Referee's report by Douglas Rayner Hartree, on a paper 'On the assignment of the fundamental vibration frequencies in O3, F2O, Cl2O, NO, and N3-' by Gordon Brims Black McIvor Sutherland and William George Penney Sectional Committee: Mathematics Recommended for publication in the 'Proceedings of the Royal Society of London'. Corrects an error with the units. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 7 May 1936. [May 1936]