"By Jove! I forgot this;" and Compton produced a fragment of cloth.
"I took that from a post in the pool."
"A bit of rag," said the Hunter.
"Yes; but a bit torn out of my sleeve yesterday over there in the defile."
Venning snatched at it. "I have it," he shouted.
"I see you have; but you need not yell."
"The blind river! It comes out under the pool!"
Compton stared.
"What do you mean?" asked Mr. Hume.
"Why, sir, we dropped a tree stump into the opening which swallows the river over there. As it slipped from our hands, it caught Dick's sleeve, tearing out the bit of cloth, and nearly taking him down too."
"Well, what then?"