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This book is evidently written for the educated general reader, and not for the trained specialist. It begins with a sketch of the evolution of the nervous system that is remarkably well done. It is then pointed out that man was very slow in recognizing the functions of the brain, not realizing that it is the organ that makes him superior to all other animals. Walter then emphasizes the recent rapid development in the understanding of how the brain works through electroencephalography and suggests that at last we may be seeing the physical counterparts of mental events. The recently devised techniques related to electroencephalography have provided new knowledge that has practical application to epilepsy and hallucinations. He describes the possibility that the brain may work as a scanning mechanism and explains the working models that have been made by the physicists. Berger's discovery of the electroencephalograph and Pavlov's quantitative studies