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<NAME>John Pas</NAME>
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<PB N="1" REF="1" MS="y">
<HEAD>May it Plea&s;e THE KING'S MOST EXCELLENT MAJESTY.</HEAD>
<P>I Could not have pre&s;umed to approach your Maje&s;ties Royall Pre&s;ence with a Book of this Nature, had I not been a&s;&s;ured that, when the weighty Affairs of your Government permit it, your Maje&s;ty has frequently &s;hewn your &s;elf enclined to favour <HI>Mechanical</HI> and <HI>Philo&s;ophical</HI> Di&s;coveries: And I may be bold to &s;ay, that if ever Book was worthy the favourable acceptance of a Prince, this wherein &s;o many and &s;o great Di&s;coveries con|cerning the con&s;titution of the Vi&s;ible World are made out, and put pa&s;t di&s;pute, mu&s;t needs be grateful to your Maje&s;ty; e&s;pe|cially being the Labours of a worthy Subject of your own, and a Member of that <HI>Royall Society</HI> founded by your late Royall Brother, for the advancement of Natural Knowledge, and which now Flouri&s;hes <GAP DESC="illegible" EXTENT="1 letter">nder your Maje&s;ties mo&s;t Gracious Protection.</P>
<PB REF="2" MS="y">
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<P><PB N="2" REF="3">But being &s;en&s;ible of the little Lei&s;ure which Care of the Pub|lick leaves to Princes, I believed it nece&s;&s;ary to pre&s;ent with the Book a &s;hort Extract of the Matters conteined, together with a <HI>Specimen</HI> thereof, in the genuine Solution of the Cau&s;e of the <HI>Tides</HI> in the Ocean; a thing frequently attempted, but till now without &s;ucce&s;s: Whereby your Maje&s;ty may judge of the re&s;t of the performances of the Author.</P>
<P>The &s;ole Principle upon which this Author proceeds to explain mo&s;t of the great and &s;urpri&s;ing appearances of Nature, is no o|ther than that of <HI>Gravity,</HI> whereby in the Earth all Bodies have a tendency towards its Center; as is mo&s;t evident: and from undoubted Arguments its proved, that there is &s;uch a Gravitati|on towards the Centers of the Sun, Moon and all the Planets.</P>
<P>From this principle, as a nece&s;&s;ary con&s;equence, follows the Sphaerical Figure of the Earth and Sea, and of all the other Cae|le&s;tial Bodies: and tho' the tenacity and firmne&s;s of the Solid Parts &s;upport the inequalities of the Land above the level; yet the Fluids, pre&s;&s;ing equally and ea&s;ily yeilding to each other, &s;oon re&s;tore the <HI>Aequilibrium,</HI> if di&s;turbed, and maintain the exact Figure of the Globe.</P>
<P>Now this force of De&s;cent of Bodies towards the Center is not in all places alike, but is &s;till le&s;s and le&s;s, as the di&s;tance from the Center encrea&s;es: and in this Book it is demon&s;trated, that this force decrea&s;es as the Square of the di&s;tance increa&s;es; that is, the weight of Bodies and the force of their Fall is le&s;s, in parts more removed from the Center, in the proportion of the &s;quares of the di&s;tance. So as for Example, a Tun weight on the &s;urface of the Earth, if it were rai&s;ed to the height of 4000 miles, which I &s;uppo&s;e the &s;emidiameter of the Earth, would weigh but &frac14; of a Tun or 5 hundred weight: if to 12000 miles or 3 &s;emidi|ameters from the &s;urface, that is 4 from the center, it would weigh but 1/16 part of the weight on the &s;urface, or a hundred and quarter: So that it would be as ea&s;y for the &s;trength of
<PB N="3" REF="3">
a man, at that height, to carry a Tun weight, as here to carry a hundred and quarter. And in the &s;ame proportion does the Velocities of the fall of Bodies decrea&s;e: for whereas on the &s;ur|face of the Earth all things fall 16 foot in a &s;econd, at one &s;e|midiameter above this fall is but 4 foot; and at 3 &s;emidiameters, or 4 from the center it is but 1/16 of the fall at the &s;urface, or but one foot in a &s;econd: and at greater di&s;tances both weight and fall become very &s;mall, but yet at all given di&s;tances is &s;till &s;ome thing, tho' the effect become in&s;en&s;ible. At the di&s;tance of the Moon (which I will &s;uppo&s;e 60 &s;emidiameters of the Earth) 3600 pounds weigh but one pound, and the fall of Bodies is but 16/3600 of a foot in a &s;econd, or 16 foot in a minute; that is, a body &s;o far off de&s;cends in a minute no more than the &s;ame at the &s;urface of the Earth would do in a &s;econd of Time.</P>
