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

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            <p type="main">
              <s id="s.000442">
                <pb pagenum="92" xlink:href="010/01/100.jpg"/>
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              ſus tùm pilæ, tùm fune-penduli, niſi quia grauitas pi­
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              læ contrario niſu vim impetus aſcendentis deſtruit. </s>
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            <p type="margin">
              <s id="s.000443">
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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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              <s id="s.000444">Sed quid tandem hinc aduerſarius deducere vel­
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              let? </s>
              <s id="s.000445">an quia ex eo, quòd natura grauitatis diuerſą
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              ſit ab impetu dicemus impetum prædictæ pilæ de­
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              ſcendentis vſque ad centrum, vel perpendiculum ge­
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              nitum non fuiſſe à vi, & exercitio grauitatis? </s>
              <s id="s.000446">à quą
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              nam ergo virtute tamquam à principio immediato
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              genitus fuit? </s>
              <s id="s.000447">profectò ſi ſenſus negare non velimus,
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              fatendum eſt à nulla alia cauſa, vel principio exter­
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              no, ſed tantummodò ab ipſamet grauitate pilæ de­
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              ſcendentis impetum prædictum genitum fuiſſe, nec
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              certitudo ſenſus relinqui debet propter difficulta­
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              tem adductam ab aduerſario, vt præclarè Ariſtoteles
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              præcipit. </s>
              <s id="s.000448">Si igitur grauitas pilæ eſt ſaltem
                <expan abbr="principiũ">principium</expan>
              ,
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              & cauſa mediata conſequentis aſcenſus, neceſſariò
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              actus, & operatio aſcenſus, quæ violenta, & præter
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              naturam ſaxi exiſtimatur, efficietur procreabiturque
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              ab interno, & naturali principio grauitatis eius, &
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              proindè actus aſcenſus, ſeu motus violentus efficie­
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              tur à principio interno, & naturali. </s>
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            <p type="margin">
              <s id="s.000449">
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              5. phyſ c. 3.</s>
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            <p type="main">
              <s id="s.000450">Et hìc obitèr mirari licèt horum philoſophorum̨
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              ſecuritatem; hìc negant impetum à grauitate pro­
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              creari, & inculcant valdè inter ſe differre, & ſe mu­
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              tuò deſtruere, & vnà
                <expan abbr="cũ">cum</expan>
              Ariſtotele in mechanicis a­
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              pertè fatentur impetum eſſe grauitatem fluentem eſ­
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              ſeque prorſus eiuſdem naturæ, quia nimirum ſaxum
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              impetu affectum comprimit, conterit aduerſa cor­
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              pora eodem modo, ac ingens pondus efficit. </s>
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          </chap>
        </body>
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