Copy letter from Robert William Frederick Harrison, to Professor [Charles Herbert] Lees, Fellow of the Royal Society, Chairman of the Physics and Chemistry Committee) The paper by H Thirkell on the 'Recombination of the ions produced by Rontgen rays' has now been returned to the author, to whom it was sent for condensation. Although the actual reduction in length does not run to more than three or four pages Professor [Arthur] Schuster thinks it might go forward now if Lees has no objection. 8 May 1913