An. Rpt. Office of Experiment Stations, 1905. 



Plate VIII. 



> 



o 



c 

 r 



H 



c 

 > 



> 



r- 

 r 



Z 



o 



O 

 > 



X 



o 



r 



z 

 > 



O 



o 



f- 

 l- 

 m 

 O 



> 



O 



c 

 r- 

 H 

 C 

 X 



n 



> 



z 

 o 



m 

 o 



I 

 > 



z 

 o 



> 



3) 

 H 

 en 



