The study of human stature involves several questions of more important interest than that of mere theory or curiosity. It may aid us in learning whether the human race is really degenerating, as some persons assert, by determining whether our ancestors in heroic and prehistoric times had the superior physical prowess that is often ascribed to them. It should teach us whether there are races of dwarfs and of giants, and what are the distances separating the races that most nearly approach those descriptions. We learn from it the exact facts respecting the differences in stature among the people of a single nation, our own, for instance, to which military men attach high value. Other fields of inquiry, of a practical bearing, regard the causes that influence the stature of populations and races in general, and the growth of individuals, from infancy up; and the influence of stature upon the force, agility, endurance, and physical development of individuals. An opinion was current, in the last century, that our ancestors, at some time in the past, were the equals or superiors in size to the largest men now to be found.