Referee's report by John Monteath Robertson, on a paper 'An X-ray study of horse methaemoglobin. I' by Joy Boyes-Watson, Edna Davidson and Max Ferdinand Perutz Sectional committee: Physics Recommended for publication in Philosophical Transactions, due to it's length. It is important,well written and readable. It could also be published in Proceedings. [Published in Proceedings of the Royal Society A, 1947]. Date received not given. 1947