Referee's report by Nevill Francis Mott, on a paper 'Slip planes and the energy of dislocations' by B Chalmers and Ursula M Martius Sectional committee: Physics Paper reference code: A260 Recommended for publication in the Proceedings with Mott's comments and suggestions on three additional pages. Mott suggests detailed comments be sent to the author's and the paper be amended accordingly. [Published in Proceedings A, 1952]. Date received not given. 20 November 1951