criticised. In 1974, writing about the African Great Lakes region, Christopher Ehret described the Hamitic hypothesis as the view that "almost everything more un-'primitive', sophisticated or more elaborate in East Africa [was] brought by culturally and politically dominant Hamites, immigrants from the North into East Africa, who were at least part Caucasoid in physical ancestry". He called this a "monothematic" model, which was "romantic, but unlikely" and "[had] been all but discarded, and rightly so". He further argued that there were a "multiplicity and variety" of contacts and influences passing between various peoples in Africa over time, something that he suggested the "one-directional" Hamitic model obscured. Subdivisions and physical traits Sergi outlined the constituent Hamitic physical types, which would form the basis for the work of later writers such as Carleton Coon and C. G. Seligman. In his book The Mediterranean Race (1901), he wrote that there was a distinct Hamitic ancestral stock, which could be divided into two subgroups: the Western Hamites (or Northern Hamites, comprising the Berbers of the Mediterranean, Atlantic and Sahara, Tibbu, Fula, and extinct Guanches), and the Eastern Hamites (or Ethiopids, comprising Ancient and Modern Egyptians (but not the Arabs in Egypt), Nubians, Beja, Abyssinians, Galla, Danakil, Somalis, Masai, Bahima and Watusi). According to Coon, typical Hamitic physical traits included narrow facial features; an orthognathous visage; light brown to dark brown skin tone; wavy, curly or straight hair; thick to thin lips without eversion; and a dolichocephalic to mesocephalic cranial index. According to Ashley Montagu "Among both the Northern and Eastern Hamites are to be found some of the most beautiful types of humanity." "Hamiticised Negroes" In the African Great Lakes region, Europeans based the various migration theories of Hamitic provenance in part on the long-held oral traditions of local populations such as the Tutsi and Hima (Bahima, Wahuma or Mhuma). These groups asserted that their founders were "white" migrants from the north (interpreted as the Horn of Africa and/or North Africa), who subsequently "lost" their original language, culture, and much of their physiognomy as they intermarried with the local Bantus. Explorer J.H. Speke recorded one such account from a Wahuma governor in his book, Journal of the Discovery of the Source of the Nile. According to Augustus Henry Keane, the Hima King Mutesa I also claimed Oromo (Galla) ancestors and still reportedly spoke an Oromo idiom, though that language had long since died out