Copy letter from Robert William Frederick Harrison, to Professor George Francis Fitzgerald, Fellow of the Royal Society With reference to the paper by Mr Townsend, 'the Diffusion of Ions, &c'. now in Fitzgerald's hands for reference, it would be very convenient if Fitzgerald could report on the paper by next Monday 2 July, as the Sectional Committee which is dealing with it meets on Tuesday, and it is very desirable that the question of publication should be disposed of before the vacation. 28 June 1900