Author: Karl Dieterich

Publisher: Forgotten Books

Published: 2017-03-24

Total Pages: 452

ISBN-13: 9781331884675

Excerpt from Analysis of Resins, Balsams and Gum-Resins: Their Chemistry and Pharmacognosis for the Use of the Scientific and Technical Research Chemist With a Bibliography It may be stated without fear of contradiction that the analytical data hitherto published dealing with the many resinous substances are far from being as uniform, accurate, and reliable as in the case of such bodies, for example, as the fats and oils. Even though the rosins arc, speaking from a chemical point of view, in no way very similar, or nearly allied, to the definitely characterised fats, the great variations in the analytical values obtained are nevertheless remarkable, since the methods of examination have, in both cases, almost without exception, been the same. Although, owing to the crude methods of preparation and diverse commercial usages, the constitution of the resinous substances - by which name the author implies the true resins, balsams, and gum resins - as inconstant, alterable mixtures of amorphous and, for the most part, unknown bodies, is such that no complete concordance of analytical values could be expected, it becomes an interesting, and indeed inevitable, problem to ascertain what arc the causes of this lack of concordance; and an additional question also arises, namely, from what points of view should the matter be approached in future with the idea of improving the analytical methods, and thereby securing greater uniformity in the results already obtained? 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.