Referee's report by Patrick Maynard Stuart Blackett, Baron Blackett of Chelsea, on a paper 'The cascade theory of electronic showers' by Lev Davydovitch Landau and G Rumer Sectional Committee: Mathematics Recommended for publication in the 'Proceedings of the Royal Society of London'. Cannot judge the mathematics, but does not doubt it is right, as Lev Davydovitch Landau is a capable mathematical physicist. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 6 December 1937. 2 December 1937