Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſed etiam nullius roboris, quia licet in motu circu
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lari Rotæ ſolidæ
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appareat neceſſitas vacui, nihilo
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minus præcipua difficultas eſt non de motu circula
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ri, ſed de motu directo, vel per lineas curuas irregu
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lares in fluido, in quo ſenſu non conſtat, neque de
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monſtratur partes fluidi excurrere intra alias poſſe,
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abſque eo quod mutuò ſe ſe confricent, inuertantur,
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& inter ſe innumeras exiguas vacuitates admittant.
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</
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<
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id
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">imò in poſtrema parte huius capitis oſtendemus ne
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ceſſariam eſſe vacui admiſſionem, ad hoc, vt fluidum,
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vel
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dẽſum
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corpus per fluidum moueri queat; ſed mo
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dò ſatis eſt oſtendiſſe non eſſe euidens, nec demon
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ſtratum fuiſſe, quod in motu facto in fluidis vacuum
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neceſſario non exigatur. </
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Cap. 12. dę
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vacui neceſ
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ſitate.</
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">Secundò,
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Vacuum non eſt cauſa motus, ſed Natura, ergo
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vacuum non datur.
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"> Cui reſponderi poteſt, neminem,
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niſi planè delirum, ac ſtolidum, ſomniaſſe
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vacuũ
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, ſci
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licèt nihilum, cauſam poſitiuam
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efficiẽtem
">efficientem</
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motus eſ
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ſe. </
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<
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">Dixerunt certè Antiqui motum produci à natura,
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ſiue à qualibet cauſa externa impulſiua, ſed requiri
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vacuum veluti locus in quo motus fieri poſſit, igitur
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Ariſtotelis
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argumẽtum
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nil officit vacui aſſertoribus. </
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<
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">Tertiò ait: quod
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accidit dicentibus vacuum eſſe neceſ-
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ſarium, vt motus ſit contrarium potiùs, nam dato vacuo nil
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in eo moueri poſſet, quia non eſt quo magis, aut minus mouea
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tur, quod namque vacuum eſt, caret omni differentia
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, ſcili
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cèt non habet ſursùm, neque deorsùm, nec ante, nec
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retro, &c. </
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<
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">Cui reſponderi poteſt, quod motus, quate
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nus talis eſt, dicit ſolummodò migrationem, & tran-</
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