are patroling the
regular channels of navigation."

"All that may be true, sir," said Jack, "but these submarines are slippery
customers, as I have reason to know. It would be well to take even further
precautions."

"And what would you suggest?" asked Secretary Daniels.

"Why, sir," said Jack, "I'd suggest cancelling sailing orders of all
transports temporarily, at least until such time as I felt sure they could
go in safety. Then I'd flash a warning broadcast to all vessels within
reach of the wireless to be on the lookout for enemy submarines. I'd rush
every available submarine chaser in the Atlantic ports beyond the mine
fields and I would order a destroyer as protection for every vessel known
to be inward bound."

Secretary Daniels smiled.

"You wouldn't overlook anything, would you, Captain?"

"I certainly would not," said Jack firmly.

"Very well, then," said Secretary Daniels. "I'll set your mind at rest.
Your suggestions shall be followed out. I'll give the necessary directions
the first thing in the morning."

"In the morning, sir?" repeated Jack. "The morning may be too late."

"Oh, I guess not," Secretary Daniels smiled. "It has been three weeks or
more since your first warning and nothing has happened. I guess we can
safely depend upon being let alone a few hours after the second warning."

Jack was about to protest, thought better of it and said simply:

"Very well, sir."

A moment later the lads took their departure with the ambassador. In the
seclusion of the latter's automobile, Jack said:

"I can't see how the secretary dares let time slip by like that."

"Never mind," said the ambassador, "you'll find in a day or two that
Secretary Daniels knows what he's doing. Don't make any mistake about him.
He's a capable man."

"I have no doubt of that, sir," replied Jack. "But if he had seen three
years of war, as we have, he would never delay. Besides, he doesn't know
these German submarines as well as I do. Neither do any of the Americans."

"Oh, yes they do," declared Frank.

"They do, eh?" exclaimed Jack. "Well, I'd like to know the name of one of
them."

"His name," said Frank, "is Lieutenant Chadwick, and I think he knows just
about as much about the U-Boats as you do; and he agrees with your ideas
perfectly."

Jack smiled.

"That's right," he said. "I had forgotten you were a native of this land.
Well, here's hoping nothing happens before Secretary Daniels takes all
necessary pr