Referee's report by Eric Keightley Rideal, on a paper 'I. The construction of a sensitive and stable quartz microbalance and its use in the determination of gaseous densities; II. A determination of the atomic weights of carbon and nitrogen by the micro-technique' by B Lambert and C S G Phillips Sectional committee: Chemistry Recommended for publication in Proceedings. It is a very careful piece of work that is written in a justified amount of detail. [Published in Philosophical Transactions A, 1950 under the title 'The determination of gaseous densities']. Date received not given. 1949