





THIS BOOK IS DUE ON THE LAST DATE 

 STAMPED BELOW 



AN INITIAL FINE OF 25 CENTS 



WILL BE ASSESSED FOR FAILURE TO RETURN 

 THIS BOOK ON THE DATE DUE. THE PENALTY 

 WILL INCREASE TO SO CENTS ON THE FOURTH 

 DAY AND TO $1.OO ON THE SEVENTH DAY 

 OVERDUE. 



BIOLOGY LIBRARY 





itft 



folr23'6lLNl 



LD 21-10w-7.'39 (402s) 



