4 
 
Ex Libris 
 
 Joseph Halle Schaffner 
 
 I 
 
 From the Library of 
 Joseph Halle Schaffner, 
 
 Friend of the University 
 
 THIS BOOK IS MO LONGER 
 THE PROPERTY OF THE 
 UNIVERSITY OF CHICAGO LIBRARY! 
 
 f± _ 
 
 E.N. da CAndradi? 
 
 FefTovv of t fie Royaf Society 
 
A N 
 
 ORIGINAL THEORY 
 
 O R 
 
 NEW HYPOTHESIS 
 
 OF THE 
 
 UNIVERSE, 
 
 Founded upon the 
 
 LAWS of NATURE, 
 
 AND SOLVING BY 
 
 MATHEMATICAL PRINCIPLES 
 
 THE 
 
 General Phenomena of the Visible Creation ? * 
 
 AND PARTICULARLY 
 
 The V I A L A C T E A. 
 
 Compris’d in Nine Familiar Letters from the Author to his Friend. 
 
 And Illudrated with upwards of Thirty Graven and Mezzotinto Plates, 
 
 By the Bed: Masters. 
 
 By THOMAS WRIGHT, of Durham. 
 
 One Sun by Day , by Night ten Thoufand Jhine , 
 
 And, light us deep into the Deity. Dr. Young. 
 
 LONDON: 
 
 Printed for the Author, and fold by H. Chapelle, in Grofvenor-Street* 
 
 MDCCL. 
 
I 
 
 1 
 
 m vi. 
 
 ,umo ' 
 
 i -QtfUie ■ . • 
 
 Digitized by the Internet Archive 
 in 2017 with funding from 
 Getty Research Institute 
 
 
 
 * - 
 
 
 https://archive.org/details/originaltheoryorOOwrig 
 
THE 
 
 PREFACE. 
 
 H E Author of the following Letters having been 
 flattered into a Belief, that they may probably prove of 
 fome Ufe, or at leaft Amufementto the World, he has 
 ventured to give them, at the Requeft of his Friends, 
 to thePublick. His chief Deflgn will be found an At- 
 tempt towards folving the Phenomena of the ViaLaSiea , 
 and in confequence of that Solution, the framing of a 
 regular and rational Theory of the known Univerfe, before unattempted 
 by any. But he is very fenfible how difficult a Talk it is to advance any 
 new Do&rine with Succefs, thofe who have hitherto attempted to propagate 
 aftronomical Difcoveries in all Ages, have been but ill rewarded for their La- 
 bours, tho’ finally they have proved of the greateft Benefit and Advantage 
 to Mankind. This ungrateful Leflon we learn from the Fate of thofe in- 
 genious Men, who, in ignorant Times, have unjuftly fuffered for their fupe- 
 rior Knowledge and Difcoveries ; they who firft conceived the Earth a Ball, 
 were treated only with Contempt for their idle and ridiculous Suppofition, 
 as it was called ; and he who firft attempted to explain the Antipodes , loft his 
 Life by it ; but in this Age Philofophers have nothing to fear of this fort, 
 the great Difadvantages attending Authors now, are of a widely different 
 
 A 2 • Nature, 
 
to PREFACE. 
 
 Nature, rifing from the infinite Number of Pretenders to Knowledge in 
 this Science, and much is to be apprehended from improper Judges, tho’ 
 from real ones nothing; for nothing is more certain than this, as much as 
 any SubjeCt exceeds the common Capacity of Readers, fo much will the 
 Work in general be condemned ; the Air of Knowledge is at leaf! in 
 finding Fault, and this vain Pretence generally leads People, who have no 
 real Foundation for their Judgment to argue from, to ridicule what they 
 are too fenftble they do not underhand. Thus the fame Difadvantages too 
 often attend both in publick and private an exceeding good Production ' 
 equally the fame as a very bad one : But the Author is not vain enough to 
 think this Work without Faults, has rather Reafon to fear, from the 
 Weaknefs of his own Capacity, that there may be many ; but he hopes 
 the Defign of the Whole will, in fome meafure, plead for the Imperfection 
 of the Parts, if the Merits of the Plan fhould be found infufficient for his 
 full Pardon, in attempting fo extenfive a SubjeCt. 
 
 In a Syftem thus naturally tending to propagate the Principles of Virtue, 
 and vindicate the Laws of Providence, we may indeed fay too little, but 
 cannot furely fay too much ; and to make any further Apology fora Work of 
 fuch Nature, where the Glory of the Divine Being of courfe muft be the 
 principal ObjeCt in View, would be too like rendering Virtue accountable to 
 Vice for any Author to expeCt to benefit by fuch Excufe. The Motive 
 which induces us to the Attempt of any Performance, where no good Rea- 
 fon can be fuppofed to be given for the Omifiion, or NegleCt of it, will al- 
 ways be judged an unneceffary Promulgation, and confequently every At- 
 tempt towards the Difcovery of Truth, the Enlargement of our Minds, and 
 the Improvement of our Underflandings will naturally become a Duty. If 
 therefore this Undertaking falls fhort of being inflrumental towards the ad- 
 vancing the Adoration of the Divine Being in his infinite Creation of high- 
 er Works, and proves unable to anfwer all Objections that may pofiibly 
 arife againft it, yet will its Imperfections appear of fuch a Nature to every 
 candid Reader, as to afford the Author a lufficient Apology for producing 
 them to the World : And it is to be hoped farther, that where a Work is 
 entirely upon a new Plan, and the Beginning, as it were, of a new Science, 
 before unattempted in any Language, the i\uthor having dug all his Ideas 
 from the Mines of Nature, is furely intitled to every kind of Indulgence. 
 
 To 
 
V 
 
 PREFACE. 
 
 To thofe who are weak enough to think that fuch Enquiries as thefe 
 are over-curious, vain, and prefumptive, and would willingly, fuitable to 
 their own Ignorance and Comprehenfion, fet Bounds to other People’s 
 Labours, I anfvver with Mr. Huygens , “ That if our Forefathers had 
 “ been at this Rate fcrupulous, we might have been ignorant dill of the 
 “ Magnitude and Figure of the Earth j or that there was fuch a Place as 
 “ America. We fhould not have known that the Moon is enlightened by 
 “ the Sun’s Rays, nor what the Caufes of the Eclipfes of each of them 
 <c are ; nor a Multitude of other Things brought to Light by the late 
 < c Difcoveries in Adronomy; for what can a Man imagine more abdrufe, 
 * ( or lefs likely to be known, than what is now as clear as the Sun.” 
 
 Had we dill paid that Homage to a Name, 
 
 Which only God and Nature judly claim ; 
 
 The wedern Seas had been our utmod Bound, 
 
 Where Poets dill might dream the Sun was drown’d; 
 
 And all the Stars that dune in Southern Skies, 
 
 Had been admir’d by none but favage Eyes. 
 
 Dryden. 
 
 Beddes the Noblenefs and Pleafure of thefe Studies, Wifdom and Mo- 
 rality are naturally advanced, and much benefited by them, and even Re- 
 ligion itfelf receives a double Ludre, “ to the Confufion of thofe who 
 «« would have the Earth, and all Things formed by the fhufRing Concourfe 
 “ of Atoms, or to be without Beginning.” In Adronomy, as well as in 
 natural Philofophy, though we cannot pofitively affirm every thing we fay 
 to beFafts and Truth, yet in fo noble and fublime a Study as that of Na- 
 ture, it is glorious, as Mr. Huygens fays, even to arrive at Probability. 
 
 Notwithdanding then the Difadvantages which ever have attended all 
 new Difcoveries, either thro’ the Ignorance of the Age, or the univerfal Paf- 
 fionof Ridicule in fuch contented Creatures, as can’t comprehend, yet ever at- 
 tacking with a fool-hardy Refolution, the advancing Enfigns of Knowledge, 
 if Ignorance was Virtue, and Wifdom Vice ; I fay, regardlefs of this noily 
 Shore, it is fure our Duty to fpring forward, and explore the fecret 
 Depths of Infinity, and the wonderful hidden Truths of this vad Ocean 
 of Beings. But how the heavenly Bodies were made, when they were 
 
 made 
 
VI 
 
 PREFACE. 
 
 made, and what they are made of, and many other Things relating to 
 their Entity, Nature, and Utility, feems in our prefent State not to be 
 within the Reach of human Philofophy; but then that they do exid, have 
 final Caufes, and were ordained for fome wife End, is evident beyond a 
 Doubt, and in this Light mod worthy of our Contemplation. 
 
 He who thro’ vad Immenfity can pierce, 
 
 See Worlds on Worlds compofe one Univerfe, 
 
 Obferve how Sydem into Sydem runs, 
 
 What other Planets, and what other Suns; 
 
 What varied Being peoples ev’ry Star j 
 
 May tell why Heav’n made all Things as they are. 
 
 Pope. 
 
 To expeCt that fo new an Hypothecs fhould meet with univerfal Ap- 
 probation, would be an unpardonable Vanity j nor is it reafonable every 
 Reader fhould think the Author obliged to remove all his Prejudices and 
 Partialities, fo far as to give him the perfect Picture of the Univerfe he 
 likes bed. In many Cafes it would be fo far from being better for the 
 World, if all Men judged and thought alike, that Providence feems rather 
 to have guarded againd it as an Evil, than any how to have promoted it 
 as a general Good : But the following Theory regards the Whole rather 
 than Individuals: And the many worthy Authors cited in the Work, who 
 have all greatly favoured this exten five Way of Thinking, will, I hope, 
 be a fufficient Excufe for forming thefe obvious Conjectures into a Theory, 
 efpecially where fo great a Problem is attempted as the Solution of the Via 
 Laffeal Pbrenomenon, which has hitherto been looked upon as an infur- 
 mountable Difficulty. How the Author has fucceeded in this Point, is 
 a Quedion of no great Confequence ; hehas certainly done his bed ; ano- 
 ther, no Doubt, will do better, and a third perhaps, by fome more rational 
 Hypothefis, may perfect this Theory, and reduce the Whole to infallible 
 Demondration : The fil'd Sydem of the folar Planets was far from a true 
 one, but it led the Way to Perfection, and the lad we can never too 
 much admire. It is well known, that the fird Sydem of the Planets was 
 alfo but a Conjecture, yet none will deny that it was an happy one. 
 
 The 
 
VII 
 
 PREFACE. 
 
 The Difcovery of the Magnet Poles j the Government of the Tides ; 
 proportional Diftance and Periods of the Planets, &c. have all their Ufes, 
 and undoubtedly were defigned to be known. Ignorance is the Difgrace 
 of Mankind, and finks human Nature almoft to that of Reptiles. Know- 
 ledge is its Glory and the diftinguifhing Charadteriftic of rational Creatures. 
 
 To Enquiries of this fort, then lure we may fay with Milton, That 
 
 God’s own Ear listens delighted. 
 
 The Subjedt is, no Doubt, the nobleft in Nature, and as fuch, will al- 
 ways merit the Attention of the thinking Part of Mankind. Men of 
 Learning and Science, in all Ages, have ever made it their peculiar Study. 
 Towards the latter End of the Republic, and afterwards in the more peace- 
 able Times of Trajan and the Plinys, we have no Reafon to doubt but 
 that Aftronomy was in the higheft Reputation : And notwithftanding 
 Greece had been the chief Seat of the Philofophers, yet may we luppofe 
 Rome in thofe Days little inferior in the Knowledge of the Stars, when we 
 find Men * of the firft Figure in Life become Authors upon the Subjedt. 
 
 We have many Inftances to fhew, that Aftronomy was in the greatefl 
 Repute amongft the Antients of all Ranks, and almoft every where look- 
 ed upon as one of the greateft, if not as one of the firft Qualifications of 
 their beft Men. As a Confirmation of which, we find in the hiftorical 
 Accounts of the Argives , a very warm Conteft betwixt the two Sons of 
 Pelops 1205 Years before Chrijl , thus teftified by Lucian: When the Ar- 
 gives, by publick Confent, had decreed that the Kingdom fhould fall to 
 him of the two, who fhould manifeft himfelf the raoft learned in the 
 Knowledge of the Stars, Thyejles thereupon is faid to have made known to 
 them, the Conftellation, or Sign of the Zodiack call’d Aries : But Atreus at 
 the fame time difcovering to themtheCourfeof the Sun, with his various Ri- 
 ling and Setting, demonftrating his Motion to be * contrary to that of the 
 Heavens, or diurnal Motion of the Stars, was thereupon eledted King. 
 
 * Cicero tranflated the Phaenomena of Aratus into Latin Verfe. Julius Cccfar , as Pliny 
 relates, wrote of Aftronomy in Greek , and is faid to have left feveral Books of the Motion of 
 the Stars behind him, derived from the Doctrine of the Egyptians. Ant. Chrif. 45. He with 
 Sojigenes reformed the Roman Year, which was firft invented by Numa Pompilius. Germa- 
 nicus Cafar alfo tranflated Aratus' s Phaenomena into Latin Verfe Anno Dom. 15. Tiberius 
 and Hadrian are alfo faid to have wrote on Aftronomy. 
 
 * Hence arofe the Fable of the Sun’s going backwards in the Days of Atreus , as if ftruck 
 with Abhorrence of his bloody Banquet. Vide Ovid's Metamorphofis. 
 
 To 
 
viii PREFACE. 
 
 To recite more of the moft eminent Patrons andProfelTors of this kind 
 of Learning here, will carry me too far from my prefent Purpofe; for farther 
 Information therefore, I fhall refer the inquifitive Reader, to that curious 
 Catalogue in Sherburris Sphere of Manilius , where fo many ruling -{•• Men 
 of all Ages and Nations fwell, and illuftrate the Number. 
 
 In aWord, when we look upon the Univerfe as a vaft Infinity of Worlds, 
 aCted upon by an eternal Agent, and crouded full of Beings, all tending 
 through their various States to a final Perfection, and refleCt upon the 
 many illuftrious Perfonages, who have, from time to time, thought it a 
 kind of Duty to become Obfervers, and confequently Admirers of this 
 ftupendious Sphere of primary Bodies, and diligent Enquirers into the ge- 
 neral Laws and Principles of Nature, who can avoid being filled with a 
 kind of enthufiaftic Ambition, to be acknowledged one of the Number, 
 who, as it were, by thus adding his Atom to the Whole, humbly endea- 
 vours to contribute towards the due Adoration of its great and divine Au- 
 thor. 
 
 I judge it will be quite unnecefifary to fay any thing about the Order of 
 the Work, fince that would be only a Repetition of the Table of Con- 
 tents, to which the Reader is referred, as to the propereft Account that can 
 here be given. 
 
 f Seven Emperors, nine Kings, and as many fovereign Princes. Charlemagne wrote Ephe- 
 meridesy and named the Months and Winds in High Dutchy 770. Rich. II. £3V. 
 
 THE 
 
 v 
 
THE 
 
 CONTENTS. 
 
 LETTER the FIRST. 
 
 /~> 0 ncerning the Opinions of the mojl eminent Authors whofe Sentiments upon 
 
 ^ this Subject have been publifhed in their Works* Pag© i 
 
 LETTER the SECOND. 
 
 Concerning the Nature of Mathematical Certainty, and the ’various Degrees 
 of Moral Probability proper for Conjedlure . 9 
 
 LETTER the THIRD. 
 
 Concerning the Nature , Magnitude , and Motion of the Planetary Bodies 
 round the Sun. 1 8 
 
 LETTER the FOURTH. 
 
 Of the Nature of the heavenly Bodies continued , with the Opinions of the 
 Antients concerning the Sun and Stars. 27 
 
 LETTER the FIFTH. 
 
 Of the Order , Di fiance, and Multiplicity of the Stars, the Via Ladtea, and 
 Extent of the vifible Creation. 37 
 
 LETTER the SIXTH. 
 
 Oj General Motion amongjl the Stars , the Plurality of Sy ferns , and Innu - 
 mer ability of Worlds. 48 
 
 LETTER the SEVENTH. 
 
 The Hypothecs, or Theory , fully explained and demonfir at ed, proving the f de- 
 real Creation to be finite. 5 8 
 
 LETTER the EIGHTH. 
 
 Of Time and Space , with regard to the known Objects of Immenfity and 
 Duration , 6 7 
 
 LETTER the NINTH. 
 
 RefieElions, by way of General Scolia, of Confequences relating to the Im- 
 mortality of the Soul, and concerning Infinity and Eternity. 77 
 
 D I R E C- 
 
Directions for placing the PLATES. 
 
 Plate. 
 
 Page. 
 
 I. 
 
 10 
 
 II. 
 
 1 1 
 
 III. 
 
 16 
 
 ,IV. 
 
 20 
 
 V. 
 
 ibid. 
 
 VI. 
 
 22 
 
 VII. 
 
 ibid. 
 
 VIII. 
 
 ibid. 
 
 Plate. 
 
 Page. 
 
 IX. 
 
 22 
 
 X. 
 
 23 
 
 XI. 
 
 35 
 
 XII. 
 
 . 3 8 
 
 XIII. 
 
 ibid. 
 
 XIV. 
 
 40 
 
 XV. 
 
 A 2 
 
 XVI. 
 
 ibid. 
 
 Plate. 
 
 Page. 
 
 XVII. 
 
 5 1 
 
 XVIII. 
 
 5 2 
 
 XIX. 
 
 56 
 
 XX. 
 
 
 XXI. 
 
 62 
 
 XXII. 
 
 63 
 
 XXIII. 
 
 . 6 4 
 
 XXIV. 
 
 ibid. 
 
 Plate. Page. 
 
 XXV. 64 
 
 XXVI. ibid. 
 XXVII. 64 
 XXVIII. 65 
 
 XXIX. ibid. 
 
 XXX. 7 o 
 
 XXXI. 83 
 XXXII. ibid. 
 
 Some of the Principal ERRATA. 
 
 Page 
 
 Line 
 
 the Words 
 
 Read. 
 
 2 
 
 ult. 
 
 to ceafe relating 
 
 ceafing to relate 
 
 4 
 
 3 
 
 Phaenomenon 
 
 Phenomena 
 
 16 
 
 IS 
 
 incomfible 
 
 incomprehenfible 
 
 21 
 
 12 
 
 comprehend 
 
 comprehending 
 
 33 
 
 28 
 
 compared 
 
 is compared 
 
 34 
 
 37 
 
 form 
 
 from 
 
 43 
 
 20 
 
 volving 
 
 revolving 
 
 49 
 
 24 
 
 immoveable 
 
 moveable 
 
 61 
 
 J 9 
 
 much 
 
 much as 
 
 62 
 
 28 
 
 XXIII. 
 
 XXI. 
 
 65 
 
 4 
 
 where 
 
 any where 
 
 67 
 
 15 
 
 alfo 
 
 all fo 
 
 69 
 
 29 
 
 one 
 
 our 
 
 Plate X. read the Charaflers of the Planets in this Order % 5 T? c? 2 
 
 / 
 
 THE 
 
A 
 
 L I 
 
 O F T H E 
 
 T 
 
 SUBSCRIBERS. 
 
 A. 
 
 T 0 R D Anion. 
 
 Hon. Mr. Archer. 
 Charles Ambler, Efq; 
 
 B. 
 
 Duke of Beaufort. 
 
 Duke of Bedford. 
 
 Dutchefs of Beaufort. 
 
 Lord Berkely, of Straton. 
 Miles Barne, Efq ; 
 
 Lancelot Barton, Efq-, 
 
 Hon. Antoine Bentinck. 
 
 Hon. John Bentinck. 
 Norbone Berkely, Efq ; 
 
 John Brown, Efq- t 
 
 Blaman, Efq ; 
 
 Thomas Brand, EJq-, 
 
 J. Bevis, M. D. 
 
 Rev. T. Bonney, A. M. 
 
 C. 
 
 Countejs of Cunengelby. 
 Lord Cornwallis. 
 
 Lady Cornwallis. 
 
 Edward Cave, Efq ; 
 
 John Chamock, Ffq ; 
 
 Hon. and Rev. Dr. Cowper. 
 Mr. Richard Chad. 
 
 Mr. Henry Chapell. 
 
 If. Colepepper. 
 
 Mr. George Conyers. 
 
 D. 
 
 Rev. John Dealtary, A. M. 
 
 Mr. Samuel Dent. 
 
 ’ F. 
 
 Charles Fitzrea Scudamore, Efq ; 
 Kean Fitzgerald, Efq ; 
 
 Thomas Fonnerau, Efq ; 
 
 Robert Rakes Fulthorpe, Efq- t 
 Mr. Samuel Farrant. 
 
 Mr. Paul Fourdrinier. 
 
 G. 
 
 Marchionefs Grey. 
 
 Lord Glenorchy. 
 
 Francis Godolphin, Efq y 
 Roger Gale, Efq ; 
 
 James Gibbon, Efq- t 
 Ralph Goward, Efq; 
 
 Ralph Gowland, Efq ; 
 
 Ralph Gowland, funior , Efq- y 
 Dr. Gregory. 
 
 Dr. Griffith. 
 
 Rev. John Griffith, A. M. 
 
 Rev. Middlemore Griffith. 
 
 H. 
 
 Lord Hardwick, Lord High Chan- 
 cellor of Great- Britain. 
 
 Hon. James Hamilton. 
 
 Mr. Thomas Heath. 
 
 Mr. 'Fhomas Holt. 
 
 John Hughes, Efq j 
 
 Earl 
 
A LIST of the S 
 I. 
 
 Earl of Jerfey. 
 
 Richard Jackfon, Efq-, 
 
 Rev. Mr. Jones. 
 
 K. 
 
 Knowles, Efq ; 
 
 Dr. Kendrick. 
 
 Mrs. Kennon, 4. 
 
 L. 
 
 Lady Vicountefs Limerick. 
 
 Sir William Lee, Bart. 
 
 William Lefter, Efq - y 
 Rev. Dr. Long, Mafter of Pem- 
 broke-hall, Cambridge. 
 
 William Lloyd, Efq - y 
 Mr. Andrew Lawrence. 
 
 M. 
 
 R. J. Mead, M. D. 
 
 Richard Meyrick, M. D. 
 
 Owen Meyrick, Efq j 
 Pierce Meyrick, Efq- y 
 
 N. 
 
 Duke of Norfolk. 
 
 Lord North. 
 
 Lord Bifop of Norwich. 
 
 Richard Nicholls, Efq- y 
 Mrs. Nor fa. 
 
 P. 
 
 Duke of Portland. 
 
 Earl of Pembroke, &c. 2 
 Countefs of Pembroke, &c. 
 
 Lady Palmerfton. 
 
 Robert Money Penny, Efq - y 
 Sir Francis Pool. 
 
 Sir John Pool. 
 
 John Probyn, Efq - y 
 Rev. Mr. Pierce. 
 
 UBSCRIBERS. 
 
 Mr. Dominick Pile. 
 
 Mr. Powel, of Cambridge, 
 
 R. 
 
 Dutchefs of Richmond, &c. &c. 
 James Ralph, Efq j 
 Allan Ram fey, Efq ; 
 
 William Read, Efq- y 2. 
 
 Henry Reveley, Efq » 
 
 William Reveley, Efq - y 
 
 S. 
 
 Sir George Savile. 
 
 Serle, Efq> y 
 
 Rev. Dr. Smith, Mafer of Trinity 
 College, Cambridge, 
 
 Mifs Stonehoufe. 
 
 William Symonds, Efq- y 
 Mr. James Scot. 
 
 Mr. James Stephens. 
 
 T. 
 
 Lord Vijcount Townfhend. 
 
 John Temple, Efq ; 
 
 James Theobald, Efq- y 
 Charles Townfhend, Efq- y 
 Mrs. Mary Trevor. 
 
 Mr. James Thornton. 
 
 V. 
 
 Lord Vifcount Villiers. 
 
 W. 
 
 Lady Frances Williams. 
 
 Mijs Williams. 
 
 Mifs Charlotta Williams. 
 
 Rev. Thomas White, A. M. 
 
 ■ White, Efq- y 
 
 Charles Louis Wiedmarkter, Efqy 
 Mr. Ward. Y. 
 
 Hon. Philip York. . 
 
 Dr. Arthur Young, Preb. of Cant* 
 
LETTER the FIRST. 
 
 Opinions of the rnofi eminent Authors whofe Sentiments on the following Sub- 
 ject have been publifed in their Works, 
 
 SIR , 
 
 EFLECTING upon the agreeable Converfation of 
 our laft Meeting, which you may remember chiefly 
 turned upon the Stars, and the Nature of the planetary 
 Bodies j a Subject, which is generally allowed to give 
 true Pleafure to all thofe who take Delight in mathe- 
 matical Enquiries j and having not a little Regard to 
 the repeated Requefl: in your late Letters, I have at 
 length undertaken to explain to you, as far as I am able, my Theory of 
 the Univerfe, and the Ideas I have form’d of the known Creation. 
 
 The Hypothefis upon which this new Aftronomy is founded, and 
 now reduced into a regular Syftem, was the refult of my Aftronomical 
 Studies * full fifteen years ago, hence I hope you will allow, I have more 
 than obferved Horace's celebrated Aphorifm, 
 
 Nonumque prematur in annum. 
 
 * The firft Scheme of this Hypothefis was plann’d in the Year 1734, reprefenting in a Sec- 
 tion of the Creation, eighteen Feet long and one broad, feveral thoufand Worlds and Syf- 
 tems, and a great Number of emblematical Figures, now in the Author’s Poflefiion, together 
 with a Scheme of the entire Creation, completed fince, nine Feet long and fix broad, more 
 fully illuftrating upon the fame Conitru&ion the Innumerability of Syftems and Worlds. 
 
 B The 
 
2 
 
 / 
 
 LETTER the FIRST. 
 
 The Subject, I have often obferved, you have lidened to with a pleafed 
 Attention, and I am the more incouraged to explain it at large to you, 
 as I am perfwaded you don’t want to be convinced of its valuable Ufes 
 and Importance. 
 
 I remember you have often told me, that to apply ourfelves to the Study 
 of Nature, was the fured and readied Way to comeat any tolerable Know- 
 ledge of ourfelves, however difficult the Tafk might prove either in the 
 Attempt, or the attaining it, and the lefs to be negledled, as it never fails 
 to introduce a proper Knowledge of the Divine Being, as a certain Con- 
 fequence along with it, and fuch a Knowledge, as will naturally make every 
 Man, who has but a tolerable Share of common Senfe, and is not a Slave to 
 another’s Reafon, without any other Evidence or Motive, in all Sta- 
 tions, and under all Circumdances, Act justly, Live chearful- 
 iy, and die full of Hope in the Expe&ation of a happy Sequel, in Fu- 
 turity. 
 
 Eternity is written in the Skies : 
 
 Mankind’s Eternity, nor Faith alone > 
 
 Virtue grows there » — — — - 
 
 Dr. Young* 
 
 A learned Author on the Attributes, recommending thefe Studies as a 
 reafonable and moral Service, fays, “ Sure, it is mod becoming fuch im- 
 “ perfect Creatures as we are, to contemplate the Works of God with this 
 “ Defign, that we may difcern the Manifedations of Wifdom in them 
 u and thereby excite in ourfelves thofe devout AfFedtions, and that lu- 
 c ‘ perlative Refpedt, which is the very Edence of Praife.” 
 
 Who turns his Eye, on Nature's Midnight Face, 
 
 But mujt enquire what Hand behind the Scene, 4 
 
 What Arm Almighty, put thefe wheeling Globes 
 In Motion, and wound up the vad Machine ? 
 
 The enchanting Idea Milton had of the Subjedts of Adronomy (whofe 
 truly fublime Way of thinking and writing perhaps was never fo nearly 
 equalled, or attempted before this Reverend Author’s Night-Thoughts , ap- 
 pear’d is finely fhewn in the Eighth Book of his Paradtfe Lofl , where he 
 makes his Adam , fo earnedly attentive to the Angel Gabriel, as to ceafe 
 relating the Myderies of Creation. 
 
 The 
 
3 
 
 LETTER the FIRST. 
 
 The Angel ended, and his Adam's Ear 
 So charming left his Voice, that he awhile 
 Thought him dill fpeaking j dill flood fix’d to hear. 
 
 Milton's own Ideas of the Univerfe too, which no doubt he had ga- 
 thered from aflronomical Authors, and had reconciled himfelf to, we arc 
 fully made acquainted with in the fame Book, where the Arch-angel fays, 
 in anfwer to Adam ' s Enquiries. 
 
 Other Suns perhaps 
 
 With their attendant Moons thou wilt defcry 
 Communicating Male and Female Light, 
 
 Which two great Sexes animate the World, 
 
 Stor'd in each Orb, perhaps with fome that live; 
 
 For fuch vafl Room in Nature, unpodeft 
 By living Soul, defert and defolate. 
 
 Only to fhine, yet fcarce to contribute 
 Each Orb a Glimpfe of Light, convey'd fo far 
 Down to this habitable, which returns 
 Light back to them, is obvious to Difpute. 
 
 But before I prefume to plan my own Difcoveries and Conjectures into a. 
 Theory, both in Juflice to thofe who have in fome meafure been in the 
 fame Way of Thinking, and alfo as a Defence of myfelf for producing fo 
 new an Hypothefis to the World, which otherwife (though any Apology 
 made to you I know will be unneceffary) may appear to too many but an 
 idle Chimera of my own. I judge it will be highly proper, by way 
 of flrengthening my own Arguments, and adding more Weight to what 
 I fhall myfelf advance in the following Letters, to give you in this 
 the Opinions of the mod able Writers, whofe Works I have read 
 upon the Subject. I mean fo far as relates to the now general received 
 Notion, that the Stars are all Suns, and furrounded with planetary Bodies, 
 with which I fhall fet out ; and fhew you, it is not a Thing merely taken 
 for granted, but has ever been the concurrent Notion of the Learned of all 
 Nations, as fhall be further fhewn, in its proper Place, and as nearly as 
 Poffibility will admit of, demonflrated to be Truth. 
 
 The following is an ExtraCl from Mr. Poland , in his Account of the 
 Works of 
 
 Tordanus Bruno. 
 
 k’ 
 
 j 
 
 “ The Divine Efficacy (fays this Author in his infinite Creation) cannot 
 “ fland idle, without the Want of Will or Power; but any Imbecillity in 
 
 B 2 “ fuch 
 
4 LETTER the FIRST. 
 
 4C fuch a Being argues Imperfedlion, and fince any finite Produce com- 
 “ pared with Infinity is as nothing, or rather as the Beginning of Good, 
 
 “ it muftbe no lefs idle, and invidious in producing a finite Effedt, than in 
 “ producing none at all. 
 
