Referee's report by William Thomas Astbury, 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 Proceedings. The paper is large and contains a lot of diagrams but should be published. There are a few typing errors that should be fixed. [Published in Proceedings of the Royal Society A, 1947]. Date received not given. 1947