The group mind : a sketch of the principles of collective psychology, with some attempt to apply them to the interpretation of national life and character / William McDougall. McDougall, William. 1871-1938. Ethnopsychology. Social psychology. National characteristics. 150 MCG A sequel to the author's "Introduction to social psychology." cf. Pref. Cambridge : The University Press, 1920. 1920. 1920 Text xvi, 304 p. ; eng The Cambridge psychological library