Excerpt from Manual of Chemical Physiology N 0 apology is necessary in presenting to the American medical public the work of one so widely known and universally acknow ledged as an authority as Professor Lehmann. In so doing, how ever, I am surrounded with more than ordinary difficulties. A correct English translation of a German work is no easy task; but when the original is not a full discussion of the subject considered, but as compressed a statement of facts as is compatible with clear ness, the difficulty of avoiding idiomatic expressions is greatly in creased. From Dr. Lehmann's views of the forces operative in living organisms, I must express my dissent. Dr. Jackson has been kind enough, at my request, to prepare an article on these views, stating the doctrines which he has so ably advocated for many years. 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.