IMPARA L'INGLESE CON
BABYLON!
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About eight o'clock in the evening, my uncle gave the signal for halting. Hans seated himself on the ground. The lamps were hung to fissures in the lava rock. We were now in a large cavern where air was not wanting. On the contrary, it abounded. What could be the cause of this--to what atmospheric agitation could be ascribed this draught? But this was a question which I did not care to discuss just then. Fatigue and hunger made me incapable of reasoning. An unceasing march of seven hours had not been kept up without great exhaustion. I was really and truly worn out; and delighted enough I was to hear the word Halt.
Hans laid out some provisions on a lump of lava, and we each supped with keen relish. One thing, however, caused us great uneasiness--our water reserve was already half exhausted. My uncle had full confidence in finding subterranean resources, but hitherto we had completely failed in so doing. I could not help calling my uncle's attention to the circumstance.
"And you are surprised at this total absence of springs?" he said.
"Doubtless--I am very uneasy on the point. We have certainly not enough water to last us five days."
"Be quite easy on that matter," continued my uncle. "I answer for it we shall find plenty of water--in fact, far more than we shall want."
"But when?"
"When we once get through this crust of lava. How can you expect springs to force their way through these solid stone walls?"
"But what is there to prove that this concrete mass of lava does not extend to the centre of the earth? I don't think we have as yet done much in a vertical way."
"What puts that into your head, my boy?" asked my uncle mildly.
"Well, it appears to me that if we had descended very far below the level of the sea--we should find it rather hotter than we have."
"According to your system," said my uncle; "but what does the thermometer say?"
"Scarcely fifteen degrees by Reaumur, which is only an increase of nine since our departure."
"Well, and what conclusion does that bring you to?" inquired the Professor.
"The deduction I draw from this is very simple. According to the most exact observations, the augmentation of the temperature of the interior of the earth is one degree for every hundred feet. But certain local causes may considerably modify this figure. Thus at Yakoust in Siberia, it has been remarked that the heat increases a degree every thirty-six feet. The difference evidently depends on the conductibility of certain rocks. In the neighborhood of an extinct volcano, it has been remarked that the elevation of temperature was only one degree in every five-and-twenty feet. Let us, then, go upon this calculation--which is the most favorable--and calculate."
"Calculate away, my boy."
"Nothing easier," said I, pulling out my notebook and pencil. "Nine times one hundred and twenty-five feet make a depth of eleven hundred and twenty-five feet.
