Referee's report by Charles Galton Darwin, on a paper 'A new coriolis perturbation in the methane spectrum. III. Intensities and optical spectrum' by H A Jahn Sectional committee: Physics Not recommended for publication. The paper seems good but is currently 'incomprehensible'. Publishing papers like this are 'spoiling the quality of the Proceedings'. Only a specialist could understand the paper. The authors should combine all their work into one Philosophical Transactions paper instead. [Published in Proceedings of the Royal Society A, 1939]. Endorsed on verso as received 24 October 1938. October 1938