Aristoteles, Physicorvm Aristotelis, sev, de natvrali auscultatione, libri octo

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            <s xml:id="echoid-s20897" xml:space="preserve">
              <pb o="50" file="592" n="592" rhead="ARIST. DE ANIMA"/>
            aër percuſſus permanet, neq; </s>
            <s xml:id="echoid-s20898" xml:space="preserve">diffunditur. </s>
            <s xml:id="echoid-s20899" xml:space="preserve">Quapropter ſi
              <lb/>
            citò uehementerq́; </s>
            <s xml:id="echoid-s20900" xml:space="preserve">percutiatur, ſonat: </s>
            <s xml:id="echoid-s20901" xml:space="preserve">opus eſt enim ut per-
              <lb/>
            cutientis motus, diffuſionem præueniat aëris, périnde atq;
              <lb/>
            </s>
            <s xml:id="echoid-s20902" xml:space="preserve">ſi cumulum, aut aceruum arenæ cùm fertur, uelociter quiſ-
              <lb/>
            piam uerberet. </s>
            <s xml:id="echoid-s20903" xml:space="preserve">Fit autẽ echo, ſonitus inquam is, qui poſt
              <lb/>
            ſonum reſultat, cùm aër factus unus cb uas, uel locum, qui
              <lb/>
            terminauit ipſum atq; </s>
            <s xml:id="echoid-s20904" xml:space="preserve">diſſolui prohibuit, inde reſilit ue-
              <lb/>
            luti pila, repulſus. </s>
            <s xml:id="echoid-s20905" xml:space="preserve">Videtur autem talis ſonuus fieriſemper,
              <lb/>
            ſed non ſemper clarus efficitur: </s>
            <s xml:id="echoid-s20906" xml:space="preserve">nã & </s>
            <s xml:id="echoid-s20907" xml:space="preserve">in ſono périndè atq; </s>
            <s xml:id="echoid-s20908" xml:space="preserve">
              <lb/>
            in lumine fit. </s>
            <s xml:id="echoid-s20909" xml:space="preserve">Lumen enim ſemper refrangitur, alioquin
              <lb/>
            nõ fieret lumen ubiq;</s>
            <s xml:id="echoid-s20910" xml:space="preserve">, ſed eſſent extra locum eum tenebræ,
              <lb/>
            quò radijſolis perueniunt. </s>
            <s xml:id="echoid-s20911" xml:space="preserve">Verùm non ita ſemper refran-
              <lb/>
            gitur, ut umbram efficiat, qua terminare lumen ſolemus: </s>
            <s xml:id="echoid-s20912" xml:space="preserve">
              <lb/>
            quod quidem tum fit, cùm ab aqua, uel aëre, cæterisq́; </s>
            <s xml:id="echoid-s20913" xml:space="preserve">leui-
              <lb/>
            bus, ut patet, reflectitur. </s>
            <s xml:id="echoid-s20914" xml:space="preserve">Rectè autem à ueteribus audiendi
              <lb/>
            uacuo tribuitur autoritas: </s>
            <s xml:id="echoid-s20915" xml:space="preserve">nam aër, uacuum eſſe uidetur, is
              <lb/>
            autem eſt, qui audire facit, cùm cõtinuus, unusq́; </s>
            <s xml:id="echoid-s20916" xml:space="preserve">fuerit agi-
              <lb/>
            tatus. </s>
            <s xml:id="echoid-s20917" xml:space="preserve">Verũ quia fragilis eſt, non perſonat, niſi id quod eſt
              <lb/>
            percuſſum, ſit leue: </s>
            <s xml:id="echoid-s20918" xml:space="preserve">tum enim unus ipſe ſimul ob planitiem
              <lb/>
            ipſam euadit: </s>
            <s xml:id="echoid-s20919" xml:space="preserve">leuis nãq; </s>
            <s xml:id="echoid-s20920" xml:space="preserve">corporis planũ, eſt unũ. </s>
            <s xml:id="echoid-s20921" xml:space="preserve">Id igitur
              <lb/>
            ſonum efficit, quod mouet uſq; </s>
            <s xml:id="echoid-s20922" xml:space="preserve">ad auditum continuatione
              <lb/>
            aërem unũ. </s>
            <s xml:id="echoid-s20923" xml:space="preserve">Ineſt autem auditui quidã inſitus aër, atq; </s>
            <s xml:id="echoid-s20924" xml:space="preserve">cùm
              <lb/>
            auditus in aëre ſit, cùm externus aër mouetur, & </s>
            <s xml:id="echoid-s20925" xml:space="preserve">internus
              <lb/>
            mouetur, ac agitatur. </s>
            <s xml:id="echoid-s20926" xml:space="preserve">Quapropter animal non omni audit
              <lb/>
            ex parte, neq; </s>
            <s xml:id="echoid-s20927" xml:space="preserve">quouis aër pertranſit, & </s>
            <s xml:id="echoid-s20928" xml:space="preserve">penetrat: </s>
            <s xml:id="echoid-s20929" xml:space="preserve">quippe
              <lb/>
            cùm animatũ nõ habeat aërem ubiq;</s>
            <s xml:id="echoid-s20930" xml:space="preserve">, quo poßit quauis ſua
              <lb/>
            parte moueri. </s>
            <s xml:id="echoid-s20931" xml:space="preserve">Ipſe igitur aër uacat ex ſe ſono, quia facilè
              <lb/>
            diſpergi@ur, ac diſſoluitur: </s>
            <s xml:id="echoid-s20932" xml:space="preserve">uerum cùm prohibetur diſſolui,
              <lb/>
            tum motio ipſius eſt ſonus. </s>
            <s xml:id="echoid-s20933" xml:space="preserve">At is aër, qui in auribus eſt col-
              <lb/>
            locatus, intus eſt cõditus, ut ſit immobilis: </s>
            <s xml:id="echoid-s20934" xml:space="preserve">atq; </s>
            <s xml:id="echoid-s20935" xml:space="preserve">hoc, ut </s>
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