Referee's report by James Peter Hill, on a paper 'The differential action of X-rays on tissue growth and vitality. Part I' by Warnford Moppett Sectional Committee: Physiology Recommended for publication in the 'Proceedings of the Royal Society of London'. Does not feel confident to judge the techniques used. Suggests improving the title, reference should be made to the work of other researchers if possible, and further cross-reference between the text and figures should be given. [Published in the 'Proceedings of the Royal Society of London' B, 1929] Endorsed on verso as received 10 June 1929. [June 1929]