14 DAY USE 



RETURN TO DESK FROM WHICH BORROWED 



BIOLOGY LIBRARY 



TEL NO. 642.2531 



This book is due on the last date stamped below, or 



on the date to which renewed. 

 Renewed books are subject to immediate recall. 



DEC-l 1971 



LD 21A-15m-2,'69 

 (J6057slO)476 A-32 



General Library 



University of California 



Berkeley 



