Referee's report by Charles Drummond Ellis, on three papers 'The transition effect of penetrating showers' and 'The barometer effect of penetrating showers' by L Jánossy and George Dixon Rochester, and 'Some aspects of the production of mesons and the barometer effect of penetrating showers' by L Jánossy Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Is not an expert on the subject, but the work appears original and the results are a real contribution. Enjoyed reading the papers, and found the ideas well expressed. 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. [1944]