ABSTRACT
This chapter examines certain phases of activity which are capable of individual statement. It shows how a people may grow immune to such diseases as consumption, and how the capacity to endure city life may be acquired by a race. By all means the most important phase, however, of the physical endowment of the individual has to do with the nervous system. The social activities are mediated by nervous process, of course, but one cannot even by the aid of a most desperate prejudice succeed in correlating the degree of social organization with the degree of nervous differentiation. It must be remembered that animals even without any nervous differentiation at all show all the typical reactions of animals with nervous systems, as is proved by Jennings in his work on the Behavior of the Lower Organisms. Race type as we commonly meet it is a very different thing. It is stated almost exclusively in psychical terms.
