Copy letter from Robert William Frederick Harrison, to Messrs Cassell & Company Limited 'Gentlemen, I have your letter of the 28th April, and I think that all I can do in this case is to offer to let your representative have an opportunity of inspecting the Challenger volumes. He will therefore be able to select the photographs he deems best for reproduction in Dr Traill's "Social England." I am, Gentlemen, faithfully yours, Robt [Robert] Harrison Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 3 May 1904