Cardano, Girolamo, De subtilitate, 1663

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              <s id="s.002418">
                <pb pagenum="409" xlink:href="016/01/058.jpg"/>
              etiam frequens ob exhalationem ſequere­
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              tur: aqua verò adhuc longè eſſet feruidior,
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              aliquandoque viſa foret, erumperetque per
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              interualla his in locis, cum tamen nunquam
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              viſa ſit. </s>
              <s id="s.002419">Indicio eſt flammam ſub terra non
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              poſſe eſſe perpetuam, quòd vbi erumpit,
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              nunquam niſi per interualla id contigit.
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                <arrow.to.target n="marg268"/>
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              Contingit autem, vt obſeruatum eſt, hoc
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              ob ventos. </s>
              <s id="s.002420">Nam quum venti ſæuiunt iux­
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              ta loca, è quibus flamma erumpere ſolet,
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              tunc poſtridie, aut perendie, expectanda
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              eſt. </s>
              <s id="s.002421">Hoc autem fit calore intimo, velut in
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              calce ab externo frigore intus coacto, in­
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              de accenſo ſulphure bitumineve, velut à
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              follibus flamma augetur. </s>
              <s id="s.002422">Hoc autem eſt
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              quòd ſuprà demonſtrare polliciti ſumus,
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              dum de Ætnæ crateribus ſermonem habe­
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              remus. </s>
              <s id="s.002423">Auctus igitur erumpit ea ratione,
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              quæ de cuniculis demonſtrata eſt. </s>
              <s id="s.002424">Hæc
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              omnia ergo ſi conferantur inuicem, prunam
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              ſubeſſe certò concludemus. </s>
              <s id="s.002425">Sed vnde alitur,
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              vnde motus, vnde reſpiratio? </s>
              <s id="s.002426">his enim tri­
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              bus ignem indigere ſuperiùs eſt demonſtra­
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              tum. </s>
              <s id="s.002427">Reſpirationem probet lapis aridus, ac
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              fungoſus, ignem fouens non aliter ad vn­
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              guem quam calidus cinis. </s>
              <s id="s.002428">Motum exhibet
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              materia noua quæ perpetuo accenditur,
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              atque ita ignis ſedem mutans mouetur. </s>
              <s id="s.002429">Sic
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              enim in fuligine apud nos, quamdiu ſupereſt
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              ignis ſerpens, ſeruatur. </s>
              <s id="s.002430">Nec idcircò conci­
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              pit flammam, quòd bitumen illud impu­
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              rum eſt, atque terræ miſtum. </s>
              <s id="s.002431">In omnibus
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              igitur fuligini perſimilis eſt materia il­
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              la quæ ſub terra ardet, vnde fuliginem
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              bituminis ſpeciem eſſe haud dubium
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              eſt. </s>
              <s id="s.002432">Cur igitur in flammam non erum­
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              pat, cauſæ due ſunt: altera, quòd bitu­
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              men impurum ſit: reliqua, quòd non reſ­
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              pirat. </s>
              <s id="s.002433">Itaque fit vt tenuior quandoque pars
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              illius aſcendatur, flammamque emittat,
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              tuncque terræ motus & ſonitus exauditur.
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              </s>
              <s id="s.002434">Sed materia non ſuppetente, quòd ſaxo
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              miſta ſit, nec benè reſpiret, non erumpit,
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              ſed ſpontè mouetur. </s>
              <s id="s.002435">Sed quonam pacto
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              ignis concluſus non extinguitur, aut ſaltem
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              dum materiam depaſcitur, ſedem non mu­
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              tat? </s>
              <s id="s.002436">Cur non extinguatur cauſæ duæ ſunt,
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              bitumen & frigus aquæ, à quo cogitur calor
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              intus, nec ſecus quam in calce ignem accen­
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              dit. </s>
              <s id="s.002437">Illud idem frigus ignem in loco eodem
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              retinet, qua ſemper ſub aqua. </s>
              <s id="s.002438">Sed longo
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              ſpatio aqua feruet, anguſto erumpit. </s>
              <s id="s.002439">Verum
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              quòd paruus ignis tanto feruori ſufficiat,
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              quatuor ſunt cauſæ. </s>
              <s id="s.002440">Prima, quæ non reſpi­
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              rat, vt in æſtuariis. </s>
              <s id="s.002441">Secunda lapidis natura
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              quæ tophus eſt per ſe calidus, multum con­
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              cipiens caloris, ac ſtabilem reddenſque af­
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              fatim. </s>
              <s id="s.002442">Tertia cinis, quæ relictus eſt calidus,
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              ac plurimus & ſuapte natura ſiccior: vnde
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              etiam infuſa aqua hic noſter quæ longè
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              imbecillior eſt, illam excalefacit. </s>
              <s id="s.002443">Accedit
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              vltimò quòd aqua illa diuiſa eſt per riuu­
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              los, facileque ob id calorem concipiens ac
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              retinens, quæ ſi in vnum coacta eſſet, vix
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              totius montis incendio incaleſceret, & ca­
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              lefacta celerrimè etiam rediret ad propriam
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              naturam: ob id nullum mare, nullus la­
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              cus, nullum flumen feruere poteſt ob aqua­
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              rum abundantiam. </s>
              <s id="s.002444">Fontes, atque vt eò
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              minores, ſic acrius ſole ebulliunt. </s>
