Copy letter from Herbert Rix, to Arthur Sheridan Lea, Fellow of the Royal Society 'I enclose proof of the Supplementary Certificate form. It is quite correct, & unless you prefer to wait a day or two till I get some pressed copies, may be used for Dr Stirling's additional qualifications. You will see the new statute on the back. Yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 15 July 1892