"Well, well! I don't fancy you'll have to fight," said Frank, whose conscience was beginning to smite him.
"Then I'll have to apologize, and I'll be jiggered if I know what I'm going to apologize for!"
"What makes you so sure you'll have to apologize?"
"Look at this—read it!"
The professor drew an envelope from beneath his pillow and passed it to Frank. The envelope contained a note, which the boy was soon reading. It was from Colonel Vallier, and demanded an apology, giving the professor until the following noon in which to make it, and hinting that a meeting of honor would surely follow if the apology was not forthcoming.
"Whew!" whistled Frank. "This does seem like business. When did you receive this?"
"Shortly after you went out."
"I scarcely thought the colonel would press the affair."
"There's a letter for you on the table."
"From whom is it?"