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-head12" xml:space="preserve">Lect. I.</head>
          <p>
            <s xml:id="echoid-s179" xml:space="preserve">I. </s>
            <s xml:id="echoid-s180" xml:space="preserve">PRæfatorio jam vinculo ſolutus, & </s>
            <s xml:id="echoid-s181" xml:space="preserve">ſcopulum præterve-
              <lb/>
              <note position="right" xlink:label="note-0019-01" xlink:href="note-0019-01a" xml:space="preserve">_Præceſſerat an_-
                <lb/>
              _teloquium oc_-
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              _caſioni, quæ_
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              _fui@, adap@a_-
                <lb/>
              _tum_.</note>
            ctus Rhetoricum, ad muneris mei proprium opus ac-
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            cingor. </s>
            <s xml:id="echoid-s182" xml:space="preserve">Imprimis autem novi quod inîerim conſilii
              <lb/>
            rationem, paucis expediam. </s>
            <s xml:id="echoid-s183" xml:space="preserve">Cum prius inſtitutum ur-
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            gens adverterim, occurrere pleraque nimiam attentio-
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            nem deſiderantia, nec ex improviſo auſcultantibus, in-
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            dè ſatis opportuna; </s>
            <s xml:id="echoid-s184" xml:space="preserve">incommodum etiam illud à puram Geometriam
              <lb/>
            attrectantibus haud poſſe declinari; </s>
            <s xml:id="echoid-s185" xml:space="preserve">conſtitui, derelictâ tantiſper
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            iſtâ, protinus in amæniores (floribus nempe Phyſicis depicto, & </s>
            <s xml:id="echoid-s186" xml:space="preserve">
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            fructibus conſitos Mechanicis) mixtæ quam appellitant Matheſeos
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            Campos deviare; </s>
            <s xml:id="echoid-s187" xml:space="preserve">Opticæ nimirum, Mechanicæ, Coſmographiæ, re-
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            liquæ cujuſcunque, prout occaſio feret, & </s>
            <s xml:id="echoid-s188" xml:space="preserve">commodum videbitur. </s>
            <s xml:id="echoid-s189" xml:space="preserve">Ne-
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            que tamen animus erit ullius ex his longè diffuſa latifundia pervagari,
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            vel extremos fines circumire; </s>
            <s xml:id="echoid-s190" xml:space="preserve">ſed ad ejus quaſi metropolim è veſtigio
              <lb/>
            rectà procedere; </s>
            <s xml:id="echoid-s191" xml:space="preserve">primas tantum hypotheſes excutere, præcipuáque
              <lb/>
            (quibus illa tam vaſta theorematum moles incumbit) fundamenta de-
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            nudare; </s>
            <s xml:id="echoid-s192" xml:space="preserve">tum verò nonnulla, palmaria quidem illa, ſtatim emergentia
              <lb/>
            corollaria ſubtexere. </s>
            <s xml:id="echoid-s193" xml:space="preserve">Quorum certè σκέψις jucunda praſ@r@im, utilis,
              <lb/>
            & </s>
            <s xml:id="echoid-s194" xml:space="preserve">fructuoſa videri poteſt; </s>
            <s xml:id="echoid-s195" xml:space="preserve">quum è principiis rectè poſitis, probéque
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            perceptis reliquorum & </s>
            <s xml:id="echoid-s196" xml:space="preserve">firma fides, & </s>
            <s xml:id="echoid-s197" xml:space="preserve">facilis comprehenſio ſub-
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            naſcantur.</s>
            <s xml:id="echoid-s198" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s199" xml:space="preserve">II. </s>
            <s xml:id="echoid-s200" xml:space="preserve">Ab Optica ſumemus exordium; </s>
            <s xml:id="echoid-s201" xml:space="preserve">ſcientia cum primis Nobili;
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            </s>
            <s xml:id="echoid-s202" xml:space="preserve">quam cum peculiaris amænitas, tum ingens commendat utilitas. </s>
            <s xml:id="echoid-s203" xml:space="preserve">Nam
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            Naturæ ſimul detegendis arcanis, ac explicandis Phænomenis minimè
              <lb/>
            vos latet quantopere conducat; </s>
            <s xml:id="echoid-s204" xml:space="preserve">neque minus ad Aſtronomicas rationes
              <lb/>
            quàm planè neceſſaria ſit; </s>
            <s xml:id="echoid-s205" xml:space="preserve">ut Perſpectivam, Picturam, & </s>
            <s xml:id="echoid-s206" xml:space="preserve">his agnatas
              <lb/>
            alias eximias Artes taceam; </s>
            <s xml:id="echoid-s207" xml:space="preserve">quæ quantæ quantæ ſunt ab ea pendent,
              <lb/>
            ac prineipia ſua mutuantur. </s>
            <s xml:id="echoid-s208" xml:space="preserve">Ut & </s>
            <s xml:id="echoid-s209" xml:space="preserve">præteream qualia, certè vix </s>
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