(3) Tarde, G. L'opinion et la foule. Paris, 1901.
(4) Fahlbeck, Pontus. Klasserna och Samhallet. Stockholm, 1920. (Book review in American Journal of Sociology, XXVI [1920-21], 633-34.)
(5) Nesfield, John C. Brief View of the Caste System of the North-western Provinces and Oudh. Allahabad, 1885.
2. Territorial Groups:
(1) Simmel, Georg. "Die Grossstädte und das Geistesleben," Die Grossstadt, Vorträge und Aufsätze zur Städteausstellung, von K. Bücher, F. Ratzel, G. v. Mayr, H. Waentig, G. Simmel, Th. Peterman, und D. Schäfer. Dresden, 1903.
(2) Galpin, C. J. The Social Anatomy of an Agricultural Community. Madison, Wis., 1915. (Agricultural experiment station of the University of Wisconsin. Research Bulletin 34.) [See also Rural Life, New York, 1918.]
(3) Aronovici, Carol. The Social Survey. Philadelphia, 1916.
(4) McKenzie, R. D. The Neighborhood. A study of local life in Columbus, Ohio. Chicago, 1921 [in press].
(5) Park, Robert E. "The City. Suggestions for the Investigation of Human Behavior in the City Environment," American Journal of Sociology, XX (1914-15), 577-612.
(6) Sims, Newell L. The Rural Community, Ancient and Modern. New York, 1920.