Psychology of the Unconscious

Psychology of the Unconscious (German: Wandlungen und Symbole der Libido) is an early work of Carl Jung, first published in the Jahrbuch für Psychoanalytische und Psychopathologische Forschungen in two installments (vol. III, 1911; and vol. IV, 1912). The English translation by Beatrice M. Hinkle appeared in 1916 under the full title of Psychology of the Unconscious: a study of the transformations and symbolisms of the libido, a contribution to the history of the evolution of thought (London: Kegan Paul Trench Trubner). Hinkle's translation was reissued in 1992, as supplementary volume B to The Collected Works of C. G. Jung.

In 1952, Jung published a thoroughly revised version of the work, which was translated into English in 1956 as Symbols of Transformation, reissued as volume five of the Collected Works.

The book illustrates a theoretical divergence between Jung and Freud on the nature of the libido, and its publication led to a break in the friendship between the two men, both stating that the other was unable to admit he could possibly be wrong.