As social evolution proceeded and brought about more extensive and more complex forms of social organisation, which included, within any one society or group, larger numbers of individuals in more effective forms of association, social organisation must have assumed a constantly increasing importance as a condition of mental evolution relatively to all other factors, especially as compared with the influence of physical environment; until, in the complex societies of the present time, it has an altogether predominant importance. This truth is concisely stated in the old dictum that “in the infancy of nations men shape the State; in their maturity the State shapes the men.” Accordingly, in considering the mental evolution of peoples we must never lose sight of the influence of social organisation. It follows that the conditions of the mental evolution of man are immensely more complex than those of the mental evolution of animals.
We must recognise not only the selection, through survival in the struggle for existence, of new mental qualities arising as spontaneous variations of individual mental structure. This, which is the only, or almost the only, process at work in the mental evolution of animals, is immensely complicated and overshadowed in importance by two processes. The first is the accumulation of knowledge and morality in traditional forms. The traditional accumulation, which so far outweighs the mental equipment possible to any individual isolated from an old society, not only constitutes in itself a most important evolutionary product, but it modifies profoundly the conditions of evolution of the individual innate qualities of mind; for example, the greater and more valuable the stock of traditional knowledge and morality becomes, the more does fitness to survive consist in the capacity to assimilate this knowledge and to conform to these higher moral precepts, the less does it consist in the purely individualistic qualities, such as quickness of eye and ear, fleetness of foot, or strength and skill of hand. Secondly, the processes of natural selection are complicated by the social evolution, which tends progressively to abolish the struggle for existence between individuals, and to replace it by a struggle between groups; in which struggle success is determined not only by the qualities of individuals, but also very largely by the social organisation and by the traditional knowledge and morality of the groups.
Each variety of the human species, each race considered as a succession of individuals having certain innate mental qualities, has been evolved, then, not merely under the influence of the physical environment, like the animal species, but also and to an ever increasing extent under the influence of the social environment. The social environment we regard as consisting of two parts; namely, the social organisation and the body of social tradition; for these, though interdependent and constantly interacting, may yet with advantage be kept apart in thought. We must, then, bear constantly in mind the fact that man creates for himself an environment which becomes ever more complex and influential, overshadowing more and more in importance the physical environment.
Here I would revert to some points of the analogy, drawn in Chapter X, between the mind of a nation and that of an individual. The mind of an individual human being develops by accumulating the results of his experience; and so does that of a people. In this respect the analogy holds good. But the development possible to an individual is strictly limited in two ways. First, by the short duration of the material basis of his mental life; secondly by the extent of his innate capacities. Neither of these limitations applies to the national mind. Its material basis is in principle immortal, because its individual components may be incessantly renewed; and its development has no limit set to it by its innate capacities, because these may be indefinitely extended and improved. In these respects the national mind resembles the species rather than the individual.
The development of the national mind, and of the minds of those who share in the mental life of the nation, thus combines the methods and advantages of the development of individuals and of species, methods which are essentially different. The result is that the mental development of man, since his social life began, has been radically different from that of the animals; it has been a social process; it has been the evolution of peoples rather than of individuals. The evolution of man as an individual has been wholly subordinated to that of peoples; and it is incapable of being understood or profitably considered apart from the development of the group mind.
Assuming, as we must, that all the races of men are derived from a common stock, it is obvious, I think, that the first differentiation of racial types was determined almost exclusively by differences of physical environment, and that the other conditions only very slowly developed and did not assume their predominant importance until the time which may be roughly defined as the beginning of the historic or nation-making period.
Physical environment affects the mental qualities of a people in three ways: firstly, it directly influences the minds of each generation; secondly, it moulds the mental constitution by natural selection, adapting the race to itself; thirdly, it exerts indirect influence by determining the occupations and modes of life and, through these, the social organisation of a people. We may consider these three modes of influence in turn.
There has been much speculation on the direct influence of the physical environment in moulding the mental type of a people, but little or nothing can be said to be established.
There is a fair concensus of opinion to the effect that what we may call climate exerts an important influence. In climate the two factors recognised as of chief importance are temperature and moisture. High temperature combined with moisture certainly tends to depress the vital activity of Europeans and to render them indolent, indisposed to exertion of any kind. On the other hand, high temperature combined with dryness of the atmosphere seems to have the effect of rendering men but little disposed to continuous activity, and yet capable of great efforts; it tends to produce a violent spasmodic activity. A cold climate seems to dispose towards sustained activity and, when combined with much moisture, to a certain slowness.