“I told you I’d got to learn it better, didn’t I?” asked Mr. Critz impatiently. “You’d be capper, and you’d guess which shell the pea was under. No matter which you guessed, I’d leave it under that one, so’d you’d win, and you’d win ten dollars every time you bet—but not for keeps. That’s why I’ve got to have an honest capper.”

“I can see that,” said Mr. Gubb; “but what’s the use lettin’ me win it if I’ve got to bring it back?”

“That starts the boobs bettin’,” said Mr. Critz. “The boobs see how you look to be winnin’, and they want to win too. But they don’t. When they bet, I win.”

“That ain’t a square game,” said Mr. Gubb seriously, “is it?”

“A crook ain’t expected to be square,” said Mr. Critz. “It stands to reason, if a crook wants to be a crook, he’s got to be crooked, ain’t he?”

“Yes, of course,” said Mr. Gubb. “I hadn’t looked at it that way.”

“As far as I can see,” said Mr. Critz, “the more I know how a detective acts, the better off I’ll be when I start in doin’ real business. Ain’t that so? I guess, till I get the hang of things better, I’ll stay right here.”

“I’m glad to hear you say so, Mr. Critz,” said Mr. Gubb with relief. “I like you, and I like your looks, and there’s no tellin’ who I might get for a roommate next time. I might get some one that wasn’t honest.”

So it was agreed, and Mr. Critz stood over the washstand and manipulated the little rubber pea and the three shells, while Mr. Gubb sat on the edge of the bed and studied Lesson Eleven of the “Rising Sun Detective Agency’s Correspondence School of Detecting.”

When, presently, Mr. Critz learned to work the little pea neatly, he urged Mr. Gubb to take the part of capper, and each time Mr. Gubb won he gave him a five-dollar bill. Then Mr. Gubb posed as a “boob” and Mr. Critz won all the money back again, beaming over his spectacle rims, and chuckling again and again until he burst into a fit of coughing that made him red in the face, and did not cease until he had taken a big drink of water out of the wash-pitcher. Never had he seemed more like a kindly old gentleman from behind the candy counter of a small village. He hung over the washstand, manipulating the little rubber pea as if fascinated.