Taschenbuch. Zustand: Neu. Neuware - In this book I have sketched the principles of the mental life of groups and have made a rough attempt to apply these principles to the understanding of the life of nations. I have had the substance of the book in the form of lecture notes for some years, but have long hesitated to publish it. I have been held back, partly by my sense of the magnitude and difficulty of the subject and the inadequacy of my own preparation for dealing with it, partly because I wished to build upon a firm foundation of generally accepted principles of human nature.