Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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              niſi per hanc Regulam de rerum univerſarum natura judica­
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              mus. </s>
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              <s>Jam cum Gravia ſint omnia corpora, quæ apud Terram vel in
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              Cælis reperiuntur, de quibus Experimenta vel Obſervationes in­
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              ſtituere licet; omnino dicendum erit, Gravitatem corporibus uNI­
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              verſis competere. </s>
              <s>Et quemadmodum nulla concipi debent cor­
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              pora, quæ non ſint Extenſa, Mobilia, & Impenetrabilia; ita nulla
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              concipi debere, quæ non ſint Gravia. </s>
              <s>Corporum Extenſio, Mobi­
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              litas, & Impenetrabilitas non niſi per Experimenta innoteſcunt:
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              eodem plane modo Gravitas innoteſcit. </s>
              <s>Corpora omnia de qui­
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              bus Obſervationes habemus, Extenſa ſunt & Mobilia & Impene­
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              trabilia: & inde concludimus corpora univerſa, etiam illa de qui­
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              bus Obſervationes non habemus, Extenſa eſſe & Mobilia & Im­
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              penetrabilia. </s>
              <s>Ita corpora omnia ſunt Gravia, de quibus Obſer­
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              vationes habemus: & inde concludimus corpora univerſa, etiam
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              illa de quibus Obſervationes non habemus, Gravia eſſe. </s>
              <s>Si quis
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              dicat corpora Stellarum inerrantium non eſſe Gravia, quandoqui­
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              dem eorum Gravitas nondum eſt obſervata; eodem argumento
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              dicere licebit neque Extenſa eſſe, nec Mobilia, nec Impenetrabilia,
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              cum hæ Fixarum affectiones nondum ſint obſervatæ. </s>
              <s>Quid opus
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              eſt verbis? </s>
              <s>Inter primarias qualitates corporum univerſorum vel
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              Gravitas habebit locum; vel Extenſio, Mobilitas, & Impenetra­
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              bilitas non habebunt. </s>
              <s>Et natura rerum vel recte explicabitur
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              per corporum Gravitatem, vel non recte explicabitur per corpo­
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              rum Extenſionem, Mobilitatem, & Impenetrabilitatem. </s>
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              <s>Audio nonnullos hanc improbare concluſionem, & de occultis
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              qualitatibus neſcio quid muſſitare. </s>
              <s>Gravitatem ſcilicet Occultum
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              eſſe quid, perpetuo argutari ſolent; occultas vero cauſas pro­
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              cul eſſe ablegandas a Philoſophia. </s>
              <s>His autem facile reſpon­
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              detur; occultas eſſe cauſas, non illas quidem quarum exiſtentia
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              per Obſervationes clariſſime demonſtratur, ſed has ſolum quarum
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              occulta eſt & ficta exiſtentia nondum vero comprobata. </s>
              <s>Gravitas
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              ergo non erit occulta cauſa motuum cæleſtium; ſiquidem ex Phæ­
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              nomenis oſtenſum eſt, hanc virtutem revera exiſtere. </s>
              <s>Hi potius
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              ad occultas confugiunt cauſas; qui neſcio quos Vortices, materiæ
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              cujuſdam prorſus fictitiæ & ſenſibus omnino ignotæ, motibus
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              iiſdem regendis præficiunt. </s>
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              <s>Ideone autem Gravitas occulta cauſa dicetur, eoque nomine
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              rejicietur e Philoſophia, quod cauſa ipſius Gravitatis occulta eſt
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              & nondum inventa? </s>
              <s>Qui ſic ſtatuunt, videant nequid ſtatu­</s>
            </p>
          </chap>
        </body>
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