Copy letter from Robert William Frederick Harrison, to Professor John Henry Poynting, Fellow of the Royal Society Reminds Poynting that the paper by Mr Townsend, on 'The Diffusion of Ions into Gases' has been in his hands for report since 18th May. As the Physics and Chemistry Committee meets at the beginning of next week it would be a great convenience if Poynting could let him have his report before then. 5 June 1899