390 



BOARD OF AGRICULTURE. 



Moisture at 100° C , 

 Total phosphoric acid, . 

 Soluble phosphoric acid, 

 Revei'ted phosphoric acid. 

 Insoluble phosphoric acid, 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Valuation per two thousand pounds : — 



31. pounds of reverted phosphoric acid, 



15. G poxinds of insoluble phosphoric acid, . 



52.6 pounds of potassium oxide, . 



34 8 povmds of nitrogen, .... 



Per cent. 



6.40 

 2.33 



none. 



1.55 



.78 



2.63 



1.74 



64.07 



$2 32 



47 



2 24 



5 92 



$10 95 



Davis' Stiperphosphate and Animal Charcoal Fertilizer. 

 (Manufactured by Jane M. Davis, New Bedford, Mass.; collected at Factory.) 



Guaranteed composition; Total phosphoric acid, 14.97 

 per cent. ; reverted phosphoric acid, 10.61 per cent. ; insol- 

 uble phosphoric acid, 4.36 per cent. ; potassium oxide, 3.97 

 per cent. ; nitrogen, 2.39 per cent. ; sulphuric acid, 16.38 

 per cent. 



Moisture at 100*^ C, 

 Total phosphoric acid, . 

 Soluble phosphoric acid, 

 Reverted phosphoric acid. 

 Insoluble phosphoric acid. 

 Potassium oxide, . 

 Nitrogen, 

 Sulphuric acid. 

 Insoluble matter, . 



Valuation per two thousand pounds : — 



7 6 pounds of soluble phosphoric acid, 

 107.6 pounds of revei'ted phosphoric acid, 



81.2 pounds of insoluble phosphoric acid, 

 136.2 povmds of potassimn oxide, . 



60.6 poimds of nitrogen, 



Standard Superphosphate. 



Per cent. 



17.82 

 9.82 

 .38 

 5.38 

 4.06 

 6 81 

 3.03 

 6.18 

 8.44 



$0 61 

 8 07 

 2 44 

 5 79 



10 30 



627 21 



(Standard Fertilizer Company, Boston; collected of George A. Cobb, Acubbnet, 



Mass.) 



Guaranteed composition : Available phosphoric acid, 9 to 

 13 per cent. ; insoluble phosphoric acid, 2 to 3 per cent. ; 



