BOOK REVIEWS: Metallurgy; Electro-Metallurgy; Der Betriebs-Chemiker; The Chemical Analysis of Iron; Laboratory Guide of Industrial Chemistry; Soils and Fertilizers; The Manufacture of Lubricants, Shoe-Polishes, and Leather Dressings; Liquid and Gaseous Fuels and the Part They Play in Modern Power Production; The Power Handbooks; Methods and Devices for Bacterial Treatment of Sewage.