Casati, Paolo
,
De igne dissertationes physicae
,
1686
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De ignis loco.
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cenſenda eſſet ignis grauitas, vt & </
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">ibi nihil hians, interceptâ ina-
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nitate, deprehendatur: </
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<
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xml:space
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">aut, ſi ſatis eſſet ignem ſuo ſe ſupremo in
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loco tutari, quin deorſum conetur, cur & </
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<
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">aër eodem iure non
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vtatur, omni ademptâ grauitate? </
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<
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">Quare igni pariter ſua tribuen-
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da eſt grauitas, eiuſque locus eſt centrum, niſi prohibeatur.</
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<
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">Grad. </
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">Hoc omnino conſequens eſſe video, ſi aëri tribuatur
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grauitas, & </
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<
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">ignem grauem eſſe: </
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<
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">ſed priùs aërem omnem perpetuò
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deorſum niti, perſuaderi mihi non opinione ſolùm, ſed ad verita-
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tem planè velim.</
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">Dand. </
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">Pluribus experimentis id ſatis conſtare putant, quorum
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belliſſimè & </
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<
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">perſpicuè rationes & </
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">cauſas proferunt ex aëris graui-
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tate, cùm vulgaris Philoſophia vix ægrè ſatisfaciat.</
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</
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<
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">Grad. </
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">An rerum naturas ex facili explicatione metiri oportet?
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</
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<
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xml:space
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">Quia Philolaicum ſyſtema Solem immotum in centro Orbis Annui
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collocans, & </
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<
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">tellurem in eiuſdem peripheriâ circumagens, erran-
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tium ſyderum Phænomena nitidiùs atque breuiùs explicat, & </
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<
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na telluris circa ſuum axem conuolutio ſydera certis inſixa ſedibus
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abſoluit à velociſſimo motu, propterea Soli, atque Firmamenti
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ſtellis quietem, Telluri motum concedemus? </
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<
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">Quia ſummè opero-
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ſum eſſet ſpirarum, quas Planetæ ſuo motu deſcribunt, rationes
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inire, faciliùs autem per Excentricos & </
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">Epicyclos motuum anoma-
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lias ad calculos reuocamus, an ideò re ipſâ diſtinguitur cœlum in
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orbes circulis illis reſpondentes? </
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<
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">Rerum omnium conditor Deus,
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qui mundum tradidit diſputationi hominum, legem motibus ſta-
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tuit, non quam illi facilè caperent, aut explicarent, ſed quæ ip-
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ſarum rerum naturis, & </
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">vniuerſitatis bono congrueret. </
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">Aliud eſt
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Hypotheſes ingeniosè confingere, aliud veritatem ipſam inueſti-
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gare: </
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<
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">idcirco, quamuis ſuppoſita illa aëris grauitas non parùm
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dilucidè experimentis ſatisfaceret, mera Hypotheſis eſt, niſi grauia
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argumenta rei tam dubiæ faciant fidem. </
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<
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">Quid enim prohibet,
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explosâ omni grauitate, ſolam leuitatem ſtatuere, adeò vt le-
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uiora corpora deorſum protrudant naturas minùs leues, quæ cum
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illis comparatæ graues videantur? </
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<
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">Si vtris aĕre inflati, & </
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">aquæ
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immerſi, conatum, quo manum deprimentis repellit, non aëri ſuâ
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leuitate ſurſum connitenti tribuendum ducas, ſed aquæ grauitati
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extrudenti minorem aëris grauitatem; </
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<
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">ego viciſſim ſaxa, & </
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bum, leuia dixero, ſed minùs leuia quàm aër & </
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momentum deorſum aduersùs manum ſuſtinentis tribuam </
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