E-text prepared by Peter Yearsley, Josephine Paolucci, and the Project Gutenberg Online Distributed Proofreading Team (https://www.pgdp.net/) Note: Project Gutenberg also has an HTML version of this file which includes the original illustrations and in which the chemical equations are easier to read. See 18751-h.htm or 18751-h.zip: (https://www.gutenberg.org/dirs/1/8/7/5/18751/18751-h/18751-h.htm) or (https://www.gutenberg.org/dirs/1/8/7/5/18751/18751-h.zip) Transcriber's Note: Text: Words surrounded by a tilde such as ~this~ means the word is in bold face. Words surrounded by underscores like _this_ means the word is in italics in the text. Letters in brackets with an = sign before it means that the letters have a macron over them, e.g. H[=A=c] signifies that the Ac has a macron over it. Numbers and equations: Parentheses have been added to clarify fractions. Underscores before bracketed numbers in equations denote a subscript. Superscripts are designated with a caret and brackets, e.g. 11.1^{3} is 11.1 to the third power. The symbol .'. designates the symbol usually used for therefore (three periods in a triangle shape). A down arrow is represented by a vertical line over a capital V. Like this: | V Minor typographical errors have been corrected. Footnotes have been moved to the end of the chapter, and all advertisements have been moved to the end of the book. A TEXT-BOOK OF ASSAYING: FOR THE USE OF THOSE CONNECTED WITH MINES. by C. AND J. J. BERINGER. Revised by J. J. BERINGER, Assoc. of the Royal School of Mines; Fellow of the Chemical Society and of the Inst. of Chemistry; Principal of the Camborne Mining School; and Late Public Analyst for the County of Cornwall. With numerous Diagrams and Tables. Ninth Edition. London: Charles Griffin and Company, Limited, Exeter Street, Strand. 1904. [All rights reserved.] PUBLISHER'S NOTE TO THE NINTH EDITION The continued popularity of the present work, the last edition of which was published only a little over a year ago, continues to be a source of gratification to the publishers, who have much pleasure in issuing the present edition. _January 1904._ PREFACE TO THE SIXTH EDITION The principal changes in this edition are additions to the articles on Gold, Cyanides, and Nickel, and a much enlarged Index. The additional matter covers more than forty pages. J. J. BERINGER. CAMBORNE, _January 1900._ PREFACE. The Text-book now offered to the public has been prepared to meet the existing want of a practical "handy book" for the Assayer.