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

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              SVPPOSITIO VI.
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              <s id="s.000571">SVpponit præterea Aristoteles, quòd velocitas,
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              qua idem corpus aſcendit, vel deſcendit in di­
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              uerſis medijs fluidis eamdem proportionem habet,
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              quam raritates, vel conſiſtentiæ eorumdem fluido­
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              rum, ver. gr. ſi aer eſſet decies rarior, ac diſtrahibi­
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              lior, & faciliùs penetrabilis, quam ſit aquæ, eadem
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              pila marmorea deſcendet cubitalem altitudinem ae­
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              ris decies velociùs, quàm profunditatem aquę pa­
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              riter cubitalem, ſcilicèt ſi prædictum aereum
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              pertranſeat in vnica arteriæ pulſatione, aquæ altitu­
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              dinem percurret in decem eiuſdem arteriæ pulſ
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              ationibus.</s>
              <s id="s.000572">Idemque in aſcenſu corporum leuium iuxtà
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              Ariſtotelis ſententiam dici debet.</s>
              <s id="s.000573">His præmiſſis.
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              PROP. LV.
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              Oſtendendum eſt Ignem non eſſe leuem, nec aſcendere vi
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              leuitatis eius poſitiuæ.
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              <s id="s.000576">ET primò extrema corpora ſimplicia, ſcilicèt i­
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              gnis & terra, vel
                <expan abbr="hydrargyrũ">hydrargyrum</expan>
              , aut aurum fuſum, vel quodlibet aliud grauiſſimum corpus, iuxtà Ari­
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              ſtotelis effatum ſi fieri poteſt, ſint abſolutè grauia, &
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              leuia itaut ignis habeat quatuor gradus leuitatis, &
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              nullam prorsùs grauitatem, è contrà terra, vel hy­
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              drargyrum quatuor gradus grauitatis habeat, nullam
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              verò leuitatem, ſic enim terra erit abſolutè, & om­
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              ninò grauis, ignis verò abſolutè leuis, ergò (ex prop.</s>
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