“Gee, that’s the talk!” cried his twin merrily. “I’d like to place a couple in Codfish’s room.”

“He certainly deserves ’em,” added Fred. “He’s getting to be just as big a sneak as he ever was. All of our kindness to him seems to have been useless.”

“And I thought he was going to turn over a new leaf,” declared Jack. “I wonder if some of the other fellows haven’t been teasing him and that has made him go back to his old tricks.”

“I know one person I’d like to treat to some big snowballs!” broke out Fred. “That’s Professor Duke.”

“Oh, say! I’d like to square up with him myself,” burst out Andy. “Gee! he certainly did have it in for us yesterday.”

“Professor Duke is certainly a sour one—much worse than Asa Lemm ever dared to be,” came from Gif.

“I was thinking of Duke when I mentioned it,” said Randy. “You know he has his room in our building instead of with the other professors in Colonel Colby’s residence.”

“We don’t want to get in bad with the colonel,” remarked Fred seriously.

“Oh, I think we can fix it so that nobody will know who did it,” returned his cousin.

The matter was talked over for several minutes, and then, having agreed on their plan for more fun, the Rover boys and their chums set to work rolling a number of snowballs which were two feet or more in diameter. These they placed close to the school building at a point where there was a series of fire-escapes leading down from the upper halls of the institution.