The First International Congress for Analytical Psychology was held in Zürich in 1958. The opportunity provided for analysts to meet and to exchange views revealed differences in theory, approach, and emphasis which were mostly welcomed as evidence of the vitality in a developing analytical psychology.

Thanks to G. Adler's efforts, nineteen essays have been published in volume form. Though very varied in subject matter and treatment, all elaborate or develop Jung's researches. They defy adequate review within the space available and many stimulating papers can be barely mentioned. Those selected for consideration are chosen to illustrate two main themes. The first theme takes up the relationship between concepts of the ego and the self. It is developed in different ways by Neumann, Adler, Baudouin, Harding, Layard, and Hobson.