The two early writings "On the Psychology of the Unconscious" and "The Relations between the Ego and the Unconscious," included in this volume, are among the most important and foundational works of C. G. Jung. Drawing on a wealth of experiential material, he outlines the fundamental concepts of Analytical Psychology. In a vivid and engaging manner, the author discusses the relationship of ego consciousness to the unconscious processes in the human soul and the influences of the unconscious on our personal lives. Both works have undergone numerous new editions over the years, and, unlike many of C. G. Jung's other writings, they have been subjected to an ongoing process of revision and creative development. For the sake of completeness and to allow the reader to follow this developmental process.