When asked why some men with moderate talents and meagre technical equipment succeed, where others with greater ability and better preparation fail; why some women with plain features and few accomplishments charm, while others with all the advantages of beauty and cultivation repel, we are wont to conceal our ignorance behind the vague term personality. Undoubtedly the deeper springs of personality are below the threshold of consciousness, in hereditary traits and early training. Still some of the higher elements of personality rise above this threshold, are reducible to philosophical principles, and amenable to rational control.