CHEiVnCAL CORN-GROWING. 87 



whom we could rely : receiving the article we purchased, aud 

 of the composition as stated by them. 



Three thousand two hundred and thirty-two pounds of sul- 

 phate of ammonia, containing 18 per cent, of nitrogen, at 2| 

 cents a pound, = 26|- cents a pound for the nitrogen. 



One thousand two hundred and eleven pounds of muriate 

 of potash, containing 55^ per cent, of potassa, at 3 cents a 

 pound, = 5|- cents a pound for the potassa. 



Four hundred aud forty-two pounds of sulphate of potash, 

 containing 23-25 per cent, of potassa, at 2^ cents a pound, 

 =z 10 j^^ cents a pound for the potassa. 



We would here call attention to the difference between 

 purchasing high and low grades potash salts. As the supply 

 of muriate of potash, or the high grade kainit was exhausted 

 from our market, we had to till out our potash with the lower 

 grade sulphate. We had, by doing this, to pay nearly double 

 per pound for the 102 pounds of potash contained in the 442 

 pounds of sulphate, than we did per pound for the 645^^^^ 

 pounds of potash in the 1,211 pounds of muriate. 



We then purchased 1,061 pounds of bone-black, at $25 per 

 ton; 530 pounds of sulphuric acid, at 2| cents per pound; 

 paid $1.60 freight. We now mixed our bone and acid, and 

 produced 1,591 pounds of superphosphate, containing 18 per 

 cent, of soluble phosphoric acid, as Prof. Stockbridge assures 

 us, and as is also indicated by the analysis of a similarly made 

 article by Prof. Storer at Roxbury. The total expense of 

 our superphosphate was at the rate of $35.22 per ton, or 

 slightly under 9^^^ cents a pound for our phosphoric acid. 



In 1874 the price in Germany and abroad for the materials 

 we have used as below : — 



Nitrogen in form of ammonia, 



Phosphoric acid, in higher grade superpliosphate, . 

 Potash in high grade kainit, ..... 

 Potash in low grade kainit, .... S^q to 9^^^ " " 



Of course the difference between the prices here and in 

 Germany for the potash salt, is largely dependent on the 

 cost of transportation and handling, and a low grade salt will 

 have its price per pound for the potassium oxide which it con- 

 tains, more enhanced through costs of moving, than will the 

 potassium oxide in a high-grade salt. ' 



