and see why he hasn't answered any of my messages. When I
once see him, and know he's all right, I'll feel better."

"Even capable of eating that dinner you claim to have won from me?"
asked Jack.

"Of course."

The two Air Service boys had the satisfaction of seeing the "tip" they
gave acted on, for as they left the station they observed the officer
to whom they had reported, detailing a man in plain clothes, evidently
one of the secret police, to follow the man they had watched in the
dining car.

"We can leave the rest to the military," said Tom. "And now let's get to
where we're going."

"Hadn't we better arrange for hotel accommodations, or to stop at a
pension?" asked Jack. "You know Paris is crowded now, even in war times,
and we've got to stay here all night, even if we learn that your father
hasn't yet arrived."

"That's so," agreed Tom. "Maybe we had better get a place to bunk
first."

It would not have been an easy task had they not worn the uniforms of
aviators. But once these were noted, they were welcomed with smiles, and
though at the first place they applied there was no room, the proprietor
busied himself to such advantage that the boys were soon settled in a
big double room with a fine view of a busy section of Paris.

On every side was seen evidence of the joy and satisfaction felt at the
showing made by the progress of the United States in her war programme.

The stars and stripes were seen floating from many staffs, mingled with
the tricolor of France and the English union jack. That Uncle Sam had
at last gotten beyond the bounds of patience with a ruthless and
sneaking enemy and was making energetic warfare against him was welcome
news to those who had so long borne the unequal brunt of battle.

"Americans? Ah, everything that I have is yours!" the hotel proprietor
told Tom and Jack. "You have but to ask. And now come, I will show you
the way to the cellar."

"But we don't care to see the cellar," remarked Tom in wonder. "No doubt
it is a very fine one, monsieur," he added in his best French, which was
nothing to boast of. "No doubt it is most excellent, but we don't care
for cellars."

"Ah, I know, but it is for protection in case of an air raid that I show
it to you. It is there we all take shelter. There have been raids, and
there will be more. It is well to be prepared. It is a well-protected
cellar."

"Oh, well, that's different," observed Jack. "Come on, Tom, we'd better
le