Ibn-al-Haitam, al-Hasan Ibn-al-Hasan; Witelo; Risner, Friedrich, Opticae thesavrvs Alhazeni Arabis libri septem, nunc primùm editi. Eivsdem liber De Crepvscvlis & Nubium ascensionibus. Item Vitellonis Thuvringopoloni Libri X. Omnes instaurati, figuris illustrati & aucti, adiectis etiam in Alhazenum commentarijs, a Federico Risnero, 1572

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        <div xml:id="echoid-div52" type="section" level="0" n="0">
          <p>
            <s xml:id="echoid-s1451" xml:space="preserve">
              <pb o="24" file="0030" n="30" rhead="ALHAZEN"/>
            fixione, ſecundum illud, quod eſt in ea de ſpiſsitudine, & pertranſibit in ea ſecũdum ſuam diapha-
              <lb/>
            nitatem, & erit ex ea, forma in aere ſecundum colorem & lucem, quæ ſunt in ſua ſuperficie:</s>
            <s xml:id="echoid-s1452" xml:space="preserve"> & cum
              <lb/>
            illa forma peruenerit ad uiſum, operabitur in uiſum, & ſentiet uiſus illã rem uiſam.</s>
            <s xml:id="echoid-s1453" xml:space="preserve"> Et propter iſtam
              <lb/>
            cauſſam non comprehendit uiſus ex rebus uiſibilibus, niſi quãdo ipſum uiſibile fuerit denſum, aut
              <lb/>
            fuerit in eo aliquid denſitatis.</s>
            <s xml:id="echoid-s1454" xml:space="preserve"> Iam ergo declaratę ſunt cauſſæ, propter quas nihil comprehendit ui-
              <lb/>
            ſus, niſi quãdo fuerint aggregatæ intentiones prædictæ.</s>
            <s xml:id="echoid-s1455" xml:space="preserve"> Et hoc, quod declarauimus, eſt illud, quod
              <lb/>
            intendimus declarare in iſto tractatu.</s>
            <s xml:id="echoid-s1456" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div53" type="section" level="0" n="0">
          <head xml:id="echoid-head74" xml:space="preserve">ALHAZEN FILII</head>
          <head xml:id="echoid-head75" xml:space="preserve">ALHAYZEN OPTICAE</head>
          <head xml:id="echoid-head76" xml:space="preserve">LIBER SECVNDVS.</head>
          <p style="it">
            <s xml:id="echoid-s1457" xml:space="preserve">DECLARATVM eſt qualiter fiat uiſio:</s>
            <s xml:id="echoid-s1458" xml:space="preserve"> & eſt qualit{as} ſenſus uiſ{us} à forma
              <lb/>
            lucis & coloris, quæ ſunt in re uiſa, ordinatorum ita, ſicut ſunt in ſuperficie
              <lb/>
            rei uiſæ.</s>
            <s xml:id="echoid-s1459" xml:space="preserve"> Viſ{us} autem comprehendit ex reb{us} uiſibilib{us} mult{as} intentio-
              <lb/>
            nes præter lucem & colorem.</s>
            <s xml:id="echoid-s1460" xml:space="preserve"> Et etiam declaratum eſt in primo tractatu
              <lb/>
            [18 n] quòd uiſio non ſit, niſi ex uerticationib{us} linearum radialium:</s>
            <s xml:id="echoid-s1461" xml:space="preserve"> & lineæ radia-
              <lb/>
            les diuerſentur in ſuis diſpoſitionib{us}:</s>
            <s xml:id="echoid-s1462" xml:space="preserve"> & ſimiliter diuerſantur diſpoſitiones formarum
              <lb/>
            uenientium ſuper ipſas ad uiſum.</s>
            <s xml:id="echoid-s1463" xml:space="preserve"> Et etiam comprehenſio uiſ{us} à re uiſa nõ eſt in omni-
              <lb/>
            b{us} corporib{us}, & in omnib{us} uiſibilib{us}:</s>
            <s xml:id="echoid-s1464" xml:space="preserve"> ſed diuerſatur qualit{as} ſenſ{us} uiſ{us} à reb{us}
              <lb/>
            uiſibilib{us}:</s>
            <s xml:id="echoid-s1465" xml:space="preserve"> & diuerſatur qualit{as} ſenſ{us} uiſ{us} ab una re uiſa ſecundum ſitum unum,
              <lb/>
            & ſecundum eandem dιſtantiam.</s>
            <s xml:id="echoid-s1466" xml:space="preserve"> Et nos diuidem{us} iſtum tractatum in tria capita.</s>
            <s xml:id="echoid-s1467" xml:space="preserve">
              <lb/>
            In primo declarabim{us} diuerſitatem diſpoſitionum linearũ radialium, & diſtingue-
              <lb/>
            m{us} proprietates earum.</s>
            <s xml:id="echoid-s1468" xml:space="preserve"> In ſecundo declarabim{us} omnes intentiones comprehenſas à
              <lb/>
            uiſu, & qualiter comprehendat uiſ{us} quamlibet illarum.</s>
            <s xml:id="echoid-s1469" xml:space="preserve"> In tertio declarabim{us} diuer-
              <lb/>
            ſitatem comprehenſionis uιſ{us} ab eis.</s>
            <s xml:id="echoid-s1470" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div54" type="section" level="0" n="0">
          <head xml:id="echoid-head77" xml:space="preserve">DE DIVERSITATE DISPOSITIONVM LINEARVM
            <lb/>
          radialium, & diſtinctione proprietatum ipſarum.
