Referee's report by Archibald Vivian Hill, on a paper 'A theoretical study of the influence of diffusion and chemical reaction velocity on the rate of exchange of carbon monoxide and oxygen between the red blood corpuscle and the surrounding fluid' by Phyllis Nicolson and Francis John Worsley Roughton Sectional committee: Physiology Paper reference code: B38 Recommended for publication in the Proceedings. Hill remarks he has written this report without any critical examination of the mathematical and numerical argument as the authors are more knowledgeable on the subject than he is. [Published in Proceedings B, 1951]. Date received not given. 8 September 1950