"How much, in all Germany?" demanded the Professor. "Nein! How should
I know?"

"You expect me, of course, to turn my back on this country for good, to
tell you Germans whatever I may know about submarine secrets, to drill
with your navy, and be prepared to fight in your navy if war comes?"

"Ach, yes! of course," replied Radberg. "Now, we are beginning to
understand one another."

"Professor," interrupted Captain Jack Benson, "we've had enough of
joking."

"Joking? I assure you--"

"Professor," once more broke in the submarine boy, "_I wouldn't sell out
my country's flag for all the money you ever saw!_"

For a few moments the Professor's face was a study in consternation.
Then he broke forth, angrily:

"Ach! You are a fool!"

"I guess so," nodded Jack, without resentment. "That's just the kind
of fools we Americans are generally."

Herr Radberg was a good enough reader of human faces to realize that,
at all events, there was no use in continuing the conversation at
present.