2. THE INTERCOURSE OF THREE SPECIES
In a few thousand years the new species filled the region from Afghanistan to the China Sea, overran India, and penetrated far into the new Australasian continent. Its advance was less military than cultural. The remaining tribes of the First Men, with whom the new species could not normally interbreed, were unable to live up to the higher culture that flooded round them and over them. They faded out.
For some further thousands of years the Second Men remained as noble savages, then passed rapidly through the pastoral into the agricultural stage. In this era they sent an expedition across the new and gigantic Hindu Kush to explore Africa. Here it was that they came upon the subhuman descendants of the ship’s crew that had sailed from Siberia millions o
