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

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              Cap. 6. non
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              dari attracti­
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              onem.</s>
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              PROP. CXXVIII.
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              Corpora, quæ attrahi videntur, aut ſponte, aut à vi ex­
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              terna impelluntur.
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              Cap. 25.</s>
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              <s id="s.001386">ET primò quoad ferrum, & magnetem pertinet,
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              iam oſtendimus (lib. de vi percuſs.) ambo hæc
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              corpora naturali vi ſpontaneo motu vnum versùs al­
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              terum moueri non ſecùs, ac grauia ſponte ad terram
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              feruntur. </s>
              <s id="s.001387">In electricis verò iam ab alijs cauſa attra­
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              ctionis tradita eſt; conſtat enim experientia, quod
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              niſi electrica corpora incaleſcant ope confricationis
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              in aliquo panno factæ non attrahunt exiguas, & leues
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              eiſque vicinas feſtucas, quæ proindè collocantur in
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              quadam veluti atmoſphæra ex fumoſis, & calidis ex­
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              halationibus compoſita ambiente corpus
                <expan abbr="electricũ">electricum</expan>
              ,
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              ex quo fit vt maſſa illa ex prædictis vaporibus, & fe­
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              ſtucis compoſita leuior ſit aere contiguo magis re­
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              moto, ideoque ab hoc maſſa illa fumoſa exprimitur,
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              conſtringiturque vndique versùs
                <expan abbr="ſolidũ">ſolidum</expan>
              corpus ele­
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              ctricum, &
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              ſecum
                <expan abbr="trãſportabit">tranſportabit</expan>
              feſtucas. </s>
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            <p type="main">
              <s id="s.001388">In tubis pneumaticis, & cteſibianis, nec non in cu­
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              cur bitulis medicis, dicendum, quòd ad eas fluida, &
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              mollia corpora feruntur non ſpontaneo motu, ſed à vi
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              externa impulſa, & hæc profectò non eſt alia quàm̨
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              ſimplex grauitas oceani aerei
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              terraqueum am­
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              bientis, à quo aqua, & corpora mollia ſubiecta
                <expan abbr="cõ-primuntur">com
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                primuntur</expan>
              , exprimunturque, vt conſtat ex doctriną
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              hydroſtatica ſuperiùs expoſita. </s>
              <s id="s.001389">Hinc fit vt ſubleua-</s>
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