The following papers have been gathered together from various sources, and are now available for the first time to English readers. The subject of psychoanalysis is much in evidence, and is likely to occupy still more attention in the near future, as the psychological content of the psychoses and neuroses is more generally appreciated and understood. It is of importance, therefore, that the fundamental writings of both the Viennese and Zürich Schools should be accessible for study. Several of Freud's works have already been translated into English. Dr. Jung's "Wandlungen und Symbole der Libido" was published in America in 1916 under the title of "The Psychology of the Unconscious." That work, read in conjunction with these papers, offers a fairly complete picture of the scientific and philosophic standpoint of the leader of the Zürich School. It is the task of the future to judge and expand the findings of both schools, and to work at the development of the new psychology, which is still in its infancy.