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Underground Rivers - University of New Mexico

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Chapter 9 -- Thermodynamic Engines<br />

gush out all together with great violence to the same quantity with the Bulk <strong>of</strong> that part <strong>of</strong> the<br />

Mountain which is settled into the Subterraneous Lakes, which is the cause o/this Prodigious<br />

over flowing.<br />

A dye study described in Chapter 46 would later show the Garonne's subterranean reach<br />

involves no such hydrophylacium, but Chapter 46 wouldn't have been available at the time.<br />

For centuries to follow, Kircherian drawings -- the<br />

cavernous hydrophylacia being a trademark --<br />

have proven to be almost impossible to suppress.<br />

We cite, for illustration, "Popular Geology, a<br />

Complete Summary <strong>of</strong> the Science, with Many<br />

Illustrations," engraved by John Emslie, published<br />

in Reynolds' Twelve Geological Diagrams (1860),<br />

a portfolio <strong>of</strong> plates to be passed around a lecture<br />

hall or posted for edification.<br />

The enlargements <strong>of</strong> the lower left and right<br />

figures bear the hydrophylacia stamp <strong>of</strong> our<br />

irrepressible Jesuit.<br />

Section <strong>of</strong> an Intermittent Spring<br />

The rain by percolating the rock fills the<br />

cavity A until it reaches the top <strong>of</strong> the bend B,<br />

the spring will then flow until the water is<br />

exhausted, the same phenomena being<br />

again repeated.<br />

Section <strong>of</strong> a Geyser<br />

DRAFT 1122//66//22001122<br />

The water percolating the rock fills the<br />

cavity A and becoming greatly heated by<br />

volcanic action, steam is formed, which by<br />

its elastic force drives the water up the<br />

channel B whence it issues as a fountain.<br />

Uppddaatteess aatt hhttttpp::////www. .uunnm. .eedduu//~rrhheeggggeenn//UnnddeerrggrroouunnddRi ivveerrss. .hhttml l<br />

83

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