In this book, Paul Ekman and a cast of other notable scholars and scientists reconsider central concepts and key sources of information in Darwin's work on emotional expression. It was first published in 1972 to celebrate the centennial of the publication of Darwin's book The Expression of the Emotions in Man and Animals, and it is the first of three works edited by Dr. Ekman and others on the subject. This Malor edition has new and updated references.