              <s id="s.002445">Sed cur
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              non maior pars accenditur bituminis? </s>
              <s id="s.002446">quo­
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              niam ſolum id accendi poteſt, quod ab
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              aqueo humido ſpoliatur. </s>
              <s id="s.002447">Cùm verò totum
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              ſcateat hoc humido bitumen, atque hoc ip­
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              ſo à ſulphure differat, priuſque accendatur,
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              ſiccari neceſſe eſt, diuque ob id proximo
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              igni etiam reluctari: ita fit vt valde ſen­
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              ſim ignis adiunctam ſibi materiam depaſca­
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              tur. </s>
              <s id="s.002448">Cum igitur nec creſcere multum, nec
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              penitus extingui ignis ob dictas cauſas
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              queat, multa verò ſit materia illi parata,
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              paucuſque ad feruorem ſeruandum calor ſuſ­
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              ficiat, neceſſe eſt ipſum feruorem multis
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              ſeculis manere. </s>
              <s id="s.002449">Manifeſtum eſt igitur,
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              quod omnes aqua, quæ feruent, natura le­
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              ues ſunt, & medica præditæ facultate. </s>
              <s id="s.002450">Sed
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              non talis eſt, quæ vſui apta eſt ad ſeruan­
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              dam valetudinem. </s>
              <s id="s.002451">Optima enim aqua co­
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              lore, odore, ſaporeque caret, pellucidaque
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              exiſtit, atque epota non moratur in ventre:
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              talis Eulæi fluminis qui per Suſianam è
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              Zagro monte profluit, nam eam Perſarum
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              Reges ſecum in expeditionibus deferebant:
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              tantum fuit illis diligentiæ ad vitam tuen­
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              dam. </s>
              <s id="s.002452">Nam in eius conſeruatione proxima
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              eſt aëri aqua, vt in Commentariis ſuper
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              tractatu de Temperamentis Auicennæ de­
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              monſtrauimus. </s>
              <s id="s.002453">Neque mirum videri debet
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              quòd Artaxerxes Longimanus tamdiu vi­
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              xerit, cum Perſarum reges tantam curam in
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              aëre & aqua deligendis impenderent. </s>
              <s id="s.002454">Sed lo­
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              co Eulæi apud Ælianum Choaſpem inue­
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              nio. </s>
              <s id="s.002455">Inueni & flumen eſſe iucundiſſimi ſa­
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              poris inter Gangem & Indum, ex quo quæ
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              non poſſunt regionis accolæ bibere, percur­
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              ſores tranſlatis aquis bibunt. </s>
              <s id="s.002456">Sed Coaſpes
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              in Mediæ regione eſſe creditur, Stabone ta­
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              men aliter ſentiente: ſed ſi in India eſſet,
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              Perſepolim vix transferri potuit. </s>
              <s id="s.002457">Coaſpis
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              igitur aqua optima ſit: Eulæi verò iucunda,
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              & ipſa, atque in vſu Perſarum regibus In­
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              diam optimas & iucundiſſimas aquas habe­
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              re certum eſt. </s>
              <s id="s.002458">His proxima bonitate Niloti­
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              ca, reliquorum maiorum fluminum vix vlla
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              probatur. </s>
              <s id="s.002459">Sed de his ſpecialiter alibi tracta­
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              uimus. </s>
              <s id="s.002460">Sunt aliæ frigiditate celebres, olim ex
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              Corinthio agro è montis vertice fluens, ni­
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              ue frigidior. </s>
              <s id="s.002461">Refert Georg. </s>
              <s id="s.002462">Agricola intra
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              primum à Culma lapidem, Inſanam, voca­
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              tam, quæ cum feruere videatur, eſſe frigi­
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                <arrow.to.target n="marg271"/>
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              diſſimam. </s>
              <s id="s.002463">In Bohemia rurſus iuxta flumen
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                <expan abbr="Egrã">Egram</expan>
              , Furioſa, appellata, quæ & ipſa ampul­
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              lis feruens non frigore, ſed tonitru potiùs
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              edito inſignis: ſic auribus cadendo obſtrepit.
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              </s>
              <s id="s.002464">Simili modo poſtquam Conſtantienſem la­
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              cum iuxta Scaphuſiam exiuit è rupib. </s>
              <s id="s.002465">Rhe­
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              nus adeò altis præcipitatur, vt procul multis
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              paſſuum millibus audiatur, propè verò to­
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              nitrui ſimilis fragor videatur. </s>
              <s id="s.002466">Nam ſtrepi­
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              tus aquarum cauſa eſt caſus ab alto, aut exi­
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              tus cum impetu ex anguſtis locis: ſicut frigo­
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              ris niues, marmora, metalla, cœlum rigens,
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              motuſque rapidus, tum caſus ab alto, & quod
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              maximum eſt, permiſtio halinitri: nam hoc
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              inferius demonſtrabitur. </s>
              <s id="s.002467">Sed frigiditas hæc
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              in quibuſdam fontibus perpetua non eſt: ve­
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              lut in Hiſpaniæ agro quodam oppidi Peſ­
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              queræ de Duero, iuxta magnum flumen Du­
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              rium, à Fortunatis diſtat 11. partibus, ab æ­
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              quinoctij circulo 42. fons qui ab initio veris </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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