Excerpt from Losses in Gold Amalgamation: With Notes on the Concentration of Gold and Silver Ores The variety of modifications in approved pro cesses to which reference is made, ought at least to suggest the desirability of exhausting the known before drawing on the unknown and purely specu lative. It should also be borne in mind, that what might appear at first sight to be new processes, and even new machinery, are in fact, often nothing but Old contrivances and plausible theories long ago exploded among practical men. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.