Descartes, René, Renati Des-Cartes principia philosophiae

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              hinc ignes fatui circa Terram, & fulgetrae in nubibus,
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              &sſtellae trajicientes & cadentes in alto ae
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              re excitantur. </s>
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              Quippe jam dictum eſt a exhalationes conſtare particu­
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              lis tenuiſſimis, & in multos quaſi ramulos diviſis, qui­
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              bus involutae ſunt aliae paullà craſſiores, ex
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              acri­
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              bus aut ſalibus volatilibus eductae. </s>
              <s>Notandumque eſt
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              hos ramulos ſolere eſſe tam minutos & confertos, ut
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              nihil per illorum interſtitia, praeter materiam primi
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              elementi tranſire poſſit; inter particulas autem iſtis
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              ramulis veſtitas, eſſe quidem alia majora intervalla,
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              quae globulis ſecundi elementi ſolent impleri, tuncque
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              exhalatio non igneſcit; ſed interdum etiam accidere,
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              ut occupentur à particulis alterius exhalationis aut
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              ſpiritûs, quae inde ſecundum elementum expellentes,
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              primo duntaxat locum relinquunt, ejuſque
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              pro­
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              tinus abreptae flammam componunt. </s>
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              LXXXVIII.
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              Quomodo à diverſorum
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              corporum miſturâ.</s>
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              30</s>
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              5</s>
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              10</s>
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              15</s>
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              Et quidem in fulmine, vel fulgetris, cauſſa quae
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              plures exhalationes ſimul compingit, manifeſta eſt,
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              propter unius nubis in aliam lapſum. </s>
              <s>In ae
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              re autem
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              tranquillo, unâ exhalatione frigore denſatâ &
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              quie­
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              ſcente, facilè alia, ex loco calidiore adveniens, aut
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              particulis ad motum aptioribus conſtans, aut etiam
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              aliquo leni vento impulſa, in ejus poros impetum facit,
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              atque ex iis ſecundum elementum expellit; cùmque
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              particulae prioris exhalationis nondum tam arctè
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              junctae ſunt, quin hoc aliarum impetu disjungi poſſint,
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              hoc ipſo in flammam erumpunt: quâ ratione ſtellas
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              trajicientes accendi puto. </s>
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              LXXXIX.
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              In fulmine, in ſtellis
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              trajicientibus. </s>
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              20</s>
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              25</s>
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              Cùm autem exhalationis particulae in corpus tam
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              craſſum & viſcidum coaluerunt, ut non
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              </s>
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