Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  REGULÆ
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                  PHILOSOPHANDI.
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                  REGULA I.
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                  Cauſas rerum naturalium non plures admitti debere, quam quæ
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                  & veræ ſint & earum Phænomenis explicandis ſufficiant.
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                  <s>DIcunt utique Philoſophi: Natura nihil agit fruſtra, & fruſtra
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                  fit per plura quod fieri poteſt per pauciora. </s>
                  <s>Natura enim
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                  ſimplex eſt & rerum cauſis ſuperfluis non luxuriat. </s>
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                  REGULA II.
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                  Ideoque Effectuum naturalium ejuſdem generis eædem ſunt
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                  Cauſæ.
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                  <s>Uti reſpirationis in Homine & in Beſtia; deſcenſus lapidum in
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                  Europa
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                  & in
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                  America
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                  ; Lucis in Igne culinari & in Sole; reflexi­
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                  onis Lucis in Terra & in Planetis. </s>
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                  REGULA III.
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                  Qualitates corporum quæ intendi & remitti nequeunt, quæque
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                  corporibus omnibus competunt in quibus experimenta inſtituere
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                  licet, pro qualitatibus corporum univerſorum habendæ ſunt.
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                  <s>Nam qualitates corporum non niſi per experimenta innoteſcunt;
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                  ideoque generales ſtatuendæ ſunt quotquot cum experimentis ge­
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                  neraliter quadrant; & quæ minui non poſſunt, non poſſunt au­
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                  ferri. </s>
                  <s>Certe contra experimentorum tenorem ſomnia temere con­
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                  fingenda non ſunt, nec a Naturæ ana logia recedendum eſt, cum </s>
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