Book excerpt: Excerpt from The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Vol. 36: New and United Series of the Philosophical Magazine, Annals of Philosophy, and Journal of Science; January June, 1850 It may be observed too that is little, if any, inferior to in point of easy application, as it requires a reference to one table only, while requires a reference to two. 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.