Copy letter from Herbert Rix, to Dr Thomas Clifford Allbutt, Fellow of the Royal Society 'Our clerk tells me that you paid a guinea in cash at the rooms on Monday. If so, you have paid twice over; since we had already received your cheque for that amount. I return you the cheque herewith. Yours truly, Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]' 3 December 1890