"and I thought I put it in my desk. I didn't, by any possible chance give it to you; did I, Ned?"
"Me? No, I haven't seen it."
"That's funny," went on Tom. "I'll look once more. Maybe it got under some papers."
They heard him rummaging again in his desk.
"Bless my bank-book!" cried Mr. Damon. "I hope nothing has happened to that map. We can't find the valley of gold without it."
Tom came back again.
"I can't find it," he said, hopelessly.
Then ensued a frantic search. Every possible place in the airship was looked into, but the precious map did not turn up.
"Perhaps the Fogers took it," suggested Mr. Parker, who had helped in the hunt, in a dreamy sort of fashion.
"That's not possible," said Tom. "They haven't been near enough to us since I saw the map last. No, the last time I had it was just before the hail storm, and, in the excitement of repairing the ship. I have mislaid it."
"Maybe it's back there in the big cave," suggested Ned.
"It's possible," admitted the young inventor. "Pshaw! It's very careless of me!"
"If you think it's in the cave, we'd better go back there and have a hunt for it," suggested
