Bui. 34, Bureau of Forestry, U. S. Dept. of Agriculture. 



Plate XV. 



5 

 < 



m 



O 



< 



m 

 n 



CO 



m 

 m 

 32 



z 

 a 



-\ 

 m 



z 



H 

 CO 



> 



z 

 o 



"0 



o 



3) 



H 

 > 



CD 



O 



o 

 o 



?; 

 CO 



I 

 > 



z 



