Referee's report by Ronald Aylmer Fisher, on a paper 'A contribution to the mathematical theory of epidemics. Part IV' by William Ogilvy Kermack and A G McKendrick Sectional committee: Mathematics Recommended for publication in Proceedings, so long as someone with more expertise in this area of mathematics deems it to be of merit or originality. The paper forms part of a series, which has been previously published in Proceedings. [Not published]. Endorsed on verso as received 27 August 1935. August 1935