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

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            cujuſcunque generis ſcientia, qualitercunque declarare ſtuduimus, & </s>
            <s xml:id="echoid-s787" xml:space="preserve">
              <lb/>
            è principiis admodum affinibus elicere; </s>
            <s xml:id="echoid-s788" xml:space="preserve">modo, meâ ſententiâ ſaltem,
              <lb/>
            omnium qui legenti ſe vel cogitanti ſuggeſſerunt, ſimillimo veri, cúm-
              <lb/>
            que tam rationibus Mechanicis, quàm experimentis Phyſicis, & </s>
            <s xml:id="echoid-s789" xml:space="preserve">cùm
              <lb/>
            ipſa rerum natura congruentiſſimo. </s>
            <s xml:id="echoid-s790" xml:space="preserve">Neque nulla mihi tunc oborieba-
              <lb/>
            tur voluptas, cùm poſtquam inter alios iſta lucis ſymptomata expli-
              <lb/>
            candi modos hic ipſe ſemet ingeſſerat, eum examini ſubjiciens, Geo-
              <lb/>
            metriæ legibus (aliquanto ſanè præter expectationem) adeo quadran-
              <lb/>
            tem comperiſſem. </s>
            <s xml:id="echoid-s791" xml:space="preserve">Meæ tamen eum tam fuſe4; </s>
            <s xml:id="echoid-s792" xml:space="preserve">diducendi peperciffem
              <lb/>
            operæ, ſi quæ doctiſſimus _Maignanus_ hiſce conformia, luculentius
              <lb/>
            quidem opinor & </s>
            <s xml:id="echoid-s793" xml:space="preserve">accuratius, pertractavit, priuſquam hæc aggrederer
              <lb/>
            contigiſſet inſpexiſſe; </s>
            <s xml:id="echoid-s794" xml:space="preserve">penes quem extare multa nil dubitem (nec enim
              <lb/>
            eum adhuc curioſiùs evolvi) ſupplendis his, & </s>
            <s xml:id="echoid-s795" xml:space="preserve">confirmandis accommo-
              <lb/>
            data. </s>
            <s xml:id="echoid-s796" xml:space="preserve">Porro fuit etiam animus, alias, quæ plurimæ traduntur, horum
              <lb/>
            rationes percenſere, ac perſtringere (quarum mihi nonnullæ craſſâ
              <lb/>
            petitione laborare; </s>
            <s xml:id="echoid-s797" xml:space="preserve">multùm aliæ à re propoſita abludere; </s>
            <s xml:id="echoid-s798" xml:space="preserve">quædam
              <lb/>
            animum ſubtilitate potius confundere, quàm vi conſtringere videban-
              <lb/>
            tur) verùm etiam huic exponendæ nimiſquam immoratus, hactenus in-
              <lb/>
            ſinuatis contentus, omnes tranſiliam; </s>
            <s xml:id="echoid-s799" xml:space="preserve">illius ſaltem eruditiſſimi viri
              <lb/>
            nefas fuerit non aſtipulari penitus, & </s>
            <s xml:id="echoid-s800" xml:space="preserve">acquieſcere decreto; </s>
            <s xml:id="echoid-s801" xml:space="preserve">“qui, De-
              <lb/>
            "um unicum & </s>
            <s xml:id="echoid-s802" xml:space="preserve">Optimum Naturæ Architectum, hanc (ait) legem ra-
              <lb/>
            "diis diverſa media permeantibus præſcripſiſſe; </s>
            <s xml:id="echoid-s803" xml:space="preserve">ut omnes omnino
              <lb/>
            "radii veri, & </s>
            <s xml:id="echoid-s804" xml:space="preserve">apparentes eandem ſemper inter ſe ſervent analogiam.
              <lb/>
            </s>
            <s xml:id="echoid-s805" xml:space="preserve">His, inquam, dimiſſis, ſuccedit ut è præſtructis emanantia quædam
              <lb/>
            Poriſmata ſubnectamus.</s>
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