Page 4 - APPLIED INORGANIC ANALYSIS

PREFACE vii

decomposition of minerals, the separation of elements from one another,
and even their determination. Notice of such omissions or of errors
will be greatly appreciated.
The term 'ordinary method of analysis'' as used in the discussions
under the heading ''General Considerations" throughout the book,
refers to the scheme of analysis in which the material is decomposed,
the solution evaporated with hydrochloric acid to obtain silica, and
successive precipitations with ammonium hydroxide, ammonium oxalate
and diammonium phosphate serve to separate the ''R,O,' group, the
lime, and the magnesia.
The writing of the book was started by the authors in 1923. Its
scope had been decided upon and the work was well under way before
the death of Dr. Hillebrand on February 7, 1925. In justice to Dr.
Hillebrand and to the reader it is fair to set forth the following ae-
count of the part which each of us has had in the completed work.
Of Parts I, II and V the junior author prepared and must bear
responsibility for all but approximately: (1) one-half of each of the
chapters on the alkalies, the alkaline earths, magnesium, rare earths,
titanium, precipitation by ammonium hydroxide, precipitation by the
basic acetate method, precipitation by the sueeinate method, precipi-
tation by ammonium sulphide, and ignition of precipitates; (2) one-
fourth of each of the chapters on zirconium, phosphorus, iron, alumi-
num, and earth acids; and (3) one-eighth of each of the chapters on
nickel, cobalt, manganese, zine, copper and molybdenum. Parts III
and IV of the book are taken in large measure from Dr. Hillebrand's
work on the Analysis of Silicate and Carbonate Rocks as published in
Bulletin 700 of the U. S. Geological Survey. The greater part of the
added chapter on fluxes was contributed by Dr. Hillebrand. The other
changes throughout Parts III and IV were made by the junior author.
The authors owe a special debt of gratitude to Dr. E. Wiehers, who
prepared the entire chapter' on the Platinum Metals and Gold, and to
Mr. H. B. Knowles, who made many careful tests of procedures that were
under consideration, Thanks are also due to Mr. J. I. Hoffman, Mr.
H. A. Bright and Mr. J. A. Scherrer, who assisted in a like manner.
G. E. F. LUNDELL.
Washington, D. C.,
January, 1929,