Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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              <s>
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              ſuarum fundamentum deſumunt ab Hypotheſibus, etiamſi deinde
                <lb/>
              ſecundum leges Mechanicas accuratiſſime procedant; Fabulam qui­
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              dem elegantem forte & venuſtam, Fabulam tamen concinnare di­
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              cendi ſunt. </s>
            </p>
            <p type="main">
              <s>Relinquitur adeo tertium genus, qui Philoſophiam ſcilicet Ex­
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              perimentalem profitentur. </s>
              <s>Hi quidem ex ſimpliciſſimis quibus
                <lb/>
              poſſunt principiis rerum omnium cauſas derivandas eſſe volunt:
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              nihil autem Principii loco aſſumunt, quod nondum ex Phænome­
                <lb/>
              nis comprobatum fuerit. </s>
              <s>Hypotheſes non comminiſcuntur, neque
                <lb/>
              in Phyſicam recipiunt, niſi ut Quæſtiones de quarum veritate diſ­
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              putetur. </s>
              <s>Duplici itaque Methodo incedunt, Analytica & Syn­
                <lb/>
              thetica. </s>
              <s>Naturæ vires legeſque virium ſimpliciores ex ſelectis
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              quibuſdam Phænomenis per Analyſin deducunt, ex quibus deinde
                <lb/>
              per Syntheſin reliquorum conſtitutionem tradunt. </s>
              <s>Hæc illa eſt
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              Philoſophandi ratio longe optima, quam præ ceteris merito am­
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              plectendam cenſuit Celeberrimus Auctor noſter. </s>
              <s>Hanc ſolam uti­
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              Q.E.D.gnam judicavit, in qua excolenda atque adornanda operam
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              ſuam collocaret. </s>
              <s>Hujus igitur illuſtriſſimum dedit Exemplum,
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              Mundani nempe Syſtematis explicationem e Theoria Gravitatis
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              feliciſſime deductam. </s>
              <s>Gravitatis virtutem univerſis corporibus in­
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              eſſe, ſuſpicati ſunt vel finxerunt alii: primus Ille & ſolus ex Ap­
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              parentiis demonſtrare potuit, & ſpeculationibus egregiis firmiſſi­
                <lb/>
              mum ponere fundamentum. </s>
            </p>
            <p type="main">
              <s>Scio equidem nonnullos magni etiam nominis Viros, præjudiciis
                <lb/>
              quibuſdam plus æquo occupatos, huic novo Principio ægre aſſen­
                <lb/>
              tiri potuiſſe, & certis incerta identidem prætuliſſe. </s>
              <s>Horum famam vel­
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              licare non eſt animus: Tibi potius, Benevole Lector, illa paucis ex­
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              ponere lubet, ex quibus Tute ipſe judicium non iniquum feras. </s>
            </p>
            <p type="main">
              <s>Igitur ut Argumenti ſumatur exordium a ſimpliciſſimis & pro­
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              ximis; deſpiciamus pauliſper qualis ſit in Terreſtribus natura Gra­
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              vitatis, ut deinde tutius progrediamur ubi ad corpora Cæleſtia, lon­
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              giſſime a ſedibus noſtris remota, perventum fuerit. </s>
              <s>Convenit jam
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              inter omnes Philoſophos, corpora univerſa circumterreſtria gra­
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              vitare in Terram. </s>
              <s>Nulla dari corpora vere levia, jamdudum
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              confirmavit Experientia multiplex. </s>
              <s>Quæ dicitur Levitas relativa,
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              non eſt vera Levitas, ſed apparens ſolummodo; & oritur a præ­
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              pollente Gravitate corporum contiguorum. </s>
            </p>
            <p type="main">
              <s>Porro, ut corpora univerſa gravitant in Terram, ita Terra viciſ­
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              ſim in corpora æqualiter gravitat; Gravitatis enim actionem eſſe
                <lb/>
              mutuam & utrinque æqualem, ſic oſtenditur. </s>
              <s>Diſtinguatur Terræ </s>
            </p>
          </chap>
        </body>
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