Copy letter from Herbert Rix, to Messrs Cassell & Company Limited, La Belle Sauvage, Ludgate Hill, E.C. 'Dear Sirs, I have to acknowledge receipt of the Magnetic Survey Maps as advised in yours of the 28th. I have pleasure in repeating the instruction which I have already written to you --- that the bulk of these maps are to be sent to Messrs Harrison & Sons, 45 St. Martin's Lane. Yours faithfully, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 30 March 1896