Descartes, René
,
Renati Des-Cartes principia philosophiae
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LXXXV.
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Quomodo ex lignis
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ſiccis. </
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Accenditur etiam ignis ope ſpeculi concavi, vel
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vitri convexi, multos Solis radios verſus eundem ali
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quem locum dirigentis. </
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rum actio globulos ſecundi elementi pro ſubjecto ſuo
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habeat, multò tamen concitatior eſt ordinario eorum
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motu, & cùm procedat à materià primi elementi, ex
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quà Sol eſt conflatus, ſatis habet celeritatis ad ignem
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excitandum, radiique tam multi ſimul colligi poſſunt,
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ut ſatis etiam habeant virium, ad particulas corporum
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terreſtrium eâdem iſtâ celeritate agitandas. </
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LXXXVI.
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Quomodo ex collectio
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ne radiorum Solis. </
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Quippe nihil refert, à quâ cauſſâ particulae terreſtres
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celerrimè moveri primùm incipiant. </
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fuerint ſine motu, ſi tantùm innatent materiae primi
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elementi, ex hoc ſolo protinus celerrimam agitatio
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nem acquirunt: eàdem ratione quânavis, nullis fni
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bus alligata, in aquâtorrente eſſe non poteſt, quin
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ſimul cum ipſâſeratur. </
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cula nondum primo elemento ſic innatent,ſi tantùm
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à quâlibet alià cauſà ſatis celeriter agitentur, hoc ipſo
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ſe mutuò, & globulos ſecundi elementi circa ſe poſitos,
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ita excutient, ut ſttim ei innatare incipiant; & porrò
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ab illo in motu ſuo conſervabuntur. </
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nis motus valde concitatus ſuſſicit ad ignem excitan
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dum. </
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cùm ſcilicenubes excelſa, in aliam humiliorem ruens,
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ae
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rem interceptum explodit, ut in Meteoris explicui a. </
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LXXXVII.
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Quomodo à ſolo motu
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valde violento. </
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Quanquam ſanèvix unquam iſte ſolus motus ibi eſt
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ignis cauſſa; nam ferèſemper ae
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ri admiſcentur exha
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lationes, quarum talis eſt natura, ut facilè vel in flam
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mam, vel ſaltem in corpus lucidum vertantur. </
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<
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