Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              Definitio III.
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              Impetus eſt qualitas exigens motum, ſeu fluxum localem ſui ſubiecti, vel
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              qua est cauſa proxima motus illius mobilis, cui ineſt, eo ſcilicet modo, quo
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              poteſt eſſe cauſa motus.
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              <s id="N1141C">Dico eſſe qualitatem ſiue diſtincta ſit, ſiue non diſtincta; </s>
              <s id="N11420">quod hîc
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              certè non diſcutio; </s>
              <s id="N11426">nec enim affirmo in hac definitione dari impetum; </s>
              <s id="N1142A">
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              ſed definio tantùm quid ſit impetus; </s>
              <s id="N1142F">qui reuera aliud non eſt, ſi eſt: </s>
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              quippe id tantùm concipio, cum impetum appello; </s>
              <s id="N11438">ſiue ſit, ſiue non ſit,
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              ne quis fortè initio ſtatim mihi litem intendat; </s>
              <s id="N1143E">quemadmodum definit
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              circulum Geometra; </s>
              <s id="N11444">licèt non aſſerat dari perfectum circulum; </s>
              <s id="N11448">ita Phy­
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              ſicus definit impetum, quamuis non affirmet dari impetum; </s>
              <s id="N1144E">quod tamen
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              in ſexto Theoremate demonſtrabimus; </s>
              <s id="N11454">itaque ſi eſt impetus, haud dubiè
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              nihil omninò præſtat in ſuo ſubiecto niſi motum; quod quomodò fiat,
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              explicabimus intrà in Theorematis. </s>
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              Hypotheſis I.
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            <p id="N1146B" type="main">
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              Datur motus localis
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              ; </s>
              <s id="N11476">quis enim non videt volantem auem, natantem
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              piſcem; currentem equum, rotatum globum; denique vnum corpus mi­
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              grans è loco in locum? </s>
              <s id="N1147E">ſed hoc eſt moueri per Def. 1. igitur infinitis fe­
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              rè experimentis nititur hæc hypotheſis, quam veram eſſe neceſſe eſt, ſi
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              illa vera ſunt; ſed illa certa ſunt phyſicè, neque citra miraculum fallere
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              poſſunt. </s>
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            <p id="N1148A" type="main">
              <s id="N1148C">Diceret fortè aliquis etiam motum ſubeſſe oculorum fallaciæ; cùm è
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              naui mobili littus ipſum moueri, ipſumque nauigium non moueri iudi­
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              cemus. </s>
              <s id="N11494">Quis enim oculos in Solem intendens, primo intuitu Solem ſta­
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              re non iudicet? </s>
              <s id="N11499">cum tamen deinde perniciſſimo curſu rotari demonſtre­
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              mus; </s>
              <s id="N1149F">adde alias oculorum fallacias circa motum; </s>
              <s id="N114A3">ſic rotata ſcintilla, vel
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              carbo accenſus immotum orbem deſcribere videtur; </s>
              <s id="N114A9">ſic nota inuſta
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              trocho, dum celerrimè rotatur, orbem etiam immobilem deſcribere iu­
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              dicatur; </s>
              <s id="N114B1">ſic ſtella cadens, vel exhalatio continenti ſucceſſione accenſa
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              moueri videtur; </s>
              <s id="N114B7">licet minimè moueatur; </s>
              <s id="N114BB">idem dicendum de puluere
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              tormentario, vel alia qualibet materia; quæ continuata conſecutione
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              accenditur; </s>
              <s id="N114C3">immò trochus ipſe in orbem celerrimè agitatus, quieſcere
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              videtur; </s>
              <s id="N114C9">ſic qui vertigine laborant, ea moueri exiſtimant, quæ quieſcunt; </s>
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              idem exemplum habemus in ebrioſis, iracundis, in iis qui ex graui febris
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              ardore delirant, & in pueris qui diu in gyros eunt, vbi verti deſierint; </s>
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              ſic eorum quæ motu æquali feruntur, remotiora tardiùs moueri viden­
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              tur; </s>
              <s id="N114DB">immò ſi per eandem lineam oculus, & mobile pari velocitate ince­
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              dant, ipſum mobile quieſcere videtur, plura leges apud Opticos, de
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              quibus agemus ſuo loco: Igitur ex his omnibus conſtat minimè conſta­
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              re dari motum, ex eo quòd oculis aliquid moueri videatur. </s>
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              <s id="N114E7">Reſpondeo equidem fateri me, viſum ipſum plurimis ſubeſſe fraudi­
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              bus; </s>
              <s id="N114ED">attamen ſi rectè oculus admoueatur, iuſta diſtantià, nec vllum ſit
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              impedimentum exterius nec interius; </s>
              <s id="N114F3">fieri non poteſt, quin oculus mo­
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              tum obſeruet; an fortè currentis calami motus oculum meum fallere po-</s>
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