Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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

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Cap. 4. poſi-
tiuam leui-
tatem noņ
dari.

PROP. LXIV.

Fumi structura, & compoſitio declaratur.

COnſtat fumum eſſe maſſam copioſam particula-
rum exiguarum olei, terræ, & aquæ, quæ par-
ticulæ ab inuicem diſcretæ, & ſeparatæ nondùm̨
accenſæ ſunt, licèt valdè excalefactæ ſint. hoc planè
confirmatur ab operatione chymica, poſſunt enim̨
recolligi ex fumo partes aqueæ ſegregatæ, & diſcre-
tæ à partibus vnctuoſis, & ſulphureis, nec non à
particulis terreis, & fuliginoſis, & viciſſim quæli-
bet ex prædictis ſubſtantijs recuperari poteſt ſepa-
rata à reliquis; præterea conſtat ſenſu, fumum noņ
eſſe corpus continuum, ſed aggregatum ex particu-
lis minimis ab inuicem ſeparatis, & diſcretis, vt præ-
clarè in nebula obſeruatur, & in alijs aqueis vapo-
ribus, qui ſi attentè conſpiciantur in loco commodo,
ideſt ſi interpoſita nebula viſus dirigatur inſpiciat-
que obſcurum, & tenebroſum aliquem locum, & in-
terim Sol transuerſalitèr eamdem nebulam illuſtret;
tunc illa nebula, quæ repreſentabatur continua ap-
paret eſſe conflata ex immenſa multitudine exiguo-
rum granulorum aquæ, quæ lento quodam motu per
aerem agitantur, vt contingit in ijs fragmentis ter-
reis minutiſſimis, quæ conſpiciuntur in radijs Solis
intra cubicula. Iam prædicta granula aquea copio-
ſiſſima vagantia per aerem non facile viſibilia ſunt
ſigillatim ob eorum exiguitatem, ſed poſſunt tran-

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