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This is the second book by this author on the visceral nervous system; his earlier work was reviewed in the Archives5:3 (Jan.) 1921. The material of the present volume deals essentially with vagotonia as described by Eppinger and Hess (English translation by Walter M. Kraus and Smith Ely Jelliffe, J. Nerv. & Ment. Dis., Monograph Series, no. 20, 1915). The first chapter gives a full description of the material of those authors. The second outlines the theories of the visceral nervous system prior to the work of Eppinger and Hess. The third chapter describes the signs and symptoms of vagotonia and sympathicotonia; the fourth defines the status of these two conditions and what the author calls "neurotonia." This last represents the disorders of both systems, rather than of one predominantly, and implies that one is overactive at the same time that the other is underactive. The next six