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

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          <pb file="0017" n="17" rhead="PRÆFATIO."/>
          <p>
            <s xml:id="echoid-s204" xml:space="preserve">In incerto relinquendum quod incertum eſt; </s>
            <s xml:id="echoid-s205" xml:space="preserve">& </s>
            <s xml:id="echoid-s206" xml:space="preserve">ne i-
              <lb/>
            gnorantiam fateri pudeat: </s>
            <s xml:id="echoid-s207" xml:space="preserve">neque timendum de ignoto ni-
              <lb/>
            mium affirmari, dum ſubjectum omnino ignotum quibuſ-
              <lb/>
            dam incognitis proprietatibus forte præditum eſſe aſſeri-
              <lb/>
            mus. </s>
            <s xml:id="echoid-s208" xml:space="preserve">Qui vero cum hoc axiomate ſe nixos dicunt, quod
              <lb/>
            de incognitis non ſit ratiocinandum, pro ratiocinii tamen
              <lb/>
            fundamento habent, nil circa Corpus ignoti dari, niſi
              <lb/>
            forte fortuna errorem non vitabunt.</s>
            <s xml:id="echoid-s209" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s210" xml:space="preserve">Corporis proprietates a priori detegi nequeunt; </s>
            <s xml:id="echoid-s211" xml:space="preserve">Cor-
              <lb/>
            pus ipſum ideo eſt examinandum, hujuſque proprietates
              <lb/>
            exactiſſimè perpendendæ ſunt, ut poſſimus determinare
              <lb/>
            quid in rerum Phænomenis ex illis proprietatibus ſequa-
              <lb/>
            tur.</s>
            <s xml:id="echoid-s212" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s213" xml:space="preserve">Corpus majori cum cura examinando, videmus quaſ-
              <lb/>
            dam leges dari generales, ſecundum quas corpora moven-
              <lb/>
            tur. </s>
            <s xml:id="echoid-s214" xml:space="preserve">Corpus motum in motu continuare: </s>
            <s xml:id="echoid-s215" xml:space="preserve">actioni ſemper
              <lb/>
            æqualem eſſe & </s>
            <s xml:id="echoid-s216" xml:space="preserve">contrariam reactionem extra omne du-
              <lb/>
            bium eſt. </s>
            <s xml:id="echoid-s217" xml:space="preserve">Variæque aliæ ſimiles circa Corpus deteguntur
              <lb/>
            Leges, quæ minime ex proprietatibus, quæ ipſum Cor-
              <lb/>
            pus conſtituere dicuntur, deduci poſſunt; </s>
            <s xml:id="echoid-s218" xml:space="preserve">cumque hæ
              <lb/>
            Leges ſemper, id eſt, in omnibus occaſionibus, & </s>
            <s xml:id="echoid-s219" xml:space="preserve">ubi-
              <lb/>
            que, obtineant, & </s>
            <s xml:id="echoid-s220" xml:space="preserve">omnia corpora iis ſubjiciantur, pro
              <lb/>
            generalibus Naturæ Legibus habendæ ſunt. </s>
            <s xml:id="echoid-s221" xml:space="preserve">Circa has
              <lb/>
            in obſcuro eſt, an ex materiæ eſſentia fluant; </s>
            <s xml:id="echoid-s222" xml:space="preserve">an dedu-
              <lb/>
            cendæ ſint ex proprietatibus corporibus, ex quibus conſtat
              <lb/>
            Mundus, a DEO tributis, ſed Corpori minime eſſentialibus;
              <lb/>
            </s>
            <s xml:id="echoid-s223" xml:space="preserve">tandem an non pendeant effectus, qui pro Naturæ Legibus
              <lb/>
            habentur, a caufis extraneis nobis nequidem ideis attingen-
              <lb/>
            dis.</s>
            <s xml:id="echoid-s224" xml:space="preserve"/>
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