If we take now the teachings which can be borrowed from the analysis of modern society, in connection with the body of evidence relative to the importance of mutual aid in the evolution of the animal world and of mankind, we may sum up our inquiry as follows.

In the animal world we have seen that the vast majority of species live in societies, and that they find in association the best arms for the struggle for life: understood, of course, in its wide Darwinian sense — not as a struggle for the sheer means of existence, but as a struggle against all natural conditions unfavourable to the species. The animal species, in which individual struggle has been reduced to its narrowest limits, and the practice of mutual aid has attained the greatest development, are invariably the most numerous, the most prosperous, and the most open to further progress. The mutual protection which is obtained in this case, the possibility of attaining old age and of accumulating experience, the higher intellectual development, and the further growth of sociable habits, secure the maintenance of the species, its extension, and its further progressive evolution. The unsociable species, on the contrary, are doomed to decay.

Going next over to man, we found him living in clans and tribes at the very dawn of the stone age; we saw a wide series of social institutions developed already in the lower savage stage, in the clan and the tribe; and we found that the earliest tribal customs and habits gave to mankind the embryo of all the institutions which made later on the leading aspects of further progress. Out of the savage tribe grew up the barbarian village community; and a new, still wider, circle of social customs, habits, and institutions, numbers of which are still alive among ourselves, was developed under the principles of common possession of a given territory and common defence of it, under the jurisdiction of the village folkmote, and in the federation of villages belonging, or supposed to belong, to one stem. And when new requirements induced men to make a new start, they made it in the city, which represented a double network of territorial units (village communities), connected with guilds these latter arising out of the common prosecution of a given art or craft, or for mutual support and defence.

And finally, in the last two chapters facts were produced to show that although the growth of the State on the pattern of Imperial Rome had put a violent end to all medieval institutions for mutual support, this new aspect of civilization could not last. The State, based upon loose aggregations of individuals and undertaking to be their only bond of union, did not answer its purpose. The mutual-aid tendency finally broke down its iron rules; it reappeared and reasserted itself in an infinity of associations which now tend to embrace all aspects of life and to take possession of all that is required by man for life and for reproducing the waste occasioned by life.

It will probably be remarked that mutual aid, even though it may represent one of the factors of evolution, covers nevertheless one aspect only of human relations; that by the side of this current, powerful though it may be, there is, and always has been, the other current — the self-assertion of the individual, not only in its efforts to attain personal or caste superiority, economical, political, and spiritual, but also in its much more important although less evident function of breaking through the bonds, always prone to become crystallized, which the tribe, the village community, the city, and the State impose upon the individual. In other words, there is the self-assertion of the individual taken as a progressive element.

It is evident that no review of evolution can be complete, unless these two dominant currents are analyzed. However, the self-assertion of the individual or of groups of individuals, their struggles for superiority, and the conflicts which resulted therefrom, have already been analyzed, described, and glorified from time immemorial. In fact, up to the present time, this current alone has received attention from the epical poet, the annalist, the historian, and the sociologist. History, such as it has hitherto been written, is almost entirely a description of the ways and means by which theocracy, military power, autocracy, and, later on, the richer classes’ rule have been promoted, established, and maintained. The struggles between these forces make, in fact, the substance of history. We may thus take the knowledge of the individual factor in human history as granted — even though there is full room for a new study of the subject on the lines just alluded to; while, on the other side, the mutual-aid factor has been hitherto totally lost sight of; it was simply denied, or even scoffed at, by the writers of the present and past generation. It was therefore necessary to show, first of all, the immense part which this factor plays in the evolution of both the animal world and human societies. Only after this has been fully recognized will it be possible to proceed to a comparison between the two factors.

To make even a rough estimate of their relative importance by any method more or less statistical, is evidently impossible. One single war — we all know — may be productive of more evil, immediate and subsequent, than hundreds of years of the unchecked action of the mutual-aid principle may be productive of good. But when we see that in the animal world, progressive development and mutual aid go hand in hand, while the inner struggle within the species is concomitant with retrogressive development; when we notice that with man, even success in struggle and war is proportionate to the development of mutual aid in each of the two conflicting nations, cities, parties, or tribes, and that in the process of evolution war itself (so far as it can go this way) has been made subservient to the ends of progress in mutual aid within the nation, the city or the clan — we already obtain a perception of the dominating influence of the mutual-aid factor as an element of progress. But we see also that the practice of mutual aid and its successive developments have created the very conditions of society life in which man was enabled to develop his arts, knowledge, and intelligence; and that t............