16 



On Agricultural Chemistry. 



CO 

 I CO 



O c 

 f-c o ,c 



GO — 



cj as 



^ CO 



4, o 



•■^« CO CI '-' o 



00 05 00 -^tl CO >— ' 



— CO 



o3 

 o 



^ r-l — . 



CO i 



»^ ! CI 



00 ! ^ 



CO --t CO .— I 



5 ^ 

 •o r; »fj ; 











to 









»0 



'5 



o n3 o 



. ° S "5 S ■= 



^ S 2 g 2 



ni o 

 '= S'5 



C ._. 4, O) O 



O OJ o 



Ml o I — I 



C/3 



