Book excerpt: Excerpt from Philosophical Magazine and Journal of Science, Vol. 27: New and United Series of the Philosophical Magazine, Annals of Philosophy, and Journal of Science, July-December, 1845 The oxide of cobalt procured by burning the metal cobalt on charcoal by a jet of oxygen was obtained as a fused glo bule and was not magnetic. 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.