 “ Hence, as all Finites, fingly confidered, are but as Commencements 
 ‘ ‘ of fomething more to be expedted. 
 
 “ Omnipotence, in making the Creation finite, will appear to be no 
 “ lefs blameable for not being willing, than for not being able, to make it 
 c< otherwife; i. e. infinite, as being an infinite Agent upon a finite Subjedt, 
 “ which is repugnant to Reafon.” 
 
 It follows then that, Creation mull be not only extenfively, but inten- 
 fively indefinite, and beyond the Reach of the human Underflanding to 
 comprehend j and that the one is as neceflary as the other, i. e. an in- 
 finite Expanfe is as reconcileable to our Reafon, as infinite Parts are to our 
 Senfes. 
 
 AU the Attributes of the Divine Being are, as any one of them, incom- 
 libleto his Creatures ; why fhould our Imagination then be fuppofed to- 
 extend beyond the divine Adtivity ? 
 
 “ Thus, adds the above Author, the Excellency of God is adequately 
 “ magnified, and the Grandeur of his Empire made manifefl j he is not 
 4< glorified in one, but in numberlefs Suns ; not in one Earth, or in one 
 “ World, but in ten thoufand thoufand of infinite Globes.” 
 
 An infinite Reprefentation of an infinite Original, and a Spedtacle befit- 
 ting the Excellency and Eminence of him, that can neither be fully con- 
 ceived, imagined, or comprehended. 
 
 What read we here ? th’Exiftence of a God ? 
 
 Yes, and of other Beings, Man above , 
 
 Natives of /Ether ! Sons of higher Climes ! 
 
 Dr. Young. 
 
 “ If the Exigence of this one World be good or convenient, it is not 
 “ lefs good or convenient that there be infinite others like it. 
 
 ** The infinite efficient Caufe would be abfolutely defedtive, without an 
 “ infinite Effedt; and befides, by conceiving the Infinity of the Univerfe 
 “ and innumerable Beings, the Underflanding refls fatisfied, and is recon- 
 “ ciled with the Idea of an Eternity ; whereas, by afferting the contrary, 
 “ it is unavoidably plunged into innumerable Difficulties, and unfolvable 
 “ Inconveniencies, Paradoxes, and Abfurdities. 
 
 Again, fays the fame Writer, “ Did we butconfider and comprehend 
 41 all this, oh ! to what much further Confiderations and Comprehenfions 
 
 fhoud 
 
LETTER the FIRST. 5 
 
 w fhould we be carried ! as we might be fure to obtain that Happinefs 
 “ by virtue of this Science, which in other Sciences is fought after in vain. 
 
 This Profpedl vaft, what is it ? weigh’d aright, 
 
 ’Tis Nature's Syftem of Divinity, 
 
 And every Student of the Night infpires. 
 
 Dr. Young. 
 
 ’Tis elder Scripture, writ by God’s own Hand ; 
 
 Scripture authentic ! uncorrupt by Man. 
 
 “ This then is that Philofophy, which opens the Senfes, which fatisfie3 
 M the Mind, which enlarges the Underftanding, and which leads Man- 
 “ kind to the only true Beatitude, whereof they are capable according to 
 “ their natural State and Conftitution ; for it frees us from the follicitous 
 “ Purfuit of Pleafure, and from the anxious Apprehenfions of Pain, mak- 
 “ ing us to enjoy the good Things of the prefent Hour, and not to fear 
 “ more, than we hope from the future ; fince that fame Providence, or 
 “ Fate, or Fortune, which caufes the Viciffitudes of our particular Being, 
 “ will not let us know more of the one, than we are ignorant of the 
 “ other.” 
 
 And farther, “ From thefe Contemplations, if we do but rightly confider, 
 “ it will follow, that we ought never to be difpirited by any ftrange Ac- 
 “ cidents, through Excefs of Fear or Pain, nor ever be elated by any prof- 
 “ perous Event, through Excefs of Hope or Pleafure j whence we have 
 “ the Path to true Morality, and following it, we (hall of courle become 
 “ the magnanimous Defpifers of what Men of weak Minds fondly 
 “ Efteem, and be wife Judges of the Hiftory of Nature, which would be 
 “ written in our Minds, and confequently be chearful and ftridt Execu- 
 
 tioners of the divine Laws, which would thus be ingraved in the Cen- 
 “ ter of our Hearts. Seeking, as it were, in ourfelves, an Approbation of 
 “ our own Adtion, which alone is capable of true Content and Happi- 
 “ nefs.” 
 
 Christopher Huygens, 
 
 To whom the World is much indebted for many curious Inventions, and 
 Difcoveries, fays in \i\%. Planet ary Worlds , “ I mud be of the fame 
 “ Opinion with all the great Philofophers of our Age, that the 
 “ Sun is of the fame Nature with the fix’d Stars j and this will give us a 
 
 “ greater 
 
 f The Pendulum Clock ; the firft Difcovery of Jupiter's Satellites, and Saturn's Ring. 
 
LETTER the FIRST. 
 
 greater Idea of the World than all other Opinions can. For then 
 why may not every one of thefe Stars, or Suns, have as great a Retinue, 
 as our Sun, of Planets, with their Moons to wait upon them? Nay, 
 there is a manifeft Reafon why they ftiould j for, if we imagine our- 
 felves placed at an equal Diftance from the Sun and fix’d Stars, we 
 fliould then perceive no Difference at all betwixt them. 
 
 “ Why then may we not make ufe of the fame Judgment that we 
 would in that Cafe j and conclude, that our Star has no better Atten- 
 dance than the others ? So that what we allowed the Planets upon the 
 Account of our enjoying it, we muft likewife grant to all thofe Planets 
 that furround that prodigious Number of Suns. They muft have their 
 Plants and Animals, nay, their rational Creatures too, and thofe as great 
 Admirers and as diligent Obfervers of the Heavens as ourfelves ; and 
 muft conlequently enjoy whatever is fubfervient to, and requifite for 
 fuch Knowledge. 
 
 cc What a wonderful and amazing Scheme have we here of the mag- 
 nificent Vaftnefsof the Univerfe! So many Suns, fo many Earths, and 
 every one of them ftock’d with fo many Herbs, Trees, and Animals, 
 and adorned with fo many Seas and Mountains ! And how muft our 
 Wonder and Admiration be increafed, when we confider the prodi- 
 gious Diftance and Multitude of the Stars ?” 
 
 The O full on of Sir Isaac Newton. 
 
 This great Author, in his grand Scholia to che Principia, fays : — - <{ The 
 moft beautiful Syftem of the Sun, Planets, and Comets, could only pro- 
 ceed from the Counfel and Dominion of an intelligent and powerful 
 Being : And if the fix’d Stars are the Centers of other like Syftems, thefe, 
 being form’d by the like wife Counfel, muft be all fubjedf to the Do- 
 minion of One j efpecially, fince the Light of the fix’d Stars is of the 
 fame Nature with the Light of the Sun, and from every Syftem Light 
 paftes into all the other Syftems. And leaft the Syftems of the fix’d 
 Stars fhould by their Gravity fall mutually on each other, he (the Di- 
 vine Being) hath placed thofe Syftems at immenfe Diftances from on£ 
 another,” 
 
LETTER the FIRST. 
 
 7 
 
 The Opinion of Dr . Derham, in his Afh'o-Theology. 
 
 “ The new Sydem, fays he, fuppofeth there are many other Syf- 
 “ terns of Suns and Planets, befides that, in which we have our 
 “ Refidence j namely^ that every fix’d Star is a Sun, and incompafled 
 “ with a Sydem of Planets, both primary and fecondary, as well as ours. 
 
 “ Thefe feveral Sydems of the fixed Stars, as they are at a great and 
 “ diffident Didance from the Sun and us j fo they are imagined to be at 
 “ as due, and regular Didances from one another : By which means it is 
 “ that thofe Multitudes of fixed Stars appear to us of different Magnitudes, 
 “ the neared to us large ; thofe farther and farther, lefs and lefs; and 
 “ that fome, if not all of thofe vad Globes of the Univerfe, have a Mo- 
 M tion, is manifed to our Sight, and may eafily be concluded of all, from 
 “ the condant Similitude and Confent that the Works of Nature have 
 “ with one another.” 
 
 To this we may add, that this Sydem of the Univerfe, as it is phyfi- 
 cally demondrable, is far the mod rational and probable of any. Becaufe , 
 
 “ It is far the mod magnificent of any, and worthy of an infinite 
 “ Creator, whofe Power zn&WiJ* 'don 1, as they are without Bounds and 
 “ Meafure, fo may they, in all Probability, exert themfelves in the Creation 
 “ of many Sydems as well as one. And as Myriads of Sydems are more 
 “ for the Glory of God, and more demondrate his Attributes than one ; 
 “ fo it is no lefs probable than poffible, there may be many befides this 
 “ which we have the Privilege of living in.” A^nd as the dronged Con- 
 firmation of this, “ we fee it is really fo, as far as it is podible it can be 
 “ difcerned by us, at fuch immenfe Didances as thofe Sydems of the fixed 
 Stars are from us ; and we cannot reafonably expedt more.” 
 
 “ Since the Sun and fix’d Stars, fays Dr. Gregory, are the only great 
 “ Bodies of the Univerfe that have any native Light, they are judly 
 “ edeemed by Philofophers to be of the fame Kind, and defigned for the 
 “ fame Ufes ; and it is the Effedt of a Man’s Temper that fets a greater 
 “ Value upon his own Things than he ought, that makes him judge 
 “ the Sun to be the bigged of them all.” 
 
 That, as an elegant * Writer obferves, which we call the Morning, or 
 the Evening Star, is, in reality, a Planetary World ; which, with the four 
 others, that fo wonderfully, as Milton expreffes it, “ vary their mydick 
 “ Dance, are in themfelves dark Bodies, and fhine only by Refledtion; 
 “ have Fields and Seas, and Skies of their own j are furnifhed with all 
 Accommodations for animal Subfidence, and are fuppofed to be the 
 
 Abodes 
 
 * Contemplations on the ftarry Heavens. 
 
8 
 
 LETTER Yhe FIRST. 
 
 “ Abodes of intellectual Life. Again, The Sun, with all its attendent Planets 
 “ is but a very little Part of the grand Machine of the Univerfe. Every 
 “ Star — is really a vaft Globe, like the Sun, in Size and in Glory, no lefs 
 <{ fpacious, no lefs luminous, than the radiant Source of our Day ; fo that 
 “ every Star is the Center of a magnificent Syftem, has a Retinue of 
 “ Worlds irradiated by its Beams, and revolves round its aCtive Influence j 
 “ all which are loft to our Sight in immeafurable Trails of fEther. 
 
 “ Could we, fays the fame Author, wing our Way to the higheft ap- 
 “ parent Star — We Should there fee other Skies expanded, other Suns, 
 “ that distribute their inexhauftible Beams of Day ; other Stars, that gild 
 “ the alternate Night; and other perhaps nobler Syftems established j 
 £ : eftablifhed in unknown Profufion, through the boundlefs Dimenfions 
 <c of Space. Nor does the Dominion of the great Sovereign end there, \ 
 even at the End of this vaft Tour, we Should find ourfelves advanced 
 no farther than the Frontiers of Creation ; arrived only at the Suburbs 
 “ of the great Jehovah’s Kingdom.” 
 
 O for a Telefcope his Throne to reach ! 
 
 Tell me ye Learn’d on Earth ! or Bleft above ! 
 
 Yefearching, ye Newtonian Angels ! tell. 
 
 Where your great Mafters Orb ? His Planets where ? 
 
 Thofe confcious Satellites, thofe Morning Stars, 
 
 Pirft-born of Deity from central Love. 
 
 Dr. Young. 
 
 Many other Authorities might be produced from Writers of great Re- 
 pute, were it neceffary to trouble you with themf ; but I believe thofe 
 above will be abundantly fuflicient for the prefent Purpofe, if even an 
 Apology were wanting for my own Conjectures. I Shall therefore con- 
 clude this Letter with the following Paffage out of Pope'suniverjal Prayer^ 
 and in my next Shall proceed in the Work I have undertaken. 
 
 Yet not to Earth’s contracted Span, 
 
 Thy Goodnefs let me bound ; 
 
 Or think thee Lord alone of Man, 
 
 When thoufand Worlds are round, 
 
 I am , &c. 
 
 LETTER 
 
 + Purticulaily from Fontcnelle , &c. 
 
[ 9 ] 
 
 LETTER the SECOND. 
 
 Concerning 
 
 the Nature of Mathematical Certainty , and the • various 
 Degrees of Moral Probability proper for Conjecture. 
 
 SIR, 
 
 Y O U know how much I am an Enemy to the taking of any thing 
 for granted, merely becaufe a Perfon of reputed Judgment, has 
 been heard to fay, it abfolutely is fo ; an Ipfe dixit , and implicit 
 Faith in fome Cafes, may be both neceffary and uleful ; but here, in A- 
 ftronomy, I mean, every Man’s Reafon, by the Help of a very little 
 Mathematicks, is able to bring wonderful Truths to Light without them ; 
 and Truths not only of the higheft Importance to every Individual, but 
 of a great and common Confequence to all Mankind i And as fuch, in 
 all Ages of the World, have been judged worthy to be enquired into, by 
 the belt and wifeft of Philofophers. 
 
 You are likewife very fenfible how far the human Underftanding is 
 even at the beft, from being infallible, and don’t want to be told, how 
 difficult it is in a Subjedt of this Nature to arrive at any tolerable Degree of 
 Certainty, which before the Days of the fagacious Euclid , and the pe- 
 netrating Archimedes , was a Thing not to be expedted. And many things 
 which were then but barelyObjedts of Conjedture and Probability, havefince 
 been demonftrated to be infallibly true. Time and Obfervation will un- 
 doubtedly, atlaft, difeover every thing to us neceffary to our Natures, and 
 proper for us to know. As a Proof of which, we fee human Wifdom 
 daily increafes; and while a Capacity continues to make ourfelves ftill 
 more acquainted with the manifeft Wifdom and Power of God in the 
 Works of his Creation, who is to tell us where to flop our Enquiries ? 
 Or who is fo impious to fet Bounds to a Science, which fo evidently 
 fpreads through all Infinity, the Attributes of God, and an eternal Bails 
 for futuie Hope ? 
 
 This Branch, or rather Body of Aftronomy, I believe you will find 
 to be quite new j and though evident Truths, are the principal Thing to 
 be regarded in it, yet as being in its infant State, where lineal Demon- 
 
 C fixation 
 
10 LETTER THE SECOND; 
 
 fixation fails, as in fome Cafes it cannot be otherwife, I hope you will 
 give me Leave to make ufe of a weaker Way of Reafoning, to convince 
 you of the Point in Difpute, I mean of that by the Analogy of known 
 and natural Things. 
 
 I lhall be extremely unwilling to affirm any thing for a Faff, or Truth, 
 without hearing, if not the real Evidence, at lead a plaufible Reafon, next, 
 to a Conviction, or moral Certainty, along with it; and therefore I will 
 here endeavour to explain to you what I mean by moral Certainty and 
 alfo by mathematical Proof. 
 
 Mathematical Proof, or Certainty, proper for Conjedures, may, to 
 almoft every Capacity, be illudrated as follows : 
 
 Suppofe you had accidentally found a very fmall Part of a vifibly 
 broken Medallion, with nothing more exprefs upon it, than what is repre- 
 fented at Fig. i. Plate I. a Perlon totally unacquainted with the mathe- 
 matical Sciences, we may naturally conclude, would not be able to make 
 any thing of it, or in the lead comprehend what it originally was, or 
 meant ; but if an Adronomer ffiould chance to fee it, who of courfe we 
 are to fuppofe knew the Order and Proportion of the planetary Orbits, 
 he would immediately conclude, and with great Probability, on the Side 
 of his Conjedures, that it might be Part of a Medal reprefenting the So- 
 lar Sydem. In fuch a Cafe may we not very naturally fuppofe he would 
 reafon thus ? 
 
 The Arches A and B feem to be Portions of the refpedive Orbits of 
 Saturn and Jupiter , and what may lead us to believe, that they are really 
 fo, and Part of the Solar Sydem, is the oblique Curve C, which looks 
 not unlike the Trajedory of a Comet. 
 
 This furely would be far from an irrational Conjedure, and confe- 
 quently in fome Degree probable : But this is not fufficient you’ll fay ; To 
 prove it we mud have farther recourfe to the Mathematicks, and a Ma- 
 thematician would immediately thus demondrate it to be true. 
 
 Fird, by compleating the Circles geometrically from the fourth Book 
 of Euclid , by the Ad'idance of any three Points E. F. G. the original 
 Figure will be redored, as at Fig. 2. And fecondly, by affuming any 
 two Points, as F, E in the Curve C, if admitted a Parabola, by a well- 
 known Problem in Conic Sedions the Heliocentric Portion X. Y. Z. will 
 eafily be projeded and {hewn, as in Fig. 3. Ladly, join this in Podtion 
 to the former, and it will judly fupply the Orbit, or Path of fome one of 
 the Comets ; and if required, even what Comet may be difcovered by, 
 comparing the Perihelion Didance Y. S. with their general Elements or 
 Theories, in Dr. Hally ' s Synop/is of the Motion of thefe Bodies. And if 
 a farther Condonation of the Truth of thefe Conjedures were wanting, 
 
LETTER the SECOND, u 
 
 the fmall concentric Circles at D would now be allowed beyond a Con- 
 tradiction, to reprefent the fecondary Orbits of Saturn ; and thus the 
 firft Prefumption being carried thro’ feveral corroborating Degrees of Pro- 
 bability, almoft part a Difpute, would become a mathematical Certainty ; 
 and the above imperfeCt Piece of Medallion, would evidently appear be- 
 yond a Contradiction to be Part of a Reprefentation of the faid folar Syftem, 
 and fuch as is (hewn in Plate II. QJE. D. Thus in many Cafes, it often hap- 
 pens, that from a very fmall Part of orbicular Things, we are able to de- 
 termine the Form and Direction of the Whole : And hence you may 
 conceive it no very difficult Talk to a Mathematician, to defcribe the Or- 
 bits of all the Planets in the folar Syftem, though he had never obferved 
 them but in one and the fame Sign of the Zodiack ; thus far I have thought 
 it would not be amifs to explain to you the Nature of thofe Steps, by 
 which we arrive at moral Certainty, and where the SubjeCt will admit of 
 it, Mathematical Conviction, which will not a little contribute to ftreng- 
 then many of the Arguments hereafter made ufe of, and in fome Degree 
 ferve to fupply the Place of Proof, where infallible Demonftraiion can- 
 not from the Nature of the Thing be difcovered. 
 
 But befides the indifputable Principles of Geometry, the univerfai 
 Law of Analogy and Similitude of things, have a Privilege to affift us, 
 in Conjectures relating to the heavenly Bodies, and though not of equal 
 Force with the former, is often as conclufive as the SubjeCt requires. This 
 fort of probable Evidence (as Dr. Butler obferves,) is effentially diftin- 
 guiffied from “ Demonftrative by this, that it admits of Degrees j and 
 of all Variety of them, from the higheft moral Certainty to the very 
 “ lowed Prefumption; and that which chiefly conftitutes Probability, is 
 “ exprefled in the Word Likely, or Natural Likenefs, as to State or Being.” 
 This general Way of arguing, I think, is allowed to be evidently natural, 
 juft and conclufive, and unqueftionably to have its Weight in various De- 
 grees, towards determining our Judgment : For Inftance, fhould any igno- 
 rant Perfon, endowed with rational Principles, cut open a Pomegranate 
 of the natural Growth of England, and finding it full of fmall Globules, or 
 Kernels, upon being prefented with an every way fimilar Fruit, faid to be 
 the Produce of Italy , doubt of its being of the fame Nature, and com- 
 pofed of like globular Seeds within ; here indeed would be no mathemati- 
 cal Evidence to affift the Judgment, the ObjeCt of Proof being invifible, 
 but fure from the external Similitude, the ftrongeft Probability of their 
 •being alfo internally the fame. Again, 
 
 Is it natural to fuppofe, that the firft Perfon who found a’ Lark's Neft, 
 and in it feveral of the Female's Eggs, fhould have any Apprehenfions of 
 •finding none in the Nightingale's , only becaufe he had never feen one be- 
 
 C 2 fore, 
 
12 
 
 LETTER the SECOND. 
 
 fore, I believe the moft illiterate Perfon of theearliefl. Ages, who had Curi- 
 ofity enough for fuch a Search, would be greatly dilappointed in fuch a Cafe, 
 and far from concluding that the Nightingale had none. Farther, fhould 
 any one who had feen feveral Sorts of Fifh taken out of the River Thame j, 
 or out of the Nyle, have any fort of Sufpicion that he fhould find no fuch 
 Creatures in the Seine or the Ganges , though it fhould be allowed that he 
 had never feen any fuch Creatures that were known to come from thence. 
 Ocular Demonftration, in fuch a Cafe, would fure be unneceffary, and an 
 Evidence of the firft, I believe v/ould be abundantly fufficient to convince 
 us of what we ought to look for at leaf! in the laft : But then the Fifhes 
 of different Seas, and of Rivers are not of the fame Species you’ll fay j- 
 but as it were infinitely diverfified through all the aqueous World, this is, 
 and muff be granted, and alike Variety of Species muft alfo be granted, in 
 the former Cafe of the Birds: But no Objection can poffibly arife from any 
 fuch Diverfity, fince we don’t pretend to fay, nor is it at all neceffary, that' 
 the Beings in the fidereal Planets fhould be every where the fame with 
 thefe of our folar Syftem, a Variety muft every where be admitted, and will 
 always be admired, where the Work is Nature’s, and the Defign God’s. 
 
 All then that I here pretend to argue for, is a Univerfality of rational 
 Creatures to people Infinity, or rather fuch Parts of the Creation, as from 
 the Analogy and Nature of Things, we judge to be habitable Seats for 
 Beings, not unlike the mortal human. 
 
 Every Animal, and every Vegetable, that, as it were, naturally exifls 
 by the Virtues, Properties, or Laws of the mineral Kingdom, has fome- 
 thing of a fecondary Nature, depending upon it as a Principle j and to 
 fay that the Stars, which are a certain vifible fort of Cotemporaries in Space 
 with the Sun, have no like planetary Bodies with ours moving round them,, 
 becaufe we cannot poffibly fee them, is no lefs abfurd and ridiculous, than 
 to argue, that we can have no Reafon to expedt to find, in the proper 
 Seafon, Grapes upon every Vine — Figs upon every Tree — Rofes upon 
 every Bufh — only becaufe fome of them are at fuch a Diffance, that 
 neither Rofe, Fig or Grape, can be difcovered by the Eye. 
 
 This fort of Reafoning, though fome perhaps may neglect it, I am 
 perfwaded you will look upon as abundantly fufficient for Things out of the 
 Reach of Science to determine j and that the collective Body of Stars 
 have not been difcovered, to be together a proper Subjedt for fuch Con- 
 jectures before, can furely only proceed from the Want of Time, necef- 
 fary to compleat the Obfervations proper for a Foundation to build fuch an 
 Hypothefis, or Theory upon. This is the great Article in which the Mo- 
 derns have fo much, and ever will have* an Advantage over the Antients. 
 A.nd hence it will appear, That 
 
 The 
 
LETTER the SECOND. 13 
 
 The Improvements and Difcoveries of latter Ages are not at all owing 
 to the greater Capacity of the Moderns, but from the Advantages receiv- 
 ed, or arifing from the Inventions and Progrefs made by the Ancients. We 
 at firft in a manner walked by their Leading* firings, and though many of 
 them now are broke, or ufelefs, none can deny, but that formerly they 
 were of great Advantage in promoting and directing philofophical En- 
 quiries. 
 
 In an Affemblv of the mofl eminent Men of all Ages, if we may fup- 
 pofe fuch a Conference amongft the illuflrious Dead, on Purpofe to deliver 
 their leveral Sentiments familiarly together, on the mofl interefling Sub- 
 jects of natural Knowledge, who would not lament the Difadvantages, 
 poor old Thales , an Hipparchus , ora Ptolomy, would lie under, who had no- 
 thing but the Eye of Reafon to direCt them, in Oppofition to the Judg- 
 ment of a Brahe, ora Galilceus, who reaped fo much Benefit from their 
 compound Opticks ? But on the other hand, perhaps if the folar Syftem, 
 was the Topic of Difcourfe, a * Pythagorean might very pertinently fay 
 to a Newtonian, “ You have not gone much farther in the Light wkh our 
 “ Direction, than we did in the Dark alone ; for you are flill roving 
 ** round the fame Circles.” Much might be faid upon this Head but 
 I believe it would be a difficult Matter to do Juflice to all Parties: So here 
 I intend to leave them, only muftobferve, that Poflerity will always have 
 the Advantage over their Predeceflors ; and that After-ages, in all Pro- 
 bability, will reap fo great a Benefit from the Invention and Improve- 
 ment of Fluxions, that fcarce any thing, which is the immediate Ob- 
 ject of fuch Enquiry, will long lie concealed from a true mathematical 
 Genius. 
 
 For this, in which he has furpaffed all the Antients, and greatly advanced 
 the philofophical Sciences, the World is indebted to Sir Ifaac Newton. 
 
 But as many of his Difcoveries, fuch as relate particularly to the Laws 
 of the planetary Syftem, are but as fo many Confirmations of the Con- 
 jectures and Imaginations of Aftronomers and Philofophers before him, it 
 perhaps will not be amifs to acquaint you a little with the Aftronomy of 
 the Antients concerning the Univerfe. And before I proceed to thofe of 
 my own, fhew you in the firft Place how far their Speculations in the vi- 
 fible Creation have been carried ; and with thefe I fhall conclude this pre- 
 paratory Epiftle. 
 
 The Univerfe, or mundane Space, by which the Antients comprehend 
 all Creation, has, from time to time, according to the Progrefs of Science, 
 come under a fort of Neceffity of being varioufly modell’d agreeable to the 
 
 Opinion 
 
 * The true Syftem of the Planets have been difcovered above two thoufand Y ears. 
 
i 4 LETTER the SECOND, 
 
 Opinion of the feveral Authors, who have judged themfelves wife 
 enough to write upon it with a mathematical Foundation : And the cof- 
 mical Syftem, by which is meant the Co-ordination of its conftituent 
 Parts has undergone almoft as many Changes as its Elements are even ca- 
 pable of ; every Age of the World, as Knowledge has increafed, either 
 from improved Imagination, or repeated Obfervations, producing fome- 
 thing new concerning it. 
 
 Milton, no doubt, had all this Diverfity of Opinions in View, as 
 appears from his fuppofed Pre-knowledge of Raphael in the following 
 Paflage, Book. VIII. 
 
 Hereafter, when they come to model Heaven, 
 
 And calculate the Stars, how they will weild 
 The mighty Frame ! how build, unbuild, contrive 
 To fave Appearances, how gird the Sphere 
 With centric and eccentric fcribbl’d o’er j 
 Cycle, and Epicycle, Orb in Orb, 
 
 But the following Synopfis, I believe, will abundantly convince you 
 that from certain Obfervations only, we ought to form all our Notions of 
 it, if we either hope to arrive at Truth, or expedl our Ideas fhould be 
 fupported by Reafon. 
 
 Aristotle was of Opinion, that the Univerfe, or Heaven, was all 
 one World, and St. Chrysostom, Tertullian, St. Bonaventure, 
 Tycho Brahe, Longomontanus, Kepler, Bulialdus and Tellez, 
 were of an united Opinion, that this one Heaven, or Univerfe, was all 
 fidereal and fluid. But Aegidius, Hurtadus, Cisalpinus, and Aver- 
 sa, believing the fame Heaven with them to be all one World, and that 
 fidereal, yet on the contrary held it to be folid. 
 
 Clemens, Acacius, Theodoret, Anastasius, Synaita, Pro- 
 copius, Suidus, S. Bruno, and Claudianus Mamertus, fuppofed 
 theuniverfal mundane Space as divided into two Heavens, namely, 
 
 The Empyrasum created thefirft Day, 
 
 And the Firmament created the fecond Day. 
 
 Two Heavens were alfo held by Justin Martyr, the one fidereal, 
 and the other aerial. The firfl: fuppofed by St. Gregory Nyssene, to be 
 that of the fixed Stars, and the lafl, that of the Planets. But Majlrius 
 and Bellutus , though agreeing in the Number of Heavens, call one the 
 Rrimum Mobile , , and the other, the Starry Heaven. 
 
 Farther, 
 
LETTER the SECOND, r 5 
 
 Farther, St. Basil, St. Ambrose, Damascene, Cassiodorus, Ge- 
 
 NEBRARDUS, SUAREZ, TANNERUS, HuRTADUS, OviE-DUS, TeLLEZ, 
 
 and Borrus, difiinguilhed the Univerfe as divided into three Portions, 
 or Heavens. 
 
 The firfi: called the Empyraeum, 
 
 * 
 
 Watery, 
 
 N. 
 
 
 The fecond fuppofed Sidereal, 
 
 
 v3 
 
 • 5 
 
 Sidereal, i. 
 
 Watery, 
 
 And the laft of all, Aerial. 
 
 <8 
 
 r\ 
 
 Urn 
 
 n 
 
 Aerial, £ 
 
 Sidereal. 
 
 Again, St. Athanafius adds to thofe of the fix’d Stars, the Planets, and 
 the Air, that of the Empyrreum^ and makes in all four Heavens. 
 
 But as the Number of the Heavens thus increafes, and will become 
 fubdivided in the fubfequent Account of them, to give you a better Idea 
 of the Order of thefe celeftial Portions of the mundane Space, it will 
 not be amifs to form what remains of them into regular Sections of their 
 proper Spheres and Syftems. 
 
 See Plate III. in which Figure, the firfi: reprefents a Section of the 
 cofmical Theory of Oviedus and Ricciolus : Both confifting of five Hea- 
 vens, viz . 
 
