Referee's report by Edmund Taylor Whittaker, on a paper 'Approximately permanent electronic orbits and the origin of spectral series' by George Walker Walker Sectional Committee: Physics and Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. The hypothesis may not be correct, but any thoughtful discussion of the subject is worth publication. [Published in the 'Proceedings of the Royal Society of London', 1915] Endorsed on verso as received 27 November 1914. [November 1914]