Cardano, Girolamo, De subtilitate, 1663

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              <s id="s.005665">
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              diſſoluuntur. </s>
              <s id="s.005666">Silex autem non pellucet, quia
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              terreus eſt: diſſoluitur tamen, quia frigore
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              concreuit. </s>
              <s id="s.005667">At lapides opaci, quales plerique
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              ſunt, & qui in calcem vertuntur, nec frigo­
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              re omninò concrenerunt, nec aquea ſunt
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              ſubſtantia: aut ſi modò frigore concreue­
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              runt, quoniam frigidi eſſe videntur, terræ
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              multum, aquæ autem parum continent. </s>
              <s id="s.005668">Ma­
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              nifeſtum eſt igitur cryſtallum, quòd ſit per­
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              ſpicuus hic lapis, & facilè liqueſcat, aquea
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              ſubſtantia pura ac frigore concreta con­
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              ſiſtere.
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              </s>
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              <s id="s.005669">
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              Lapis qui
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              percuſſus la­
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              pillo imagi­
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              nem ſonæ ci­
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              tharæ refert.</s>
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            <p type="main">
              <s id="s.005670">Atque hæc clara quidem ratione con­
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              ſtant. </s>
              <s id="s.005671">Cæterùm aliqua ſunt ſubtilioris ac
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              obſcurioris contemplationis, vt propè ad
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              miraculum accedere videantur. </s>
              <s id="s.005672">Quale illud
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              eſt, quod Pauſanias refert, fuiſſe in arce Me­
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              garæ iuxta focum lapidem, qui percuſſus
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              lapillo cithatæ plectro pulſatæ ſonum re­
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              ferret. </s>
              <s id="s.005673">Id ſcio, quàm multi ridebunt me nu­
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              gas, & etiam antiquas nugas, Plinij more
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              referentem: ſed nos quòd hoc contigerit,
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              quamuis locuplete teſte, non contendimus:
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              quòd verò contigiſſe potuerit, quódque in
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              poſterum contingere poſſit, non dubitamus.
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              </s>
              <s id="s.005674">Illud potiùs diligenter perquirendum, quo­
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              modo hoc fieri poſſit. </s>
              <s id="s.005675">Quòd verò natura, aut
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              arte, nullum eſt diſcrimen. </s>
              <s id="s.005676">Ab arte igitur,
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              tanquam nobis notiore ac faciliore, ſuma­
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              mus exemplum. </s>
              <s id="s.005677">Cùm enim citharæ reſo­
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              nent, ob id quòd lignum cauum eſt, & ca­
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              uernis plenum, ac ſpongioſum, atque multi­
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              pliciter per anfractus diuiſum, illud idem in
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              lapide oportet excogitare. </s>
              <s id="s.005678">Vt verò tale eſſet,
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              præter cauernas & cauitatem, metallicam
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              materiam ſono aptam immiſtam fuiſſe, ne­
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              ceſſe fuit. </s>
              <s id="s.005679">Inter autem metalla ſolùm & ma­
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              ximè æs reſonat: nam cuprum diximus eſſe
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              æs Cyprium. </s>
              <s id="s.005680">Fabulabatur igitur antiquitas
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              illic Apollinem citharam repoſuiſſe. </s>
              <s id="s.005681">Sed eſt
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              aliud oſtenti genus, quod non parum admi­
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              rabatur antiquitas. </s>
              <s id="s.005682">Lapis erat in Olympia,
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              qui adeò perterrebat equos, vt currus fran­
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              gerent, & ſeſſores excuterent, aurigarum lo­
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              cis ac minis contemptis: vnde lapidi nomen
                <arrow.to.target n="marg819"/>
                <lb/>
              inditum Taraxippus, quaſi equorum con­
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              turbator, & formido. </s>
              <s id="s.005683">Nec in eo veneficium,
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              ſiquidem ars nulla: ſed talis ſpontè lapis, vt
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              qui ruberet ac ſplenderet flammæ in modum
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              ingens, ex quo imago relucebat equorum:
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              vnde illi vel ignem imaginati, vel propria
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              ſpecie decepti, vertebantur in fugam. </s>
              <s id="s.005684">Ignem
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              enim maximè equi formidant. </s>
              <s id="s.005685">Succurrit me­
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              moriæ, quod mihi contigerit propè iam
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              triennio exacto. </s>
              <s id="s.005686">Eram Genuæ, cœnaueram
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              apud illuſtrem virum Franciſcum Duardum
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              Cæſareum quæſtorem, à cœna pluit imbres
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              maximos: pileo, ocreis, gabanio, cùm mihi
