Letter from John Roscoe, Orvington Rectory, Thetford, to Robert Harrison, Assistant Secretary of the Royal Society Realises that he does not have a map of Victoria Lake, in Africa. Asks if the Royal Society can spare the ones shown to Roscoe on Monday. Notes that the letters of introduction to the Governors of East Africa and Uganda which Sir [Everard im] Thurn promised to get for Roscoe from the Colonial Office have not yet come. 4 April 1919