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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              PROP. XLII.
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              Et primò oſtendemus, quòd quodlibet corpus à principio in­
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              trinſeco, & naturali ſponte translatum faciliùs, &
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              celeriùs mouebitur in fluido rariori, & tenuio­
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              ri, quàm in medio fluido craſſo, &
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              tenaciori.
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              <s id="s.000470">SInt duo vaſa GHIK, alterum KILM,
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              aqua
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              repleatur, ſecundum verò hydrargyro, immer­
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              gatur verò eadem pila lignea A in vtroque fluido, in­
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              telliganturque duæ moles ſpatiales ex prædictis flui­
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              dis B, & C, quæ æquales ſint ipſi A, eique
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                bant</expan>
              , patet ergò quòd mercurij moles C grauior re­
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              ſiſtentior, denſior, atque compactior eſt, quàm ſit
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              moles aquę B. præterea pila lignea
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              A nullo pacto aſcendere ſursùm po­
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              teſt, niſi aquam B, ab eius loco ex­
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              pellat vt ei locum cedat, atque mo­
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              les ipſius ligni A
                <expan abbr="trãsferatur">transferatur</expan>
              ad oc­
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              cupandum ſpatium ei æquale B, &
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              hoc ſemper contingit, vbique enim
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              in
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              cogitur continuato niſu
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              ſursùm impellere incumbentem a­
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              quæ molem ei æqualem, tenacita­
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              temque eius penetrare, ponatur iam gradus natura­
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              lis impetus leuitatis ipſius ligni eſſe D, quia verò cor­
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              pus motiuum A impetu D affectum impellit corpus
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              B fluidum, quod in quiete conſtitutum ſua naturali </s>
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