Referee's report by Charles James Martin, on a paper 'Cell structure and cell activity' by Margaret Penrose and Frederick Gowland Hopkins Sectional committee: Physiology Recommended for publication in Proceedings. Roughly twenty per cent of the paper could be omitted, without decreasing the paper's value. [Published in Proceedings of the Royal Society B, 1930]. Endorsed on verso as received 24 July 1930. 23 July 1930