Copy letter from Robert William Frederick Harrison, to A D Darbishire, Royal College of Science, South Kensington, S.W. 'Dear Sir, I send a line to say that we have no microscopes of our own for use at the weekly meetings, so that you should arrange to bring the three microscopes. We will, however, provide three lamps for you. I am, faithfully yours, Robt [Robert] Harrison Assistant Secretary R.S. [Royal Society]'. 13 November 1907