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The author is Professor of Psychology at the Yale University Institute of Human Relations. The volume is subtitled “An Introduction to Behavior Theory.” The volume “attempts to present in an objective, systematic manner the primary, or fundamental, molar principles of behavior.” Considerable technical and experimental material is examined and well worked through. The author finally isolated sixteen such principles. These cannot be given in a review, but one may be quoted to give the reader an idea. “Postulate 16—When the reaction potential to two or more incompatible reactions occur in an organism at the same time, only the reaction whose momentary effective reaction potential is greatest will be evoked.” For the convenience of the reader, mathematical data are kept separate from the discussion. The volume is by no means easy reading. The author looks forward to the time when mathematics will be able to handle these issues; he predicts a long and arduous road ahead. He says, “Behavior scientists must not only learn to read mathematics understandingly—they must learn to think in terms of equations and higher mathematics.” It is pleasant to read a volume with so much faith in science in its more precise aspects. Who is to be the Euclid of this new science only time will tell. Theorists will be interested in the volume. One can hardly imagine it having much value in the practical handling of patients today, with our relatively antique terminology and the like antiquity of the notions of our patients.