Referee's report by Harry Julius Emeléus, on a paper 'Calcium carbonate and its hydrates' by R Brooks, L M Clark and E F Thurston Sectional committee: Chemistry Paper reference code: A96 Recommended for publication in Philosophical Transactions: 'It breaks new ground in that, almost for the first time, a systematic attempt has been made to study the effect of added substances on the production of metastable phases. A good qualitative interpretation of the effects observed is also provided.' [Published in Proceedings A, 1950]. Date received not given. 27 June 1950