A New Theory of Human Evolution  

"One hypothesis, adumbrated by Charles Darwin in The Descent of Man and developed at length by Arthur Keith in his nearly forgotten book A New Theory of Human Evolution (1949), postulates genocide and genosorption, that is, the elimination by murder or genetic absorption of some tribes by others..." --Bulletin of the Entomological Society of America - Page 22

"My friend Dr. Walter Heape (1855-1929), who made many important additions to our knowledge of the sexual processes in animals, became interested in his later years in their migrations, hoping to trace a connection between the migratory impulse and the state of the sexual system. His inquiries led him to study the opposite of the migratory impulse — the tendency of animals to cling to their homelands. After his death in 1929 at the age of seventy-four, the data he had collected were edited and published by Dr. Marshall." --A New Theory of Human Evolution (1948) by Arthur Keith