Copy of referees' comments, on a paper 'Flame propagation in mixtures of combustible gases. II. Some properties of mixtures of hydrogen, organic substances and air at their upper limits of inflammability' by G Dixon Lewis and J W Linnett Paper reference code: A41 Anonymised referee comments to be provided to the authors of the paper [copies of comments made by Harry Work Melville and Alfred Charles Glyn Egerton. See RR/75/44 and RR/75/45]. [Published in Proceedings A, 1951]. Date received not given. [1951]