Referee's report by Otto Rosenheim, on a paper 'Studies on the nature of the amphibian organization centre IV—Further experiments on the chemistry of the evocator' by Conrad Hal Waddingto, Joseph Needham, W W Nowinski, Max Rudolf Lemberg and Arthur Cohen Sectional Committee: Physiology Recommended for publication in the 'Proceedings of the Royal Society of London'. Finds the use of the term 'pink sterol' undesirable, as the pink colour indicates an impurity. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 24 January 1936. [January 1936]