are the civilizations of the Hamites, its history is the record of these peoples and of their interaction with the two other African stocks, the Negro and the Bushmen, whether this influence was exerted by highly civilized Egyptians or by such wider pastoralists as are represented at the present day by the Beja and Somali....The incoming Hamites were pastoral Caucasians – arriving wave after wave – better armed as well as quicker witted than the dark agricultural Negroes."C. G. Seligman, The Races of Africa, London, 1930, p. 96 Following Giuseppe Sergi's (1901) classification of the Hamites, Seligman divides the Hamites into two groups: (a) "Eastern Hamites" and (b) "Northern Hamites". The former include the "ancient and modern Egyptians... the Beja, the Berberines (Barbara and Nubians), the Galla, the Somali, the Danakil and... Ethiopians". The latter branch includes the Berbers and the "Taureg and Tibu of the Sahara, the Fulbe of Western Sudan and the extinct Guanche of the Canary Islands". Seligman acknowledged varying degrees of Negroid admixture amongst the Hamitic groups, but emphasized throughout his major works the essential racial and cultural unity of the various Hamitic peoples. In his Some Aspects of the Hamitic Problem in the Anglo-Egyptian Sudan (1913), he writes that the Northern and Eastern Hamitic "groups shade into each other, and in many parts a Negro admixture has taken place, nevertheless, culturally if not always physically, either division stands apart from its fellow." The Hamites in general, and the Northern Hamites in particular, he asserted, have close "kinship with the European representatives of the Mediterranean race". Drawing from Coon, Seligman also discusses fairer features observed amongst a minority of Berbers or Northern Hamites, such as lighter skin, golden beards and blue eyes. Races of Africa, however, notably questions the belief held by some anthropologists in the early 20th century that these fairer traits, such as blondism, were introduced by a Nordic variety. In addition, Seligman laid stress on the common descent of Hamites with Semites, writing that "there is no doubt that the Hamites and Semites must be regarded as modifications of an original stock, and that their differentiation did not take place so very long ago, evidence for this statement being furnished by the persistence of common cultural traits and linguistic affinities. Physically their relationship is obvious". Races of Africa Races of Africa (1930) upon publication received positive reviews. It was considered to be the