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This monograph begins with a review of different theories of suggestion, which are divided into five groups. Among them, Freud's is mentioned with measured approval. The author next analyzes the process of waking suggestion among a group of normal children who are led to believe by their teacher that they smell a perfume. This, the author argues, is dependent on four groups of factors: the readiness of the disposition to smell; the sensitiveness of the subject to the stimuli of the situation, willingness, habituation and instinctive impulse; the stability of belief produced by the stimulating and inhibiting influence of experience and also instinctive factors, and crowd psychology in itself conditioned by habit and instinctive factors similar to those already mentioned. The author also analyzes an instance of therapeutic suggestion and believes that this is dependent on five factors: the inhibitory effect which the unpleasant sensations of the disease and the