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Excerpt from The American Journal of Pharmacy, Vol. 18: Published by Authority of the Philadelphia College of Pharmacy; January, 1852 NO scale formed from experiments can be depended upon for accuracy, as a proof of which it is impossible to find two scales so formed agreeing, the error Often affecting the first decimal place. 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.