Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627
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              namque graue quodlibet quieſcendo, corpori cui adiacet
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              adhæret, ac perpetua quadam preſſione deorſum mundi
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              centrum iugiter petit. </s>
              <s id="N17399">Quapropter dum aliò transferri con­
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              tigerit, reſiſtit quaſi per contrarium motum. </s>
              <s id="N1739E">Vice autem
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              verſa cum iam moueri cœperit per impulſum tunc acce­
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              ptum, non modò adhuc refrænatur grauitas,
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              ef­
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              fectus preſsionis illius qua tendit deorſum, ſed iam graue
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              ipſum ad vlteriorem motum progreſsionis reperitur diſpo­
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              ſitum, vt adueniente nouo impetu quaſi duplicato principio
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              transferatur. </s>
              <s id="N173B1">Imo ipſa quoque grauitas in corpore agita­
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              to ſi ex parte illud tendat deorſum, vt in decliue vrget quo
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              verſum graue proijcitur, ita vt vis quæ merè deorſum ten­
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              debat, in vim quæ aliò transfert per accidens refundatur.
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              <s id="N173BB">Facilius ergo deinceps fertur graue proximè commotum
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              quàm cum primò quietem relinquit: quia mouetur ad no­
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              uum ipſum impulſum ſimul cum reliquijs impetus prius im­
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              preſsi, quo adhuc grauitas compeſcitur, ac moderatur ne
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              progreſsioni obſiſtat, ſed potius ad illam
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              per ac­
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              cidens conferat, at que concurrat. </s>
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              <s id="N173CE">Quod autem dictum eſt de motione, & commotione
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              violenta idipſum, vel quid ſimile communiter obſeruatur in
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              motione naturali grauium deorſum, ac leuium ſurſum; vt
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              ſcilicet hæc corpora facilius, ac velocius moueantur in pro­
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              greſſu poſtquam commota iam fuerint, quàm in principio
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              quando tunc ſe mouere incipiunt; imò tanto facilius ac ve­
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              locius, quantò magis à principio motus diſceſſerint. </s>
              <s id="N173DD">Sed
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              qua ratione id eueniat, diuerſo exiſtente principio motus
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              naturalis à principio motus violenti, non conuenit inter Phi­
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              loſophos, qui propterea in varias, ac diſcrepantes abierunt
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              ſententias. </s>
              <s id="N173E8">Inter quas ea videtur aliqua cum probabilitate
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              percrebuiſſe, quæ totam hanc maiorem facilitatem, ac velo­
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              citatem, refert ad medium per quod mobile tranſit: non
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              ſolum ob minorem eius reſiſtentiam, quæ reperitur in pro­
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              greſſu, ac prope finem, ſed præcipuè propter accurſum eiuſ­
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              dem poſt terga ipſius mobilis ad replendum vacuum, quod
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              relinquit. </s>
              <s id="N173F7">Nam is cum celerrimè fiat, impingere videtur in </s>
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