 The fixed Stars, A Empyrceum^ - - G 
 
 .| Saturn , ------B*|ea The Water, - - F 
 
 •5 * Jupiter , - - - - - C.§1 The fixed Stars, A 
 
 ^5 Sol , with d", 5 and $ included D The Planets, - H 
 
 The Moon. - - - - E The Air. - - I 
 
 Fig. II. reprefents that of venerable Bede and Rabanus , viz. of 
 Heavens. 
 
 And according to Bede compofed of 
 
 The Air, - - — - - P 
 
 The ./Ether - - - - O 
 
 Olympus , - - - - - - N 
 
 The Element of Fire, - - - M 
 
 The Firmament, - - - - A 
 
 The Angelical Region, L 
 
 Realm of the Trinity. - K 
 
 Seven . 
 
 But by Rabanus , 
 
 The Atmofphere, 
 
 The upper Air, 
 
 The inferior Fire, 
 
 The fuperior Fire, 
 
 Sphere of the fixed Stars, 
 
 The Chryftalline Heaven* , 
 
 The Empyrceum. 
 
 Fig> 
 
16 LETTER the SECOND. 
 
 Fig. III. Reprefents the Hypothefesof Eudoxus , Plato , Calippus, Cicero , 
 Riccius , Philo , RemigiuSy Aben-Ezray CarthufianuSy Lyranus, FoJlatuSy Bru- 
 genfiSy OrontiuSy CremonijiuSy Philalethaus, Amicus, and Ruvius ; alfo the 
 Babylonians and Egyptians. 
 
 Confiding of Eight Heavens, 
 
 All Sidereal, viz. The Sphere of the fix’d Stars, and thofe of the Se- 
 ven Planets. 
 
 Fig. IV. is that of MacrobiuSy Haly Alpetragius y Rabbi-Jofue, Rabbi 
 MoyfeSy Scot us, Abraham Zagat us , Sacrobofcns, Claromontius , Avigra , 
 and Arraiga. 
 
 All of Nine Heavens, 
 
 Comprehend a Primum Mobile or, according to Arriaga , a folid 
 Empyrceum. The Sphere, of fixed Stars A, and the feven Regions of the 
 .folar Planets. 
 
 Fig. V. is that of the great Alphonfus , Fernelius , Regiomontanus , 
 
 • micus , Maurolycus and Langius ; alfo of Azahel, Fhebit , and -ZJfozc T/Ez- 
 <?///£ ; and likevvife of Gulielmus Parifienfis , and Johannes Antonius 
 Delphinus. 
 
 Confiding of Ten Heavens, made up of 
 
 A Primum Mobile — * — S Empyraum. 
 
 A Sphere of Tripidation in Longitude — R Primum Mobile. 
 The Sphere of the fixed Stars — — A 
 
 And thofe of the feven folar Planets within. 
 
 Note, Some Authors place the Sphere of Tripidation in Longitude be- 
 low that cf the Aplain, or Eighth Sphere. 
 
 Laftly, Fig. VI. is the Heaven of Petrus Alliaccnjis, the College of Conim- 
 bra, Martinenjis, (and fometime) of Clavius ; and alfo Johannes Warnerus , 
 ■Leopoldus de Aujlrid , Johannes Antonius Maginus j and ladly, of Clavius. 
 
 In all Eleven Heavens containing, 
 
 T A Primum Mobile , or, as .others fay, an Empyraim. 
 
 V A Sphere of Libration in Latitude. 
 
 W A Sphere of Libration in Longitude. 
 
 A The Sphere of the fixed Stan, and thofe of the Planets. 
 
 Thus you fee how many various Opinions have from time to time 
 been imbraced concerning the Fabric and Formation of the vifible Uni- 
 verfej all of which are now and have long been exploded ; and although 
 at fird advanced by Men of the greated Learning, and of the deeped Pe- 
 netration in natural Knowledge, it does not appear from any one of their 
 Opinions, that they had any the lead Notion of infinite Space, but as it 
 
 were 
 
LETTER the SECOND. I7 
 
 were confined the Divine Being to their limited Notions, as one may 
 fay in anEgg-fhell. If therefore what I lhall hereafter advance, extend io 
 far without the known Creation, that you can pofiibly conceive no Bounds 
 to the Works of infinite Wifdom and Power, I hope you will be in no 
 Danger of looking upon it as more ridiculous, or abfurd, than what fo 
 many of the wifeft Men of every Age have thought proper to attempt, 
 and have judged worthy of their Attention fo long before me. If any thing 
 lefs fo, I fhall think myfelf happy enough in having broke, or rather pal- 
 fed the narrow Limits to which the Creation has for fo many Years 
 been confined, in hopes of tempting Men of greater Talents to look up 
 wards, and purfue fo noble a Subjedt as far as the human Underfiandin^ 
 is capable of comprehending it. 
 
 To the Opinions above might be added many more, particularly that 
 of ’Johannes Baptifta Turrianus , and Fracajlorius , who increafed the Num- 
 ber of Heavens to fourteen, viz. feven on each Side the Aplane . 
 
 But of this I have faid enough } in my next I (hall proceed to Matter 
 better grounded, 
 
 And am, &c. 
 
 D 
 
 letter 
 
( i8 ) 
 
 LETTER the THIRD. 
 
 Concerning the Nature , Magnitude , and Motion of the Planetary Bodies 
 
 round the Sun , & c. 
 
 SIR, 
 
 T H E younger Pliny , if I remember right, fomewhere fays, that 
 there is, or ought to be, a wide Difference betwixt writing to a 
 Friend, and writing to the Publick : I have indeed pleafed my- 
 felf with the one, but am far from thinking myfelf qualified for the other j- 
 I muff therefore rather intreat you, though perhaps you cannot poffibly 
 overlook all my Faults as an Author, to excufe them at leaft in the Friend, 
 and by fuch kind of unlimited Indulgence, you will give me a much grea- 
 ter Chance to do the Subjedt fome Juftice, though I own I defpair in this 
 firft Attempt, to reconcile every thing I advance to yftur more cool and 
 impartial Reafoning. But to the Bufinefs : 
 
 As I have no Ambition to have the Subftance of my Theory more ad- 
 mired by you than underftood, which is too often the Cafe in Works of 
 this Nature, I muff beg leave to repeat to you Part of a former Dif- 
 courfe, which will refrefh in your Ideas the principal Laws of the Syftem 
 of our Sun, and make you properly acquainted with fuch Things as are 
 neceffary to be known in the now-eftablifhed Aftronomy of * Copernicus , 
 &c. before I proceed to any new Matter. 
 
 The 
 
 * Nicolaus Cop ernicus, fiiled by Bulialdus, Vir abfoluta fubtilitatls , was a Native 
 of Thorn in Polijh Prujfia , and Canon of the Church of Frawenburgh ; he was Scholar to Domi- 
 nicus Maria of Ferrara , to whom he was Afiiftant in his aflronomical Obfervations at Bolognt , 
 and Profeftor of the Mathematicks at Rome, in his noble Work, De Rewlutionibus Orbium Ca- 
 lejlium ; he fortunately revived, happily united, and formed into an Hypothecs of his own, the 
 feveral Opinions of Philolaus , Heraclides Ponticus, and Ecphantus Pythagoreus , viz. after 
 the Opinion of Philolaus he made the Earth to move about the Sun, as the Center of its an- 
 nual Motion ; and according to Heraclides and Ecphantus , he likewife gave it a diurnal Ro- 
 tation round its own Axis : Which Syftem has withftood all Oppofition ; and as Ricciolus , 
 (though a Difienter from it) obferves, Per damna , per cades , ab ipfo fumit opes , animumqut- 
 ferro. 
 
LETTER the THIRD. 19 
 
 The Sun, you are not to learn, is the reputed Center of our Planetary 
 Syflem , and may remember, that the Earth on which we live, and thefe 
 five following Erratic Stars y viz. Saturn, Jupiter, Mars, Venus and 
 Mercurv, have been demonftrated to move round him in the Order 
 and Manner following. 
 
 Saturn is found to complete one Revolution round the Sun in twenty- 
 nine Years, one hundred and feventy-four Days, fix Hours, and thirty-fix 
 Minutes; at the Diftance of about feven hundred and feventy-feven 
 Million of Miles. 'Jupiter performs a like Revolution in about eleven 
 Years, three hundred and feventeen Days, twelve Hours, and twenty 
 Minutes; diftant from the Sun about four hundred and twenty-four Mil- 
 lions of Miles. Mars compleats his Circuit in one Year, three hundred 
 and twenty-one Days, twenty-three Hours, and twenty-feven Minutes ; 
 and his mean Diftance is about one hundred and twenty-three Millions of 
 Miles. 
 
 Thefe three are called fuperior Planets, as being farther from the Sun 
 than the Earth, and circumfcribing its Orbit. 
 
 The Earth circumambiates her Orbit in one folar Year, viz. in three 
 hundred and fixty-five Days, five Hours, forty-eight Minutes, and fifty- 
 feven Seconds ; at the mean Diftance of eighty-one Million of Miles. 
 
 The Radius of Venus ' s Orbit is about fifty-nine Millions of Miles ; and 
 that of Mercury nearly thirty-two Millions, ditto. 
 
 The Heliocentric Revolution of Venus , is made in two hundred and 
 twenty-four Days, fixteen Hours, forty-nine Minutes, and twenty-feven 
 Seconds ; and that of Mercury , in eighty-feven Days, twenty-three Hours, 
 fifteen Minutes, and fifty-four Seconds. Thefe two laft Planets are called 
 inferior Ones, as being circumfcribed by the Earth. 
 
 The Diameter of the Sun being demonftrated to be nearly feven hun- 
 dred and fixty-three thoufand Miles : 
 
 The proportional Magnitudes of all the above Planets will be found 
 nearly as follows, viz. 
 
 Of Mercury 
 Venus 
 the Earth 
 Mars 
 Jupiter 
 and Saturn 
 
 The Diameter of the Globe, 
 
 - - 4,240^ 
 
 - " 7>9°° I 
 
 ’ ’ 7 V°S M > ies ' 
 
 4.44° 
 
 4>44 u I 
 
 81.000 1 
 
 61.000 J 
 
e,©. LETTER the THIRD. 
 
 Thus much I have thought proper to premife, and for your immediate 
 InfpeCtion, have added the following Schemes, that nothing may be want- 
 ing to give a general Idea of the Order of the celeftial Bodies in our own 
 Syftem, before I attempt to lead you through the neighbouring Regions of 
 the Stars to the more remote Trails of Infinity.. 
 
 PLATE IV. 
 
 Is a true Delineation of the Polar Syftem, with the Trajectories of three 
 of the principal Comets, whofe Periods and Orbits have been accurately 
 determined, and are reprefented in their true Proportion and Pofition to 
 one another, and the Order of the Planets round the Sun, marked with 
 their refpeCtive Characters, viz. T? , for Saturn, % , 'Jupiter, d", Mars, ®, 
 the Earth, 5, Venus, and 5, Mercury. The Scale being nearly five hun- 
 dred and eighteen Millions of Miles to an Inch. 
 
 PLATE V. 
 
 Is a true Projection of the Syftem of the known Comets ; in which are* 
 reprefented nine of the chief Trajectories, from their Aphelii to their Pe- 
 rihelii , all in juft Proportion and Pofition to the Orbits of Saturn and 'Ju- 
 piter , which are alfo reprefented by the two concentric Circles, fuppofed 
 to be drawn round the Sun as their Center. 
 
 The Ellipfis, or Trajectory, marked A, fhews- the Pofition and Path- 
 of the Comet which appeared in the Year 1684, whofe Period is fuppofed 
 to be about fifty Years, and has been obferved within the Region of the 
 Planets once. 
 
 That mark’d B, is the Way of the Comet of 1682 ; 
 
 The Period conjectured to be about feventy-five 
 Years and a half, and has been obferved thrice. 
 
 C, Way of the Comet of 1337 ; 
 
 The Period about 100 Years, obferved once. 
 
 D, That of the Comet of 1661 j 
 
 The Period about 1 29 Years, obferved twice. 
 
 E, TraCt of the Comet of 1618 j 
 
 The Period about 160 Years, obferved once. 
 
 F, Way of the Comet of 1677 $ 
 
 The Period about 200 Years, obferved once. 
 
 G, Way of the Comet of 1744 ; 
 
 The Period about 300 Years, obferved once. 
 
 H, . Way of the Comet of 1665 } 
 
 The Period about 400 Years, obferved once. . 
 
 I, Way of the Comet of 1680 j 
 
 The Period about 575 Years, obferved thrice. 
 
 The 
 
21 
 
 LETTER the THIRD. 
 
 The Scale of this Syftem is equal to one Third of the former. 
 
 Here 1 muft oblerve to you, as a Thing I judge may prove of great Con- 
 fequence with regard to the Syftem of Comets, which is as yet very im- 
 perfect : That I am ftrongly of Opinion, that the Comets in general, 
 through all their reipe&ive Orbits, defcribe one common Area, that is to 
 fay, all their Orbits with regard to the Magnitude of their proper Planes, 
 are mathematically equal to one another; which, if it once could be proved, 
 and confirmed by Obfervation, the Theories of all the Comets that have 
 been juftly obferved, might eafily be perfected, and their Periods at once 
 determined, which now we can only guefs at, or may wait whole Ages for 
 more Certainty of. What leads me to believe, that this may prove to 
 be really the Cafe is this. 
 
 I find by Calculation, that the Orbits of the two laft Comets, whofe 
 Elements have been molt corre&ed by Sir Ifaac Newton and Dr. Hally , are 
 to one another, according to their Numbers, nearly as * 13 to f 17, 
 notwithftanding one of them is one of the moft erratick that ever came un- 
 der our Obfervation 3 and the other one of the mod: neighbouring to the 
 Sun. 
 
 But it is well known to all Mathematicians, that the firft of thefe Co- 
 mets moved in fo eccentric a Trajectory, that the lead; Error in its almoft 
 incredible Proximity to the Sun will produce a very fenfible Difference 
 in the Area of the Orbit: And accordingly, if we moderate the Pe- 
 rihelion Diftance of this Comet, by making it but 1000 inftead of 
 ^ 612, which is but increafing it a Part of the great Ra- 
 
 dius of the Orbit, (which is an Error every Aftronomer will readily 
 grant is very eafily made) and we (hall find the Orbits of the faid two 
 Comets to be exactly equal. 
 
 Further, I muft inform you, that the Comet of 1682, which the above 
 compared with, feems to have been fo accurately obferved, that it does 
 not appear to have altered its Perihelion Diftance half a 68th Part in one 
 intire Revolution. Now, if we can with any Show of Reafon, and a 
 Probability on our Side, bring the Areas of thefe two extream Comets, 
 as I may call them, to an Equality , fure we may conclude, it is a Subject 
 highly worthy to be more confidered and enquired into. 
 
 PLATE 
 
 * 1316539,968282 Comet of 1680. . 
 f 1708155,4644 Comet of 1682. 
 
 % The Number in Dr. Hally's Synopfis. 
 
22 
 
 LETTER the THIRD. 
 
 PLATE VI. 
 
 Is a true Reprefentation of the fatellite Syftems, proportionable to one a- 
 nother, and to the Orb of the Sun’s Body, that a juft Idea of the Diftances 
 of thofe fecondary Planets, may be eafier had from their refpeCtive primary 
 ones. 
 
 S reprefents the folar Body with its Atmofphere. Fig. i. is the Syf- 
 tem of Saturn from the fame Scale. Fig. 2. that of 'Jupiter from 
 ditto. And Fig. 3. the Orbit of the Moon round the Earth, in the fame 
 Proportion. 
 
 But as you can have but a very imperfeCt Idea of the Magnitude of thefe 
 laft Circles, with regard to the Body of the Earth or Moon, 
 
 PLATE VII. 
 
 Is a true Projection of their real Globes, at their proper Diftance from 
 each other, with their common Center of Gravity, and the Point and 
 Line of equal Sufpenfion betwixt them, viz. 
 
 A, reprefents the Globe of the Earth. 
 
 B, that of the Moon. 
 
 C, Point, and C D, Line of equal Sufpenfion betwixt them. 
 
 E, Common Center of Gravity, which defcribes the Orbis Magnus. 
 
 E, F, and B, G, is the Orbit of the Moon. 
 
 Farther, that nothing may be wanting to give a true Notion of the 
 whole together, 
 
 PLATE VIII. 
 
 Is a proportional* Drawing of all the primary and fecondary Planets to- 
 gether, diftinguifhed by their Characters, proper to attend a Globe of 
 twelve Inches Diameter, fuch a one being fuppofed to reprefent the Sun. 
 
 PLATE IX. 
 
 Is an exaCt Scheme of the principal known Comets, in juft Proportion, 
 to the Globe of the Earth reprefented at A, with the Nuclus, and Part of 
 the T 'ail of the Comet of 1680, B, as it wasobferved in its Aflent from the 
 Sun , viz. a a the Comet’s natural Atmofphere, z z z, the Denfer Matter 
 winding itfelf into theAxis of the Train x x> the inflam’d Atmofphere and 
 Tail dilated near the Sun. C, reprefents the Ball of the Comet of 1682, 
 D, that of 1665, E, that of 1742, and F, the Head of the Comet of 
 
 1 744 * 
 
 And again, that you may have fome Notion of the apparent Magnitudes 
 of all thefe Planets and Comets, &c. as they appear at the Earth, 
 
 PLATE 
 
LETTER the THIRD. 
 
 € 
 
 2 3 
 
 V • 
 
 PLATE X. 
 
 Reprefents the San and Moon in the juft Proportion of their mean Dia- 
 meters, with two of the Comets A and B, and the five erratick Planets, as 
 they are obferved at the Earth, in a middle State of their Diftances from it. 
 
 Fora more full and particular Defcription of all the Parts of the folar 
 Syftem, and of the home Elements of Aftronomy in general, I refer you 
 to my Clavis Ccele/lisfac. where every thing concerning the Planets, Comets, 
 and Stars ; and their real and apparent Motions, are at large reprefented, 
 explained, and accounted for, for the Benefit of fuch as have not made 
 the Mathematicks their regular Study. 
 
 Now, to convince you that the Planets are all in their own Nature no 
 other than dark opaque Bodies, reflecting only the borrowed Light of 
 the Sun, I muft recommend to your Obfervation, this natural and Ample 
 Experiment, which almoft any Opportunity of feeing the Moon a little 
 before the Full, will put into your Power to make but belt and eaiieft 
 when the Sun is in any of the North Signs, i. e. in Summer. 
 
 At fuch a time, the Sun being near fetting, the Moon will appear in 
 the eaftern Hemifphere j and if there be any bright Clouds northward, 
 or fouthward near her, you will plainly perceive, that the Light of the 
 one is of the fame Nature with that of the other j I mean the Light of 
 the Moon, and that of the Cloud. To me there never appeared any Dif- 
 ference at all j and I am perfwaded, were you to make but two or three 
 Obfervations of this kind, which is from Nature itfelf, a fort of ocular 
 Demonftration, you cannot fail of being convinced, that the Moon’s 
 Light, fuch as it is, without Heat, can poflibly proceed from no other 
 Caufe than that which illumines the Cloud : For if the Clouds, whofe 
 Compofition we know to be but a thin light Fluid, formed of condenfed 
 Vapours only, is capable of remitting fo great a Luftre, how much more 
 may we not allow the Moon, which, Length of Time, and many other 
 Circumftances, have long confirmed to be a durable and folid Body. 
 
 The Increafe of her Luftre, indeed, during the Abfence of the Sun 
 from us, to a lefs penetrating Genius than your’s, may poflibly afford 
 fome trifling Ground of Objection to the above Conclulions, as being 
 drawn from the Pbasnomena of Day-light only ; by reafon in the Night, 
 we have no Clouds in equal Circumftances to compare with her. 
 
 But this I need not tell you, is all owing to her being feen through a 
 darker Medium, and not to any real Increafe of natural Light emitted 
 from the Sun. As a Proof of which, were it neceflary, you need only, 
 (hut out the Rays of the Atmofphere, by the Help of a fufficiently 
 
 long 
 
24 LETTER the THIRD, 
 
 long Tube; and the Moon, or any other celeftial Body, will appear 
 through it, as bright in the Day-time as in the Night. 
 
 Thus all light Bodies of inferior Luftre, whether fhining by their own 
 natural Radiences, or by a borrowed Refle&ion, partake of the fame Ad- 
 vantage, when removed from the more potent Influence of a fuperior one ; 
 and hence it is, that the *Aura JEtherea fhines out moft manifeft, when 
 the Body of the Sun himfelf is hid, the Stars, and the Via Lattea moft 
 .lively and numerous in the Abfence of the Moon, and thofe Exhalations, 
 or Meteors, vulgarly called Falling-ftars, become only vifible (like 
 Glow-worms) in the Night. 
 
 Here it may not be improper to tell you, that the Clouds are to us in 
 effedt no other than as fo many Moons, whereby we have our artificial 
 Day prolonged to us feveral Hours after the Sun is fet, and likewife pro- 
 duced as much fooner before he rifes ; and were they to afcend by ftill 
 ftronger Power of Exhalation to an Elevation, all round the Atmofphere, 
 fo as to form a Sphere equal to four Times the Globe of the Earth, there 
 would then be no fuch Thing as real nodlurnal Darknefs to any Part of 
 the World. 
 
 The lunar Light then we may very juflly conclude, proceeds originally 
 from the Sun : And notwithftanding many more Arguments might be 
 drawn from the Demonftration of her Phafes, Eclipfes, &c. to prove it, 
 yet none of them need here be added, to what has been already faid, to 
 convince you of the Truth of it. This being granted, let us now confider 
 what Effed: this, or a like Quantity of borrowed Light, would have, 
 when removed to a much greater Diftance. 
 
 I may, I think, fuppofe, that you know fo much of Opticks as to un- 
 derhand, that all vifible Objects apparently decreafe in Magnitude, as their 
 Diftance from the Eye increafes. Confequently, that, if the Moon’s Orbit 
 was placed as far again from the Earth as it really is, her Globe, or rather Dijk, 
 would then feem to be but half as big as to us ftie now appears to be, and 
 of courfe ftill farther, were fhe placed at ten times the Diftance fhe-is 
 ■known to revolve at, her apparent Diameter would be reduced to a tenth 
 Part; only of what it now appears to be in her prefent Orbit, that is, one 
 hundred Times lefs in vifible Magnitude than her neighbouring Dilk is 
 found to be where it now is feen. And fuch, but fomething lefs, the two 
 Planets Venus and Jupiter , which are frequently, in their Turns, our 
 Morning and Evening Stars, appear to be through a common Telefcope. 
 
 Now 
 
 * An Helios, or golden Light, always attending the Sun, and fuppofed to fpread itftlf ?H 
 round his B dy in the Diredtion of h-is Equator, was very vifible during the total Darknefs of 
 _the Echpfc of 17x5, and may be always feen about the Autumnal Equinox. 
 
LETTER the THIRD, 25 
 
 Now thefe two Planets, together with the other three, which we find 
 moving in regular Orbits round the Sun, are all found fubjed to the fame 
 * Changes of Phcz?jomena t in their various Afpeds with the Sun j and who 
 can doubt but that they are all of the fame or like Nature ? But you’ll fay, 
 perhaps, how are we fure that Venus and "Jupiter have no native Light of 
 their own, fince many of the ancient Philofophers, and in particular 
 Anaximander , allowed even the Moon to have fome ; and befidef, in Phi- 
 lofophy, as well as in Logick, I think you hold there is no proving a Ne- 
 gative, at lead at fuch a Diftance. 
 
 To make you conceive the Impoflibility of fuch a Light, and next to a 
 Demondration, convince you of the Unnaturalnefs of fuch a Suppofition, 
 I mud put you in mind, that fome time ago, when I was lad in the Coun- 
 try with you, I think it was about the latter End of Autumn, near the 
 Winder Solftice, as we were walking one Evening, I bid you take no- 
 tice of the Moon, which was then near fetting, and about two Days old. 
 You may remember, her whole Giobe appeared to us very confpicuoufly 
 within a manifed Circle. You immediately told me, that that kind of Phe- 
 nomenon the Country People called a Stork , or the old Moon in the new 
 one’s Arms. This I then endeavoured to explain to you, and I think 
 made you fenfible it was intirely an E fifed: of the Earth’s, and an Appear- 
 ance always to be expeded at that Time of the Year. The Earth being 
 then in the State of a Full-Moon to that Part of the lunar Orbit, and near 
 her Perihelion, at which time, the Earth fends back a Refledion to the 
 f Moon twenty-five times more potent than that of the Moon to us. 
 
 Now the Planet Venus , from undeniable Principles of Geometry, is 
 allowed to be nearly fuch another Globe as the Earth is 5 and fince the 
 Earth, as I have jud now related, is found to refled much more Light to 
 the Moon, by reafon of her fuperior Magnitude, than the Moon can poflibly 
 reverberate to Earth again j and fince alfo ’tis plain, the Earth has no 
 Light of its own, why then fhould we imagine Venus to be endowed with a 
 Ludre, which we can prove to be no more than a fimilar Body, and go- 
 verned by the fame Laws as the Earth is ? 
 
 Anaximander s Midake, in fuppofing the Moon in fome fmall Degree 
 a radiant Body of itfelf, lay, in not confidering, that the faint Illumination 
 here defcribed, and vifible all over her Globe, foon after almod every 
 Conjundion with the Sun j and probably in Eclipfes, alfo proceeded from 
 the Earth ; but the thing I think is too evident to exped any fort of Con- 
 
 E tradidion, 
 
 VenUs and Mercury in every Heliocentrick Revolution, perform all the Changes of our 
 Moon in a like Gradation and Defe&ion of Light, both horned and gibos’d. 
 
 _ f Their Diameters being nearly as 1 to 5. 
 
26 LETTER the THIkD. 
 
 tradition, therefore I hope you will admit it as a Truth, and confequentljr 
 take it for granted, that the planetary Bodies in general, are meer terres- 
 trial, if not terraqueous Bodies, fuch as this we live upon j which is 
 the Thing I have chiefly in this Letter attempted to demonftrate, or 
 have rather explained j and now 1 hope, for the future, you will receive 
 the Idea of a Plurality of Worlds more favourably, and look upon aftro- 
 nomical Conjectures in a lefs ridiculous Light than you ufed to do, efpe- 
 cially fince you muft allow, they give our unlimited Imaginations a like all 
 endiefs Field of Contemplation, not only full of the wonderful Works of 
 Nature, but alfo of a vifible Providence. 
 
 I think I cannot conclude this Letter to you more properly, than with 
 the following fine Lines of Mr. Addifon ' s from the Spectator, Vol. VI. 
 No. 465. which I hope you are not fo polite as to look upon as an un- 
 falhionable Quotation. 
 
 The fpacious Firmament on High, 
 
 With all the blue ethereal Sky, 
 
 And fpangl’d Heav’ns, a Ihining Frame, 
 
 Their great Original proclaim : 
 
 Th’ unwearied Sun, from Day to Day, 
 
 Does his Creator’s Pow’r difplay, 
 
 And publifhes to ev’ry Land 
 The Work of an Almighty Hand. 
 
 Soon as the Ev’ning Shades prevail. 
 
 The Moon takes up the wond’rous Tale, 
 
 And nightly to the lift’ning Earth, 
 
 Repeats the Story of her Birth : 
 
 Whilftall the Stars that round her burn, 
 
 And all the Planets in their Turn, 
 
 Confirm the Tidings as they roll, 
 
 Andfpread the Truth from Pole to Pole. 
 
 What though, in folemn Silence, all 
 Move round the Dark terreftrial Ball ? 
 
 What tho’ nor real Voice nor Sound 
 Amid their radiant Orbs be found ? 
 
 In Reafon’s Ear, they all rejoice. 
 
 And utter forth a glorious Voice, 
 
 For ever finging, as they fhine, 
 
 “ The Hand that made us is divine.” 
 
 And am. Seel 
 
 LETTER 
 
[ *7 ] 
 
 V 
 
 LETTER the FOURTH. 
 
 Of the Nature of the heavenly Bodies continued , with the Opinions of the 
 Antients concerning the Sun and Stars. 
 
 SIR, 
 
 Y O U tell me you begin to be a tolerable good Coper nican, and 
 would now be glad to have my Opinion further upon the Nature 
 of the Sun and Stars, with regard to the Suggeftion of their being 
 like Bodies of Fire. This you fay will go a great Way towards confirm- 
 ing you in the Notion you have begun to embrace of a Plurality of Sy- 
 ftems, and a much greater Multiplicity of Worlds than our little folar Sy- 
 ftem can admit of. Befides, (hewing in a very evident Light, that the 
 Authorities cited in my firft Letter are founded upon the cleared; Reafon. 
 
 Anaxagoras, you fay, believed the Sun to be a Lump of red-hot Iron ; 
 "Euripides thought it a Clod of Gold j and others (till more ridiculoufly 
 have imagined it to be a dark Body, void of all Heat. That the Sun is 
 a vaft Body of blazing Matter, notwithftanding the various Opinions of 
 thofe primitive Sages, will, I think, hardly admit of a Queftion : Since the 
 known Warmth of his prolifick Beams, and the vifible Effedl of the Burn- 
 ing-glafs, puts it quite out of the Power of our prefent Set of Senfes, at 
 lead to argue againft it; and how reafonably we may imagine the Stars to 
 be all of the fame or like Nature, will fufficiently appear from thefe fol- 
 lowing Confiderations : Firft, it is well known to all Mathematicians, that 
 any vifible Qbjed of any determined Magnitude may be reduced to the 
 Appearance of * aphyfical Point, by removing the Eye of the Obferver to 
 a proper or proportionable Diftance from it, within the finite View : And 
 that the apparent Diameter of every luminous celedial Body, will always 
 be dimimffied reciprocally, in Proportion to the Diftance from the Eye, 
 till they become altogether imperceptible. 
 
 E 2 Thus 
 
 * What is here meant by a phyfical Point, is a Point vifible to the naked Eye, which hu- 
 man Art cannot divide; and fo far it partakes of the Property of a mathematical one, which is 
 only to be conceived, and not fee n. 
 
28 
 
 LETTER the FOURTH. 
 
