Professor Allingham starts by discussing the workings of the individual mind, and tracing the development of the adult personality from its roots in infancy. He uses this background to show how the group acts as a key link between the individual and society, and the sense in which groups have lives of their own. He completes the theory by demonstrating how the unconscious aims of the members of society are translated, through the various groups to which they belong, into the institutions adopted by society. Finally, as an extension, he explores the nature of the unconscious motives which underlie our conscious social and political attitudes.