Bollingen Series XXBibliography & index.This volume has become known as perhaps the best introduction to Jung's work. In these famous essays. "The Relations between the Ego & the Unconscious" & "On the Psychology of the Unconscious," he presented the essential core of his system. Historically, they mark the end of Jung's intimate association with Freud & sum up his attempt to integrate the psychological schools of Freud & Adler into a comprehensive framework. The earliest versions of the Two Essays, "New Paths in Psychology" (1912) & "The Structure of the Unconscious" (1916), discovered among his posthumous papers, are published in an appendix, to show the development of his thought in later versions. As an aid to study, the index has been comprehensively expanded.