hippopotamus would bite anyone, for he
was behind big, strong, iron bars, and could not get out. There was also
a baby hippopotamus, swimming around in a tank with the mother.

Bunny and Sue saw many other animals in Central Park, and then, as he
was getting hungry, and as he began to think his mother might be
wondering where he was, Bunny said to Sue that they had better go back
home.

"All right," Sue answered. "I'm tired, too."

They went back to where they had left the automobile taxicab.

"Well, did you see enough?" the man asked them.

"Yes," Bunny answered, "and now we want to go home, if you please."

"All right," said the man. He knew just where to take Bunny and Sue, for
he remembered where he had found them, right in front of Aunt Lu's
house. So the two children did not get lost this time, though they had
gone a good way from home.

"Thank you very much," said Bunny as he and Sue got out.

The automobile man laughed, as Bunny and Sue started up the front steps,
and then he called to them:

"Wait a minute, little ones, I must have some money for giving you a
ride."

"Oh!" exclaimed Bunny. "I--I thought you gave folks rides for nothing.
Wopsie said you did."

"Well, I don't know who Wopsie is," said the cab man, "but I can't
afford to ride anyone around for nothing. You'd better tell your mother
that I must be paid."

"Oh, I'll tell her," said Sue. "Mother or Aunt Lu will pay you."

"I'll come up with you I guess," said the automobile man, and he rode up
in the elevator with Bunny and Sue.

And you can guess how surprised Mrs. Brown and Aunt Lu were when the two
children came in.

"Oh, where have you been?" cried Mother Brown. "We've been looking all
over for you; up on the roof, down in the basement, out in the
street--and Wopsie was just going to ask the policeman on this block if
he had seen you. Where have you been?"

"Riding," answered Bunny.

"Up in Central Park, to see a elephant," added Sue.

"And we had a good time," Bunny went on.

"And now the automobile man wants some money, and we haven't any so you
must pay him, Mother," said Sue.

"We--we thought we were riding for nothing," Bunny explained.

Mrs. Brown and Aunt Lu looked at the automobile man, who smiled, and
told how the children had called to him, and asked him to give them a
long ride.

"Which I did," he said. "I thought their folks had maybe sent them to
get the air, as folks often do here, and--"

"Oh, it isn