CONFORMITY TO (U ARANTEE 



The chemical analyses were made by the methods of the Association of 

 Official Ag:iicultural Chemists. Forty-six of the 82 brands analyzed equaled or 

 exceeded the manufacturers' guarantees. Two brands failed to meet the guarantee 

 in all of the three constituents, total nitrogen, available phosphoric acid, and 

 water-soluble potash. Eleven brands were below guarantee in two of the three 

 constituents. Twenty-thi-ee brands failed to meet the guarantee in only one 

 constituent. Three brands were guaranteed to contain magnesium oxide. None 

 failed to meet the guarantee. 



In the tabulation of the analyses in the following pages deficiencies of one- 

 half per cent oi- more aie shown in red bold-face type. The manufacturers are 

 arranged alphabetically. The brand name is listed alphabetically, or numerically 

 by formula, under the manufacturer. 



