Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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others may not, at leaſt, taken
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collectively
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: now thoſe are pe
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riſhable, but theſe perpetual. </
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>The Earth therefore ſince it
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is reckoned amongſt thoſe things that are permanent, as hath
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been ſaid already, hath its parts, not diſſipable, nor
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ab invicem,
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ſeparable from its Centre (whereby its true and proper place is
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aſſigned it) and from its whole, taken collectively: becauſe ac
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cording to its whole it is always preſerved, compact, united, and
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cohærent in it ſelf, nor can its parts be ſeperated from the Cen
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tre, or from one another, unleſs it may ſo fall out
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per accidens,
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and violently in ſome of its parts; which afterwards, the obſtacle
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being removed, return to their Natural Station ſpontaneouſly,
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and without any impulſe. </
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>In this Senſe therefore the Earth is
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ſaid to be Immoveable, and Immutable: yea even the Sea, Aire,
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Heaven, and any other thing (although otherwiſe moveable) ſo
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long as its parts are not diſſipable and ſeperable, may be ſaid to
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be Immoveable, at leaſt taken
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collectively.
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This Principle
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or Maxim differeth from the precedent only in that this referrs
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to the parts in order to
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Place,
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and this, in order to the Whole.</
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The Earths Cen
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tre keepeth it in
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its Natural Place.
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>From this Speculation another Secret is diſcovered. </
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>For hence
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it is manifeſt wherein the proper and genuine formality of the
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Gravity aad Levity of Bodyes conſiſteth; a point which is not ſo
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clearly held forth, nor ſo undeniably explained by the Peripate
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tick Phyloſophy.
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Gravity
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therefore is nothing elſe according to
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the Principles of this new Opinion, than a certain power and ap
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petite of the Parts to rejoyn with their Whole, and there to reſt
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as in their proper place. </
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>Which Faculty or Diſpoſition is by
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Divine Providence beſtowed not only on the Earth, and Ter
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rene Bodies, but, as is believed, on Cœleſtial Bodies alſo, name
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ly the Sun, Moon, and Starrs; all whoſe parts are by this Impul
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ſion connected, and conſerved together, cleaving cloſely to each
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other, and on all ſides preſſing towards their Centre, until they
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come to reſt there. </
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>From which Concourſe and Compreſſion a
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Sphærical and Orbicular Figure of the Cæleſtial Orbes is produ
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ced, wherein by this occult Quality naturally incident to
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each of them they of themſelves ſubſiſt, and are alwayes preſer
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ved. </
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>But
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Levity
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is the Extruſion and Excluſion of a more te
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nuoſe and thin Body from the Commerce of one more Solid and
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denſe, that is Heterogeneal to it, by vertue of Heat. </
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>Where
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upon, as the Motion of Grave Bodies is
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Compreſſive,
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ſo the Mo
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tion of Light Bodies is
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Extenſive:
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For its the propperty of Heat
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to dilate and rarify thoſe things to which it doth apply, conjoine
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and communicate it ſelf. </
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>And for this reaſon we find Levity
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and Gravity not only in reſpect of this our Tereſtrial Globe, and
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the Bodies adjacent to it, but alſo in reſpect of thoſe Bodies
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which are ſaid to be in the Heavens, in which thoſe parts which </
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