Referee's report by Douglas Rayner Hartree, on a paper 'The electronic band structure of PbS' by D G Bell, D M Hum, L Pincherle, Dennis William Sciama and P M Woodward Sectional committee: Mathematics Paper reference code: A168 Recommended for publication in the Proceedings. Hartree's comments on his concerns regarding the sue of groups of initials as abbreviations, and the arguments regarding wave functions. Attached is a printed letter from D C Martin, Assistant Secretary of the Royal Society, asking Hartree, [Published in Proceedings A, 1953]. Date received not given. 11 October 1952