Excerpt from The Testing of Chemical Reagents for Purity The necessity of obtaining the highest degree of purity in those reagents which are most largely used in chemical analysis and research, demands a means of speedily recognizing the impurities most often encountered. This means of recognition, together with much general information regarding the various reagents, is afforded in a very comprehensive form by Dr. Krauchs' valuable work, which we present for the first time in English, the translation being that of the third German edition. We have practically adhered to the general arrangement and treatment adopted by the author. We would particularly call the attention of the reader to the fact that, in most instances, reference has been made to English abstracts from the original communications. We have also endeavoured to enhance the value of the book by substituting for the numerous references to German text books on chemical analysis the corresponding English works. We have to acknowledge the valuable aid given by the author himself in supplying us with additions and corrections, the result of his experience since the third German edition was published. The Latin titles of the reagents are those of the Pharmacop a Germanica and have been retained, as they may be of service for the recognition of certain chemicals in price lists. In conducting the various tests, the author emphasises rigid adherence to the degree of concentration, the amount of reagent used and the manner in which the test is to be carried out. Temperatures are, in all cases, given in degrees Centigrade. Finally, our thanks are due to those friends who have assisted us in revising the proofs of this translation. 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."

Excerpt from Chemical Reagents, Their Purity and Tests: A New and Improved d104 Based on and Replacing the Latest Edition of Krauch's "Die Prufung Der Chemischen Reagentien Auf Reinheit" As long ago as the early seventies I felt the need of a treatise on Chemical Reagents, and thought of compiling such a work. I was then an assistant in the chemical laboratory of the Government Agricultural Experiment Station at Munster, and in my chemical work there met with constant difficulties on account of the great variations in the chemicals which were graded as "C. P." "puriss," etc. It was my aim to fix uniform standards for such chemicals as are used in analytical work, such standards to define closely the degree of purity of the chemicals and yet to be possible of attainment in practice by the manufacturer. Not until 1888, however, did my work in this direction take the tangible form of a book, "Die Pruefung der Chemischen Reagentien auf Reinheit." A second revised and enlarged edition was published in 1891. In 1896 a third edition, carefully revised and still further enlarged, was published. Since that time a good many changes have taken place, so that my book again needed revision. As I was unable to undertake this work, Mr. E. Merck, appreciating the usefulness of such a work as mine, published in 1905 what might be considered its up-to-date revision. It is a source of gratification to me to see this work translated and placed before my colleagues across the sea. Such changes and additions as the translator has made in order to adapt the book to their particular needs, have my approval. 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."

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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

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Excerpt from Uses, Tests for Purity and Preparation of Chemical Reagents: Employed in Qualitative, Quantitative, Volumetric, Docimastic, Microscopic and Petrographic Analysis, With a Supplement on the Use of the Spectroscope 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.