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. The thing
that had been so real a moment before was now utterly invisible. Hazelton
began to share his chum's suspicion as to the utter breakdown of his nerves
and powers of vision.

"It was nothing, of course," said Harry, shamefacedly, but Tom vigorously
took the other side of the question.

"See here, Harry, it must have been something," insisted Reade. "You're
not dreaming, and you're not crazy. It would take either one of those
conditions to make you see something that didn't really exist. No mere
nervous tremor is going to make you see something as tall as a man,
standing right over you, when no such thing exists."

"Well, then, where is the fellow?" Harry Hazelton demanded, helplessly, as