Descartes, René
,
Renati Des-Cartes principia philosophiae
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XXI.
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Omnes Terrae parts,
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ſi ſolae ſpectentur, non
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eſſe graves, ſed leves. </
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Cùm autem nullum ſit tale vacuum, nec Terra pro
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prio motu cieatur a, ſed à materiâ coeleſti, eam am
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biente, omneſque ejus poros pervadente, deferatur,
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ipſa habet rationem corporis quieſcentis; materia au
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tem coeleſtis, quatenus tota conſentit in illum motum
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quo Terram deſert, nullam habet vim gravitatis, nec
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levitatis; ſed quatenus ejus partes plus habent agita
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tionis quàm in hoc impendant, ideoque ſemper tectas
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occurſu à motibus ſuis ſecundùm lineas rerrae
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quendis impediuntur, ſemper ab eâ quantum poſſunt
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recedunt, & in hoc earum levitas conſiſtit. </
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XXII.
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In quo conſiſtat levitas
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materiae coeleſtis. </
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Notandum deinde, vim quam habent ſingulae partes
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materiae coeleſtis ad recedendum à Terrâ, ſuum effe
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ctum fortèiri non poſſent, niſl, dum ille aſcendunt, ali
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quas partes terreſtres in quarum locum ſuccedunt,
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infra ſe deprimant & propellant. </
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>Cùm enim omnia
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ſpatia quae ſunt circa Terram, vel à particulis corpo
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rum terreſtrium, vel à materiâ coeleſti occupentur;
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atque omnes globuli hujus materiae cceleſtis aequalem
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habeant propenſionem ad ſe ab eâ removendos, nul
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lam ſinguli habent vim, ad alios ſui ſimiles loco pel
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lendos. </
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>Sed cùm talis propenſio non ſit tanta b in par
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ticulis corporum terreſtrium, quoties aliquas ex ipſis
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ſupra ſe habent, omnino in eas vim iſtam ſuam de
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bent exercere. </
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<
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>Atque ita gravitas cujuſque corporis
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terreſtris non propriè efficitur ab omni materiâ coeleſti
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illud circumfluente, ſed praecisè tantùm ab eâ ipſius
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parte, quae, ſi corpus iſtud deſcendat, in ejus locum
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immediat aſcendit, ac proinde quae eſt illi </
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