"You're right again, dad," said Cub, with a grim grin of subdued wonder and eagerness.

"I shouldn't be a bit surprised to find that the Associated Press has chartered a boat and is following us," declared Mr. Perry.

"Would that be mathematics or geography?" asked Bud.

"It would be imagination," replied Mr. Perry with a keen smile. "But, say, Cub, don't you think you've grabbed off enough glory for yourself? Give your friends a chance to win some honors."

"Right you are, dad," returned the boy at the key, rising and removing the phones from his ears. "Hal, you call half this list and then let Bud call the rest"

It was well for the sake of a distribution of honors that this course was taken, for a thrilling surprise was in store for them in response to the next call.

CHAPTER IX

The Radio Diagram

As good fortune decreed, Hal found Number One in the new list sitting in and listening for anything interesting in the ether. It required only a few short sentences to acquaint this amateur with the object of the Catwhisker's search.

"I can tell you just how to find those fellows," he replied. "I listened-in to the best line of detective work on that subject you ever heard of. Sherlock Holmes isn't in it there."