Freud's most influential discovery was the importance of what he called psychic reality in the functioning of the mind. Melanie Klein has mined thoroughly the vein of mental life that he discovered, and the results of her work have had an impact on psychoanalytic thinking throughout the world. In this text, Dr Caper shows how Melanie Klein's studies of sexuality, aggression, unconscious phantasy and identification in children, both extended and corrected Freud's theories of the early development of the superego and the early stages of the Oedipus complex in both boys and girls. Klein's development of Freud's work has allowed psychoanalysts not only to achieve deeper and more stable therapeutic results with neurotic patients, but also to begin to extend the therapeutic scope of psychoanalysis into the area of more severe emotional disturbances. "Immaterial Facts" should prove useful reading to both to professionals and students interested in the treatment of emotional disturbances and the functioning of the mind.