Letter from John David Griffith Davies, regarding two papers 'The diffraction of sound pulses III. Note on an integral occurring in the theory of diffraction by a semi-infinite screen' and 'The diffraction of sound pulses IV. On a paradox in the theory of reflexion' by Frederick Gerard Friedlander Sectional Committee: Physics The previous parts were seen in March 1940, and recommended that it be withheld from publication until after the war. The Secretaries request opinion on these next two parts. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on recto as received 26 November 1941. [1941]