exists. They are the pathological experiences which reveal the strength and the weaknesses of the normal functions. We strive and hope for a more lasting state of general health, and do not despair of the patient even in this grave attack. He has survived even more serious illness. For though the present war is the most gigantic that the world has ever seen, its very greatness is the result of some of those modern developments—scientific skill, improved communications, national cohesion—on which ultimately the better organization of the whole commonwealth of nations will be built. Passi graviora; we have weathered the storms of the sixteenth and seventeenth centuries, when the old Roman order and its sequel in the Catholic Church were at their weakest and the recuperative power of science and social reform and nationalism had hardly begun its work. We shall not fail with our greater forces of the present to regain and create a Europe freer, stronger, and more united than that which now seems to be shaken to the depths.

The process of gaining a greater unity among the leading nations of the world, like all the aspects of human evolution, must be regarded from two points of view, distinct in theory, inextricable in life. What does the nature of man itself demand? How has this nature expressed itself, and been affected in history by the external conditions, the geography, climate, conflict and commingling of races, which the theatre of its appearance has imposed?

Looked at in itself, so far as we can isolate it from its surroundings, man's nature is distinguished from that of lower animals by two features, both of them essentially social and tending to unity. He is more deeply and permanently attached to members of his own species, by affection, sympathy, veneration, tradition, than any other creature. And he is a reasoning being, reason itself requiring the contact and agreement of various minds. The incomparably greater force which he has acquired in the world, over all other species and over nature itself, is due to the working of these two factors. At starting he was physically less strong than many other creatures, and if he fought with others of his own kind, other animal species did the same. He was ahead of them by his reason, and reason acted, and must act, through the concert of thinking beings. This concert is not merely, or even mainly, an attachment among those living at the same time to co-operate for some common end; it is with man a conscious sequence of one generation on another. Sometimes the movement of adaptation is slower, sometimes quicker, but in every case the living are carrying on the work of the dead, and their co-operation in time as well as space is due to the working of the same qualities of attachment and reason, the social factors, by which at any moment a community of men is bound together.

Still looking at the matter a priori, it is clear that the vast community of mankind, though it has come more closely in contact in recent years over all the planet, yet acts, and must act, habitually and momentarily, through many smaller aggregates. Of these the leading types are the family and the country or nation. The former is not directly relevant to our inquiry, the latter plays a leading part in it. The former is less dependent on external conditions of land-formation and the like, and is in consequence more universal, more purely human. The latter has been shaped by geographical conditions, by racial qualities, by the apparent accidents of history. Its relation to the larger units of human society raises the most difficult, fundamental and unavoidable questions. To curb aggressive nationalism is the root-problem of the present war. To reconcile permanently nationalism with humanity would be to establish the everlasting peace.

Western society, indeed the whole community of mankind, is built up of these smaller units, the family and the nation, with their various intermediate groupings, but the historical process has by no means conformed at all exactly to this logical order. Society has not been made in orderly fashion by forming families and then combining families to make hundreds, and hundreds to make counties, and counties nations, and so on to the whole. A German god might have done this, but the way of nature and history was less perfect. The minor forms of human association have been taking shape, being altered and on the whole improved, throughout the process. At one point, of high importance for our argument, a larger form of association was achieved before the necessary constituent elements were articulated. This was the Greco-Roman world encircling the Mediterranean and completed in the Roman Empire of the second century A.D. It was the nucleus from which the Western world of modern civilization has been developed; yet it was there, settled in its main outlines, before the national units which it required for internal harmony and cohesion had taken any definite shape. It is to the difficulties of their growth and mutual adjustment that we owe most of the conflicts of modern history.

We shall in this book go back first to a still earlier stage, a stage of pre-history, to a time when no one, not gifted with superhuman insight and prescience, could have foreseen the course which human civilization would pursue. All over the world, for tens of thousands of years, a culture persisted, associated with stone implements, and marked by a similarity which is often extremely striking, in races and tribes widely severed by distance and climatic conditions. The raw material of the human product in science, art, and invention was alike in texture although often exuberant in detail and imagination. But it had not yet the unity of an organic whole, knit by a common purpose and conscious of itself.

To gain the cohesion of large numbers of men by whom wealth could be created and sufficient leisure and independence secured for an intellectual life, not dictated by the necessities of existence, a special concurrence of favourable physical conditions was required. The rich and secluded river-basins of many parts of the world provided this, and in consequence we find similar large communities arising at the end of the Stone Age in such places as China, Peru, Mexico, and above all in Mesopotamia and Egypt. The last named derived their special importance for the sequel from their proximity to the Mediterranean, which was to act as the great meeting-place and training-school for adventurous spirits and inquiring minds. From the busy intercourse of these land-locked waters arose the civilization called Minoan, or Aegean, centring in Crete, itself to be surpassed by the trading activity of the Phoenicians and the art and science of the Greeks.

It is with the advent of the Greek that the seal is placed upon the claim of the Mediterranean to be the birthplace of the highest type of human civilization, the centre from which a unity of the spirit was to spread, until, by material force as well as by the conquering mind, the European or Western man was recognized as in the forefront of the race. The supremacy of the Greek lay in his achievement in three directions, as a thinker, as an artist, and as the builder of the city-state. For our present purpose the first and the last are the most important and the first the most important of all.

The city-state was important as the first example of a free, self-governing community in which the individual realized his powers by living—and dying—with and for his fellows. This new type of human community was of the highest moment in the sequel. In many points it was a model to the Romans, and thus became a fulcrum for the upward movement of the Western world. In the works, too, of the Greek philosophers, especially of Plato and Aristotle, it inspired the earliest and some of the deepest reflections on the nature of social life and government. But it never acquired the permanence of the political units needed to build up the European Commonwealth. For