Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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            minatum in aëre, & </s>
            <s xml:id="echoid-s50" xml:space="preserve">humido & </s>
            <s xml:id="echoid-s51" xml:space="preserve">igne, aliisque corporibus;
              <lb/>
            </s>
            <s xml:id="echoid-s52" xml:space="preserve">quibus maxime aſſentiri convenit, ex iis enim, quæ appa-
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            rent, & </s>
            <s xml:id="echoid-s53" xml:space="preserve">ſub ſenſum cadunt, in ſequentibus hoc ita eſſe de-
              <lb/>
            monſtrabitur. </s>
            <s xml:id="echoid-s54" xml:space="preserve">Nam vaſa, quæ multis vacua videntur, non
              <lb/>
            ſunt vacua, ut putant, ſed aëre plena. </s>
            <s xml:id="echoid-s55" xml:space="preserve">Aër autem, ut placet
              <lb/>
            iis, qui de natura tractant, ex parvis, levibusque corporibus
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            conſtat, nobis plerumque non apparentibus. </s>
            <s xml:id="echoid-s56" xml:space="preserve">Etenim ſi in
              <lb/>
            vas quod vacuum videtur quisaquam infundat, quantum
              <lb/>
            aquæ in vas ingredietur, tantundem aëris excedet. </s>
            <s xml:id="echoid-s57" xml:space="preserve">Quod
              <lb/>
            autem dictum eſt, ex hoc intelligere quiſpiam poteſt. </s>
            <s xml:id="echoid-s58" xml:space="preserve">Nam
              <lb/>
            ſi vas, quod vacuum videtur quis inverſum in aquam de-
              <lb/>
            preſſerit, rectumque ſervarit, aqua in ipſum non ingredie-
              <lb/>
            tur, quamvis totum occultatum fuerit. </s>
            <s xml:id="echoid-s59" xml:space="preserve">Itaque perſpicuum
              <lb/>
            eſt, aërem, cum corpus exiſtat, non permittere aquam ingre-
              <lb/>
            di, propterea, quod totus, qui in vaſe locus eo repletus eſt. </s>
            <s xml:id="echoid-s60" xml:space="preserve">
              <lb/>
            Si igitur vaſis fundum quis perforet, aqua quidem per os in
              <lb/>
            ipſum ingredietur; </s>
            <s xml:id="echoid-s61" xml:space="preserve">aër vero per foramen exibit. </s>
            <s xml:id="echoid-s62" xml:space="preserve">Rurſus
              <lb/>
            antequam perforetur fundum, ſi quis rectum vas ex aqua
              <lb/>
            extulerit, convertens videbit totam interiorem ejus ſuper-
              <lb/>
            ficiem ab humido vacuam, atque puram eſſe, quemadmo-
              <lb/>
            dum erat priuſquam demergeretur. </s>
            <s xml:id="echoid-s63" xml:space="preserve">Quare aërem corpus
              <lb/>
            eſſe exiſtimandum eſt. </s>
            <s xml:id="echoid-s64" xml:space="preserve">Fit autem ſpiritus cum movetur,
              <lb/>
            nihil cnim aliud eſt ſpiritus, niſi motus aër, itaque perfora-
              <lb/>
            to vaſe ad fundum, & </s>
            <s xml:id="echoid-s65" xml:space="preserve">aqua ingrediente, ſi quis foramini
              <lb/>
            manum opponat, ſentiet ſpiritum ex vaſe excedentem. </s>
            <s xml:id="echoid-s66" xml:space="preserve">
              <lb/>
            Hoc autem non eſt aliud niſi aër ab aqua expulſus, non igi-
              <lb/>
            tur arbitrandum eſt in his, quæ ſunt, vacui naturam quan-
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            dam coacervatam ipſam per ſe ipſam exiſtere, ſed ſecun-
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            dum exiguas partes in aëre, & </s>
            <s xml:id="echoid-s67" xml:space="preserve">humido, aliisque corporibus
              <lb/>
            diſſeminatam, niſi fortaſſe quiſpiam credat ſolum adaman-
              <lb/>
            tem vacui natura expertem eſſe: </s>
            <s xml:id="echoid-s68" xml:space="preserve">quippe qui neque igni-
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            ri, neque rumpi poteſt: </s>
            <s xml:id="echoid-s69" xml:space="preserve">& </s>
            <s xml:id="echoid-s70" xml:space="preserve">percuſſus in incudes & </s>
            <s xml:id="echoid-s71" xml:space="preserve">malleos
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            totus ingreditur. </s>
            <s xml:id="echoid-s72" xml:space="preserve">Hoc autem ipſi accidit, non quod vacuo
              <lb/>
            careat, ſed ob continuatam denſitatem: </s>
            <s xml:id="echoid-s73" xml:space="preserve">ignis enim </s>
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