An excellent case study of the situation in a modern European city. (VII, 1; X, 1, 2.)

——. “Einheimische und Zugezogene in den Grossstädten,” Zeitschr. für Sozialwiss., VII (Berlin, 1904), 660–67.

Ravenstein, E. G. “The Laws of Migration,” Jour. Royal Statist. Soc., XLVIII (1885), 167–227. (X, 2.)

Spencer, A. G. “Changing Population of Our Large Cities,” Kindergarten Primary Mag., XXIII (1910), 65–71.

Steinhart, A. Untersuchung zur Gebürtigkeit der deutschen Grossstadtbevölkerung, Entwicklung, und Ursachen, “Rechts und Staatswissenschaftliche Studien,” Heft 45 (Berlin, 1912). (VIII, 1; X, 2.)

Voss, W. “Städtische Kleinsiedlung,” Archiv für exacte Wirtschaftsforschung, IX (1919), 377–412.

Weisstein, G. “Sind die Städte wirklich Menschenverzehrer?” Deutsche Städte Ztg. (1905), pp. 153–54.

4. The mobility of a city population incident to city growth is reflected in the increased number of contacts, changes of movement, changes in appearance, and atmosphere of specific areas due to succession of population groups, and in differences in land values. Mobility implies not mere movement, but fresh stimulation, an increase in number and intensity of stimulants, and a tendency to respond more readily to new stimulation. The process by which the city absorbs and incorporates its own offspring or foreign elements into its life, and what becomes of them, may be referred to as the metabolism of city life. Mobility is an index of metabolism.

Bercovici, Konrad. Around the World in New York (New York, 1924).

Discusses the local communities and the sifting process in the large city. (VII, 1, 2; IX, 3; V, 1, 2, 3.)