ABSTRACT
This chapter suggests that a recognition of just two physical types is necessary in the formulation and development of the problem of variability in personality and form among normal human individuals. Neither the upper, middle nor lower class of human society has sifted out any one definite human type. The structural changes occurring at the sex-decline or menopause in women are similar in character but more pronounced and rapid in their development than the above changes in men, probably because the physiological castration in women is much more complete than in the male. The small mammals, squirrels and others, as well as large mammals, also show numerous geographic varieties. It is a well-recognized fact that when the distribution of an animal species becomes very extensive the species is frequently broken up into a number of varieties, each typical for a given geographic region.
