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

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          <p>
            <s xml:id="echoid-s5550" xml:space="preserve">
              <pb o="86" file="0104" n="104" rhead=""/>
            Quia corpus bene terſum luci Splendidæ expoſitum albeſcit; </s>
            <s xml:id="echoid-s5551" xml:space="preserve">Quo-
              <lb/>
            niam alba difficiliùs ignem concipiunt; </s>
            <s xml:id="echoid-s5552" xml:space="preserve">Quòd humore tenuiore vacua-
              <lb/>
            ta corpora (_Capilli, Polia, Cineres) canitiem_ acquirunt; </s>
            <s xml:id="echoid-s5553" xml:space="preserve">Quibus & </s>
            <s xml:id="echoid-s5554" xml:space="preserve">
              <lb/>
            frigore conſtricta accenſeri poſſent.</s>
            <s xml:id="echoid-s5555" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5556" xml:space="preserve">_Nigrum_ eſt, quod lucem minimè, vel parciſimè refundit. </s>
            <s xml:id="echoid-s5557" xml:space="preserve">talia ple-
              <lb/>
            runque ſunt corpora valdè pellucida; </s>
            <s xml:id="echoid-s5558" xml:space="preserve">nec non quæ crebros meatus,
              <lb/>
            & </s>
            <s xml:id="echoid-s5559" xml:space="preserve">cavernulas lucem abſorbentes habent. </s>
            <s xml:id="echoid-s5560" xml:space="preserve">Hoc indicat, Quod omnes
              <lb/>
            _Umbrœ nigrœ apparent; </s>
            <s xml:id="echoid-s5561" xml:space="preserve">Quod Aqua, Vitrum, Nubes_ ad hunc colo-
              <lb/>
            rem vergunt; </s>
            <s xml:id="echoid-s5562" xml:space="preserve">Quod _nigra_ faciliùs ignem imbibunt, calefiunt, com-
              <lb/>
            buruntur; </s>
            <s xml:id="echoid-s5563" xml:space="preserve">Quòd longiùs diſſita (quorum ſenſim intercipitur, & </s>
            <s xml:id="echoid-s5564" xml:space="preserve">amit-
              <lb/>
            titur lux) obſcuriora videntur.</s>
            <s xml:id="echoid-s5565" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5566" xml:space="preserve">_Rubrum eſt_, quod lucem eſſundit hinc indè confertam, ac ſolito
              <lb/>
              <note position="left" xlink:label="note-0104-01" xlink:href="note-0104-01a" xml:space="preserve">@ Lat.
                <lb/>
              Fig. 128.</note>
            magìs conſtipatam, aſt interſtitiis umbroſis diremptam, & </s>
            <s xml:id="echoid-s5567" xml:space="preserve">interruptam.
              <lb/>
            </s>
            <s xml:id="echoid-s5568" xml:space="preserve">talia concipi poſſunt corpora, multas intra ſe quaſi _fornaculas & </s>
            <s xml:id="echoid-s5569" xml:space="preserve">focos_
              <lb/>
            habentia (qualia X, è _Speculis cavis_ contextum; </s>
            <s xml:id="echoid-s5570" xml:space="preserve">& </s>
            <s xml:id="echoid-s5571" xml:space="preserve">Y è _Sphœrulis_,
              <lb/>
            tranſmiſſam lucem ad totidem _focas_ cogentibus, conſtans). </s>
            <s xml:id="echoid-s5572" xml:space="preserve">Argu-
              <lb/>
            mento ſit, Quòd à _Speculis, & </s>
            <s xml:id="echoid-s5573" xml:space="preserve">vitris uſtoriis_ collecta lux rubeſcit; </s>
            <s xml:id="echoid-s5574" xml:space="preserve">
              <lb/>
            Quòd corpora denſa ignita (quippe quorum cellæ luce ſpiſsâ refer-
              <lb/>
            ciuntur) rubra videntur; </s>
            <s xml:id="echoid-s5575" xml:space="preserve">Quòd roſcida nubes Soli (matutino, vel
              <lb/>
            veſpertino) expoſita rubet; </s>
