At length Diogenes turned to the right, and Torquatus looked around him anxiously.

“I wonder,” he said, “how many turns we have passed by, before leaving this main gallery?”

“A great many,” answered Severus, drily.

“How many do you think, ten or twenty?”

“Full that, I fancy; for I never have counted them.”

Torquatus had, however; but wished to make sure. He continued, still pausing:

“How do you distinguish the right turn, then? Oh, what is this?” and he pretended to examine a small niche in the corner. But Severus kept too sharp a look-out, and saw that he was making a mark in the sand.

“Come, come along,” he said, “or we shall lose sight of the rest, and not see which way they turn. That little niche is to hold a lamp; you will find one at each angle. As to ourselves, we know every alley and turn here below, as you do those of the city above.”