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.</
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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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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<
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">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. </
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">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. </
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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. </
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ſecùs ac in libra preſſa ab in æqualibus ponderibus, </
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