THE STOCKBRIDGE FERTILIZERS. 



343 



Total phosphoric acid 

 Phosphoric acid soluble in water 

 Reverted phosphoric acid . 

 Insoluble phosphoric acid 

 Potassium oxide 

 Insoluble matter, sand, &c. 



Valuation per ton of two thousand pounds : — 



158.4 pounds of nitrogen .... 



28.6 pounds of soluble phosphoric acid . 

 3 pounds of reverted phosphoric acid . 



15.6 poimds of insoluble phosphoric acid 

 160.6 pounds of potassium oxide 



XV. 



Slockhridge Manures; Tobacco. 

 (H. C. Comins, Northampton, Mass.) 



Moisture lost at 100° C 



Total nitrogen 



Total phosphoric acid .... 

 Phosphoric acid soluble in water 

 Insoluble phosphoric acid 

 Potassium oxide 



Per cent. 



2.36 



1.43 



.15 



.78 



8.03 



.68 



Magnesium oxide 



Calcium oxide . 



Insoluble matter, sand, &c. 



$43 70 



Per cent. 

 8.75 

 6.65 

 2.55 



■ 1.88 



.67 



9.36 



.67 



7.10 



1.52 



Valuation per ton of two thousand pounds : — 



133 pounds of nitrogen (f is actual ammonia) . $29 92 



37.6 pounds of soluble phosphoric acid . . . 4 70 



13.4 pounds of insoluble phosphoric acid . . 80 



187.2 pounds of potassium oxide . . . . 14 04 



$49 46 

 XVI. 



W. H. Bowker^s Hill and Drill Phosphate. 



(H. C. Comins, Northampton, Mass.) 



Per cent. 



Organic and volatUe matter 66.81 



Ash constituents 33.19 



Moisture lost at 100° C 19.70 



Total nitrogen ....... 3.22 



Total phosphoric acid . . . . . .10.62 



Phosphoric acid soluble in water . . . .8.47 



Reverted phosphoric acid 1.41 



Insoluble phosphoric acid 74 



Insoluble matter, sand, &c 1.99 



