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This little book most assuredly lives up to its subtitle: An Essay on Evolutive Biopsychology. In this sense it gives really eloquent testimony of the author's brilliancy in the best tradition of the French school. At times, of course, its highly spirited style makes it somewhat difficult to read; the "élan psychogénètique," to which the third chapter is devoted, has carried the author to heights almost too elevated to follow. But that is perhaps the advantage of the book; it startles the reader, stimulates reactions of various kinds and is never tiresome. Some of the conceptions are astonishingly keen and daring, whereas others date back to our forefathers. The whole work is inspired by a life-asserting optimism and a positive philosophy.
The book is difficult to summarize, but its principal thoughts may be formulated as follows: Radiant and convergent energy are the two fundamental tendencies of both the inorganic and
Introduction a l'étude de la psychogénèse. Arch NeurPsych. 1927;18(6):1060–1061. doi:10.1001/archneurpsyc.1927.02210060195011
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