[136] Thurnwald, l. c., p. 773.
[137] Thurnwald, l. c., p. 699.
[138] Thurnwald, l. c., p. 709.
[139] Thurnwald, l. c., p. 711.
[140] Cf. with this F. Oppenheimer’s Grossgrundeigentum etc., Book II, Chap. 3.
[141] “Tendency, i. e., a law, whose absolute execution is checked by countervailing circumstances, or is by them retarded, or weakened.” Marx, Kapital, vol. III, p. 215.
[142] Cf. the excellent work of Peter Kropotkin, Mutual Aid in its Development.
[143] Cf. F. Oppenheimer, Die Siedlungsgenossenschaft etc., Berlin, 1896, and his Grossgrundeigentum und soziale Frage, Berlin, 1898.
[144] Cf. F. Oppenheimer, Bevölkerungsgesetz des T. R. Malthus. Darstellung and Kritik, Berlin-Bern, 1901.
[145] Cf. F. Oppenheimer, Grundgesetz der Marxschen Gesellschaftslehre, Darstellung und Kritik, Berlin, 1903.