 Thus the Diflc of the Sun, which appears to us at Earth under an Angle 
 of about half a Degree, iffeen from the Planet Saturn , would appear not 
 much bigger than the Planet Venus or Jupiter , in their mod neighbouring 
 Vicinity does to us ; and confequently to an Eye placed in the Aphelion 
 Point of the Orbit of the great Comet of 1680, his apparent Diameter 
 would be fo reduced as to feem but little bigger than the larged: of the 
 Stars ; and by the fame Analogy, or Way of Reafoning, admitting Space 
 and Didance infinite, which I humbly apprehend is not to be difputed^ 
 were all the Matter in the Univerfe united, and conglobed in one Mafs, 
 with refpedt to ocular Senfation, it might be diminifhed fo near to a ma^ 
 thematical Pundtum, as to be almoft adequate to our Ideas of Nothing. 
 
 This to any tolerable Optician, mud be an evident Convidtion of the 
 Truth of the modern Adronomy, which now univerfally allow all thofe 
 radiant Bodies the Stars to be of the fame Nature with the Sun ; and that 
 as certainly they are no other than vad Globes of blazing Matter, all un- 
 doubtedly fhining by their own native Light. 
 
 But as you have often objedted to what has been faid of the Didance of 
 the Stars in general, and may poflibly from aSuppofition, that they are, or 
 may be, much nearer to us, infer, that their Light, like that of the Planets, 
 may be alfo borrowed from the Sun, or from fome other radiant Body, 
 which, from the Nature of the Suppofition, mud of Confequence be in- 
 vifible to us, I judge it will not be amifs to throw a few demondrative Ar- 
 guments in your Way, in order to lead you a little out of the Path of 
 an early Prejudice, and draw you as it were by Degrees through the Dawn 
 of adronomical Reafoning, out of your original Error, and refcue your 
 Imagination from the falfe Notions imbibed from Phenomena only in 
 your younger Years. This I guefs cannot fail of reconciling you to this 
 more rational Way of Thinking, and make you acquainted with 
 Truths of much Confequence, which perhaps you have yet been an intire 
 Stranger to. The grand Deceptio Vifus , which I mud fird endeavour to 
 remove, and which as a fort of Paradox in Nature, has, as I may fay, im- 
 prifoned the Underdanding of many fuperficial Reafoners, and in general 
 all incurious Men, is this. 
 
 Mod People are too apt to think originally, that as the Heavens appear 
 to be a vad concave Hemifphere, that the Stars mud of courfe, as of 
 Confequence, be fixed there, like fo many radiant Studs of Fire, of various 
 Magnitudes; and take it for granted, chiefly defigned for no other 
 Purpofe than to deck and adorn the Canopy of our Night. This was long 
 ago the Opinion o{ Thales the Milejian } and wants not the Authority of 
 
 many 
 
LETTER the FOURTH. 2^ 
 
 many of the Antients to back it. Others, in particular * Ptolomy of Pe - 
 lufmm in Africa , who from his Experience in this Science, is called by 
 fome the Prince of Aftronomers, believed them to be Loop-holes in the 
 vail: folid celeftial Firmament, emitting the Light of the Cryflalline Hea- 
 ven through it to all within it. The famous Diogenes , Cotemporary 
 with Plato , conceived them to be of the Nature of Pumice-Hones, and in- 
 clined to an Opinion, that they were the Spiracula , or Breathing-holes of 
 Heaven. Anaxagoras thought them Stones fnatched up from the Earth 
 by the Rapidity of its Motion, and fet on Fire in the upper Regions 
 above the Moon. 
 
 But how ridiculous and abfurd all thefe Opinions and Conjectures really 
 are, will ealily appear, if we but once confider the Nature of an un- 
 bounded y£ther, and the amazing Property of infinite Space. 
 
 This, with what has been faid before, will not a little affift your Ima- 
 gination towards conceiving the Reafonablenefs of the Notion modern 
 Aftronomers are now confirmed in, of their being abfolutely fo many 
 burning Balls, and which was no doubt, many Years ago, the Opinion 
 of Manillas, as is evident from thefe Lines in his Poem of the Sphere. 
 
 For how can we the rifing Stars conceive 
 A cafual Production •, or believe 
 Of the chang’d Heav’ns the oft renafcent State 
 Sol’s t frequent Births, and his quotidian Fate. 
 
 Sherburne. 
 
 And again in the fame Poem : 
 
 The fiery Stars, and ASther that creates 
 Infinite Orbs, and others diflipates. 
 
 Zoroajler, 
 
 * Ptolomy fuppofed two Heavens above that o f the fixed Stars, which he called the eighth j 
 viz. a ninth, the Cryftalline, and a tenth the Primum Mobile. See Letter the fecond. 
 
 The facred Sun, above the Waters rais’d. 
 
 Thro’ Heav’ns eternal, brazen Portals blaz’d ; 
 
 And wide o’er Earth diffus’d his chearing Ray, 
 
 To Gods and Men to give the golden Day. 
 
 Hom e r» 
 
 + Xenophanes believed the Stars to be no other than Clods fet on Fire, quenched in the Day- 
 time, and rekindled in the Night. 
 
3 o LETTER the FOURTH, 
 
 Zoroajler , the firfl: of all Philofophers we read of who ftudied the Stars, 
 is reported to have believed them of a fiery Nature. Empedocles judged 
 them to be Fire aethereal, ftruck forth in its Secretion, and blazing in the 
 upper Regions. Plato thought them Fire, with the Mixture of other Ele- 
 ments as Cements. Heraclides Worlds by themfelves, of Earth, Air, and 
 Fire ; and AriJlotle t fimple Bodies of the Subftance of Heaven, but more 
 condenfed. 
 
 But that I may not take up too much of your Time with Opinions 
 that has been imbibed in the Infancy of Aftronomy, and has long ago 
 been exploded, I fhall attempt but one Thing more to confirm your Sen- 
 timents in this new DoCtrine. 
 
 Firft, that the Stars are all at a Diftance, not to be determined by the 
 utmofl Perfection of human Art, is manifeft from their having very little, 
 or no fenfible Parallax ; and confequently, that any one ofthem is absolutely 
 bigger or lefs than another, from the fimple Laws of Opticks, cannot 
 poffibly come under our Obfervation to be afcertained ; but that they all of 
 them may be nearly of the fame Size or Solidity, is as impoflible, with any 
 Shew of Reafon to deny, fince it is a known Principle in Geometry, that all 
 vifible Objedts naturally diminith, as has been faid before, or are magnified 
 in a certain Proportion to their Diftance from the Eye ; and hence we may 
 conclude, and not without Reafon in its flrongeft Light to fupport us, 
 that the fmalleft Stars, to the very leaft Denomination, are only removed 
 reipeCtively more diftant from the Obferver’s Station; and that at leaft this 
 we may be certain of, that they are all together undoubtedly an Infinity 
 of like Bodies, diftributed either promifcuoufly, or in fome regular Or- 
 der throughout the mundane Space: And, as Marino fays, 
 
 Refplendent Sparks of the firft: Fire ! 
 
 In which the Beauty we admire. 
 
 And Light of thofe eternal Rays, 
 
 The uncreated Mind difplays. 
 
 It remains now I think to (hew, and endeavour to prove, that the Stars 
 are not only light Bodies of the Nature of the Sun, but that they are really 
 fo many Suns, all performing like Offices of Heat and Gravity, in a re- 
 gular Order, throughout the vifible Creation, in oppofition to an Opinion 
 
 you 
 
 ,* Mr. Bradley, Aftror.omer-Roval, has, in 2 great meafure, proved that the Aberration 
 of theStars hitherto miftaken for a Parallax, may arife from, and indeed feems to be no other 
 than the progreffive Motion of Light, and Change of Place to the Eye, ariftng from the 
 Earth’s annual Motion and Dire&ion. 
 
LETTER the FOURTH. 31 
 
 you have formerly hinted at, of their being in another Senfe of a fecon- 
 dary Nature. 
 
 All Objects within the fenfible Sphere of the Sun’s Attraction, or Ac- 
 tivity, are in fome meafure magnified by a good Telefcope : But the 
 Stars are all placed fo far without it, that the beft Glades has no other 
 Effect upon, them than making them appear more vivid or lively, but all 
 inate opaque Bodies, reflecting only a borrowed Light from fome primary 
 one, contrary to this Property, are all obferved to lofe their Light, in the 
 fame Proportion, as they are magnified, and through all Glades become 
 more dull than otherwife they appear to the naked Eye : And hence we 
 may infer, without any further Evidence, that the Stars are all light Bo- 
 dies endowed with native Luflre ; and that Bodies, like the known Pla- 
 nets, from the fame Reafoning, it is as clear they cannot be, becaufe their 
 Diftance, though uncertain as to the Truth of the whole, yet fuch a 
 Part of it as cannot be denied, would render them all in fuch a Cafe ifi- 
 vifible. 
 
 A Proof of this will plainly prefent itfelf, if we condder the Courfe of 
 the known Comets, who all of them, without Exception, become im- 
 perceptible, and intirely difappear j though mod; of them much bigger 
 than the Earth, or any of the lefler Planets, long before they arrive at 
 their refpedtive Aphelions. 
 
 But we are under a kind of Necedity to believe them either Suns or 
 Planets, that is either dark or light Bodies j and fince I have fhewn the 
 Improbability ; nay, I may venture to fay, the Impoflibility of their be- 
 ing the firft, it is natural fure to conclude, that they muff be of the laffc 
 Sort and I am perfuaded, if you but onceconfider how ridiculous it is to 
 imagine fo vaft a Number of Bodies, all rolling round a Number of invi- 
 flble Suns, which muff otherwife be the Cafe, fince they are feen on all 
 Sides of ours, and cannot poflibly be enlightened by him, or any, how all 
 of them, by any one elfe, you cannot poflibly have any fort of Difficulty 
 in this Determination : But that no Arguments may be wanting to enforce 
 your Belief of what is here concluded, it will not be amifs to put you in 
 Mind of an optical Experiment or two, which cannot fail of convincing 
 you of the vaft Probability of what is here aflerted of them ; and next to a 
 moral Certainty, demonffrate the Truth of what fomany of the beft Aftro- 
 nomers have advanced, as before namely, that the Stars are all, or molt 
 of them, Suns like ours. 
 
 Place any concave Lenfe before your Eye, and you will find all vifible 
 Objects will appear through it, as removed to a much greater Diftance 
 than they really are at, and reciprocally as much diminifhed. New, if 
 
 you 
 
32 LETTER the FOURTH. 
 
 you look upon one of thefe Glaffes of a proper Concavity, oppofed to 
 the Sun or Moon, you will refpedtively have the Appearance of a real Star 
 or Planet, the firft exhibited by the Body of the Sun, the other by the 
 Moon, and either more or lefs diminifhed in Proportion to the Surface of 
 the Sphere the Glafs is ground to. 
 
 For Example, a double Concave, or Glafs of a negative Focus, ground to 
 a Sphere of about three Inches Diameter, will if oppofed to the Sun’s Difk 
 at a proper Diftance from the Eye, help you to a very good Idea how the 
 Sun appears to the' Planet Jupiter ; and if a proper Regard be had to the 
 Diftance of the Planet Saturn , a Lenfe ftill more concave may be formed 
 to give a juft Idea of the Sun’s Appearance to Saturn. Again, one much 
 more concave than the former, proportioned to the Orbit of Mars , will 
 naturally exhibit the folar Body, as feen from that Planet. 
 
 To the Planet Venus and Mercury , the Sun appearing much larger than 
 to us at the Earth, to have any tolerable Notion of his varied Phenomena 
 to them, it will be neceffary to procure Glaffes of a fuitable Convexity, 
 ground to reciprocal Concaves, which may eafily be done to any Focus, 
 fo as to (hew how the Sun, naturally appears to the Inhabitants of thoie 
 two Planets. 
 
 The various Appearances of the Planets themfelves to us at the Earth, 
 may alfo well enough be had, if through Glaffes analagous to their re- 
 fpe£tive Diftance and Magnitude, we look at the Moon, particularly all 
 the Phafes of Venus , and even of Mercury , and the Gibofity of Mars , 
 &c. may be juftly and beautifully reprefented at different Ages of the 
 Moon, as thofe Planets appear through the largeft and beft Telefcopes. 
 
 This Way you may convince even your Friend * * *, who you tell me 
 has reafoned all his Senfes ufelefs, and yet continues fo great an Atheift in 
 Aftronomy, as not to believe the World turns round upon its Axis, though 
 he gives no better Reafon for it than that of his not being giddy. 
 
 After all thefe Arguments, I hope no new Difficulties will arife to re- 
 tard your Belief, or deprive the Stars of their folar Nature, fo juftly due 
 to them : This Point gained, the next Thing to be confidered is, whether 
 all thofe glorious Bodies, the far greater Part of whom being invifible to 
 the naked Eye, were made purely and purpofely for the foie Ufe of this 
 diminitive World, our little trifling Earth. 
 
 Men, conceited Lords of all, 
 
 Walk proudly o’er this pendent Ball, 
 
 Fond of their little Spot below, 
 
 Nor greater Beings care to know, 
 
 But think thofe Worlds , which deck the Skies , 
 
 Were only form'd to pleafe their Eyes. Duck, 
 
 The 
 
LETTER the FOURTH. 33 
 
 The very Suppofition not only implies a profound Ignorance of the Di- 
 vine Attributes, but is as impious, and full of Vanity, as it is erroneous 
 and abfurd, and even a Blind nefs fufficient of itfelf, were there no other 
 Caufe for it, to introduce Idolatry in the Minds of Mortals, by finking 
 the divine Nature fo near to the human. 
 
 It being granted that the Stars are all of the fame Kind, I think it may 
 be agreed, that what we evince of any one may be allowed to be true of 
 any other, and confequently of all the reft. This Pojlulata gained, I 
 fhall next proceed to enquire what the real Ufe and Defign of fo many ra- 
 diant Bodies are, or may be made for. 
 
 The Sun we have juftly reduced to the State of a Star, why then in Rea- 
 fon fiiould he have his attendant Planets round him, more than any of the 
 reft, his undoubted Equals ? No Shadow even of a Reafon can be given 
 for fuch an Abfurdity. 
 
 May we not with the greateft Confidence imagine, that Nature as juftly 
 abhors a Vacuum in Place, as much as Virtue does in Time ? Surely yes: 
 And by fuppoling the Infinity of Stars, all centers to as many Syftems of 
 innumerable Worlds, all alike unknown to us ; how naturally do we 
 open to ourfelves avaft Field of Probation, and an endlefs Scene of Hope 
 to ground our Expeftati on of an ever - future Happinefs upon, fuitable to 
 the native Dignity of the awful Mind, which made and comprehends 
 it and whofe Works are all as the Bufinefs of an Eternity ? 
 
 If the Stars were ordained merely for the Ufe of us, why fo much Ex- 
 travagance and Oftentation in their Number, Nature, and Make ? For a 
 much lefs Quantity, and fmaller Bodies, placed nearer to us, would every 
 Way anfwer the vain End we put them to ; and befides, in all Things 
 elfe, Nature is moft frugal, and takes the neareft Way, through all her 
 Works, to operate and effect the Will of God. It fcarce can be reckoned 
 more irrational, to fuppofe Animals with Eyes, deftined to live in eternal 
 Darknefs, or without Eyes to live in perpetual Day, than to imagine 
 Space illuminated, where there is nothing to be adled upon, or brought 
 to Light ; therefore we may juftly fuppofe, that fo many radiant Bodies 
 were not created barely to enlighten an infinite Void, but to make their 
 much more numerous Attendants vifible ; and inftead of difeovering a 
 vaft unbounded defolate Negation of Beings, difplay an infinite fhape- 
 lels Univerfe, crowded with Myriads of glorious Worlds, all varioufly 
 revolving round them j and which form an Atom, to an indefinite Creation, 
 with an inconceivable Variety of Beings and States, animate and fill the 
 endlefs Orb of Immenfity. 
 
 F 
 
 That 
 
34 LETTER the FOURTH. 
 
 That the fidereal Planets are not vifible to us, can be no Objection to 
 their actual Exiftence, and being there, is plain from this ; it is well 
 known, that the Stars theinfelves, which are their Centeral, and only ra- 
 diant Bodies, are little more to us at the Earth, than mathematical Points. 
 How ridiculous then is it to exped, that any of their fmall opaque At- 
 tendance, (hould ever be perceived fo far as the Earth by us ; and befides, to 
 fhow the Impoffibility of fuch a Difcovery, we need only confider, what is, 
 and what is not to be expeded, or known in our own home Syftem. All the 
 Planets in this our fenlible Region, every Aftronomer knows, is far 
 from being vilible to one another, in every individual Sphere ; for to an 
 Eye at the Orb of Saturn , this Earth we live upon, which requires Years 
 to circumfcribe, and Ages to be made acquainted with, and is far from 
 being yet all known, cannot pofiibly from the above Planet be feen : 
 And further, fince Saturn and Jupiter , two of the moft material and con- 
 fiderable Globes we know of, except the Sun himfelf, are Bodies appa- 
 rently of the fame kind, and are obferved to have each a Number of lefter 
 Planets moving round them; why may we not expect with equal Cer- 
 tainty and Propriety, that all other Bodies, under the fame Circumftances, 
 are in like manner attended ; that is, feeing the Sun is found to be the 
 Center of a Syftem of Bodies, all varioufly volving round him ? where lies 
 the Improbability of his fellow Luminaries, the Stars, being furrounded in. 
 like fort, with more or lefs of fuch Attendance. 
 
 I fhall offer but one Thing more to your Confideration in this Affair, 
 and which I am in great Hopes will be fufficient to make you think thefe 
 natural Suggeftions a good deal more than probable, and that is this : 
 
 The modern Aftronomers having, in a great meafure, proved that the 
 Stars are, in all refpeds, vaft Globes of Fire like our Sun. Let us fuppofe 
 a new-created Mind, or thinking Being, in a profound State of Ignorance, 
 with regard to the Nature of all external Objeds, but fully endowed with 
 every human Senfe and Force of Reafon, fufpended in iEcher, exactly in 
 the midway, betwixt * Syrius and the Sun ; in which Cafe, both of thele 
 Luminaries would equally appear much about the Brightnefs of the largeft 
 of our Planets. Now Ihould fuch a Being, determined either by Ac- 
 cident or Choice, arrive at this our Syftem of the Sun, and feeing all 
 the planetary Bodies moving round him, I would afk you what you think 
 he would imagine to be round Syrius ? Your Anfwer, I think I may ven- 
 ture to fay, would not be nothing ; and methinks I already bear you fay. 
 Why Planets fuch as ours. 
 
 * A Star of thefirft Magnitude in the greater Dog , and the moft neighbouring to our Sun. 
 
 PLATE 
 
LETTER the FOURTH. 
 
 35 
 
 PLATE XL 
 
 Is defigned as a geometrical Scale to all the primary Parts of the vifible 
 Creation, with regard to the Didance of Orbits compared with the Globe 
 of the Sun ; by which at once may be conceived, and judly meafured in 
 the Mind, not only the mean Didance of the Planets with regard to one 
 another, but alfo that of the Comets, and even the comparative Didances 
 of the neared of the Stars, which will, I guefs, greatly help you to form 
 an Idea of the vad Extent of Space neceffary to comprehend the whole 
 Creation. 
 
 Fig. i. Is a Radius of the Orbit of Mercury, in true Proportion to the 
 Body of the Sun reprefented at S, fhewing at the fame time a fmall Por- 
 tion of the opaque Planet’s Orbit, and the real Length of its Shadow at P. 
 
 Fig. 2. Is a Radius of the whole Sydem of the Planets as far as the 
 Orbit of Saturn in Proportion to a com pleat Orbit of Mercury , much lefs 
 than the former j the former lerving as a better known Scale to confider 
 the amazing Didances of the more remote Planets by. 
 
 Ladly, Fig. 3. Is a Reprefentation of the lead poffible Didance of 
 Syrius and the Sun, proportionable to the Magnitude of the Sphere of our 
 Comets, &c. reprefented at S, whereby it evidently appears, that as all the 
 Planets of Syrius mud be included within the fmall Sphere reprefented in 
 the Center P, none of them could poffibly be feen at the Sun, not only by 
 reafon of the Smallnefs of the Angle of Sudenfion, or Elongation, but al- 
 fo as being lod in the fuperior Light of Syrius himfelf, in fo minute an 
 Orb of Vicinity. 
 
 Confequently (as you mud perceive) no Arguments can poffibly be 
 drawn to deny the Exidence of fuch Bodies, with any Shew of Reafon, 
 from their not having been feen by us. 
 
 Here I mud obferve to you, that you cannot confider this Scale of Orbits 
 too much before you look upon Plate XVII. 
 
 To conclude, it evidently feems to be the End and Defign of Provi- 
 dence, by this vifible Variety of Beings, to lift the Minds of Men above 
 this narrow Earth, in Search of that powerful Being upon which we are 
 all fo much dependant ; and the Creator , no doubt, in this vad Difplay of 
 his Wildom and Power, defigned the amazing Whole, as the adequate 
 Objed of every Part, and as fuch equally open on all Sides, to the pene- 
 trating Progrefs of human Minds, and through the mod extenfive 
 Faculty of Senfe, the S'ght, to draw our Reafon and Underdanding by 
 Degrees, from finite Objeds into Infinity ; and as the lad Refult of ce- 
 ledial Contemplations place within our Reach, a certain Evidence of a 
 future State, and the tnanifefl Manfonsof Rewards and Funijhments, fuited 
 no doubt moji equitably to all Degrees of Virtue , and to every Vice. 
 
 F 2 
 
 When 
 
, ** 
 
 3-6 LETTER the FOURTH. 
 
 “ When I conlider (fays Mr .Addifon, fpeaking as having taken particular' 
 “ notice of a fine Evening) that infinite Hoft of Stars, or to fpeak more 
 “• philofophically of Suns, which were then fhining upon me, with thofe 
 ** innumerable Sets of Planets or Worlds, which were then moving round 
 their refpedlive Suns ; when I ftill enlarge the Idea, and fuppofed ano- 
 “ ther Heaven of Suns and Worlds rifing ftill above this which we dif- 
 “ covered j and thefe ftill enlightened by a fuperior Firmament of Lu- 
 “ minaries, which are planted at fo great a Difiance, that they may ap- 
 “ pear to the Inhabitants of the former as the Stars do to us ; in fhort, 
 “ whilft I purfued this Thought, I could not but refledt on that little 
 “ infignificant Figure which I myfelf bore amongft the Immenfity of 
 tf God’s Works This Reflection, I judge, as you are an Admirer of the 
 Author, you will not look upon as impertinent in this Place, efpecially as 
 it muft enforce what I have endeavoured to fhew you, namely, the Rea- 
 fonablenefs of a Plurality of fidereal Syftems, and their Multiplicity of 
 Worlds j which, if you are yet in Doubt of, I hope you will at lcaft for- 
 give fo well defigned an Attempt with your ufual Candour. 
 
 I am now prepared to proceed in the chief Defign of this Undertaking, 
 which is to folve the Phenomena of the Via Latfea j and propofe in my 
 next to anfwer more fully your farther Requeft. 
 
 I am , &c. 
 
 LETTER 
 
LETTER the FIFTH! 
 
 Of the Order, Diflance, and Multiplicity of the Stars, the Via Ladtea, and 
 
 Extent of the vifble Creation. 
 
 SIR, 
 
 W E are told, and, if I remember right, it is alfo your Opinion, 
 that three of the fineft Sights in Nature, are a riling Sun at Sea, 
 a verdant Landskip with a Rainbow, and a clear Star-light 
 Evening : All of which I have myfelf often obferved with vaft Delight 
 and Pleafure. The firft I have frequently beheld, and always with an 
 agreeable Surprize ; the fecond I have as often taken notice of, with no 
 fmall Degree of Admiration j but the laft I fhall never look up to with- 
 out an Aftonilhment, even mixed with a kind of Rapture. The Night 
 you laft left us, this admirable Scene was in its full Beauty ; and, as Milton . 
 fays, 
 
 Silence was pleas’d : now glow’d the Firmament 
 With living Saphirs ; Hefperus that led 
 The ftarry Hoft rode brighteft.- 
 
 I found it was impoflible to look long upon this ftupendious Scene, fo 
 full of amazing Objedts, and particularly the Via Ladtea, which (the 
 Moon being abfent) was then in great Perfection, without being put in 
 Mind of my Talk. Thisfurprizing Zone of Light being the chief Objedt 
 I have undertaken to treat of and demonftrate. 
 
 This amazing Phasnomenon which have been the Occafion of fo many 
 Fables, idle Romances, and ridiculous Opinions amongft the Antients, 
 ftill continues to be unaccounted for, and even in an Age vain enough to 
 boaft Aftronomy in its utmoft Perfection. 
 
 What will you fay, if I tell you, it is my Belief we are fo far from the 
 real Summit of the Science, that we fcarce yet know the Rudiments of what 
 may be expedted from it. This luminous Circle has often engrofled my 
 Thoughts, and of late has taken up all my idle Hours ; and I am now in 
 
 great 
 
38 LETTER the FIFTH. 
 
 great Hopes I have not only atlaft found out the real Caufe of it, but alfo 
 by the fame Hypothefis, which folves this Appearance, fhall be able to de- 
 monflrate a much more rational Theory of the Creation than hitherto has 
 been any where advanced, and at the fame Time give you an intire new 
 Idea of the Univerfe, or infinite Syftem of Things. This mod furprizing 
 Zone of Light, which have employed fucceffively for many Ages paft, 
 the wifeft Heads amongft the Antients, to no other Purpofe than barely 
 to defcribe it ; we find to be a perfect Circle, and nearly bifedting the ce- 
 jeftial Sphere, but very irregular in Breadth and Brightnefs, and in many 
 Places divided into double Streams. 
 
 * The principal Part of it runs through the Eagle , the Swan, Caffiopea, 
 Perjeus , and Auriga , and continues its Courfe by the Head of Monoceros , 
 along by the greater Dog through the Ship, and underneath the Centaur's 
 Feet , till having pafied the Alter, the Scorpion s Fail, and the Bow of 
 Aquarius, it ends at laft where it begun. 
 
 PLATE XII, and XIII. 
 
 Reprefents the two Hemifpheres, where its true Tradt is diftinguifhed 
 ftmongft the principal Stars, and may eafily be conceived by them to cir- 
 cumfcribe and bifedt the whole Heavens. 
 
 This is that Phenomena 1 am about to explain and account for; but 
 before I proceed farther, I judge it will be no improper Precognit a, to give 
 you the Thoughts of the Antients upon it ; the Relation perhaps may re- 
 quire fome Patience ; but I guefs, that after reading fuch wild and extra- 
 vagant Notions concerning it, you will naturally judge more favourably of 
 the Conjectures of the Moderns upon it, and particularly of what is con- 
 cluded in trie fucceeding Pages. 
 
 Fheophrajlus 
 
 * Carried toward the oppofed Bears , 
 
 Its Courfe ciofe by the Artick Circle fleers. 
 
 And by inverted Caffiopea tends ; 
 
 Thence by the Swan obliquely it defcends 
 The Summer Tropick, and Jove's Bird divides.; 
 
 Then crofs the Equator, and the Zodiack glides 
 ’Twixt Scorpio's, burning Tail, arm the left Part 
 Of Sagitarius , near the fiery Dart ; 
 
 Then by the other Centaur’s Legs and Feet, 
 
 Winding remounts the Skies (again to meet) . 
 
 By Argos' Topfail, and Heav’ns middle Sphere, 
 
 Palling the Twins, t’ o’ertake the Charioteer; 
 
 Thence CaJJiopea feekingthee does run, 
 
 O’re Perfeus Head, and Ends where it begun. 
 
 Sher, Manilius. 
 
LETTER the FIFTH. 
 
 39 
 
 Pheophraflus * was of Opinion, that the Hemifpheres, which, by many 
 of the Antients were imagined to be folid, was joined together here; and 
 that this was the foldering of the two Parts into one. ■f* Diodorus 
 thought it celeftial Fire, of a denfe and compad Nature, feen through the 
 Clifts or Cracks of the parting Hemifphere : But as Manilius fays, 
 
 Aflonifhment mud fure their Senfes reach, 
 
 To fee the World’s wide Wound, and Heav’n’s eternal Breach. 
 
 Oenopides || believed it the ancient Way of the Sun, till frighted at the 
 bloody Banquet of Thyejiis. ** Eratosthenes fuppofed it Juno's 
 Milk, fpilt whilffc giving Suck to Hercules. Plutarch makes it the 
 Effed of Phaeton ' sconfufed Erratication ; but I think it is plain 'f'f Ovid 
 judged them to be Stars, and the ancient Ethnicks believed them to be 
 the blifsful Seats of valiant and heroic Souls. 
 
 -Valiant Souls, freed from corporeal Gives, 
 
 Thither repair, and lead aethereal Lives. 
 
 Manilius. 
 
 * Macrobius, lib. i. cap. 15. 
 
 Or meets Heaven here ! and this while Cloud appears 
 The Cement of the clofe-wedg’d Hemifpheres ! 
 
 f The facred Caufes human Breads enquire, 
 
 Whether the heavenly Segments there retire, 
 fThe whole Mafs fhrinking, and the parting Fame 
 Thro’ cleaving Chinks admits the dranger Flame. 
 
 II Orfeems that old Opinion of more Sway, 
 
 That the Sun’s Horfeshere once run adray, 
 
 And a new Path mark’d in their draggling Flight, 
 Of fcorching Skies, and Stars aduded Light. 
 
 ** Nor mud that gentle Rumour be fuppred. 
 
 How Milk once flowing from fair “Juno's Bread 
 Stain’d the celedial Pavement, from whence came 
 This milky Path, its Caufefliewn in its Name. 
 
 When from the hurried Chariot Light’ning fled. 
 
 And fcatter’d blazes all the Skies o’erfpread ; 
 
 Bv whofe Approach new Stars enkindled were, 
 Which dill as Marks of that fad Chance appear. 
 
 ft A Way there is in Heaven’s expanded Plain 
 Which when the Skies are clear, is feen below, 
 
 And Mortals by the Name of Milky , know, 
 
 The Ground- work is of Stars 
 
 Manilius. 
 
 Ovid's Met, lib. i. 
 
