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Excerpt from A Textbook of Geology, Vol. 1: Physical Geology With this keynote in mind, the attempt is made throughout the book to keep to matters that have a direct bearing on geologic history. The authors consider it a mistake to use the limited space in an ele mentary text for the exposition of scientific matters not directly a part of geology, however interesting they may be in themselves. For this reason the discussion of weather, of which at best only a smattering can be given in a geologic text, has been abandoned. Similarly a detailed discussion of the mechanics of glacier motion, which has inherent inter est but is not essential to an understanding of land sculpture by glaciers, is dispensed with. 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.