<P>As was &s;aid before, the &s;ame force decrea&s;ing after the &s;ame manner is evidently found in the Sun, Moon and all the Planets; but more e&s;pecially in the Sun, who&s;e force is prodigious; be|coming &s;en&s;ible even in the immen&s;e di&s;tance of <HI>Saturn:</HI> This gives room to &s;u&s;pect that the force of Gravity is in the Cele&s;tial Globes proportional to the quantity of Matter in each of them: and the Sun being at lea&s;t ten thou&s;and times as bigg as the Earth, its Gravitation or attracting Force, is found to be at lea&s;t ten thou&s;and times as much as that of the Earth, acting on Bodies at the &s;ame di&s;tances.</P>
<P>This law of the decrea&s;e of Gravity being demon&s;tratively proved, and put pa&s;t contradiction; the Author with great Sa|gacity inquires into the nece&s;&s;ary con&s;equences of this Suppo&s;i|tion; whereby he finds the genuine cau&s;e of the &s;everal appear|ences in the Theory of the Moon and Planets, and di&s;covers the hitherto unknown laws of the Motion of Comets and of the Ebbing and Flowing of the Sea. Each of which are &s;ubjects that have heretofore taken up much larger Volumes, but truth being uniforme and alwaies the &s;ame, it is admirable to ob&s;erve how
<PB N="4" REF="4">
ea&s;ily and how &s;atisfactorily Solutions are given in very ab&s;tru&s;e and difficult matters, when once true and genuine Principles are obtained: And on the other hand it may be wondred that, not|with&s;tanding the great facility of truth, and the perplexity and noncon&s;equences that alwaies attend erronious &s;uppo&s;itions, the&s;e great di&s;coveries &s;hould have e&s;caped the Acute di&s;qui&s;itions of the be&s;t Philo&s;ophical Heads of all pa&s;t ages, and be re&s;erved to be recorded to Po&s;terity, among the Glorious Acqui&s;itions your Nations ju&s;tly promi&s;e them&s;elves, during the cour&s;e of your Maje&s;ties happy Reign over us:</P>
<P>The Theory of the Motion of the primary <HI>Planets</HI> is here &s;hewn to be nothing el&s;e, but the contemplation of the Curve Lines which Bodies ca&s;t with a given velocity, in a given direction, and at the &s;ame time drawn towards the Sun by its gravitating Power, would de&s;cribe. Or, which is all one, that the Orbs of the Pla|nets are &s;uch Curve Lines as a &s;hot from a Gun de&s;cribes in the Air, being ca&s;t according to the direction of the Piece, but bent into a crooked Line by the &s;upervening tendency towards the Earths Center: And the Planets being &s;uppo&s;ed to be projected with a given force, and attracted towards the Sun, after the a|fore&s;aid manner, are here proved to de&s;cribe &s;uch Figures as an|&s;wer punctually to all that the Indu&s;try of this and the la&s;t Age has ob&s;erved in the Planetary Motions. So that it appears that there is no need of &s;olid Orbs and Intelligences, as the Ancients imagined, nor yet of <HI>Vortices</HI> or Whirlpools of the Cele&s;tial Mat|ter, as <HI>Des Cartes</HI> &s;uppo&s;es; but the whole affair is &s;imply and Mechanicall performed, upon the &s;ole &s;uppo&s;ition of a gravita|tion towards the Sun; which cannot be denied.</P>
<P>The Motion of <HI>Comets</HI> is here &s;hewn to be compounded of the &s;ame Elements, and not to differ from Planets, but in their greater &s;wiftne&s;s, whereby overpowering the gravity that &s;hould hold them to the Sun, as it does the Planets, they flie off againe, and di&s;tance them&s;elves from the Sun and Earth, &s;o that they &s;oon are
<PB N="5" REF="4">
out of &s;ight: and the fewne&s;s and inaccuracy of the ob&s;ervati|ons Antiquity has left us, are not &s;ufficient to determine whether the &s;ame Comet ever return again. But this Author has &s;hewn how Geometrically to determine the Orb of a Comet from ob|&s;ervations, and to finde his di&s;tance from the Earth and Sun, which was never before done.</P>
