Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  <s>
                    <pb xlink:href="039/01/504.jpg" pagenum="473"/>
                  riorem latior ſit quam juxta caput Cometæ. </s>
                  <s>Ea autem rarefacti­
                    <lb/>
                    <arrow.to.target n="note502"/>
                  one vaporem perpetuo dilatatum diffundi tandem & ſpargi per
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                  cœlos univerſos, deinde paulatim in Planetas per gravitatem ſuam
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                  attrahi & cum eorum Atmoſphæris miſceri, rationi conſentaneum
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                  videtur. </s>
                  <s>Nam quemadmodum Maria ad conſtitutionem Terræ
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                  hujus omnino requiruntur, idque ut ex iis per calorem Solis va­
                    <lb/>
                  pores copioſe ſatis excitentur, qui vel in nubes coacti decidant
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                  in pluviis, & terram omnem ad procreationem vegetabilium irri­
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                  gent & nutriant; vel in frigidis montium verticibus condenſati
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                  (ut aliqui cum ratione philoſophantur) decurrant in fontes &
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                  flumina ſic ad conſervationem marium & humorum in Planetis,
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                  requiri videntur Cometæ, ex quorum exhalationibus & vapori­
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                  bus condenſatis, quicquid liquoris per vegetationem & putre­
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                  factionem conſumitur & in terram aridam convertitur, continuo
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                  ſuppleri & refici poſſit. </s>
                  <s>Nam vegetabilia omnia ex liquoribus
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                  omnino creſcunt, dein magna ex parte in terram aridam per pu­
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                  trefactionem abeunt, & limus ex liquoribus putrefactis perpetuo
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                  decidit. </s>
                  <s>Hinc moles Terræ aridæ indies augetur, & liquores, niſi
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                  aliunde augmentum ſumerent, perpetuo decreſcere deberent, ac
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                  tandem deficere. </s>
                  <s>Porro ſuſpicor Spiritum illum, qui Aeris noſtri
                    <lb/>
                  pars minima eſt ſed ſubtiliſſima & optima, & ad rerum omnium
                    <lb/>
                  vitam requiritur, ex Cometis præcipue venire. </s>
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                  <s>
                    <margin.target id="note502"/>
                  LIBER
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                  TERTIUS.</s>
                </p>
                <p type="main">
                  <s>Atmoſphæræ Cometarum in deſcenſu eorum in Solem, excur­
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                  rendo in caudas, diminuuntur, & (ea certe in parte quæ Solem
                    <lb/>
                  reſpicit) anguſtiores redduntur: & viciſſim in receſſu eorum a
                    <lb/>
                  Sole, ubi jam minus excurrunt in caudas, ampliantur; ſi modo
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                  Phænomena eorum
                    <emph type="italics"/>
                  Hevelius
                    <emph.end type="italics"/>
                  recte notavit. </s>
                  <s>Minimæ autem ap­
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                  parent ubi capita jam modo ad Solem calefacta in caudas maximas
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                  & fulgentiſſimas abiere, & nuclei fumo forſan craſſiore & nigriore
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                  in Atmoſphærarum partibus infimis circundantur. </s>
                  <s>Nam fumus
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                  omnis ingenti calore excitatus, craſſior & nigrior eſſe ſolet. </s>
                  <s>Sic
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                  caput Cometæ de quo egimus, in æqualibus a Sole ac Terra di­
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                  ſtantiis, obſcurius apparuit poſt Perihelium ſuum quam antea. </s>
                  <s>
                    <lb/>
                  Menſe enim
                    <emph type="italics"/>
                  Decembri
                    <emph.end type="italics"/>
                  cum ſtellis tertiæ magnitudinis conferri ſole­
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                  bat, at Menſe
                    <emph type="italics"/>
                  Novembri
                    <emph.end type="italics"/>
                  cum ſtellis primæ & ſecundæ. </s>
                  <s>Et qui
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                  utrumque viderant, majorem deſcribunt Cometam priorem. </s>
                  <s>Nam
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                  Juveni cuidam
                    <emph type="italics"/>
                  Cantabrigienſi, Novemb.
                    <emph.end type="italics"/>
                  19, Cometa hicce luce ſua
                    <lb/>
                  quantumvis plumbea & obtuſa, æquabat Spicam Virginis, & cla­
                    <lb/>
                  rius micabat quam poſtea. </s>
                  <s>Et
                    <emph type="italics"/>
                  D. Storer
                    <emph.end type="italics"/>
                  literis quæ in manus no­
                    <lb/>
                  ſtras incidere, ſcripſit caput ejus Menſe
                    <emph type="italics"/>
                  Decembri,
                    <emph.end type="italics"/>
                  ubi caudam </s>
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