Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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            <s xml:id="echoid-s186" xml:space="preserve">
              <pb o="8" file="0014" n="14" rhead="HERONIS"/>
            aliud augmentum ipſis accidere mente concipi poteſt: </s>
            <s xml:id="echoid-s187" xml:space="preserve">ex
              <lb/>
            quibus perſpicuum eſt in aëris corporibus diſſeminata eſſe
              <lb/>
            quædam vacua inter media, & </s>
            <s xml:id="echoid-s188" xml:space="preserve">vi quadam adveniente ea
              <lb/>
            præter naturam in vacua reclinare: </s>
            <s xml:id="echoid-s189" xml:space="preserve">aer autem qui eſt in va-
              <lb/>
            ſe inverſo in aquam, haud valde comprimitur. </s>
            <s xml:id="echoid-s190" xml:space="preserve">Quod enim
              <lb/>
            vim infert ad id efficiendum minime idoneum eſt, quippe
              <lb/>
            cum naturaliter aqua ipſa in ſe ipſa neque gravitatem, ne-
              <lb/>
            que vehementem compreſſionem habeat: </s>
            <s xml:id="echoid-s191" xml:space="preserve">quamobrem con-
              <lb/>
            tingit, ut urinantes in profundum maris infinitas metretas
              <lb/>
            ſupra humeros habentes ab aqua non cogantur reſpirare, cum
              <lb/>
            parvus omnino aër in naribus comprehendatur. </s>
            <s xml:id="echoid-s192" xml:space="preserve">Quæ au-
              <lb/>
            tem cauſſa ſit, cur ii, qui in profundo natant ſicuti dictum
              <lb/>
            eſt, infinitum aquæ pondus ſupra humeros habentes non
              <lb/>
            comprimuntur, conſideratione dignum videtur: </s>
            <s xml:id="echoid-s193" xml:space="preserve">dicunt
              <lb/>
            igitur quidam propterea quod aqua æque gravis eſt ipſa ſe-
              <lb/>
            cundum ſe ipſam; </s>
            <s xml:id="echoid-s194" xml:space="preserve">Hi autem nihil dicunt propter quid ii,
              <lb/>
            qui deorſum natant à ſuperiori aqua non comprimantur:
              <lb/>
            </s>
            <s xml:id="echoid-s195" xml:space="preserve">itaque illud hoc modo demonſtrandum eſt: </s>
            <s xml:id="echoid-s196" xml:space="preserve">intelligamus
              <lb/>
            ſuperius humidum à ſuperficie compreſſi ſecundum quam
              <lb/>
            imponitur aqua, corpus aliquod eſſe æque grave atque hu-
              <lb/>
            midum, habensque eandem figuram, quam humidum ſu-
              <lb/>
            perius: </s>
            <s xml:id="echoid-s197" xml:space="preserve">hoc autem intelligamus in humidum injici, ita ut
              <lb/>
            inferior ipſius ſuperficies compreſſo congruat ſitque tan-
              <lb/>
            quam illud ipſum; </s>
            <s xml:id="echoid-s198" xml:space="preserve">& </s>
            <s xml:id="echoid-s199" xml:space="preserve">ſimiliter ac ſuperius humidum impo-
              <lb/>
            natur: </s>
            <s xml:id="echoid-s200" xml:space="preserve">perſpicuum igitur eſt hoc corpus dimiſſum neque ab
              <lb/>
            humido quicquam extare, neque ſub humidi ſuperioris ſu-
              <lb/>
            perficie demergi. </s>
            <s xml:id="echoid-s201" xml:space="preserve">ſiquidem demonſtratum eſt ab Archi-
              <lb/>
            mede in libro de iis, quæ in aqua vehuntur corpora æque-
              <lb/>
            gravia atque humidum in humidum dimiſſa neque extare
              <lb/>
            ab humido, neque demergi: </s>
            <s xml:id="echoid-s202" xml:space="preserve">non igitur comprimet ea quæ
              <lb/>
            ſubjiciuntur: </s>
            <s xml:id="echoid-s203" xml:space="preserve">ablatis autem deſuper comprimentibus cor-
              <lb/>
            pus in eodem loco permanebit: </s>
            <s xml:id="echoid-s204" xml:space="preserve">quomodo igitur compri-
              <lb/>
            met corpus quod non appetit in inferiorem locum deſcen-
              <lb/>
            dere? </s>
            <s xml:id="echoid-s205" xml:space="preserve">eodem modo & </s>
            <s xml:id="echoid-s206" xml:space="preserve">humidum ubi erat corpus </s>
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