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Mundus Subterraneus

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,<br />

i<br />

id<br />

Secl.l.<br />

Caufalinearum<br />

in<br />

kpidibus<br />

elucefcentiim.<br />

arte<br />

lineati lapides<br />

eonficUntnr.<br />

24 M U N D I S U B<br />

nafcuntur , de quibus pluribusalibi. Qua- Exper.<br />

hoc loco caufam tantum innuiffe fuifi-<br />

.<br />

riofusexungueleonemcoUigat, hxcexin-j<br />

numeris pauca hic addenda cenfuimus.<br />

Quaerituritaque, quomodo Natura tantam<br />

re<br />

ciat.<br />

linearum •vartetatem proclucat ? Dico itaque,<br />

caufam effe.fuhjlantiam terrenam ; ex qua lapis<br />

excrevit ; qu£B primo quidem argilla<br />

moUis , deinde ohJiccitatem intervenientem<br />

varias rima^ egit ;<br />

quemadmodum ufu venit<br />

in lutulentis lacunis pkiviis prxcedentibus<br />

polygonas nafci voluit<br />

',<br />

quae calore Solis paulatim exficcats in<br />

,<br />

innUmerasomnis generisrimas finduntur; quamvis non ignorem ,<br />

ita quoque in hifce lapidibus , antequam<br />

fpiritu lapidifico indurarentur , accidifi"e<br />

cenfemus; quas rimas deinde gypfeus vapor,<br />

quolocusnaturaliterabundat, ingresfuscondenfatufqueineam<br />

veritatis avido fatisfiat.<br />

linearum in cos-<br />

ruleo candicantium varietatem ,<br />

quam o-<br />

ftendimus ,<br />

juxta rimarum duftus abiit , cujus<br />

rei veritatem fequens experientia me<br />

docuit.<br />

EXPERIMENTUM.<br />

A Ccipe argillce mollts placentam ,<br />

quam<br />

^^fupracraticulam fubtilibus filis ferreis differre :<br />

inftrudam tripodeque fuffultam fuperimpone:<br />

infraquamcarbones pofiti, flatim<br />

mafl"am difiToluto humido , calore in multiplices<br />

rimas agent. Hoc peradlo , cerujjam<br />

crucibulo impofitam forti igne exagita, &<br />

videbis, ceruflam in vaporem exaltatam rimafque<br />

tes adhuc fortius uniat ,<br />

argillaces placentcB penetrantem<br />

ibidem hasrere ,<br />

jam ab ambiente frigore<br />

nonnihilcondenfatam ;<br />

quoperadlo , depofita<br />

argilla pro rimarum aftarum duftibus<br />

innumeras lineas candidas demonftrabit : negotiumtamenita<br />

dextre peragendum efl,<br />

utcraticulanonimmediate fupra crucibuium<br />

majoriautminori ,<br />

,fed nonnihil altius conflituatur, ne<br />

vapornimiumattenuatusintra rimas evanefcat,<br />

fedadprimum frigoris contacflum<br />

condenfetur. Siverominio rem tentaveris,<br />

fivelinearum varietatem non eodem modo<br />

produci , fed hujufmodi maculas linearumque<br />

dullus , ut plurimum ex tingentihus variorum<br />

D e Polygonarum gemmarum geneji.<br />

'NJ' Otatur haec mirabilis lapidum afTeclio<br />

-^^ potififimum in gemmis tranjlucentihus,<br />

quas quidem omnes Natura aut rotundas aut<br />

quo fine, quantumingenii<br />

mei debilitas permittet , exponam :<br />

nil adeo Phyficorum<br />

ingenia hucufque vexafTe ,<br />

quam hanc<br />

prodigiofam angulofa Joholis progeniem<br />

.<br />

Varii varia adducunt,fednihilquo ingenio<br />

Nos quid longa experientia<br />

circa hujufmodi obfervavimus,<br />

adducemus.<br />

Ex fupradiftis conflat, orjftnes diaphanas<br />

gemmas, unam eandemque

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