The best study of a city people and the influence of city life on their mentality. (IX, 1, 4; X, 3.) Spengler, Oswald. _Der Untergang des Abendlandes: Umrisse einer Morphologie der Weltgeschichte_, Vol. II (München, 1922), chap. II, “Städte und Völker,” pp. 100–224. (II; VII, 1, 5; IX, 1.) Winter, Max. _Das Goldene Wiener Herz_, Vol. XI in “Grossstadt Dokumente” (Berlin, 1905). A study of the financial nexus in city life. (IX, 4.) Woolston, H. “The Urban Habit of Mind,” _Amer. Jour. Sociol._, XVII, 602 ff. 3. The medium through which man is influenced and modified in the city is the intricate system of communication. The urban system of communication takes on a special form. It is not typically the primary, but the secondary, contact that it produces. The public opinion that is built up in the city and the morale and _ésprit de corps_ growing out of it relies on such typical media as the newspaper rather than the gossip monger; the telephone and the mails rather than the town meeting. The characteristic urban social unit is the occupational group rather than the geographical area. Chicago Commission on Race Relations. _The Negro in Chicago_ (Chicago, 1922). A study growing out of the Chicago race riots, showing the growth of public opinion and the behavior of crowds and mobs in the city. (V, 1, 3; VII, 2.) Follett, Mary P. _The New State: Group Organization the Solution of Popular Government_ (New York, 1918). Analyzes the conditions under which public opinion of today is formed and suggests local organization as a possible way out. (V, 3; VII, 5; IX, 1.) Howe, Frederic C. “The City as a Socializing Agency,” _Amer. Jour. Sociol._, XVII, 509 ff. (VII, 5.) ——. _The City: The Hope of Democracy_ (New York, 1905). Has chapters on the new city civilization, the causes of political corruption, and gives a general description of city life, showing in particular the problems of public opinion it creates. (V; VI; VII, 1, 2.) Park, Robert E. “The Immigrant Community and the Immigrant Press,” _American Review_, III (March-April, 1925), 143–52. (V, 3.) Triton (pseudonym). _Der Hamburger “Junge Mann,”_ Vol. XXXIX in “Grossstadt Dokumente.” Shows the effect of the city and the contacts it makes possible on the development of an _ésprit de corps_ and a type. In this case the young office clerks of Hamburg are shown to be a product of the international character of the port of Hamburg. (IV, 6; IX, 1, 2, 4.)