“Oh, be careful!” murmured Miss Herron. “It’s very dangerous.”

“Very,” replied Archie. “Promise me Lucy and I’ll slow up.”

A sudden little shriek of joy and some handclapping from Mayer’s tonneau interrupted what the old lady might have answered. Glancing over, Miss Herron perceived that their rival had drawn ahead a yard or more, that the girls were crying taunts at her. Not far away now there showed a gleam of the river. And then Archie encountered the greatest surprise of his life.

“Saucy things!” remarked his passenger, and fell silent again.

“Come on!” called the prettiest of the three, through her hollowed hands. “Old freight car!”

“Archie!”

“Yes, Miss Herron?”

“Can’t you—— Oh!”

“What, ma’am?” From the tail of his eye he was aware that Miss Agatha was wringing her hands.

“Archie, they mustn’t beat us!”