Referee's report by Edward Neville da Costa Andrade, on 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 Recommended for publication in the 'Proceedings of the Royal Society of London'. Contains extra question - 'Is there any information contained in the paper which likely to be of value to the enemy?' Referee replies yes. Also enclosed, brief summaries for both papers. Refers to work of Arnold Johannes Wilhelm Sommerfeld. [Published in the 'Proceedings of the Royal Society of London'] No received date. [1941]