“But don’t you conclude⁠—?”

“Just what you conclude yourself. Yes; I do, perfectly. We have left the granite and the lava. It is possible that I may be mistaken. But I cannot be sure of that until I have reached the very end of this gallery.”

“You are right in doing this, my uncle, and I should quite approve of your determination, if there were not a danger threatening us nearer and nearer.”

“What danger?”

“The want of water.”

“Well, Axel, we will put ourselves upon rations.”