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582 In many of the European cities, and to some extent in this country, reconstruction of city life has gone to the length of building garden suburbs, or replacing unhealthful and run-down tenements with model buildings owned and controlled by the municipality.

In American cities the attempt has been made to renovate evil neighborhoods by the construction of playgrounds and the introduction of supervised sports of various kinds, including municipal dances in municipal dance halls. These and other devices which are intended primarily to elevate the moral tone of the segregated populations of great cities should be studied in connection with the investigation of the neighborhood in general. They should be studied, in short, not merely for their own sake but for what they can reveal to us of human behavior and human nature generally. Colonies and segregated areas.—In the city environment the neighborhood tends to lose much of the significance which it possessed in simpler and more primitive forms of society. The easy means of communication and of transportation, which enables individuals to distribute their attention and to live at the same time in several different worlds, tends to destroy the permanency and intimacy of the neighborhood. Further than that, where individuals of the same race or of the same vocation live together in segregated groups, neighborhood sentiment tends to fuse together with racial antagonisms and class interests. In this way physical and sentimental distances reinforce each other, and the influences of local distribution of the population participate with the influences of class and race in the evolution of the social organization. Every great city has its racial colonies, like the Chinatowns of San Francisco and New York, the Little Sicily of Chicago, and various other less pronounced types. In addition to these, most cities have their segregated vice districts, like that which until recently existed in Chicago, and their rendezvous for criminals of various sorts. Every large city has its occupational suburbs like the Stockyards in Chicago, and its residence suburbs like Brookline in Boston, each of which has the size and the character of a complete separate town, village, or city, except that its population is a selected one. Undoubtedly the most remarkable of these cities within cities, of which the most interesting