Copy letter from Robert William Frederick Harrison, to Dr Edgar Philip Perman, University College, Cardiff 'Dear Sir, The paper entitled "Chemical Reaction between Salts in the Solid State", referred to by you in your letter of April 27th, has only to-day been communicated by Professor Griffiths for consideration with a view to its publication in the 'Proceedings [of the Royal Society]'. Believe me, faithfully yours, Robt [Robert] Harrison Asst. [Assistant] Secretary R.S. [Royal Society]'. 1 May 1907