Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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non autem in
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grãdioribus
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; conſtat enim experientia
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aquam, & cætera fluida naturam quamdam glutino
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ſam, & viſcoſam habere, quod quidem euincitur ex
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eo quod guttæ fluidæ ſuſpenſæ pendent è ſupremis
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ramis arborum, & ſi quis velit particulam eiuſdem
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guttæ à reliqua eius maſſa diuellere, perſentiet reſi
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ſtentiam aliquam, & ceſſante vi externa denuò gutta
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ſponte recolligitur; quòd verò prædicta operatio
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pendeat à glutine, conſtat ex eo, quòd ſi aquæ puriſ
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ſimæ addatur miſceaturque ſuccus, vel maſſa aliqua
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glutinoſa, & viſcoſa, tunc quidem guttulæ penden
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tes ampliores fiunt, in fila tenuiſſima ſatis longa ex
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tenduntur, atque in membranas graciliſſimas attenu
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antur quoties inſufflato aere efficiuntur bullæ
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, quas pueri efformare ſolent. </
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">Sic videmus
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ſaliuã
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viſcoſam, vel aquam cum albugine oui, vel ſaponi
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admixtam extendi in tenuiſſima fila, & denuò recol
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ligi, qui effectus procùl dubio illi viſcoſitati admix
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tæ tribui debet. </
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">Si igitur tam inſignis effectus pro
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ducitur à grandi copia glutinis, vel humor is viſcoſi,
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quis dubitabit eumdem effectum quando eſt minùs
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inſignis productum fuiſſe à minori copia eiuſdem̨
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glutinis, & viſcoſi humoris? </
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s.001728
">Sed nemo ferè dubitat
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in aqua, & in reliquis fluidis viſcoſitatem, aut quid
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analogum glutini in exiſtere, dubitatur ſolummodò
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de cauſa prædicti glutinis, cùm hæc poſſit eſſe exter
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na, & interna, duo enim corpora vniri poſſunt, & re
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ſiſtere ſeparationi, cùm à cauſa externa impelluntur
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vnum versùs aliud, vel potiùs ab aliqua vi motiua, </
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