Referee's report by Peter Brian Medawar, on a paper 'Nuclear components of dividing cells' by P M B Walker and Helen B Yates Sectional committee: Physiology Paper reference code: B18 Recommended for publication in the Proceedings. Medawar comments: 'The writers should specify the biological material more accurately; e.g. what cells were photographed in 'mouse spleen [?]'. The actual text of the paper should contain a statement about the types of explants used and the varieties of cells [?] from them.' [Published in Proceedings B, 1952]. Date received not given. 1 April 1952