Referee's report by Rudolf Peierls, on a paper 'Equilibrium structure of crystal surfaces. I. Steps and two dimensional nuclei' by William Keith Burton and Nicolás Cabrera Sectional committee: Physics Paper reference code: A52 Recommended for publication in Philosophical Transactions A: 'There is no doubt that this paper contains interesting work which should be published. I am not too happy about its presentation, however, even though it appears that from a first draft several people have already attempted to improve the form [...] I feel that the work contains much that is new and of value but just for that reason trouble should be taken to make it intelligible.' Provides detailed revisions. [Published in Philosophical Transactions A, 1951]. Date received not given. 4 July 1950