While pottery had been first introduced by the staff of the Prince about one-half million years ago, the making of clay vessels had practically ceased for over one hundred and fifty thousand years. Only the gulf coast pre-Sumerian Nodites continued to make clay vessels. The art of pottery making was revived during Adam's time. The dissemination of this art was simultaneous with the extension of the desert areas of Africa, Arabia, and central Asia, and it spread in successive waves of improving technique from Mesopotamia out over the Eastern Hemisphere.

These civilizations of the Andite age cannot always be traced by the stages of their pottery or other arts. The smooth course of human evolution was tremendously complicated by the regimes of both Dalamatia and Eden. It often occurs that the later vases and implements are inferior to the earlier products of the purer Andite peoples.

The climatic destruction of the rich, open grassland hunting and grazing grounds of Turkestan, beginning about 12,000 B.C., compelled the men of those regions to resort to new forms of industry and crude manufacturing. Some turned to the cultivation of domesticated flocks, others became agriculturists or collectors of water-borne food, but the higher type of Andite intellects chose to engage in trade and manufacture. It even became the custom for entire tribes to dedicate themselves to the development of a single industry. From the valley of the Nile to the Hindu Kush and from the Ganges to the Yellow River, the chief business of the superior tribes became the cultivation of the soil, with commerce as a side line.

The increase in trade and in the manufacture of raw materials into various articles of commerce was directly instrumental in producing those early and semipeaceful communities which were so influential in spreading the culture and the arts of civilization. Before the era of extensive world trade, social communities were tribal—expanded family groups. Trade brought into fellowship different sorts of human beings, thus contributing to a more speedy cross-fertilization of culture.

About twelve thousand years ago the era of the independent cities was dawning. And these primitive trading and manufacturing cities were always surrounded by zones of agriculture and cattle raising. While it is true that industry was promoted by the elevation of the standards of living, you should have no misconception regarding the refinements of early urban life. The early races were not overly neat and clean, and the average primitive community rose from one to two feet every twenty-five years as the result of the mere accumulation of dirt and trash. Certain of these olden cities also rose above the surrounding ground very quickly because their unbaked mud huts were short-lived, and it was the custom to build new dwellings directly on top of the ruins of the old.

The widespread use of metals was a feature of this era of the early industrial and trading cities. You have already found a bronze culture in Turkestan dating before 9000 B.C., and the Andites early learned to work in iron, gold, and copper, as well. But conditions were very different away from the more advanced centers of civilization. There were no distinct periods, such as the Stone, Bronze, and Iron Ages; all three existed at the same time in different localities.