Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              grauem eſſe, niſi tantùm de illo, quem ſpiramus, in quo ambulamus, qui
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              nos ambit: </s>
              <s id="N18335">adde quod Ariſtoteles l.4.
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              de Cœlo, c.
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              5.
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              t.
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              36. tribuit aëri gra­
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              uitatem his verbis;
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              quapropter
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              inquit,
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              aër, & aqua habent & leuitatem, &
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              grauitatem.
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              Theorema
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              84.
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              Medium eiuſdem grauitatis cum dato corpore graui detrahit totam eius
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              grauitationem ſingularem; </s>
              <s id="N1836C">hoc eſt corpus graue in medium æquè graue non
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              grauitat
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              ; </s>
              <s id="N18375">quia ſi grauitaret deſcenderet; </s>
              <s id="N18379">ſic pars aquæ in aliam partem
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              aquæ non grauitat, & ſi aqua ponderetur in aqua, nullius ponderis eſt; </s>
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              cum enim nulla ſit ratio cur vna ſit infrà potiùs, quàm alia, vna certè al­
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              terius locum non ambit; igitur caret grauitatione ſingulari. </s>
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              Theorema
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              85.
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              </s>
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            <p id="N18394" type="main">
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              Medium graue detrahit aliquid de ſingulari grauitatione corporis grauio­
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              ris
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              ; </s>
              <s id="N183A1">certa eſt hypotheſis; </s>
              <s id="N183A5">nec enim plumbum eſt eius ponderis ſingula­
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              ris in aqua, cuius eſt in aëre; dixi ſingularis; </s>
              <s id="N183AB">nam ſi plumbum & ipſa
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              aqua ſimul appendantur, haud dubiè totum habebis pondus plumbi, &
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              totum pondus aquæ; </s>
              <s id="N183B3">ratio verò huius effectus non eſt huius loci; </s>
              <s id="N183B7">quid­
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              quid ſit, ſi æqualis grauitas medij tollit totam æqualem alterius corpo­
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              ris; certè maiorem alterius corporis totam non tollit per Th. 80. ſed
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              tantùm aliquid illius, quod quomodo fiat, dicemus Tomo quinto cum de
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              graui, & leui. </s>
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              Theorema
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              86.
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              </s>
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              Medium graue detrahit eam partem grauitationis corporis grauioris, quæ
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              eſt æqualis ſuæ grauitationi.
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              v. g. ſi medij grauitas eſt ſubdupla, detrahit
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              ſubduplum grauitationis; </s>
              <s id="N183E4">ſi ſubdecupla, ſubdecuplum, atque ita dein­
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              ceps; hoc iam olim ſuppoſuit magnus Archim. </s>
              <s id="N183EB">ſupponunt etiam reliqui
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              omnes, præſertim recentior Galileus; </s>
              <s id="N183F1">ſi enim æqualis ſuperat æqualem,
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              ergo inæqualis pro rata; ſcilicet ſubdupla ſubduplum ſubtripla, &c. </s>
              <s id="N183F7">Præ­
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              terea, cum detrahat aliquam partem grauitationis maioris per Th.85.nec
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              detrahat inæqualem maiorem, per Th.80.nec inæqualem minorem; cur
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              enim potius vnam minorem quam aliam? </s>
              <s id="N18401">certè æqualem tantùm
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              detrahere poteſt, quod ſuo loco per Principium poſitiuum demonſtra­
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              bimus. </s>
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              Theorema
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              87.
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              </s>
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              Hinc ratio cur grauia deſcendant tardius in aqua, quàm in aëre, & in
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              aëre, quàm in vacuo
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              ; </s>
              <s id="N18423">hinc etiam maioris ſunt ponderis in aëre quam in
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              aqua; </s>
              <s id="N18429">hinc ſi grauitas alicuius corporis ſit ad grauitatem aëris vt 100.
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              ad 1. haud dubiè decreſcet eius pondus in aëre (1/100); </s>
              <s id="N1842F">id eſt, ſi penderet 100.
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              libras in vacuo, in aëre penderet 99. & eo tempore quo in vacuo decur­
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              reret 100. paſſus, in aëre decurreret 99. ſi nulla ſit aliunde reſiſtentia,
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              qualis reuerâ eſt, vt dicam infrà; </s>
              <s id="N18439">ſimiliter ſi grauitas alicuius corporis
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              ſit ad grauitatem aquæ, vt 10. ad 1. decreſcet eius pondus in aqua (1/10), &
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              eo tempore quo decurreret in vacuo 10. palmos ſpatij, in aqua decurre </s>
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