*Sir Harry H. Johnston: _The Opening up of Africa_ (Home University
Library).
---- _A History of the Colonization of Africa by Alien Races_, Cambridge,
1905.
*G.W. Stowe: _The Native Races of South Africa_ (ed. by G.M. Theal),
London, 1910.
(Consult also Johnston's other works on Africa, and his article in Vol.
XLIII of the _Journal of the Royal Anthropological Institute of Great
Britain and Ireland_; also _Inter-Racial Problems, and_ Deniker, noted
above.)