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-s297" xml:space="preserve">
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            cedentia; </s>
            <s xml:id="echoid-s298" xml:space="preserve">nec non ità perpetuâ deinceps ad nos deductâ ſerie; </s>
            <s xml:id="echoid-s299" xml:space="preserve">vix au-
              <lb/>
            ſim certè mihi dijudicandum accipere; </s>
            <s xml:id="echoid-s300" xml:space="preserve">adeò paribus u@raque pars ar-
              <lb/>
            gumentis niti videtur, æquis utraque difficultatibus urgeri. </s>
            <s xml:id="echoid-s301" xml:space="preserve">Quin eo
              <lb/>
            fere propendeo, ut cenſeam utroque ſubinde modo lucem procreari,
              <lb/>
            tam per effluvia corporea, quàm per continuum impulſum; </s>
            <s xml:id="echoid-s302" xml:space="preserve">ſatiúſque
              <lb/>
            fore nonnullos ejus effectus huic, alios illi tribuere. </s>
            <s xml:id="echoid-s303" xml:space="preserve">Sanè cùm ad
              <lb/>
            quantum intervallum undiquaque protenſum exiguæ lampadis flam-
              <lb/>
            mula ſe vividè conſpiciendam præbeat, adeò quidem ut integrum ejus
              <lb/>
            radiatione circumpolitum medium perfundi compleríque videatur,
              <lb/>
            animadverto; </s>
            <s xml:id="echoid-s304" xml:space="preserve">quomodo tantillum corpus tali tamdiu ſuppeditandæ
              <lb/>
            profluviorum copiæ par ſit; </s>
            <s xml:id="echoid-s305" xml:space="preserve">quomodo dum ea profundit non ipſum
              <lb/>
            pluſquam exhauriatur, & </s>
            <s xml:id="echoid-s306" xml:space="preserve">confeſtim evaneſcat, haud facile capio.
              <lb/>
            </s>
            <s xml:id="echoid-s307" xml:space="preserve">Cum verò rurſus lucis inflectiones, illáſque qui conſequuntur effectus
              <lb/>
            cogito, vix animo meo nudus impulſus facit ſatis. </s>
            <s xml:id="echoid-s308" xml:space="preserve">Itaque mentis anxi-
              <lb/>
            us hæreo. </s>
            <s xml:id="echoid-s309" xml:space="preserve">Veruntamen quia de natura lucis aliquid præſternam expe-
              <lb/>
            dit, iis quas mox tradam hypotheſibus nonnihil explicandis congruum; </s>
            <s xml:id="echoid-s310" xml:space="preserve">
              <lb/>
            hoc ſe modo, vel non abſimili rem habere concipio.</s>
            <s xml:id="echoid-s311" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s312" xml:space="preserve">VII. </s>
            <s xml:id="echoid-s313" xml:space="preserve">Pono corpus omne lucidum, ut tale, congeriem eſſe quandam
              <lb/>
            corpuſculorum ultrà pene quàm cogitari poteſt minutorum & </s>
            <s xml:id="echoid-s314" xml:space="preserve">exilium;
              <lb/>
            </s>
            <s xml:id="echoid-s315" xml:space="preserve">horum autem unumquodque vehementiſſimo motu percitum, aliquò
              <lb/>
            (ſecundum legem iſtam naturæ ſatìs receptam & </s>
            <s xml:id="echoid-s316" xml:space="preserve">exploratam) rectà
              <lb/>
            tendere; </s>
            <s xml:id="echoid-s317" xml:space="preserve">tum medium circumſtare, fluidum quoque (cujus nempe
              <lb/>
            partes nullo colligatæ nexu quaquaverſùm liberè feruntur) è corpori-
              <lb/>
            bus aggregatum, exiliſſimis quidem & </s>
            <s xml:id="echoid-s318" xml:space="preserve">illis, aſt priorum reſpectu bene
              <lb/>
            craſſis & </s>
            <s xml:id="echoid-s319" xml:space="preserve">ſolidis; </s>
            <s xml:id="echoid-s320" xml:space="preserve">ità tamen ut hoc meatus habeat, & </s>
            <s xml:id="echoid-s321" xml:space="preserve">interſtitia tenui-
              <lb/>
            oribus illis admittendis opportuna; </s>
            <s xml:id="echoid-s322" xml:space="preserve">quin & </s>
            <s xml:id="echoid-s323" xml:space="preserve">horum craſſiorum corpuſ-
              <lb/>
            culorum occurſu progreſſum impediri multorum ex illis, quæ in lucidi
              <lb/>
            ſuperficie verſantur, aut ab ea ruunt corpuſculis; </s>
            <s xml:id="echoid-s324" xml:space="preserve">ut neceſſe ſit iis ſic
              <lb/>
            inhibitis, atque repulſis introrſum ſe recipere, quo fit ut dicta conge-
              <lb/>
            ries (aliis etiam in eam aliunde confluentibus ejuſdem naturæ corpuſcu-
              <lb/>
            lis) aliquatenus intra ſuos cancellos reſtringatur, nec toto ſtatim in au-
              <lb/>
            ras expanſa diſſipetur. </s>
            <s xml:id="echoid-s325" xml:space="preserve">Interim verò complura per dictos canales re-
              <lb/>
            pertâ viâ curſum ſuum rectà continuare, materiam inibi deprehenſam
              <lb/>
            haud ita foniter obſiſtentem in fugam agentia, & </s>
            <s xml:id="echoid-s326" xml:space="preserve">ante ſe protrudentia; </s>
            <s xml:id="echoid-s327" xml:space="preserve">
              <lb/>
            quorum veſtigiis alia de lucido corpore ſimiliter prodeuntia prorſus
              <lb/>
            inſiſtent, longúmque ſimul omnia lucis rivulum efficient, indeflexâ
              <lb/>
            ſerie procurrentem. </s>
            <s xml:id="echoid-s328" xml:space="preserve">Quin & </s>
            <s xml:id="echoid-s329" xml:space="preserve">iſtorum fortè nonnulla memoratas me-
              <lb/>
            dii craſſiores particulas impetu ferire tam prævalido, nonnunquam ut
              <lb/>
            ipſas quoque cedere cogant, & </s>
            <s xml:id="echoid-s330" xml:space="preserve">ſecum conſpirantes in directum </s>
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