BERNICE KOHN
illustrated by
ZENOWIJ ONYSHKEWYCH
PRENTICE-HALL. INC.
ENGLEWOOD CLIFFS. NEW JERSEY
OTHER PRENTICE-HALL BOOKS BY THE SAME AUTHOR:
Our Tiny Servants: Molds and Yeasts
illustrated by John Kaufmann
Computers at Your Service
illustrated by Aliki
The Peaceful Atom, by Bernice Kohn
Copyright under International Pan-American copyright conventions
©1963 by Bernice Kohn
All rights reserved, including the right to reproduce this book, or any portions thereof, in any form except for the inclusion of brief quotations in a review.
Library of Congress Catalog Card Number: 63-9054
Printed in the United States of America 65524-T