1 , j Agricultural Chemistry. 



phoric acid guaranteed. The following example, taken from the 

 label of a fertilizer bag, will explain this point more fully : 



GENERAL CROP BRAND. 



Guaranteed Analysis. 



Nitrogen . 82 1 . 65 per cent 



Ammonia 1.0 2.0 



Available Phosphoric Acid K.O 10.0 " 



Equal Bone Phosphate 17.0 21 .0 



Total Phosphoric Acid 10.0 12.0 



Potash Sulphate 11.0 13.0 



Potash (U) 7.0 



Color not guaranteed. 



The buyer is only concerned in the total amount of nitrogen, 

 available phosphoric acid and potash that the brand contains, 

 and these figures alone should dictate the actual worth of the 

 material. 



