Descartes, René
,
Renati Des-Cartes principia philosophiae
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bus intercepti, contactum immediatum impediunt. </
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>Si
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autem corpus G hinc inde moveatur ſupra corpus H,
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ſecundùm lineam rectam EF, nihil impediet quomi
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nus immediatè ipſum tangat: ſaltem ſi utriuſque
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ſuperficies ſint laeves & planèae; ſi autem ſint rudes &
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inaequales, paullatim hoc ipſo motu laevigantur &
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explanèantur. </
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>Itaque putandum eſt, calcis & cinerum
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particulas ab invicem disjunctas, hîc exhiberi per
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corpora B & C; particulas autem vitri ſimul junctas,
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per corpora G & H. </
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quam perſpicuum eſt in illas, per vehementem & diu
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turnam ignis actionem, debere induci, omnes vitri
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proprietates acquirunt. </
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CXXV.
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Quòmodo ejus particu
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lae ſimul jungantur. </
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Vitrum enim, cùm adhuc candet, liquidum eſt, quia
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ejus particulae facilè moventur illâ ignis vi, quâ jam
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antè fuerunt laevigatae atque inflexze. </
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>Cùm verò inci
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pit refrigerari, quaſlibet figuras poteſt induere. </
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>Hoc
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que omnibus corporibus igne liquefactis eſt com
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mune; dum enim adhuc liquida ſunt, ipſorum parti
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culae non aegrè ſe accommodant ad quaſlibet figuras,
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&scùm poſtea frigore concreſcunt, eaſdem retinent,
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quas ultimò induerunt. </
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<
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>Poteſt etiam in fila capillo
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rum inſtar tenuia extendi, quia ejus particulae, jam
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concreſcere incipientes, faciliùs unae ſupra alias fluunt
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quàm ab invicem disjungantur. </
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