A good heredity is something very different from hereditary goodness, in the sense of good conduct. The latter does not exist, while the former is simply an inheritance of lines of capacity corresponding to the chief lines of human function; a good raw material for social influence to work up, just as sound timber is good for houses, ships, or what-not. And this sort of heredity is a condition of biological survival because it alone makes possible the education of individuals and their organization into those plastic social wholes, with innumerable special functions, upon which the life and power of man is based. Along with this plastic heredity and inseparable from it we have the social process, which does not antagonize the biological process, or supplant it, but utilizes the change in its character to add a new world of psychical interaction and growth. Like the older process it is continuous through the ages, and builds up vast organic wholes, of which the individual may seem only an insignificant detail. As we have biological types, on the one hand, so, on the other, we now have types of culture and institutions. Thus the life of humanity comes to be a single vital process having two parallel and interdependent subprocesses, the hereditary and the social. Each of these has a sphere of its own, that of heredity being, in general, the production of physical and mental aptitude, and that of society the creation, by the aid of this aptitude, of a progressing social order. Each system acts selectively upon the other, determining what will work and what will not. Hereditary types must in some way fit into the social conditions or they cannot propagate themselves and must disappear. If a man cannot, by hook or crook, manage to raise a family, that part of the hereditary stream which flows in him is lost, and the type he represents declines. In like manner, if a race, or a national stock, does not succeed in developing such forms of personality and social organization as to enable it to keep a footing and multiply its kind in the actual conditions of life, it must diminish. The social organization sets standards of fitness which the biological process must meet. It is equally true, on the other hand, that the biological type acts selectively in determining what social ideas and institutions will work, and how. You may give the same lecture to a hundred students, but what each one makes of it will depend, in part, on his natural gifts. Or you may plant the same ideas of free government among the Americans, the Swiss, the French, the people of the Argentine, and the Liberian Negroes; but their growth will be very different, partly, again, because of a difference in hereditary capacity.