Descartes, René
,
Renati Des-Cartes principia philosophiae
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CXXVI.
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Cur ſit liquidum cùm
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candet, omneſque fi
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guras facilè induat. </
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15</
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20</
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25</
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Cùm deinde vitrum planèè refriguit, eſt valde du
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rum, ſed ſimul etiam valde fragile, atque eò frigilius
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quò citiùs refriguit. </
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>Nempe duritiei cauſſa eſt, quòd
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conſtet tantùm particulis ſatis craſſis &, inflexilibus,
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quae non ramulorum intextu, ſed immediato
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ſibi invicem adhaerent. </
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ideò mollia ſunt, quòd eorum particulae ſint flexiles
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vel certè deſinant in ramulos quoſdam flexiles, qui
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ſibi mutuò annexi eas jungunt. </
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<
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>Nulla autem duorum
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corporum firmior adhaſio eſte poteſt, quàm ea quae
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oritur ex ipſorum immediato contactu; cùm ſcilicet
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ita ſe invicem tangunt, ut neutrum ſit in motu ad ſe ab
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alio ſejungendum; quòd accidit vitri particulis, ſtatim
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atque ab igne remotae ſunt: quia earum craſſities, &
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contiguitas, & figurae inaequalitas impediunt,
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poſ
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ſint ab ae
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re circumjacente in eo motu, quo ab invicem
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disjungebantur, conſervari. </
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CXXVII.
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Cur, cùm frigidum eſt,
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fit valde durum. </
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15</
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At nihilominus vitrum eſt valde fragile, quia ſuper
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ficies ſecundùm quas ejus particulae ſe invicem tan
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gunt, ſunt admodum exiguae ac paucae. </
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<
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>Multaque
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corpora molliora diſſiciliùs franguntur, quia eorum
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partes ita ſunt intertextae, ut ſeparari non poſſint, quin
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ipſarum multi ramuli rumpantur & evellantur. </
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CXXVIII.
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Cur valde fragile. </
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20</
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Eſt etiam fragilius cùm celeriter, quàm cùm lentè,
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refriguit; ejus enim meatus ſunt ſatis laxi dum candet,
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quia tunc multa materia primi elementi, ſimul cum
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globulis ſecundi, ac etiam fortè cum nonnullis ex
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tenuioribus tertii particulis, per illos tranſit. </
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<
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>Cùm au
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tem refrigeratur ſponte, redduntur anguſtiores; quia
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ſoli globuli ſecundi elementi, per ipſos tranſeuntes,
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minùs ſpatii requirunt; atque ſi refrigeratio nimis </
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