Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  DE MOTU
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                  CORPORUM</s>
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                <p type="main">
                  <s>
                    <emph type="italics"/>
                  Corol.
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                  5. Et ſi Globi moveantur in Mediis diverſis; ſpatium in
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                  Medio, quod cæteris paribus magis reſiſtit, diminuendum erit in
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                  ratione majoris reſiſtentiæ. </s>
                  <s>Tempus enim (per hanc Propoſitio­
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                  nem) diminuetur in ratione reſiſtentiæ auctæ, & ſpatium in ra­
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                  tione temporis. </s>
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                  LEMMA II.
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                  Momentum Genitæ æquatur Momentis laterum ſingulorum gene­
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                  rantium in eorundem laterum indices dignitatum & coefficien­
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                  tia continue ductis.
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                  <s>Genitam voco quantitatem omnem quæ ex lateribus vel termi­
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                  nis quibuſcunque, in Arithmetica per multiplicationem, diviſionem,
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                  & extractionem radicum; in Geometria per inventionem vel con­
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                  tentorum & laterum, vel extremarum & mediarum proportionalium,
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                  abſque additione & ſubductione generatur. </s>
                  <s>Ejuſmodi quantita­
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                  tes ſunt Facti, Quoti, Radices, Rectangula, Quadrata, Cubi, Latera
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                  quadrata, Latera cubica, & ſimiles. </s>
                  <s>Has quantitates ut indeterminatas
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                  & inſtabiles, & quaſi motu fluxuve perpetuo creſcentes vel decre­
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                  ſcentes, hic conſidero; & earum incrementa vel decrementa momen­
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                  tanea ſub nomine Momentorum intelligo: ita ut incrementa pro
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                  momentis addititiis ſeu affirmativis, ac decrementa pro ſubductitiis
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                  ſeu negativis habeantur. </s>
                  <s>Cave tamen intellexeris particulas fiNI­
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                  tas. </s>
                  <s>Particulæ finitæ non ſunt momenta, ſed quantitates ipſæ ex
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                  momentis genitæ. </s>
                  <s>Intelligenda ſunt principia jamjam naſcentia fi­
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                  nitarum magnitudinum. </s>
                  <s>Neque enim ſpectatur in hoc Lemmate
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                  magnitudo momentorum, ſed prima naſcentium proportio. </s>
                  <s>Eo­
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                  dem recidit ſi loco momentorum uſurpentur vel velocitates incre­
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                  mentorum ac decrementorum, (quas etiam motus, mutationes
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                  & fluxiones quantitatum nominare licet) vel finitæ quævis quanti­
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                  tates velocitatibus hiſce proportionales. </s>
                  <s>Lateris autem cujuſque
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                  generantis Coefficiens eſt quantitas, quæ oritur applicando GeNI­
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                  tam ad hoc latus. </s>
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                  <s>Igitur ſenſus Lemmatis eſt, ut, ſi quantitatum quarumcunque
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                  perpetuo motu creſcentium vel decreſcentium A, B, C, &c. </s>
                  <s>mo­
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                  menta, vel mutationum velocitates dicantur
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                  a, b, c,
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                  &c. </s>
                  <s>momentum
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                  vel mutatio geniti rectanguli AB fuerit
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                  a
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                  B+
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                  b
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                  A, & geniti con­
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                  tenti ABC momentum fuerit
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                  a
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                  BC+
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                  b
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                  AC+
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                  c
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                  AB: & genitarum </s>
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