8 The Bulletin. 



In Mixed Fertilizers. 



For available phosphoric acid 41/2 cents per pound. 



For nitrogen 191/2 cents per pound. 



For potash 51/2 cents per pound. 



HOW RELATIVE VALUE IS CALCULATED. 



In the calculation of relative value it is only necessary to remem- 

 ber that so many per cent means the same numlDer of pounds per hun- 

 dred, and that there are twenty hundred pounds in one ton (2,000 

 pounds). 



With an 8 — 2 — 1.65 goods, which means that the fertilizer con- 

 tains available phosphoric acid 8 per cent, potash 2 per cent, and 

 nitrogen 1.65 per cent, the calculation is made as follows: 



. ^r^r^ T-u Value Per Value Per Ton, 



Percentage, or Lbs. m 100 Lbs. ^^^ Lbs. 2,000 Lbs. 



S pounds available phosphoric acid at 41/0 cents... 0.36 X20= $7.20 



2 pounds potash at 51/2 cents 0.11 X2a= 2.20 



1.65 pounds nitrogen at I91/2 cents 0.321 X 20= 6.42 



Total value 0.791x20= $15.82 



Freight and merchant's commission must be added to these prices. 

 Freight rates from the seaboard and manufacturing centers to interior 

 points are given in the following table : 



