16 



BULLETIN &88, U. S. DEPT. OF AGRICULTURE. 



9 



f 



h 



-r 



<0 













s\ 





2 



> / 









t 

























































\ 





























\ 

























































' 





































































































ly) 















) 

















/ N 

























t 



KsJ" 











































\ 















'-// 































5! 



V 











\ 













~3 

















) 



















K 











< 









































s 

















/ 















S>- 































N 































10 

























\\ 



























N ^ 

















\ 















is 



































( 









1 













































Js 























































N^ 















/ 



























I 

























































I 





























\ 































i 













































2 



1 V" 



l;> 









I s 



































