Copy letter from Herbert Rix, to Professor John Scott Burdon-Sanderson, Fellow of the Royal Society 'Dear Sir, About two years ago Dr Foster wrote to ask if you would undertake an obituary for Dr Cabbold, & I believe that you consented; but I cannot find that we have ever received the MS. [manuscript]. Am I right? Yours faithfully Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 10 April 1889