Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Messrs Parke, Davis and Co.; Beak Street, Regent Street, W.1. Acknowledges the cheque sent by Messrs Parke, Davis and Co. for £7 4s, a refund in respect of goods they supplied for Dr [Arthur] W. Grace in British Guiana [on the Filariasis Commission]. 25 March 1927