Referee's report by Nevill Francis Mott, on a paper 'Calculated wave functions and energy values for X-ray terms of potassium' by W A Thatcher Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. The calculations should be published in full. The revised version of the paper is satisfactory. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 16 May 1939. [May 1939]