When man does not interfere and the soil is left to itself, it does not fail. Through it everything that has passed from a state of life is restored again to a state of life; nothing fails or is lost. In the philosophy of modern science, however, the seeds that life scattered upon the ground and do not fructify are stigmatized as failures, but those that grow into plants are dubbed the fittest, because they survive and expand into plants. Yet the other seeds survive no less; they re-enter cycles of life by other paths. Each has its place without which the whole is incomplete. Each has its place in a creative cycle, each passes from soil to plant and then, in many cases, to animal, and, after an interlude of death, returns to the creative realm of soil.

The spread of the degradation of the soil was centrifugal from Latium itself outwards. Varro noted abandoned fields in Latium, and two centuries later Columella, about A.D. 60, referred to all Latium as a country where the people would have died of starvation, but for their share of Rome’s imported corn. The Roman armies moved outwards from Latium demanding land; victory gave more land to the farmers; excessive demands again brought exhaustion of fertility; again the armies moved outwards.

In order to get a clear idea of the modern valuation of the soil and its effects, it is well to begin with the opposite of the unavoidable sketchiness of a trans-continental survey, such as that of the last chapter, and to concentrate upon self-contained examples on a small scale. Small islands offer themselves at once as the opposite to great continents. By nature they are self-contained. Their inhabitants get food from the sea, a source with which they are unable to interfere as they can with the soil. Sea-food, therefore, has the natural quality of wholeness. Health, therefore, should be found in such islands.

The word primitive is defined by Annandale’s Concise Dictionary as ‘characterized by the simplicity of the old times.’ The lexicographer, with this definition, hits off with happy ease an exact description of the primitive peoples of this chapter and of the two that follow it. ‘The simplicity of old times’ just fits, for the lexicographer informs us under the word ‘simple’ that it derives ‘from a root meaning one or unity.’ We can now paraphrase our heading of Primitive Farmers, as Farmers characterized by unity. We must do this quickly before going on to read other definitions of ‘simple,’ for we shall find that one of them is ‘easily intelligible,’ and farmers characterized by unity are not a bit easily understood by modern peoples. It is because they have so rarely been understood that so many troubles have come to them from the moderns.

This advantage of perennial irrigation is brought about by a permanent high level of the river above a dam or barrage placed in its course. Main canals lead off the heightened water from above the dam and minor canals distribute it. It makes constant use of the artificial high level of the river, and, using the water that flows in the river all the year round, it is obviously not wasteful but conservative. But there is one daring thing about perennial irrigation; it alters the age-long habit of river-made soils in arid countries. What it is made to do is, in fact, to treat these arid soils as if they were soils dependent upon frequent rain, for by means of locks and gates there is a giving of water every ten to twenty days.