ateur in Kingston," the latter announced. "I know
them all here. V A X is held by somebody in Port Hope. I listened-in to a
lot of that stuff and called up three amateurs in Port Hope. I learned
that A V L is Alvin Baker who is attending Edwards College."

"Why, he's my cousin!"

This exclamation from Hal created a real sensation in the cabin of the
Catwhisker. Meanwhile Bud had been taking the message down longhand in
order to preserve a record of the investigation, so that Mr. Perry, who
read as the boys wrote, got the progress of events about as rapidly as
did the three youthful experts. It is needless to say that he was as much
astonished as were his boy companions.

But there was no time now for a discussion of family relationship. After
a round of gasps and exclamations, they got down again to the business of
their radio investigation.

That was about the extent of the information that the Kingston amateur
was able to communicate to them, except that he had been an interested
listener-in to much of the code conversations between the would-be
rescuers and the two very strange radio contestants. He, however,
promised to make further inquiries and to call them again if he learned
anything that might be of interest to them.

"Well, dad, it looks as if you were right when you told us how to go
about to solve this mystery," Cub remarked as he dash-and-dotted a "G N"
(good night) to the Kingston amateur.

"You mean problem," reminded Mr. Perry with a smile.

"Well, maybe,--I won't dispute your word since your idea has proved so
brilliant thus far--but I can't see the mathematics yet."

"Nor the geography?"

"Well, yes; it took us from Kingston to Port Hope and from there to
Edwards College," Cub admitted. "I suppose there's a little
geography in that."

"Remember this, that mathematics isn't all figures," said the operator's
father. "Keep that in mind, and maybe it'll be worth something to you
before we're through with this affair."

"How does the discovery of my cousin come in?" Hal inquired. "Is that
geography or mathematics?"

"Do you mean that, Hal?" asked Bud wonderingly. "You don't mean that
fellow is really your cousin?"

"I surely do, if he's Alvin Baker. You know my folks used to live in
Canada. And don't you remember that my cousin Al visited us three years
ago with his father and mother? He wrote to me several times from Edwards
College, but I didn't know he had a wireless set, and I suppose he