Copy letter from Robert William Frederick Harrison, to Professor Sidney Harris Cox Martin, Fellow of the Royal Society Walker has returned the corrected proof of his paper on 'Observations on the Life History of Leucocytes. Part II: On the Origin of the Granules', with an additional note referring to the work done by Professor Matthews of Chicago on the 'Origin of Granules from Threads'. This was made a condition of publication by the Physiology Committee, and suggested by [William Bate] Hardy. Asks if this note is satisfactory, or whether it should be sent to Hardy for his approval. 19 March 1907