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Excerpt from Revised and Enlarged Manual of the Active Principles of Indigenous and Foreign Medicinal Plants Repeated analyses have demonstrated the fact that speci mens of the same pla.\t, grown in different localities, will vary infinitely in the proportions of active principles yielded. Indeed many specimens analysed have been found entirely destitute of any perfected medicinal principles whatever. Th'us physicians of one section will laud the remedial virtues of a particular plant, while others, in a different locality, will be unable to discover any medicinal value whatever in the disputed article. This discrepancy may be dependent upon any of the before mentioned causes. 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.