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 PHILOSOPHICAL PERIODICALS. 135 book should be valuable. Ot'ncral result: all mental healing is by way of suggestion. " The idea of health tends to produce health in proportion to the strength of the idea, or inversely as the opposition to be met." Theory of the physiology of suggestion, in terms of the brain-paths vacated in the degeneration of voluntary to reflex movement.] EL S. Jennings. ' The Psychology of a Protozoan.' [Resume, from the side of psychology, of the author's recent studies of paramecium. " The re- actions are comparable in all essentials to those of an isolated muscle. . . . We are not compelled to assume consciousness or intelligence in any form to explain these activities." A good paper.] Q. 8. Hall. ' A Study of Anger.' [Exhaustive analysis of anger, based on questionnaire re- turns. Causes : spontaneous anger, personal antipathies, dress and ornament, habits, invasion of the self, injustice, etc. Subjective varia- tions: heredity, teasing, absence of temper. Physical manifestations: secretions, vasomotor disturbances, etc. Anger at inanimate objects; vents. Reaction after anger. Control. Treatment. Critique of James- Lange theory ; " the feelings are indefinitely older than the will, as it is older than the intellect ".] Psychological Literature. Books received. THE AMERICAN JOURNAL OF SOCIOLOGY. Edited by ALBION W. SMALL. Vol. iv. Chicago : The University of Chicago Press, 1899. The editor of The American Journal of Sociology is to be congratulated on the com- pletion of the fourth volume of this important publication. The present volume contains a variety of articles on sociological questions and socio- logical method in addition to many valuable reviews of books. The editor, Mr. Small, contributes three papers on the " Methodology of the Social Problem " ; Mr. Mark Baldwin has an article on the social and the extra-social ; Prof. Simmel, three papers on the persistence of social groups ; Prof. Ratzcl, a similar number of papers on political areas. Mr. C. H. Henderson's reviews of sociological books are well and carefully done. A useful feature of the journal is the bibliography. A very full and carefully classified list of new works of a sociological character appears in each number, and Mr. C. H. Hastings deserves much credit for the excellent manner in which this portion of the magazine is conducted. ARCHIVES OF NEUROLOGY AND PSYCHOPATHOLOGY. Vol. i., Nos. 1 and 2. I. van Gieson and B. Sidis. ' Neuron Energy and its Psychomotor Manifestations.' [Attempts, in diagrammatic form, to correlate the general manifestations of psychomotor life with more or less definite physiological processes depending on the expenditure or restitution of neuron energy.] X. van Gieson. 'The Correlation of Sciences in the Investigation of Nervous and Mental Diseases.' [(1) History of psychi- atry : periods of revenge ; of indifference ; of humanitarian and empirical treatment ; of scientific study, rational treatment, and preventive medicine. Psychiatric methods : the relation of the asylum and of the psychopathic hospital to science (2) The place of psychology, histol- ogy, neurology, cellular biology, bacteriology, pathological anatomy and physiology, anthropology, in the investigation of mental diseases. A paper of 200 pp., popularly written ; without index or table of contents. Normal psychology is handled somewhat contemptuously : it is abnormal psychology that ' has furnished the key to the understanding and even the treatment of functional nervous and mental diseases." Histologically, the " neuron theory, Sidis' psychophysiological theory of association and dissociation, the theory of the expansion and contraction of the neurons, the theory of neuron energy fluctuation, and Flechsig's plan of the association centres and sensory spheres of the brain " are of prime psychiatrical importance.]