"I'll have a try at it," said Salter. "Look here, will you drop this quitter's talk about not running if I do the trick?" Rob hesitated. He knew little of Salter personally, but on general principles he felt himself safe. No fellow could know the whole four hundred and fifty originals in the plane geometry, and if Salter was like the average sport he couldn't know a dozen. Besides, Salter's geometry dated from the preceding year. To accept would be the easiest way to get rid of him. "All right," he rejoined, smiling, "but it's like getting money for nothing." He stated the theorem slowly and distinctly, so as to take no unfair advantage. "Want it repeated?" he asked, leering triumphantly into the serious face of his companion, whose knitted brow and abstracted expression showed that he was thinking hard. "No, I don't," replied the senior, suddenly breaking into a satisfied grin. "It's too dead easy. Look here!" He drew forth a block of paper from one pocket, a fountain pen from another, with a single flourish of the pen made an almost perfect circle on the paper, and rapidly threw in chords and tangents and added letters. "That's what you want to prove, isn't it? Well, this is the way it's done." At the end of a minute Rob stood with the slip of paper in his hand blushing to think that he had made so much of a simple matter, while Salter was calmly replacing his block and pen in his pockets. "You're in for it, all right. Of course, you know, I don't mean that you're sure of the team, but you've got a mighty good show, unless something unusual happens. There's Strong now." Strong stopped just long enough to congratulate Owen on his trial, and to tell him he had a good show for a position. The captain was followed by the trainer. When Rob emerged from the gymnasium a few minutes later he carried in his hand Salter's notes, and in his mind certain regular practice appointments with Collins. Startlingly sudden as had been his precipitation into the ranks of the relay men, he felt less elation on this account than amazement at the quickness with which the senior had opened a rift in the obscurity of the geometry. How could a fellow like Salter, who didn't look remarkably clever and certainly hadn't studied geometry for at least six months, give an impromptu demonstration like that! Was that the way in which originals were to be solved? If so, Rob Owen might as well get accustomed to a back seat; such feats were hopelessly beyond his slow powers! Unreconciled to the notion that an hour of his time was not equivalent to a minute of another's, he stopped at Lindsay's room to ask for information. "Salter? Of course I know him,--a good fellow he is, a perfect shark at lessons. You couldn't expect a man of his build to be athletic. What do you want to know about him?" Rob told his tale, adding rather shamefacedly that he suspected there was some trick about it.