 But 
 
40 
 
 LETTER the FIFTH. 
 
 But * Democritus long ago believed them to bean infinite Number of 
 fmall. Stars ; and fuch of late Years they have been difcovered to be, firfl: by 
 Gnllaleo , next by Keplar , and now confirmed by all modern Aftronomers, 
 who have ever had an Opportunity of feeing them through a good Te- 
 lefcope. 
 
 PLATE XIV. 
 
 Is from an Obfervation I made myfelf, of a bright Part of this Zone near 
 the Feet of Antinous j which, (by a Miftake of the Engraver) is, as it ap- 
 pears through a Tube of two convex Glafles. I faw it through a very 
 good Reflector, and formed the Plan by a Combination of Triangles. 
 
 Milton takes notice of this Zone in a mod beautiful Manner, where he 
 defcribesthe Creator’s Return from his fix Day’s Work to Heaven, he in- 
 troduces it as a Simile to exprefs his Idea of the eternal Way, or Road to 
 the celeflial Manfions. 
 
 A broad and ample Road, whofe Dufl is Gold 
 
 And Pavement Stars, as Stars to thee appear, 
 
 Seen in the Galaxie , that Milky Way, 
 
 Which nightly as a circling Zone thou feeft 
 Powder’d with Stars. 
 
 'But to infer from their Appearance only, that they are really Stars, with- 
 out confidering their Nature and Diftance ; and that nothing but Stars 
 could pofiibly produce fuch an EfteCt, may perhaps be afliiming too 
 much, when we have nothing but the bare Credit of the Belgic Glafies to 
 fupport our Conjectures ; and although this may be fufficient for any Ma- 
 thematician, yet for your greater Satisfaction, I have thought proper to 
 give two or three more evincing Arguments, to confirm thefe important 
 Difcoveries. Democritus , as I have faid before, believed them to be Stars 
 long before Aftronomy reaped any Benefit from the improved Sciences of 
 Optics ; and faw, as we may fay, through the Eye of Reafon, full as far 
 into Infinity as the mod able Aftronomers in more advantageous Times 
 have done fince, even affified with their belt Glaffes : And his Conjec- 
 tures are alrnoft as old as the philolaic Syflem of the Planets itfelf j the 
 ConftruCtion of which, though attempted by many, none have ever yet 
 been able to confute. 
 
 The Light which naturally flows from this Crowd of radiant Bodies is 
 mixt and confided, chiefly occalioned by the Agitation of our Atmo- 
 fphere, and from a Union of their Rays of Light, by a too near Proxi- 
 mity of their Beams, altogether they appear like a River of Milk, but 
 more of a pelucid Nature, running all round the flarry Regions. 
 
 * Plutarch ( in Placitis Phitofoph.) 
 
 For 
 
LETTER the FIFTH. 
 
 4i 
 
 For in the azure Skies its candid Way 
 Shines like the dawning Morn, or doling Day. 
 
 There are alfo many more fuch luminous Spaces to be found in the 
 Heavens of the fame Nature with thefe, which we know to be Stars ; in 
 particular the Nebula , or cloudy Star in the Prafepe of 36 j a cloudy Star 
 in Orion of 2 1 j * a cloudy -f- Knot not far from this in the fame Aflerifm 
 of 80 ; in one Degree of the fame Conftellation 500, and in the whole 
 Form above :j: 2000. All of which are great Confirmations of the Truth 
 of our Aflertion, i. e. that this Zone of Light proceeds from an infinite 
 Number of fmall Stars. Here it will not be amifs to obferve, that it has 
 been conjedtured, and is ftrongly fufpedted, that a proper Number of Rays, 
 meeting from different Directions, become Flame ; and that hence it may 
 prove not the Sun’s real Body which we daily fee, but only his inflamed At- 
 mofphere. I begin to be of Opinion, and I think not without Reafon, 
 that the true Magnitude of the Sun is not near what the modern Aftro- 
 nomers have made it j and that it may not pofilbly be much above two 
 Thirds of what it appears to us; I don’t mean that this Expanfion of the 
 folar Flame is any Part of that dilated Light mentioned by Sir Ifaoc New- 
 ton y and conceived to be round all light Bodies in general j but you may 
 confider it as not much differing from it, not of an unlike Nature, only 
 greater in Degree, and peculiar to the Sun and Stars, who are all, as has 
 been before in a manner demonftrated to be actually Globes of Fire. 
 
 This, tho’ I prefume to call itatprefent only meer Hypothefis, will in a 
 great meafure account for the exceffive Changes in the Conftitution of our 
 Air and Atmof^here, which we often find very unnatural to the Seafon j 
 alfo be a Means perhaps of reconciling the vafl: Difproportion fo very re- 
 markable betwixt the Sun and the lefl'er Planets, and many other Circum- 
 ftances in the Syflem of no fmall Confequence in Aftronomy : One of 
 which Particulars you have frequently expreffed a great Miflrufl and 
 Difapprobation of, as fufpedtng fome kind of a Fallacy in the Computa- 
 tion ; and the other is Matter of general Complaint, being by many attri- 
 buted to a Change in the Diredtion of the Earth’s Axis II ; and by fome, 
 efpecially the Vulgar, to too near an Approximation of the Earth to fome 
 one of the celeflial Bodies. But all this will very naturally be accounted 
 for by the Levity, or expanding Quality of the Sun’s circumambient 
 
 * Vide Galileo. 
 
 f Betwixt the Sword and Girdle of Orion . 
 
 J Vide Reitba. 
 
 || Which, through Ignorance of the true Cafe, is commonly called a Shock, a Brufh, or 
 Vbove. 
 
 G Flame, 
 
42 LETTER THE FIFTH. 
 
 Flame, or Atmofphere; and hence, according to its various State, being 
 more condenfed, or rare, we may have Heat or Cold in the greated Ex- 
 tream, and alternately fo, in a perpetual Viciditude. 
 
 The Truth of this Dodtrine will evidently appear from the Obfervations 
 of the Sun’s Diameter through the Year 1660, by the indefatigable Mou- 
 ton: And, I mud; own, I am not a little furprized to find that no Conclufions 
 have been drawn from them of this Kind. I am perfwaded, if you once 
 compare thole Numbers, you will be very far from thinking this an 
 improbable Suggedion. But this Digreffion has led me a little too far 
 from the Via La 5 iea i and too near home again ; I mud now think of re- 
 turning to the Stars, and my next Endeavours mull: be to give you fome 
 Idea of the Number of them. Through very good Telefcopes there 
 have been difcovered in many Parts of this enlightened Space, and even 
 out of it, feveral thoufand Stars in the Compafs of one fquare Degree j in 
 particular near the Sword of Perfcus , and in the Conflellations of * Taurus 
 and Orion . 
 
 PLATE XV. 
 
 Reprefents the Pleides , a well known Knot of Stars in the Sign Tau- 
 rus , as they appeared to me thro’ a one Foot reflecting Telefcope : And 
 Plate XVI. is a View of the Perfides, another iurprizing Knot of Stars 
 in the Condellation Perfeus, exactly as they appear through a Tube of 
 two convex Glades. There are alfo other luminous Spaces in the ftarry 
 Regions, not unlike the Milky Way, which I have had no Opportunity 
 of obferving ; fuch as the Nebecidce , near the South Pole, called by the 
 Seamen Magellanic Clouds j and which likewife viewed through Tele- 
 fcopes, prefent us with little Nebidce , and fmall Stars interperfed : One of 
 thefe Kind is fituated between Hydros and Dorado j and another, l'ome- 
 thing lcls than this, betwixt Hydrus and the Toucan. 
 
 Now admitting the Breadth of the Via Lablea to be at a Mean but 
 nine Degrees, and fuppofmg only twelve hundred Stars in every fquare 
 Degree, there will be nearly in the whole orbicular Area 3,888,000 Stars,, 
 and all thefe in a very minute Portion of the great Expanfe of Heaven. What! 
 a vad Idea of endlefs Beings mud: this produce and generate in our Minds ; 
 and when we confider them all as flaming Suns, Progenitors, and Primum 
 Mobiles of a dill much greater Number of peopled Worlds, what lelkthan 
 an Infinity can circumfcribe them, lefs than an Eternity comprehend.ffiem, 
 
 * Galiliso in one cloudy Star of this Conftellation, difcovered no lelj 
 and in that of the Pr&fepe thirty-fix. 
 
 nan twenty-one. 
 
 or 
 
LETTER the FIFTH. 43 
 
 or lefs than Omnipotence produce and fupport them, and where can our 
 Wonder ceafe ? 
 
 In this Place perhaps I ought not to pafs over the aftonifhing Pheno- 
 menon of feveral new Stars, &c. which have frequently appeared, and 
 foon again vanilhed, in the fame Point of the Heavens. But as the Bu- 
 finefs of this Theory is rather to folve the general, than any pariicula 
 Phenomenon, I thall only here by way of Note fubjoin a Table of fuch 
 as has been regularly obferved, and by whom they were firft difcovered. 
 
 A Table of feveral new Stars, Nebulae, and double Stars, hi c. 
 
 Nomina Stellarum. 
 
 Obfervationum. 
 
 S Loft after the burning of Troy, but now returned ; 
 C Ricciolns. 
 
 Septima Pleiadum 
 
 A new Star appeared in CaJJiopea, nearly 9 
 
 in the fame Place with that of . 572. $ D °™- 94 5 -> br g ht as Jupiter ; fee Ricaolus 
 
 The new Star in CaJJiopea' s Chair. 
 
 fee 
 
 A new Star in Cello Ceti. 
 
 A new Star in the Swan’s Neck, 
 
 A new Star in the Right Foot of Serpen- 
 tar ius, 
 
 A new Star in Andromeda's Girdle, 
 
 A new Star in Antinous, 
 
 A new Star feen in the Whale, 
 
 A new Star in the Fox’s Head, 
 
 A new Star in the Swan’s Neck. 
 
 Bright as Venus, from November 1572 to March 1574. 
 f Of the 3d Magnitude, is faid to have appear’d periodically, 
 J feven Times in fix Years, i. e. every three hundred and 
 ) thirteen Days: It was firil oblerved in Augujl 1596, for 
 v two Months, by D. Fabricius 
 
 ^-Obferved by Kepler in 1600, of the third Magnitude, till 
 \ the Year 1659; then gradually decreafing ; in 1661 it 
 \ difappeared ; in 1 666 it became vifible again, and is 
 yet to be feen of the fixth Magnitude. 
 
 C Bright as Venus from Oftober 1604 to Oflober 160; ; fee 
 c. Kepler. 
 
 Seen by Simon Marius and Fabricius, Anno 1612. 
 
 Seen by Jufus Byrgius. 
 
 In 1638, by John Procyclides Holuarda, of the third Mag- 
 nitude, which difappeared periodically, every three 
 hundred and thirty Days. 
 
 \ Of the third Magnitude, feen by Hevelius in July 1670, 
 "v and till Augujl 1671, alfo from March 1672 to Septem- 
 c her 1672 
 
 This appear’d periodically every four hundred and four 
 Days, and about fix Months at a Time ; it was feen at 
 its brighteft, September 10, 1714. 
 
 Of the Nebulae, or Cloudy Stars. 
 
 Nebulofc in Orion's Sword. 
 
 Ncbulofe in Andromeda's Girdle 
 
 Nelulofe in the Bow of Sagitarius, Small, but very luminous. 
 
 Nebu/oje in Centaurus , Never feen in England. 
 
 A Nebulofe preceding the right Foot of fObfcure, but with a Star in the Middle of it. 
 
 Antinous, 
 
 Nebula? in Dorfo Herculis, 
 
 
 Difcovered by Dr. Hally 
 
 Befides the Nebula, and new Stars, it appears from the ancient Catalogues of Hevelius, &c. that 
 fome of the old ones have intirely vanilhed; in particular, one in the left Thigh of Aquarius, the 
 contiguous one preceding in the Tail of Capricorn ; the fecond on the Belly of the Whale ; the firlt 
 of the unformed ones after the Scales of Libra, and feveral others. Many of the Stars alfo appear 
 to be double, as the firft Star of Aries and Cafor; others triple, as one in the Pleiades; and the 
 middle one in Orion's Sabre ; and others again, quadruple, &c. 
 
 G 2 I would 
 
44 LETTER the FIFTH, 
 
 I would now willingly help you to conceive the indefinite mutual Di~ 
 ftance of the Stars, in order to give you fome fmall Notion of the Im- 
 menfity of Space j but as this will be a Talk merely conjectural, I fhall 
 only defire you to believe it as far as your Reafon will carry you, fafely 
 fupported by an obvious Probability. 
 
 Perhaps it may be neceflary here to acquaint you, that all the Stars are 
 fo far apparently of different Magnitudes, that no two of them are to be 
 found in the whole Heavens exactly the fame, either in Bignefs or Bright- 
 nefs *. The largeft we have fufficient Reafon to believe is the neareft to us ; 
 the next in Bignefs and Brightnefs more remote ; and fo on to the lead; we 
 fee, which we judge to be the moft remote of all. 
 
 The firft Degree, or that of the largeft Magnitude, we give to Syrius, 
 the fecond to Arcturus, the third to Aedebaran, the fourth to Lyra, 
 the fifth to Capella, the fixth to Regulus, the feventh to Rigel, the 
 eighth to Fomahaunt, and the ninth to Antarus: Thefe are all faid 
 to be of the firft Clafs ; and befides which, there are at leaft, within the 
 Reach of our lateft improved Opticks, nine more Denominations within 
 the Radius of the vifible Creation. 
 
 Now, by the certain Return of the Comets, which we find are all go- 
 verned by the Laws of this Syftem, and fuppofed to be undifturbed by 
 any of the others, we cannot avoid concluding, if we confider them at 
 all to the Purpofe, that the neareft Stars cannot be lefs diftant than twice 
 the Radius of the greateft Orbit belonging to the Sun. Moft Mathema- 
 ticians think this a great deal too near, as it muft of courfe make all the 
 Syftems join, as in Contadf ; and I think we may fafely add, to feparate 
 their Spheres of Attraction, at leaft one Half of this Diftance more, which 
 will make in the Whole about four hundred and twenty Semi-orbits of the 
 Earth, or 33,600,000,000 Miles. This even the ingenious Mr. Haygins 
 endeavours to prove ftill much too little, and his Arguments are fuch as 
 cannot eafily be refuted. His Principle is grounded upon the known Laws 
 of Analogy, as confidered in the Proportion of light Surfaces, and is as 
 follows. Having reduced the Sun’s Ditk to the Appearance of the Star 
 Syrius, by tiie Help of a fmall Hole at the End of his Telefcope, and 
 comparing this Part of his Surface to the whole Difk of the Sun, he in- 
 fers that the Stars Diftance to that of the Sun muft be as 275664101. Hence 
 Syrius from us will be nearly (avoiding Units) 2,213,120,000,000 Miles: 
 But this I take to be as much too large a& the former is too little; yet, as 
 
 * A very little Knowledge in Opticks will render this indifputable, and has been in a great 
 meafure demonllrated before; 1. in the Great Dog ; 2. in Bootes; 3. in the Bull; 4. in the Harp 
 of jlpdlo ; 5. in rfuriga ; 6. in the Lion ; 7. in Orion ; 8. in. the Southern Filh ; 9. at the 
 £r\d of Erridanus, 
 
 Mr.. 
 
LETTER the FIFTH. 45 
 
 Mr. Bradley has, with Tome Shew of Reafon, banilhed all the Stars out 
 of the Sphere of Parallax, the laft is the only Method we can poffibly 
 make ufe of with any kind of Confidence; and Sir Jfaac Newton endea- 
 vours to recommend it with great Force of Argument, as the only pro- 
 bable Means by which we can give any tolerable Guels at thefe immenfe 
 Meafurements of Space. 
 
 To moderate the Matter then if you pleafe, allow me but to make ufe of 
 a Mean betwixt the two fore-mentioned Numbers ; and we may take it for 
 granted, a Diftance fufficiently exaCt, to fuit all our Wants in the prefent 
 Cafe, namely, to give a very tolerable Idea of the Extent of the vifible 
 Creation, which is all I propofe in this Place to attempt; but I mean to 
 be much more exaCt in another. 
 
 Now as the Diftance from the Sun to the Earth is fo fmall in Proportion 
 to the Diftance of the Stars from us, and from one another, we may very 
 well confider the Sun as the Center of our Station, or Pofition in the general 
 Syftem or Frame of Nature. And as the Stars are very vifible thro’ good 
 Telefcopes, to the ninth or tenth Magnitude, if we multiply the primary 
 Diftance of Syrius , or of any other of his Clafs, by this Number of com- 
 mon intermediate Spaces, the ProduCt will be equal to the Radius of the 
 vifible Creation to the folar Eye ; which, by this Rule, you will find in 
 capital Numbers to be * nearly 6,000,000,000,000 Miles, taking in a Star 
 of the fixth Magnitude, and to a Star of the ninth, 9,000,000,000,000 
 Miles : But this Computation fuppofes a mean common Diftance of the 
 Stars in a fort of Syzygia, or Direction of a Right Line, which is not the 
 real Cafe; for the Stars cannot be fuppofed to diminifh in a proportional 
 Magnitude by any mathematical Ratio , but by fome geometrical, or ra- 
 ther mufical one; forlnftance, if the Diftance of a firft be 3, that of a 
 fecond lhould be about 5, and of a proportional Third §,333, &c. 
 ad infinitum : But as their true proportional Diftance is unknown, the above 
 will be fufficient for our prefent Purpole ; which is only to fhew, without 
 Exaggeration, the Space we now are truly fenfible of. 
 
 This I have here confidered more extenfively, to obviate all Objections 
 that you may make to the Probability of the general Motion of the Stars, 
 by (hewing no Difficulty can poffibly arile from their apparent Proximity, 
 Number, or irregular Diftribution : Their Diftances being fo immenfely 
 large, no Diforder or Confufion can be fuppofed in any Direction of them, 
 or Motion whatever. The greateft Diftance of the Planets, which all 
 move undifturbed round the Sun, is about three hundred and fifty-three 
 Million of Miles: But the lead Diftance of one Star from another, is 
 
 * If the Diftance of the Sun and Earth is found too much, which I muft own I have a vio- 
 lent Sufpicion of, thefe Numbers muft be reduced in like Proportion. 
 
 upwards 
 
46 LETTERtheFIFTH. 
 
 upwards of two thoufand eight hundred and thirty-two Times that Di- 
 ftance, or one Million of Millions of Miles : And as no fenfible Dis- 
 order can be obferved amongft the folar Planets, what Reafon have we 
 to fuppofe any can be occafioned amongft the Stars, or that a general Mo- 
 tion of thefe primary Luminaries round a common Center, fhould be any 
 way irrational, or unnatural ? 
 
 What an amazing Scene does this difplay to us ! what inconceivable 
 Vaftnefs and Magnificence of Power does fuch a Frame unfold ! Suns 
 crowding upon Suns, to our weak Senfe, indefinitely diftant from each 
 other j and Miriads of Miriads of Manfions, like our own, peopling In- 
 finity, all fubjeCl to the fame Creator’s Will ; a Univerfe of Worlds, all 
 deck’d with Mountains, Lakes, and Seas, Herbs, Animals, and Rivers, 
 Rocks, Caves, and Trees; and all the Produce of indulgent Wifdom, to 
 chear Infinity with endleis Beings, to whom his Omnipotence may give a 
 variegated eternal Life. 
 
 The aftonifhing Diftance of the ftarry Manfions undoubtedly was defign’d 
 to anfwer fome wife End: One Confequence is this, and probably is not 
 without its Ufe : To every Planet of the fame Syftem, the fame fidereal 
 Face of Heaven appears without the leaft Degree of Change ; and as the 
 remoteft Regions upon Earth fee the fame Moon and Planets, fo alfo the 
 Inhabitants of the moft diftant Planets in ours, or in any other Syftem, fee 
 the fame Forms and Order of the Stars in common with the reft. The 
 whole Sphere of Heaven being common and unchangeable through all 
 their various Revolutions. 
 
 Thus thofe (the People) in the Planet Venus, will fee the Conftellation 
 of Orion juft as we do, and the People in the Planet Saturn , much farther 
 ftill removed, alike will view this Conftellation in all refpedts the fame ; 
 here then, (in the Syftem of the Sun) the Eye removed from us muft only 
 hope to find a new Earth furrounded with the fame fort of Sky : But Beings 
 in another Syftem, behold not only a new Heaven above, but alfo new 
 Earths below ; and all the Frame of Nature to them puts on a new Drefs, 
 new Signs, new Seafons, and new Planets roll, and a new Sun renews 
 the Day. 
 
 The Heathen Fables here are all erafed with all the Immortality of their 
 vain earthly Gods and Heroes ; Per feus and Alcidcs are no more, and both 
 the Bears are vanifhed ; the P Li ads and the Hyads join, and fliining Leo, 
 though bo . fling two Stars of the hrft Magnitude with us, there no where 
 can be found, loft in the common undillinguifhed Herd. But ftill Aftro- 
 nomy will exift, and new-framed Forms may fill the varied Scene. 
 
 Perhaps you may expedt that I fhould here give you my Conjectures of 
 what fort of Beings may be fuppofed to refide in the Ens Primum , or Sedes 
 
 Be at or urn 
 
LETTER the FIFTH. 47 
 
 Bcatorum of the known Univerfe, whether mortal, immortal, or Creatures 
 partakingin fome Degree of theProperties of both ; as fuch maybe conceiv’d 
 to change their Natures and States, without a total Diffolution of their Senfes 
 by Death : And farther, it may poffibly be judged unpardonable in me not 
 to point out every blefled Abode, fuited to the Virtues, and' all the various 
 States an immortal Soul may be tranflated to j but this is a Tafk above 
 the human Capacity, or is the pure Province of Religion alone j the 
 Bufinefs of a Revelation rather than Reafon to difcover. Befides, it is 
 enough for the prefent Purpofe, to prove, that Miriads of celeftial Man- 
 fions, are to be difcovered within our finite View, and by a kind of ocular 
 Revelation, which vifibly extends the human Profpedt, as it were, far be- 
 yond the Grave. It matters not whether a Race of Heroes fill thefe 
 Worlds, or a Tribe of happy Lovers people thofe j whether a Peafant in 
 the Realms of Orion fhall ever become a Prince in the Regions of Ardln- 
 rm y or a Patriarch in Procion , a Prophet in the Precepce. Not to mention 
 all the Stages human Nature may, or have been deftined to in any one 
 World, as believ’d by the ancient Philofophers, befides the final Coalition 
 of all Beings much more naturally to be expedted in the Sedes Beatorum. 
 
 I fay, whatever our Cafe may be with regard to thefe Queries and 
 Futurity, the Plan and Principles of this Theory will not be at all changed 
 by it, fince what it is chiefly founded upon may be clearly demonftrated, 
 fo clearly and inconteftably, that, with the Reverend Dr. Youngs we may 
 juflly conclude, 
 
 Devotion ! Daughter of Aftronomy ! 
 and affirm with him alfo, That, 
 
 An indevout Aftronomer is mad. 
 
 But I find what I at firfh propofed will prove too long for this Letter. 
 However, I will endeavour to reward your Patience in my next, and 
 continue, &c.. 
 
 LETTER 
 
LETTER the SIXTH. 
 
 Of General Motion amongfi the Stars , the Plurality of Syfems } 
 
 merability of Worlds. 
 
 and Innu 
 
 S I R , 
 
 S INCE my laft, you’ll find by this, fpeaking in the Stile of Ker- 
 cher , that I have been very far from home, round almoft the vifible 
 Creation. I have indeed applied myfelf very clofely to tranfcribe 
 my Thoughts to you upon the old Subjedt the Milky Way , which my 
 former Letter left imperfedted. To return then to the Theory of the 
 Stars, and that yet unreconciled Phenomenon j let us reafon a little up- 
 on the vifible Order of the Stars in general, and fee what Conclufions can 
 be drawn from what every Aftronomer knows of them, and cannot be 
 difputed. 
 
 Firft then, that the Stars are not infinitely difperfed and diftributed in 
 a promifcuous Manner throughout all the mundane Space, without Order 
 or Defign, is evident beyond a Doubt from this vaft colledtive Body of 
 Light, fince no fuch Phenomenon could poffibly be produced by Chance, 
 or exhibited without a defigned Difpofition of its conftituent Bodies. 
 
 If any regular Order of the Stars then can be demonftrated that will 
 naturally prove this Phenomenon to be no other than a certain Effedt 
 arifing from the Obferver’s Situation, I think you muft of courfe grant 
 fuch a Solution at leaf! rational, if not the Truth j and this is what I pro- 
 pofe by my new Theory. 
 
 To a Spedtator placed in an indefinite Space, all very remote Objedts 
 appear to be equally diftant from the Eye j and if we judge of the Via 
 LaElea from Phenomena only, we muft of courfe conclude it a vaft Ring 
 of Stars, fcattered promifcuoufly round the celeftial Regions in the Direc- 
 tion of a perfedt Circle. 
 
 But when we confider the explanick Pofition of many other Stars, all 
 of the fame Nature, and not lefs numerous, together forming the great 
 Sphere of Heaven, we generally find ourfelves quite at a Lofs how to re- 
 concilethe two apparent Clafies j and I know none who have ever been 
 fuccefsful enough to reduce them to any one general Order. 
 
 You’ll 
 
LETTER the SIXTH. 49 
 
 You’ll fay probably how fhall we make this chaofic Difpofition of the 
 primary Luminaries agree with the fecondary Laws, and the juft Har- 
 mony obferved in the third * Creation, &c. 
 
 The Work now you fee is undertaken, and chiefly at your own Re- 
 queft, therefore I have a Right to expert you’ll be very indulgent to the 
 Author, and pafs over all his Faults, and allow him free Argument in 
 Purfuit of thefe important Truths, which will in the End open perhaps a 
 much wider Field of Contemplation to us, than at firft could be fuppofed 
 to be intended by the Genejis of Mofis. 
 
 That Defcription of the Beginning of Nature is not without its Beauty 
 and Noblenefs, fuitable to the Dignity both of the Author and SubjeCL 
 But fhould we even in this knowing Age of the World pretend to ac- 
 count for the Original of Things, as Mofes to fupport his believed di- 
 vine Legation, was obliged in fome meafure to do, we fhould foon be 
 reduced to talk in the fame Stile, and perhaps with lefs Probability, than 
 then at leaft appeared in his elegant Account of the Origin of the Univerfe, 
 efpecially if we do but confider, that what he wrote, was only to the 
 Senfes of a People who had not yet learnt to make ufe of their Reafon 
 any other way, but from the Appearance of Things, and upon a SubjeCl: 
 too fublime for vulgar Capacities in any Age, and had only been attempt- 
 ed in the deepeft Learning of Egypt , which, he though well acquainted 
 with, the Generality of them were totally Strangers to. 
 
 In the firft Place it muft be granted, that the Stars being all of the 
 fame Nature, are either all immoveable, or all fixed, that is all governed 
 by one and the fame Principle. 
 
 Now to fuppole them all fixed, and difperfed in an endlefs Diforder 
 thro’ the infinite Expanfe, which has long been the Opinion of many very 
 able Aftronomers amongft the Antients, and even now received by too 
 many of the Moderns, implies an Inactivity in thofe vaft and principal 
 Bodies, fo much the Reverfe of what may be expeCted, and what we 
 daily obferve through all the reft of their Attendants, namely, their own 
 refpeCtive Satellites, that we cannot poflibly upon any rational Grounds, 
 advance one Angle Argument to fupport fo much as a Conjecture towards 
 it, without betraying the greateft Simplicity, and next to an Affirmation 
 reduce the whole Frame of Nature, and all corporeal Beings to a wild 
 unmeaning Chance, ariiing from an unnatural Difcord and Confufion. 
 
 For upon the Principles of Locality and Materiality, you having al- 
 lowed me the Ufe of my Senfes and Reafon, as abfolutely neceflary to- 
 wards conceiving any Idea of our prefent State, or of Futurity : Upon 
 
 The Moon, Satellites of Saturn and Jupiter , &c. 
 
 H 
 
 thefe 
 
5 o LETTER the SIXTH. 
 
 thefe Principles I fay, unlefs our Faculties are ufelefs, if there are no other 
 Bodies or Beings in the Univerfe than what we fee, and are now fenfible 
 of, we muft now at the Height of this our prefent State, be as near Per- 
 fection as we can reafonably expebt, and asfuch ourfelves the fupreme Be- 
 ings of all Beings. To what End then do we form Ideas of a lucceeding 
 Life, where a more exalted State cannot be hoped for. 
 
 How abfurd and impious this is I leave to your own Reafon and Re- 
 flection : This is the fatal Rock upon which all weak Pleads and narrow 
 Minds are loft and fplit upon, confequently ought to be the mofl carefully 
 avoided, not only as the Nurfe of Atheifm, but as the dreadful Father of 
 Defpair : “ For, fay they, thefe unhappy Wretches, to be always the 
 “ fame, is inconfiftent with a Change ; and to be lets than what we are, 
 M any where hereafter, is full as difficult to conceive as to be more.” 
 Thus, unlels we admit of fuperior Seats and much more glorious Habita- 
 tions than thefe we are fenfible of, we ftrike at the very Root of a fair 
 flourifhing Tree of Immortality, and muft become Authors of our own 
 Defpair. I have often wonder’d how thinking Men could pofiibly fall in- 
 to fo grofs an Error, as that of a Spirit’s Annihilation; and I fhould be glad 
 to afk one of thofe fruitlefs Students, whether, upon the Evidence of our 
 prefent Being, it is not much more rational, to hope for a future, than to 
 expeCt a Ne plus ultra upon no Evidence at all. The Affirmative is certainly 
 much more natural to be conceiv’d than the Negative. But if Chance were 
 the Cafe, and that Chance produced all thefe regular and wondrous Works, 
 kis to be wifhed at leaft, that Chance might do the fame again ; and if not 
 Chance, of courfe an eternal Direbtion : But Chance only can effebt 
 Diforder, Difcord, and Confulion ; ergo, the vifible Harmony and Beauty 
 of the Creation declare for a Direbtion ; and this muft of Confequence, 
 from its perfebt Nature, proceed from the Wifdom and Power of an eter- 
 nal Being, God of Infinity , the Author of all Ideas : And if this primitive 
 Power produced us his Creatures from nothing, nothing can be want- 
 ing to revive our Frames again ; and if from fomething, that fomething 
 muft remain to eftablifh us in a future Life. But to return, how abfurd it is 
 to fuppofe one Part of the Creation regular, and the other irregular, or a 
 vifible circulating Order of Things, to be mixed with Diforder, and cir- 
 cumfcribing Part of an endlefs Confufion, is obvious to the weakeft Un- 
 derftanding, and confequently we may reafonably expebt, that the Via 
 Ladica, which is a manifeft Circle amongft the Stars, confpicuous to 
 every Eye, will prove at laft the Whole to be together a vaft and glorious 
 regular Production of Beings, out of the wondrous Will or Fecundity of 
 the eternal and infinite one felf-fufficient Caufe ; and that all its Irregularities 
 are only fuch as naturally arife from our excentric View : To demonftrate 
 
 which 
 
LETTER the SIXTH. 
 
