"A cryptogram!" exclaimed Bob.
"I wonder who left it?" added Dick.
"And what it means?" said Randall.
"Perhaps, if we work it out, it may tell us where to find our mysterious visitor," went on Bob Somers. "These things are getting more and more interesting."
"That was my idea!" exclaimed Nat Wingate.
"Maybe it's just a bit of foolishness," put in Tom.
"No, I think it has a meaning. This figure at the bottom may be one of our huts."
"And those funny-looking spots above?"
"They look like trees to me; eh, Chubby?"
The poet laureate lazily inclined his head.