Casati, Paolo, De igne dissertationes physicae, 1686

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            <s xml:id="echoid-s16040" xml:space="preserve">
              <pb o="65" file="0493" n="493" rhead="De Ignibus Aeris."/>
            ſumus. </s>
            <s xml:id="echoid-s16041" xml:space="preserve">Quapropter ad ſulphureum genus revocanda videtur
              <lb/>
            potiſſima fulminis natura; </s>
            <s xml:id="echoid-s16042" xml:space="preserve">cui tamen aliquas etiam ſalinas
              <lb/>
            particulas (ſivè Nitroſas, ſivè Tartareas dixeris, ſivè his ana-
              <lb/>
            logas) cum vapore aqueo in ſublime evectas admiſceri non
              <lb/>
            negaverim; </s>
            <s xml:id="echoid-s16043" xml:space="preserve">quemadmodum & </s>
            <s xml:id="echoid-s16044" xml:space="preserve">diximus, cum de Auro Fulmi-
              <lb/>
            nante diſierebamus.</s>
            <s xml:id="echoid-s16045" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s16046" xml:space="preserve">Grad. </s>
            <s xml:id="echoid-s16047" xml:space="preserve">In mediâ illâ aëris regione, ubi nubes coguntur, pluri-
              <lb/>
            morum generum anhelitus, etiam ſalinos, reperiri, ſatis apertè
              <lb/>
            oſtendit pluviæ fœcunditas, ſi præſertim inter tonitruum frago-
              <lb/>
            rem decidat, cujus tepor igniculorum admiſtionem indicat.
              <lb/>
            </s>
            <s xml:id="echoid-s16048" xml:space="preserve">In tempeſtatibus autem magna fit in nube halituum agitatio: </s>
            <s xml:id="echoid-s16049" xml:space="preserve">
              <lb/>
            & </s>
            <s xml:id="echoid-s16050" xml:space="preserve">quemadmodum pars lactis pinguior multâ agitatione ſepa-
              <lb/>
            ratur in butyrum, ita coagitatis vaporibus particulæ ſulphureæ
              <lb/>
            & </s>
            <s xml:id="echoid-s16051" xml:space="preserve">bitumineæ congregantur ad conſtituendam fulminis mate-
              <lb/>
            riam, quæ demum accenditur, & </s>
            <s xml:id="echoid-s16052" xml:space="preserve">cum fragore erumpit. </s>
            <s xml:id="echoid-s16053" xml:space="preserve">Cum
              <lb/>
            autem non alia mihi videatur eſſe fulguris materia ac fulminis,
              <lb/>
            hoc inter ſe diſtare crediderim, quòd fulminis materia magis
              <lb/>
            compacta ſit, quàm fulguris, atque idcircò illa non ſicut fulgur
              <lb/>
            intrà nubis anguſtias tantum fremat cum tonitru, & </s>
            <s xml:id="echoid-s16054" xml:space="preserve">diſſipetur,
              <lb/>
            ſed etiam quaſi conglobata deſcendat, atque exploſa Montes
              <lb/>
            turreſque percutiat, vix credibili impulſu, niſi montium rimas,
              <lb/>
            turreſque diſiectas videremus. </s>
            <s xml:id="echoid-s16055" xml:space="preserve">Quòd ſi gravatè non audieritis,
              <lb/>
            paucis exponam, quâ ratione conatus fuerim fulminis motum
              <lb/>
            deorſum explicare, præter ipſam ignis, quam olim adſtrueba-
              <lb/>
            mus, gravitatem. </s>
            <s xml:id="echoid-s16056" xml:space="preserve">Oſervabam in motu corporis fluidi turbina-
              <lb/>
            tim convoluti, ſivè aër fuerit, ſivè aqua, niſum eſſe deorſum; </s>
            <s xml:id="echoid-s16057" xml:space="preserve">
              <lb/>
            motus enim in ſupremâ ſuperficie videtur incipere, ſimilem-
              <lb/>
            que impetûs directionem ſubjectis partibus communicare. </s>
            <s xml:id="echoid-s16058" xml:space="preserve">Sic
              <lb/>
            Typhones ex nube deſcendunt, & </s>
            <s xml:id="echoid-s16059" xml:space="preserve">naves deprimendo ſubmer-
              <lb/>
            gunt: </s>
            <s xml:id="echoid-s16060" xml:space="preserve">ſic majores aquarum vortices, ut Charybdis, navigia
              <lb/>
            abſorbent: </s>
            <s xml:id="echoid-s16061" xml:space="preserve">& </s>
            <s xml:id="echoid-s16062" xml:space="preserve">in minoribus fluviorum vorticibus, quos in Pado
              <lb/>
            præſertim frequentes videmus, non ſolùm feſtucæ in illos inci-
              <lb/>
            dentes, ſed & </s>
            <s xml:id="echoid-s16063" xml:space="preserve">minùs periti natatores aliquando abſorbentur: </s>
            <s xml:id="echoid-s16064" xml:space="preserve">
              <lb/>
            atque ſi exundaverit flumen, poſtquam ſe in alveum recepit,
              <lb/>
            ſolum paſſim ab hujuſmodi vorticibus excavatum relinquit; </s>
            <s xml:id="echoid-s16065" xml:space="preserve">
              <lb/>
            quin im̃ò nonnunquam ingentes & </s>
            <s xml:id="echoid-s16066" xml:space="preserve">amplæ voragines, atque adeò
              <lb/>
            altè depreſſæ conſpiciuntur, ut in iis aqua perpetuò ſcaturiat,
              <lb/>
            ut in puteis. </s>
            <s xml:id="echoid-s16067" xml:space="preserve">Si igitur in nube contingat non ſolùm materiam
              <lb/>
            fulmineam ex agitatione in unum congregari, ſed etiam adver-
              <lb/>
            ſis ventorum flatibus comprimi & </s>
            <s xml:id="echoid-s16068" xml:space="preserve">convolui, illa utique conſti-
              <lb/>
            patur, atque deorſum exprimitur, uſque eò dum factâ </s>
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