In the preparation of this volume, the author has utilised pertinent material wherever it was to be found. While it is impossible to acknowledge every source individually, mention must, however, be made of Hillebrand and Lundell's Applied Inorganic Analysis (1929) and of Mitchell and Ward's Modern Methods in Quantitative Chemical Analysis (1932). In conclusin, the writer wishes to express his thanks: to Dr G. H. Jeffery, A.I.C., for reading for reading some of the galley proofs, to his laboratory steward, Mr. F. Mathie, for preparing a number of the diagroms, including most of those in Chapter VI, and for his assistance in other ways, to Messrs. A. Gallenkamp and Co., Ltd., of London, E.C.2., and to Messrs. Fisher Scientific Co, of Pittsburgh, Pa., for providing a number of diagrams and blocks, and to Mr. F. W. Clifford, F.L.A., Librarian to the Chemical Society, and his able assistats for their help in the task of searching the extensive literature. Any suggestions for imporving the book will be gratefully received by the author.