Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              quo percurritur primum ſpatíum AB; </s>
              <s id="N17A8A">ſimiliter totum ſpatium CG ita
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              percurritur tertio tempore, vt ſingula ſpatia CE. EI. FG. ſingulis in­
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              ſtantibus percurrantur; </s>
              <s id="N17A92">ſed hæc tria inſtantia ſimul ſumpta ſunt æqualia
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              primo inſtanti, quo percurritur ſpatium; licèt primum quo percurritur
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              CE ſit maius ſecundo, quo percurritur EF, & hoc maius tertio, quo per­
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              curritur FG, atque ita deinceps. </s>
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              <s id="N17A9E">Obſeruabis poſſe velocitatem motus explicari duobus modis. </s>
              <s id="N17AA1">Primò,
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              ſi aſſumantur tempora æqualia, & ſpatia inæqualia in ea progreſſione,
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              quam hactenus explicuimus. </s>
              <s id="N17AA8">Secundò ſi accipiantur ſpatia æqualia &
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              tempora inæqualia, quod duobus modis fieri tantùm poteſt. </s>
              <s id="N17AAD">Primò ſi ac­
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              cipiantur ſpatia æqualia primo ſpatio, quod percurritur primo inſtanti. </s>
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              Secundò ſi accipiantur ſpatia æqualia alteri ſpatio, quod in parte tempo­
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              ris ſenſibili percurritur; </s>
              <s id="N17AB9">in qua verò proportione tempora fiant ſemper
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              minora, 'dicemus infrà; </s>
              <s id="N17ABF">nec dicas durum eſſe dicere inſtans eſſe poſſe
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              minus inſtanti; </s>
              <s id="N17AC5">nam equidem fateor inſtanti mathematico nihil eſſe
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              poſſe minus; </s>
              <s id="N17ACB">ſecus verò inſtanti phyſico, quod eſt diuiſibile potentiâ, vt
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              dicemus aliàs; nomine inſtantis phyſici intelligo durationem indiuiſi­
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              bilem, hoc eſt, cuius entitas tota ſimul eſt. </s>
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              <s id="N17AD5">Tertia objectio. </s>
              <s id="N17AD8">Sed inquies, igitur ſecundo tempore æquali primo
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              acquiruntur 2.gradus velocitatis, vel impetus; </s>
              <s id="N17ADE">igitur tria ſpatia ſecun­
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              do tempore percurruntur, quod eſt contra hypotheſim; </s>
              <s id="N17AE4">quippe duo gra­
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              dus impetus accedunt primo, ſimiliter tertio tempore producentur tres
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              gradus impetus; </s>
              <s id="N17AEC">qui ſi iungantur tribus præcedentibus, erunt 6. Igitur
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              percurrentur tertio tempore 6. ſpatia, & quarto 10.quinto 15. quia ſin­
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              gulis inſtantibus debet produci impetus; eſt enim cauſa neceſſaria ap­
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              plicata. </s>
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              <s id="N17AF8">Reſpondęo, equidem eo inſtanti, quo percurritur ſpatium BD, pro­
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              duci aliquid impetus, & aliquid eo inſtanti, quo percurritur ſpatium
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              DC; </s>
              <s id="N17B00">ita vt tamen totus ille impetus, qui producitur his duobus inſtan­
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              tibus, ſit æqualis illi, qui producitur primo inſtanti, quo ſcilicet percurri­
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              tur ſpatium AB; </s>
              <s id="N17B08">quia duo illa inſtantia ſimul ſumpta faciunt tempus
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              æquale primo inſtanti; </s>
              <s id="N17B0E">atqui temporibus æqualibus eadem cauſa neceſ­
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              ſaria non impedita æqualem effectum producit per Ax.3.hinc vides ſin­
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              gulis inſtantibus eadem proportione decreſcere impetum in perfectio­
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              ne, qua tempus eſt breuius, ſeu velocior motus; ſed de hoc infrà. </s>
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              <s id="N17B1A">Quarta objectio; </s>
              <s id="N17B1D">ſi impetus ſingulis inſtantibus creſceret, vel intende­
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              retur, augeretur grauitatio: </s>
              <s id="N17B23">quippe ſi grauitas primo inſtanti producat
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              vnum gradum impetus; </s>
              <s id="N17B29">ſecundo æqualem producet, & tertio, atque ita
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              deinceps, quod eſſet abſurdum; alioqui minima atomus quodlibet cor­
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              pus graue adæquaret, quod eſt abſurdum. </s>
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              <s id="N17B33">Reſpondeo nunquam impetum intendi, niſi ſit motus, qui eſt illius fi­
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              nis; </s>
              <s id="N17B39">alioquin fruſtra eſſet per plura inſtantia; </s>
              <s id="N17B3D">igitur deſtrui deberet; </s>
              <s id="N17B41">nec
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              dicas impetum naturalem etiam fruſtrà eſſe ſine motu; </s>
              <s id="N17B47">quia cum mo­
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              tus non ſit eius finis adæquatus; </s>
              <s id="N17B4D">non mirum eſt ſi poſſit eſſe ſine motu; </s>
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              atqui iam diximus ſuprà habere duos fines, quorum alterum ſemper ha-</s>
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