the hotel, in just one hour. One hour--remember."

"Have you a telescope?" inquired Eph, calmly.

"A telescope. Eh?" inquired the German. "What for?"

"You might need it in looking for us," Eph replied.

"Then, in one hour, I shall see you--at the hotel!"

"You'll be lucky, if you do," grinned Eph.

"Eh? I do not know that I understand," responded Herr Professor Radberg,
slowly.

"If you're figuring on seeing us," Eph went on, gravely, "I'm afraid
you're in for bad news."

"Bad news? Ach! What do you mean, young man?"

"Just what I said," replied Eph.

Professor Radberg looked so puzzled that Hal Hastings broke in, quietly:

"Professor, unless I'm much in error, you want to see us about a
proposition that we enter the German naval service."

"Hush! Not so loud," warned Radberg, looking suspiciously around.

"There's nothing we have to keep quiet about," Hal went on. "You have