"We are now approaching the Kaiser's apartment," that worthy stated, with a show of reverence as he pronounced the title of his superior. "You shall not talk until you are asked to do so."

"Correct!" came Jimmie's reply. "We will keep as still as mice."

The three were admitted in response to the officer's knock, and the boys found that the little compartment was now somewhat crowded. Their presence filled the place until there was not a vacant seat.

For some moments as the train rolled along the upgrade the Kaiser paid no attention to them, busying himself over a bundle of papers.

At length he looked up and searched the boys carefully with his piercing gaze. After he had apparently taken a complete inventory of the two boys—one in the uniform of his own Uhlans and the other in the uniform of the Boy Scouts—he turned to one of his aides.

"What is the charge you wish to bring against these young men?"

"That of being spies and tampering with the aeroplane last night!" came the startling answer.

CHAPTER XVIII

PURSUIT