Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  LIBER
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                  PRIMUS.</s>
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                  PROPOSITIO LXXXVI. THEOREMA XLIII.
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                  Si particularum, ex quibus corpus attractivum componitur, vires
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                  in receſſu corporis attracti decreſcunt in triplicata vel pluſquam
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                  triplicata ratione diſtantiarum a particulis: attractio longe for­
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                  tior erit in contactu, quam cum attrahens & attractum inter­
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                  vallo vel minimo ſeparantur ab invicem.
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                  <s>Nam attractionem in acceſſu attracti corpuſculi ad hujuſmodi
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                  Sphæram trahentem augeri in infinitum, conſtat per ſolutionem Pro­
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                  blematis XLI, in Exemplo ſecundo ac tertio exhibitam. </s>
                  <s>Idem, per
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                  Exempla illa & Theorema XLI inter ſe collata, facile colligitur
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                  de attractionibus corporum verſus Orbes concavo-convexos, ſive
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                  corpora attracta collocentur extra Orbes, ſive intra in eorum cavi­
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                  tatibus. </s>
                  <s>Sed & addendo vel auferendo his Sphæris & Orbibus ubi­
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                  vis extra locum contactus materiam quamlibet attractivam, eo ut
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                  corpora attractiva induant figuram quamvis aſſignatam, conſtabit
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                  Propoſitio de corporibus univerſis.
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                    <expan abbr="q.">que</expan>
                  E. D.
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                  PROPOSITIO LXXXVII. THEOREMA XLIV.
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                  Si corpora duo ſibi invicem ſimilia, & ex materia æqualiter attra­
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                  ctiva conſtantia, ſeorſim attrahant corpuſcula ſibi ipſis proporti­
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                  onalia & ad ſe ſimiliter poſita: attractiones acceleratrices cor­
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                  puſculorum in corpora tota erunt ut attractiones acceleratrices
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                  corpuſculorum in eorum particulas totis proportionales & in to­
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                  tis ſimiliter poſitas.
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                  <s>Nam ſi corpora diſtinguantur in particulas, quæ ſint totis pro­
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                  portionales & in totis ſimiliter ſitæ; erit, ut attractio in particulam
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                  quamlibet unius corporis ad attractionem in particulam correſpon­
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                  dentem in corpore altero, ita attractiones in particulas ſingulas
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                  primi corporis ad attractiones in alterius particulas ſingulas correſ­
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                  pondentes; & componendo, ita attractio in totum primum corpus
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                  ad attractionem in totum ſecundum.
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                    <expan abbr="q.">que</expan>
                  E. D.
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                  Corol.
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                  1. Ergo ſi vires attractivæ particularum, augendo diſtan­
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                  tias corpuſculorum attractorum, decreſcant in ratione dignitatis </s>
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