 5i 
 
 which abfolutely and inconteftibly, we (hall only want this one Pojlulata 
 to be granted, viz. That all the Stars are , or may he in Motion : This, if 
 one may be allowed to judge of the Whole by the Similitude and Govern- 
 ment of its Parts, I am perfwaded you will think a very reafonable Af- 
 fumption j but that you may imbibe a good Opinion of this Affumption, 
 and entirely come into this much better to be wifhed Hypothcfis,I would 
 have you confult thefe following Arguments. 
 
 Fird, it is allowed, as I have endeavoured to fhew, by all modern Phi- 
 lofophers, that the Sun and Stars are all of the fame or like Nature ; con- 
 fequently, that the Stars are all Suns, and that the Sun himfelf is a Star. 
 
 PLATE XVII. 
 
 Reprefents a kind of perfpe&ive View of the vifible Creation, wherein 
 A reprefents the Sydem of our Sun, B, that fuppofed round Syrius , and 
 C, the Region about Rigel. The red is a promifcuous Difpolition of all 
 the Variety of other Syflems within our finite Vifion, as they ar.e fuppofed 
 to be pofited behind one another, in the infinite Space, and round every 
 vifible Star. That round every Star then we may juftly conjecture a 
 fimilar Syftem of Bodies, governed by the fame Laws and Principles with 
 this our folar one, though to us at the Earth for very good Reafons invi- 
 fible *. Secondly, 
 
 The Sun is alfo obferved to have a Motion round his own Axis in about 
 twenty-five Days. Now, fince all the other f Planets which move in 
 Orbits round him, and are within our Obfervation, are found to have a 
 like Rotation round their Axis, may we not as reafonably imagine, that 
 that Power which was able to give the Sun a Motion round his Axis, 
 could and would at the fame time, with adequate Eafe, give him alfo an 
 orbitular one ? and why not, fince no progreflive Mutability can either 
 take from, or didurb the boundlefs Property of an Infinity j and befides, 
 feeing to imagine him at red, is to impofe fuch an unnatural Stagnation 
 upon the eternal Faculty, quite repugnant to that imparable Power 
 which we fuppofe dands in need of neither Sleep nor Red ? 
 
 ’Tis true, the Sun may be faid to be the Governor of all thofe Bodies 
 round him ; but how? no otherwife than he himfelf may be governed 
 by a fuperior Agent, or a dill more a&ive Force j and methinks it is not a 
 
 * Anaximines believed the Stars to be of a fiery Nature ; and that there were certain terre- 
 ifrial Bodies that are not feen by us, carried together round them. Stob. Eel. Phyf cap. 25. 
 Pythagoras affirmed, that every Star is a World, containing Earth, Air, and either. 
 
 f Saturn , Jupiter , Mars, Venus, the Earth, Moon, and Mercury. 
 
 H 2 
 
 little 
 
5 a LETTER the JIX.TK 
 
 little abfurd to fuppofe he is not, fince. we have difcovered by undoubted 
 Obfervations, that the fame gravitating Power is common to all ; and that 
 the Stars themfelves are fubjed to no other Diredion than that which 
 moves the whole Machine of Nature. 
 
 Thirdly, From many Obfervations of the polar Points, and the Obli- 
 quity of the Earth’s Equator to the Plane of herfolar Orbit compared to- 
 gether, the Sun is very juftly fufpeded to have changed his fidereal Situa- 
 tion ; and this mud either arife from a Change in the Pofition of the Earth’s 
 diurnal Axis, or from a Removal of the Sun himfelf, out of the primitive 
 Plane of the Or bis Magnus. I believe you are fo much of a Mathematician, 
 as to know that if either of thefe Fads be allowed, the Confequence I 
 want will follow. I fhall not therefore here enter into any farther Difpute 
 about it i but I think it will be necefiary to fubmit fome Obfervations to 
 your Confederation, that may convince (you that there is a Motion fome- 
 where to be thus difcovered, and whether in the Sun, or in the Stars, or 
 in both, I leave to your own Determination, but to afiift your Imagina- 
 tion, I refer you to 
 
 PLATE XVIII. 
 
 The Globe S is here fuppofed to reprefent the Sun, having changed its 
 Situation by a local Motion from A to C, and B reprefents the Globe of 
 the Earth in a permanent Pofition, with its principal Points and Circles, 
 refpeding the primitive Plane A, B, K. Now in Confequence of the 
 Angle of Variation, A, B, C, it evidently appears that a new ecliptic Plane, 
 will be produced, as C, B, and alfo a Variation in the greateft Declination 
 of the Sun, North and South from the Line of the Equator D, L. Hence, 
 as in this Figure, the Obliquity of the Poles P, N, and G, F, will natu- 
 rally decreafe, and is fhewn in Quantity by the Line of Aberration 
 
 H, 1 - 
 
 Here follows a Table of the Change obferved in the Obliquity of the.. 
 Ecliptic by Aflronomers of different Ages. 
 
 A Table of the Obliquity of the Ecliptic. 
 
 Ante Chrifli 
 
 124 Arato - 
 
 Hiparchus - 
 
 \ 2 j Eratosthenes 
 
 o / 
 
 24 
 
 00 
 
 
 2 3 
 
 5 1 
 
 1 
 
 T 
 
 2 3 
 
 5 1 
 
 1 
 
 % 
 
 Anno 
 
LETTER the SIXTH. 
 
 53 
 
 Anno Dorn. 
 
 
 0 
 
 / 
 
 
 140 
 
 Ptolomy - - - - - 
 
 - - - - 23 
 
 
 1 
 
 3 
 
 749 
 
 Abategnius - - - 
 
 23 
 
 35 
 
 z 
 
 2 
 
 1070 
 
 Airahel - - - - 
 
 - - - - 23 
 
 34 
 
 
 1 140 
 
 Alomean - - - - - 
 
 - - - - 23 
 
 33 
 
 
 1300 
 
 Profatiograd - - - 
 
 - - - - 23 
 
 32 
 
 
 1458 
 
 PURBACCHIO - - - - 
 
 - - - - 23 
 
 2 9 
 
 > 
 
 T 
 
 1490 
 
 Regiomontaus - - - - 
 
 - - - - 23 
 
 3 ° 
 
 
 1500 
 
 Copernicus - - 
 
 - - - - 23 
 
 28 
 
 r . 
 T 
 
 * 59 2 
 
 Tycho Brahe - 
 
 23 
 
 21 
 
 z • 
 
 T 
 
 1656 
 
 Cassini - 
 
 - - 23 
 
 29 
 
 i 
 
 7 " 
 
 Now fure, if we confider this continual Decreafe of the Sun’s Declina- 
 tion, which can proceed from no other Caufe than that of his having 
 moved out of the primitive Plane ; we need make no great Difficulty thus 
 far, to think our Conjectures not irrational. 
 
 The following is a Citation from Dr. Edmund Hally , Aftronomer-Royal. 
 See Philofophical Tranfattions, N°. 355. p. 736. 
 
 “ But while I was upon this Enquiry {of the Obliquity of the Ecliptic) 
 I, was furprized to find the Latitudes of three of the principal Stars in the 
 Heavens, direCtly to contradict the fuppofed greater Obliquity of the E- 
 cliptic, which feems confirmed by the Latitudes of mod of the reft j they 
 being fet down in the old Catalogues, as if the Plane of the Earth’s Orbit 
 had changed its Situation amongft the fixed Stars, about 2c' fince the 
 Time of Hipparchus , particularly all the Stars in Gemini are put down, 
 thofe to the Northward of the Ecliptic, with fo much lefs Lati- 
 tude than we find, and thofe to the Southward, with fo much more 
 foutherly Latitude ; and yet the three Stars Palilicium , Sirius , and 
 Arfturus, do contradict this Rule : For by it, Palilicium , being in 
 the Days of Hipparchus , in about 1 o gr. of Taurus, ought to be about 
 1 5' more foutherly than at prefent, and Sirius being then in about 15 gr^ 
 of Gemini , ought to be 20* more foutherly than now j yet Ptolomy places 
 the firft 20% and the other 22* more northerly in Latitude than we now 
 find them : Ncr are thefe the Errors of Transcribers, but are proved to 
 be right by the Declination of them fet down by Ptolomy, as obferved by 
 Timocharis , Hipparchus, and himfelf ; which (hew, that thefe Latitudes 
 are the fame as thofe Authors intended. As to Ardlurus, he is too near the 
 Equinoctial Colour, to argue from him concerning the Change of the Ob- 
 liquity of the Ecliptic j but Ptolomy gives him 33* more North Latitude 
 
 than 
 
54 LETTER the SIXTH. 
 
 than he is now found to have ; and that greater Latitude is likewife con- 
 firmed by the Declinations delivered by the abovefaid Obfervations : So 
 then thefe three Stars are found to be above half a Degree more foutherly 
 at this Time than the Antients reckoned them. When, on the contrary, 
 at the fame time, the bright Shoulder of Orion , has, in Ptolomy almoft a 
 Degree more foutherly Latitude than at prefent, what fiiall we fay then ? 
 It is l'carce to be believed, that the Antients could be deceived in fo plain 
 a Matter, three Obfervers confirming each other. Again, thefe Stars be- 
 ing the molt confpicuous in Heaven, are in all Probability the neared to 
 the Earth ; and if they have any particular Motion of their own, it is 
 mod likely to be perceived in them, which in fo long a Time as eighteen 
 hundred Years, may (hew itfelf by the Alteration of their Places, though 
 it be intirely imperceptible in the Space of one Angle Century of Years : 
 Yet, as to Syrius , it may be obferved, that Tycho Brahe makes him 2 Min. 
 more northerly than we now find him; whereas he ought to be above as 
 much more foutherly from his Ecliptic (whofe Obliquity he makes 2' 4 
 greater than we edeem it at at prefent) differing in the Whole 4' 4. 
 
 One Half of this Difference may perhaps be excufed, if Refradtion were 
 not allowed in this Cafe by Tycho ; yet 2 Min. in fuch a Star as Syrius , is 
 fomewhat too much for him to be midaken in. 
 
 But a more evident Proof of this Change is drawn from the Obfervation 
 of the Application of the Moon to Pallidum , An. Chrif. 509. Mar . 1 1. 
 when, in the Beginning of the Night, the Moon was feen to follow that 
 Star very near, and feemed to have eclipfed it, facihhs yup 6 vccparviv 
 
 2>tX,0T0fL’civ ^ipsi rvj{ Hv'pvvg nep ifeici; tov %£<puT /<7jX'V3V peepovg, l. e. Stella appojita 
 erat parti per quam bifecabatur limbus Luna illuminatus , as Bullialdus , to 
 whom we are beholden for this ancient Obfervation, has tranflated it. Now, 
 from the undoubted Principles of Adronomy, this could never be true at 
 Athens , or near it, unlefs the Latitude of Palilicium were much lefs than 
 we at this Time find it *. 
 
 The Motion of ArBurus feems further confirmed, from the Obferva- 
 tions of Tycho Hevelius and Flamjlead ; for Hevelius fets down the Didance 
 of that Star from Lyra 4' greater than Tycho had obferved it feventy- 
 t wo Years before him, and Flamjlead twenty-two Years after meafured 
 
 * Vide BuUald't AJlr. Philolaica , p. 172. 
 
 f Thefe are the neareft and greateft of the fixed Stars, the Motion of the others not having 
 been obferved, or being at too great a Difiance, are either imperceptible, or have not been 
 taken notice of. 
 
 i 
 
 > 
 
 / 
 
 the 
 
LETTER the SIXTH. 55 
 
 the Dihance betwixt the fame two Stars, hill 3 "'greater than Hevelius 
 found it ; fo that if Lyra had flood hill all that while, there was an Ap- 
 pearance of Ar Slums' % having gone 7' out of his Place in the Space of 
 an hundred Years. See Dr. Long's Ahronomy, p.274. 
 
 It is further to be obferved, in Confirmation of the Motion of one of 
 thefe Stars, that Flamjiead found the Dihance of Ar Slurus, from the Head 
 of Hercules 3' greater than it is fet down by the Prince of Hefle ; and that 
 his Dihance from the Lion’s Tail was a little decreafed with 5' 4 lefs Lati- 
 tude than Tycho had obferved. Hence, to make thefe Obfervations agree, 
 one or both of them muh have moved together equal to 7'. This Change 
 of Place, which is quite contrary to all known Caufes proceeding from the 
 Earth, muh therefore be occahoned either by the Motion of the Sun, or by 
 a particular Motion of their own ; but if, amongh themfelves, they muh all 
 move, and if all be in Motion, the Sun muh alfo move. 
 
 If thefe Obfervations, delivered down to us by very able Ahrono- 
 mers, be either true or near it, as great Allowances have been made for 
 the Ignorance of the Ages in which they were taken, and the Inaccuracy 
 of the Inhruments, we may naturally conclude, that thefe Stars muh have 
 a Motion ; and if they move, as has been before obferved, the Sun 
 muh alio ; hence he cannot now be in the original Plane of the 
 Earth’s annual Direction, or at leah in the fame identical Place he was at 
 firh poheffed of : And if fo, the Stars muh alfo have the like Motion, 
 though in different Directions, and all may thus be governed by the fame 
 kn pul live Power. 
 
 To illuhrate this primitive Motion of the Stars, and at the fame time to 
 fhow that the Variety which appears in the Quantity of Motion can be no 
 Objection to it, 
 
 See PLATE XVIII. Fig. 2. 
 
 Where A reprefents the Eye of an Oblerver, and B, E, F, H, various 
 Syhems, moving in different Directions thro’ the mundane Space; it is evi- 
 dent that the Sphere B, having moved from C, and that of E, not hav- 
 ing appeared to move at all, there muh be a fenfible Change in the new 
 Pofition of thefe two Syhems to one another, and fo of the reft; and tho’ 
 the apparent Motion of H, be much more than that of F, from the 
 Point A, yet from C, they will appear lefs different, and from B, they 
 will appear nearly equal. And farther, as the Direction from H, is in the 
 Line I, H, and that of F, in the Line K, G, thofe two Syhems will ap- 
 pear to approximate, and the Magnitude of the Star in the firh will be in- 
 
 creafed, 
 
5 6 LETTER the SIXTH. 
 
 ereafed, and in the latter diminished. Thus, many of the Stars in the 
 olded Catalogues, which were faid to be of the fecond Magnitude, are now 
 become of the firft, and feveralof the firfl are now judged to be of the fe- 
 cond, £?c. 
 
 But as this apparent Motion of the Stars at the Earth, muff, from its 
 Nature, be very fmall, fo as fcarce to be difcovered in fome of them in 
 lefs than an Age, with any Indrument by the niceft Obferver, I judge it 
 will be extremely proper in this Place topropofe fome Method, by which, 
 in procefs of Time, the Truth of the Theory may be afcertained. The 
 Way I think moft likely to fucceed is this. 
 
 PLATE XIX. 
 
 Is a Plan of the principal Stars that form the Pleiades, correCtly taken 
 by a Combination of Triangles, as in the Figure, from whence it will na- 
 turally follow, all the whole Form being comprehended in much lefs than 
 one Degree. That the mold minute local Motion in any one of thole Stars in 
 a very few Years, wiil be made fenfible to an Eye at the Earth. For 
 Indance, if any of the Stars that form the Letter A, or T, within the 
 Term of ten or twenty Years, be found in the lead: to deviate from the 
 Lines of their prefent Pofition and Direction, it will be evident beyond a 
 Contradiction, that they have a Motion amongft themfelves, and fince at 
 fuch a Diftance they cannot podibly be affeCted by the Earth, it mud be 
 a Motion of their own j and thus if any one can be proved, to change its 
 Situation, with regard to the red, we can have no new Difficulty in con- 
 cluding that they all may do the fame. 
 
 Thus if any of the regular Triangles M B Z, Z P H, A Z M, 
 TAT, or n O I, &c. in due Time be carefully noted, we may venture 
 to lay with great Safety, that the thoufandth Part of a Degree will be 
 plainly difcovered. 
 
 PLATE XX. 
 
 Is a true Plan and Combination of the principal Stars that form the Per- 
 sedes, in which other Oblervations may be made in a different Part of 
 the Heavens, and perhaps with an Opportunity of being dill more exaCf, 
 the Areas of thefe Triangles, particularly that of 0 I K, and thofe of 
 p and 5, being much lefs than the former, where the lead Alteration pof- 
 fible mud render them fenfibly didorted. But here it mud be confidered, 
 ihat the real Motion of the Stars, as well as their apparent, may be, and in 
 
 all 
 
LETTER the SIXTH. 57 
 
 all Likelihood, is extreamly flow, for the moft minute, vifible, local Mo- 
 tion, will anfwer all the Purpofes we know in Nature, and the greateft 
 feems to be that of the proje&ile, or centrifugal Force, which not only 
 preferves them in their Orbits, but prevents them from rufliing all toge- 
 ther, by the common univerfal Law of Gravity, which otherwife, as 
 a finite Diftribution of either regular or irregular Bodies, they mud at length 
 do by Neceflity. 
 
 I muft now inform you, that the above Obfervations were compleated 
 in the Autumn Season, 1747, and were taken by myfelf j the Letters 
 A, T, in Plate XIX, and the W in the XXth, as you may fee, having 
 a very near Refemblance, or Similitude, to the Order thefe Stars are found 
 to be in, together with the Greek Alphabet, I judged neceflary, by way 
 of Ajlerifm and Nomenclatura> in cafe fuch fhould be wanted, as Data in 
 future Difcoveries. 
 
 I come now to the principal Point in Queftion, which is to find a re- 
 gular Difpofition of the Stars amongft themfelves, which will naturally folvc 
 both their general and particular Phenomena, efpecially the Nebula 
 and Milky Way, 
 
 I am now , See, 
 
 I 
 
 LETTER 
 
( J* ) 
 
 LETTER the SEVENTH. 
 
 The Hypothefis, or Theory, fully explained and dcmonf rated, proving the 
 
 fidereal Creation to be finite .. 
 
 SIR , 
 
 I K N O W you are an Enemy to all Sorts of Schemes where they 
 are not abfolutely neceflary, and may poffibly be avoided j. and for 
 that Reafon I have purpofely omitted many geometrical Figures, and 
 other Reprefentations in this Work, which might have been inferted and 
 in fome Places, efpeeially here I might have introduced Diagrams, perhaps 
 more explicit than Words ; but as you have frequently obferved, they are 
 only of Ufe to the few Learned, and contribute more to the taking away 
 the little Ideas and Knowledge the more ignorant Many may be endued 
 with, by a prejudicial Impreffion of imperfedt Images, rather than the 
 adding any new Light to their Underftanding, I have purpofely avoided, 
 as much as poffible, both here and every where, all fuch complex Dia- 
 grams as might be in Danger of betraying any the lead: fuch confcious 
 Diffidence in you, ariling from the Want of a proper Frecognita in the 
 Sciences. 
 
 This Imperfection, much to- be lamented, as greatly to the Difadvan- 
 tage of all mathematical Reafoning, I would willingly always prevent, in my 
 Readers, and to chufe in my Friend ; I fhall therefore content myfelf with 
 referring you to a few orbicular Figures, concave and convex, as may bed: 
 fugged: to your Fancy the fimpled Way, a juft Idea of the Hypothefis I 
 have fram’d, and naturally enough I hope, render my Theory fo intelligible, 
 as to help you diffidently to conceive the Solution aimed at, of the impor- 
 tant Problem I have attempted. 
 
 As I have faid before, we cannot long obferve the beauteous Parts of 
 the vidble Creation, not only thofe of this World on which we live, but 
 alfo the Myriads of bright Bodies round us, with anv Attention, without 
 being convinced, that a Power fupreme, and of a Nature unknown to us, 
 prefides in, and governs it. 
 
 The 
 
LETTER the SEVENTH. 
 
 59 
 
 The Courfe and Frame of this vaft Bulk, difplay 
 A Reafon and fix’d Law, which all obey. 
 
 Sher. Manilius. 
 
 And notwithftanding the many wonderful Productions of Nature in this 
 our known Habitation, yet the Earth, when compared with other Bo- 
 dies of our own Syftem, feems far from being the moft confiderable in it j 
 and it appears not only very poflible, but highly probable, from what has 
 been faid, and from what we can farther demonftrate, that there is as 
 great a Multiplicity of Worlds, varioufly difperfed in different Parts of the 
 Univerfe, as there are variegated Objects in this we live upon. Now, as 
 we have no Reafon to fuppofe, that the Nature of our Sun is different 
 from that of the reft of the Stars ; and fince we can no way prove him fu- 
 perior even to the leaft of thofe furprifing Bodies, how can we, with 
 any Shew of Reafon, imagine him to be the general Center of the whole, 
 2. e. of the vifible Creation, and feated in the Center of the mundane 
 Space ? This, in my humble Opinion, is too weak even for Conjecture, 
 their apparent Diftribution, and * irregular Order argue fo much a- 
 gainft it. 
 
 The Earth indeed has long poffeffed the chief Seat of our Syftem, and 
 peaceably reigned there, as in the Center of the Univerfe for many Ages 
 paft ; but it was human Ignorance, and not divine Wifdom, that placed 
 it there j fome few indeed from the Beginning have difputed its Right to 
 it, as judging it no way worthy of fuch high Eminence. Time at length 
 has difcovered the Truth to everybody, and now it is juftly difplaced 
 by the united Confent of all its Inhabitants, and inftead of being thought 
 the moft majeftick of all Nature’s lower Works, now rather difgraces the 
 Creation, fo much it is reduced in its prefent State from what it had 
 Reafon to expeCt in the former. 
 
 Now it is no longer the only terreftrial Globe in the Univerfe, but is 
 proved to be one of the leaft Planets of the folar Syftem, and furprizingly 
 inferior to fome of its Fellow Worlds. The Sun, or rather the Syftem, 
 has almoft as long ufurped the Center of Infinity, with as little Pretence 
 to fuch Pre-heminence ; but now, Thanks to the Sciences, the Scene be- 
 gins to open to us on all Sides, and Truths fcarce to have been dreamt of, 
 before Perfons of Obfervation had proved them poflible, invades our Senfes 
 
 * See the Zodaical Conftellations, you’ll find that in fome Signs there are feveral Stars of 
 the firlt, fecond, and third Magnitude, and in many others none of thefe at all. 
 
 I 2 with 
 
6o LETTER the SEVENTH. 
 
 with a Subject too deep for the human Underftanding, and where our 
 very Reafon is loft in infinite Wonders. How ought this to, humble every 
 Mind fufceptible of Reafon ! 
 
 In this Place, I believe, you will pardon a Digreflion ; which, in An- 
 fwer to Part of your laft Letter, I judge will not be very impertinent, tho’ 
 perhaps juft here I cannot fo well juftify it. 
 
 Your late Converfation with our Friend Mr.* * *, I am perfwaded, 
 mull have been very entertaining ; but I cannot help thinking his Reflec- 
 tions upon the Wonders of Nature and the Wifdom of Providence, though 
 I muft allow them all to be very juft and curious, inftead of elevating 
 the Mind to the Pitch he would have it, rather as conlidered above, de- 
 prefs it below the proper, nay I might fay neceffary, Standard of human 
 Ideas. 
 
 This, probably, you’ll fay is an odd Turn, and may want fome Ex- 
 planation, fince every Objedt in the Chain of Nature, muft; of Force be 
 granted, a Subject worthy of our Speculations, being all together made, 
 as in the Maximum of Wifdom : But what I mean is this, fince nothing is 
 more natural for Beings in every State in fearch after their own Advan- 
 tages, and the Enlargement of their Ideas to look upward, fure it may be 
 prelumed, that Time may be mifpent, if not loft in infpedting too nar- 
 rowly Things fo little benefical inStates below us as Mr. Pope fays, 
 
 Why has not Man a microfcopic Eye ? 
 
 For this plain Reafon, Man is not a Fly. 
 
 Say what the Ule, were finer Opticks given. 
 
 To infpedt a Mite, not comprehend the Heav’n.. 
 
 Effay on Man .. 
 
 j 
 
 Amufement alone can never be fuppofed to be the foie End of human 
 Life, where even true Happinefs is a Thing we rather tafte than enjoy. The 
 Mind we find capable of much more rational Pleafure than can poflibly 
 fall within the Reach of human Power, either to promife or procure it j 
 but then this very Defedt in our prefent State of Exiftence affords us no 
 lefs than a moral Affurance, that fome where in a future, we may, if we 
 pleafe, be entitled, to the very Plenum of all Enjoyments.. 
 
 The peculiar Bufinefs then of the human Mind naturally precedes its 
 Amufements, as evidently ordained to foar above all the inferior Beings of 
 this World; and however our Natures may, thro’ Indolence, or thro’ 
 Ignorance, degenerate,, that of the Man can never be fuppofed to fink into, 
 the Mole. 
 
 The propereft Way then fure for Men to prefer ve their Pre-heminence 
 over the Brute Creation, is to make ufe of that Reafon and Reflection, 
 
 which 
 
LETTER the SEVENTH. 6 1 
 
 which To manifedly didinguifhes their natural Superiority. A right Appli- 
 cation of which, muft of courfe then diredt us to a forward, rather than 
 a backward Search in the vad vilible Chain of our Exigence, which clearly 
 connects all Beings and States as under the Direction of one fupreme Agent; 
 
 This is all I would have underflood by the foregoing Pofition, which, 
 in one Word, implies no more than that the fublime Philofophy ought 
 mail Reafon to be preferred to the Minute; but I hope you will not infer 
 from this my feeming Partiality for the celeftial Sciences, that I mean to 
 infinuate, that the Study of terreftrial Phyficks is not a rational Amufe- 
 ment. 
 
 Mr. ***, you fay, feems to lament the Tafle of Mankind in general much 
 in the fame Degree as you do his I readily grant you ; a Man who can talk 
 fo well upon an Ant, might make a more entertaining Difcourfe upon the 
 Eagle; but I beg his Pardon, and though we are all too ready, and mod 
 apt to condemn all fuch Pleafures as vain or trifling, which we have no 
 Share in, or Tafle for ourfelves •> yet I don’t think it follows, that thofe in- 
 genious Labours of his are ufelefs. The Pleafures arifing from natural 
 Philofophy are all undoubtedly great ones, whether we confider Nature in 
 her highefl, or in her lowed Capacity ; the Beauties of the Creation are 
 every. Day varied to us below, as much they are every Night above, and in 
 both Cafes, through every Objedt, the Creator fhines fo manifeft, that we 
 may juflly confider him every where fmiling full in the Face of all his 
 Creatures, commanding as it were an awful Reverence, and Refpedt, due 
 not only to his Omnipotency, but alfo to his infinite Goodnefs and endlefs 
 Indulgences. This is the only Return our Gratitude can make for all thofe 
 Blefiings he daily beffowsupon us, and to this great Author of her Laws, 
 Nature herfelf cries aloud through Myriads of various Objedts, and after 
 her own expreflive and peculiar Manner, feems to command us with an 
 attradtive Grace, to obferve her Sovereign, and admire his Wifdom. The 
 Majefty, Power, and Dominion of God is bed difplayed in the external 
 Diredtion of Things, his Wifdom and vifible Agency in the internal : 
 Hence, by proper Objedts, feiedted from both, attended with jud Re- 
 flections, we may certainly raife our Ideas almod to the Pitch of Immor- 
 tals ; but how far the human Imagination may poflibly go, or how much 
 Minds like ours may be improved, is a Quedion not eafily determined ; 
 but as natural Knowledge evidently increafes daily, and adronomical En- 
 quiries are the mod capable of opening our Minds, and enlarging our 
 Conception, of confequence they mud be mod worthy our Attention of 
 all other Studies.. But of this I have faid enough, and think it is now 
 more than Time to attempt the remaining Part of my Theory. 
 
 When 
 
6z LETTER the SEVENTH. 
 
 When we reflect upon the various Afpe&s, and perpetual Changes of 
 the Planets, both with regard to their * heliocentric and geocentric Mo- 
 tion, we may readily imagine, that nothing but a like eccentric Pofition of 
 the Stars could any way produce fuch an apparently promifcuous Differ- 
 ence in fuch otherwife regular Bodies. And that in like manner, as the 
 Planets would, if viewed from the Sun, there may be one Place in the Uni- 
 verfe to which their Order and primary Motions muff appear moft regular 
 and moft beautiful. Such a Point, I may prefume, is not unnatural to be 
 fuppofed, altho’ hitherto we have not been able to produce any abfolute 
 Proof of it. See Plate XXV. 
 
 This is the great Order of Nature, which I fhall now endeavour to 
 prove, and thereby folve the Phenomena of the Via Laftea j and in or- 
 der thereto, I want nothing to be granted but what may eafily be allow- 
 ed, namely, that the Milky Way is formed of an infinite Number of fmall 
 Stars. 
 
 Let us imagine a vaft infinite Gulph, or Medium, every Way ex- 
 tended like a Plane, and inclofed between two Surfaces, nearly even on 
 both Sides, but of fuch a Depth or Thicknefs as to occupy a Space equal 
 to the double Radius, or Diameter of the vifible Creation, that is to take 
 in one of the fmalleft Stars each Way, from the middle Station, perpen- 
 dicular to the Plane’s Direction, and, as near as poftible, according to our 
 Idea of their true Diftance. 
 
