“Perfectly clear, sir,” replied Harold. “I’ll just make a note of that code, if you don’t mind, sir.”

“No, make no notes!” commanded the Professor. “I have purposely contrived the code so simply that you can carry it in your head. You must realize that our actions will very probably be watched, in fact, I should not be surprised to learn that they have been under observation for some considerable time. Now, the next thing I want you to do is to type out a few copies of this paragraph and distribute them to the news agencies.”