Strangers coming to New York should always be on the watch for pickpockets, and even natives are not careful enough in this respect. Picking pockets has been reduced to a science here, and is followed by many persons as a profession. It requires long practice and great skill, but these, when once acquired, make their possessor a dangerous member of the community. Women, by their lightness of touch and great facility in manipulating their victims, make the most dangerous operators in the city. The ferry boats, cars, stages, crowded halls, and public places afford the best opportunities to pickpockets for the exercise of their skill. A lady, riding in an omnibus, discovers that she has lost her purse, which she knows was in her possession when she entered the stage. A well-dressed gentleman sits by her, whose arms are quietly crossed before him, and his fingers, encased in spotless kid gloves, are entwined in his lap, in plain sight of all the passengers, who are sure that he has not moved them since he entered the stage. Several persons have entered and left the vehicle, and the lady, naturally supposing one of them to be the thief, gets out to consult a policeman as to her best course. The officer could tell her, after a glance at the faultless gentleman who was her neighbor, that the arms so conspicuously crossed in his lap, are false, his real arms all the time being free to operate under the folds of his talma. The officer would rightly point him out as the thief. On all the street cars, you will see the sign, "_Beware of pickpockets!_" posted conspicuously, for the purpose of warning passengers. These wretches work in gangs of two, or three, or four. They make their way into crowded cars, and rarely leave them without bringing away something of value. An officer will recognize them at once. He sees a well-known pickpocket obstructing the car entrance; another pickpocket is abusing him in the sharpest terms for doing so, while, at the same time, he is eagerly assisting a respectable gentleman, or a well-dressed lady, to pass the obstruction. One or two other pickpockets stand near. All this is as intelligible to a police officer as the letters on a street sign. He knows that the man, who is assisting the gentleman or lady, is picking his or her pocket; he knows that the man who obstructs the entrance is his confederate; he knows that the others, who are hanging about, will receive the contents of the pocketbook as soon as their principal has abstracted the same. He cannot arrest them, however, unless he, or some one else, sees the act committed; but they will not remain long after they see him--they will take the alarm, as they know his eye is on them, and leave the car as soon as possible. A detective one day noticed a pickpocket riding in a crowded stage on Broadway. Stopping the vehicle, he mounted the step, and said, "Gentlemen, there is a notorious pickpocket in this stage. It must stand still until he leaves it."