Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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              ſunt ſumme regulares, & peraguntur in Sectionibus Conicis, nunc
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              valde eccentricis, nunc ad Circulorum proxime formam acceden­
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              tibus; jure quærendum erit, qui fieri poſſit, ut iidem integri con­
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              ſerventur, nec ab actionibus materiæ occurſantis per tot ſæcula
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              quicquam perturbentur. </s>
              <s>Sane ſi motus hi fictitii ſunt magis com­
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              poſiti & difficilius explicantur, quam veri illi motus Planetarum
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              & Cometarum; fruſtra mihi videntur in Philoſophiam recipi:
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              omnis enim Cauſa debet eſſe Effectu ſuo ſimplicior. </s>
              <s>Conceſſa
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              Fabularum licentia, affirmaverit aliquis Planetas omnes & Cometas
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              circumcingi Atmoſphæris, adinſtar Telluris noſtræ; quæ quidem
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              Hypotheſis rationi magis conſentanea videbitur quam Hypothe­
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              ſis Vorticum. </s>
              <s>Affirmaverit deinde has Atmoſphæras, ex natura
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              ſua, circa Solem moveri & Sectiones Conicas deſcribere; qui
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              ſane motus multo facilius concipi poteſt, quam conſimilis motus
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              Vorticum ſe invicem permeantium. </s>
              <s>Denique Planetas ipſos &
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              Cometas circa Solem deferri ab Atmoſphæris ſuis credendum eſſe
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              ſtatuat, & ob repertas motuum cæleſtium cauſas triumphum agat. </s>
              <s>
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              Quiſquis autem hanc Fabulam rejiciendam eſſe putet, idem & alte­
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              ram Fabulam rejiciet: nam ovum non eſt ovo ſimilius, quam Hy­
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              potheſis Atmoſphærarum Hypotheſi Vorticum. </s>
            </p>
            <p type="main">
              <s>Docuit
                <emph type="italics"/>
              Galilæus,
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              lapidis projecti & in Parabola moti deflexio­
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              nem a curſu rectilineo oriri a Gravitate lapidis in Terram, ab oc­
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              culta ſcilicet qualitate. </s>
              <s>Fieri tamen poteſt ut alius aliquis, naſi
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              acutioris, Philoſophus cauſam aliam comminiſcatur. </s>
              <s>Finget igi­
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              tur ille materiam quandam ſubtilem, quæ nec viſu, nec tactu,
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              neque ullo ſenſu percipitur, verſari in regionibus quæ proxime
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              contingunt Telluris ſuperficiem. </s>
              <s>Hanc autem materiam, in di­
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              verſas plagas, variis & plerumque contrariis motibus ferri, & li­
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              neas Parabolicas deſcribere contendet. </s>
              <s>Deinde vero lapidis de­
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              flexionem pulchre ſic expediet, & vulgi plauſum merebitur. </s>
              <s>La­
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              pis, inquiet, in Fluido illo ſubtili natat; & curſui ejus obſequen­
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              do, non poteſt non eandem una ſemitam deſcribere. </s>
              <s>Fluidum
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              vero movetur in lineis Parabolicis; ergo lapidem in Parabola
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              moveri neceſſe eſt. </s>
              <s>Quis nunc non mirabitur acutiſſimum hujuſce
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              Philoſophi ingenium, ex cauſis Mechanicis, materia ſcilicet &
                <lb/>
              motu, phænomena Naturæ ad vulgi etiam captum præclare de­
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              ducentis? </s>
              <s>Quis vero non ſubſannabit bonum illum
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              Galilæum,
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              qui
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              magno molimine Mathematico qualitates occultas, e Philoſophia
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              feliciter excluſas, denuo revocare ſuſtinuerit? </s>
              <s>Sed pudet nugis
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              diutius immorari. </s>
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          </chap>
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