But Dan only grinned at him. The wind filled the sail almost immediately and the motor-iceboat staggered away from Bromley’s dock. The old boatman stood there and watched them with a grim face, for the new craft started very slowly. She seemed really to hobble at first.

“Them boys air going to be disappointed—by jings!” muttered Bromley. “And that’s too bad. But these yere new-fangled notions——”

“By gravey! what’s happened?”

Suddenly the “put, put, put!” of the engine reached his ears. And at the same time the sail filled and bellied full. The motor-iceboat leaped ahead, the exhaust became a rumble, and the Follow Me shot up the river faster—it seemed to Bromley—than he had ever seen any craft move before.

She crossed the frozen stream diagonally and in two minutes was out of sight behind the humpback of Island Number One! Her disappearance left the old man breathless.

“Some boat—that,” said a voice behind him.

“Heh?” exclaimed John Bromley, turning to see a strange man standing coolly on his private wharf.

“That’s a fine sailer,” said the stranger.

“Mebbe ’tis,” returned John, eyeing the man fixedly.

The latter was a keen-looking chap, lean and wiry, and dressed in a long, loose, gray ulster, buckled about his waist with a belt. He returned the old boatman’s look, after a moment, with interest.