“Excuse me, Professor, but I don’t know what you’re talking about,” answered another voice; and at this Jack gave a slight start, for he recognized the words as coming from Brassy Bangs.

“What is that? You do not know anything about the big snowball that just came hurtling down these stairs?” stormed Professor Duke.

“No, sir. I just reached the top of the stairs,” answered Brassy Bangs. “I came out of my room not ten seconds ago.”

“What do you know about this, Stowell?” went on the professor, who had now come slowly to the top of the stairs, followed by Professor Grawson, who had come out of Colonel Colby’s private office where he had been looking over some reports when the big snowball had landed with a thump against the desk at which he had been seated.

“Me? What do you mean?” stammered the youth who was known to the cadets as Codfish and who had always been more or less of a sneak.

“Somebody just rolled a big snowball down the stairs. It struck me and nearly knocked me flat,” returned the irate teacher.

“Yes, and it rolled all the way into the private office,” added Professor Grawson.

“I don’t know anything about any snowballs,” said Codfish. “I noticed the floor was all wet and I wondered what it meant.”

“I saw some fellows rushing around the corner,” came from Brassy Bangs.

“Who were they?” demanded Snopper Duke.