ld 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
people hurrying to and fro. But they could not see their father nor the
place where he had told them to wait. At last Nan said:

"Bert, I don't know where we are! We're lost!"

CHAPTER XI

FREDDIE AND THE TURTLE

Bert Bobbsey looked all around the big underground subway station before
he answered Nan. Then he took off his cap to scratch his head, as he often
did while thinking. Next he looked down at Flossie and Freddie.

If he thought he was going to find the two little twins in a fright at
what Nan had said about being lost, Bert was mistaken. The two
flaxen-haired tots were looking down the long platform, into the gloom of
the long tunnel of the subway.

"Aren't they funny, Freddie?" asked Flossie.

"Yep, awfully funny," was Freddie's answer.

"What's funny?" asked Bert, wishing he could see something at which to
laugh.

"Those red and green lights down the track," explained Freddie. "They
blink so funny and come up and go out----"

"Just like winking at you," said Flossie. "I like it down here. It isn't
like the dark tunnels we went in on the steam cars."

"Well, I'm glad _somebody_ likes it," said Bert to Nan. "But say, how do
we get out of here?"

"I'm sure I don't know," she said. "When I ran after Flossie I didn't look
which way I was going."

"I didn't, either. Queer how we could get lost in a place like this," and
Bert seemed worried and spoke more loudly than he intended. Freddie heard
what his brother said and looked up quickly.

"Are we _really_ lost?" he asked.

"It seems so," answered Nan. "I ran after you two, and we have walked
about so many platforms and up and down so many stairs that I can't see or
remember the place where Father told us to wait for him."

"Well, there's no danger, that's sure," said Bert. "It's a queer place to
be lost in--a subway station. I was never in one before, but if we