Excerpt from Applied Chemistry: An Elementary d104 Book for Secondary Schools The author is not very sure but that the preface of any book is a useless page. It is doubtful whether a sufficient number ever read this personal letter of the author to pay him for the writing or the publisher for printing it. Yet every writer by force of custom feels compelled to address his readers by a foreword. 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.