But no sign of the intruder appeared; the water had closed noiselessly over the now vanished figure.
"What's the matter ?" asked Reade, as he stood looking, then finally flashed his light over to the other side of the wall.
"I saw---" began Hazelton.

Then changed to: "I thought---er---I saw---oh, nonsense! You'll josh the life out of me!" "Not I," Tom affirmed gravely, as a thrill of pity, for what he deemed his friend's unfortunate "nervous condition," shook him.

"Tell me what you saw, Harry." "Why, I thought I saw a big fellow---a black man, too---right behind me, arm upraised, just ready to strike me." "Well, where is he ?" Tom demanded blankly, flashing the light on either side of the narrow wall-top.

"See him anywhere now, chum ?" Harry didn't.

In fact, he hardly more than pretended to look.