There can be no doubt that many of the beds of oyster shells, which have been attributed to the aboriginal Indians of this coun try are diluviul or tertiary deposits. The bones and skeletons of large animals, especially ofthe mas todon and mammoth, are found in wide dispersion, and in very re mote countries, in both Americas, in Europe, and in Asia. In north ern Asia, the tusks of the extinct elephant or mammoth are discov ered in the banks of almost every river, and the ivory is found in such abundance, as to be a regular article of commerce. An enormous carcase of the northern or extinct Asiatic elephant, by the gradual thawing of the frozen bank in which it was imbedded, * Many ofthe cases cited are doubtless in the tertiary. t We suppose these to belong rather to the tertiary. 65 high above the water, fell down a few years since, and exhibited the flesh in full preservation ; the long bristly hair and vast massy hide, requiring a large number of men to carry it, afforded proof irrefra gable, of the existence of the animal in those rigorous climates, and of his sudden extinction, inhumation and congelation, with so little interval of time, that putrefaction had not commenced, and has not since taken place, during a succession of ages. It has been a favorite view with the religious world, that the deluge of the Bible was the cause of the wide dispersion and sep ulture of the extinct gigantic races, whose remains are found in diluvium in the various quarters of the world, and that whole races of animals were thus extinguished, and their bodies buried in the wreck of the planet. Such a scene of devastation was thought to be well fitted to produce these effects, as it was certainly ill adapted to the comparatively tranquil life and death of the suc cessive generations of marine and aqueous animals, that peopled the earlier oceans. A more extended and careful examination, and a more scrupu lous weighing of evidence has, however, induced most geologists, including those who have the greatest reverence for the Scriptures, greatly to modify these opinions. While all agree that the ex tinction of races of animals, in various cases, by deluges, is not only possible but probable, it is admitted that a multitude of the animals whose remains are found, perished by ordinary events, by miring, by accidental drowning, by mutual warfare, by disease, by old age, and by the prowess of the hunter, while the natural and usual movement of the waters of the earth, aided by the ac cumulations of time, may have effected their sepulture. That all lands have been elevated from beneath the waters, and that some parts of the world have been repeatedly submerged and raised is, on grounds strictly geological, believed by all geologists ; nor can we hesitate to admit also that flowing if not rushing wa ters, have passed over the surface of all countries ; hence such effects as are appropriate to a general deluge are noticed in every region. Shall we add to this roll the following facts, cited on credible authority ? The skeleton of a whale lies on the top of the mountain Sandhorn, three thousand feet high, on the coast of the Northern Sea. 66 So late as June, 1824, the remains of a whale were found on the westernmost Stappen, a mountain in Finmarck, at an eleva tion of eight hundred feet above the ocean. The bones, reported to be vertebrae, were lost by shipwreck on their passage to Eng land. Similar remains are said to exist also in North Fugeloe, another mountain in those regions. — Penn. While it may be supposed that there is no cause, except a de luge, that could have conveyed the whales to those elevations, it may perhaps be admitted by some, that the rising of the land may have brought up the skeletons, as Mr. Lyell supposes that bowlder stones may have fallen from sea cliffs, and being rounded in the ocean, have been then lifted into daylight. If the elevation of land from the deep be admitted — and the fact is unquestionable — then it follows of course, that when the bottom of the sea, with its varieties of surface, of plains, valleys, hills, and mountains, is raised above the water so as to become dry land, then every thing that was lying in the abyss must be brought into view, or within the reach of exploration, and in this manner most interesting disclosures may in future eras be made. Contrast between Diluvial, and Tranquil Aqueous Agency. — The agency of water, whether fresh or salt, in sustaining, depos iting, and burying organized bodies in solid rock, (except the ef fects of occasional convulsions,) was, evidently, tranquil and long continued ; giving time for many generations of the same or of different races, and for all the alternations and successions of the strata with different organized bodies. The occasional intervention of igneous irruption, whether sub marine or subterrene, below, or among, or upon the strata of aqueous origin, only increases the necessity of time, and when these coincidences occur, they add to the evidence of grand geo logical cycles. But diluvial agency is usually violent, sudden, and of short du ration. If the universal deluge recorded in Genesis, be taken as a type of diluvial action, and the time and the elevation stated in the his tory, as measured by existing mountains, be taken into the ac? count, nothing