Copy letter from Robert William Frederick Harrison, to Major Percy Alexander MacMahon, Fellow of the Royal Society Understands from Professor [Joseph] Larmor that he intends to withdraw a paper by Colonel Rawson on 'Kathode Ray Phenomena in Cirrus Levels at the Equator'. A written request is required, together with an undertaking in writing that the paper is to be treated as never having been communicated to the Royal Society. Sending a form for him to sign, to save time [no enclosures]. 28 November 1906