Copy letter from Robert William Frederick Harrison to Professor Heinrich Kayser, Bonn 'Your note of the 29th December to Sir Joseph Larmor has come into my hands for investigation, and I deeply regret to find on enquiry that the diploma of Foreign Membership which I ordered to be despatched to you on December 9th last was misdirected, and has gone astray in the post. I have at once set on foot enquiries with the object of recovering it, and so soon as I succeed it shall be sent on to you without further delay. In the meantime I hope you will accept my profound apologies for this office blunder and rest assured that I will neglect no means to remedy it as promptly as possible.' 3 January 1912