Copy letter from Robert William Frederick Harrison, to Gustav Mann, Physiological Laboratory, Oxford 'Dear Sir, With reference to your letter of May 3rd enquiring about an adapter for the two Leiss planar lenses returned to you, I am now able to enclose a memorandum from the Clerk to the Government Grant Committee which will explain the situation in regard thereto. I am, yours faithfully, Robt [Robert] Harrison Asst Sec RS. [Assistant Secretary, Royal Society]'. 6 May 1904