Referee's report by John William Nicholson, 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'. Has found the paper difficult to review. Suggests a change in 'the mode of presentation' might improve clarity. [Published in the Philosophical Transactions of the Royal Society A, 1920] Endorsed on recto as received 7 July 1918. [July 1918]