Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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              Cap. 4. poſi­
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              tiuam leui­
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              tatem noņ
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              dari.</s>
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              Cap. 4. poſi­
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              tiuam leui­
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              tatem noņ
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              dari.</s>
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              PROP. XXXIX.
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              Violentia, qua lignum, & aer per aquam aſcendit, dicitur
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              naturalis, quia eſt neceſſaria.
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              <s id="s.000418">ET hæc quidem dicta ſunt iuxtà vulgarem Peri­
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              pateticam ſententiam, ſed quiſquis hoc nego­
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              tium attentè perpenderit, is planè percipiet, quòd
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              vox violentiæ trahit originem metaphoricè ab illo
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              ſenſu diſplìcentiæ doloris, & amaritudinis, quam
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              patiuntur animantia, dum alterantur, & corrum­
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              puntur. </s>
              <s id="s.000419">Hinc ſequitur, quòd vbi deficit ſenſus, defi­
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              ciat quoque dolor, & violentia neceſsè eſt, & proin­
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              dè alia regula, & norma certiori, ac tutiori diſtingui
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              deberent operationes naturales à non naturalibus,
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              ſeù violentis, eſtque huiuſmodi: operationes omnes
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              quæ abſolutè, & omninò neceſſariæ ſunt, neque vllo
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              pacto fieri poteſt, vt Natura eas negligat, ſed cogi­
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              tur neceſſariò eas exercere, iure naturales operatio­
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              nes appellari, ac cenſeri debent. </s>
              <s id="s.000420">Modò quia ope­
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              ratio naturalis, qua corpora grauiora profundiùs
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              deſcendunt, atque centro terræ propinquiora fiunt,
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              quàm minùs grauia neceſſariò ſecum inuoluit ordi­
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              natam diſpoſitionem corporum, vt nimirùm grauio­
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              ra infimum locum poſſideant; minùs grauia verò ſu­
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              premum, & inſuper vniuerſa huiuſmodi recta diſpo­
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              ſitio exigit vt ambo corpora moueantur tendendo
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              deorsùm in centro communi grauitatis eorum. </s>
              <s id="s.000421">Non
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              ſecùs ac in libra preſſa ab in æqualibus ponderibus, </s>
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