Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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remus. </
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<
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">Præcipua eius ratio hæc eſt, quia reperiun
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tur duo loca contraria in natura ſursùm, & deorsùm,
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ſcilicèt circumferentia, & centrum mundi, ſeu ter
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ræ; & euidentèr apparet, quòd terra infima eſt, &
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ſubiacet omnibus alijs corporibus
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, demer
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gitur enìm deſcendendo infrà aerem, & infra
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,
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quouſque ad locum infimum perducatur, nempè ad
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centrum, quando nimirum ea non impeditur; hinc
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deducit, ergo terra eſt abſolutè, & ſimplicitèr gra
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uis, & non relatiuè. </
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<
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id
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">E contrà videmus aerem pene
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trare denſitatem ipſius aquæ, & aſcendere ſuper
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,
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& ignem perforare
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aquę, tùm aeris, per
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ducique ad ſupremam, & extremam ſuperficiem ae
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ris, veluti ad locum ſuum
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naturalẽ
">naturalem</
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ſupremum, vbi
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tandèm quieſcit, nec vlteriùs mouetur. </
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<
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id
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">Et quia, in
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quit, ignis omnibus ſupereminet, igitur eſt ſimpli
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citèr, & abſolutè leuis; terra omnibus ſubijcitur, igi
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tur eſt abſolutè grauis. </
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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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">Vt verò vim, & energiam Ariſtotelici ratiocinij
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percipiamus, & exactè perpendamus, oportet vt ſta
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tum controuerſiæ memoremus, ſcilicèt theſim Pla
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tonis, atque Democriti, quam Ariſtoteles redargue
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re profitetur, ante oculos ponamus, & poſtea argu
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mentum ab Ariſtotele adhibitum conſideremus. </
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<
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id
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">Et
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primò ratum perſpectumque eſt duplici modo fieri
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poſſe vt ignis ſursùm perducatur, & ſuper omnia e
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lementa emineat, aut nempè quia ignis ſponte ſuą
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mouetur ſursùm à principio intrinſeco, & naturali,
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ſcilicèt à leuitate, vel potiùs, quia ibidem ignis ex-</
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