Darlington visited Johannesburg and Pretoria and made tours to 'S.W. Africa, Transkei and Northern Transvaal [Bantu] Homelands'. He lectured in Pretoria on genetics and the origin of society, 22 Jul 1963. He broke his return journey to spend a few days in Kenya. He accumulated much material which he later used for his book The Evolution of Man and Society.

Material comprises correspondence re visit to East Africa.