Referee's report by Herbet Graham Cannon, on a paper 'The differentiation of neural crest cells into visceral cartilages and odontoblasts in Amblystoma, and a re-examination of the germ-layer theory' by Gavin Rylands De Beer Sectional committee:: Zoology Recommended for publication in Philosophical Transactions. A small modification is required. [Published in Proceedings of the Royal Society B, 1947]. Date received not given. 1946