Pelicans ISBN 0 14 02.1025 3 - Earth, Moon, and Planets

Penguin Books Ltd, Harmondsworth, Middlesex, England Penguin Books Australia Ltd, Ringwood, Victoria, Australia

First published by Harvard University Press 1941 Published by Pelican Books 1971 Copyright © The President and Fellows of Harvard College, 1941, 1963, 1968

Made and printed in Great Britain by Taylor Garnett Evans & Co. Ltd, Watford, Herts Set in Intertype Times

This book is sold subject to the condition that it shall not, by way of trade or otherwise, be lent, re-sold, hired out, or otherwise circulated without the publisher’s prior consent in any form of binding or cover other than that in which it is published and without a similar condition including this condition being imposed on the subsequent purchaser ::