Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſitum luci impedire, & componunt apparentiam il
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lam vnius ſubſtantiæ raræ, & expanſæ, vti pariter
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multoties accidit in tempore pluuiæ, quo guttæ
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aquæ decidentes ab inuicem ſeparatę, ſi à loco aliquo
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diſtanti, & remoto inſpiciantur, ſimillimæ videntur
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nebulis, & fumo. </
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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. LXV.
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Fumus non eſt res accenſa, & quamobrem ab ambiente ac
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re ſursùm exprimi poteſt.
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<
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">QVòd poſtea partes minimæ fumum componen
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tes non ſint adhùc accenſæ, experientia
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,
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quia videmus multoties fumum accendi, atque in
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flammari
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quãdo
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eum
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flamma viua alicuius can
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delæ, prætereà videtur quoque impoſſibile fumum
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eſſe rem accenſam, quia nimirùm fumus gignitur in
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cauitatibus, atque poroſitatibus internis ſigni, vel
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cuiuslibet alterius corporis fumum eructantis, ſed
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in hiſce locis anguſtis reſtrictiſque nedum fumus ac
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cendi non poteſt, vt è contrà flammæ ipſæ iam
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accẽ-ſæ
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ſæ</
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in eiſdem locis anguſtis concluſiſque momento
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extinguantur, ſuffocenturque; imò licet concauita
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tes cauernoſæ ſint amplę, vt eſt cauitas alicuius later
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næ vndique occluſæ, ſubitò
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extinguitur,
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quã-tò
">quan
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tò</
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magis hoc fieri debet quando cauitates, & poro
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ſitates ſunt reſtrictæ, & anguſtiſſimæ, vt ſunt pori li
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gni, vel alterius conſimilis corporis. </
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<
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">Licèt ergo præ
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dicta fragmenta exigua fumum componentia
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ſint </
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