Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670
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              currat in aqua, nihilominùs retrocedet reſpectu ſpa­
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              tij mundani, ſed curſu magis tardo, & lento, quàm̨
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              flumen mouetur. </s>
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              Cap. 4. poſi­
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              tiuam leui­
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              tatem noņ
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              dari.</s>
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              PROP. LXXXVII.
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              Alia ratione poſitiuam leuitatem non dari
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              oſtenditur.
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              <s id="s.000912">IT aque eodem modo in vaſe ABC aqua pleno, &
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              infernè perforato in B intelligantur demerſi glo­
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              buli aerei, ſed perpendiculariter imminentes ſuper
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              infimum foramen B, ſcilicèt intra cylindrum aqueum
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              DBE, qui ad modum fluminis intra
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              aquam vaſis repleti defluit egre­
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              diturque per foramen B. </s>
              <s id="s.000913">Et ſuppo­
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              namus maiori celeritate, ſcilicèt
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              dupla, aquam fluere à D vſque ad
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              B, quàm globus aereus G mouea­
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              tur ſur sùm translatus à naturali eius
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              leuitate, itaut, quando aqua prædi­
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              cti cylindri fluentis
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              ſpatium
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              GI debeat aereus globus G ſursùm impelli, &
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                ſigere</expan>
              ſpatium æquale IH ſubduplum ipſius GI, eo
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              quod medium fluidum in quo globus aereus G
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                dit</expan>
              non eſt ſtabile, ſed deorsùm defluit, non ſecùs ac
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              flumen, igitur quando aqua ſpatium GI tranſegerit,
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              globus aereus contrario curſu medietatem itineris
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              IH perficiet, qua proptèr ex hiſce duabus contrarijs
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              velocitatibus reſultabit tertia quędam celeritas, quæ </s>
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