e of the roof.

"It's wonderful!" said Dorothy.

"Suppose we let Eureka go down to the street and get some one to help
us," suggested Zeb, who had been even more amazed than Dorothy at these
strange happenings.

"Perhaps we can walk on the air ourselves," replied the girl.

Zeb drew back with a shiver.

"I wouldn't dare try," he said.

"Maybe Jim will go," continued Dorothy, looking at the horse.

"And maybe he won't!" answered Jim. "I've tumbled through the air long
enough to make me contented on this roof."

"But we didn't tumble to the roof," said the girl; "by the time we
reached here we were floating very slowly, and I'm almost sure we could
float down to the street without getting hurt. Eureka walks on the air
all right."

"Eureka weights only about half a pound," replied the horse, in a
scornful tone, "while I weigh about half a ton."

"You don't weigh as much as you ought to, Jim," remarked the girl,
shaking her head as she looked at the animal. "You're dreadfully
skinny."

"Oh, well; I'm old," said the horse, hanging his head despondently,
"and I've had lots of trouble in my day, little one. For a good many
years I drew a public cab in Chicago, and that's enough to make anyone
skinny."

"He eats enough to get fat, I'm sure," said the boy, gravely.

"Do I? Can you remember any breakfast that I've had today?" growled
Jim, as if he resented Zeb's speech.

"None of us has had breakfast," said the boy; "and in a time of danger
like this it's foolish to talk about eating."

"Nothing is more dangerous than being without food," declared the
horse, with a sniff at the rebuke of his young master; "and just at
present no one can tell whether there are any oats in this queer
country or not. If there are, they are liable to be glass oats!"

"Oh, no!" exclaimed Dorothy. "I can see plenty of nice gardens and
fields down below us, at the edge of this city. But I wish we could
find a way to get to the ground."

"Why don't you walk down?" asked Eureka. "I'm as hungry as the horse
is, and I want my milk."

"Will you try it, Zeb?" asked the girl, turning to her companion.

Zeb hesitated. He was still pale and frightened, for this dreadful
adventure had upset him and made him nervous and worried. But he did
not wish the little girl to think him a coward, so he advanced slowly
to the edge of the roof.

Dorothy stretched out a hand to him and Zeb put one foot out and let it
rest in the air a litt