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t IISTE, Les Principes d'mie Socioloyic Objective. 103 1'hypnotiseur, besoin de direction chez les douteurs, la maladie de 1'isolement, influence d'une affirmation d'eirangere indicate the topics treated. I have loft myself little space to deal with volume ii., which is a conjoint production of Dr. Janet and Prof. Bayrnond. The principle difference between the two volumes is that the first is given up more to expositions of general principles, the second is given up more to description of cases as illustrations of those principles. The volume covers a very extended area of mental diseases : mental confusion primitive, secondary and periodic ; the abonliaa also primitive, secondary and periodic ; the deliriums of -the Ciensesthesis loss of the feeling of personality ; the emotional deliriums systematised, permanent and generalised ; obsessions and impulsiveness- hysterical and other; varieties of sleep ; the somnambulisms, fugues; diseases of sensibility anaesthesias, dysaesthesias simple and complicated ; tremors and choreas ; tics hysterical and psychas- thenic ; paralyses systematic, localised and hysterical ; con- tractures ; affections of language ; visceral spasms ; vaso-motor and trophic affections. Some notion of the amount of labour involved in these " lemons cliniques du mardi," may be gathered from the fact that 152 cases are minutely analysed and discussed. And, like the first volume, this is admirably clear and precise in writing and in arrangement. Probably the most striking discussions are on the somnambulisms and fugues (chap, vii.), where the whole process of the subconscious apperception of fixed ideas is dissected and laid bare. By whatever name we shall ultimately agree to call this kingdom of the subconscious, its existence and organisation are henceforward facts to be explained, not hypotheses to be speculated upon. The whole range of problems dealt with by the Societies for Psychical Research are dealt with here by a method that justifies itself at every hand, and if I have said so little in criticism of details and many points offer it is because I have been so profoundly impressed not only with the large mass of material, but also with the persistent scientific industry and competence of the observers. In fulfilling the canons of the great Charcot-tradition, they have set a pattern to the world. Of the facts in Dr. Janet's former work, Prof. W. James said: "All these facts, taken together, form unquestionably the beginning of an inquiry which is destined to throw a new light into the very abysses of our nature " (Prin. of Psych., L, 211). It is not too much to say that this great work of Dr. Janet and Prof. Raymond is a fitting sequel to that brilliant beginning. w _ LESLIE MACKENZIE. Les Principes d'une Sociologie Objective. Par ADOLPHE COSTE, Ancien president de la Societe de Statistique de Paris. Paris : F. Alcan, 1899. Pp. iv., 243. THE avowed object of this essay is "to react against the rising flood of psychology which threatens to invade sociology and to