79:6.5

Twenty thousand years ago the ancestors of the Chinese had built up a dozen strong centers of primitive culture and learning, especially along the Yellow River and the Yangtze. And now these centers began to be reinforced by the arrival of a steady stream of superior blended peoples from Sinkiang and Tibet. The migration from Tibet to the Yangtze valley was not so extensive as in the north, neither were the Tibetan centers so advanced as those of the Tarim basin. But both movements carried a certain amount of Andite blood eastward to the river settlements.