(6) Somló, F. Der Güterverkehr in der Urgesellschaft. "Zum Ursprung der Kastenbildung," pp. 157-59. Instituts Solvay: Travaux de l'Institut de Sociologie. Notes et mémoires, Fascicule 8. Bruxelles, 1909.
(7) Ratzel, Friedrich. Völkerkunde. I, 81. 2d rev. ed. Leipzig and Wien, 1894. [The origin of caste in the difference of occupation.]
(8) Iyer, L. K. Anantha Krishna. The Cochin Tribes and Castes. London, 1909.
(9) Bailey, Thomas P. Race Orthodoxy in the South. And other aspects of the Negro question. New York, 1914.
C. Classes
(1) Bücher, Carl. Industrial Evolution. Translated from the 3d German edition by S. Morley Wickett. Chap. ix, "Organization of Work and the Formation of Social Classes," pp. 315-44. New York, 1907.
(2) Hobhouse, L. T. Morals in Evolution. A study in comparative ethics. Part I, chap. vii, "Class Relations," pp. 270-317. New York, 1915.
(3) Schmoller, Gustav. Grundriss der allgemeinen Volkswirtschaftslehre. Vol. I, Book II, chap. vi, "Die gesellschaftliche Klassenbildung," pp. 391-411. 6. Aufl. Leipzig, 1901.
(4) Cooley, Charles H. Social Organization. Part IV, "Social Classes," pp. 209-309. New York, 1909.
(5) Bauer, Arthur. "Les classes sociales," Revue internationale de sociologie, XI (1903), 119-35; 243-58; 301-16; 398-413; 474-98; 576-87. [Includes discussions at successive meetings of the Société de Sociologie de Paris by G. Tarde, Ch. Limousin, H. Monin, René Worms, E. Delbet, L. Philippe, M. Coicou, H. Blondel, G. Pinet, P. Vavin, E. de Roberty, G. Lafargue, M. le Gouix, M. Kovalewsky, I. Loutschisky, E. Séménoff, Mme. de Mouromtzeff, R. de la Grasserie, E. Cheysson, D. Draghicesco.]