WE have received from Messrs. John G. Stein and Co., Ltd., of Bonnybridge, Scotland, an interesting catalogue of refractory materials, dealing with various grades of firebricks, silica bricks, cements, retorts, etc. This firm has an output of one million refractory bricks weekly. All the clays required are obtained from the firm's own mines, and throughout the process of manufacture every factor is scientifically controlled, thus ensuring uniformity of products. The catalogue, which is well produced and illustrated in colour, gives a number of useful tables and formulse, together with lists of the principal uses of the products. It contains some phase rule diagrams, for example, of the forms of silica and of the system SiO2—Al2O3, and a glossary of terms relating to silica and fireclay refractories. Special shapes will be made when required, the manufacturers being willing to cooperate in producing a satisfactory result in such cases. This catalogue is of a type which deserves every commendation, since it indicates a close cooperation of scientific and technical knowledge and a realisation of the importance of research in maintaining the quality of the products and in making progress in new directions, which are most encouraging.