"We wanted to see if it was a circus poster, but it isn't," returned
Freddie.

"Well, come on back. Daddy will miss us," declared Bert. He started
back--at least he thought he did--for the place where their father had
told them to wait for him. But the subway station under the New York
sidewalks was so large and rambling, there were so many stairways leading
here and there, up and down, and there were so many platforms that it is
no wonder Bert went astray.

"Where are you going?" asked Nan at last.

"Well, I was trying to find the place father told us to wait," Bert
answered.

"It's over this way," said Nan, pointing just the other direction from the
one in which Bert was walking.

"All right, we'll try that, but it seems wrong," he stated.

They walked a little way in that direction. They saw nothing of their
father, however, and there were fewer people on the platform where they
now were.

"Oh, dear!" cried Flossie, "I'm thirsty! I want a drink!"

"So do I!" added Freddie.

Nan and Bert looked about them. They were still in the underground
station, and they could see trains coming in and going out, and crowds of