Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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82
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<
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prout plenum, & principium materiale deficeret,
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aut abundaret in ipſis; & inſuper ait, quòd aſcenſus
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ſursùm aliquorum corporum, nempè ignis,
<
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nõ
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à prin
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cipio aliquo poſitiuo, ſcilicèt leuitate pendere an
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tiquì cenſebant, ſed effici huiuſmodi aſcenſum per
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extruſionem factam à fluidis corporibus ambienti
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bus ponderoſioribus. </
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<
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id
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">Si igitur hæc fuit antiquorum̨
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ſententia, quomodo eis tribui poteſt tàm enormis
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abſurditas, quòd nimirum vacuum moueatur, impel
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lat, habeat ſitum, & regionem ſursùm, versùs quam
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tendit? </
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<
s
id
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">quomodò, inquam, hæc affirmare poterant il
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li, qui apertè aìebant motus omnes naturales corpo
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rum elementarium tendere deorsùm omneſque pen
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dere ab vnico principio poſitiuo, ſcilicèt à pleno, &
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materia corporea? </
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<
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id
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">nec quia aer ſursùm impellitur,
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extruditurque, inde ſequitur, quòd vacua in aere
<
expan
abbr
="
cõ-tenta
">con
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tenta</
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moueantur, atque ſursùm aſcendant, nam ſi va
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cuum nil aliud eſt, quàm ſpatium, id erit immobile,
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& proindè aer ſecum non aſportabit vacuum ipſum
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ſursùm, ſed in ipſo aſcenſu ſucceſſiuè acquiret noua
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ſpatia: relinquendo præcedentia, quæ ſunt omninò
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immobilia. </
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<
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id
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">at ſi nomen vacui meram pleni priuatio
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nem, ac nihilum ſignificet, certum eſt quòd nihilum
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moueri non poteſt, nec impellere, nec ab vno ad
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alium locum migrare. </
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Ibidem.</
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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<
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">Poſtquam conſiderauimus Ariſtotelis argumenta
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contra Antiquos, qui leuitatem poſitiuam omninò
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negabant, reſtat modò vt eiuſdem Ariſtotelis ratio
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nes pro leuitatis ſtabilimento, & poſitione conſide-</
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