Referee's report by William Arthur Bone, on a paper 'Estimation of the combustion products from the cylinder of the petrol engine and its relation to "knock"' by Alfred Charles Glyn Egerton, F Ll Smith and Alfred Rene Jean Paul Ubbelohde Sectional Committee: Chemistry No clear statement regarding publication in the 'Philosophical Transactions of the Royal Society'. Considers the paper more suitable for an engineering or technical society. The experimental proceedure is open to criticism, especially in the chemical aspects. Suggests the authors use the more definite term 'oxidising substance' instead of the more general 'peroxide', and 'explosion' for 'detonation'. Suggests the authors be clearer about the chemicals used. The analyses are incomplete. [Published in the Philosophical Transactions of the Royal Society] Endorsed on verso as received 22 June 1934. 20 June 1934