One day a man named "Muir," a mean, sure-thing grafter, came to the stir on a visit to some of his acquaintances. He had never done a bit himself, although he was a notorious thief. But he liked to look at the misfortunes of others, occasionally. On this visit he got more than he bargained for. He came to the clothing department where Mike, who had grafted with Muir in New York, and I, were at work. Muir went up to Mike and offered him a bill. Mike threw it in Muir's face and called him--well, the worst thing known in Graftdom. "If it wasn't for you," he said, "I wouldn't be doing this bit." There are several kinds of sure-thing grafters. Some are crooked gamblers, some are plain stool-pigeons, some are discouraged thieves who continue to graft but take no risks. Muir was one of the meanest of the rats that I have known, yet in a way, he was handy to the professional gun. He had somebody "right" at headquarters and could generally get protection for his mob; but he would always throw the mob over if it was to his advantage. He and two other house-work men robbed a senator's home, and such a howl went up that the police offered all manner of protection to the grafter who would tip them off to who got the stuff. Grafters who work with the coppers don't want it known among those of their own kind, for they would be ostracized. If they do a dirty trick they try to throw it on someone else who would not stoop to such a thing. Muir was a diplomat, and tipped off the Central Office, and those who did the trick, all except Tom and Muir, were nailed. A few nights after that the whisper was passed among guns of both sexes, who had gathered at a resort up-town, that somebody had squealed. The muttered curses meant that some Central Office man had by wireless telegraphy put the under world next that somebody had tipped off the police. But it was not Muir that the hard names were said against: the Central Office man took care of that. With low cunning Muir had had the rumor circulated that it was Tom who had thrown them down, and Tommy was ostracized.