MENTAL RADIO [Illustration: MARY CRAIG SINCLAIR 1883–1961 ] (_Revised Second Printing_) MENTAL RADIO _By_ UPTON SINCLAIR _Introduction by_ WILLIAM McDOUGALL _Preface by_ ALBERT EINSTEIN _With a Report by_ WALTER FRANKLIN PRINCE [Illustration] CHARLES C THOMAS · PUBLISHER _Springfield · Illinois · U.S.A_ CHARLES C THOMAS · PUBLISHER BANNERSTONE HOUSE 301–327 East Lawrence Avenue, Springfield, Illinois, U.S.A. This book is protected by copyright. No part of it may be reproduced in any manner without written permission from the publisher. © _1930 and 1962, by_ CHARLES C THOMAS · PUBLISHER Library of Congress Catalog Card Number: 62–12057 _With THOMAS BOOKS careful attention is given to all details of manufacturing and design. It is the Publisher’s desire to present books that are satisfactory as to their physical qualities and artistic possibilities and appropriate for their particular use. THOMAS BOOKS will be true to those laws of quality that assure a good name and good will._ _Printed in the United States of America_ ------------------------------------------------------------------------ INTRODUCTION