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Rh and go to the Bronx, where the animals are."

They entered one of the many elevators, with a number of other persons who also wanted to go to the Woolworth tower, and, in a moment, the sliding doors were closed.

"Oh!" suddenly exclaimed Nan.

And Flossie, Freddie and Bert all said the same thing, while Mrs. Bobbsey clasped her husband's arm and looked rather queer.

"What's the matter?" asked her husband.

"Why, we're going up so fast!" exclaimed the children's mother. "It makes me feel queer!"

"This is an express elevator," said Mr. Bobbsey. "There are so many floors in this tall building that if an elevator went slowly, and stopped at each one, it would take too long to get to the top. So they have some express elevators, that start at the bottom floor, and don't stop until they get to floor thirty, or some such number as that."

"Are there thirty floors to this building?" asked Bert, as the elevator car, like a big cage in a tunnel standing on end, rushed up.

"Yes, and more," his father answered.