Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. LXIV.
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Fumi structura, & compoſitio declaratur.
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<
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">COnſtat fumum eſſe maſſam copioſam particula
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rum exiguarum olei, terræ, & aquæ, quæ par
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ticulæ ab inuicem diſcretæ, & ſeparatæ nondùm̨
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accenſæ ſunt, licèt valdè excalefactæ ſint. </
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<
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confirmatur ab operatione chymica, poſſunt enim̨
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recolligi ex fumo partes aqueæ ſegregatæ, & diſcre
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tæ à partibus vnctuoſis, & ſulphureis, nec non à
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particulis terreis, & fuliginoſis, & viciſſim quæli
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bet ex prædictis ſubſtantijs recuperari poteſt ſepa
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rata à reliquis; præterea conſtat ſenſu, fumum noņ
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eſſe corpus continuum, ſed aggregatum ex particu
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lis minimis ab inuicem ſeparatis, & diſcretis, vt præ
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clarè in nebula obſeruatur, & in alijs aqueis vapo
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ribus, qui ſi attentè conſpiciantur in loco commodo,
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ideſt ſi interpoſita nebula viſus dirigatur inſpiciat
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que obſcurum, & tenebroſum aliquem locum, & in
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terim Sol transuerſalitèr eamdem nebulam illuſtret;
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tunc illa nebula, quæ repreſentabatur continua ap
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paret eſſe conflata ex immenſa multitudine exiguo
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rum granulorum aquæ, quæ lento quodam motu per
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aerem agitantur, vt contingit in ijs fragmentis ter
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reis minutiſſimis, quæ conſpiciuntur in radijs Solis
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intra cubicula. </
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<
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">Iam prædicta granula aquea copio
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ſiſſima vagantia per aerem non facile viſibilia ſunt
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ſigillatim ob eorum exiguitatem, ſed poſſunt tran-</
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