“Here comes a motor-boat!” exclaimed Fred presently, pointing up the river. “I wonder if it’s one of our boats coming to meet us.”

“I hope it is,” returned Randy. “I’d much rather be towed back than do more rowing.”

“It isn’t one of our boats,” said Jack, a few seconds later. “Our boats are all striped white and blue. This one is green and yellow.”

“Green and yellow!” exclaimed Andy. “Why, that’s the color of some of the Longley boats! To my mind they are the ugliest things on the lake.”

It was indeed a motor-boat belonging to Longley Academy, and as it came closer the Rovers noted that it contained four cadets, two in khaki outing uniforms and the other two in the brilliant uniforms used by the Longley cadets when on parade.

“Gee! how those fellows do love to show off those uniforms,” remarked Fred.

“Maybe that’s the only suit of clothes they have to their backs,” chuckled Andy.

The motor-boat coming down the river occupied the middle of the stream. As it reached the vicinity of the little island just mentioned it should have turned to the other channel from that being used by the Rover boys. Instead, however, it came rushing straight towards them.