Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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      <text>
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                <p type="main">
                  <s>
                    <pb xlink:href="039/01/503.jpg" pagenum="472"/>
                    <arrow.to.target n="note501"/>
                  dere. </s>
                  <s>Cum autem gravitas corporum terreſtrium ſit ut materia
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                  in corporibus, ideoque ſervata quantitate materiæ intendi & re­
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                  mitti nequeat, ſuſpicor aſcenſum illum ex rarefactione materiæ
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                  caudarum potius oriri. </s>
                  <s>Aſcendit fumus in camino impulſu Aeris
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                  cui innatat. </s>
                  <s>Aer ille per calorem rarefactus aſcendit, ob diminu­
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                  tam ſuam gravitatem ſpecificam, & fumum implicatum rapit ſe­
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                  cum. </s>
                  <s>Quidni cauda Cometæ ad eundem modum aſcenderit a
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                  Sole? </s>
                  <s>Nam radii Solares non agitant Media quæ permeant, niſi
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                  in reflexione & refractione. </s>
                  <s>Particulæ reflectentes ea actione cale­
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                  factæ calefacient auram ætheream cui implicantur. </s>
                  <s>Illa calore ſibi
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                  communicato rarefiet, & ob diminutam ea raritate gravitatem
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                  ſuam ſpecificam qua prius tendebat in Solem, aſcendet & ſecum
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                  rapiet particulas reflectentes ex quibus cauda componitur: Ad
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                  aſcenſum vaporum conducit etiam quod hi gyrantur circa Solem
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                  & ea actione conantur a Sole recedere, at Solis Atmoſphæra &
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                  materia cœlorum vel plane quieſcit, vel motu ſolo quem a Solis
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                  rotatione acceperint, tardius gyratur. </s>
                  <s>Hæ ſunt cauſæ aſcenſus
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                  caudarum in vicinia Solis, ubi Orbes curviores ſunt, & Cometæ
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                  intra denſiorem & ea ratione graviorem Solis Atmoſphæram con­
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                  ſiſtunt, & caudas quam longiſſimas mox emittunt. </s>
                  <s>Nam caudæ
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                  quæ tunc naſcuntur, conſervando motum ſuum & interea verſus
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                  Solem gravitando, movebuntur circa Solem in Ellipſibus pro
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                  more capitum, & per motum illum capita ſemper comitabuntur
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                  & iis liberrime adhærebunt. </s>
                  <s>Gravitas enim vaporum in Solem
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                  non magis efficiet ut caudæ poſtea decidant a capitibus Solem ver­
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                  ſus, quam gravitas capitum efficere poſſit ut hæc decidant a cau­
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                  dis. </s>
                  <s>Communi gravitate vel ſimul in Solem cadunt, vel ſimul in
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                  aſcenſu ſuo retardabuntur; adeoque gravitas illa non impedit,
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                  quo minus caudæ & capita poſitionem quamcunque ad invicem a
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                  cauſis jam deſcriptis, aut aliis quibuſcunque, facillime accipiant &
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                  poſtea liberrime ſervent. </s>
                </p>
                <p type="margin">
                  <s>
                    <margin.target id="note501"/>
                  DE MUNDI
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                  SYSTEMATE</s>
                </p>
                <p type="main">
                  <s>Caudæ igitur quæ in Cometarum Periheliis naſcuntur, in regi­
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                  ones longinquas cum eorum capitibus abibunt, & vel inde poſt
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                  longam annorum ſeriem cum iiſdem ad nos redibunt, vel potius
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                  ibi rarefactæ paulatim evaneſcent. </s>
                  <s>Nam poſtea in deſcenſu capi­
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                  tum ad Solem caudæ novæ breviuſculæ lento motu a capitibus
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                  propagari debebunt, & ſubinde, in Periheliis Cometarum illorum
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                  qui aduſque Atmoſphæram Solis deſcendunt, in immenſum au­
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                  geri. </s>
                  <s>Vapor enim in ſpatiis illis liberrimis perpetuo rareſcit ac
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                  dilatatur. </s>
                  <s>Qua ratione fit ut cauda omnis ad extremitatem ſupe-</s>
                </p>
              </subchap2>
            </subchap1>
          </chap>
        </body>
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    </archimedes>
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