Excerpt from Space and Time, in Contemporary Physics, an Introduction to the Theory of Gravitation The present edition varies from the previous one only in small additions and other slight improvements. I have endeavoured to meet the wishes which observant readers have expressed to me personally or in writing. I hope that the book will w somewhat better fulfil its good purpose of leading as far as possible into the wonderful thought world of the theory of relativity. Among those to whom I am indebted for suggestions, I wish to express my special thanks to Professor E. Cohn, of Strassburg (w at Ros tock). Moritz schlick. 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 techlogy 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.