In this work, the author brings to us the best thought of the classroom and the psychological laboratory on the one hand, and the results of his years of investigation, study and practice of this study on the other hand. Dr. Morrell does not claim that this science is absolutely infallible. In judging men you are neither dealing with a machine nor with mechanical law. You are dealing with the individual and with individual variables. Contents: study of human nature; form and character; physical factors in personal psychology; signs of quality; three primary temperaments, mental, motor, vital; the face of man; national psychology, sikografs of many prominent people. Illustrated throughout.