            <lb/>
          Caput primum.</head>
          <head xml:id="echoid-head78" xml:space="preserve" style="it">1. Recta connectens centra partium uiſ{us}, eſt axis pyramidis opticæ. 18 p 3.</head>
          <p>
            <s xml:id="echoid-s1471" xml:space="preserve">IAm declaratum eſt in primo tractatu [18.</s>
            <s xml:id="echoid-s1472" xml:space="preserve">20 n] quòd lineæ radiales, ex quarum uerticationibus
              <lb/>
            comprehendit uiſus uiſibilia, ſunt lineæ rectæ, quarum extremitates concurrunt apud centrum
              <lb/>
            uiſus.</s>
            <s xml:id="echoid-s1473" xml:space="preserve"> Et iam declaratum eſt in forma uiſus [4 n 1] quòd membrum ſentiẽs, quod eſt membrum
              <lb/>
            glacialis, eſt compoſitum ſuper extremitatem concauitatis nerui, ſuper quem compoſitus eſt ocu-
              <lb/>
            lus totus:</s>
            <s xml:id="echoid-s1474" xml:space="preserve"> & quòd iſte neruus non gyratur niſi à poſteriori centri uiſus, & à poſteriori totius oculi,
              <lb/>
            & apud foramen, quod eſt in concauo oſsis.</s>
            <s xml:id="echoid-s1475" xml:space="preserve"> Et iam declaratum eſt [7.</s>
            <s xml:id="echoid-s1476" xml:space="preserve">9 n 1] quòd linea recta tran-
              <lb/>
            ſiens per omnia centra tunicarum uiſus, extenditur in medio concaui nerui, & tranſit per medium
              <lb/>
            foraminis, quod eſt in anteriori uueæ.</s>
            <s xml:id="echoid-s1477" xml:space="preserve"> Et iam declaratum eſt [5.</s>
            <s xml:id="echoid-s1478" xml:space="preserve">13 n 1] quòd centrũ iſtius lineæ non
              <lb/>
            diuerſatur reſpectu totius uiſus, neq;</s>
            <s xml:id="echoid-s1479" xml:space="preserve"> reſpectu ſuperficierum tunicarum uiſus, neque reſpectu par-
              <lb/>
            tium uiſus.</s>
            <s xml:id="echoid-s1480" xml:space="preserve"> Linea ergo recta tranſiens per omnia centra tunicarum uiſus, ſemper extenditur rectè
              <lb/>
            ad locum gyrationis concaui nerui, ſuper quem componitur oculus, in omnibus diſpoſitionibus,
              <lb/>
            ſiue ſit uiſus in motu, ſiue in quiete.</s>
            <s xml:id="echoid-s1481" xml:space="preserve"> Et quia iſta linea tranſit per centrum uiſus, & per centrum fo-
              <lb/>
            raminis, quod eſt in anteriori uueæ, & per centrũ uueæ extenditur in medio pyramidis, cuius cen-
              <lb/>
            trum eſt uiſus:</s>
            <s xml:id="echoid-s1482" xml:space="preserve"> & continet ipſam circumferentia foraminis, quod eſt in anteriori uueæ:</s>
            <s xml:id="echoid-s1483" xml:space="preserve"> appellemus
              <lb/>
            ergo iſtam lineam axem pyramidis.</s>
            <s xml:id="echoid-s1484" xml:space="preserve"> Et declaratum eſt etiam in ipſo tractatu primo [19 n] quòd py-
              <lb/>
            ramis figurata inter rem uiſam & centrum uiſus, diſtinguit ex ſuperficie glacialis partem continen
              <lb/>
            tem totam formam rei uiſæ, quæ eſt apud baſim illius pyramidis:</s>
            <s xml:id="echoid-s1485" xml:space="preserve"> & erit forma ordinata in iſta parte
              <lb/>
            ſuperficiei glacialis per uerticationem linearum radialium extenſarum inter rem uiſam & uiſum,
              <lb/>
            ſecundum ordinationem partium ſuperficiei rei uiſæ.</s>
            <s xml:id="echoid-s1486" xml:space="preserve"> Cum ergo uiſus comprehenderit aliquã rem
              <lb/>
            uiſam, & peruenerit eius forma in partem ſuperficiei glacialis, quam diſtinguit pyramis prædicta:</s>
            <s xml:id="echoid-s1487" xml:space="preserve">
              <lb/>
            quodlibet punctum formæ prædictæ eſt ſuper lineam radialem extenſam inter illud punctum, &
              <lb/>
            punctum oppoſitum illi in ſuperficie rei uiſæ, ſuper quam uenit forma ad illud punctum in ſuperfi-
              <lb/>
            ciem glacialis rectè.</s>
            <s xml:id="echoid-s1488" xml:space="preserve"> Cum ergo forma rei uiſæ fuerit in medio ſuperficiei glacialis, erit axis prædi-
              <lb/>
            ctus una linearum, ſuper quas ueniunt formæ punctorum, quæ ſunt in ſuperficie rei uiſæ:</s>
            <s xml:id="echoid-s1489" xml:space="preserve"> & erit
              <lb/>
            </s>
          </p>
        </div>
      </text>
    </echo>
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