Copy letter from Herbert Rix, to Messrs Clay & Sons, University Press, Cambridge If the Press has kept the wrappers of sheets for 40 and 41, Rix would be glad if they would allow him to send them with a letter of complaint to the General Post Office. The Royal Society keeps a strict record of dates of posting and the two sheets in question were posted soon after midday on 16 June and did not arrive till the 18th. 21 June 1890