Copy letter from an unknown correspondent, to [Messrs Harrison & Sons] Asks the Messrs to prepare blocks of the 'Philosophical Transactions [of the Royal Society]' A, volume 200, 1902, paper by Professor Ewing and Mr Humfrey, plate seven, figures three, five and six, and plate eight, figure eight. Electros and the bill should be sent to Messrs Longmans, Green & Company, 39 Paternoster Row. 19 January 1905