THE SUMMING UP. 



385 



VI. Forrester's Potato-Grower (New York City) . 



Repre- 

 sented. 



Moisture and organic matter, 

 Ash constituents, . 

 Total phosphoric acid, 

 Soluble " " . 



Insoluble " " . 



Nitrogen, 

 Potassium oxide, . 



5.07 



4.50 



.57 



2.06 



11.50 



48.70 

 51.30 

 5.06 

 4.40 

 0.66 

 2.08 

 9.55 



Valuation per ton, — 

 88.20 lbs. soluble phosphoric acid, 

 13.24 " insoluble " 

 41.60 " nitrogen, . 

 191.00 " potassium oxide, 



$14 33 



1 74 



12 48 



15 28 



$43 45 



111 comparing the preceding analytical results with the com- 

 positions guaranteed by the manufacturers, we have to admit 

 that they agree pretty well. The samples tested are all, with 

 but one exception, of the usual low grade of our home-made 

 ammoniated superphosphates. Many of them sell at a much 

 higher price in the retail trade than a very liberal valuation of 

 their essential constituents seems to warrant ; a circumstance 



49 



