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

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            quibus retina conſtat, agitantur; </s>
            <s xml:id="echoid-s13895" xml:space="preserve">qua agitatione ideæ obje-
              <lb/>
            ctorum, in oculo depictorum, in mente excitantur. </s>
            <s xml:id="echoid-s13896" xml:space="preserve">Nexus in-
              <lb/>
            ter ideas & </s>
            <s xml:id="echoid-s13897" xml:space="preserve">motus quibus excitantur, ut ante dictum ,
              <note symbol="*" position="left" xlink:label="note-0544-01" xlink:href="note-0544-01a" xml:space="preserve">502.</note>
            latet: </s>
            <s xml:id="echoid-s13898" xml:space="preserve">in cauſis ſenſationum determinandis, non ultra ner-
              <lb/>
            vorum agitationes penetrare poſiumus.</s>
            <s xml:id="echoid-s13899" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13900" xml:space="preserve">Quo pictura memorat a magis eſt exacta, quo objecta diſtin-
              <lb/>
              <note position="left" xlink:label="note-0544-02" xlink:href="note-0544-02a" xml:space="preserve">717.</note>
            ctius apparent. </s>
            <s xml:id="echoid-s13901" xml:space="preserve">Quando radii ab eodem puncto manantes
              <lb/>
              <note position="left" xlink:label="note-0544-03" xlink:href="note-0544-03a" xml:space="preserve">718.</note>
            non exactè in retinâ junguntur, illius pictura non eſt pun-
              <lb/>
            ctum ſed macula, quæ confunditur cum picturis punctorum
              <lb/>
            vicinorum; </s>
            <s xml:id="echoid-s13902" xml:space="preserve">in quo caſu viſio confuſa eſt.</s>
            <s xml:id="echoid-s13903" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13904" xml:space="preserve">Cùm autem, pro varíâ puncti radiantis diſtantiâ, hujus
              <lb/>
              <note position="left" xlink:label="note-0544-04" xlink:href="note-0544-04a" xml:space="preserve">719.</note>
            focus magis aut minus removeatur , neceſſe eſt, ut
              <note symbol="*" position="left" xlink:label="note-0544-05" xlink:href="note-0544-05a" xml:space="preserve">663.</note>
            detur in oculo, ne locus in quo pictura eſt exacta, ante aut
              <lb/>
            poſt retinam cadat, & </s>
            <s xml:id="echoid-s13905" xml:space="preserve">viſio confuſa ſit.</s>
            <s xml:id="echoid-s13906" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13907" xml:space="preserve">Quænam autem hæc ſit mutatio difficulter admodum de-
              <lb/>
            terminatur, variæque dantur Philoſophorum ſententiæ; </s>
            <s xml:id="echoid-s13908" xml:space="preserve">cir-
              <lb/>
            ca quas in genere notabo, minimè probabile eſſe totius oculi
              <lb/>
              <note position="left" xlink:label="note-0544-06" xlink:href="note-0544-06a" xml:space="preserve">720.</note>
            figuram mutari, ad removendam aut admovendam retinam,
              <lb/>
            & </s>
            <s xml:id="echoid-s13909" xml:space="preserve">in interiori oculo mutationem quærendam eſſe.</s>
            <s xml:id="echoid-s13910" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13911" xml:space="preserve">Nam ſi figura oculi mutaretur, cùm in omnibus Animali-
              <lb/>
            bus æquè neceſſaria ſit mutatio de qua agitur, in omnibus
              <lb/>
            animalibus oculi figura eaſdem ſubibit mutationes; </s>
            <s xml:id="echoid-s13912" xml:space="preserve">ejuſdem
              <lb/>
            enim effectus cauſas varias in rerum natura non deprehen-
              <lb/>
            dimus. </s>
            <s xml:id="echoid-s13913" xml:space="preserve">In Balenâ verò ſclerotica nimium eſt dura, ut va-
              <lb/>
            riationi obnoxia ſit. </s>
            <s xml:id="echoid-s13914" xml:space="preserve">Ulterius, ſi talis detur mutatio in toto
              <lb/>
            oculo, orietur hæc ex muſculorum externorum preſſione,
              <lb/>
            quæ pro variò oculi ſitu diverſa erit, & </s>
            <s xml:id="echoid-s13915" xml:space="preserve">tantum regularis in
              <lb/>
            unico oculi ſitu.</s>
            <s xml:id="echoid-s13916" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13917" xml:space="preserve">Si nunc oculum in interiori examinemus, mutationem in
              <lb/>
            cryſtallino neceſſariò dari patebit; </s>
            <s xml:id="echoid-s13918" xml:space="preserve">qui tranſlatione in ocu-
              <lb/>
            lo, aut mutatione figuræ, deſideratum effectum præſtabit;
              <lb/>
            </s>
            <s xml:id="echoid-s13919" xml:space="preserve">Radii enim retinam ante concurſum ſecantes, in retinâ con-
              <lb/>
            current, ſi convexior fiat cryſtallinus humor , aut ſi,
              <note symbol="*" position="left" xlink:label="note-0544-07" xlink:href="note-0544-07a" xml:space="preserve">695.</note>
            vatâ hujus figurâ, ipſe magis verſus anteriorem oculi partem
              <lb/>
            feratur.</s>
            <s xml:id="echoid-s13920" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13921" xml:space="preserve">Cryſtallini humoris ſitum facile mutari, illumque ad reti-
              <lb/>
              <note position="left" xlink:label="note-0544-08" xlink:href="note-0544-08a" xml:space="preserve">721.</note>
            nam accedere & </s>
            <s xml:id="echoid-s13922" xml:space="preserve">ab hac recedere, manente illius axe, ex </s>
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