Just then a small messenger boy came up to Patty and handed her a telegram.

"Just as I thought!" exclaimed Patty. "They've done some crazy thing."

Opening the yellow envelope, she read:

"Took wrong train. Carried through to Philadelphia. Back this evening. BOB."

"Well, then, they can't get here until that nine-o'clock train comes in," said Kenneth, "so there's no use in your waiting any longer now."

"No, I suppose not," said Patty; "I'm awfully disappointed. I wish they had come."

An east-bound train had just come into the station, and Patty and Kenneth stood idly watching it, when suddenly Patty exclaimed:

"There they are now! Did you ever know such ridiculous people?"

CHAPTER XX

A FAIR EXCHANGE