34 THE ANALYST REVIEW. TECHNICAL METHODS OF ORE ANALYSIS. By ALBERT €1. LOW, B.S. New York: Wiley and Sons. London : Chapman and Hall. Pp. 273. Price 12s. 6d. This work is written for those who are interested in determining only the main constituent in a mineral; consequently the general composition of the ore is dealt with only so far as the means of securing solution may be affected thereby. After some useful introductory remarks on apparatus, electrolysis, and logarithms, the elements are dealt with in alphabetical order, from aluminium to zinc, each element having, as a rule, a chapter to itself. All the common metals come thus in turn under review, as well as molybdenum, titanium, tungsten, uranium and vanadium, chlorine, phosphorus, silica, and sulphur. Some chapters on the examina- tion of boiler water, c o d and coke, and crude petroleum, and, finally, a good index, complete the work.THE ANALYST.35 The methods selected are usually volumetric, and are well suited for technical purposes. A special feature of the work is the fulness of detail with which each step in the method of analysis is described; all the precautions to be observed and pitfalls to be avoided are pointed out. When writing the later chapters the author has resisted the temptation of referring to earlier chapters, in which substantially the same methods of manipulation had been already fully described. By this repetition of details and precautions each chapter is made complete in itself, and the value and convenience of the work is greatly increased thereby. The alphabetical arrange- ment of the matter makes it possible to turn at once to what one wants, and the instructions are clear and exact. The printing and general style of the book is good. The work can be confidently recommended. J. H. B. J.