The title alone of this little work reveals a significant phase in the history of theological science. Every friend of the psychology of religion is filled with pride and pleasure to find that Switzerland has devoted a special professorship to the subject; and that it is in charge of a man who appreciates psycho-analysis and judges it with sympathy is certainly not less important. Religious psychology in Germany, in spite of the courageous efforts of men like Vorbrodt, Runze and others, still continues in a parlous state. Surrounded on every hand by an outworn psychology which still identifies conscious with mental, and which wastes its energy in hair-splitting experiments and stereotyped arguments about matters of terminology, it never gets near enough to living religion to say very much that is essential and useful. For this reason it is just as well that, as a rule, people do not attempt to learn such a science, since it is already foredoomed to sterility.