            <s xml:id="echoid-s5576" xml:space="preserve">Quòd eroſio rubiginem parit.</s>
            <s xml:id="echoid-s5577" xml:space="preserve">‖ Ad
              <lb/>
            rubri naturam fortaſſe pertinet, quòd compreſſa lux languidiùs emicat.</s>
            <s xml:id="echoid-s5578" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5579" xml:space="preserve">_Cœruleum_ eſt quod lucem raram, aut impetu ſegniore concitatam
              <lb/>
            emittit. </s>
            <s xml:id="echoid-s5580" xml:space="preserve">talia videntur eſſe corpora, quæ particulis conſtant albis ac
              <lb/>
            atris alternatim diſpoſitis; </s>
            <s xml:id="echoid-s5581" xml:space="preserve">ſed & </s>
            <s xml:id="echoid-s5582" xml:space="preserve">hunc ſubinde colorem oſtentant can-
              <lb/>
            dida maligniùs illuſtrata. </s>
            <s xml:id="echoid-s5583" xml:space="preserve">Exemplo ſint, _Æther Sudus_ (in quo
              <lb/>
            nempe pauciora natant corpuſcula lucem ad oculos reverberantia, cæ-
              <lb/>
            terâ luce dilabente) _Mare_, ſale candido nimirum & </s>
            <s xml:id="echoid-s5584" xml:space="preserve">humore pellu-
              <lb/>
            cido conſtans; </s>
            <s xml:id="echoid-s5585" xml:space="preserve">Umbra corporis cujuſvis opaci, de die, ad lucernam
              <lb/>
            ardentem facta, & </s>
            <s xml:id="echoid-s5586" xml:space="preserve">ad chartam albam excepta ſeu terminata; </s>
            <s xml:id="echoid-s5587" xml:space="preserve">(nempe
              <lb/>
            corporis AB ad chartam XY violacea depingitur umbra, à lucerna C).</s>
            <s xml:id="echoid-s5588" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5589" xml:space="preserve">_Viride_ cæruleo perquàm agnatum eſt. </s>
            <s xml:id="echoid-s5590" xml:space="preserve">_Diſcrimen_ explorent ſaga-
              <lb/>
              <note position="left" xlink:label="note-0104-02" xlink:href="note-0104-02a" xml:space="preserve">@ Lat.
                <lb/>
              Fig. 128.</note>
            ciores; </s>
            <s xml:id="echoid-s5591" xml:space="preserve">ego non auſim ariolari.</s>
            <s xml:id="echoid-s5592" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5593" xml:space="preserve">Cæterùm reliqua colorata ex iſtis variè commixtis, atque contem-
              <lb/>
            peratis emergunt; </s>
            <s xml:id="echoid-s5594" xml:space="preserve">ut _flavum_ ex albo copioſo, rubríque nonnihillo in-
              <lb/>
            terſperſo; </s>
            <s xml:id="echoid-s5595" xml:space="preserve">_purputeum_ ex multo cæruleo, rubríque tantillo, &</s>
            <s xml:id="echoid-s5596" xml:space="preserve">c. </s>
            <s xml:id="echoid-s5597" xml:space="preserve">Ve-
              <lb/>
            rùm ſuſficiat hâctenus, iſta ſupra captum noſtrum poſita Scrutantes;
              <lb/>
            </s>
            <s xml:id="echoid-s5598" xml:space="preserve">nos illis, quiàηιολογſicas pbyſicas moroſiùs excipiunt, deridendos pro-
              <lb/>
            pinaſſe.</s>
            <s xml:id="echoid-s5599" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5600" xml:space="preserve">Sufficient hæc pro radiis parallelis; </s>
            <s xml:id="echoid-s5601" xml:space="preserve">ad divergentes ordine proce-
              <lb/>
            dendum eſt; </s>
            <s xml:id="echoid-s5602" xml:space="preserve">aſt interpoſitâ morâ, nè vix exorſi cogamur abrumpere.</s>
            <s xml:id="echoid-s5603" xml:space="preserve">‖</s>
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