CHEMICAL ANALYSIS: A GUIDE IN THE PRACTICAL STUDY OF CHEMISTRY AND IN THE WORK OF ANALYSIS. BY ALBERT B. PRESCOTT, Ph.D., AND OTIS C. JOHNSON, M.A. FOURTH FULLY REVISED EDITION, NEW YORK: D. VAN NOSTRAND COMPANY, 23 MURRAY AND 27 WARREN STS. 1895. PUBLIC PREFACE TO THE FOURTH REVISED EDITION. In this edition the text has been mostly rewritten, to bring in the later results and to agree with fuller experience. The metalloids and acids have received more adequate treatment, and throughout the work the descriptive chemistry has been enlarged, in systematic arrangement. To gain room for these additions, some verbal condensation has been made all through the book, and such matter as could best be spared, including the introductory chapter, has been omitted. limits of size, the edition is only 12 pages larger than the previous one. With a design to keep within previous In the preface to the first edition it was said to be the chief object in the work "to aid the student in gaining accurate acquaintance with the facts whereby analyses are made, and a clear understanding of the co-ordination of these facts-the principles of analysis." And the authors still believe that the best study of analytical chemistry is among the best of the methods for the study of general chemistry. In this edition, with the purpose to bring together varied resources of analysis for co-operation with each other, to a wider knowledge of chemical reactions, the chief plans for quantitative analysis have been introduced. These are in no case to be resorted to as directions for quantitative operations, which require a strict control of details not presented in this work. With the same purpose, under a like limitation, the leading methods of preparation or of manufacture of compounds are indicated, in order following the statements of " in chemical description. sources The special treatment of reactions of oxidation and reduction was introduced by one of the present authors in the third revised edition, and is now extended through the text upon metalloids and acids. The use of negative as well as positive units of valence has been found most helpful for the statement of reactions of oxidation, and is now offered in its proper notation, where required throughout Part II., but this additional not will not in the least embarrass readers who would omit it. The first edition of this work appeared in 1873, the second revised edition and the third in 1880. With the first edition were incorporated the Tables for Qu Analysis by Professor Silas H. Douglas, editions of which had appeared in 186 and 1868. Professor Douglas having some years since retired fr chemistry, and being by his long and most valuable services in c entitled to release, now withdraws his name from the authorship THE CHEMICAL LABORATORY OF THE UNIVERSITY OF MICHIGAN, |