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(1930) Preliminary Experiments on the Causal Factors in Animal Learning. By J. A. Gengerelli: (Thesis for Degree of Ph.D. in the University of Pennsylvania). Pp. 54. Philadelphia. 1929. A Comparative Study of Audito-Vocal Digit Spans. By Mary H. Young: (Thesis for Degree of Ph.D. in the Uniersity of Pennsylvania). Pp. 14. Philadelphia. 1928. An Analytic Study of one Class in High School. By Anna E. Biddle: (Thesis for Degree of Ph.D. in the University of Pennsylvania). Pp. 22. Philadelphia. 1928.. Psychoanalytic Review 17:386