Referee's report by Hugh Longbourne Callendar, on a paper 'The pressure of explosions - experiments on solid & gaseous explosives' by James Ernest Petavel Assessment of a manuscript submitted for publication by the Royal Society, completed by the referee using a standard printed form. Sectional Committee: Physics and Chemistry Callendar thinks the paper should be published in the 'Philosophical Transactions' in full. He has not had time to study the paper in sufficient detail to suggest any modifications, but feels confident that it should be published practically as it stands. Published: 'The Pressure of Explosions. Experiments on Solid and Gaseous Explosives' by J E Petavel, Proc. R. Soc. Lond. A, 1905, 76, 492-494. Endorsed on verso as received 28 October 1905. [c 28 October 1905]