Gassendi, Pierre, De proportione qua gravia decidentia accelerantur, 1646

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              <s id="s.001832">
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              quàm verſus aliam regionem; ideò ratiocinatus ſum
                <lb/>
              huiuſmodi motus principium eſſe debere vel in aëre, à
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              quo quam-ptimùm lapis fuerit contactus, cœperit mo­
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              ueri; vel in Terra, verſus quam, non aliò inſtitutus mo­
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              tus fuerit; non verò in lapide ipſo, qui quandiù ſolus
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              fuerit, nihilque externum ad ipſum appulerit, ipſumve
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              contigerit, eo motu caruerit. </s>
              <s id="s.001833">Rurſus autem, quia ani­
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              maduerti, ſi nihil vſquàm rerum eſſet, præter aërem, ac
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              in aëre lapidem, non fore cur lapis in hanc potiùs par­
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              tem, quàm in aliam quamlibet ferretur; idcircò con­
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              cluſi, cùm lapis cœperit verſus
                <expan abbr="Terrã">Terram</expan>
              ferri, debere ſaltem
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              primam motus cauſſam ab ipſa Terra procedere; vnde
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              & attracticem vim in ipſa Terra eſſe conceſſi. </s>
              <s id="s.001834">Et quòd
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              talis vis eſſe non poſſit procùl actuoſa, propè otioſa;
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              ideò ex illius actione continente in lapidem, collegi
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              eſſe neceſſarium inualeſcere impetum, ſeu accelerari in
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              lapide motum. </s>
              <s id="s.001835">Quoniam verò peruidere ſum viſus ex
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              ſola hac attractione non poſſe explicari proportionem
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              eiuſce accelerationis; & aliunde reputaui aërem, tamet­
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              ſi non poſſit fieri cauſſa initij motus, poſſe nihilomi­
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              nus motum ſemel cœptum iuuare, ac veluti prouchere;
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              idcircò illum quoque adhibui, & ex eius vi impulſiua,
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              cum attractrice terræ coniuncta compoſui cauſſam
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              proportionis integram, quo legiſti modo. </s>
              <s id="s.001836">Hæc re­
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              peto autem, vt tibi inſinuem, quamobrem non modò
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              accelerationem, ſed ipſum quoque motum, ſiue pri­
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              mum initium motus, qui à te dicitur deſcenſus, eſſe à
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              principio externo cenſuerim. </s>
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              <s id="s.001837">X. </s>
              <s id="s.001838">Ratio aliunde mihi fuit, quòd nihil videretur
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              magis conſentaneum, quàm motum foueri, incremen-</s>
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