The diagnosis of a disease stands at the very threshold of our inquiries concerning it. In some cases we can recognize the affection at once. Its features are so clearly portrayed, that a glance suffices to reveal its nature, and even its stage of development, to those acquainted with the progress of such maladies. This, however, is far from being a usual circum stance. A long and attentive investigation, and a careful balancing of facts, is more commonly requisite in order to learn the truth. 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.