Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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            <p id="N17C97" type="main">
              <s id="N17CDB">
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              reſiſtentiam ex parte grauitatis, vt dicebamus; quod eſt
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              contra experientiam. </s>
            </p>
            <p id="N17CE9" type="main">
              <s id="N17CEB">Demum ratio à priori videtur, quoniam aer ex ſe quie­
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              tus eſt, nec poteſt aliud mouere, niſi ipſe ab alio moueatur,
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              & impellatur: dum autem impellitur, vel accipit virtutem
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              aliquam ab impellente, vel nullam: ſi aliquam accipit, eam
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              potius, vel ſimilem dicemus accipere proiectum immedia­
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              tè: ſi nullam accipit; ergo tamdiu poterit impellere quam.
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              </s>
              <s id="N17CF9">diu actu impellitur (vt baculus, vel aliud inſtrumentum ma­
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              nu dimotum ad aliud impellendum) ceſſante verò impul­
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              ſore, ipſe quoque ab impulſu deſiſtet. </s>
              <s id="N17D00">Quod idem conclu­
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              ditur de pluribus, ac pluribus intermedijs, quan do alterum
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              ab altero nullam accipit virtutem inhærentem, ſed pendent
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              ab actuali influxu, ac motione prioris. </s>
              <s id="N17D09">At ſenſu conſtat ceſ­
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              ſante primo motore, ſeu proijciente, adhuc proiecta perfer­
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              ri vlteriuſque propelli: Ergo vel non propelluntur ab aere,
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              vel aer propellens non abſque virtute à proijciente recepta
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              propellit. </s>
              <s id="N17D14">Semel autem admiſſa huiuſmodi virtute impul­
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              ſiua in aere, multo magis ac potiori iure admittenda erit
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              in ipſis proiectis. </s>
            </p>
            <p id="N17D1B" type="main">
              <s id="N17D1D">Quod ſi dicatur proiectum ſemper impelli ab aere ſucce­
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              dente à tergo ad replendum vacuum, quod ab ipſo proiecto
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              relinquitur, nulla vi ab alio recepta, vel in vlteriores partes
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              aeris transfuſa; tunc concluderetur, huiuſmodi motum ne­
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              ceſſario eſſe perennem. </s>
              <s id="N17D28">Quandoquidem ſicut nunquam
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              ceſsat naturalis illa propenſio, qua corpora feruntur ad re­
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              plendum vacuum, ita nunquam ceſſare poſſet effectus ma­
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              nans ab illa; quod cum ſit falſum, remanet, & falſum eſſe il­
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              lud, ex quo ſequitur. </s>
            </p>
            <p id="N17D33" type="main">
              <s id="N17D35">Cum igitur aer commotus, vel aliud medium, tanquam
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              inſtrumentum proijcientis, non ſufficiat ad
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              mo­
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              tum proiectorum, poſtquam ea ab ipſo proijciente receſſe­
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              rint, nec aliud ad id præſtandam appareat, remanet cauſam
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              proximam, ac principalem motus prædicti eſſe ipſamet cor­
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              pora proiecta, prout informata qualitate impetus, quem </s>
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          </chap>
        </body>
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