Casati, Paolo
,
De igne dissertationes physicae
,
1686
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Diſſertatio Quarta.
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nium ſtatuamus, non continuò omnibus igniculis in corporum
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coagmentatione requiſitis ſummam pariter grauitatem tribuen-
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dam cenſemus: </
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<
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">ſicut enim illorum natura valde diſſimilis eſt, ita
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quoque diſpares eorundem grauitates eſſe poſſunt immò: </
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">& </
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bus Spiritibus leuitatem aliquam facilè poſſumus tribuere, vt in
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Atmoſphærâ ſponte aſcendant, atque iterum vaporibus immiſti
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deſcendant. </
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">Quod ſi & </
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">ſyderibus de-
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lapſos corporibus immiſceri quis non ægrè concedat, eos ingeni-
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tâ vi ad ſuæ originis caput contendere poſſe, negare non poterit,
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atque adeò terreſtres igniculos graues & </
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<
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">fixos ſtatuet, leues verò
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atque volatiles, quos ſydera eiaculantur. </
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">An verò ex hoc, quod
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glacies concreta exponatur nocturno frigori brumali, atque poſt-
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ridie mane deprehendatur diminutum eius pondus, quod pridie
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veſperi indicârat libra, argui poſſit graues eſſe igniculos, quos
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maius frigus expreſſit ex glacie, in medio relinquo. </
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">Certè, cum
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olea ferè omnia ſupernatent aquæ, oleum ex cinnamomo & </
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ryophyllis fundum petit: </
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">quantum verò igniculorum in his repe-
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riatur, nemo neſcit.</
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">Quæ heſternâ collocutione diſputauimus, animo re-
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colebam, atque ignem vehementi calore præditum, quin
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aliquâ luce fulgeret, facilè admittendum eſſe mecum ipſe reputa-
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bam, cùm ſæpè obſeruauerim extinctam faculam accendi, quam-
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uis à flammæ cuſpide remotam eo loco, vbi lux nulla appareret,
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modò nimium non eſſet interuallum ab ardente candelâ: </
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<
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">Nec ibi
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minus eſſe ignis, quàm in ipſâ flammâ, hinc conſtat, quod mul-
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to citiùs, quàm admota ad flammæ latus, facula ibi ignem con-
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cipit. </
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">Quapropter ſi in terræ viſceribus eiuſmodi ignem admitta-
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mus, qualis ex flammæ cuſpide erumpit obſcurus, vtique pluri-
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mam efficacitatem à luce ſeiunctam habebimus. </
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">Hinc prout ex aliâ
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in aliam cogitationem deſcendere procliue eſt, illicò menti ſeſe
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obiecit illa controuerſia, Vtrùm Ignis, an Terra eſſet, quę An-
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tiquis Veſta dicebatur: </
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">hanc enim in Vniuerſitatis centro omnes
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ſtatuebant, cùm Plato in Phædro reliquos Deos ſubſequi Iouis </
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