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(7) Ellwood, Charles A. "A Psychological Theory of Revolutions," American Journal of Sociology, XI (1905-6), 49-59.

(8) ——. Introduction to Social Psychology. Chap. viii, "Social Change under Abnormal Conditions," pp. 170-87. New York, 1917.

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(10) Toynbee, Arnold. Lectures on the Industrial Revolution of the Eighteenth Century in England. New ed. London, 1908.

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(12) Taine, H. A. The French Revolution. Translated from the French by John Durand. 3 vols. New York, 1878-85.

(13) Olgin, Moissaye J. The Soul of the Russian Revolution. Introduction by Vladimir G. Simkhovitch. New York, 1917.

(14) Spargo, John. The Psychology of Bolshevism. New York, 1919.