Transcriber’s Note:

The cover image was created by the transcriber and is placed in the public domain.

MENTAL RADIO

MARY CRAIG SINCLAIR

1883–1961

(Revised Second Printing)

MENTAL RADIO

UPTON SINCLAIR

Introduction by

WILLIAM McDOUGALL

Preface by

ALBERT EINSTEIN

With a Report by

WALTER FRANKLIN PRINCE

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. Nopart of it may be reproduced in any mannerwithout written permission from the publisher.

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Printed in the United States of America

INTRODUCTION

Mr. Upton Sinclair needs no introduction to the public asa fearless, honest, and critical student of public affairs. But in thepresent book he has with characteristic courage entered a new field,one in which reputations are more easily lost than made, the fieldof Psychic Research. When he does me the honor to ask me to writea few words of introduction to this book, a refusal would imply onmy part a lack either of courage or of due sense of scientific responsibility.I have long been keenly interested in this field; and it isnot necessary to hold that the researches of the past fifty years havebrought any solidly established conclusions in order to feel surethat further research is very much worth while. Even if the resultsof such research should in the end prove wholly negative that wouldbe a result of no small importance; for from many

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MENTAL RADIO

INTRODUCTION

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