Bui. 121, Forest Service, U. S. Dept. of Agriculture. 



PLATE XII. 



Z T3 



* 



O -S 

 < 



> | 



j iai 



CO ^ "*""* ^ 



z "~ 



CO r-.rj 



_i gT: 



< 3o 



I "*" 



tr t S- 



< ^ Bs 



"JQ c 2 



>nr r ~' G 



, ^~ 



LJ m w 60 



UJ 3 G 



co ^ e o 



o I ** I 



_l C 2= 



9^ II 



^^ - 



! 1 



I be 



OJ | 



S2 | 



L. S 



Si 



Q |_ 



f ^ 



3! ^ 



9S I 



< M c 



111 "* 



> uT 2 

 i? S 



^ > 



dLi- id 



_ O 03 



LL 



