Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  LIBER
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                  SECUNDUS.</s>
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                <p type="main">
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                  DE
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                  MUNDI
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                  SYSTEMATE
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                  LIBER TERTIUS.
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                <p type="main">
                  <s>IN Libris præcedentibus principia Philoſophiæ tradidi, non ta­
                    <lb/>
                  men Philoſophica ſed Mathematica tantum, ex quibus vide­
                    <lb/>
                  licet in rebus Philoſophicis diſputari poſſit. </s>
                  <s>Hæc ſunt mo­
                    <lb/>
                  tuum & virium leges & conditiones, quæ ad Philoſophiam ma­
                    <lb/>
                  xime ſpectant. </s>
                  <s>Eadem tamen, ne ſterilia videantur, illuſtravi
                    <lb/>
                  Scholiis quibuſdam Philoſophicis, ea tractans quæ generalia ſunt,
                    <lb/>
                  & in quibus Philoſophia maxime fundari videtur, uti corporum
                    <lb/>
                  denſitatem & reſiſtentiam, ſpatia corporibus vacua, motumque
                    <lb/>
                  Lucis & Sonorum. </s>
                  <s>Supereſt ut ex iiſdem principiis doceamus con­
                    <lb/>
                  ſtitutionem Syſtematis Mundani. </s>
                  <s>De hoc argumento compoſue­
                    <lb/>
                  ram Librum tertium methodo populari, ut a pluribus legeretur. </s>
                  <s>
                    <lb/>
                  Sed quibus Principia poſita ſatis intellecta non fuerint, ii vim con­
                    <lb/>
                  ſequentiarum minime percipient, neque præjudicia deponent qui­
                    <lb/>
                  bus a multis retro annis inſueverunt: & propterea ne res in diſpu­
                    <lb/>
                  tationes trahatur, ſummam libri illius tranſtuli in Propoſitiones,
                    <lb/>
                  more Mathematico, ut ab iis ſolis legantur qui Principia prius
                    <lb/>
                  evolverint. </s>
                  <s>Veruntamen quoniam Propoſitiones ibi quam pluri­
                    <lb/>
                  mæ occurrant, quæ Lectoribus etiam Mathematice doctis moram
                    <lb/>
                  nimiam injicere poſſint, author eſſe nolo ut quiſquam eas omnes
                    <lb/>
                  evolvat; ſuffecerit ſiquis Definitiones, Leges motuum & ſectiones
                    <lb/>
                  tres priores Libri primi ſedulo legat, dein tranſeat ad hunc Li­
                    <lb/>
                  brum de Mundi Syſtemate, & reliquas Librorum priorum Propo­
                    <lb/>
                  ſitiones hic citatas pro lubitu conſulat. </s>
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