104 MISC. PUBLICATION 3 6 9, U. S. DEPT. OF AGRICULTURE 



s 5 



I CN »C i-H 



>co co ■* 



I OJ CO CN CO WOlOOIHH 

 liO i-l O O ^H 1-4 <N i-l i-l r* 



X uO C-J u- u- ic 



N N e c<; co » 



!3 & 



i>- cm co co cn ■- > 



I Tf< CN CO ~ ZC 



O b- CO 

 CN rH ^H 



<# co co iH ^h es 



■6WgW §■§■§ 



5 = s 



m d d 



S3 

 2 o 



OO 



£ o 



S.S '=« 



gSd-2 



H a. 



g J g g 



-co g 



ft 





? M 



i s 





p. ^3 cS be 

 -y c i- 





2SS 



£11 

 5ss 



^i 



PI&1U 



Z <S> =* • - T ft 



il'sIiH 



fl H Mm C8 g-H 



| • e g a cH e 48 "" 



/ 03 03 03 03 03 03 



i c 



is 



. w as 



- js w to cS 



e§cic?° 



£ 5.2.2 

 5 ^SS 



c3 <S CD CO 



MMMM 



r. C C 

 £ C3.S' 



i a « a «' 



I £S£°§ 

 c ^ M - M ! 

 > S > 5 P.2 



C 03 O » > r- 



: cs cx^r cx x si" « „ 





:^3 



- ■ 

 i' 



M M 



3 



_ c 8 o 8 n 



t£ O-P CU -4-3 CO 



M M M 



£ 3 

 ' O 



