“Look here,” exclaimed Harry eagerly. “Do you remember some time ago my saying I was certain sure I’d seen Cotton before somewhere?” The Duke shook his head doubtfully. “I don’t remember. Maybe. Well?” “I was positive I’d seen him, even talked to him. It bothered me a lot. I used to stare at him in class and cudgel my brains about it, but I couldn’t place him. But I was right all the time, and this gave me the clue.” He tapped the stamp catalogue on his knee. “And when you said he was a stamp collector it all came back to me like a flash.” “Well, go on; where did you meet him?” “Do you remember two years ago when some of the fellows went to Broadwood one night and put a sign on the campus?” “Sure!” “Well, I don’t know whether you ever knew who the fellows were, but I did. And one day I got a letter from a fellow named Charles Cotton, at Broadwood――――” The Duke whistled. “――――asking me to exchange stamps with him; duplicates, you know. We arranged a meeting in Greenburg, at Wallace’s, and we got together there and chinned awhile. I think we made one or two swaps, but I don’t remember for certain. Anyway, it turned out that what Cotton really wanted was to find out the names of the fellows who had played the trick on Broadwood. You remember how mad they were over there? Well, Cotton had a stamp――it was a blue Cape of Good Hope――that I wanted terribly. I offered him a lot of revenues for it――he was rather keen on revenues――but he wouldn’t let go; wanted four or five dollars cash, I think. Finally, though, he as much as said that if I’d tell him the names of the fellows who had been at Broadwood that night he’d make me a present of the stamp. But I got suspicious and finally went away. You know they did learn who one of the fellows was.” Harry paused, darting a doubtful glance at The Duke. The latter nodded. “I remember. You had a grouch with Thompson and squealed on him. If I’d been Thompson I’d have broken your neck.” “I deserved it,” replied Harry. “I must have been an awful little brute then. But I didn’t realize what I was doing, and I was good and sorry for it afterward, Duke.” The Duke nodded again. “We always are when it’s too late. But never mind about that. You and Thompson made it up all right. So that was Cotton, was it? By Jove, I can well believe it! It’s just the sort of thing I could imagine him doing. If I wanted a piece of dirty work done, Merrow, I’d ask Cotton to do it. That’s the way he’s impressed me all along. And to think that I’ve got to have him on my hands the rest of the year!” “But why do you suppose he doesn’t own up to having been at Broadwood two years ago?” “Probably ashamed of it. Maybe he left under a cloud. It’s a fair wager he did, too. I’m blessed if I’m going to have him in here with me, Merrow. He will have to change his room. If he won’t, I’ll make it so hot for him he won’t want to stay here! You don’t mind if I make use of what you’ve told me?”