210 



BOARD OF AGRICULTURE. 



Valuation per two thousand pounds : — 



111.2 pounds of soluble phosphoric acid, 

 19.4 pounds of reverted phosphoric acid, 

 35.8 pounds of insoluble phosphoric acid, 



113. pounds of potassium oxide, . 

 83.2 pounds of nitrogen (in organic matter), 

 38. pounds of nitrogen (in nitrates), . 



$47 47 



Sparrow'^s Grass Fertilizer. 

 (Judson and Sparrow; collected of Everett and Gleason, Boston, Mass.) 



Guaranteed composition : soluble and reverted phos- 

 phoric acid (available), 8 to 9 per cent. ; potassium oxide, 

 4 to 5 per cent. ; ammonia, 5 to 6 per cent, (equivalent to 

 nitrogen, 4.1 to 4.9 per cent.). 



Valuation per two thousand pounds : - 



149. pounds of soluble phosphoric acid, 

 21.8 pounds of reverted phosphoric acid, 

 21.2 pounds oi insoluble phosphoric acid, 

 85.6 pounds of potassium oxide, . 

 94.6 pounds of nitrogen. 



$16 39 



1 74 



1 27 



3 64 



21 76 



$44 80 

 Stajidard Siqjerphosphate. 

 (Standai'd Fertilize Co., Boston; collected of Whittemore Bros., Boston.) 



Guaranteed composition : soluble and reverted phosphoric 

 acid (available), 9 to 13 per cent.; insoluble phosphoric 

 acid, 2 to 4 per cent. ; magnesium oxide, 1.5 to 2 per cent. ; 

 potassium oxide, 2 to 4 per cent. ; ammonia, 2 to 4 per 

 cent, (equivalent to nitrogen, 1.6 to 3.3 per cent.). 



Per cent. 



Moisture at 100° C, . . 18 35 



Total phosphoric acid, ....... 10.22 



