Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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          <head xml:id="echoid-head11" style="it" xml:space="preserve">Epiſtola; in qua Operis hujus Argumen-
            <lb/>
          tum, & ſcopus brevitèr
            <lb/>
          exponuntur.</head>
          <p>
            <s xml:id="echoid-s57" xml:space="preserve">PErcontaris (amice cum primis chariſſimè) quid in
              <lb/>
            Lectionibus iſtis jam prælo ſubditis præſtiterim, aut
              <lb/>
            præſtare voluerim. </s>
            <s xml:id="echoid-s58" xml:space="preserve">reſponſo facilè defungi poſſem,
              <lb/>
            ea dicendo præſtita videri, quæ ſingularum initia
              <lb/>
            pollicentur, è quibus inſequentium methodus, materiâ,
              <lb/>
            ſcopus conſtare poterunt ipsâ delibanti. </s>
            <s xml:id="echoid-s59" xml:space="preserve">verùm in ſummam,
              <lb/>
            opinor, iſta contrahivis, & </s>
            <s xml:id="echoid-s60" xml:space="preserve">ſub unum aſpectum redigi. </s>
            <s xml:id="echoid-s61" xml:space="preserve">id
              <lb/>
            quidem ægrè poſſum, niſi (quod juxtà faſtidioſum ac
              <lb/>
            longum eſſet) complura _Tbeoremata_ recitando; </s>
            <s xml:id="echoid-s62" xml:space="preserve">ſed ut-
              <lb/>
            cunque morem tibi geram, rerum capita ſuccinctè per-
              <lb/>
            ſtringens. </s>
            <s xml:id="echoid-s63" xml:space="preserve">Generatim eò connitor, ut illam, quam tra-
              <lb/>
            ctandam ſuſcipio, _Opticæ_ partem aliquatenùs promoveam,
              <lb/>
            ejus imprimìs principia explicando; </s>
            <s xml:id="echoid-s64" xml:space="preserve">tum ab ipſis _Vtilia_
              <lb/>
            _Conſectaria_ deducendo; </s>
            <s xml:id="echoid-s65" xml:space="preserve">demùm præcipuos (quos animad-
              <lb/>
            verteram) defectus ſupplendo, nec non _vulgatos errores_
              <lb/>
            corrigendo. </s>
            <s xml:id="echoid-s66" xml:space="preserve">huc collimans, ſpeciatim primò receptas hy-
              <lb/>
            potheſes ad examen revoco, quatenus admittendæ ſunt
              <lb/>
            & </s>
            <s xml:id="echoid-s67" xml:space="preserve">quomodò rectiùs intelligendæ edocere ſtudens; </s>
            <s xml:id="echoid-s68" xml:space="preserve">tum è
              <lb/>
            phyſicis ueriſimilibus cauſis ipſas eliciens ac aſtruens. </s>
            <s xml:id="echoid-s69" xml:space="preserve">quâ
              <lb/>
            in parte mihi fidei multum attribui nolim; </s>
            <s xml:id="echoid-s70" xml:space="preserve">quæ probabi-
              <lb/>
            liora mihi viſa protuli, neutiquam verò talia, quibus ipſe
              <lb/>
            magnopere conſidam. </s>
            <s xml:id="echoid-s71" xml:space="preserve">valeant quantum valere poſſunt.
              <lb/>
            </s>
            <s xml:id="echoid-s72" xml:space="preserve">Saltem hypotheſes ipſas admitti peto, ceu experientiæ
              <lb/>
            conſentaneas, nec à ratione quaquàm abhorrentes. </s>
            <s xml:id="echoid-s73" xml:space="preserve">
              <lb/>
            Hypotheſibus conſtitutis, ab iis proximè </s>
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