Copy letter from Robert William Frederick Harrison, to Monsieur le Professeur Marey 'Dear Sir, I have to acknowledge the receipt of your report made on behalf of the "Commission for the Control of Registering Instrument's and of the Unification of Methods in Physiology". The Report will be duly laid before the International Association Committee. I am, faithfully yours, Robert Harrison Assistant Secretary, R.S. [Royal Society]'. 18 January 1902