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If the readers of this volume were asked to name its distinctive characteristic it is believed that a large number would reply, “Its manifest and at times exalted spiritual note.” In it an encouraging optimism as to the possibilities of development of human personality is also disclosed. The book should both stimulate and satisfy the intellectual thirst of all those whose tastes for the wine of psychology are not conditioned by a rigid organicism or by a fanatical Freudianism. The fine diffusive quality of mysticism that so frequently permeates Jung's writings but adds bouquet.
The work consists of a collection of papers and addresses that further develop the author's most important theories and apply them to many modern problems. The longest and in many ways the most important paper is the first one, entitled, “On Psychical Energy,” in which he adopts an energic rather than a mechanistic view. Jung agrees with von Grot whom he quotes: “The idea of psychic energy is as much justified in science as it that of physical energy, and psychic energy equally with physical energy has quantitative measurements and a variety of forms.” This quantitative measurement of psychic energy is both by subjective and objective methods. Subjective measurements are naturally limited to the