Referee's report by George Udny Yule, on a paper 'Competition between bivalents during chiasma formation' by Kenneth Mather Sectional committee: Zoology Recommended for publication in Proceedings. The paper 'can be passed from the statistical standpoint'. He is 'old-fashioned' and never made himself acquainted with analysis of variance but the author has used R A Fisher for guidance, so the method is sound. [Published in Proceedings of the Royal Society B, 1936]. Endorsed on verso as received 7 February 1936. 5 February 1936