elgium.

The way in which the natives made use of sturdy-looking dogs, harnessed
in small carts, and trained to do their duty in order to earn their
keep, was perhaps the most interesting thing that held their attention.

"Why," remarked Merritt, "they use dogs for nearly everything. Dozens
of milk peddlers have teams to drag their big brass cans around. Then
there are the hucksters, like we have over in New York, only these
fellows peddle from carts drawn by dogs. We saw one poor, four-footed
wretch roped to a treadmill, and doing the family churning; so I guess
Belgium must make the dog traffic pay right well."

"And think of dogs drawing a quick-firing gun, which we saw in that
street where the soldiers were getting ready to go to the front!"
exclaimed Tubby. "I think that was the queerest sight ever."

"I can plainly see," Rob told them, "that while we're over here we are
bound to keep our eyes wide open all the time because there are so many
things that strike us as being queer just because we've been used to
other ways. These people would stare at many of the things we think are
common."

"What are you looking at now, Tubby?" asked Merritt, seeing that the
boy, who had gained his name because after a fashion he resembled a tub
of butter, was in the act of stretching his fat neck in order to see
something that had attracted his attention.

"Why, I was wondering what made all the people crook their necks like
that, and look up in the air. Is there a German Zeppelin heaving in
sight? I don't seem to glimpse any big dirigible up there; do you,
fellows?"

"What's that moving along away up near the clouds?" demanded Merritt.

"It must be an aeroplane," said Tubby. "I just heard somebody say my
name close by; but he pointed up at that flier. What could he have
meant, Rob?"

"I think I can tell you," replied the other scout. "German aeroplanes
are called Taubes, and it sounded like your name. They say that is an
aeroplane spy up there!"

CHAPTER II.

THE AERIAL MAP-MAKER.

"He's flying pretty high, let me tell you," said Tubby, straining his
neck in an endeavor to watch the evolutions of the far-distant object
sailing on the border of the cloud, and which looked so much like a
great bird with outstretched wings.

"And all the while he is using his powerful field-glass to watch things
going on below," added Rob. "I wouldn't be surprised if those chaps make
a rough map, as they go over a place, with