Copy letter from Robert William Frederick Harrison, to Charles Vernon Boys, Fellow of the Royal Society 'Dear Mr Boys, With reference to the suggestion as to an exhibition of Col. [Colonel] Black's photographs, the Officers would like you to tell him that an exhibit would be welcome. Later on, we will remind you about this, should Col. [Colonel] Black come to the Royal Institution. I am, very truly yours, R [Robert] Harrison Assistant Secretary R.S. [Royal Society]'. 9 April 1906