Casati, Paolo, De igne dissertationes physicae, 1686

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              <pb o="160" file="0588" n="588" rhead="Diſſertatio Quinta."/>
            tur: </s>
            <s xml:id="echoid-s19034" xml:space="preserve">quod ſi gravitatis ſpeciem mutet moles, quæ innatabat;
              <lb/>
            </s>
            <s xml:id="echoid-s19035" xml:space="preserve">deſcendit, ut cruſtulum in vini cyatho immiſſum initio innatat,
              <lb/>
            ſed aëre ſenſim abunte deprimitur, & </s>
            <s xml:id="echoid-s19036" xml:space="preserve">ad fundum uſque deſcen-
              <lb/>
            dit; </s>
            <s xml:id="echoid-s19037" xml:space="preserve">contra verò quod ſuâ gravitate fundum petiit, poſtmo-
              <lb/>
            dum aſcendit, ut cadaver hominis, cui nandi imperito aqua
              <lb/>
            animam intercluſit, poſt triduum enatat, cum putreſcens
              <lb/>
            intumuerit.</s>
            <s xml:id="echoid-s19038" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s19039" xml:space="preserve">Dand. </s>
            <s xml:id="echoid-s19040" xml:space="preserve">Si ex halitibus ſidereis Cometas etiam ſublunares
              <lb/>
            concreſcere dicamus, ut in illis diurnæ convolutionis princi-
              <lb/>
            pium & </s>
            <s xml:id="echoid-s19041" xml:space="preserve">Cauſam ſtatuamus, timebam, ne quis obiiceret, aut
              <lb/>
            nullos Cometas tellurem circumeuntes accendi, aut cœleſtem
              <lb/>
            materiam combuſtionis eſſe capacem, affirmandum eſſe. </s>
            <s xml:id="echoid-s19042" xml:space="preserve">Pri-
              <lb/>
            mum illud communi opinioni adverſatur; </s>
            <s xml:id="echoid-s19043" xml:space="preserve">alterum probabile
              <lb/>
            non videtur, cum è Planetis effluant, quos comburi poſſe nemo
              <lb/>
            niſi temerè concedat. </s>
            <s xml:id="echoid-s19044" xml:space="preserve">Mihi tamen illico ipſe reſpondi, non
              <lb/>
            omnia diverſi generis corpuſcula, quæ in unum Corpus coive-
              <lb/>
            re, ſimiliter obnoxia eſſe calori, aut æquè diſſolvi; </s>
            <s xml:id="echoid-s19045" xml:space="preserve">nam aurifex
              <lb/>
            ut argenteo vaſi aurum inducat, amalgama ex auro & </s>
            <s xml:id="echoid-s19046" xml:space="preserve">Mercu-
              <lb/>
            rio conficit, quo vas oblinat; </s>
            <s xml:id="echoid-s19047" xml:space="preserve">admoto autem igne Mercurius
              <lb/>
            avolat, ſed aurum argento cohæret. </s>
            <s xml:id="echoid-s19048" xml:space="preserve">Immò (id quod propiùs ad
              <lb/>
            rem noſtram facit) in carbone ignito partes aliquas avolare,
              <lb/>
            alias in cinere permanere videmus, quarum vi, utpote gra-
              <lb/>
            vium, deſcendit carbo. </s>
            <s xml:id="echoid-s19049" xml:space="preserve">Simili igitur ratione in Cometâ partes
              <lb/>
            ſulphureæ & </s>
            <s xml:id="echoid-s19050" xml:space="preserve">pingues incendi poſſunt integris ſidereis aſpira-
              <lb/>
            tionibus, quarum vi moles illa compoſita circa tellurem con-
              <lb/>
            vertatur, uſquequo materiâ ſulphureâ abſumptâ ſiderei halitus
              <lb/>
            pariter abſolvantur: </s>
            <s xml:id="echoid-s19051" xml:space="preserve">prout autem magis aut minùs compacta
              <lb/>
            fuerit materia, citiùs aut ſeriùs Cometa extinguitur; </s>
            <s xml:id="echoid-s19052" xml:space="preserve">arida
              <lb/>
            enim citò ardent, pinguia diutiùs; </s>
            <s xml:id="echoid-s19053" xml:space="preserve">& </s>
            <s xml:id="echoid-s19054" xml:space="preserve">quo tempore olei libra
              <lb/>
            ardendo abſumitur, quantum ſtuppæ atque ſtipularum ad
              <lb/>
            fovendum ignem addi oporteret? </s>
            <s xml:id="echoid-s19055" xml:space="preserve">Non tamen concipio Come-
              <lb/>
            tam quaſi globum ſtuppæ ardentis oleo imbutæ nam ea, quæ
              <lb/>
            nos olim de carbone trito cum ceruſsâ ruditer commiſto dixiſſe
              <lb/>
            memini, ſuadent exhalationes ex tellure eductas, quamvis
              <lb/>
            inſtar carbonis aridas, ſi aliis halitibus ſulphureis & </s>
            <s xml:id="echoid-s19056" xml:space="preserve">pinguibus,
              <lb/>
            aut etiam ſidereis commifceantur, poſſe non incendi ſolùm, ſed
              <lb/>
            diu ardere. </s>
            <s xml:id="echoid-s19057" xml:space="preserve">Hinc, quia conceptus in intimis partibus fervor ad
              <lb/>
            circumpoſitam materiam depaſcendam propagari poteſt, acci-
              <lb/>
            dit aliquando Cometæ magnitudinem augeri, aut viciſſim
              <lb/>
            abſumptâ materiæ parte minui: </s>
            <s xml:id="echoid-s19058" xml:space="preserve">quamvis ad apparentis ma-
              <lb/>
            gnitudinis incrementum aut decrementum etiam </s>
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