Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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bis milleſima ſpatij vacui ab eo occupati, hoc autem
videtur impoſſibile.
Cap. 12. dę
vacui neceſ­
ſitate.
PROP. CCLIX.
Ex ingenti ſpatio inani in particulis aeris contento non euin­
citur vacui imposſibilitas.
REſpondetur primò non eſſe neceſſarium vt vni­
uerſum ſpatium intra aeris particulas conten­
tum ſit prorsùs inane, poſſunt enim ibidem innume­
ræ particulæ corporeæ ramoſæ, & ſolutæ exiſtere, &
vagari, vt ſunt exhalationes aqueæ, terreæ, igneæ,
& innumeræ aliæ.
Secundò licèt prædictæ corporeæ particulæ, &
exhalationes in aere non adeſſent, non proinde eſ­
ſet impoſſibilis exceſſus ille ſpatij vacui ſupra plenam
aeris partem; nam, vt ſupra dictum eſt, valdè proba­
bile eſt aeris particulas habere figuram tubi, ſeu ſpi­
ræ ramoſæ, quæ nedùm bis milleſimum ſoliditatis,
ſed multò maius ſpatium comprehendere queant,
cuius rei non deſunt exempla in natura, ampullæ e­
nim aqueæ, quas pueri efformare ſolent incompara­
bile maius ſpatium cauum comprehendunt, quam̨
ſit ſolida aquæ pars. Idipſum in ampullis vitreis con­
tingit, igitur non videtur tam abſurda, & impoſſibi­
lis illa aeris figura, quæ poſſit prædictum grande ſpa­
tium continere; quare nil probat hoc argumentum̨
contra vacui poſitionem.
Ex his omnibus concludere licet rationes hacte­
nus excogitatas contra vacui poſitionem conuincen­
tes non eſſe. Reſtat modò vt directè oſtendamus ne-

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