Gassendi, Pierre, De motu impresso a motore translato epistulae duae, 1642

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              <s id="id.000433">
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              velociùs, quàm deorſum, cum ſurſum agatur geminæ
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              vi, & deorſum vna duntaxat? </s>
              <s id="id.000434">Nam opponi quidem
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              non poteſt reſiſtentia aëris, dum lapis ſurſum niti­
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              tur; ſimilis enim infernè fit, cum lapis prorumpit
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              deorſum. </s>
              <s id="id.000435">Accidit, quòd cadente quidem lapide, vi­
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              detur aër accurrere ad locum iam relictum poſſe; at
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              dum lapide quieſcente fulcrum ſuſtentans ſubducitur,
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              non eſt cur aër ſupernè accurrat; & cum accurrat po­
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              tius infernè, an non deberet lapis ſurſum, potiuſquam
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              deorſùm propelli? </s>
              <s id="id.000436">Dum etiam lapis projectus ſur­
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              ſum, punctum ſupremum attigit, in quo quædam eſt
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              veluti libratio, exæquatis momentis virium tam mo­
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              uentium, quàm reſiſtentium; an-non deberet lapis
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              in eo penitùs conquieſcere, vt non exſiſtente in aëre
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              cauſa, quæ lapidem magis adigat deorſùm, quàm,
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              ſurſum? </s>
              <s id="id.000437">Vt verum fatear, hæc difficultas videtur euin­
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              cere, aërem quidem eſſe poſſe cauſam aliquam ad­
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              juuantem, adaugentemque motus deorsùm velo­
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              citatem; at non eſſe tamen ſolam vel ſufficientem;
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              ſed exigi prætereà aliam, quæ lapidi faciat motus
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              deorſum initium, quæque reſiſtentiam aëris inferio­
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              ris vincat, vt cœptum ſemel motum aër ſuperior
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              promoueat, lapidem velut ſollicitans, & continuò
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              magis, magiſque inſtigans. </s>
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              <s id="id.000438">XII. </s>
              <s id="id.000439">Itaque præter cauſam impellentem, videtur
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              eſſe neceſſarium ad attrahentem recurrere, quæ id
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              muneris exſequatur. </s>
              <s id="id.000440">Cæterùm, hæc vis quænam
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              alia ſit, quàm quæ totius globi Telluris propria ſit,
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              & magnetica dici poſſit? </s>
              <s id="id.000441">Profecto cum globus tel­
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              luris totum quodpiam ſit, notum eſt nullum eſſe </s>
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