Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              modico ferè niſu ſeiungantur, & loco cedant; </s>
              <s id="N180EE">ſed de his ſtatibus cor­
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              porum fusè agemus Tomo 5. adde quod ad medium ſufficit vacuum ſi
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              motus in vacuo eſſe poteſt, de quo alibi; quod certè eſt omnium me­
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              diorum optimum, cum nullo modo reſiſtar mobili. </s>
            </p>
            <p id="N180F8" type="main">
              <s id="N180FA">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              79.
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              </s>
            </p>
            <p id="N18106" type="main">
              <s id="N18108">
                <emph type="italics"/>
              Hinc producitur impetus imperfectior in medio denſiore:
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              quia in eo tar­
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              dior eſt motus, ex cuius tarditate arguitur imperfectio impetus per Ax.
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              13.num.4. </s>
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            <p id="N18115" type="main">
              <s id="N18117">
                <emph type="center"/>
                <emph type="italics"/>
              Scholium.
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                <emph.end type="center"/>
              </s>
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            <p id="N18123" type="main">
              <s id="N18125">Obſerua denſitatem medij cognoſci ex eius grauitate; </s>
              <s id="N18129">illud enim
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              denſius eſt, quod eſt grauius & viciſſim; </s>
              <s id="N1812F">quod fusè explicabimus ſuo lo­
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              co; </s>
              <s id="N18135">eſt enim grauitas quædam
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              denſitas, vt ait
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              Philoſophus
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              tùm l.
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              4.
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              pb.c.
                <emph.end type="italics"/>
                <lb/>
              9.
                <emph type="italics"/>
              t.
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              85. & 86.
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              denſum & rarum,
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              inquit,
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              ſunt lationis efficientia,
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              & paulò ſu­
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              periùs; </s>
              <s id="N18160">
                <emph type="italics"/>
              eſt autem denſum graue, rarum verò leue, & l.
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              8.
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              c.
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              7.
                <emph type="italics"/>
              t.
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              55.
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              hæc habet,
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              graue & leue; molle & durum denſitates quædam eſſe, & raritates videntur,
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              quæ adnotare volui, vt vel inde conſtet doctrinam hanc cum Peripate­
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              tica optimè conſentire. </s>
            </p>
            <p id="N18180" type="main">
              <s id="N18182">Obſeruabis etiam hîc à me non diſcuti, in quo conſiſtat denſitas, vel
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              raritas, grauitas, vel leuitas; </s>
              <s id="N18188">ſuppono tantùm graue illud eſſe, quod ten­
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              dit deorſum; </s>
              <s id="N1818E">leue illud, quod tendit ſurſum ſiue pellatur à grauiori, ſiue
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              non, denſum verò eſſe id quod multùm materia habet ſub parua exten­
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              ſione, rarum è contrario; quorum omnium cauſas, & rationes ſuo loco
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              explicabimus. </s>
            </p>
            <p id="N18198" type="main">
              <s id="N1819A">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              80.
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              </s>
            </p>
            <p id="N181A6" type="main">
              <s id="N181A8">
                <emph type="italics"/>
              Sub medium leuius corpus graue deſcendit
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              ; </s>
              <s id="N181B1">certa eſt hypotheſis, niſi for­
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              tè aliquando per accidens ſecus accidat; </s>
              <s id="N181B7">ratio porrò petitur ex ipſa
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              grauitatis natura, quâ corpus graue tendit deorſum; </s>
              <s id="N181BD">nihil enim aliud
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              grauitas eſt, quidquid tandem illa ſit; </s>
              <s id="N181C3">quippe corpus graue deſcendit,
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              quando medium liberum habet, idemque leuius, per quod deſcendat; </s>
              <s id="N181C9">
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              quod certè ſi grauius eſſet, haud dubiè non deſcenderet; </s>
              <s id="N181CE">ſic ferrum, &
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              ſaxum plumbo liquato innatant; </s>
              <s id="N181D4">cum tamen per mediam aquam de­
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              ſcendant; </s>
              <s id="N181DA">fic lignum aquæ ſupernatat, quod per liberum aëra deſcendit; </s>
              <s id="N181DE">
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              ratio eſt, quia grauius deſcendit ſub medium leuius; </s>
              <s id="N181E3">cur autem id fiat
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              fusè alibi explicabo; id tantùm obiter indico. </s>
              <s id="N181E9">Omnis motus, qui fit à
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              principio intrinſeco per lineam rectam propter locum eſt, vt patet; quis
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              enim neget corpus graue ideo deſcendere ſub leuius, vt occupet aliquem
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              locum quo prius carebat, qui tamen illi connaturalis eſt in hoc rerum
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              ordine? </s>
              <s id="N181F5">cum à natura acceperit vim illam intrinſecam, quâ in eum lo­
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              cum ſeſe recipere poteſt; </s>
              <s id="N181FB">quam certè vim intrinſecam nunquam à na­
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              tura rebus creatis inſitam eſſe conſtat, niſi ad eum finem conſequendum,
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              cui à natura deſtinantur; </s>
              <s id="N18203">cur verò locus connaturalis corporis grauio­
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              ris ſit ille, in quo leuiori ſubeſt, non diu hærebit animus, quin ſtatim ra­
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              tio affulgeat; </s>
              <s id="N1820B">cum enim corpus, quod eſt ſuprà, ſuſtineatur ab eo quod eſt
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              infrà; </s>
              <s id="N18211">illud certè infra eſſe connaturalius eſt, quod aptius eſt ad ſuſtinen-</s>
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