the French, English or American fliers had met his death. But toll
had been taken of the Boches--ample toll, too.

The first inquiry Tom and Jack had made on their arrival at their
former aerodrome had been for news of Harry Leroy, but none had been
received.

It was when Tom and Jack were about to conclude their visit to their
former comrades of the air that an incident occurred which made a
great change in their lives. One sunny afternoon there suddenly
appeared, a mere speck in the blue, a single aeroplane.

"Some one of your men must have gone a long way over Heinie's
lines," remarked Jack to one of the French officers.

"He is not one of our men. Either they were all back long ago or
they will not come back until after the war--if ever. That is a Hun
machine."

"What is he doing--challenging to single combat?" asked Tom, as the
lone plane came on steadily.

"No," answered the officer, after a look through his glasses. "I
think he brings some messages. We sent some to the Germans
yesterday, and I think this is a return courtesy. We will wait and
see."

Nearer and nearer came the German plane. Soon it was circling
around the French camp. Hundreds came out to watch, for now the
object of the lone aviator was apparent. He contemplated no raid.