Passing from point of view and purpose to content we do not look for and do not find any 'closed system,' but "a mass of descriptive details" in the selection of which personal interest has been the controlling factor. The articles which Professor James has written from time to time in the periodicals appear, sometimes a little remodelled, in the larger work; each chapter is thus largely an independent essay upon the topic printed at the head of it. On the physiological side we have an admirable chapter on the functions of the brain, but elsewhere the student is referred to other works for the physiological points involved. Following this is an excellent essay on Habit and Automatism, whereupon without further ceremony the reader is invited to a somewhat speculative series of chapters upon 'Mind Stuff,' 'Knowledge and Reality,' and the like, and may resume the more concrete chapters on Attention, Conception, Discrimination and Comparison, Association, only after struggling with the complex picture of 'the Stream of Thought,' 'the Consciousness of Self,' and 'the Snares of Psychology.' Each of these chapters presents a distinct problem, presents it well and positively, and contributes much that is original to the discussion. In all this there is strongly emphasised the subjective contribution to Psychology,—the value of a discerning and critical introspection and the importance of the subject in all processes of sense, judgment, attention, association, and the like. The mind is not a passive receptacle of experiences, but is continually active, making and shaping, seizing and transforming, absorbing and assimilating the stimuli of its environment. A second series of topics take up the perception of those general concepts, Time, 'Things,' Space, Reality, and Form, the largest and heaviest chapters in the work, amongst which, as if to whet the appetite, are distributed more concrete pages dealing with Memory, Sensation, and Imagination. The former devote much space to criticism, and would, perhaps, border upon the metaphysics that was to have been avoided, were it not that they spring from considerations much more concrete and provable; the latter group of chapters are amongst the most interesting of the volume, and though treating but a small and somewhat arbitrarily selected portion of each of the topics, treat them in a suggestive and inspiring way. Discerning and ingenious sketches of single mental traits and processes, happy illustrations, suggestive side issues make these pages a striking contrast to the usual text-book tone, and will attract students of all shades and grades of agreement or disagreement with the author's views.