532 BOAED OF AGEICULTURE. 



Williams, Clark & Co.'s ^^Amencus" Ammoniated Bone Super- 

 phosphate. 

 (Collected of J. A. Brewer, Great Barrlngton, Mass.) 



Guaranteed composition : Total phosphoric acid, 11 to 16 

 per cent. ; soluble phosphoric acid, 8 to 9 per cent. ; re- 

 verted phosphoric acid, 2 to 3 per cent. ; potassium oxide, 



2 to 3 per cent, (equivalent to potassium sulphate, 4 to 6 

 per cent.) ; nitrogen, 2 to 3 per cent, (equivalent to am- 

 monia, 3 to 4 per cent.) ; magnesium sulphate, 3 to 4 per 

 cent. 



Per cent. 



Moisture at 100^ C, 14.11 



Total phosphoric acid, 10.60 



Soluble phosphoric acid, 8.60 



Reverted phosphoric acid, 2.00 



Insoluble phosphoric acid, none. 



Potassium oxide, 2.32 



Nitrogen, 3.20 



Insoluble matter, 3.48 



Valuation per two thousand pounds : — 



172.0 pounds of soluble phosphoric acid, . . . $13 76 



40.0 pounds of reverted phosphoric acid, . . . 3 00 



46.4 pounds of potassium oxide, 2 55 



64.0 pounds of nitrogen, 11 20 



$30 51 



H. Preston & Son's Ammoniated Bone Superphosphate. 

 (Collected of W. M. Wood, Pittsfield, Mass.) 



Guaranteed composition: Available phosphoric acid, 9 to 

 10 per cent. ; potassium oxide, 2 to 3 per cent. ; ammonia, 



3 to 4 per cent, (equivalent to nitrogen, 2.5 to 3.3 pet 

 cent.). 



Per cent. 



Moisture at 100° C, 14.28 



Total phosphoric acid, . 10.88 



Soluble phosj^horic acid, 6.86 



Reverted phosphoric acid, 1.75 



Insoluble phosphoric acid, . . . . . . 2.27 



Potassiiim oxide, 3.31 



Nitrogen, 2.62 



Insoluble matter, 3.26 



