Acer Spicatum contains a substance which gives a crimson color with ammonia, and which may be similar to the emo dins of the common cathartic drugs. It also contains a substance which gives a blue color with ferrous sulphate solution similar to that obtained from rhubarb. 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.