A Primer of Jungian PsychologyBy: Calvin S. Hall, Vernon J. Nordby The contributions of Carl Jung to understanding of the human psyche are immense. Starting as Freud's most famous disciple, Jung soon broke away from his mentor to follow his own lines of investigation and discovery. Many of Jung's ideas are now considered fundamentals in the study of the mind, but other, more controversial theories dealing with the psychological relevance of alchemy, ESP, astrology, and occultism