There is no theoretical objection whatever to the idea that new types of mind, new modes of thought, new levels of attainment, could be reached by life: the mental difference between low types of men and men of genius is almost as great as that between man and ape. The difference in practical intelligence between a hen, a dog, a chimpanzee, and a man is largely a difference in the complexity of the situations which can be grasped as a whole so that the right way out is adopted as the result of this unitary comprehension.[14] There is no reason to doubt that other types of mental mechanism are possible which would make our grasp of complex situations appear pitiful and hen-like in its limitations, which would enable their possessors to _see_ and solve in a flash where we can only grope and guess or at best calculate laboriously and step by step. But this will not take place, first until the community-environment is made as favourable as possible for such development, and secondly until there is begun a deliberate biological encouragement of new possibilities of intuition, say, or of communication between mind and mind. As regards the second point, the raising of the average as opposed to the upper level of attainment, not much need be said. That part of our civilization which can be thought of as progressive is largely concerned with this very thing--with making it possible for men to realize in larger measure their inherent possibilities. Further, in so far as there exists selection within the community, it largely, under present conditions, encourages qualities such as intelligence and initiative, which are biologically progressive. And finally, when Eugenics shall become practical politics, its action, so far as we can see, will be at first entirely devoted to this raising of the average, by altering the proportion of good and bad stock, and if possible eliminating the lowest strata, in a genetically mixed population.[15] Since, however, the main stress in human evolution has been upon the community and upon tradition, it is here that we shall expect to find most definite evidences of progress, and it is here that we do in fact find them.