64:7.10

In general and to start with, the Sangik tribes were more intelligent than, and in most ways far superior to, the deteriorated descendants of the early Andonic plainsmen; and the mingling of these Sangik tribes with the Neanderthal peoples led to the immediate improvement of the older race. It was this infusion of Sangik blood, more especially that of the blue man, which produced that marked improvement in the Neanderthal peoples exhibited by the successive waves of increasingly intelligent tribes that swept over Europe from the east.