Excerpt from Journal of the American Chemical Society, 1893, Vol. 15 When nitroglycerine was found to be present the dried pow der was first exhausted with ether in a Soxhlet extractor and the loss noted as nitroglycerine, though as shown later it some times included resins or oil which were present in slight pro portion. When the powder was readily attacked by water, as was the case with the American Wood and Brackett Powders, the aque ous treatment preceded that by ether-alcohol, and the salts were thus extracted together with the product Of the charring of the wood which is called humus in the tables. This humus was determined by evaporating the aqueous extract to con stant weight on the water bath, then treating with nitric acid repeatedly until oxidation ceased, again evaporating to dryness, and then fusing gently. To determine the aurin, which appears in several of the pow ders the sample was exhausted with chloroform in a Soxhlet ex tractor, and the residue in the tared flask weighed. The resi due was then taken up with a few drops of chloroform, trans ferred to a separating funnel, shaken with strong ammonia water, and separated. The chloroform solution was repeatedly washed with dilute ammonia until no pink color was developed in the water, then the chloroform solution was again evaporated in the tared flask and the weight of the residue determined. The dif ference in the two weights is the aurin. 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.