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 Geoffrey Ingram Taylor The two papers that he communicated can be printed for government use, though not published at present. Thanks him for his 'long and helpful' report on a paper by Payman and Shepard. [Both papers published in Proceedings of the Royal Society A, 1946]. 2 May 1940