Descartes, René, Renati Des-Cartes principia philosophiae

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              etiam ad eoſdem interea modis aliis quamplurimis
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              agendos. </s>
              <s>Et quia, in quamcunque partem ita moveri
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              coeperint, pergunt poſtea quantum poſſunt, ſecundùm
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              lineas rectas, vel à rectis quam-minimùm deflectentes:
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              hinc ſit ut hi globuli coeleſtes, particulis tertii elementi,
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              corpora omnia tertiae Terrae regionis componentibus,
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              immifti, varios in iis effectus producant, quorum tres
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              praecipuos hîc notabo. </s>
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              XV.
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              De actionibus, quarum
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              ope iſta corpora ge­
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              nita ſunt; ac primò
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              de generali globulo­
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              rum coeleſstium motu. </s>
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              25</s>
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              30</s>
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              5</s>
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              Primus eſt, quòd pellucida reddant ea omnia cor­
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              pora terreſtria quae liquida ſunt, & conſtant particulis
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              tertii elementi tam tenuibus, ut globuli iſti circa ipſas
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              in omnes partes ferantur. </s>
              <s>Cùm enim per iſtorum
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              corporum meatus hinc inde aſſidù moveantur, vimque
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              habeant eorum particulas ſitu mutandi, facilè ſibi vias
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              rectas, ſive rectis aequipollentes, & proinde transferen­
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              dae actioni luminis idoneas, in illis efformant. </s>
              <s>Sicque
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              omnino experimur, nullum eſſe in Terrâ liquorem pu­
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              rum, & tenuibus particulis conſtantem, qui non ſit pel­
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              lucidus. </s>
              <s>Quantum enim ad argentum vivum, craſſiores
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              ſunt ejus particulae, quàm ut globulos ſecundi elementi
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              ubique circa ſe admittant; quantum verò ad atramen­
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              tum, lac, ſanguinem, & talia, non ſunt liquores puri,
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              ſed plurimis pulviſculis durorum corporum inſperſi. </s>
              <s>Et
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              quantum ad corpora dura, obſervari poteſt ea omnia
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              eſſe pellucida, quae dum formabantur & adhuc liquida
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              erant, pellucida fuerunt, quorumque partes retinent
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              eundem ſitum, in quo poſitze ſunt à globulis materiae
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              coeleſtis, dum circa ipſas nondum ſibi mutuò adhaerentes
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              movebantur. </s>
              <s>Contrà verò illa omnia eſſe opaca, quo­
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              rum particulae ſimul junctae & connexae ſunt à vi aliquâ
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              externâ, motui globulorum coeleſtium ipſis immiſtorum </s>
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