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

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            <s xml:id="echoid-s266" xml:space="preserve">
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            majuſculis, & </s>
            <s xml:id="echoid-s267" xml:space="preserve">aliquatenus ſtabilem ſuarum partium ſitum retinentibus
              <lb/>
            (pro varia particularum, è quibus illa componuntur, figura, diſpoſiti-
              <lb/>
            one, textura, hoc vel illo modo) detorta, vel utcunque repercuſſa;
              <lb/>
            </s>
            <s xml:id="echoid-s268" xml:space="preserve">nimirum ut ejuſmodi corporibus illapſa lux vel motu ſuo, vel agendi
              <lb/>
            virtute, vel ipſâ quantitate ſuâ (quoad raritatem intelligo, vel denſita-
              <lb/>
            tem; </s>
            <s xml:id="echoid-s269" xml:space="preserve">radiorum copiam, aut paucitatem) talis evadat, & </s>
            <s xml:id="echoid-s270" xml:space="preserve">pro modi
              <lb/>
            diſcrimine diſpares procreet apparentias, à quibus eam variis colorum
              <lb/>
            nominibus inſignimus. </s>
            <s xml:id="echoid-s271" xml:space="preserve">Imagines autem nil planè ſunt aliud, quum
              <lb/>
            lux ab objectis ita reflexa, vel refracta, ut rurſus in unum locum, ta-
              <lb/>
            lémque recolligatur ſitum, qualem tunc obtinuit, quum ab originali
              <lb/>
            proflueret objecto; </s>
            <s xml:id="echoid-s272" xml:space="preserve">directóque verſus oculum itinere procederet; </s>
            <s xml:id="echoid-s273" xml:space="preserve">quo
              <lb/>
            fit ut ſimiliter objecta, ſed tanquam alibi collocata repræſentent. </s>
            <s xml:id="echoid-s274" xml:space="preserve">
              <lb/>
            Phaſmata deníque ſunt imaginum quaſi colores, pro lucis diverſa me-
              <lb/>
            dia trajicientis alia ac alia quoad motum, vim, quantitatem affectione
              <lb/>
            diverſa variati Craſſiuſculè jam iſta proponimus; </s>
            <s xml:id="echoid-s275" xml:space="preserve">quorum forſan ali-
              <lb/>
            qua ſaltem in dicendorum progreſſu magis eluceſcent.</s>
            <s xml:id="echoid-s276" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s277" xml:space="preserve">VI. </s>
            <s xml:id="echoid-s278" xml:space="preserve">Cùm itáque lux in viſione peragenda, diverſiſque procreandis
              <lb/>
            apparentiis ità quaſi paginam utramque faciat; </s>
            <s xml:id="echoid-s279" xml:space="preserve">Et reverà præter illam
              <lb/>
            nil aliud ſenſum ingredi, vel commovere videatur; </s>
            <s xml:id="echoid-s280" xml:space="preserve">de illa primo diſpi-
              <lb/>
            ciendum venit. </s>
            <s xml:id="echoid-s281" xml:space="preserve">Et ejuſce quidem de natura à Phyſicis magnoperè
              <lb/>
            deſceptatur; </s>
            <s xml:id="echoid-s282" xml:space="preserve">an puta ſit corporea quædam ſubſtantia, an qualitas; </s>
            <s xml:id="echoid-s283" xml:space="preserve">an
              <lb/>
            actio tantùm, aut motus quidam; </s>
            <s xml:id="echoid-s284" xml:space="preserve">de productione quoque conſequen-
              <lb/>
            tèr ejuſdem, & </s>
            <s xml:id="echoid-s285" xml:space="preserve">propagatione diſquiritur, utrùm continuo per medium
              <lb/>
            tranſitu, vel medii duntaxat impulſu, vel ſuâ ipſius multiplicatione
              <lb/>
            quâdam huc propagetur; </s>
            <s xml:id="echoid-s286" xml:space="preserve">quales ego quæſtiones curioſè non eventilabo.
              <lb/>
            </s>
            <s xml:id="echoid-s287" xml:space="preserve">Quod iſtam ſaltem ſententiam attinet, quæ lucem accidentium claſſi
              <lb/>
            accenſet; </s>
            <s xml:id="echoid-s288" xml:space="preserve">quando veris corporeis effectibus quales ſunt rectâ progredi,
              <lb/>
            repercnti, refringi, calorem excitare, ſenſum afficere) veræ ſubliſten-
              <lb/>
            tes cauſæ, veri locales motus aſſignari debeant; </s>
            <s xml:id="echoid-s289" xml:space="preserve">neque quomodò meræ
              <lb/>
            qualitati, vel accidenti cuipiam iſta competant intelligere mihi datum
              <lb/>
            ſit; </s>
            <s xml:id="echoid-s290" xml:space="preserve">quinetiam quo ſeſe pacto multiplicare valeat, id genus entium,
              <lb/>
            quâ ratione vim ullam exerere, cùm è cordatioribus & </s>
            <s xml:id="echoid-s291" xml:space="preserve">rerum intima
              <lb/>
            perſerutantibus Philoſophis haud pauci ſe parùm capere profiteantur; </s>
            <s xml:id="echoid-s292" xml:space="preserve">
              <lb/>
            eam haud dubitem hîc miſſam facere. </s>
            <s xml:id="echoid-s293" xml:space="preserve">Verùm an corporeæ quædam
              <lb/>
            άπόῤῥοι{αι}, de lucidi corporis viſceribus emanantes, totúmque nobis & </s>
            <s xml:id="echoid-s294" xml:space="preserve">
              <lb/>
            ipſi interjectum ſpatium quàm perniciſſimè tranſcurrentes lucem con-
              <lb/>
            ſtituant; </s>
            <s xml:id="echoid-s295" xml:space="preserve">vel an illa potius nihil ſit aliud quàm ipſius lucentis actio,
              <lb/>
            contigua ſibi corpora prementis ac impellentis, iíſque mediantibus
              <lb/>
            alia, quæ adjacent; </s>
            <s xml:id="echoid-s296" xml:space="preserve">tum & </s>
            <s xml:id="echoid-s297" xml:space="preserve">horum interceſſu rurſus alia proximè </s>
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