11 



Moisture at 100° C, 

 Total Phosphoric acid, 

 Potassium oxide, 

 Calcium oxide. 

 Nitrogen, 

 Insoluble matter. 

 Magnesium oxide, 

 Ferric^oxide, 

 Aluminum oxide. 

 Sulphuric acid. 

 Chlorine, 

 Carbonic acid, 



The character of this material depends, in a controlling degree 

 upon the process of precipitation. 



*Not determined. 



