(8) Martin, E. D. The Behavior of Crowds. New York, 1920.

(9) Christensen, A. Politics and Crowd-Morality. New York, 1915.

(10) Park, R. E. Masse und Publikum. Bern, 1904.

(11) Clark, H. "The Crowd." "University of Illinois Studies." Psychological Monograph, No. 92, XXI (1916), 26-36.

(12) Tawney, G. A. "The Nature of Crowds," Psychological Bulletin, II (1905), 329-33.

(13) Rossi, P. Le suggesteur et la foule, psychologie du meneur. Paris, 1904.

(14) ——. I suggestionatori e la folla. Torino, 1902.

(15) ——. "Dell'Attenzione collettiva e sociale," Manicomio, XXI (1905), 248 ff.

B. Political Psychology

(1) Beecher, Franklin A. "National Politics in Its Psychological Aspect," Open Court, XXXIII (1919), 653-61.