Casati, Paolo
,
De igne dissertationes physicae
,
1686
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De ignis loco.
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Auri tinctura pag. </
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<
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<
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xml:space
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">Solue, inquit, metallum ſulphu-
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reum aliquod, vt ferrum, aut cuprum, quouis ſpiritu acido:
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</
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<
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">denuòque abſtrahe ſpiritum: </
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">id quod remanet candefacito, non
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tamen nimis, ſed quantum ſufficit ad omnimodam ſpirituum ex-
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pirationem. </
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<
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">Reliquam huiuſmodi materiam (obſeruato priùs
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illius pondere) crucibulo immiſſam colloca in igne (caue tamen,
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ne fluat metallum, ſed ſaltem obſcurè candeat cum crucibulo)
<
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trium vel quatuor hebdomadum ſpatio. </
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<
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">Quo tempore elapſo,
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iterum exemptum metallum ad libræ lances examina, & </
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<
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">re ipſa
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euidens experiere metalli tui incrementum. </
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<
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">Alterum eſt, quod
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ille vocat Euidentius. </
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<
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">Colloca cuprum, vel aliud metallum ſul-
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phureum cum 16 vel 18 partibus plumbi in cupellâ optimè cre-
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matâ factâ è cineribus ligni vel oſſium, in fornace docimaſticà
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(obſeruato priùs exactiſſimè pondere cupellæ, cupri, & </
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<
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">plumbi)
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& </
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<
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">igne, non tamen nimio, fac euaneſcere cum plumbo cuprum. </
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Quo facto exime cupellam, vbi refrixerit: </
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">& </
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<
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">illam denuò exami-
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natam librâ reperies longè grauiorem, ita vt pondus eius (quam-
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uis multum plumbi in auras abierit in cupellatione) excedat non
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modò proprium ſed etiam cupri & </
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<
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<
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">Quid additum
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eſt præter ignem?</
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">Grad. </
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">Quanquam ſatis perſpectum habeam à non paucis hanc
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igniculorum irruptionem in vaſa igni expoſita improbari, neque
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prorſus velint aquam ſubditis ignibus efferueſcere, quòd illi cali-
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da effluuia per vaſis meatus illapſa commiſceantur; </
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<
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">Ego tamen ab
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hac philoſophandi methodo non abhorreo, & </
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">facilè adducor, vt
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admittam tenuiſſimas ignium particulas ita ſe in metallorum po-
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ros inſinuare, vt illis implicatæ & </
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<
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">permiſtæ cohæreant. </
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<
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">Verùm
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ab illâ tam penitùs inſitâ, tam vetuſtâ opinione, quæ lycea op-
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pleuit, nec ſolùm ad opinionem vulgi retenta videtur, de Ignis
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leuitate, cum eâ iam tum puer imbutus fuerim, non adeò prom-
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ptè me expedio; </
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<
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">propterea me omnem priùs in partem verſo, quàm
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illam ex animo excutiam. </
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">Fingamus
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molem ali quam ex ferro & </
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<
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">ligno compoſitam, huiuſque molis gra-
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uitatem in aquâ examinemus. </
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">Tum moles illa in ardenti fornace
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tantiſper retineatur, dum lignum vi ignis abſumatur; </
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<
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">aut potiùs
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(nequam fortè additi ponderis ſuſpicionem ingerant igniculi) cul-
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tro eximantur aut omnes, aut plurimæ partes ligni. </
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rum in aquâ examinetur molis illius grauitas, & </
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