Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide, 

 Nitrogen, 

 Calcium oxide, 

 Sulphuric acid, 

 Chlorine, 

 Carbonic acid, 



1916-1920. I. Received from Bridgewater, Mass. 



II. Received from Southwick, Mass. 



III. Received from Oxford, Mass. 



IV. Received from Deerfield, Mass. 

 V. Received from Aeawam, Mass. 



Moisture at 100° C, 

 Total phosphoric acid, 

 Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide. 

 Nitrogen, 



1921-1924. I. Received from Worcester, Mass. 



II. Received from Seekonk, Mass. 



III. Received from Southwick, Mass. 



IV. Received from Holyoke, Mass. 



* Not determined. 



