Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              libus, in quo oſtendemus ideo lignum ſurſum emergere, quia ab aqua
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              extenditur, & ideo corpora ſurſum ire, quia alia deorſum eunt. </s>
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              <s id="N17FDE">
                <emph type="center"/>
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              Theorema
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              74.
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              </s>
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            <p id="N17FEA" type="main">
              <s id="N17FEC">
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              Quando lapis deſcendit per medium aëra, impeditur aliquantulum eius
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              motus
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              : </s>
              <s id="N17FF7">Probatur primò experientiâ, quæ certa eſt; </s>
              <s id="N17FFB">tàm enim aër impe­
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              dit motum deorſum, quàm ſurſum, vt videre eſt in mobili leuiore ſeu ra­
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              riore, quod etiam flante vento obſeruare omnes poſſunt; </s>
              <s id="N18003">quomodo ve­
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              rò impediat, dicemus aliàs; </s>
              <s id="N18009">ſecundò corpus immobile, in quod mobile
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              impingitur, motum illius impedit; </s>
              <s id="N1800F">ſed in diuerſas partes aëris corpus
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              graue impingitur in deſcenſu; igitur aliquantulum impeditur eius
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              motus. </s>
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            <p id="N18017" type="main">
              <s id="N18019">
                <emph type="center"/>
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              Theorema
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              75.
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              </s>
            </p>
            <p id="N18025" type="main">
              <s id="N18027">
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              Hinc motus naturalis deorſum aliquantulum retardatur,
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              quia nihil aliud
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              præſtare poteſt huiuſmodi impedimentum, niſi aliquam retardationem;
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              igitur motus inde redditur tardior. </s>
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            <p id="N18034" type="main">
              <s id="N18036">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              76.
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              </s>
            </p>
            <p id="N18042" type="main">
              <s id="N18044">
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              Hinc etiam impetus producitur imperfectior
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              ; quia ex imperfectione ef­
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              fectus requiritur imperfectio cauſæ per Ax. 13.l. </s>
              <s id="N1804F">1. & quâ proportione
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              eſt tardior motus eâdem impetus eſt imperfectior, per Ax. 5. excipe ta­
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              men impetum innatum, qui ſemper habet eundem effectum grauitatio­
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              nis, vel ſingularis, quâ grauitas cum ipſo medio, ſi reuerâ medium gra­
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              uitat, de quo aliàs. </s>
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            <p id="N1805C" type="main">
              <s id="N1805E">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              77.
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              </s>
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            <p id="N1806A" type="main">
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              Quo medium denſius eſt plus impedit motum deorſum
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              ; </s>
              <s id="N18075">Probatur, quia ſi
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              motum impedit; certè non totum; quis enim hoc dicat; </s>
              <s id="N1807B">ſed eæ dumta­
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              xat partes, quibus incubat corpus graue; </s>
              <s id="N18081">igitur quò ſunt plures huiuſ­
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              modi partes, maius eſt impedimentum; </s>
              <s id="N18087">ſed in medio denſiori plures ſunt
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              cum minore extenſione; </s>
              <s id="N1808D">hoc enim eſt, quod voco denſius; igitur me­
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              dium denſius plùs impedit. </s>
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            <p id="N18093" type="main">
              <s id="N18095">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              78.
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              </s>
            </p>
            <p id="N180A1" type="main">
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              Hinc tardiùs deſcendit mobile per mediam aquam, quàm per medium
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              aëra,
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              quia aqua eſt denſior aëre. </s>
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            <p id="N180AD" type="main">
              <s id="N180AF">
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              Scholium.
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              </s>
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              <s id="N180BD">Obſerua eſſe aliqua corpora minus denſa, quæ motum omninò im­
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              pediunt; </s>
              <s id="N180C3">quippe certum eſt aquam eſſe denſiorem ligno; </s>
              <s id="N180C7">atqui li­
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              gnum deſcenſum lapidis impedit, non verò aqua; </s>
              <s id="N180CD">quia ſcilicet lignum
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              non eſt medium, vt aqua; </s>
              <s id="N180D3">vt enim aliquod corpus ſit medium, debet eſſe
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              liquidum, vt, aqua & alij liquores; vel ſpirabile vt aër, vapor, &c. </s>
              <s id="N180D9">ratio
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              eſt, quia partes ligni, vel alterius corporis durioris, ita ſunt inter ſe con­
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              junctæ, vel implicatæ, vt omnem tranſitum intercludant, niſi corpus ip­
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              ſum graue valido ictu vel impetu ſibi viam aperiat; </s>
              <s id="N180E3">igitur vt corpus ali­
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              quod vice medij defungatur, debet in eo ſtatu eſſe, in quo eius partes </s>
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