It is possible to form a very clear picture of the Semite who issued from this region, for the life of the pastoral nomad, all the world over, is the same.[5] And even at the present day, in the hollows of the Arabian desert, there is enough deposit of moisture to allow of a sufficient growth of grass for pasture-lands, capable of supporting nomadic tribes, who move with their flocks of sheep and goats from one more favoured area to another. The life of such a nomad is forced into one mould by the conditions imposed by the desert; for the grass-land cannot support him and he must live on the milk and young of his flocks. He is purely a shepherd, carrying with him the simplest and lightest tents, tools, and weapons for his needs. The type of society is that of the patriarchal family, for each nomad tribe consists of a group of relatives; and, under the direction of their chief, not only the men of the clan, but the women and children, all take an active part in tending the flocks and in practising the simple arts of skin-curing and the weaving of hair and wool. So long as the pasture-lands can support his flocks, the nomad is content to leave the settled agriculturist beyond the desert edge in peace. Some of the semi-nomad tribes upon the margin of the cultivation may engage in barter with their more civilised neighbours, and even at times demand subsidies for leaving their crops in peace. But the bulk of the tribes would normally remain within their own area, while conditions existed which were capable of supplying the needs of their simple life. It is when the pasture lands dry up that the nomad must leave his own area or perish, and it is then that he descends upon the cultivation and proceeds to adapt himself to new conditions, should he conquer the settled races whose higher culture he himself absorbs.