Introduction to the Science of Sociology

by Robert Ezra Park; E. W. Burgess

(4) Massart, J., and Vandervelde, É. Parasitism, Organic and Social. 2d ed. Translated by W. Macdonald. Revised by J. Arthur Thomson. London, 1907.

(5) Warming, Eug. Oecology of Plants. An introduction to the study of plant communities. Oxford, 1909. [Bibliography.]

(6) Adams, Charles C. Guide to the Study of Animal Ecology. New York, 1913. [Bibliography.]

(7) Waxweiler, E. "Esquisse d'une sociologie," Travaux de l'Institut de Sociologie (Solvay), Notes et mémoires, Fasc. 2. Bruxelles, 1906.

(8) Reinheimer, H. Symbiosis. A socio-physiological study of evolution. London, 1920.

III. THE CLASSIFICATION OF SOCIAL GROUPS

A. Types of Social Group

1. Non-territorial Groups:

(1) Le Bon, Gustave. The Crowd. A study of the popular mind. London, 1897.

(2) Sighele, S. Psychologie des sectes. Paris, 1898.