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This small volume, as indicated by the subtitle, deals with the mechanisms of neuron activity as applied to the study of human behavior. It is admirably written and makes excellent use of the work of Parker, Herrick and Sherrington. As a mechanistic foundation for the study of mental activities it contains much of value, even though the title is in some respects misleading. The author is deeply impressed with the conception that "mental phenomena are in their essence physical," and he carefully omits consideration of the dynamic factors which differentiate living from nonliving matter. Much is said of the influence of external "impacts" and their mode of transmission from receptor to effector, but the forces inherent in life, which surely are important determinants in the selection of reactions to these impacts and thus to self and race preservation, are almost entirely ignored. That such forces, primarily unconscious, may be the