Levine's book undertakes to get at the Freudian philosophy by a consideration of the kernel of the whole Freudian system, namely, the unconscious. He devotes some paragraphs to a description of the ideas of the unconscious antedating Freud and then he sets forth Freud's own views, although almost too briefly in places to be understood perhaps, except by those who are somewhat familiar already with their general character, still in a way which is superior to any work with which the reviewer is familiar. Finally he discusses the application of these views in various