think he has dared to make a copy of it?" asked Mr.
Swift.

"I do," answered his son. "That ink spot wasn't there when Abe gave
him the map; was it?"

"No," replied the miner.

"And it couldn't get on in Andy's pocket," went on Tom. "So he must
have had it open near where there was ink."

"His fountain pen might have leaked," suggested Mr. Jackson.

"In that case the ink spot would be on the outside of the map, and
not on the inside," declared Tom, with the instinct of a detective.
"Unless he had the map folded in his pocket with the inside surface
on the outside, the ink couldn't have gotten on. Besides, Andy
always carries his fountain pen in his upper vest pocket, and that
pocket is too small to hold the map. No, I'm almost positive that
Andy or his father have sneakingly made a copy of this map!"

"I'm sorry to have to admit that Mr. Foger is capable of such an
act," spoke Mr. Swift, "but I believe it is true."

"And here is another thing," went on the young inventor, who was now
closely scanning the parchment through a powerful magnifying glass,
"do you see those tiny holes here and there, Mr. Jackson?"

"Yes," answered the engineer.

"Were they there before, Abe?" went on Tom, calling the old miner's
attention to them.

"Nary a one," was the answer. "It looks as if some one had been
sticking pins in th' map."

"Not pins," said Tom, "but the sharp points of a pair of dividers,
or compasses, for measuring distances. Andy, or whoever made a copy
of the map, used the dividers to take off distances with. This
clinches it, in my mind."

"But what can you do?" asked Tom's father.

"I don't know," answered the young inventor. "It would be of little
use to go to Andy. Naturally he would deny having made a copy of the
map, and his father would, also. Even though I am sure they have a
copy, I don't see how I am going to make them give it up. It's a
hard case. There's only one thing I see to do."

"What's that?" asked Abe.

"Start for Alaska as soon as possible, and be first on hand at the
valley of gold."

"Good!" cried the miner. "That's the way to talk! We'll start off at
once. I know my way around that country pretty well, an' even though
winter is coming on, I think we can travel in th' airship. That's
one reason why I wanted t' go in one of these flyin' machines.
Winter is no time to be in Alaska, but if we have an airship we
won't mind it, an' it's the best time t' keep other people away, for
th