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This volume by the man whose name has for years been identified with work on conditioned reflexes is especially welcome as it is a natural sequel to his first attempt at a general exposition of the subject. I am referring to the volume entitled "Twenty Years Experience of Objective Study of the Highest Nervous Activity of Animals" (reviewed in the Arch. Neurol. & Psychiat. 17:135 [Jan.] 1927). In that volume, which unfortunately has not been translated into English yet, the author gave an intimate view of the development of his work. The present volume which consists of a series of lectures given before the Military Medical Academy in Leningrad in the spring of 1924 represents the mature consideration of all the data obtained by the author himself as well as his co-workers up to that time. This volume, as the first one, is remarkable for the absence of any