20 



BULLETIN 948, U. S. DEPARTMENT OF AGRICULTURE. 





s 



o 



~ 









o 



•< 



p 



2 



y. 



Sr 



<! 





hO 



09 



H 





< 



63 



1 



y< 



£ 





O 



*W 





u 



R 





s- 



c 





PQ 



"fti 



JHNB500 



?t CO CO CO CO CO 



CCDCOCOH 



=30100 coo© 



^ i>. a ^ « h 

 P©oc oo 



i2 Os co i-i co co 



T3^h — ,- o C-J 

 g CO CO CO coco 



ft< 



03-7! 

 02 ft 



B CD 



CO ft 



S3 



CO ft 



£2ft 



Jf-COCOCN'* 



- o o o ai o 



°J oo picric 



C N CO lO M 



CD — 



ill! 



to O CD 



■*05 



coco 



HHHCBO 



OOOOiO 



r-H ^-h CO ao >o 

 OJOOCSOJ 

 CN CO CO CM O) 



■ CO >C ■* 00 



■* CM CO 



-H O O 



CO CO CO 



S ft o O CD 9 



fecoO^O^ 



...2op3 



gcoOZfi 

 ft 



ft 



