Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              <s id="N10589">
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                <expan abbr="proportionẽ">proportionem</expan>
              virium ad
                <expan abbr="reſiſtentiã">reſiſtentiam</expan>
              : tùm denique, quia, cùm modico
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              impetu agitari poſſint ab aëre mobili, vnus motus alium impedit. </s>
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              <s id="N1059E">12. Singulis inſtantibus motus naturaliter accelerati creſcit
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              reſiſtentia; </s>
              <s id="N105A4">quia, cùm motus creſcat, æqualibus temporibus, plures
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              partes medij occurrunt; </s>
              <s id="N105AA">creſcunt tamen vires in eadem proportio­
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              ne, ſcilicet, impetus: igitur non mutatur progreſſio motus. </s>
              <s id="N105B0">Hinc
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              colligo, contra Galilæum, motum rectum ex naturaliter accelerato
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              nunquam fieri æquabilem: dixi motum rectum; quia motus corpo­
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              rum cœleſtium ex accelerato factus eſt æqualis. </s>
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              De motu violento ſurſum.
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              <s id="N105CE">1. MOtus violentus ſurſum vulgò dicitur eſſe à principio ex­
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              trinſeco. </s>
              <s id="N105D3">Triplici modo accidere poteſt: </s>
              <s id="N105D7">primò, ſi reuerà
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              imprimatur impetus ab extrinſeco, vt, cùm mitto lapidem ſurſum: </s>
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              ſecundò, ſi corpus deorſum cadens deinde reflectatur ſurſum; </s>
              <s id="N105E2">tunc
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              autem nihil eſt ab extrinſeco, niſi determinatio noua, quæ eſt à cor­
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              pore reflectente: </s>
              <s id="N105EA">tertiò, ſi terra vtrinque eſſet peruia; </s>
              <s id="N105EE">nam lapis haud
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              dubiè non ſiſteret in centro, ſaltem poſt primum deſcenſum; </s>
              <s id="N105F4">igitur
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              aſcenderet per eandem lineam; </s>
              <s id="N105FA">nullum tamen eſt principium ex­
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              trinſecum; igitur motus violentus dicit tantùm motum ſurſum
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              corporis grauis. </s>
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              <s id="N10604">2. Dari autem motum violentum, dubium eſſe non poteſt, qui
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              ſupponit impetum, vel impreſſum ab extrinſeco, vel in deſcenſu
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              acquiſitum, qui reuerâ ineſt ipſi mobili, cùm ipſum medium hunc
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              motum potiùs impediat, quàm iuuet: </s>
              <s id="N1060E">hinc, ſi nullus eſſet impetus
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              extrinſecus, vel acquiſitus, nullus eſſet motus violentus; quia im­
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              petus innatus illius cauſa eſſe non poteſt. </s>
              <s id="N10616">Portò hic motus non eſt
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              acceleratus, nec æqualis, alioquin
                <expan abbr="nunquã">nunquam</expan>
              rediret deorſum mobile. </s>
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              <s id="N10621">3. Hinc neceſſariò eſt retardatus: </s>
              <s id="N10625">igitur deſtruitur impetus, non
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              quidem ab ipſa medij reſiſtentia; </s>
              <s id="N1062B">quippe idem medium non magis
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              reſiſtit motui ſurſum, quàm motui deorſum, vt patet: </s>
              <s id="N10631">igitur deſtrui­
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              tur ille impetus motus violenti ab impetu innato aliquo modo; </s>
              <s id="N10637">non
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              quidem vt à contrario ratione entitatis, ſed ratione determinatio­
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              nis: </s>
              <s id="N1063F">cùm enim impetus innatus exigat motum deorſum, & alius ſur­
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              ſum: </s>
              <s id="N10645">hic quidem præualet, attamen fruſtrà eſt, ratione gradus
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              æqualis impetui innato: igitur deſtruitur ille gradus illo inſtanti. </s>
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