<P>The third thing here done is the Theory of the Moon, all the Inequalities of who&s;e motion are proved to ari&s;e from the &s;ame principles, only here the effect of two centers operating on or attracting a projected body comes to be con&s;idered; for the Moon tho' principally attracted by the Earth and moving round it, does together with the Earth move round the Sun once in a Year, and is according as &s;he is nearer or farther from the Sun, drawn by him more or le&s;s than the Center of the Earth, about which &s;he moves; whence ari&s;e &s;everal irregularities in her motion, of all which the Author in this Book, with no le&s;s &s;ub|tilty than Indu&s;try, has given a full account. And tho' by rea|&s;on of the great complication of the problem, he has not yet been able to make it purely Geometrical, tis to be hoped, that in &s;ome farther E&s;&s;ay he may &s;urmount the difficulty, and having perfected the Theory of the Moon, the long de&s;ired di&s;covery of the Longitude (which at Sea is only practicable this way) may at length be brought to light, to the great honour of your Maje&s;ty and advantage of your Subjects.</P>
<P>All the &s;urprizing Phenomena of the Flux and Reflux of the Sea are in like manner &s;hewn to proceed from the &s;ame princi|ple; which I de&s;ign more largely to in&s;i&s;t on, &s;ince the matter of fact is in this ca&s;e much better known to your Maje&s;ty than in the foregoing.</P>
<P>If the Earth were alone, that is to &s;ay, not affected by the actions of the Sun and Moon, it is not to be doubted but the Ocean be|ing equally pre&s;&s;ed by the force of Gravity towards the center, would continue in a perfect &s;tagnation, always at the &s;ame hight,
<PB N="6" REF="5">
without ebbing or flowing; But it being not to be denied that the Sun and Moon have a like principle of Gravitation towards their Centers, and that the Earth is within the activity of their attractions, it will plainly follow that the equality of the pre&s;|&s;ure of Gravity towards the Center will thereby be di&s;turbed; and tho' the &s;mallne&s;s of the&s;e forces, in re&s;pect of the Gravita|tion towards the Earths Center, renders them altogether imper|ceptible by any experiments we can devi&s;e, yet the Ocean being fluid and yeilding to the lea&s;t force, by its ri&s;ing &s;hews where it is le&s;s pre&s;t, and where it is more pre&s;t by its &s;inking.</P>
<P>Now if we &s;uppo&s;e the force of the Moons attraction to de|crea&s;e as the &s;quare of the di&s;tance from its Center increa&s;es (as in the Earth and other Cele&s;tial Bodies) we &s;hall find, that where the Moon is perpendicularly either above or below the Horizon, either in Zenith or Nadir, there the force of Gravity is mo&s;t of all dimini&s;hed, and con&s;equently that there the Ocean mu&s;t ne|ce&s;&s;arily &s;well by the coming in of the water from tho&s;e parts where the pre&s;&s;ure is greate&s;t, <HI>viz.</HI> in tho&s;e places where the Moon is near the Horizon: But that this may be the better under&s;tood, I thought it needful to add the following Figure, where <HI>M</HI> is the Moon, <HI>E</HI> the Earth, <HI>C</HI> its Center, and Z the place where the Moon is in the Zenith, <HI>N</HI> where in the Nadir.</P>
<P><FIGURE>
</FIGURE></P>
<P>Now by the Hypothe&s;is, it is evident that the Water in Z being nearer, is more drawn by the Moon than the Center of the Earth <HI>C,</HI> and that again more than the water in <HI>N,</HI> wherefore the water in Z has a tendency towards the Moon, contrary to that of Gravity, being equal to the exce&s;s of the Gravitation in Z above that in <HI>C:</HI> And in the other ca&s;e, the water in <HI>N,</HI> tending
<PB N="7" REF="5">
