With this introduction we shall not seek it long anywhere in the city. Below Houston Street the door-bell in our age is as extinct as the dodo. East of Second Avenue, and west of Ninth Avenue as far up as the Park, it is practically an unknown institution. The nearer the river and the great workshops the more numerous the tenements. The kind of work carried on in any locality to a large extent determines their character. Skilled and well-paid labor puts its stamp on a tenement even in spite of the open door, and usually soon supplies the missing bell. Gas-houses, slaughter-houses and the docks, that attract the roughest crowds and support the vilest saloons, invariably form slum-centres. The city is full of such above the line of Fourteenth Street, that is erroneously supposed by some to fence off the good from the bad, separate the chaff from the wheat. There is nothing below that line that can outdo in wickedness Hell's Kitchen, in the region of three-cent whiskey, or its counterpoise at the other end of Thirty-ninth Street, on the East River, the home of the infamous Rag Gang. Cherry Street is not "tougher" than Battle Row in East Sixty-third Street, or "the village" at Twenty-ninth Street and First Avenue, where stores of broken bricks, ammunition for the nightly conflicts with the police, are part of the regulation outfit of every tenement. The Mulberry Street Bend is scarce dirtier than Little Italy in Harlem. Even across the Harlem River, Frog Hollow challenges the admiration of the earlier slums for the boldness and pernicious activity of its home gang. There are enough of these sore spots. We shall yet have occasion to look into the social conditions of some of them; were I to draw a picture of them here as they are, the subject, I fear, would outgrow alike the limits of this book and the reader's patience. It is true that they tell only one side of the story; that there is another to tell. A story of thousands of devoted lives, laboring earnestly to make the most of their scant opportunities for good; of heroic men and women striving patiently against fearful odds and by their very courage coming off victors in the battle with the tenement; of womanhood pure and undefiled. That it should blossom in such an atmosphere is one of the unfathomable mysteries of life. And yet it is not an uncommon thing to find sweet and innocent girls, singularly untouched by the evil around them, true wives and faithful mothers, literally "like jewels in a swine's snout," in the worst of the infamous barracks. It is the experience of all who have intelligently observed this side of life in a great city, not to be explained--unless on the theory of my friend, the priest in the Mulberry Street Bend, that inherent purity revolts instinctively from the naked brutality of vice as seen in the slums--but to be thankfully accepted as the one gleam of hope in an otherwise hopeless desert.