Excerpt from The Dublin Journal of Medical Science, Vol. 93: Containing Original Communications, Reviews, Abstracts, and Reports in Medicine, Surgery, and Collateral Sciences; January, 1892 Edwin lapper, Member of the King and Queen's College of Physicians in Ireland; Fellow of the Institute of Chemistry of Great Britain Member of the Society of Analysts; Lecturer on Chemistry; Professor of Chemistry, Royal College of Surgeons, Ireland. 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.