FRIEDRICH WÖHLER, PROFESSOR OF CHEMISTRY IN THE UNIVERSITY OF GÖTTINGEN. EDITED BY HENRY B. NASON, PROFESSOR OF CHEMISTRY IN THE RENSSELAER POLYTECHNIC INSTITUTE, PHILADELPHIA: HENRY CAREY BAIRD, INDUSTRIAL PUBLISHER, 406 Walnut Street. Entered according to Act of Congress, in the year 1870, by HENRY CAREY BAIRD, in the Office of the Librarian of Congress. All rights reserved. PHILADELPHIA: COLLINS, PRINTER, 705 JAYNE STREET. PREFACE TO THE AMERICAN EDITION. The present edition of WÖHLER'S HAND-BOOK OF MINERAL ANALYSIS is a translation of the last German with some changes and additions. A few of the methods here described might have been omitted, and newer, in some cases preferable ones, given instead, but it has been thought advisable to present the book in nearly the same form as the original. Free use has been made of the excellent translation of the first edition by Dr. A. W. Hoffman, and frequent reference had to the French edition by Messrs. Grandeau and Troost, from which many of the illustrations of apparatus have been taken. The work is not intended to take the place of larger and more complete works on analysis, but it is believed that it will be found a convenient companion to these in the laboratory. TROY, N. Y., Dec. 15, 1870. H. B. N. |