«How to Analyze People on Sight» by Elsie Lincoln Benedict, Ralph Paine Benedict

In this popular American book, accomplished public speaker and self-help charlatan Elsie Lincoln Benedict outlines her pseudo-scientific system of "Human Analysis". She proposes that, within the human race, five sub-types have developed through evolutionary processes, each with its own distinct character traits and corresponding outward appearance. She offers to teach the reader how to recognise these five types of people and understand their innate differences.