It would involve much dry, technical writing to explain in detail the scientific reasons why the extreme convex in profile indicates extreme energy, quickness, impatience, impulsiveness, keenness and alertness of intellect, and great rapidity in action. The large nose, high in the bridge, however, indicating, as you have already seen, great energy, is one of the scientific reasons for this. In a similar way it would take me too long to tell in detail why the extreme concave of profile indicates just the opposite qualities. It is a scientific fact that that which is sharp is penetrating and moves quickly; that which is blunt is non-penetrating and of necessity moves slowly. The needle darts through the cloth more quickly than the bodkin. The greyhound is swifter than the bulldog. The stiletto does quicker work than the bludgeon. This, of course, is only a symbolism which may make vivid the truth that the convex man works more rapidly than the concave. In commercial work, the man who is successful in positions requiring quick decision and quick action has a convex profile, while the man whose duties call for patience, deliberation, reflection, and the ability to plod should have some modification of the concave form of profile. SIZE It is an old saying that large bodies move slowly. It would be more scientifically correct to say that large bodies get under way slowly. Difference in physical size between men is important in many ways. If, as William James says, "the causes of emotion are indubitably physiological," then the smaller the physical bulk which must be affected in order to have an intense emotion, the more quickly and easily is that intense emotion aroused. Other things being equal, the small man is more excitable and becomes angry more easily than the large man. He also cools down more quickly. When the huge bulk of the big man becomes thoroughly aroused, thoroughly wrought up, it is time to get out of the way and stand from under. STRUCTURE Hall Caine, the novelist, has an immense head, a slender jaw, and a small, fragile body. James J. Jeffries, the pugilist, has a comparatively small head, a large jaw, and huge bones and muscles. Ex-President Taft has a comparatively small head, round face, round body, round arms and legs. These are differences in structure.