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

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1
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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