Excerpt from Geophysical Abstracts 151, October-December 1952: Numbers 14004-14183 Geophysical Abstracts are issued quarterly by the Geological Sur vey, U. S. Department of the Interior, to aid those engaged in geo physical research and exploration by providing informative abstracts of current literature dealing with geophysical exploration and the physics of the solid earth. 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.