Referee's report by James Gray, on a paper 'Determination and differentiation in ascidian development' by Norman John Berrill Sectional committee: Zoology Recommended for publication, in part. Some of the conclusions are interesting but could be described more briefly. The style of the paper is vague. He 'may have misunderstood some of the author's ideas'. [Not published]. Endorsed on verso as received 17 July 1935. July 1935