This book is in the 



ADDISON-WESLEY 



SERIES IN 



THE LIFE SCIENCES 



Consulting Editors: 



EDWARD HERBERT 



Massachusetts Institute of Technology 



HERMAN LEWIS 



National Science Foundation 



Copyright © 1963 



ADDISON-WESLEY PUBLISHING COMPANY, INC. 



Printed in the United States of America 



All rights reserved. This book, or parts thereof, 

 may not be reproduced in any form 

 without written permission of the publisher. 



Library of Congress Catalog No. 63— 1 6566 



For Becky, Karen, Erika and David 



