Copy letter from Robert William Frederick Harrison, to the Assistant Secretary, Marine Department, Board of Trade, 7 Whitehall Gardens, S.W. 'Sir, I have to acknowledge the receipt of your letter (M 17711) of the 12th inst., with reference to the cause of Scurvy and the efficacy of limejuice and fresh vegetable theories of prevention. A reply shall be made in due course. I am, Sir, Your obedient Servant, Robt Harrison Asst Sec R. S. [Assistant Secretary, Royal Society]'. 13 October 1899