Referee's report by Frederick Gugenheim Gregory, on a paper 'The production of extracellular nitrogenous substances by a blue-green alga' by Gordon Elliott Fogg Sectional committee: Botany Paper reference code: B50 Recommended for publication in the Proceedings. Gregory has made minor amendments in the text and more detailed comments in the report. [Published in Proceedings B, 1952]. Date received not given. 16 November 1951