[Transcriber Note: Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.]

A BERKLEY MEDALLION BOOK
published by
THE BERKLEY PUBLISHING CORPORATION

COPYRIGHT © 1961, BY MURRAY LEINSTER

Published by arrangement with the author

BERKLEY EDITION, AUGUST, 1961

BERKLEY MEDALLION BOOKS are published by
Berkley Publishing Corporation
101 Fifth Avenue, New York 3, N. Y.

Printed in the United States of America