In conjunction with his Eurocentric view on human evolution in Europe as being separate from Africa, Keith shared scientific racist views with a number of other intellectuals and Writers during the 1920s, often based on Galtonism and the belief that opposition to cross-breeding in animals could be applied to miscegenation. In 1931, with John Walter Gregory, he delivered the annual Conway Hall lecture entitled Race as a Political Factor. The lecture contained as its abstract: The three primary racial groups within the human species are the Caucasian, mongoloid and negroid. From analogy with cross-breeding in animals and plants, and from experience of human cross-breeding, it can be asserted that inter-marriage between members of the three groups produces inferior progeny. Hence racial segregation is to be recommended. However, the different races can still assist, and co-operate with, each other, in the interests of peace and harmony.