The word ‘Psychology’ has become a capacious umbrella which covers a baffling variety of literature. ‘Contributions to Psychology’ covers, a still wider, indeed an almost limitless, range. Nihil humanum a me alienum: there can be no pre-established boundaries to a study or practice, which is concerned with the sources, motives and patterns of the totality of human experience and behaviour. A biography, a novel, a drama, even a painting or a quartet, often reveals depths of the human psyche unattained by works on medical or academic psychology. But these also have immeasurably widened their scope in recent decades. The hypothesis of primitive unconscious layers (whether or not accounted for in terms of a ‘collective unconscious’), which find expression in myths, ritual, and social patterns, has made ethnology, mythology, folk-lore, comparative religion, history, pre-history and countless other fields of research, all tributary in various ways to psychology, while psychology in its turn has given to them a new stimulus and orientation. The breakdown of the post-Cartesian dichotomy of mind and matter, with its restriction of psychology to the former, has also added increasingly to the psychologists’ concern with the biological and physical sciences, while the treatment of psychological phenomena in dynamic rather than purely mechanistic terms has opened new horizons to the theoretical psychologist which are as yet too indistinct to be accurately defined.