The magazine he wanted had been put away under a pile of papers, and as the boy was getting it out Flossie caught sight, down the platform, of a man pasting up on the advertising boards in the underground station, some new posters.
"Oh, maybe it's signs about a circus, Freddie!" cried the little girl. "Come on and watch!"
Freddie was always ready to go, and he had darted off after his sister down the long platform before Bert and Nan saw them. When the two older children missed the younger twins they looked hurriedly about for them.
"There they are—watching that bill-poster," said Bert. For the underground subway stations are much used by advertisers, gaily colored sheets of paper being pasted on boards put there for that purpose.
"You mustn't run away like that!" said Nan to Flossie, as she came up to her sister, to lead her back.
"We wanted to see if it was a circus poster, but it isn't," returned Freddie.
