Letter from [Hugh] Bertram Cox, Downing Street, to the Secretaries of the Royal Society 'Gentlemen, With reference to the letter from this Department of the 7th of July last, I am directed by Mr. Secretary Lyttelton to transmit to you a copy of a minute by the Principal Veterinary Surgeon in Natal relative to the use of arsenic in the treatment of trypanosoma disease of cattle in that Colony. I am, Gentlemen, Your obdedient Servant, H Bertram Cox'. Enclosed is a copy of the minute referred to in the letter dated 1 September 1904, by S B Wollatt, Principal Veterinary Surgeon, and remarks the use of arsenic 'appears to have sme controlling effect upon the disease' though 'its curative properties are of no practical value'. 12 October 1904