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

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1 tate, & multiplicitate cauſarum quando ſuos effe­
ctus producere poteſt via illa breuiori, & faciliori.
hinc deducitur, quod ſi poſſibile eſt tranſportare cor­
pora naturalia ad propria loca mediante vnica, & ſin­
gulari motiua virtute grauitatis, vaniſſimè, & ſtultè
natura ageret, ſi niteretur prædictum finem aſſe qui
adhibitis duobus principijs ſcilicèt grauitate, & al­
tera oppoſita virtute, quæ leuitas nuncupatur.
Quod
verò poſſint naturalia corpora ad ſua naturalia loca
perduci à grauitate ſola abſque leuitate patet ex ſu­
periùs dictis, nam minor grauitas, quæ veſicæ aerę
plenæ tribuitur, & maior aquæ, & omnium maxima
hydrargyro, ſufficientiſſima cauſa eſt apta ad produ­
cendum prædictum effectum, quod deducitur ex prin­

cipijs, & rationibus mechanicis.
Quaproptèr pro­
babiliſſimè concedendum eſt ſolo principio grauita­
tis abſque vlla leuitate naturam ſuum finem aſſequi
collocandi corpora terrena in debitis locis, nempè
ſursùm, & deorsùm.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
Cap. 2.
Et hactenùs adductæ ſunt rationes probabiles con­
tra
poſitiuam leuitatem, reſtat modò vt idipſum di­
rectè oſtendatur rationibus magis conuincentibus,
& efficacioribus.

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