Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſinuari debet, & proindè aereæ particulæ, quæ poru
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los occupabant, expelli debent, & hæ cùm in fundo
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aquæ permanere nequeant, neceſsè eſt vt ſursùm per
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aquam aſcendant expreſsæ à maiori pondere ipſius
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aquæ; dum verò granula, ſeu ampullæ aereæ ſursùm
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feruntur, & ebullitionem quamdam oculis repręſen
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tant, fieri non poteſt, vt aqua per quam
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trãſeunt
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, ali
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quo pacto non agitetur commoueaturque tum expri
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mendo aerem, cùm etiam cedendo locum aeri tran
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ſituro. </
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<
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id
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">Habemus iam nouam cauſam agitationis, &
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commotionis ipſius aquæ præter priùs
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,
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dò</
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nimirùm aqua vi ſuæ grauitatis inſinuabatur intra
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ſpongiæ poros; nam præterea dum aerei globuli ex
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preſſi, & à pumice excluſi per aquam aſcendunt, ne
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ceſſariò aqua agitari quoque debet, igitur vniuerſa
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illa commotio, & veluti ebullitio aquæ habet
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causã
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efficientem, quæ eſt ſimplex aquæ grauitas, quarę
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non licèt inferre, quòd prędictus motus ebullitionis,
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qui in aqua poſt immerſionem pumicis conſpicitur,
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ſit ſignum, & euincat motum illum proprium eſſe ip
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ſius aquæ, & fluiditatem eius conſtituere. </
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Cap, 7. de
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natura flui
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ditatis.
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PROP. CL.
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Aquæ commotio à qua gleba diſſoluitur diſpergiturque per
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eam non eſt propria, & fluiditatis conſtitutiua, ſed
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producitur à grauitate fluidi.
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<
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inter pumicem, & glebam hoc diſcriminis inter-</
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