Letter from Pickering giving the text of a cable from Charter (the British South Africa Company), London, about negotiations with H.M. Government over the boundary between Rhodesia (Zambia and Zimbabwe) and Bechuanaland (Botswana), and commenting on the Rivas and Rooipan Mines and the Barkly West election campaign; with copies of related reports from mineral and political agents, and a map, 8 Aug 1898