le&s;s towards the Moon that the Center <HI>C,</HI> is left behind, by as much as is the difference of the Gravitations towards the Moon in <HI>C</HI> and <HI>N.</HI> This rightly under&s;tood, it follows plainly that the Sea, which otherwi&s;e would be Spherical, upon the pre&s;&s;ure of the Moon, mu&s;t form it &s;elf into a Spheroidal or Oval figure, who&s;e longe&s;t diameter is where the Moon is Vertical, and &s;hort|e&s;t where &s;he is in the Horizon; and that the Moon &s;hifting her po&s;ition as &s;he turns round the Earth once a day, this Oval of water &s;hifts with her, occa&s;ioning thereby the two floods and ebbs ob&s;ervable in each 25 hours.</P>
<P>And this may &s;uffice as to the general cau&s;e of the Tides; it remains now to &s;hew how naturally this notion accounts for all the particulars that has been ob&s;erved about them; &s;o that there can be no room left to doubt but that this is the true cau&s;e thereof.</P>
<P>The Spring Tides upon the new and full Moons, and Neap Tides on the Quarters are occa&s;ioned by the attractive force of the Sun in the new and full con&s;piring with the attraction of the Moon and producing a Tide by their united forces: whereas in the Quarters the Sun rai&s;es the water where the Moon depre&s;&s;es it, and the contrary; &s;o as the Tides are made only by the diffe|rence of their attractions. That the force of the Sun is no greater in this ca&s;e, proceeds from the very &s;mall proportion the &s;emidi|ameter of the Earth bares to the va&s;t di&s;tance of the Sun.</P>
<P>It is al&s;o ob&s;erved that <HI>caeteris paribus</HI> the Aequinoctial Spring Tides in <HI>March</HI> and <HI>September,</HI> or near them, are the Highe&s;t, and the Neap tides the Lowe&s;t; which proceeds from the greater agitation of the <HI>Waters,</HI> when the fluid <HI>Sphaeroid</HI> revolves about a great Circle of the Earth, than when it turns about in a le&s;&s;er Circle; it being plain that if the Moon were con&s;tituted in the Pole and there &s;tood, that the Spheroid would have a fixt po|&s;ition, and that it would be always high Water under the Poles, and low Water every where under the Aequinoctial: and there|fore the nearer the Moon approaches the Poles, the le&s;s is the
<PB N="8" REF="6">
agitation of the Ocean: which is always greate&s;t where the Moon is in the Aequinoctial, or farthe&s;t di&s;tant from the Poles. Whence the Sun and Moon, being either conjoyned or Oppo&s;ite in the Aequinoctial, produce the greate&s;t Spring Tides; and the &s;ub&s;equent Neap Tides, being produced by the Tropical Moon in the Quarters, are always the lea&s;t Tides; whereas in <HI>June</HI> and <HI>December</HI> the Spring Tides are made by the Tropical Sun and Moon, and therefore le&s;s vigorous; and the Neap Tides by the Aequinoctial Moon, which therefore are the &s;tronger; hence it happens that the difference between the Spring and Neap Tides, in the&s;e Months, is much le&s;s con&s;iderable than in <HI>March</HI> and <HI>Sep|tember.</HI> And the rea&s;on why the very Highe&s;t Spring Tides are found to be rather before the Vernal and after the Autumnal Equinox, <HI>viz.</HI> in <HI>February</HI> and <HI>October,</HI> than preci&s;ely upon them, is becau&s;e the Sun is nearer the Earth in the Winter Months, and &s;o comes to have a greater effect in producing the Tides.</P>
<P>Hitherto we have con&s;idered &s;uch affections of the Tides as are Univer&s;al, without relation to particular ca&s;es; what fol|lows from the differing Latitudes of places, will be ea&s;ily under|&s;tood by the following figure.</P>
<P>Let <HI>A p E P</HI> be the Earth covered over with very deep waters, <HI>C</HI> its Center, <HI>P, p,</HI> its Poles, <HI>A E</HI> the Aequinoctial, <HI>F f</HI> the paral|lel of Latitude of a place, <HI>D d</HI> another Parallel at equal di&s;tance 
<FIGURE>
</FIGURE> 
on the other &s;ide of the Equinoctial; <HI>H, h</HI> the two points where by the attraction of the Moon it is highe&s;t water; <HI>K, k</HI> two places
<PB N="9" REF="6">
