A collection of essays on psychology. Contents Include: Part One – 1931-1933: War, Sadism and Pacifism; A Postscript on Masochism; The Problem of Prevention; An Outline of Research; Part Two – 1938-1940: Preamble to War; The Return of War-Neuroses; Part Three – 1941-1944: Pacifism in Eclipse; The Instruments of Investigation; The Second World War; Views and Reviews; The Principles and Practice of War-prevention; The Angle of Approach; Part Four – 1945: Preparations for the Next War?; Homo Sapiens. This book contains classic material dating back to the 1900s and before. The content has been carefully selected for its interest and relevance to a modern audience.