Excerpt from Testing for the Flotation Process To those who have contributed to the useful ness of this book, I express my extreme indebted ness. The work of O. C. Ralston and Glen L. Allen has been frequently referred to and the material of Chapter VI is largely taken from their invaluable article, Testing Ores for the Flotation Process. I am especially indebted to my wife who has made this compilation possible by her aid in preparing the manuscript. 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.