18 



culated commercial valuation has been $51.08 per ton. A pound of 

 nitrogen from this source has cost on the average 17.4 cents. The 

 two samples of nitrate of soda showing a commercial shortage of over 

 fifty cents a ton are the following: 



Lowell Fertilizer Co., No. 239-346-372-365-1116. Nitrogen 

 found 14.76%, guaranteed 15.00%. 



Whitman & Pratt Rendering Co., No. 663. Nitrogen found 

 15.26%), guaranteed 15.63%. 



Four samples have been analyzed and all were 

 Sulfate of found well up to the guarantee. The average re- 



Ammonia, tail cash price has been S76.33 and the average com- 



mercial valuation $67.52 per ton. Sulfate of am- 

 monia has tested on the average 20.46 per cent nitrogen. The average 

 cost of a pound of nitrogen in this form has been 18.65 cents. 



Eight analyses were made and the nitrogen 

 Calcium Cyanamid. guarantee was well maintained in all cases. 

 The average retail cash price for this product 

 has been $61.75 and the average calculated commercial valuation 

 $58.78 per ton. Calcium cyanamid tested on the average 15.07 per 

 cent nitrogen, making the average cost of a pound of nitrogen from 

 this source 20.48 cents. In valuing this product no account has been 

 made of the 50 odd per cent of calcium oxide present which would 

 eventually have a desirable sweetening effect on the soil. 



POTASH COMPOUNDS. 



Thirty-two samples have been inspected, represent- 

 High Grade ed by 14 analyses. The guarantee was well 

 Sulfate of maintained in all cases. The retail cash price for 

 Potash. this salt has been $49.53 and the average calcu- 

 lated commercial valuation $50.21 per ton. The 

 average analysis for high grade sulfate of potash showed 50.21 per 

 cent of potassium oxide. The pound of actual potash, in this form, 

 has cost on the average 4.93 cents. 



Seven analyses have been made and the potash 

 Potash- guarantee was maintained in all but three cases. 



Magnesia The average retail cash price has been $28.50 and the 



Sulfate. average calculated commercial valuation $26.49 per 



ton. This salt has tested on the average 26.49 per 

 cent actual potash. The average cost of a pound of potash from this 

 source has been 5.37 cents. Only one of the brands had a commer- 

 cial shortage of over fifty cents per ton. 



American Agricultural Co., No. 420. Potash found 24.76%, 

 guaranteed 26.00%. Two other samples of this same brand were 

 found well up to the guarantee. 



