The first condition necessary to a real settling down of Neolithic men, as distinguished from a mere temporary settlement among abundant food, was of course a trustworthy all-the-year-round supply of water, fodder for the animals, food for themselves, and building material for their homes. There had to be everything they could need at any season, and no want that would tempt them to wander further. This was a possible state of affairs, no doubt, in many European and Asiatic valleys; and in many such valleys, as in the case of the Swiss lake-dwellings, men settled from a very early date indeed; but nowhere, of any countries now known to us, were these favourable conditions found upon such a scale, and nowhere did they hold good so surely year in and year out as in Egypt and in the country between the upper waters of the Euphrates and Tigris and the Persian Gulf.[101] Here was a constant water supply under enduring sunlight; trustworthy harvests year by year; in Mesopotamia wheat yielded, says Herodotus, two hundredfold to the sower; Pliny says that it was cut twice and afterwards yielded good fodder for sheep; there were abundant palms and many sorts of fruits; and as for building material, in Egypt there was clay and easily worked stone, and in Mesopotamia a clay that becomes a brick in the sunshine. In such countries men would cease to wander and settle down almost unawares; they would multiply and discover themselves numerous and by their numbers safe from any casual assailant. They multiplied, producing a denser human population than the earth had ever known before; their houses became more substantial, wild beasts were exterminated over great areas, the security of life increased so that ordinary men went about in the towns and fields without encumbering themselves with weapons, and, among themselves at least, they became peaceful peoples. Men took root as man had never taken root before.
But in the less fertile and more seasonal lands outside these favoured areas, there developed on the other hand a thinner, more active population of peoples, the primitive nomadic peoples. In contrast with the settled folk, the agriculturists, these nomads lived freely and dangerously. They were in comparison lean and hungry men. Their herding was still blended with hunting; they fought constantly for their pastures against hostile families. The discoveries in the elaboration of implements and the use of metals made by the settled peoples spread to them and improved their weapons. They followed the settled folk from Neolithic phase to Bronze phase. It is possible that, in the case of iron, the first users were nomadic. They became more warlike with better arms, and more capable of rapid movements with the improvement of their transport. One must not think of a nomadic stage as a predecessor of a settled stage in human affairs. To begin with, man was a slow drifter, following food. Then one sort of men began to settle down, and another sort became more distinctly nomadic. The settled sort began to rely more and more upon grain for food; the nomad began to make a greater use of milk for food. He bred his cows for milk. The two ways of life specialized in opposite directions. It was inevitable that nomad folk and the settled folk should clash, that the nomads should seem hard barbarians to the settled peoples, and the settled peoples soft and effeminate and very good plunder to the nomad peoples. Along the fringes of the developing civilizations there must have been a constant raiding and bickering between hardy nomad tribes and mountain tribes and the more numerous and less warlike peoples in the towns and villages.
For the most part this was a mere raiding of the borders. The settled folk had the weight of numbers on their side; the herdsmen might raid and loot, but they could not stay. That sort of mutual friction might go on for many generations. But ever and again we find some leader or some tribe amidst the disorder of free and independent nomads, powerful enough to force a sort of unity upon its kindred tribes, and then woe betide the nearest civilization. Down pour the united nomads on the unwarlike, unarmed plains, and there ensues a war of conquest. Instead of carrying off the booty, the conquerors settle down on the conquered land, which becomes all booty for them; the villagers and townsmen are reduced to servitude and tribute-paying, they become hewers of wood and drawers of water, and the leaders of the nomads become kings and princes, masters and aristocrats. They too settle down, they learn many of the arts and refinements of the conquered, they cease to be lean and hungry, but for many generations they retain traces of their old nomadic habits, they hunt and indulge in open-air sports, they drive and race chariots, they regard work, especially agricultural work, as the lot of an inferior race and class.
This in a thousand variations has been one of the main stories in history for the last seventy centuries or more. In the first history that we can clearly decipher we find already in all the civilized regions a distinction between a non-working ruler class and the working mass of the population. And we find too that after some generations, the aristocrat, having settled down, begins to respect the arts and refinements and law-abidingness of settlement, and to lose something of his original hardihood. He intermarries, he patches up a sort of toleration between conqueror and conquered; he exchanges religious ideas and learns the lessons upon which soil and climate insist. He becomes a part of the civilization he has captured. And as he does so, events gather towards a fresh invasion by the free adventurers of the outer world.[102]