Descartes, René
,
Renati Des-Cartes principia philosophiae
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porum terreſtrium particulis, quibus alatur & renove
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tur, eſſe non poteſt. </
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LXXX.
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De naturâ ignis, ejuſ
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que ab ae
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re diverſi
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tate. </
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Cùm enim globuli ſecundi elementi occupent omnia
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intervalla circa Terram, quae ſatis magna ſunt ad illos
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capiendos, & ſibi mutuò omnes ita incumbant, ut
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abſque aliis moveri non poſſint (niſi fortè circulariter
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circa proprium axem), quamvis materia primi elemen
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ti, omnes exiguos angulos à globulis iſtis relictos re
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plens, in ipſis quam-celerrimè moveatur, ſi tamen non
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habeat plus ſpatii, quàm quòd in iſtis
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contine
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tur, non poteſt ibi habere ſatis virium ad particulas
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terreſtres, quae omnes à ſe mutuò &, à globulis ſecundi
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elementi ſuſtinentur, ſecum rapiendas, nec proinde ad
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ignem generandum. </
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>Sed ut ignis alicubi primùm exci
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tetur, debent aliquâ vi expelli globuli coeleſtes,
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in
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tervallis nonnullarum particularum terreſtrium, quae
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deinde ab invicem disjunct, atque in ſolâ materiâ
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primi elementi natantes, celerrimo ejus motu rapian
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tur & quaquaverſus impellantur. </
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LXXXI.
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Quomondo primùm
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excitetur. </
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Utque ille ignis conſervetur, debent iſtae
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terreſſtres eſſe ſatis craſſae, ſolidae, atque ad motum
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aptae, ut à materiâ primi elementi ſic impulſae, vim ha
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beant globulos coeleſtes, à loco illo in quo eſt ignis,
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&sin quem redire parati ſunt, repellendi; atque ita
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impediendi ne globuli iſti rurſus ibi
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inter
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valla primo elemento relicta, ſicque vires ejus fran
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gendo ignem exſtinguant. </
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LXXXII.
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Quomodo conſervetur. </
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Ac praeterea particulae terreſtres, in globulos iſtos
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impingentes, non poſſunt ab iis impediri, ne ulteriùs
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pergant, & egrediendo ex eo loco in quo
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ele
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mentum ſuas vires exercet, ignis formam amittant, </
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