Then, silently and with great caution, Dummy led on along a wild chasm of the same nature as others they had passed, and formed, evidently during some convulsion, the encrinite marble of which the walls were composed matching exactly, and merely requiring lateral pressure and the trickling of lime-charged water to become solid once again.

About three hundred yards beyond the last sentinel the trio paused, and stood listening and gazing as far as they could across a rock chamber whose sides glittered with double prismatic crystals.

But there was the water gurgling at the bottom of the deep crack along which they passed—nothing more; and they returned toward the pool, Sir Edward giving the men a word or two of caution, and then passing on to the others who were whispering to each other as they ate their food.

It was too good an example not to be followed, and soon after, quite refreshed, Sir Edward gave the order for a fresh start, the way being doubly interesting now that it was all fresh ground to the guides. In addition, it became more difficult, for the formation began now to change, and instead of being a succession of narrow crack-like passages—in almost every variety of inclination between the horizontal and perpendicular, and rock grotto-like chambers of varying extent—the road began to fork and break up into vast halls, from which more than once they could hardly find an exit.

But Dummy was invaluable, and there was a kind of triumph in his face when he pointed out how easy it was to go on if you listened for the trickling of the stream below.

At last, after passing through a long succession of scenes that were as wondrous as strange, Sir Edward called upon the boy to stop, and upon Dummy coming back to his side, lantern in hand, “Do you think you can find your way back?” he asked.

“Yes, with my eyes shut,” said the boy, smiling.

His tones chased away his master’s feeling of uneasiness, and he went on:

“That’s a good boy; but what about your notion of this place leading into the cavern where those ruffians are? We must be far past Ergles, even if we are in the right direction.”

“No,” said Dummy confidently, as his father, who now came up, lantern in hand, looked doubtful too.