Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Clerk of the Society of Apothecaries; Water Lane, E.C.4. 'In reply to your inquiry of the 5th instant the usual latin designation of a Fellow of the Royal Society is "Regiae Societatis Socius". I note from old engravings and other documents that this was in the past abbreviated to "R.S.S.".' 7 September 1927