Descartes, René, Renati Des-Cartes principia philosophiae

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="184"/>
              gantur in ſuperficie convexâ materize vorticis AEIO,
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              quae Cometam adhuc involvit, & refractio illa ipſos
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              removeat à perpendiculari, juxta ea quae in Dioptricâ
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              explicui a: quia nempe radii iſti multò difficiliùs tran­
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              ſeunt per hanc materiam vorticis AEIO, quàm
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              illam vorticis AEVX: unde ſit, ut longè pauciores
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              perveniant ad Cometam, quàm ſi refractio iſta non
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              fieret; hique pauciores, inde ad oculum reflexi, poſ­
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              ſunt eſſe nimis debiles ad eum movendum. </s>
              <s>Alia verò
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              ratio eſt, quòd valde ſit credibile,
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              ea­
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              dem ſemper Lunae facies terram reſpicit, ita ſemper
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              eandem cujuſque Cometae partem verſùs centrum vor­
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              ticis in quo verſatur, converti, eamque ſolam radiis
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              reflectendis aptam eſſe. </s>
              <s>Sic nempe, cùm Cometa eſt
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              in 2, illa ejus pars quae radios poteſt
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              oppo­
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              ſita eſt centro S, nec ideò videri poteſt ab iis qui ſunt
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              juxta F ſed progrediendo à 2 ad 3, invertit ſe brevi
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              tempore verſùs F, atque ideò ibi tunc incipit videri. </s>
              <s>
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              Nam rationi valde conſentaneum eſt, primò, ut pute­
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              mus, dum Cometa tranſit ab N per C verſus 2,
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              ejus partem quae ſideri S obverſa eſt, magis agitari &,
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              rarefieri propter actionem iſtius ſideris, quàm aliam
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              partem ab eo averſam. </s>
              <s>Secundò, ut putemus agita­
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              tione iſtâ, tenuiores & (ut ita loquar) molliores par­
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              ticulas tertii elementi, quae ſunt in ejus ſuperficie,
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              eâ ſeparari: unde ſit ut radiis reflectendis aptior eva­
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              dat, quàm ſuperficies alterius partis. </s>
              <s>Quemadmodum
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              ex iis quae de igne infrà dicuntur b, poterit intelligi, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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