Bui. 974, U. S. Dept. of Agriculture. 



Plate XXII. 



^ ^ ^ « W 



.3 -w .q 5 • !2 



o 5 i 



2 SS^S-S'g 



cs cs H to a+s 



fcgS»3S-43 



■a O £^ ".^03 



S o 2 g as. 

 g .^-oS 



_r^ S 03 „ 3 

 2 ® ox: te 



u. a2«Sg<= 



PI c3^ g-*^ o 



§oias2 



§£fe^^^ 



"3 g i 



_h£ ^.^,5^ bjc^ 



£^£5-la 



m C3 O 03 P.O 



feora-sS-i^ 



(C <3 P S , M 

 m -d c3 d'r' 



■g^a^-al^ 



-C ^-1 O c8 3 



g«2<?-a« 



