Descartes, René, Renati Des-Cartes principia philosophiae
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              tur, non ſemper eundem ſitum ſervant, nec ideò par­
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              ticulas ſtriatas rectà pergentes, niſi admodum diffi­
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              culter, admittunt. </s>
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              CXIII.
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              In omnibus maculis
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              multos meatus à par­
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              ticulis ſtriatis exca­
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              vari. </s>
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              20</s>
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              25</s>
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              30</s>
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              Sed facil` fieri poteſt, ut eadem ſtella fixa per vices
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              appareat & diſpareat, ſinguliſque vicibus
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              diſ­
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              parebit, novo cortice* macularum involvatur. </s>
              <s>Talis
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              enim alternatio eſt naturae valde familiaris, in corpo­
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              ribus quae moventur: ita ſcilicet ut, cùm ab aliquâ
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              cauſâ verſùs certum terminum impulſa ſunt, non in
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              eo ſubſiſtant, ſed ulteriùs pergant, donec rurſus
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              aliâ cauſà verſùs ipſum repellantur. </s>
              <s>Ita, dum pondus
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              funi appenſum, vi gravitatis ab uno latere ad perpen­
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              diculum ſuum deſcendit, impetum acquirit, à quo
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              ultra iſtud perpendiculum in oppoſitum latus fertur,
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              donec rurſus gravitas, iſto impetu ſuperato,
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              ver­
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              ſùs perpendiculum moveat, & inde novus in eo im­
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              petus oriatur. </s>
              <s>Ita, vaſe ſemel moto, liquor in eo con­
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              tentus multoties it & redit, antequam ad quietem
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              reducatur. </s>
              <s>Et ita, cùm omnes coelorum vortices in
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              quodam aequilibrio conſiſtant, ubi unius
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              ſe­
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              mel ab iſto aequilibrio receſſit, poteſt multoties nunc
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              in unam nunc in adverſam partem excurrere, ante­
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              quam ab iſto motu quieſcat. </s>
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              CXIV.
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              Eandem ſtellam poſſe
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              per vices apparere ac
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              diſparere. </s>
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              5</s>
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              10</s>
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              15</s>
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              20</s>
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              Fieri etiam poteſt ut totus vortex, in quo talis ali­
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              qua ſtella fixa continetur, ab aliis
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              vorticibus abſorbeatur, & ejus ſtella, in aliquem ex
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              iſtis vorticibus abrepta, mutetur in Planetam vel Co­
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              metam. </s>
              <s>Nempe duas tantùm cauſas ſuprà invenimus a, </s>
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