90 degree from the former, where it is low Water. The Sphe|roid de&s;cribed upon the diameters <HI>H h,</HI> and <HI>k K,</HI> &s;hall nearly repre&s;ent the figure of the Sea, and <HI>C f, C D, C F, C d</HI> &s;hall be the hights of the Sea in the places <HI>f, D, F, d,</HI> in all which it is High Water: and &s;eeing that in twelve hours time, by the diurnall ro|tation of the Earth, the point <HI>F</HI> is transferred to <HI>f,</HI> and <HI>d</HI> to <HI>D:</HI> the hight of the Sea <HI>C F</HI> will be that of the high water when the Moon is pre&s;ent, and <HI>C f</HI> that of the other high water, when the Moon is under the Earth: which in the ca&s;e of this figure is le&s;s than the former <HI>C F.</HI> And in the oppo&s;ite parallel <HI>D d</HI> the contrary happens. The Ri&s;ing of the Water being alwais alternately greater and le&s;s in each place, when it is produced by the Moon declin|ing &s;en&s;ibly from the Equinoctial; that being the greate&s;t of the two Highwaters, in each diurnall revolution of the Moon, where|in &s;he approaches neare&s;t either to the Zenith or Nadir of the place: whence it is that the Moon in Northern Signs, in this part of the World, makes the greate&s;t Tides when above the Earth, and in Southern Signs, when under the Earth: the Effect being always greate&s;t where the Moon is farthe&s;t from the Horizon, ei|ther above or below it. And this alternate increa&s;e and de|crea&s;e of the Tides has been ob&s;erved to hold true on the Coa&s;t of <HI>England,</HI> at <HI>Bri&s;tol</HI> by Capt. <HI>Sturmy,</HI> and at <HI>Plymouth</HI> by Mr. <HI>Colepre&s;&s;e.</HI></P>
<P>But the motions hitherto mentioned are &s;omewhat altered by the libration of the water, whereby tho' the Action of the <HI>Lu|minaries</HI> &s;hould cea&s;e, the Flux and Reflux of the <HI>Sea</HI> would for &s;ome time continue: This con&s;ervation of the impre&s;&s;ed motion dimini&s;hes the differences that otherwi&s;e would be between two con&s;equent Tides, and is the rea&s;on why the highe&s;t Spring-Tides are not perci&s;ely on the new and full Moons, nor the Neapes on the Quarters; but generally they are the third Tides after them, and &s;ometimes later.</P>
<P><PB N="10" REF="7">All the&s;e things would regularly come to pa&s;s, if the whole Earth were covered with Sea very deep; but by rea&s;on of the &s;holene&s;s of &s;ome places, and the narrowne&s;s of the Streights by which the Tides are in many ca&s;es propagated; there ari&s;es a great diver&s;ity in the effect, and not to be accounted for with|out an exact knowledg of all the circum&s;tances of the places, as of the po&s;ition of the Land, and the breadth and depth of the Channels by which the Tide flows; for a very &s;low and imper|ceptible motion of the whole body of the water, where it is (for example) 2 miles deep, will &s;uffice to rai&s;e its &s;urface 10 or 12 feet in a Tides time; whereas if the &s;ame quantity of water were to be conveied upon a channel of 40 fathoms deep, it would re|quire a very great &s;tream to effect it, in &s;o large Inlets as are the <HI>Channel</HI> of <HI>England</HI> and the <HI>German Ocean;</HI> whence the Tide is found to &s;et &s;tronge&s;t in tho&s;e places where the Sea grows nar|<GAP DESC="illegible" EXTENT="1 letter">owe&s;t; the &s;ame quantity of water being to pa&s;s through a &s;maller pa&s;&s;age: this is mo&s;t evident in the <HI>Streights</HI> between <HI>Portland</HI> and <HI>Cape de Hague</HI> in <HI>Normandy,</HI> where the Tide runs like a &s;luice; and it would be yet more between <HI>Dover</HI> and <HI>Calais,</HI> if the Tide coming about the <HI>I&s;land</HI> from the <HI>North</HI> did not check it. And this force being once impre&s;&s;ed upon the water, con|tinues to carry it about the level of the ordinary hight in the Ocean, particularly where the water meets a direct ob&s;tacle, as it is at St. <HI>Malo's;</HI> and where it enters into a long channell, which run|ning far into the land, grows very &s;treight at its extremity; as it is in the <HI>Severn-Sea</HI> at <HI>Chep&s;tow</HI> and <HI>Bri&s;tol.</HI></P>
<P>This &s;holene&s;s of the Sea and the intercurrent Continents are the rea&s;on that in the open Ocean the time of high water is not at the Moons appul&s;e to the Meridian, but always &s;ome hours after it; as it is ob&s;erved upon all the We&s;t Coa&s;t of <HI>Europe</HI> and <HI>Africa,</HI> from <HI>Ireland</HI> to the <HI>Cape</HI> of <HI>Good-Hope:</HI> in all which a S. W. Moon makes high Water; and the &s;ame is reported to be on the We&s;t &s;ide of <HI>America.</HI> But it would be endle&s;s to accont
