Letter from J D Griffith Davies, Assistant Secretary of the Royal Society, on two papers 'The diffraction of sound pulses I. Diffraction by a semi-infinite plane' and 'The diffraction of sound pulses II. Diffraction by an infinite wedge' by Frederick Gerard Friedlander to A Ferguson The paper has been sent in line with Professor Egerton's request. The referee made no 'adverse criticism' of the paper but suggested it was not suitable for publication by The Royal Society, as it doesn't constitute an advance in knowledge of this subject. [Both papers published in Proceedings of the Royal Society A, 1946] 1 March 1940