Copy letter from Herbert Rix, to Professor Frank H Bigelow, 1416 K. Street N.W., Washington D.C., USA 'Dear Sir, We have no copies of the paper mentioned in yours (not dated) received today. I have informed Mr Wilde of your application, & he may perhaps be able to send you one himself. Yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 31 December 1891