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Excerpt from A Manual of Seismology My chief difficulty in writing this textbook has been to decide on what should be included and what excluded, to determine in fact the relative importance of different branches of a subject which is of growth so modern that its treatment has not yet become defined. Until near the close of the last century, seismology was regarded as a department of geology, but, while its growth in that direction has by no means ceased, the more recent advances have been largely the work of mathematicians and physicists. As this volume belongs to a series of geological manuals, much of that work is here left unnoticed, and readers who wish to known more of these recent developments may be referred to Prof. Knott's Physics of Earthquake Phenomena (Oxford University Press) and Dr G. W. Walker's Modern Seismology (Longmans). Partly in order to save room, I have omitted several subjects which are usually included within the domain of seismology. Some of these (such as the bending of the earth's crust by tidal loading and the occurrence of man micro-tremors) have in reality no connexion with earthquakes. Others (such as the effects of earthquakes on men and animals, the rotation of columns and experiments on the velocity of earth-waves) are of interest but are not essential to the subject. Though a few historical notes are inserted here and there, no attempt is made to provide a history of seismology. My aim has been to give an outline of our present knowledge, which of course is usually in advance of the work of pioneers. The number of references to any writer in the index is thus rather a testimony to the recency of his achievements than to the actual part which he has taken in promoting the science. Otherwise, there would have been many more references to the work of Perrey, Mallet and Milne. Readers who desire further information on the history of the science may consult a series of papers on the Founders of Seismology in the Geological Magazine for 1921. 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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