 But to bring this Image a little lower, and as near as poftible level to every 
 Capacity, I mean fuch as cannot conceive this kind of continued Zodiack, 
 let us fuppofe the whole Frame of Nature in the Forpi of an artificial Ho- 
 rizon of a Globe, I don’t mean to affirm that it really is fo in Fadt, but 
 only ftate the Queftion thus, to help your Imagination to conceive more 
 aptly what I would explain *. Plate XXIII. will then reprefent a juft 
 Section of it. Now in this Space let us imagine all the Stars fcattered 
 promifcuoufly, but at fuch an adjufted Diftance from one another, as to 
 fill up the whole Medium with a kind of regular Irregularity of Objedts. 
 And next let us confider what the Confequence would be to an Eye fituated 
 rear the Center Point, or any where about the middle Plane, as at the 
 Point A. Is it not, think you, very evident, that the Stars would there ap- 
 pear promifcuoufly difperfed on each Side, and more and more inclining to 
 Diforder, as the Obferver would advance his Station towards either 
 Surface, and nearer to B or C, but in the Diredtion of the general Plane 
 towards H or D, by the continual Approximation of the vifual Rays, 
 crowding together as at H, betwixt the Limits D and G, they muft in- 
 
 * Not to mention their feveral Conjunctions and Apuices to fixed Stars, &c. fee the State 
 of the Heavens in 1662, December the firft, when all the known Planets were in one Sign of 
 the Zodiac, viz. Sagittarius. 
 
 fallibly 
 
LETTER the SEVENTH. 6 $ 
 foflibly terminate in theutmod Confufion. If your Opticks fails you be- 
 fore you arrive at thefe external Regions, only imagine how infinitely 
 greater the Number of Stars would be in thofe remote Parts, arifing thus 
 from, their continual crowding behind one another, as all other Objedts 
 do towards the Horizon Point of their Perfpedlive, which ends but with 
 Infinity: Thus, all their Rays at lafl fo near uniting, mud meeting in the 
 Eye appear, as almod, in Contadl, and form a perfedt Zone of Light ; this 
 I take to be the real Cafe, and the true Nature of our Milky Way , and 
 all the Irregularity we obferve in it at the Earth, I judge to be lntireiv 
 owing to our Sun’s Pofition in this great Firmament, and may eafily be 
 folved by his Excentricity, and the Diverfity of Motion that may naturally 
 be conceived amongd the Stars themfelves, which may here and there, in 
 different Parts of the Heavens, occafion a cloudy Knot of Stars, as perhaps 
 at E. 
 
 But now to apply this Hypothefis to our prefent Purpofe, and reconcile* 
 it to our Ideas of a circular Creation, and the known Laws of orbicular 
 Motion, fo as to make the Beauty and Harmony of the Whole confident 
 with thevifible Order of its Parts r our Reafon mud now have recourfe to 
 the Analogy of Things. It being once agreed, that the Stars are in Motion, 
 which, as I have endeavoured in my lad Letter to (hew is not far from 
 an undeniable Truth, we mud next confider in what Manner they move. 
 Fird then, to fuppofe them to move in right Lines, you know is contrary 
 to all the Laws and Principles we at prefent know of j and fince there are 
 but two Ways that they can poflibly move in any natural Order, that is, 
 either in right Lines, or in Curves, this being one, it mud of courfe be 
 the other, i. e. in an Orbit j and confequently, were we able to view them 
 from their middle Pofition, as from the Eye feated in the Center of Plate 
 XXV. we might expedt to find them feparately moving in all manner of 
 Diredtions round a general Center, fuch as is there reprefented. It only now 
 remains to fhew how a Number of Stars, fo difpofed in a circular Manner 
 round any given Center, may folve the Phenomena before us. There are 
 but two Ways poffible to be propofed by which it can be done, and one 
 of which I think is highly probable j but which of the two will meet 
 your Approbation, I fhall not venture to determine, only here inclofed I 
 intend to fend you both. The fird is in the Manner I have above de- 
 feribed, i. e. all moving the fame Way, and not much deviating from the 
 fame Plane, as the Planets in their heliocentric Motion do round the 
 folar Body. In this Cafe the primary, fecondary, and tertiary condituent. 
 Orbits, &c. framing the Hypothefes, are reprefented inPtoXXI , and the 
 Confequence of fuch a Theory arifing from fuch an univerfal Law of Mo- 
 tion 
 
64 LETTER the SEVENTH. 
 
 tion in Plate XXII . where B, D denotes the local Motion of the Sun in 
 the true Orbis Magnus, and E, C that of the Earth in her proper fecondary 
 Orbit, which of courfeis fuppofed, as is fhewn in the Figure to change its 
 iidereal Pofitions, in the fame Manner as the Moon does round the Earth, 
 and confequently will occafion a kind of Proceflion, or annual Variation 
 in t he Place of the Sun, not unlike that of the Equinoxes, or Motion of all 
 the Stars together, from Weft to Eaft round the Ecliptic Poles, and pro- 
 bably may in fome Degree be the Occafion of it. This Angle is repre- 
 lented, but much magnified, by the Lines F, C, G, and the Unnatural- 
 nefs, or Abfurdity of a right Line Motion of the Sun by the Line I, H. 
 
 The fecond Method of folving this Phasnomena, is by a fpherical 
 Order of the Stars, all moving with different Diredtion round one com- 
 mon Center, as the Planets and Comets together do round the Sun, but 
 in a kind of Shell, or concave Orb. The former is eafily conceived, from 
 what has been already Paid, and the latter is as eafy to be underftood, if 
 you have any Idea of the Segment of a Globe, which the adjacent Figures, 
 will, I hope, affift you to. The Do&rine of thefe Motions will perhaps 
 be made very obvious to you, by infpedting the following Plates. 
 
 PLATE XXIV. 
 
 Is a Reprefentation of the Convexity, if I may call it fo, of the intire 
 Creation, as a univerfal Coalition of all the Stars confphered round one 
 general Center, and as all governed by one and the fame Law. 
 
 PLATE XXV. 
 
 Is a centeral Sedtion of the fame, with the Eye of Providence feated 
 jn the Center, as in the virtual Agent of Creation. 
 
 PLATE XXVI. 
 
 Reprefents a Creation of a double Conftrudtion, where a fuperior Or- 
 der of Bodies C, may be imagined to be circumfcribed by the former one 
 A, as polfeffing a more eminent Seat, and nearer the fupream Prefence, 
 and confequently of a more perfedt Nature. Laftly, 
 
 PLATE XXVII. 
 
 Reprefents fuch a Sedtion, and Segments of the fame, as I hope will 
 give you a perfect Idea of what I mean by fuch a Theory. 
 
 Fig. i. is a correfponding Sedtion of the Part at A, in Fig. 2. whofe 
 verfed Sine is equal to half the Thicknefs of the ftarry Vortice A C, or 
 B A. Now I fay, by fuppofing the Thicknefs of this Shell, 1. you may 
 imagine the middle Semi-Chord AD, or A E, to be nearly 6 j and con- 
 fequently. 
 
LETTER the SEVENTH. 65 
 
 thus in a like regular Diftribution of the Stars, there muff of courfe be at 
 leaf! three Times as many to be feen in this Direction of the Sine, or 
 Semi-chord A E, itfelf, than in that of the iemi-verfed Sine AC, or 
 where near the Direction of the Radius of the Space G. ^ E . D. 
 
 But we are not confined by this Theory to this Form only, there may 
 be various Syftems of Stars, as well as of Planets, and differing probably 
 as much in their Order and Diftribution as the Zones of Jupiter do from 
 the Rings of Saturn , it is not at all neceffary, that every collective Body 
 of Stars fhould move in the fame Direction, or after the fame Model of 
 Motion, but may as reafonably be fuppofed as much to vary, as we find 
 our Planets and Comets do. 
 
 Hence we may imagine fome Creations of Stars may move in the Di- 
 rection of perfect Spheres, all varioufly inclined, direCt and retrograde ; 
 others again, as the primary Planets do, in a general Zone or Zodiack, or 
 more properly in the Manner of Saturn's Rings, nay, perhaps Ring with- 
 in Ring, to a third or fourth Order, as (hewn in Plate XXVIII. nothing 
 being more evident, than that if all the Stars we fee moved in one vaft 
 Ring, like thofe of Saturn , round any central Body, or Point, the gene- 
 ral Phasnomena of our Stars would be folved by it; fee Plate XXIX. Fig. 1. 
 and 2. the one reprefenting a full Plane of thefe Motions, the other a Pro- 
 file of them, and avifible Creation at B and C, the central Body A, be- 
 ing fuppofed as incognitum, without the finite View 3 not only the Phe- 
 nomena of the Milky JVay may be thus accounted for, but alfo all the cloudy 
 Spots, and irregular Diftribution of them 3 and I cannot help being of 
 Opinion, that could we view Saturn thro’ a Telefcope capable of it, we 
 fhould find his Ringsnoother than an infinite Number of leffer Planets, infe- 
 rior to thofe we call his Satellites : What inclines me to believe it, is this, 
 this Ring, or Collection of fmall Bodies, appears to be fometimes very excen- 
 tric, that is, more diftant from Saturn' s Body on one Side than on the other, 
 and as vifibly leaving a larger Space between the Body and the Ring 3 which 
 would hardly be the Cafe, if the Ring, or Rings, were connected, or 
 folid, fince we have good Reafon to fuppofe, it would be equally attract- 
 ed on all Sides by the Body of Saturn , and by that means preferve every 
 where an equal Diftance from him ; but if they are really little Planets, 
 it is clearly demonftrable from our own in like Cafes, that there may be 
 frequently more of them on one Side, than on the other, and but very 
 rarely, if ever, an equal Diftribution of them all round the Saturnian 
 Globe. v 
 
 How much a Confirmation of this is to be wifhed, your own Curiofity 
 may make you judge, and here I leave it for the Opticians to determine. 
 
 I fhall content myfelf with obferving that Nature never leaves us without 
 
 K a fuffi- 
 
66 LETTER the SEVENTH, 
 
 a fufficient Guide to conduit us through all the necefi'ary Paths of Know- 
 ledge ; and it is far from abfurd to fuppofe Providence may have every 
 where throughout the whole Univerfe, interfperfed Modules of every 
 Creation, as our Divines tell us, Man is the Image of God himfelf. 
 
 Thus, Sir, you have had my full Opinion, without the leaf! Referve, 
 concerning the vifible Creation, confidered as Part of the finite Univerfe j 
 how far I have fucceeded in my defigned Solution of the Via La£iea y 
 upon which the Theory of the Whole is formed, is a Thing will hardly 
 be known in the prefent Century, as in all Probability it may require fome 
 Ages of OlMcrvation to difcover the Truth of it. 
 
 It remains that I fhould now give you fome Idea of Time and S.pace j 
 hut this will afford Matter fufficient for another Letter. 
 
 I am 3 &c. 
 
 LETTER 
 
 
( 6 7 ) 
 
 LETTER the EIGHTH. 
 
 Of Time and Space , with 
 
 regard to the known Objects of 
 Duration . 
 
 Immenfty and 
 
 SIR , 
 
 T HE Opportunity you gave me in your laft Vifit, of (liewing you 
 my general Scheme of the Univerfe, I find, befides the Pleafure 
 it then gave, is now attended with many ufeful Advantages. 
 
 I now not only hope to be better underftood for the future, but have 
 reafon to expert what I now write will merit your Attention more, and 
 have fome Title to your Approbation. The Ideas I have franfd of 
 Time and Space, will now more gradually fill your Imagination both 
 with Wonder and Delight, before they can arife fo high as to be loft in 
 an Eternity and the Infinity of Space. And I am fully perfwaded your far- 
 ther Inquiries into thefe vaft Properties of the Deity, will here be anfwered 
 intirely to your Satisfaction. You muft allow me now to be in fome 
 meafure a Judge of what I think will pleafe you moft, from the Obferva- 
 tions you have made upon my general Syftem, or otherwife you would have 
 reafon to think me perhaps too prefuming : But I flatter myfelf the great 
 Difficulty is now over ; and what remains to be faid, will alfo naturally 
 follow from what has gone before, that this Letter, I guefs, will go near 
 to furnilh you with all the Ideas you with to form upon the Subject, 
 To what you have faid of my having left out my own Habitation in my 
 Scheme of the Univerfe, having traveled fo far into Infinity as both to lofe 
 fight of, and forget the Earth, I think I may juftly anfwer as Arijiotle did 
 when Alexander , looking over a Map of the World, enquir’d of him for the 
 City of Macedon ; ’tis faid the Phiiofopher told the Prince, That the 
 Place he fought for was much too linall to be there taken Notice of, and 
 was not witnout fufficient Reafon omitted. 
 
 The Syftem of the Sun compar’d but with a very minute Part of the 
 vifible Creation, takes up fo l'mall a Portion of the known Univerfe, that 
 in a very finite View of the Immenfity of Space, I judg’d the Seat of the 
 Earth to be of very little Confequence, could I have poflibly reprefented 
 it, as not only being one of the fmalleft ObjeCls in our Regions, but in a 
 
 K 2 manner 
 
68 LETTER the EIGHTH. 
 
 manner infinitely lefs than even her own annual Orbit, and had nothing to 
 do with my main Defign, which was to reprefent all our planetary Worlds 
 as one collective Body, and begin my comparative Scale of Magnitude 
 from the Sun only and his Sphere of activity ; as the fmalleft ObjeCt I 
 could with any Propriety pretend to exprefs in fuch a Plan. 
 
 In fome Meafure to convince you that I have committed no Error 
 in this, I will try by fome lefs mathematical Method than that of meer 
 Numbers, to imprint an Idea in your Mind of the true Extent of the fo- 
 lar Syftem, and the Magnitude of all its moving Bodies, by natural Ob- 
 jects mod familiar to your Senfes. When we endeavour to form any Idea 
 of Diftance, Magnitude, or Duration, by Numbers only, we fo foon ex- 
 ceed the Limits of Conception, that this way we find our Faculties of 
 reafoning as finite as our Senfes j and no doubt 'tis right it fhould be fo, 
 Providence, as it were, having ordain’d that the firft fhould only attend 
 the laft, in fuch an adequate Degree to a determin’d Diflance j but what 
 Diftance or Degree of Knowledge is deftin’d to human Nature, none 
 but the Power that gave it can tell. ’Tis certain that beyond the third or 
 fourth Place of our Nomenclator, we receive but very faint Impreflions 
 of the thing expreft, and can frame fcarce any Notion at all of either 
 Number, Diftance, or Magnitude, fignified beyond it : Hence Aftro- 
 nomers are frequently oblig’d to have recourfe to mixt Ideas, and make 
 Things of different Natures and Properties affift each other, to excite 
 more adequate Ideas of what they would have conceived. Thus to ex- 
 prefs immenfe Diftances and Magnitude, they frequently apply themfelves 
 to Time and Motion j and vice verfa x to fignify a long Duration, they 
 have often recourfe to Diftance and Matter, removing, in Imagination, 
 Worlds of Sand, Grain after Grain, to fome remote known Region. 
 
 HeJiod y * to exprefs his Idea of the Diftance from his higheft Heaven 
 to Earth, and from Earth to Hell, or Tartarus, fuppofes an Anvil to be 
 let fall from one to the other, which he fays in nine natural Days would 
 reach the Earth from Heaven, and in the fame time would fall from the 
 Earth to Hell. ^ Homer makes his Vulcan fall from Heaven tothelfland 
 of Lemnos in much lefs Time, not exceeding one full artificial Day. 
 
 * From the high Heaven a brazen Anvil call. 
 
 Nine Nights and Days in rapid Whirls would laft. 
 
 And reach the Earth the Tenth, whence ftrongly hurl’d ; 
 
 The famethe Pafiage to th’ infernal World. 
 
 Cooke. 
 
 f Hurl'd headlong downward from th’ etherial Height ; 
 
 Tofs’d all the Day in rapid Circles round, 
 
 Nor till the Sun defcended touch’d the Ground. 
 
 Pope. 
 
 Modern 
 
LETTER the EIGHTH. 69 
 
 Modern Adronomers have made ufe of the fwifted Velocity of a Can- 
 non-Ball as continued thro’ the Space they would fo defcribe, and in this 
 Light, the Didance to the Sun has been by many compar’d to twenty- 
 five Years Motion of a Cannon-Ball, fuppofing it to travel at the Rate of 
 100 Fathom in a Moment, i. e. the Pulfe of an Artery ; and that a Jour- 
 ney fo performed to one of the neared fix’d Stars, would take the fame 
 Body at lead 100,000 Years before it could arrive there. But the Method 
 I have chofe to convey my Ideas of the Magnitude of the planetary Bo- 
 dies, and the Extent of the vifible Creation to you, I am willing to hope 
 you will find dill more familiar, comprehenfive, and eafy : And it only 
 depends upon your Remembrance of a very few known Objedts, and their 
 neighbouring Didances, which may be prefumed you are, or have been, 
 very well acquainted with. You have not only very lately but very often 
 been in Lojidon, and mud, I think, retain fome Idea of the Dome of St. 
 Paul' s, tho’ I own I ought not to be forry if you diould chance to have 
 forgot it, provided it might prove a Means of making your Vifits more 
 frequent. The Diameter of the Dome of this Church is 145 Feet: Now 
 if you can imagine this to reprefent the Surface of the Sun, a fpherical 
 Body 18 Inches diameter, will judly reprefent the Earth in like Propor- 
 tion ; and another of only five Inches diameter, will reprefent the Moon. 
 The Truths of thefe Proportions I have fhewn in my Claris Cale/lis-, and 
 the Reafon why I have here fixt upon the Dome of this Church for my 
 fird Objedt of Comparifon, will naturally appear from what follows. 
 
 From the Magnitude of the Earth on which we live, as from a known 
 Scale with refpedt to its Parts compar’d with our own Bodies, we natu- 
 rally frame our fird Ideas of Extent, and fix our Rationale of Remotenefs; 
 by which we are diffidently enabled to judge of all other fenfible Di- 
 dances within one finite View. And hence by the undoubted Principles 
 of Geometry, having fird given the Meafurement of the Earth in any 
 known Proportion with any other Quantity mod familiar to our Senfes, 
 and the Angle of Appearance, or Parallax to any perceivable Objedt, we 
 can eafily find in homogenial Parts its true Didance from the Eye. And 
 thus allowing for fome fmall tho’ unavoidable Errors, that may polfibly 
 arife from the Difficulties of Obfervation (efpecially fmall Angles and mi- 
 nute Quantities) we can always determine to a diffident, and very fre- 
 quently to a jud Exadtnefs, the relative Didance of all vifible Bodies, re- 
 mote or near, fuch as the Planets, Comets, and the Sun. 
 
 * In this Manner Adronomers having procur’d a comparative Standard, 
 reduc’d to fome known Meafure, as Englijh Miles, Leagues, Semi-Orbs or 
 
 Orbits, 
 
 * Parallax is the changeable Pofition of Bodies to different Situations of the Eye. Firft 
 •having found the Quantity of a Degree (u e. a 6oth Part of the Circumference) upon the 
 
 Earth’s 
 
jo LETTER THE EIGHTH. 
 
 Orbits, with all the Force of analogical Reafoning, clearly can demonftrate 
 the Place and Diftance of any Objed within the Reach of Obfervation, 
 and judge of Diftances almoft indefinite. 
 
 PLATE XXX. 
 
 Will help you to very corred Ideas of the real Magnitude of the Globe 
 of the Earth, compar’d with the juft Extent of the Ifland of Great -Britain, 
 which you will find with Ireland , and the reft of its Ifiands, feated near 
 the Center of the Projection. This as a Standard will enable you to judge 
 of all other Diftances more perfectly ; and firft I fhall confider that of 
 the Sun. 
 
 The Sun is found to be mean diftant from the Earth nearly 81 Mil- 
 lions of Miles, or 6877,5 Diameters of the Earth j and Saturn , the remo- 
 teft Planet from him is at his greateft Diftance from us about 858 Mil- 
 lions of Miles : Yet thefe Diftances are but the beginning of Space, and 
 only ferve to open our Ideas for farther Search. 
 
 The great Comet of 1680, as I have fome where faid before, was 
 found to move in fo vaft an excentrick Orbit, that in its aphelion Point 
 it would be 14,4 Times as far from the Sun, as the Orbit of Saturn, and 
 hence at leaft eleven thoufand and two hundred Millions of Miles from us. 
 Now fince the wife Creator hath fo difpos’d all the independent Parts of 
 the Creation, fuch as the feveral Syftems of primary and fecondary Pla- 
 nets, &c. at fo great a Diftance from each other, that the Laws of any one 
 in no wife fhall interfere, difturb, or interrupt the Principles of another; 
 this Comet, which we can eafily prove belong’d to our own Sun, we 
 may well imagine came not near any other ; and tho’ at that vaft Diftance 
 from the folar Body, yet Rill there muft have remain’d a Space fufficient 
 to divide or feperate the fenfible adivity of neighbouring Syfiems, that 
 they may not rufh upon each other. Hence we may reafonably fuppofe, 
 that the neareft Star can be no nearer than a triple Radius of its adive 
 Sphere ; and provided they are all in regular Order, and much of the fame 
 Magnitude with one another (which no Arguments can poffibly contra- 
 did) this Radius we may juftly make 2000 times the Diftance of our 
 Earth. For admitting the utmoft Limits of the Sun’s Attradion to ex- 
 ceed this Sphere of the Comets, as far as the Sphere of the Comets 
 
 Earth’s Surface, Aratofthenes difcover’d that the Magnitude of the whole was eafily known j 
 and then from the Moon’s horizontal Parallax having given the Radius of the Earth, the Dif- 
 tance of the Moon is foon detei mined ; next by the menftrual Parallax of the Lonar Orbit, 
 the Diftance of the Sun is found ; and by the Elongation of the inferior Planets, their mutual 
 Diftance from each other; and, laftly, from the annual Parallax of the Earth’s Orbit, all 
 the other. Orbits of the fuperior Planets are eafily found.. 
 
 exceeds 
 
LETTER the EIGHTH. 71 
 
 exceeds that of the Planets, which is nearly 14,4 times, the Radius of the 
 folar Syftem will be extended every way 200 Radius’s of the Orbit of Sa- 
 turn, and confequently the Diftance from Star to Star will not be lefs 
 than 6000 times the Radius of our Orbis Magnus, and confequently up- 
 wards of 480,000,000,000 Miles. That this is even lefs than the real 
 Truth, and may be defended as a very moderate Computation, ground- 
 ed upon Reafon, we have infallible Demonftration to witnefs, and make 
 appear as thus. 
 
 We know from the Nature of Diftance and Motion that the Stars may 
 have an annual Parallax, but it is fo very fmall, that the very beft Aftronomers 
 have never yet been able to affign what the Quantity really is. Yet it is 
 allow’d by univerfal Confent, that it can’t poffibly be more that one Mi- 
 nute of a Degree, and may probably be much lefs. Mr. Flamjiead, by re- 
 peated Obfervations, made it in fome of them upwards of 40 ,J but Mr. 
 Bradley has endeavour’d to prove it is every where too fmall to be de- 
 termined, and afiigns this Angle to another Caufe. This way then we 
 cannot make their Diftance lefs ; and to prove that it is fomething more 
 than I have faid it is, let us even increafe the doubtful Parallax of 40" to 
 the moft it poffibly can be, •viz. to 60" or Pj and by the Solution of 
 the Triangle, we fhall find that the neareft Star is 6875 times the Radius 
 of the Earth’s Orbit from the Sun : And this tho’ more than any other 
 Proportion makes them, is ftill undeniably lefs than the Truth, which 
 every Mathematician will of courfe be convinc’d of j and you yourfelf of 
 force muft believe, when you are told, that the fmaller the Angle of Pa- 
 rallax is, the farther the Body is remov’d from us. By which Rule, ac- 
 cording to Mr. Flamjiead ' s Obfervations, the Diftance muft be ftill greater : 
 By the optical Experiment of * Mr. Huygins, greater ftill than this ; and 
 according to Mr. Bradley , fo much more as not even too be determin’d. 
 
 Now if the reft are in general from each other, allowing the fame 
 Extent of Syftem, and as much to part the like Extreams of adive Vir- 
 tue, be in fuch Proportion of aerial Space, it will appear, that to pafs 
 from any one Star to another, we muft fly thro’ fo vaft a Trad of pure 
 Expanfe or Ether, that to vifit any one of the moft neighbouring Syftems, 
 could we travel even as faft as the fwifteft Eagle flies, for Inftance, 500 Miles 
 per Day, yet fhould we be 3,000,000 of Years upon our way before we 
 could arrive there ; and if continuing on to view the Regions of the reft 
 within the known Creation, Myriads of Ages would be fpent, and yet 
 we could not hope to fee the whole of but the fmalleft Conftellation. 
 
 * 27664 Radius’s of the Orlis Magnus , equal to the Diftance of Syrius, whofe Parallax 
 Ihould be to anfwer it but 14" 48"'. 
 
 But 
 
7 2 LETTER the EIGHTH. 
 
 But what Idea of Diftance can you receive from this fort of Eftima- 
 tion, where Numbers arife fo very high. I own to you mine are foon 
 quite loft by this Method of counting, either, Diftances or Duration. 
 I believe few People can range their Ideas with fuch Perfpicuity, as to 
 arrive at any adequate Notion of any Number above a thoufand. 
 
 To give you therefore a clearer Idea of Diftance, and imprefs the Pro- 
 portions of Space more ftrongly and fully in your Mind, let us fuppofe 
 the Body of the Sun, as I have faid before, to be reprefented by the Dome 
 of St. Paul's > in fuch Proportion a fpherical Body eighteen Inches Dia- 
 meter, moving at Mary-le-bone , will juftly reprefent the Earth, and ano- 
 ther of five Inches Diameter, defcribing a Circle of forty-five Feet and 
 a half Radius round it, will reprefent the Orbit and Globe of the Moon* 
 A Body at the Tower of 9,7 Inches, will reprefent Mercury j and one 
 of 17,9 Inches at St. James’s Palace will reprefent the Planet Venus j Mars 
 may be fuppofed at a Diftance, like that of Kenfmgton or Greenwich , 10 
 Inches Diameter : Jupiter , imagined to be at Hampton-Court, or Dart ford 
 in Kent j and Saturn , at Cliefden, or near Chelmsford : The firft repre- 
 fented by a Globe 1 5 Foot 4 Inches Diameter, the latter by one of 1 1 Feet- 
 and his Ring four Feet broad : Thefe would all naturally reprefent the 
 planetary Bodies of our Syftem in their proper Orbits and proportional 
 Magnitudes, as moving round the Cupola of St. Paul’s , as their common 
 Center the Sun. And preferving the fame natural Scale, the Aphelion 
 of the firft Comet would be about Bury, the fecond at Brijtol , and the 
 third near the City of Edinburgh. But if you will take into your Idea 
 one of the neareft Stars ; inftead of the Dome of St. Paul’ s, you muft 
 fuppofe the Sun to be reprefented by the gilt Ball upon the Top of it, and 
 then will another fuch upon the Top of St. Peter's at Rome reprefent one 
 of the neareft Stars. 
 
 The whole Syftem exhibited in the above Proportion, would be nearly, 
 as follows : 
 
 Diameter of the Sun 145 Feet. 
 
 Saturn 1 1,587, his Ring 27,54, its Breadth 4. 
 
 Jupiter, 15,39. 
 
 Mars, 10,15 Inches, 
 the Earth, 18,125. 
 
 Venus , 17,98 
 
 Mercury , 9,715 
 and the Moon, 4,93 
 
 Diftance 
 
73 
 
 LETTER the EIGHTH. 
 
 * Diftance of Saturn from the Sun, 27 Miles, and 1700 Yards. 
 
 15 Miles, and 458 Yards. 
 4 Miles, and 751 Yards. 
 2 Miles, and 1632 Yards. 
 2 Miles, and 217 Yards. 
 
 1 Mile, and 267 Yards. 
 
 ‘ Jupiter , 
 Mars , 
 
 the Earth 
 
 Venus , 
 
 Mercury , 
 
 and of the Moon, from us, 45 Yards and a half. 
 
 That of the moft diftant Comet 390, and the neareft of the Stars not 
 lefs than 6875, f Radius’s of the Or bis Magnus. 
 
 Now, if like Creations crowd the vaft Depths of Infinity, and if each 
 are adapted to receive Beings of different Natures, where rauft our Won- 
 der and Ideas have end ? 
 
 As it is evident in the Sign Taurus , in Perfeus , and Orion , that we 
 can plainly perceive Stars to the fixth and ninth Magnitude, the former 
 with our naked Eye, the other by the Help of Telefcopes, the vifional 
 ocular Creation cannot be lefs than 4,320,000,000,000 Miles in femi Dia- 
 meter, and admitting a regular Diftribution of thofe primordial Bodies 
 amongfl themfelves, the Depth, or moft remote Limits of the Vortex 
 Magnus from Side to Side, cannot be lefs than 8 m, m, 640 thoufand of 
 Million of Miles, admitting it is no more than what we fee j and laftly, 
 fuppofing our Syftem to be fituated nearly in the Middle of the Vortex 
 Magnus (which, from the vifible Order of the Stars, we may juftly con- 
 jecture, with the higheft Probability of Truth) the neareft Diftanceof the 
 Ens Primum, in the Realms of eternal Day, will rife to 30,000,000,000, 
 000 Miles, but more probably to 100,000,000,000,000 Miles, making 
 the Confines of Creation from Verge to Verge in the firft Cafe, upwards 
 of 68 Million of Millions of Miles, Diameter, and bythelaft above 200'. 
 But, if we compute the Diftance of the Stars after the Manner of Huy - 
 genSy for his Diftance of Syrius from the Sun, the Diftance of the Re- 
 gion of Immortality without exceeding Probability may rife to near 
 1,000,000,000,000,000 Miles. 
 
 Now to pafs by any progreffive Motion from the outward Verge, or 
 Borders of the Creation, thro’ theftarry Regions of Mortality, if I may call 
 
 * Of the Satellites of Saturn in the above Proportion. 
 
 And thofe of Jupiter. 
 
