Recent Books Analytical Chemistry, Vol. I, Qualitative Analysis. Based on the German teat Polytechnic Instiof F. P. TREADWELL, tute of Ziirich, translated and revised by WILLIAMT. HALL, Massachusetts Institute of Technology. Eighth English edition. John Wiley &Sons, Inc.. 640 pp. New York City, 1932. xi 24 Figs. 15 X 23 cm. $4.50.
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The most extensive change in this new edition consists in the addition, as an appendix, of a twenty-six page syllabus, presenting an outline of the course of instruction given a t the Massachusetts Institute of Technology. This supplement. which is chiefly accountable for the increase in size over the previous edition from 610 pages t o 640, unquestionably renders the work much more readily sdaptable t o use as a laboratory manual and textbook, and will be welcomed by all who contemplate its use in these capacities. At the same time, i t is a matter for gratification that the characteristic arrangement of the hody of the text has not been modified. For among present-day treatises upon qualitative analysis, this is one of the few which does not present the subject matter in a form suited exclusively t o use in beginners' courses, and very little adapted to the needs of the more advanced worker who must occasionally refresh and extend his knowledge of this branch of chemistry. The more recent editions of this work have become so comprehensive, and so well-matured, that it is not surprising t o find that alterations in the hody of the text are confined t o minor refinements and to a few revisions and rearrangements of sections relating to certain of the lesscommon elements. Changes of this character include the removal of tantalum and niobium (now become columbium) from the ammonium sulfide group of the systematic procedure to a newly added acidforming group, where they are joined hy
tungsten, transferred from the hydrogen sulfide group. I n like manner, the elements thallium, indium, gallium, and vanadium have altered their company, and now appear among the members of the ammonium sulfide group, instead of in the hydrogen sulfide group, as heretofore. All this is in accord with the adaptation of the procedures to the more recent advances in the analytical chemistry of the rare, or once-rare, elements. The new edition differs so little from the one preceding, except in the details just mentioned, that further description seems supenluous. And criticism of so excellent a work is hardly gracious, the more so since such omissions as occur are probably dictated largely by limitations of space. It might perhaps he suggested, -however, that the di&&ns of the theory of electrolytic dissociation, and its applications to analytical reactions, could with advantage give t o the student rather more intimation of the doubts and Limitations to wgich that theory is a t the present time subjeci With this possible exception, the reviewer can find little save t o uraise in this edition.
A Course in Quantitative Analysis. J. SAMUEL GUY, Professor of Chemistry, Emory University, and Auousrn SKEEN, Assistant Professor of Chemistry, Agnes Scott College. Ginn & Co.. Boston, 242 pp. 11 Figs. Mass., 1932. xiv 14 X 20.5 em. $2.20.
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The hook is divided into an Introduction of 38 pages and three Parts. Fifteen pages of the Introduction are devoted to "A Brief Outline of Some Chemical. Theories" and 23 pages t o "General Directions" covering the technic of both gravimetric and volumetric analysis. Part I, 85 pages, is devoted t o volumetric methods; Part 11. 23 pages, t o gravimetric
