Descartes, René
,
Renati Des-Cartes principia philosophiae
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tiùs in eo permanſit; jamque, ut ita loquar, excoda
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eſt & defaecata, ſummâ vi ſemper gyrans, partim eas
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quae jam factae ſunt abradit, dum interim aliâ in parte
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novae generantur ex novâ materiâ Solem ingrediente:
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unde ſit ut non omnes in iiſdem locis appareant. </
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>Et
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ſanè tota Solis ſuperficies, partibus circumpolaribus
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exceptis, materiâ ex qua componuntur tegi ſolet. </
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qui maculae tantùm eſſe dicuntur, ubi materia illa eſt
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tam denſa & ſtipata, ut vim luminis à Sole venientis
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notabiliter obtundat. </
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XCVI.
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Quomodo iſtae maculae
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diſſolvantur, ac novae
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generentur. </
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Praeterea poteſt contingere, ut macul iſtae, cùm
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ſunt paulò craſſiores & denſiores, priùs in ſuà circum
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ferentiâ quàm in medio atterantur à puriore materiâ
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Solis eas circumfluente; ſicque ut extremitates earum
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circumferentiae, in acutum deſinentes, ejus lumini per
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viae ſint: unde ſequitur ipſas ibi Iridis coloribus pingi
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debere, ut antehac de priſrnate vitreo in Meteoris,
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cap. 8 a, explilcui. </
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>Et tales aliquando colores in illis
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obſervantur. </
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XCVII.
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Cur in quarundam ex
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tremitate colores iri
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dis appareant. </
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Saape etiam contingit, ut materia Solis, circa ma
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culas iſtas fluendo, ſupra ipſarum extremitates aſſur
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gat; tuncque, inter illas & coeli vicini ſuperficiem in
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tercepta, cogitur ad motum ſolito celeriorem: eodem
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modo quo fluminum rapiditas ſemper eſt major in
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locis vadoſis & anguſtis, quàm in latis & profundis. </
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Unde ſequitur Solis lumen ibi aliquantò fortè ius eſſe
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debere. </
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>Atque ita maculae in ſaculas converti ſolent,
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hoc eſt, quaedam ſolaris ſuperficiei partes, quae priùs
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aliis erant obſcuriores, poſtea fiunt lucidiores. </
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vice verſâ faculae in maculas mutari videntur, cùm, his </
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