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

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1
viſu, ſed tactu, poſſum enim abſque noxa manum ad
latus flammæ approximare, vt ferè eam contingam,
non verò poſſum manum ſupra flammæ verticem iņ
notabili diſtantia vnius palmi abſque dolore, & v­
ſtione retinere, igitur dicendum eſt, quòd ſubſtan­
tia illa ignita vltra verticem flammæ redditur tranſ­
parens, & ideò inuiſibilis alia noua de cauſa efficitur.
Sed tamen negari non poteſt productio, & extenſio
ſubſtantiæ igneæ vltra flammam productæ, cùm hoc
ab ipſo tactu conuincatur.
Sed dices, quare ſupra flam­
verticem in multò maiori altitudine non ampliùs
tactu percipitur effluuium calidiſſimum eius, vt pro­
pè eius verticem percipiebatur?
At forſan hoc acci­
dit, quia ignea ſubſtantia fluidiſſima ab occurſu aeris
diſpergitur, & ſubdiuiditur in alias partes minores
ab inuicem diuiſas, & diſcretas, vt videmus aquæ
copiam è ſumma turri delapſam in progreſſu deſcen­
ſus ſubdiuidi in innumeras guttulas inter ſe diſcre­
tas, & ſicuti non æquè humectat, & madefacit pluuia
illa, ac maſſa integra aquæ vnita, quia nimirùm nul­
la pars ſubiecti corporis à maſſa continua aquæ tacta
relinquitur arida, cùm in pluuia non omnes partes ſo­
li madefiant humectentur que, ita propè verticem flam
ignis vnitus manum percutit, atque terebrat, cum
è contra in remotiori altitudine ſpicula illa ignea val­
dè diſcreta plagas exiguas, & inter ſe diſtantes iņ
ipſa manu inferant, & hinc minori noxa, minorique
dolore incurſus ignis tolerari poterit.

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