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The subtitle of this book, A Study of Anxiety, Sex, Gravitation and Learning, describes the area in which the author searches for the elements which later determine mature bodily behavior. His interesting viewpoints are presented in a very condensed way, partly in a popularized form, partly on a scientific level. He familiarizes the reader with the pertinent facts about the activity of the nervous system, which, as he emphasizes, participates in every mental act by sending out impulses—sensory, motor, vegetative—always in an integrated way and is involved even in the most abstract thoughts. 'Abstract thinking is possibly only a conjunction with a special configuration or pattern or state of the body.' But it is the bodily behavior of an individual which expresses the achievement of the proper adjustment to those impulses by continually learning new responses to stimuli. Posture and muscular behavior come under the heading of learning and are acquired responses fitting the environment. 'Posture is one of the best clues not only to evolution but also to the activity of the brain', because all perception and sensation take place on a background of muscular activity, and every impression due to a sensory impulse is at least mixed with