Descartes, René
,
Renati Des-Cartes principia philosophiae
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CXXIII.
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De Calce. </
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Ultimus ignis effectus, eſt calicis & cinerum in vi
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trum converſio. </
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>Poſtquam enim ex corporibus, quae
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uruntur, tenuiores omnes particulae evulſae ac rejectae
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ſunt, caeterae, quae pro calce vel cineribus manent,
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tam ſolidae ſunt & craſſae, ut ignis vi ſurſum
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non poſſint; figuraſque habent 'ut, plurimùm irregu
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lares & anguloſas: unde fit ut unae aliis incumbentes
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ſibi mutuònon adhaereant, nec etiam, niſi fortè in mi
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nutiſſimis quibuſdam punctis, ſe contingant. </
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tem poſtea validus & diuturnus ignis pergit in
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vim ſuam exercere, hoc eſt, cùm tenuiores particulae
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tertii elementi, unà cum globulis ſecundi à materiâ
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primi abreptae, celerrimè circa ipſas in omnes partes
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moveri pergunt, paullatim earum anguli atteruntur,
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&sſuperficies laevigantur, & fortè etiam nonnullae
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ipſis inflectuntur, ſicque unae ſuper alias repentes &
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fluentes, non punctis duntaxat, ſed exiguis quibuſdam
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ſuperficiebus ſe contingunt, & hoc pacto ſimul con
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nexae vitrum componunt. </
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CXXIV.
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De vitro, quomodo fiat. </
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Quippe notandum eſt, cùm duo corpora,
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ſuperficies aliquam latitudinem habent, ſibi mutuò
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ſecundùm lineam rectam occurrunt, ipſa non poſſe
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tam propè ad invicem accedere, quin ſpatium aliquòd
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intercedat, quòd à globulis ſecundi elementi occupe
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tur; cùm autem unum ſupra aliud obliquè ducitur
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vel repit, ea multo arctius jungi poſſe. </
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cauſâ, ſi corpora B & C ſibi invicem occurrant ſecun
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dùm lineam AD, globuli coeleſtes eorum </
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