 The 
 
 o 
 
 it 
 
 * Radius, or Sign of 89 59 30 
 
 Sine fubftraft of o o 30 
 
 10,0000000 
 
 6,1626961 
 
 L 
 
 3,8373039 
 
 Hence the Diftance 6875,5 
 
 them 
 
74 LETTER the EIGHTH. 
 
 them fo, as far as the Center of the EmPrimum , or Sedes Beatorum , accord- 
 ing to Homer , or Milton's Manner of rneafuring Space, a Body falling, or 
 a Being moving with a Velocity but of 1000 Feet per Minute, i. e. at the 
 Rate of 20,000 Yards per Hour, or about 300 Miles per Day, would be at 
 lead: 300,000,00.0 Years upon its Journey thither, if not 1,000, m, and 
 perhaps much more, without offending Probability ; but even three Million 
 Centuries, or Ages, lure is enough to be employ’d, in paflingfrom one Place 
 to another ; therefore, we may conclude, the Soul mud: have fome other 
 Vehicle than can be found in the Ideas of Matter to convey it fo far, at 
 lead at once. Hence we may truly infer, that the Soul mud be immaterial,, 
 and that in all Probability there may be States in the Univerfe fo much 
 more longer lived than ours, that, compared with the Age of Man, the 
 Age of fuch Beings may be almod as an Eternity, or rather, as that of 
 the human Species to that of a Sun-born InfeCt.. 
 
 Again, if there are dill Stars beyond all thefe of other Denomination, 
 which we do not here perceive, how vadiy mud thefe Numbers be in- 
 creafed, to exprefs, almod without Idea, the amazing Whole of this one 
 vilible Creation ; but what has been already faid, I judge will be lufficient 
 to fhow the Immenfity of Space, and help you to conceive the flupendi- 
 ous Nature of an endlefs Univerfe j every where the home Poffeflion, 
 Production,, and indantaneous Care, of an infinite good Being, perfectly 
 wife, and powerful, of whom we can have no Idea more, than a Being in 
 dark Privation can have of Light, but through the Ludre of his own re- 
 fplendent Attributes.. 
 
 Thus, having attempted to enlarge your Ideas of the Creation in general, 
 and in fome meafure .having confidered the Indefinity of Space, I fhall in 
 the next Place proceed to give you fome Account of my Notions of Time, 
 
 As Didance is the Meafure of Magnitude and of all Extent, and helps our 
 Imagination to the Ideas of Space, fo are progreffive Moments the Meafure 
 of Velocity, and makes us-fenlible of Duration : And as Space may be ex- 
 tended through all Infinity, fo Time may be continued as to Eternity. This 
 Succeffion of temporal Ideas impreffed, or excited in the Mind, as an 
 EffeCt of Matter in Motion, producing a perpetual Change, both of Ob- 
 jects earthly and celedial, enables us not only to reflect upon pad Vicifli- 
 tudes of Nature, but from their regular Courfes, known Order and Returns, 
 predict Phenomena to come, and prove the periodical EffeCts of Na- 
 ture’s condant Laws fo jud and certain, that Time may be faid with 
 Truth, to co-exid with Motion. 
 
 Meafure being a certain Quantity of Senfation interwove with our Ideas 
 of Didance and Duration, proceeding from a Reflection of what is im- 
 preffed upon the Mind by fome external ObjeCt, I mud again return to 
 our Mother of Ideas the Earth, and from thence, as I did, of Didance, 
 
 frame 
 
LETTER the EIGHTH. 7 $ 
 
 frame the original Images beft fuited to the Underftanding, proper for our 
 Judgment of Duration. 
 
 Time takes its firft Denomination from the diurnal Rotation of the 
 Earth upon its Axis, which we call a natural Day, and this for obvious 
 Reafons we fubdivide in twenty-four Parts or Hours. This diurnal Mo- 
 tion haying been fucceflively repeated, and the Day renewed three hun- 
 dred and fixty-five Times, we find that all the vegetable World has gone 
 through all its Variegations, and Nature has again put on the fame Face, 
 adapted to the Seafon ; during which Time, and indeed which occafions 
 this general Change and Repetition, the Earth is found to make one intire 
 Revolution round the Sun. This Space, or Period of Time, we call a 
 folar, or rather a natural Year ; and from our Senfibility of this, and its con- 
 ftituent Parts, both horary and diurnal, we form our general Judgment 
 of Duration. 
 
 Saturn , the moft remote, and moft regular Planet inourSyftem, as has 
 been faid before, performs one Revolution round the Sun in about twenty- 
 nine of the above folar Years: The great Comet of 1680 makes but one 
 periodical Return in five hundred and feventy-five of thofe Years, and the 
 general Motion of the Stars, arifingfrom the Proceflion of the Equinoxes, 
 altogether continually changing their Afpedt, or Pofition, at the Rate of 
 50" per Year round the ecliptic Poles, compleats but one Revolution ill 
 25920 Years; in which Time the whole fidereal Frame of Heaven 
 has changed, and every Star returned to the fame Point of the folar Sphere 
 it fet out from. This is by many called the great Saturnian Year : Con- 
 cerning which, Mr. Addifon has thus tranflated an eminent Author. 
 
 When round the great Saturnian Year has turn’d, 
 
 In their old Ranks the wandering Stars fhall fland, 
 
 As when firft marfhall’d by the Almighty’s Hand. 
 
 Addison-. 
 
 Now, if this fidereal Revolution, arifing from a fecondary Caufe, require 
 this Number of Years to perfedt one Rotation, what muft their primitive 
 Orbits take to circumfcribe the Vortex Magnus. 
 
 It has been obferved, that the biggeft Star to us fcarce moves a Minute 
 in an hundred Years, and the moft remote as infenfibly for Ages, from 
 whence and what has been already faid of the imagined Diftance of the ge- 
 neral Center, we may frame this probable and well-grounded Guefs, that the 
 mean Revolution of a Star near the Middle of the Vortex Magnus , cannot be 
 made in lefs than a Million of Years, and though to us imperceptible, our 
 Sun in his own orbicular Direction, may be moving many Miles per Day. 
 Befides, if local Motion can be proved amongft the Stars, what lefs than an 
 Eternity can again reftore them to their original Order and primitive State. 
 
 , L 2 Such 
 
 1 
 
7 6 LETTER the EIGHTH. 
 
 Such vaft Room in Nature, as Milton finely exprefles it, cannot be with- 
 out its Ufe •, and nothing but absolute Demonftration is wanting (which 
 from their Nature and Distance cannot be expe&ed) to confirm the grand 
 Defign, fo fuited to theDeity’s infinite Capacity, and of eternal Benefit 
 to all his Creatures, efpecially Beings of a rational Senfe, and in particular 
 Mankind. 
 
 Of thefe habitable Worlds, fuch as the Earth, all which we may fup- 
 pofe to be alfo of a terreftrial or terraqueous Nature, and filled witb 
 Beings of the human Species, fubjedt to Mortality, it may not be amifs in. 
 this Place to compute how many may be conceived within our. finite 
 View every clear Star-light Night.. It has already been made appear,, that 
 there cannot poffibly be lefs than 1 0,000, oco Suns, or Stars, within 
 the Radius of the vifible Creation and admitting them all to have each 
 but an equal Number of primary Planets moving round them, it fol- 
 lows that there mu ft be within the whole celeftial Area 60,000,000 
 planetary Worlds like ours. And if to thefe we add thofe of the fe- 
 condary Clafs, fuch as the Moon, which we may naturally fuppofe 
 tp.attend particular primary ones, and every Syftem more or lefs of them 
 as well as here j, fuch Satellites may amount in the Whole perhaps to 
 
 1.00. 000.000.. or more, in all together then we may fafely reckon 
 
 1.70.000. 000* and yet be much within Compais, exclufive of the Comets 
 which I judge to be by far the moft numerous Part of the Creation. 
 
 In this great Celeftial Creation, the Catuftrophy of a World, fuch as 
 ours, or even the total Diftolution of a Syilem of Worlds, may poffibly 
 be no more to the great Author of Nature, than the moft common Ac- 
 cident in Life with us, and in all Probability fuch final and general Doom- 
 Days may be as frequent there, as even Birth- Days, or Mortality with us 
 upon the Earth.. 
 
 This Idea hasTomething fo chearful in it, that T own I can never look 
 upon the Stars without wondering why the whole World does not become 
 Aftronomer9 ; and that Men endowed with Senfe and Reafon, ffiould ne- 
 gledia Science they are naturally fo much interefted in, and fo capable of 
 inlarging the Underftanding,. as next to a Demonftration, muft convince 
 them of their Immortality, and reconcile them to all thofe little Difficulties 
 incident to human Nature, without the leaft Anxiety. 
 
 Such a Prothefis can fcarce be called lefs than an ocular Revelation, not 
 only fhewing us how reafonable it is to expedl a future Life, but as it were, 
 pointing out to us the Bufinefs of an Eternity, and what we may with the 
 greateft Confidence expeft from the eternal Providence, dignifying our 
 Natures with fomething analogous to the Knowledge we attribute to An- 
 gels ; from whence we ought to defpife all the Viciflitudes of adverfe.- 
 Eortune, which make fo many narrow-minded Mortals miferable. 
 
 I am now, &Co 
 
C 77 ) 
 
 LETTER the NINTH. 
 
 Reflexions, by Way of General Scolia, of Confequences relating to the Immor- 
 tality of the Soul y and concerning Infinity and Eternity . 
 
 SIR, 
 
 T HIS my laft Letter to you, I mean my final agronomical 
 one, I propofe as a General Scolia to the reft, the principle 
 Matter being Reflexions upon what is gone before, with fome 
 Conclufion naturally following or appendant to what has been already laid* 
 but which, I could not in any other Place, fo properly remark to you. 
 
 The Probability of the foregoing ConjeXures, chiefly built upon very 
 diftant Obfervations, fhew an apparent Neceffity for fome other kind of 
 DoXrine permitted by Providence, to give Mankind a Knowledge of 
 their Immortality and Dependance upon it, in the firft Ages of the 
 World. 
 
 And for the fame Reafon it evidently appears, that the ancient Phi- 
 lofophers had it not in their Power to prove a fupream Being and Di^ 
 reXor of all Things this Way. 
 
 And yet, as by a Sort of InftinX, or natural Reafon, and Confcioufnefs 
 of a good Principle , we fee how many noble Steps they made towards 
 it, and was convinc’d at laft of this great Truth , that fince there was a 
 Mind in fo imperfeX a Creature as Man, the perjeX Univerje , which 
 comprehended all Things, could not poflibly be without one ; and as 
 Sir Ifaac Newton has juftly obferved in his Principia , “ If every Par- 
 “ tide of Space be always , and every individual Moment of Duration 
 “ every where furely the Maker and Lord of all Things, cannot be never 
 “ and no where.” 
 
 To make manifeft the infinite Empire and Agency of God, from ce- 
 leftial Motion, became the Tafk, but of very late Years j and I can’t help 
 being of Opinion, that by means of thefe primary Bodies, only, we fhall 
 at length be able to trace the greater Circulations, and Laws of Nature, to 
 their real original and fountain Head. 
 
 Thefe 
 
7 8 LETTER the NINTH. 
 
 Thefe, were any thing wanting, befides the Miracle ourfelves , to con- 
 vince us of a divine Origination, are all infallible Proofs, that the Univerfe 
 is governed by an intelligent and all-powerful Being, whofe Exiftence is too 
 nearly related to a felf-evident Truth to be more clearly demonftated, than 
 it is manifeft of itfelf, both from the particular Laws of Nature, and the ge- 
 neral Order of Things. An Argument which has been thought of no fmall 
 Force, and well worth obferving in the Infancy of Chriftianity. Theinvi- 
 fible Things of God are clearly fecn, being underflood by the Things that 
 are made , even his eternal Power and Godhead. Rom. i. 20. 
 
 But ’tis now high time to look back upon my Theory, and tell you 
 it is a vain Suppofirion, to imagine I (hall ever be able to convince every 
 Reader, either of the Truth or Probability of what I have advanced to 
 you : Mathematical Afliftance not being to be expected, where perhaps 
 it has never been thought of j and I allow you, it is much more rea- 
 fonable to expeCt, that fifty Perfons will read thefe Letters without per- 
 ceiving the Reafonablenefs of them, than that five fhould confider them 
 with proper Judgment. 
 
 I muft ingenuoully confefs to you, that nothing is wanting to convince 
 me intirely of the Certainty of what I here advance by way of Con- 
 jecture to you. But this you mull only look upon as an happy Partiality, 
 which generally attends all Authors, and always will be the chief Support 
 of their tedious Labours. I afiiire you, I have neither Hopes nor Expec- 
 tation, no, not the weak Breath of a Wifh, to be admitted a proper 
 judge of my own Works. But I lhall always take their Imperfection to be 
 rather, (like my own Faults) to be too near me to be feen - y I therefore 
 truft all to my Friend, and if I am fo fortunate as to excite his Appro- 
 bation, I fhall think myfelf very happy in a very favourite Point ; which is, 
 The advancing nothing which a rational Reader would willingly overlook, 
 or be ignorant of. 
 
 But if I have been fo happy as to come fo near the Mark, as to border 
 upon Truth, I believe you will allow me to carry my Conjectures a little 
 further, and point out fome farther pleating Confequences, which I begin 
 to perceive may naturally follow. 
 
 Should it be granted, that the Creation may be circular or orbicular, 
 I would next fuppofe, in the general Center of the whole an intelligent 
 Principle, from whence proceeds that myfiick and paternal Power, pro- 
 ductive of all Life, Light, and the Infinity of Things. 
 
 Flere the to-all extending Eye of Providence, within the Sphere of its 
 Activity, and as omniprefently prefiding, feated in the Center of Infinity, 
 I would imagine views all the ObjeCis of his Power at once, and every 
 Tiling immediately direCt, difpenfinginftantaneoufly its enliveninglnfiuence, 
 
 to 
 
 
LETTER the NINTE 79 
 
 to the remoteft Regions every where all round. I know you’ll fay Aftro- 
 nomers are never to be fatisfied, and I muft own where there is fo much, 
 rational Entertainment for the human Mind, and fo fuitable to the 
 true Dignity of God, and moft worthy of Man,, it is not eafy to* 
 know where to flop in fuch a Scene of Wonders. 
 
 Having, I fay, once granted that all the Stars may move round one 
 common Center, I think it is very natural to one, who loves to purfue. 
 Nature as far as we may, to enquire what moft likely may be in that 
 Center; for fince we muft allow it to be fir fuperior to any other Point 
 of Situation in the known Univerfe, it is highly probable, there may be 
 fome one Body of liderial or earthy Subftance leated there, where the divine- 
 Prefence, or fome corporeal Agent, full of all Virtues and Perfections, 
 more immediately preftdes over his own Creation. And here this pri- 
 mary Agent of the omnipotent and eternal Being, may fit enthroned, as 
 in the Primum Mobile of Nature, aCHng in Concert with the eternal 
 Will. To this common Center of Gravitation, which may be fuppofed 
 to attract all Vertues,, and repel all Vice, all Beings as to Perfection 
 may tend and from hence all Bodies firft derive their Spring of ACtion, 
 and are directed in their various Motions. 
 
 Thus in the Focus y . or Center of Creation, I would willingly introduce 
 a primitive Fountain, perpetually overflowing with divine Grace, from 
 whence all the Laws of Nature have their Origin, and this I think would 
 reduce the whole Univerfe into regular Order and juft Harmony, and 
 at the fame time, inlarge our Ideas of the divine Indulgence, open our 
 ProfpeCt into Nature’s fair Vineyard, the vaft Field of all our future 
 Inheritance. 
 
 But what this central Body really is, I fhall not here prefume to fay, 
 yet I can’t help obferving it muft of Neceflity, if the Creation is real and 
 not merely Ideal, be either a Globe of Fire fuperior to the Sun, or 
 otherwife a vaft terraqueous or terreftial Sphere, furrounded with an 
 /Ether like our Earth, but more refined,, tranfparent and ferene. Which 
 <6f thefe is moft probable, I fhall leave undetermined, and muft acknow- 
 ledge at the fame time, my Notions here are fo imperfeCt, I hardly dare 
 conjecture. ’Tis true, I have ventur’d to think it may be one of thefe, 
 and fince fo glorious a Situation can hardly be fuppofed without its pro- 
 per Inhabitants, ’tis moft natural to conclude it may be the latter. In 
 the firft Cafe, befides our having no Idea of Beings exifting in Fire, it 
 would not, notwithftanding its Diftance, be fo eafy to account for its being 
 invilible ; and fince the Luftre of the Stars are all innate, they could 
 receive no Benefit from it, and confequently fuch a Nature as a folar Com- 
 pofition, muft. in this Place be render’d ufelefs 3 but in the latter Sup- 
 
 pofition. 
 
8.o LETTER the NINTH, 
 
 pofition of its being a dark Body, we have no Difficulty attending us, 
 having feveral Inftances of like Bodies, moving round an opaque one. 
 Now when we confider, that all thofe radient Globes, which adorn the 
 Skies, thofe bright aetherial Sparks of elemental Fire, thick ftrewed like 
 Seeds of Light all round our Hemifphere, are each to us the Embrio 
 of a glorious Sun j how awful and ftupendious muft that Region be, 
 where all their Beams unite and make one inconceivable eternal Day ? 
 
 Though the Deity, fays a learned Writer <f be effentially prefent thro’ 
 “ all the Immenlity of Space, there is one Part of it in which he difco- 
 “ vers himfelf in a mod: tranfcendent and vifible Glory. This is that Place 
 <f which is mark’d out in Scripture, under the different Appellations 
 “ of Paradice ; the third Heaven •, the 'Throne of God, and the Habi- 
 “ tat ion of his Glory." 
 
 This continues the fame Author, is “ that Prefence of God, which 
 :tt fome of the Divines call his glorious, and others his majeftick Pre- 
 xc fence/’ 
 
 It is here, and here only, as in the Center of his infinite Creations, 
 where he refides in a fenfible Magnificence, and in the midft of thofe 
 Splendors, which can Effed the Imagination of his Creatures j and though 
 the mod: facred and fupreme Divinity be allowed as effentially prefent in 
 all other Places as well as in this, as being a Being whofe Center is every 
 where, and Circumference no where $ yet it is here only, or in fuch 
 Senforium of his Unity, where he manifeffs his corporeal Agency, 
 as in the Foci of his infinite Empire over all created Beings. It is to 
 this majedick Prefence of God, we may apply thofe beautiful Expreffions 
 of Scripture, “ Behold even to the Moon and it Jhineth not ; yea the Stars 
 “ are not pure in his Sight” 
 
 “ The Light of the Sun, and all the Glories of the World, on which 
 “ we live, are but as weak and fickly Glimmerings, or rather Dark- 
 “ nefs it felf, in Comparifon of thofe Splendors, which encompafs this 
 “ Throne of God.” 
 
 Here Heav’ns wide Realms an endlefs Scene difplays, 
 
 And Floods of Glory thro’ its Portals blaze j 
 The Sun himfelf lod: in fuperior Light, 
 
 No more renews the Day, or drives away the Night : 
 
 The Moon, the Stars, and Planets difappear, 
 
 And Nature fix’t makes one eternal Year. 
 
 Here and here alone center’d in the Realms of inexpreffible Glory, we 
 juftly may imagine that primogenial Globe or Sphere of all Perfedions, 
 
 fubjed 
 
LETTER the NINTH. Si 
 
 fubjeCt to the Extreams of neither Cold nor Hear, 'of eternal Temperance 
 and Duration. Here we may not irrationally fuppofe the Vertues of the 
 meritorious are at laft rewarded and received into the full Pofleftion of 
 every Happinefs, and to perfed: Joy. The final and immortal State ordain’d 
 for luch human Beings, as have paflcd this Vortex of Probation thro’ all. 
 the Degrees of human Nature with the fupream Applaufe. 
 
 What vaft room is here, for infinite Power and Wii'dom to adt in, and 
 that fo vifibly takes Delight to bids all his Beings with his Bounty. And 
 endlefs as his Prefcience, Attributes, and Goodnefs, are undoubtedly all 
 thofe natural and apparent Joys with which he manifefts his Love to all 
 his Creatures, a Multiplicity of Objeds not to be enumerated. For where-' 
 foever we turn our Eyes, and follow with our Reafon, we may meet with 
 Worlds of all Formations, fuited no doubt to all Natures, Tables, and 
 Tempers, and every Clals of Beings. 
 
 Here a Groupe of Worlds, all Vallies, Lakes, and Rivers, adorn’d with 
 Mountains, Woods, and Lawns, Cafcades and natural Fountains ; there Worlds 
 all fertile Iflands, cover’d with Woods, perhaps upon a common Sea, 
 and fill’d with Grottoes and romantick Caves. This Way, Worlds all 
 Earth, with vaft extenfive Lawns and Viftoes, bounded with perpetual 
 Greens, and interfperfed with Groves and Wilderneftes, full of all Varieties 
 of Fruits and Flowers. That World fubfifting perhaps by foft Rains, this 
 by daily Dews, and Vapours ; and a third by a central, fubtle Moifture, 
 arifing like an Effluvia, through the Pores and Veins of the Earth, and 
 exhaling or abforbing as the Seafon varies to anfwer Nature’s Calls. 
 Round fome perhaps, fo denfe an Atmofphere, that the Inhabitants may 
 fly from Place to Place, or be drawn through the Air in winged Cha- 
 riots, and even fieep upon the Waves with Safety; round others pofflbly, 
 fo thin a fluid, that the Arts of Navigation may be totally unknown to it, 
 and look’d upon as impracticable and abfurd, as Chariot flying may be 
 here with us j and fome where not improbably, fuperior Beings to the hu- 
 man, may refide, and Man may be of a very inferior Clafs j the fecond, . 
 third, or fourth perhaps, and fcarce allow’d to be a rational Creature. 
 Worlds, with various Moons we know of already ; Worlds, with Stars 
 and Comets only, we equally can prove is very probable ; and that there 
 may be Worlds with various Suns, is not impoffible. And hence it is 
 obvious, that there may not be a Scene of Joy, which Poetry can paint, 
 or Religion promife ; but fomewhere in the Univerfe it is prepared for 
 the meritorious Part of Mankind. Thus all Infinity is full of States of 
 Bails j Angelic Choiis, Regions of Heroes, and Realms of Demi-Gods; 
 Elyfian Fields, Pindaric Shades, and Myriads of inchan ting Manfions, 
 
 M l not 
 
g 2 LETTER THE NINTH. 
 
 not to be conceived either by Philofopby or Fancy, affifled by the ftrongeft 
 Genius and warmeft Imagination. 
 
 All harmonioufly crowded and provided with every Objedt of Bea- 
 titude, that Friendfhip, Love, or Society can infpire, the Mufes or the 
 Graces Frame ; and all as permanent and perfedt, that is deftin’d to a 
 Duration, fuited to the Nature of their Exigence and Degree of Cogni- 
 fance ; for as a very learned Writer obferves upon this fame Subjedt j 
 
 ** How can we tell, but that there may be above us Beings of greater 
 <c '•Powers, and more perfedt Intelledts, and capable of mighty Things, 
 
 “ which yet may have corporeal Vehicles as we have, but finer and 
 “ invifble ? Nay, who knows, but that there may be even of thefe 
 “ many Orders, rifing in Dignity of Nature, and Amplitude of Power, 
 “ one above another ? It is no Way below the Philofophy of thefe Times, 
 “ which feems to delight in inlarging the Capacities of Matter, to aflert 
 “ the Poffibility of this." 
 
 ■From thefe amazing Ideas of Space in general, and from the particu- 
 lar Diftance of the Stars, which feparates as it were, one Syftem of 
 Bodies from another, and by fo prodigious an extent, as fcarce to be 
 fuppos’d a temporal Talk. I think it naturally follows, had we no other 
 Way to prove it, or any other Reafon to believe it, that the Soul mufl of 
 Neceffity be immaterial ; for as this Space feems fo impaffible to Matter, 
 as not to be undertaken and performed without the Lofs of Ages, in a 
 State only of Tranfmigration, we may well imagine, that Change of 
 Place is not effedted this Way, but by fome other Vertue or Property, 
 more immediate, if not inftantaneous. 
 
 I own next to Annihilation is the State of Oblivion, and this Way we 
 may folve all Difficulties with regard to our being fenfible of fuch a Lofs 
 of Exigence j but if we allow the Soul to be immaterial, it no longer 
 has any thing to do with Space, but as operating by Refledtion only, or 
 the Faculty of Thinking j it may be like the Imagination where it pleafes 
 in a Moment. 
 
 Objedts of the Mind abftradted from the Senfes of the Body, has no 
 real or comparative Magnitude that is, I would lay, an Inch, a Foot, 
 a Yard, a Mile, or a Million of Miles are all equally indefinite, and is 
 thus prov’d j every finite Line is formed of an infinite Number of Points, 
 and no finite Line can be folv’d into more. Thus if you will allow me 
 the Expreffion, the Mind being magnified as all Objedts are diminiffied, 
 what feems impradticable in the natural State of Things, in an Ideal one, 
 becomes very poffible ; that is, to make myfelf more intelligible, though 
 we can hardly conceive, how any Being can pafs from Syrins to the Sun, by 
 natural Laws in their proper State, yet if proportionally reduced by a 
 
 new 
 
LETTER the NINTH. 83 
 
 new Modification of Ideas, to the Bignefs of a Ball 6 Feet Diameter, 
 and to be only 680 Miles afunder j the Thing is very comprehenfivc 
 and eafy. 
 
 Hence Vifion, Light, and Electrical Virtue, feem to be propagated 
 with fuch Velocity, that nothing but God can poffible be the Vehicle ; 
 and hence we may juftly fay with St. Paul , Afts xvii, 28. In him we 
 live , in him we move , in him we have our Being. 
 
 It will further appear, from the foregoing Letters, that all the Stars 
 and planetary Bodies within the finite View, are altogether but a very 
 minute Part of the whole rational Creation ; I mean that vaft collective 
 Body of habitable Beings, which I have endeavoured to demonftrate, are 
 all govern’d by the fame Laws, though varioufly revolving round one 
 common Center, in which Center we may not impertinently venture 
 to fuppofe the prime Agent of our Natures j or otherwite, the moll 
 perfect of all created Beings, illimitable in his Ideas and Faculties of 
 Senfation particularly prefide. 
 
 But tho’ pad all diffus’d, without a Shore 
 His Effence j local is his Throne, (as meet) 
 
 To gather the difperft, (as Standards call 
 The lifted from afar ) to fix a Point j 
 A central Point, collective of his Suns, 
 
 Since finite ev’ry Nature, but his own. Dr. Toung . 
 
 And farther fince without any Impiety j fince as the Creation is, fo is 
 the Creator alfo magnified, we may conclude in Confequence of an In- 
 finity, and an infinite all-aCtive Power ; that as the vifible Creation is 
 fuppofed to be full of fiderial Syftems and planetary Worlds, fo on, in like 
 fimilar Manner, the endlefs Immenfity is an unlimited Plenum of Creations 
 not unlike the known Univerfe. See Plate XXXI. which you may if you 
 pleafe, call a partial View of Immenfity, or without much Impropriety 
 perhaps, a finite View of Infinity, and all thefe together, probably diver- 
 fified; as at A, B and C. in Plate XXXII. which reprefents their Sections, 
 if all may be a proper Term for an infinite or indefinite Number, we may 
 juftly imagine to be the ObjeCt of that incomprehenfible Being, which 
 alone and in himfelf comprehends and conftitutes fupreme Perfection. 
 
 That this in all Probability may be the real Cafe, is in fome Degree 
 made evident by the many cloudy Spots, juft perceivable by us, as far 
 without our ftarry Regions, in which tho’ vifibly luminous Spaces, no one 
 Star or particular conftituent Body can pofiibly be diftinguifhed ; thofe in 
 
 all 
 
8 4 LETTER the NINTH. 
 
 all likelyhood may be external Creation, bordering upon the known one,, 
 too remote for even our Telefcopes to reach. 
 
 With the raptur’d Poet may we not juftly fay 
 
 O, what a Root ! O what a Branch is here ! 
 
 O what a Father ! what a Family ! 
 
 Worlds! Syftems ! and Creations ! 
 
 And in Confequence of this 
 
 In an Eternity, what Scenes (hall ftrike ?' 
 
 Adventures thicken ? Novelties furprize ? 
 
 What Webs of Wonder fhall unravel there ? 
 
 Night Thoughts . . 
 
 So many varied Seats where every Element may have its proper Beings 
 and all adapted to partake of every thing fuited to their Natures, argue 
 fuch Maturity of Wifdom, and the vafl Production fuch myfterious 
 Power j ’tis hardly, poflible for Mortals not to fee divine Intelligence 
 prefide, and that every Being fomewhere mull be happy. 
 
 A Univerfe fo well defigned, and fill’d with fuch an endlefs Structure 
 of material Beings, and all the Refult of Prefcience and infinite reflected 
 Reafon, flowing from a Mind all perfeCt, full of all Ideas, could never 
 be defigned in vain ; and tho’ our narrow Bounds of Reafon limited, 
 by finite Senfes, cannot direCtly fee the Confequence dependant on a Sequel, 
 yet from what we do fee, great Room we have to hope the, next Stage of 
 Exiflence will be more lafting and more perfeCt; and it is highly proba- 
 ble, the nobleft Suggeftion of the molt luxuriant Fancy may fall infi- 
 nitely fhort of what we are defigned for. 
 
 But here, even in this World, are Joys which our Ideas of Heaven can 
 fcarce exceed, and if Imperfection appear thus lovely, what muft Perfection 
 be, and what may we not expeCt and hope for, by a meritorious Acqui- 
 efcence in Providence, under the Direction, Indulgence, and Protection 
 of infinite Wifdom and Goodnefs, who manifeftly defigns perfeCt Felicity, , 
 as the. Reward of Virtue in all his Creatures, and will, at proper Periods 
 anfwer all our Wifhes in fome predefined World. 
 
 All this the vaft apparent Provifion in the ftarry Manfions, feem to pro- 
 mife : What ought we. then not to do, to prefer ve our natural Birthright to 
 it and to merit fuch Inheritance, which alas we think created all to gra*r 
 tify alone, a Race of vain-glorious gigantick Beings, while they are con- 
 fined to this World, chained, like io many Atoms to a Grain of Sand. 
 
 Tam, &c. . 
 
PL ATE. I 
 
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