Referee's report by David Keilin, on a paper 'Metabolic changes which form the basis of a microbiological assay of nicotinic acid' by H McIlwain Sectional Committee: Physiology and Medical Sciences Declines to comment regarding publication in the 'Proceedings of the Royal Society of London', as the work is outside his field of study. Finds the paper more suitable for the Journal of General Microbiology or the Biochemical Journal, where interested workers are most likely to look for such a paper. Publication by the Royal Society may cause delay in the work reaching interested parties. Suggests the paper be sent to Marjory Stephenson, Paul Gordon Fildes and Cyril Norman Hinshelwood. [Published in the 'Proceedings of the Royal Society of London'] No received date. 26 June 1948