Descartes, René
,
Renati Des-Cartes principia philosophiae
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tur. </
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>Quod idem in omnibus terrae particulis, ad quas
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Solis radii pertingunt, habet locum; & ideò omnes a
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Solis lumine agitantur. </
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XXVIII.
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De tertiâ actione, quae
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eſt lumen; quomodo
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particulas ae
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ris com
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moveat. </
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Haec autem particularum terreſtrium agitatio, ſive
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orta ſit à lumine, ſive ab aliâ quâvis cauſſâ,
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vo
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catur; praeſertim cùm eſt major ſolito & movet ſen
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ſum; caloris enim denominatio ad ſenſum tactùs re
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fertur. </
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<
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>Notandumque eſt unamquamque ex particulis
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terreſtribus ſic agitatam, perſeverare poſtea in ſuo
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motu juxta leges naturae a, donec ab aliquà alià
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ſiſtatur; atque ideò calorem à lumine ortum, ſemper
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aliquamdiu poſt ſublatum lumen remanere. </
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XXIX.
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De quartâ, quae eſt ca
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lor; quid ſit, & quo
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modo ſublato lumine
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perſeveret. </
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Notandum praeterea particulas terreſtres, à radiis
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Solis ſic impulſas, alias ſibi vicinas, ad quas iſti radii
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non perveniunt, agitare; haſque rurſus alias, &
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conſequenter. </
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<
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>Cùmque ſemper tota Terrae medietas à
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Sole illuſtretur, tot ejuſmodi particulas ſimul commo
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veri, ut quamvis lumen in primâ opacâ` ſuperficie ſub
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ſiſtat, calor tamen ab eo genitus uſque ad intimas
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partes mediea Terrae regionis debeat pervenire.
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XXX.
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Cur altiùs penetret,
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quàm lumen. </
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Notandum denique iſtas particulas terreſtres, cùm
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à ealore plus ſolito agitantur, in tam anguſto ſpatio
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vulgò non poſſe contineri, quàm cùm quieſcunt vel
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minùs moventur quia figuras habent irregulares, quae
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minùs loci occupant, cùm certo aliquo modo junctae
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25
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quieſcunt, quàm cùm aſſiduo motu disjunguntur. </
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<
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>Unde
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ſit, ut calor omnia fere corpora terreſtria rarefaciat,
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ſed una magis, alia minùs, pro vario ſitu & figurâ par
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ticularum, ex quibus conſtant. </
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XXXI.
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Cur corpora ferè om
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nia rarefaciat. </
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His variis adionibus animadverſis, ſi
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