another. As they moved forward they listened intently for some further sound from Merrick, but none came.
"Hullo, what's this?" cried Dick, presently, and moved to one side, close to a pool of dark and treacherous-looking water. "A man's hat!"
He picked it up and turned it over. On the inside were the initials, S. A. M.
"It must be Merrick's," he went on. "Can he have gone down here?"
The others came at his call and all looked at the hat, which had been lying in the mud at the side of the pool. Then a match was struck, and all gazed around and into the pool while this faint illumination lasted. No other trace of the missing man was to be seen.
"Merrick, where are you?" called out Dick. "If you need help, say so, and we'll try to get you out."
"Do you think he'd answer that call?" asked Fred.
"I think he'd rather go to prison than die in this swamp," was the reply.
The students and Mr. Laning moved cautiously around the edge of the swamp for half an hour and then returned to the roadway. To mark the spot where the hat had been found Dick hung the head covering on a tree limb.
"We can come back in the daylight and make
