Descartes, René, Renati Des-Cartes principia philosophiae

Table of figures

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            <pb pagenum="269"/>
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              CXX.
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              De aquis ardentibus,
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              inſipidis, acidis. </s>
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              20</s>
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              25</s>
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              30</s>
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              Quaedam etiam particulae craſſiores, quales ſunt
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              eae argenti vivi, & ſalium, quae, vaſorum ſummitati
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              adhaerentes, in corpora dura concreſcunt, ſatis magnâ
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              vi opus habent, ut in ſublime attollantur. </s>
              <s>Sed olea
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              omnium diſſicillime ex duris & ſiccis corporibus ex­
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              halantur; idque non tam ignis vi, quàm arte quâdam
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              perſici debet. </s>
              <s>Cùm enim eorum particul¬àe tenues ſint
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              &sramoſae, magna vis eas frangeret atque diſcerperet,
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              priuſquam ex iſtorum corporum meatibus educi poſ­
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              ſent. </s>
              <s>Sed iis affunditur aqua copioſa, cujus particulae
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              laeves & lubricae, meatus iſtos pervadentes, paullatim
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              illas integras eliciunt ac ſecum abripiunt. </s>
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            <p type="margin">
              <s>
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              CXXI.
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              De ſublimatis & oleis. </s>
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              5</s>
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              10</s>
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              Atque in his omnibus ignis gradus eſt obſervandus:
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              eo enim variato, ſemper aliquo modo effectus varia­
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              tur. </s>
              <s>Ita multa corpora, lento primùm igni, ac deinde
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              gradatim fortiori, admota, ſiccantur, & varias parti­
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              culas exhalant: quales non emitterent, ſed potiùs
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              tota liqueſcerent, ſi ab initio validis ignibus torque­
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              rentur. </s>
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              <s>
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              CXXII.
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              Quòd mutato ignis
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              gradu mutetur ejus
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              effectus. </s>
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              15</s>
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              Modus etiam ignem applicandi, variat ejus effectum. </s>
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              Sic quaedam, ſi tota ſimul incaleſcant, liquefiunt; ſed
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              ſi valida flamma ipſorum ſuperficiem lambat, illam in
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              calcem convertit. </s>
              <s>Quippe corpora omnia dura, quae
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              ſolâ ignis actione in pulverem minutiſſimum reducun­
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              tur, fractis ſcilicet vel expulſis tenuioribus quibuſdam
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              eorum particulis, quae reliquas ſimul jungebant, vulgò
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              apud Chymicos dicuntur in calcem verti. </s>
              <s>Nec alia in­
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              ter cineres & calcem differentia eſt, quàm quòd cine­
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              res ſint reliquiae eorum corporum, quorum magna
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              pars igne conſumta eſt, calx verò ſit eorum, quae ferè
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              tota poſt abſolutam uſtionem manent. </s>
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