14 DAY USE 





RETURN TO D] 



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



on the date to which renewed. 

 Renewed books are subject to immediate recall. 



AUQtoWNBW 



2$ 

 Iff* ' 



BIOLOGY LIBRARY 



LD 21-100m-6,'56 

 (B9311slO)476 



