Excerpt from Essays and Addresses In making a selection, it has been necessary to omit some valuable work, partly because it has been superseded by more modern research, and partly because the subject was of such a technical character that its appeal was merely to a limited class. It is hoped that the choice which has been made will be found to include all the detached essays and addresses of Dr. Campbell Brown, which still have general interest and merit reperusal at the present time. 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.