Excerpt from The Journal of the Chemical, Metallurgical and Mining Society of South Africa, Vol. 20: July, 1919 June, 1920 A subsequent paper will deal with the allied subject of the solubility of zinc, but attention is here called to the remarkable fact that though zinc easily replaces the gold from aurocyanide solutions yet the rate of solution of gold by cyanide solution is five to six times as rapid as that of zinc. Maclaurin found the relative rates of solu tion of gold and silver to be proportional to their atomic weights, and the same is true for zinc if relative equivalents be sub stituted. 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.