<PB N="11" REF="7">
for all tho&s;e particularities, which are con&s;equences of this <HI>Hypo|the&s;is;</HI> as why <HI>Lakes,</HI> &s;uch as the <HI>Ca&s;pian Sea;</HI> and <HI>Mediterrani|an-Seas</HI> &s;uch as the <HI>Black-Sea,</HI> the <HI>Streights</HI> and <HI>Baltick,</HI> have no &s;en&s;ible Tides: For <HI>Lakes</HI> having no communication with the Ocean, can neither encrea&s;e nor dimini&s;h their Water, whereby to ri&s;e and fall; and Seas that communicate by &s;uch narrow Inletts and are of &s;o immen&s;e an extent, cannot in a few hours time re|ceive or empty Water enough to rai&s;e or &s;ink their Surface any thing &s;en&s;ibly.</P>
<P>La&s;tly to demon&s;trate the excellency of this Doctrine, the ex|ample of the Tides in the Port of <HI>Tunking</HI> in <HI>China,</HI> which are &s;o extraordinary and differing from all others wee have yet heard of, may &s;uffice. In this Port there is but one Flood and Ebb in 24 hours; and twice in each Month, <HI>viz.</HI> when the Moon is near the Equinoctial, there is no Tide at all, but the Water is &s;tag|nant; but with the Moons declination there begins a Tide which is greate&s;t when &s;he is in the Tropical Signs: only with this difference, that when the Moon is to the Northward of the Aequinoctial, it flows when &s;he is above the Earth, and Ebbs when &s;he is under, &s;o as to make high Water at Moons &s;etting, and low Water at Moons ri&s;ing: But on the contrary the Moon being to the Southward makes high water at ri&s;ing and low water at &s;etting, it Ebbing all the time &s;he is above the Hori|zon. As may be &s;een more at large in the <HI>Philo&s;ophical Tran&s;|action</HI> Num. 162.</P>
<P>The Cau&s;e of this odd Appearance is propo&s;ed by Mr. <HI>New|ton,</HI> to be from the concurrence of two Tides; the one propa|gated in &s;ix hours out of the great <HI>South-Sea,</HI> along the Coa&s;t of <HI>China;</HI> the other out of the <HI>Indian-Sea,</HI> from between the I&s;lands, in twelve hours, along the Coa&s;t of <HI>Malacca</HI> and <HI>Cambodia.</HI> The one of the&s;e Tides, being produced in North Latitude, is, as has been &s;aid, greater, when the Moon being to the North of the Equator is above the Earth, and le&s;s when &s;he is under the
<PB N="12" REF="8">
Earth; and contrarywi&s;e the other Tide that comes out of the <HI>Indian-Sea,</HI> being rai&s;ed in South Latitude, is greater when the Moon declining to the <HI>South</HI> is above the Earth, and le&s;s when &s;he is under the Earth: &s;o that of the&s;e Tides alternately great|er and le&s;&s;er, there comes alwaies &s;ucce&s;&s;ively two of the great|er and two of the le&s;&s;er together every day; and the high-wa|ter falls alwais between the times of the arrival of the two great|er Floods, and the low-water between the arrival of the two le&s;&s;er Floods. And the Moon coming to the Equinoctial, and the alternate Floods becoming equal, this Tide cea&s;es and the Wa|ter &s;tagnates: but when &s;he has pa&s;&s;ed to the other &s;ide of the E|quator, tho&s;e Floods which in the former order were the lea&s;t, now becoming the greate&s;t, that that before was the time of high water now becomes the low-water, and the conver&s;e. So that the whole appearence of the&s;e &s;trange Tides, is without any for|cing naturally deduced from the&s;e principles, and is a great argu|ment of the certainty of the whole <HI>Theory.</HI></P>
<P>If by rea&s;on of the difficulty of the Matter, there be any thing herein not &s;ufficiently explained, or if there be any material thing ob&s;ervable in the Tides that I have omitted, wherein your Maje&s;|ty &s;hall de&s;ire to be &s;atisfied, I doubt not but if your Maje&s;ty &s;hall plea&s;e to &s;uffer me to be admited to the honour of your <HI>Royal Pre&s;ence,</HI> I may be able to give &s;uch an account thereof as may be to your Maje&s;ties full content.</P>
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