Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent 'In future kindly address all communications to the undermentioned as follows: Mr. Horace Darwin, as Sir Horace Darwin, K.B.E., F.R.S. Lt. Col. [Albert George] Hadcock, as Lt. Col. Sir [Albert George] Hadcock, K.B.E., F.R.S.' 18 June 1918