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