In discussing the methods of psychology Professor Münsterberg rejects the speculative and the mathematical methods; he claims a great importance (and we agree with him) for self-observation. But self-observation is no easy task; it requires a high degree of training. “He who does not understand botany cannot make observations of plant-life. The same things which call into play certain associations in the botanist are also seen by the layman, but they remain unobserved. Self-observation is in a similar way ... not without its presuppositions; it is dependent upon a rich store of ready associations” (p. 164). Psychological investigations under natural conditions are classified by Münsterberg according to their objects, as those of the normal man, the child, the savage, the insane, the animal, etc. In experimental psychology, psychopetal, psychofugal, and psychocentral processes are distinguished. For psycho-physiological investigations we have besides, (1) the immediate experiment in the laboratory, (2) the method of anatomy, (3) of comparative anatomy, (4) and of physiology. Professor Münsterberg concludes with an appeal to institute special professorships of psychology, which is at present a mere branch of philosophy. It takes all the energy of one man to keep abreast with the progress of psychological investigation. “No medical man, no lawyer, no theologian, or educator should enter into practical life without having passed an examination in psychology ... the growing generation of children, the sick, the criminal, and the comfort-seeking souls of mankind have to suffer if teachers, physicians, judges, and preachers are ignoramuses in the matter of human soul-life.... But here also the gods have placed sweat before virtue.” κρς. LA PHILOSOPHIE DU SIÈCLE. By _E. de Roberty_. Paris: Félix Alcan. The author of the present work, which forms a volume of the Library of Contemporary Philosophy, is one of those disciples of the founder of French positivism who, while following in his footsteps to a certain point, do not hesitate to diverge from the beaten track when they think their leader has gone astray in his philosophic quest. M. de Roberty speaks of Comte with reverence as his first guide and his best master, and he finds in the very contradictions of the Master the germ of his own conception of the general trend of philosophic development.