Casati, Paolo, De igne dissertationes physicae, 1686

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            <s xml:id="echoid-s2161" xml:space="preserve">
              <pb o="67" file="0079" n="79" rhead="De ignis loco."/>
            lucratam fuiſſe ponderis grana ſex, ita tamen vt ſeptem ſcrupu-
              <lb/>
            la & </s>
            <s xml:id="echoid-s2162" xml:space="preserve">amplius in calcem ſubcæſiam conuerſa fuerint. </s>
            <s xml:id="echoid-s2163" xml:space="preserve">Cum verò
              <lb/>
            calcis illius (quod Plumbi & </s>
            <s xml:id="echoid-s2164" xml:space="preserve">extinctæ Flammæ aggregatum ipſe
              <lb/>
            vocat) pondus in Aquâ examinaretur, deprehenſa eſt ſpecifica
              <lb/>
            grauitas minor ſpecificâ grauitate Plumbi, cuius grauitas ad a que
              <lb/>
            mole paris grauitatem eſt proximè vt 23 ad 2, ſubtilis verò huius
              <lb/>
            Calcis grauitas inuenta eſt ſolùm vt 9 ad 1. </s>
            <s xml:id="echoid-s2165" xml:space="preserve">Ex quo manifeſtè de-
              <lb/>
            prehenditur (ſi Calx ſit Metalli & </s>
            <s xml:id="echoid-s2166" xml:space="preserve">Ignis aggregatum) additum
              <lb/>
            quidem fuiſle metallo aliquid, quod in aëre graue ſit, cum me-
              <lb/>
            talli pondus augeatur, non tamen illud additamentum in metalli
              <lb/>
            naturam tranſijſſe, cum ipſi metallo, vtpote leuius aquâ, de-
              <lb/>
            trahat grauitatem. </s>
            <s xml:id="echoid-s2167" xml:space="preserve">Hanc verò ſpecificæ grauitatis mutationem
              <lb/>
            in Calce plumbi obſeruatam, ſatis probabili coniecturâ exiſtima-
              <lb/>
            re poſſumus contigiſſe etiam laminæ cupreæ, atque argenteæ, in
              <lb/>
            quibus manifeſtus tumor apparuit. </s>
            <s xml:id="echoid-s2168" xml:space="preserve">Deinde adhuc incertum ma-
              <lb/>
            net, vtrùm igniculi illi ſuapte naturâ grauiores ſint aëre iſto in-
              <lb/>
            fimo, in quo viuimus, & </s>
            <s xml:id="echoid-s2169" xml:space="preserve">experimenta inſtituimus: </s>
            <s xml:id="echoid-s2170" xml:space="preserve">Quemadmo-
              <lb/>
            dum enim aërem conſimili aëre neque grauiorem, neque leuiorem
              <lb/>
            dicimus, fieri tamen poteſt, vt plurimus aër in locum vnum con-
              <lb/>
            geſtus atque conſtipatus grauior fiat aëre non conſtipato, vt in
              <lb/>
            follibus pugillatorijs videmus, quos etiam aëre hoc noſtro gra-
              <lb/>
            uiores futuros exiſtimo, quamuis in altiſſimo monte inflati fuiſſent
              <lb/>
            aëre tenuiſſimo & </s>
            <s xml:id="echoid-s2171" xml:space="preserve">leuiori, atque huc adducti: </s>
            <s xml:id="echoid-s2172" xml:space="preserve">Ita pariter quid
              <lb/>
            prohibet igniculos ſuapte quidem naturâ leuiores aëre, aut certè
              <lb/>
            non grauiores, eâ copiâ demum in metalli poros congeri, vt plu-
              <lb/>
            rimum materiæ in anguſtiſſimo ſpatiolo collocatum exigat minùs
              <lb/>
            abeſſe à centro grauium, quàm circunfluus aër minus habens ma-
              <lb/>
            teriæ in mole pari? </s>
            <s xml:id="echoid-s2173" xml:space="preserve">Quapropter hiſce atque eiuſmodi experimen-
              <lb/>
            tis ne plus æquo tribuatur, cauendum; </s>
            <s xml:id="echoid-s2174" xml:space="preserve">nec niſi meram coniectu-
              <lb/>
            ram ex ijs capiendam cenſeo: </s>
            <s xml:id="echoid-s2175" xml:space="preserve">Noui enim, quàm multa ſint, quę
              <lb/>
            nos fallunt probabilitate magnâ, vt aiebat Cicero in Academi-
              <lb/>
            cis. </s>
            <s xml:id="echoid-s2176" xml:space="preserve">Sed neque ob quamlibet obiectam difficultatem reijcienda
              <lb/>
            ſunt: </s>
            <s xml:id="echoid-s2177" xml:space="preserve">nam ſi nullo adhuc experimento didicimus ita poſſe aërem
              <lb/>
            conſtipari, vt aquæ grauitatem ſuperet, non facilè admittendum
              <lb/>
            congeſtos igniculos fieri aëre grauiores, ſi ſinguli ſint ſecundùm ſpe-
              <lb/>
            ciem leuiores ipſo aëre.</s>
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            <s xml:id="echoid-s2179" xml:space="preserve">Dand. </s>
            <s xml:id="echoid-s2180" xml:space="preserve">Si nobis, qua methodo Plumbi calx intrà aquam ex-
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            penſa fuerit, innoteſceret, fortaſſe lux aliqua maior affulgeret </s>
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