You've got an eight by ten, and mine is less than a four by five,"
answered Billy. "The figures are naturally four times as large. By
Jinks! you have a handsome picture, Jack."

"Yes, but tell me what you see on one that you don't see on the other.
You should see it on both, of course, but it stands out stronger in the
enlargement, as it naturally would."

Percival looked at the larger picture and said:

"Hello! there is a man looking out from among the rocks on the ledge.
Did you know he was there, Billy?"

"No, I did not. He must have kept pretty still, for that was a long time
exposure. He is not as strong as the objects around him, however. How is
that, Jack? H'm! I know. He came in after I had started to take the
scene."

"That's it, and he kept still because he wanted to hear what you boys
were talking about, and did not wish to be discovered himself. Do you
see him on the smaller print, Billy?"

"Yes, now, but I did not at first. Golly! but you have eyes, Jack! You
saw this on the plate?"

"Yes, and that is why I wished to get the enlargement. Do you recognize
the man, boys?"

"I never saw him," said Percival, "but if that is not the man with the
white mustache and the black eyebrows I am very much mistaken. My! but
how he glares!"

"It is the man with the white mustache," said Jack. "I have reason to
recognize him. That is the bank robber. He is glaring, as you say, Dick.
There was something on his mind. What do you suppose it was?"

"I am sure I don't know. Do you suppose he was afraid we might find his
hiding place. By Jove! we found the burglars' tools, Jack, and now you
have found the burglar himself on Billy's plate."

"Yes, and you said there would not be anything on it," laughed the
good-natured fellow.

"Why, no, Billy, I did not altogether say----"

"No, you didn't say it, but you intimated it just the same. Well, my
pinhole camera has turned out all right, hasn't it?"

"Yes, and I must say that I am surprised."

"The rock fell down shortly after we had gone inside the cave, Billy?"
asked Jack.

"Yes. None of us had any suspicion that such a thing would happen, and
we were very anxious about you. I don't see now why it should have
happened. We have not had any rains to loosen things."

"I will tell you how it happened," said Jack earnestly. "Your man here,
with his fierce eyes, like those of a hunted wild beast, was plotting
our death when he shoved down that boulder, for it was he