In all police organisations supported by cities there are two distinct kinds of officers, the uniformed men and the detectives. Among these the beginner will have to pick out his friends, and until he knows well the work of both classes of men he will be in a quandary as to which he desires to ally himself with. There are things in the detective's life which make it more attractive to some men than the policeman's, and _vice versa_. The two officers have different attitudes toward the criminal world, and the beginner will probably be decided in his choice according to the impression the different attitudes make upon him. The uniformed officer, or "Flatty," as he is called in the thief's jargon, if he remains upright and honest, arrests a successful professional criminal with the same _sang-froid_ and objectivity that are characteristic of him when arresting a "disorderly drunk." It is a perfunctory act with him; the offender must be shut up, no matter who he is, and he is the party paid to do it. The officer in citizen's clothes, the "Elbow," is a different kind of man. He realises as well as the "Flatty" that it is his business to try to protect the community which employs him, but he handles a prisoner, especially if the latter is a nicely dressed and well known thief, in a different way from the ostentatious manner of arrest characteristic of the ordinary policeman. It almost seems sometimes as if he were showing deference to his prisoner, and the two walk along together like two old acquaintances. The fact of the matter is that a truly successful professional thief is a very interesting man to meet, and he is all the more interesting to the officer if he has been able to catch him unawares and without much trouble. Realising what a big man he has got,--and thieves themselves have no better opinion of their ability than that which the detective has of it,--he likes to ask him about other big men, to get "wise," as the expression is. If it has been a hard chase, he also likes to go over the details of it, and find out who has doubled the most on his tracks. In time, if he keeps steadily at the business and learns to know a number of what are called "good guns" (clever thieves), he develops into a recognised successful thief-catcher; but he has spent so much of his time in fraternising with "guns," in order to learn from them, that he comes to think that his moral responsibility is over after he has located them. Technically, I suppose this is true; it is his business to catch, and the State must prosecute and convict. The point I would bring out, however, is that he is inclined to be lenient with his prisoner. To him the struggle has been merely one of intelligence and shrewdness; he has had to be quick and alert in capturing the "gun," and the latter has exercised all of his ingenuity in trying to escape. Moral issues have not been at stake; the thief has not stolen from the officer, and why should the latter not