Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  DE MUNDI
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                  SYSTEMATE</s>
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                  <s>
                    <emph type="italics"/>
                  Corol.
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                  2. Corpora univerſa quæ circa Terram ſunt, gravia ſunt
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                  in Terram; & pondera omnium, quæ æqualiter à centro Terræ
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                  diſtant, ſunt ut quantitates materiæ in iiſdem. </s>
                  <s>Hæc eſt qualitas
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                  omnium in quibus experimenta inſtituere licet, & propterea per
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                  Reg.111. de univerſis affirmanda eſt. </s>
                  <s>Si Æther aut corpus aliud
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                  quodcunque vel gravitate omnino deſtitueretur, vel pro quantitate
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                  materiæ ſuæ minus gravitaret: quoniam id (ex mente
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                  Ariſtotelis,
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                  Carteſii & aliorum
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                  non differet ab aliis corporibus niſi in forma
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                  materiæ, poſſet idem per mutationem formæ gradatim tranſmutari
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                  in corpus ejuſdem conditionis cum iis quæ, pro quantitate materiæ,
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                  quam maxime gravitant, & viciſſim corpora maxime gravia, fer­
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                  mam illius gradatim induendo, poſſent gravitatem ſuam gradatim
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                  amittere. </s>
                  <s>Ac proinde pondera penderent à formis corporum,
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                  poſſentque cum formis variari, contra quam probatum eſt in
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                  Corollario ſuperiore.
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                  Corol.
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                  3. Spatia omnia non ſunt æqualiter plena. </s>
                  <s>Nam ſi ſpatia
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                  omnia æqualiter plena eſſent, gravitas ſpecifica fluidi quo regio
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                  aeris impleretur, ob ſummam denſitatem materiæ, nil cederet gra­
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                  vitati ſpecificæ argenti vivi, vel auri, vel corporis alterius cujuſ­
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                  cunQ.E.D.nſiſſimi; & propterea nec aurum neque aliud quod­
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                  cunque corpus in aere deſcendere poſſet. </s>
                  <s>Nam corpora in flui­
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                  dis, niſi ſpecifice graviora ſint, minime deſcendunt. </s>
                  <s>Quod ſi
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                  quantitas materiæ in ſpatio dato per rarefactionem quamcunque
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                  diminui poſſit, quidni diminui poſſit in infinitum?
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                  </s>
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                <p type="main">
                  <s>
                    <emph type="italics"/>
                  Corol.
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                  4. Si omnes omnium corporum particulæ ſolidæ ſint ejuſ­
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                  dem denſitatis, neque abſque poris rarefieri poſſint, Vacuum da­
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                  tur. </s>
                  <s>Ejuſdem denſitatis eſſe dico, quarum vires inertiæ ſunt ut
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                  magnitudines.
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                  </s>
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                  <s>
                    <emph type="italics"/>
                  Corol.
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                  5. Vis gravitatis diverſi eſt generis à vi magnetica. </s>
                  <s>Nam
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                  attractio magnetica non eſt ut materia attracta. </s>
                  <s>Corpora aliqua
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                  magis trahuntur, alia minus, plurima non trahuntur. </s>
                  <s>Et vis mag­
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                  netica in uno & eodem corpore intendi poteſt & remitti, eſtque
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                  nonnunquam longe major pro quantitate materiæ quam vis gra­
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                  vitatis, & in receſſu à Magnete decreſcit in ratione diſtantiæ non
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                  duplicata, ſed fere triplicata, quantum ex craſſis quibuſdam obſer­
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                  vationibus animadvertere potui.
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                  </s>
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