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

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            <p type="main">
              <s id="s.000596">
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              ergò duos impetus ad inuicem contrarios, nempè
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              leuitatis aeris F grad. 3. & grauitatis gra. </s>
              <s id="s.000597">3. aquæ
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              circumfuſæ D, & hæ duæ virtutes motiuæ ſimùl ſum­
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              ptæ gr.6. component menſuram conatus, & impetus,
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              quo lignum F per aquam aſcendit, hoc tamen eſt fal­
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              ſum, & contra conceſſionem eiuſdem aduerſarij, &
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              contra demonſtrationem Archimedis, & tandem̨
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              contra experientiam, quia ea, quæ feruntur ſursùm
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              in aqua, tanta vi aſcendunt, quanta eſt grauitas,
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              qua moles aquæ æqualis corpori demerſo ſuperat
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              huiusmet grauitatem, quod perindè eſt, ac ſi dica­
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              tur impetum ſursùm menſurari à differentia grauita­
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              tum aeris, & aquæ gr. 2. non autem ab aggregato
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              gr. 6. leuitatis illius, & grauitatis huius. </s>
              <s id="s.000598">Quaprop­
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              ter non poterit aer, vel
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              ſursùm impelli ab eius
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              leuitate poſitiua. </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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            <p type="margin">
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              Prop. 53.</s>
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            <p type="main">
              <s id="s.000601">
                <emph type="center"/>
              PROP. LVIII.
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            </p>
            <p type="main">
              <s id="s.000602">
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              Idipſum ostendere poſito quòd aer, & aqua vtramque vim
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              leuitatis, & grauitatis exerceat.
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                <emph.end type="center"/>
              </s>
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            <p type="main">
              <s id="s.000603">SVpponamus ſecundo loco tam
                <expan abbr="aerẽ">aerem</expan>
              , quàm
                <expan abbr="aquã">aquam</expan>
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              ſemper retinere ambas oppoſitas qualitates,
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              ſcilicèt perpetuò afficiantur ijſdem gradibus graui­
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              tatis, atque leuitatis ſitque leuitas aeris F trium gra­
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              duum, & maior leuitate ipſius aquæ D vnius gradus;
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              at è contrà gradus grauitatis eiuſdem aeris F gra­
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              dus vnius minor ſit pondere graduum 3. molis aquæ
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              D, quæ æqualis ſit ipſi F, habebimus profectò qua-</s>
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