"For gracious sake! what's that racket?" exclaimed Dick Rover, as he threw down the newspaper he was reading and leaped to his feet. "Sounds to me as if there was a battle royal going on," returned his younger brother, Sam, who was at a desk in the library of the old farmhouse, writing a letter. "It's those boys!" exclaimed Tom Rover, as he tossed aside a copy of a comic paper which he had been looking over. "I'll wager they're up to some mischief again."