25 AUGUST 1923, Page 22

APPLIED SCIENCE.

War poetry, War fiction, War histories, in fact almost every conceivable kind of War literature, have been presented to the public en gros ; but, as far as we know, this book is the first comprehensive study of the psychological aspects of the War which has been made in English. Comprehensive is a most comprehensive term, and yet this little monograph (188 pages long) may really lay just claim to comprehensiveness. Mr. Maxwell's method is excellent. He considers the essential theories of such psychologists as McDougall, Martin Conway, Rivers and McIver and puts them to the test of War experi- ence. He shows how far these various theories seem to be substantiated by the test of war, and indicates to what extent, in his opinion, the lessons of war demand their modification or rejection. He supplements his own considerable War experience and observations by occasional judicious reference to the writings of such men as Donald Hankey, Stephen

Graham and Patrick McGill. In short, the book is sound and scientific and deserves wide recognition and a large circulation. Theories and Problems of Cancer. By Charles Edward