Referee's report by James Chadwick, on a paper 'Penetrating cosmic-ray showers' by L Jánossy Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests careful inspection for misprints and poor expression. Suggests specifying the dimensions of the tubes used in the experiment. Contains extra question - 'Is there any information contained in the paper which likely to be of value to the enemy?' Referee replies no. [Published in the 'Proceedings of the Royal Society of London'] No received date. [1941]