And what it means is that Nature is partial to individuals _in making them_, in their natural heredity, rather than after they are born.
The principle of heredity with variations is a safe assumption to make also in regard to mankind; and we see at once that in order to come in for a part in the social heritage of our fathers we must be born fit for it.

We must be born so endowed for the race of social life that we assimilate, from our birth up, the spirit of the society into which we are reared.

The unfittest, socially, are suppressed.

In this there is a distinction between this sphere of survival and that of the animal world.

In it the fittest survive, the others are lost; but in society the unfittest are lost, all the others survive.