Excerpt from Technical Book Review Index, Vol. 4: Issued by the Technology Department of the Carnegie Library of Pittsburgh; March 1920 Each quotation immediately follows the name of the journal from which it is taken. Obviously these brief extracts, thus detached from the context, must not be accepted as conclusive. Very often a review is so equivocal that there can be no unanimity of opinion as to whether it is favorable or unfavorable. For this reason no estimate is given here. Except for this one omission, this index is an exact copy of cards filed in the book review index of the Carnegie Library of Pittsburgh. 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.