Referee's report by Edmund Taylor Whittaker, on a paper 'A critical study of spectral series.—Part V. The spectra of the monatomic gases' by William Mitchinson Hicks Sectional Committee: Physics Recommended for publication in the 'Philosophical Transactions of the Royal Society'. A complete review of the paper would take much more time than is available. The paper is worth the current high cost of printing. [Published in the Philosophical Transactions of the Royal Society A, 1920] Endorsed on recto as received 5 August 1918. [August 1918]