Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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            <p id="N17BF5" type="main">
              <s id="N17C05">
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              motorem, aut aerem impellentem, habere propriam virtu­
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              tem motiuam intrinſecam, ipſis à proijciente, vel ambiente
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              impreſſam, per quam proximè feruntur quò diriguntur, ſicut
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              per leuitatem ſurſum, ac per grauitatem deorſum. </s>
              <s id="N17C22">Quam
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              quidem virtutem, vt vidimus, ſæpè ipſe inſinuat, & à neote­
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              ricis rem diſtinctius pertractantibus vocatur impetus, ſeu
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              impulſus. </s>
              <s id="N17C2B">Qui cum diu non perſeueret in ſubiecto, nec ei
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              competat ex natura ſua:
                <expan abbr="Cumq">Cumque</expan>
              determinatè tantum va­
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              leat mouere iuxta proijcientis directionem, non ſequitur il­
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              lud inconueniens, quod Ariſtoteles pro ratione dubitandi
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              propoſuerat, nimirum fore, vt proiecta
                <expan abbr="mouerẽtur">mouerentur</expan>
              à ſeipſis,
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              & ab intrinſeco, non ſecus ac animalia, vel ſaltem corpora,
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              quæ natura mouentur, non violentia. </s>
              <s id="N17C3E">Non ſufficit enim mo­
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              ueri à principio intrinſeco ad conſtituendum motum natu­
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              ralem, ſed amplius requiritur, vt ipſum principium ſit ſtabi­
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              le, ac naturæ debitum, cuiuſmodi non eſt virtus impreſſa
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              proiectis. </s>
            </p>
            <p id="N17C49" type="main">
              <s id="N17C4B">Iam verò quàm neceſſariò admittenda ſit talis qualitas,
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              ſeu virtus impreſſa, quidquid ſenſerit Ariſtoteles, ex eo vel
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              maximè intelligitur, quòd abſque illa inſufficiens ſit ſolus
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              aer concitatus ad perficiendum motum proiectorum, etſi
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              ad ipſum
                <expan abbr="quandoq.">quandoque</expan>
              concurrat. </s>
              <s id="N17C5A">Senſu enim conſtat, nulla
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              ventorum irruentium vi quieſcentem lapidem, aut plum­
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              beam pilam poſſe ſuſtolli, & in longinqua transferri, ſicut
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              nec ligneam, aut ferream rotam conuolui, & alia eiuſmodi
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              corpora promoueri; quæ tamen impetu incuſſo, facilè præ­
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              ſtantur à manu, etiam contra omnem ventorum conatum
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              vehementiſſimè ex aduerſo perflantium. </s>
              <s id="N17C69">Imò & ferreas
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              pilas contra eundem flatum videmus è tormentis explodi,
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              ac non minus mænia quatere; & ingentia ſaxa eminus ac
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              ſumma celeritate per aera ferri, ipſo aere in contrarium ni­
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              tente, ac repellente. </s>
              <s id="N17C74">Vanumque videtur illud effugium,
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              flante vento, quamuis totus aer commoueatur, pars tamen
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              aeris, quæ tangit proiectum, cum vnitè magis moueatur à
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              proijciente, maiorem vim obtinere ad promouendum, quàm
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              vllum ventum in contrarium. </s>
              <s id="N17C7F">Siquidem veluti per follem, </s>
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