THE third number of Sands, Clays and Minerals, a new quarterly magazine devoted to economic minerals, contains a series of articles covering a varied and attractive field. Particularly noteworthy is a paper on British coals by Mr. A. L. Curtis in which a wealth of interesting information on the origin, composition and classification of coals and related materials, such as graphite, jet and peat, is gathered together. This is effectively illustrated by a beautifully produced coloured plate showing typical hand-specimens of fourteen of the materials dealt with. Other articles describe raw materials such as sands, tripoli powder, and sapphire (with two plates of rough and cut stones); research methods involving the application of ultra-violet light, elutriation, magnetism and heavy liquids; the mining of china clay, the properties of refractory cements, the decay and restoration of building stones, and the sources and uses of tantalum and niobium. The magazine is likely to be of great service to technical and commercial men who are interested in mineral products but may not have the time or opportunity to follow the more specialised literature. It is published by Mr. A. L. Curtis, Westmoor Laboratory, Chatteris, the annual subscription being 5s.