48 THE CONNECTICUT AGRICULTURAL 



1888. 



„„„,„ _. . Estimated value per pound, 



urade. Dimensions. Nitrogen. Phos. Acid. 



Fine, smaller than one -b^q inch. 17 cts. 6 cts. 



Fine medium, between jV and -/^ inch, 15 " 5^ " 



Medium, '• -/g- and -jV inch, 14 " 5 " 



Coarse medium. " -ig- and -J inch, 13 " 4| " 



Coarse, larger than ^ inch, 11 " 4 " 



The chemical and mechanical analysis of a sample of ground 

 bone being before us, we separately compvite the nitrogen value 

 of each grade of bone which the sample contains, by multiplying 

 the pounds of nitrogen per ton in the sample by the per cent, of 

 each grade, taking y^th of that product, multiplying it by the 

 estimated value per pound of nitrogen in that grade, and taking 

 this final product as the result in cents. Summing up the sepa- 

 rate values of each grade, thus obtained, together with the values 

 of each grade for phosphoric acid, similarly computed, the total 

 is the estimated value of the sample of bone. 



To illustrate, Rogers and Hubbard's Raw Knuckle Bone, A, 

 Extra fine, No. 860, contains 3.92 per cent, of nitrogen or 78.4 

 lbs. per ton, and 23.61 per cent, of phosphoric acid or 472.2 lbs. 

 per ton. The mechanical analysis showed : 



Fine, :... 35 per cei»t. 



Fine medium, 33 



Medium, 24 



Coarse medium, 8 



Coarse, 



100 



The calculations are as follows : 



78.4 X 35 -^ 100 X 17 = |4.67 

 78.4 X 33 -=- 100 X 15 = 3.88 

 78.4 X 24 ^ 100 X 14 = 2.63 

 78.4 X 8 -^ 100 X 13 = .82 



Estimated value of nitrogen, $12.00 



472.2 X 35 -4- 100 X 6 = |9.92 



472.2 X 33 -H 100 X 5f = 8.57 



472.2 X 24 -f- 100 X 5 = 5.67 



472.2 X 8 -^ 100 X 4| = 1,70 



Estimated value of phosphoric acid, $25.86 



$37.86 