could be more violent, destructive, and overwhelm ing ; and certainly upon the face of the earth are every where 67 recorded in legible characters, the necessary physical effects of such a debacle. It has entered but little into the views of any except geologists to discriminate between these two classes of effects. They are as wide apart as possible, and nothing in science is more unskilful or more unhappy than to confound them, as is constantly done by the unlearned in geology, who are intent on attributing all geolo gical effects to the deluge. The surface of our planet has, either at one period or many, been swept by violent, agitated torrents of water, which cov ered the earth every where with its own ruins, but probably cata clysms did not form any of the firm strata filled with organized remains. Volcanoes. — Their probable causes have been already men tioned in our view of elementary action, and it is sufficient for our present purpose briefly to advert to volcanoes as striking phys ical features of the earth. Active volcanoes are well known ; their causes are now, as they have ever been, in operation, and lava beds and currents are constantly forming in many countries, so that, in one region or another, the earth is never free from vol canic action cognizable by the senses. The products of volca noes often bear, in their very texture and features, palpable marks of the agency of fire, and thus they inform us, in very intelligible language, that they are indeed ignigenous : even when these fea tures are not distinctly legible, it often happens that the geographi cal and geological position of the masses does not permit us to en tertain a doubt of their volcanic origin. Although they may form beds of solid rock, which have no appearance of scoriae, cinders, glass, or gaseous inflation, except, perhaps, on their upper surfaces, we still observe their currents, and recognize their birth by fire. Volcanic currents overflow whatever lies in their way, and there fore we find them covering, occasionally, every geological forma tion, and every work of man. The superincumbent mass is, therefore, of more recent origin than that upon which it lies. The evidence presented by the eruptions of active volcanoes, and the igneous formations which they produce, goes then to establish the truth of geological suc cession, but does not imply that its events are more ancient than the masses which are covered. 68 Extinct Volcanoes.— Formerly extinct volcanoes were vaguely referred to, but without decisive proof of their real igneous origin. Many uninstructed persons were formerly ready to find extinct volcanoes in conical hills, especially if they had a hollow on the summit ; and porous stones, of whatever kind, were referred to a similar origin. It was a very captivating and sublime idea, that volcanic fire, still bursting forth, in many places, with destructive energy, had, in times long past, exerted agencies still more exten sive — covering provinces with ruins, and operating even in the bed of the primeval oceans. Still the speculation was regarded as somewhat visionary till the middle of the last century, when the subject of extinct volcanoes began to be investigated with accuracy and skill. It will be sufficient to name the so much disputed country of Auvergne, Velay, and Viverais, in France, which has been often examined by able geologists ; and now no one visits that region without being convinced that it is of volcanic origin. This dis trict lies upon the river Rhone, nearly in the angle formed by it with the Mediterranean, and covers a square area of forty or fifty leagues in diameter. Craters, regularly formed, often entire, sometimes with the thin and scorified edge of the lip in fine preservation, and oc casionally of vast dimensions ; here, black, rugged and scathed with fire — there, overgrown with trees, and there, filled with water ; dykes of solid rock cutting through the volcanic cones ; currents of lava, lying where they flowed from the crater, or where they burst from the sides or foot of the ruptured mountain, extending many miles and many leagues, traceable directly to their source, winding along the gorges and the sinuosities of the valleys, now and then diverted from their course by rocks, hills, and other obstacles ; sometimes damming up rivers, whose beds they have crossed or obstructed, and thus forming lakes of con siderable dimensions ; exhibiting all the varieties of lithoid lava, from that which is compact like rock, to that which is, in a greater or less degree, porous and vesicular ; crowned or mixed with slag, scoriae, pumice, olivine, and other products of known and active volcanoes ; displaying frequently a structure, now spherical, ovoi dal and concentric ; now prismatic and columnar, and fronting 69 streams, and bounding valleys, with ranges of columns, equalling or rivalling the regularity of the basaltic colonnades of Fingal's Cave and the Giant's Causeway : such are a few of the most striking features of these countries, which are so affluent in proofs of igneous origin, that there is nothing needed but to select, care fully and judiciously, those facts which will be the most decisive, especially with respect to minds not familiar with geological sub jects. The volcanoes of the Auvergne,