Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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            <s xml:id="echoid-s294" xml:space="preserve">
              <pb file="0021" n="21" rhead="PRÆFATIO."/>
            thematica, ratiocinandi methodus, hoc axiomate funda-
              <lb/>
            ta; </s>
            <s xml:id="echoid-s295" xml:space="preserve">Pro vero habendum omne quod ſi negetur ſocietas inter
              <lb/>
            homines deſtruitur, aut his vivendi ratio adimitur. </s>
            <s xml:id="echoid-s296" xml:space="preserve">Ex
              <lb/>
            qua propoſitione, quæ a nemine in dubium vocari po-
              <lb/>
            teſt, regulæ philoſophandi Newtonianæ ſecunda & </s>
            <s xml:id="echoid-s297" xml:space="preserve">tertia
              <lb/>
            evidentiſſime deducuntur.</s>
            <s xml:id="echoid-s298" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s299" xml:space="preserve">Niſi enim, quæ ubique obtinent ubi Experimenta inſti-
              <lb/>
            tuere licet, pro generaliter veris habeantur, effectuſque ſimi-
              <lb/>
            les ex cauſa ſimili oriri ponantur, quis per momentum
              <lb/>
            temporis tranquille vivere poterit?</s>
            <s xml:id="echoid-s300" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s301" xml:space="preserve">Quotidie, nequidem ad illud attendendo, ſequentia ra-
              <lb/>
            tiocinia unuſquiſque pro indubitatis habet, & </s>
            <s xml:id="echoid-s302" xml:space="preserve">clare videt
              <lb/>
            horum concluſiones, ſine præſentis rerum conſtitutionis
              <lb/>
            deſtructione, in dubium vocari minime poſſe.</s>
            <s xml:id="echoid-s303" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s304" xml:space="preserve">Ædificium, hodie in omnibus partibus firmiſſimum, cra-
              <lb/>
            ſtino die ſponte non ruet: </s>
            <s xml:id="echoid-s305" xml:space="preserve">id eſt, partium corporum cohæ-
              <lb/>
            ſiohorumque gravitas, quas, niſi interveniente cauſa extra-
              <lb/>
            nea, nunquam mutatas vidi, aut audivi, hac nocte non
              <lb/>
            mutabuntur; </s>
            <s xml:id="echoid-s306" xml:space="preserve">quia cauſa cohæſionis & </s>
            <s xml:id="echoid-s307" xml:space="preserve">gravitatis eadem
              <lb/>
            erit craſtino die ac hodie. </s>
            <s xml:id="echoid-s308" xml:space="preserve">Quod ratiocinium certum eſſe,
              <lb/>
            niſi ex memorato principio deduci non poſſe, quis non
              <lb/>
            videt?</s>
            <s xml:id="echoid-s309" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s310" xml:space="preserve">Tigna & </s>
            <s xml:id="echoid-s311" xml:space="preserve">lapides, quæ in quacunque regione ad ædifi-
              <lb/>
            cium conſtruendum apta ſunt, ſepoſita omni mutatione ex
              <lb/>
            cauſa extranea, hîc tranſlata inſervire poterunt, & </s>
            <s xml:id="echoid-s312" xml:space="preserve">de
              <lb/>
            ruina non magis ſollicitus ero, ac in prima regione incolæ
              <lb/>
            fuiſſent, ſi non tranſlatis tignis & </s>
            <s xml:id="echoid-s313" xml:space="preserve">lapidibus, ipſi exhis do-
              <lb/>
            mum conſtruxiſſent; </s>
            <s xml:id="echoid-s314" xml:space="preserve">id eſt, vis, qua partes cohærent, &</s>
            <s xml:id="echoid-s315" xml:space="preserve"/>
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