Bui. 1134, U. S. Dept. of Agriculture. 



Plate I 



a o3 



is 



£b 



o -as 



o E 

 - <e 



•42 « 



CO fc-o 



O o-g 



r„ "CO 



hi ^ 03 a 



- ^| 



I Hi I 



W "go3S & 



l , 



CO 



-I >, 

 fc is S3 



OC 'd 03 



-^ o 



> CO rH 







CO 



OC ■*- I— 



I Ms 



i 1*1 



g Si* 



.2 lo a 



Pi 

 '■is 1 



o 



