Referee's report by Sydney Chapman, on a paper 'A mathematical theory of evolution, based on the conclusions of Dr. J. C. Willis' by George Udny Yule Sectional committee: Botany Does not state whether the paper is recommended for publication in Philosophical Transactions or Proceedings. It 'appears to have much value' and is a 'necessary part of the discussion'. It is also 'over long and elaborate in comparison to the contribution to knowledge which it may be regarded as making'. [Published in Philosophical Transactions A, 1925]. Endorsed on verso as received 19 October 1923. October 1923