gredients of plants, phosphates, ammonia, carbonaceous mat- Food ' or 

 ter, and an excess of oxygen must be present. 



Peat containing much copperas, coal-tar, gas-lime con- f 95 

 taining sulphites and sulphides, kill the ferment. The Ni- 

 trate ferment is developed during the slow decay of organic 

 matter in all soils. 



How to Make Commercial Valuations. 



First, of unmixed chemicals. 



Multiply the guaranteed per cent, of 

 Nitrate of Soda by 16.47, which gives the Nitrate of Soda ' 

 per cent, of Nitrogen ; multiply the per cent, of Nitrogen thus 

 obtained by the trade value of Nitrogen in the form of Ni- 

 trates (15 cents per pound), then multiply the last result by 

 20, which gives the value per ton. 



Example. A Nitrate of Soda is guaranteed to be 95 per 

 cent, pure; that is, the total impurities in it amount to 5 per 

 cent.: 95 X 1 6. 47= 15. 64 per cent, of Nitrogen; 15. 64V 

 I5=$2.34, value of Nitrogen in 100 pounds; $2.34X20 

 =$46.80, value per ton. 



Multiply the guaranteed per cent, of 

 sulphate of potash by .54; multiply the re- Sulphate of 

 suit by the trade value for potash in high- otas "' 

 grade sulphate (5 cents) and multiply the last result by 20. 



Example. A high-grade sulphate of potash is guaran- 

 teed by the manufacturer to contain 45 per cent, of sulphate 

 of potash: 45-)-. 54=24.30 per cent, of actual potash; 

 24.30x5=122 cents, or $1.22, the value of actual potash 

 in 100 pounds of sulphate; $1.22 X 2 o=$24.4O, value per 

 ton. Multiply the guaranteed per cent, of 

 muriate (chloride) by .63; then multiply Muriate of Potash 

 the result by the trade value for potash in (Chloride), 

 the form of muriate (4^2 cents per pound for 1892), and 

 multiply the last result by 20. 



Example. A muriate of potash is guaranteed to contain 

 80 per cent, of muriate (chloride) : 80 X- 63=50. 40 per 

 cent, of actual potash; 5O.4OX4/ / 2 centS:: = : 227 cents, or 

 $2.27, the value of actual potash in 100 pounds of sulphate; 

 $2.27X20=$45.40, value per ton. 



Second. How to make a commercial valuation of a fer- 

 tilizer from a guarantee-analysis as given by manufacturers. 



