Referee's report by James de Graaff-Hunter, on a paper 'Travel times in seismology' by Harold Jeffreys Sectional committee: Mathematics The paper could be published in the 'Bureau Central International de Séismologie' instead. The appendix should be omitted and modifications are required. There should be a fuller explanation of the use of the appendix and an improvement of the press copy. [Not published]. Endorsed on verso as received 18 July 1935. 17 July 1935