Descartes, René, Renati Des-Cartes principia philosophiae

Page concordance

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            <pb pagenum="253"/>
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              LXXXV.
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              Quomodo ex lignis
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              ſiccis. </s>
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              20</s>
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              25</s>
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              30</s>
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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. </s>
              <s>Quamvis enim iſtorum radio­
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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. </s>
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            <p type="margin">
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              LXXXVI.
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              Quomodo ex collectio­
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              ne radiorum Solis. </s>
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              5</s>
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              10</s>
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              Quippe nihil refert, à quâ cauſſâ particulae terreſtres
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              celerrimè moveri primùm incipiant. </s>
              <s>Sed quamvis antea
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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. </s>
              <s>Et quamvis ea terreſtres parti­
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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. </s>
              <s>Quamobrem om­
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              nis motus valde concitatus ſuſſicit ad ignem excitan­
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              dum. </s>
              <s>Et talis in ſulmine ac turbinibus ſolet reperiri,
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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. </s>
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            <p type="margin">
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              LXXXVII.
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              Quomodo à ſolo motu
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              valde violento. </s>
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              15</s>
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              20</s>
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              25</s>
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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. </s>
              <s>Atque </s>
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