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              eſſem oneroſus. </s>
              <s id="s.005687">Dat ille, vt eſt merè huma­
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              nus, equos generoſos, conſcendimus: aderat
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              autem mecum Ludouicus Ferrarius. </s>
              <s id="s.005688">Dum
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              viam quandam tranſimus, ſuccedunt nobis
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              viri, faces ferentes: flabat ventus ab ea parte,
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              & ſcintillas ferebat ante nos, quamuis pro­
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              cul: ob id exterritis equis tamen magno
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              fuimus in periculo, vt iam vix contineri
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              poſſent ab his, qui nobiſcum erant ſeruis,
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              etiam arreptis frænis ne erigerentur. </s>
              <s id="s.005689">Et erat
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              callis anguſtus laterum ſtructura quaſi in
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              fornicem procliuum, vt ſi erecti fuiſſent,
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              actum de nobis eſſet, præcipuè quòd ob plu­
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              uias neque pediſſe qui, nec equi ſtare po­
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              tuiſſent, quin laberentur. </s>
              <s id="s.005690">Et cum de his aliàs
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              dixerimus, nunc ſatis fuerit monuiſſe, equos
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              ignibus maximè terreri, atque ob id Tara­
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              xippum non miraculo aliquo, ſed certa ra­
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              tione illos in fugam compuliſſe. </s>
            </p>
            <p type="margin">
              <s id="s.005691">
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              Taraxippus
                <lb/>
              lapis.</s>
            </p>
            <p type="main">
              <s id="s.005692">Sed vt tandem metallicorum omnium
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              narrationi finem imponam, docere operæ
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              pretium eſt, quomodo veræ gemmæ à falſis
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                <arrow.to.target n="marg820"/>
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              dum in annulis latent dignoſcantur. </s>
              <s id="s.005693">Docuit
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              autem nos primo hoc Hieronymus Gueri­
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              nus ab oculis gemmarius, de quo ſuperius
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              mentionem fecimus, demonſtrationem au­
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              tem nos addidimus. </s>
              <s id="s.005694">Annulo conuerſo angu­
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              li, & latera inſpiciantur, & videbuntur di­
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              lutioris coloris: nam ſit co­
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              lor C, oculus D, anguli A
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              & B, manifeſtum eſt, quòd
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              D non videbit A colore
                <lb/>
              C, quia linea DC cadit in­
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              fra punctum A. </s>
              <s id="s.005695">Et rurſus ſi
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              conuertatur annulus, idem
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              continget. </s>
              <s id="s.005696">Quòd ſi AB ſu­
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                <figure id="id.016.01.128.1.jpg" xlink:href="016/01/128/1.jpg" number="67"/>
                <lb/>
              perficies vngui ſupponatur, non videbitur
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              color in angulis, ſed erit dilutior: refran­
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              guntur enim radij potentes in vera gemma
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              ex vnguis plano. </s>
            </p>
            <p type="margin">
              <s id="s.005697">
                <margin.target id="marg820"/>
              Quomodo
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              falſæ gemmæ
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              dignoſci fa­
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              cilè poſſint.</s>
            </p>
            <p type="main">
              <s id="s.005698">Eſt & alia non leuis lucri ſeplaſia, cùm
                <lb/>
                <arrow.to.target n="marg821"/>
                <lb/>
              ex concha margaritarum pulcherrimi fin­
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              guntur vniones. </s>
              <s id="s.005699">Adeò autem rectè fraus
                <lb/>
              hæc ſuccedit, quòd nec à gemmariis dignoſ­
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              cuntur: color, ſplendor, ſubſtantia, pon­
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              dus reſpondent. </s>
              <s id="s.005700">Sunt qui etiam ex duobus
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              fruſtis ob conchæ tenuitatem vniones con­
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              ficiunt. </s>
            </p>
            <p type="margin">
              <s id="s.005701">
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              Margarita­
                <lb/>
              rum adulte­
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              ratio.</s>
            </p>
            <p type="main">
              <s id="s.005702">Dum hæc ſcriberem, lis agebatur de mar­
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              garita 68. aureis empta à gemmario, quæ ex
                <lb/>
              concha facta erat: pretium æſtimationis au­
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              rei ducenti. </s>
              <s id="s.005703">Sperabant imponere Germanis
                <lb/>
              aut Gallis, quòd ingenio, & arte minùs va­
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              lere eos exiſtimant: hos enim barbaros pu­
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              tant: cùm nos veriùs ſimus barbari: ſiquidem
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              magis barbarum eſt decipere, quàm decipi.
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              </s>
              <s id="s.005704">Sed ſatis de metallicis actum eſt: nunc au­
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              tem ad plantas tranſeamus. </s>
            </p>
          </chap>
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    </archimedes>
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