Referee's report by James Gray, on a paper 'The biological response to gamma rays of Radium as a function of the intensity of radiation' by F G Spear and L G Grimmett Sectional Committee: Physiology Not recommended for publication in the 'Proceedings of the Royal Society of London'. The paper does not represent a substantial advance in knowledge. 'It may have empirical interest peculiar to the use of the radium 'bomb', but of this I can form no opinion'. The conclusions of the paper have been reached previously, and no reference to the work of others is made, implying they are unfamiliar with the important work done on the subject. [Not published] Endorsed on verso as received 7 March 1933. [March 1933]