Treatise on Ore Deposits, BERNHARD YON COTTA, PROFESSOR OF GEOLOGY IN THE ROYAL SCHOOL OF MINES, FREIBERG, SAXONY. TRANSLATED FROM THE SECOND GERMAN EDITION, FREDERICK PRIME, Jr., MINING ENGINEER. REVISED BY THE AUTHOR. WITH NUMEROUS ILLUSTRATIONS. NEW YORK: D. VAN NOSTRAND, PUBLISHER, 23 Murray Street and 27 Warren Street. 18 70.