Referee's report by Walter Heape, on paper 'The effects on fertility and the sex-ratio of sub-sterility exposures to X-rays' by Alan Sterling Parkes Sectional committee: Physiology Recommended for publication, in full. The experiments are 'carefully designed and the results presented with conscientious fairness'. The problem he aims to solve isn't answered nut 'the evidence presented is of sounds scientific value'. [Published in Proceedings of the Royal Society B, 1925]. Endorsed on verso as received 18 May 1925. May 1925