360 



BOARD OF AGRICULTURE. 



Valuation per two thousand pounds : — 



144. pounds of soluble phosphoric acid, 

 52. pounds of reverted phosphoric acid, 

 42.2 pounds of insoluble lihosphoric acid, 

 22.4 pounds of potassium oxide, . 

 50.8 pounds of nitrogen, 



$11 52 

 3 90 

 1 27 

 1 23 

 8 64 



$26 56 

 Zee, Blackburn & Co.'s Potato Fertilizer. 

 (Collected of Scott & Victor, Lawrence, Mass.) 



Guaranteed composition : Total phosphoric acid, 8 to 10 

 per cent. ; potassium oxide, 6 to 7 per cent. ; ammonia, 4 

 to 5 per cent, (equivalent to nitrogen, 3.3 to 4.1 per cent.) 



Moisture at 100° C , 

 Total phosphoric acid, . 

 Soluble phosphoric acid. 

 Reverted jDhosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide, . 

 Nitrogen, 

 Insoluble matter, . 



Per cent. 



19.80 



12.55 



10.81 



1.52 



.22 



3.05 



2.63 



.83 



Valuation per two thousand pounds : 



216.2 pounds of soluble phosphoric acid, 

 30.4 pounds of reverted phosphoric acid, 

 4.4 pounds of insoluble phosphoric acid, 

 61. pounds of potassium oxide, . 

 52.6 pounds of nitrogen. 



$17 

 2 



30 



28 



13 



2 59 



8 94 



$31 24 

 Lawrence Fertilizer. 



(Lee, Blackburn & Co., Lawrence, Mass. ; collected of Scott & Vietor, Lawrence, 



Mass.) 



Guaranteed composition : Total phosphoric acid, 12 to 14 

 per cent. ; potassium oxide, 2 to 3 per cent. ; nitrogen, 2 to 

 3 per cent, (equivalent to ammonia, 3 to 4 per cent.). 



Moisture at 100° C, 

 Total phosj^horic acid, . 

 Soluble phosphoric acid. 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide, . 

 Niti-ogen, 

 Insoluble matter, . 



Per cent. 



18.20 



13.61 



11.58 



1.87 



.16 



2.32 



2.46 



1.30 



