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THE CENTRAL HEAT
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is incandescent, or whether there are only small seas of liquid fire scattered around within thirty miles of the surface. In either case you must count on having to battle with the internal heat of the earth."
"Oh, certainly," said Dr. Giles; "I have arranged to do so."
"What!" exclaimed Mr. Curtis, astonished, "you mean to say that you could dig your tunnel through these seething lakes of fire?"
"That is precisely what I do mean," returned Dr. Giles, "and it will not seem so strange to you when I explain the precautions I intend to take against the internal heat."
