No. 5. DEPARTMENT OF AGRICULTURE. 443 



sulphate. This discrepancy between analytical report and guaranty 

 may be due to the rule of practice stated in the first sentence of this 

 paragraph, and not to any act of bad faith on the part of the man- 

 ufacturer. The rule of practice is adopted chiefly for the reason that 

 plants injured, like tobacco and sometimes potatoes, by an excess of 

 chlorin, is injured equally, whether the chlorin be introduced as 

 muriate of potash, as common salt, or as magnesium chloride. At 

 present prices for the two potash salts, muriate and sulphate, the 

 only weightly reason for introducing the more costly sulphate, is 

 to insure the purchaser of tobacco and potato fertilizers against pos- 

 sible injury by chlorin. Under our system of valuation, the manufac- 

 turer must exclude chlorin from every source to gain the valuation 

 advantage from his use of sulphate of potash. 



In certain cases where specific claim is made by the manufacturer 

 that potash has been added as carbonate, potash in excess of that 

 equivalent to soluble chlorides and soluble sulphates will be valued as 

 carbonate. 



Nitrogen in mixed fertilizers will be valued as derived from the 

 best sources of organic nitrogen, unless clear evidence to the contrary 

 is obtained. 



Phosphoric acid in mixed fertilizers is valued at bone phosphoric 

 acid prices, unless clearly found to be derived from rock phosphate. 



Bone is sifted into two grades of fineness : Fine, less than 1-50 inch 

 in diameter ; coarse, over 1-50 inch in diameter. 



The result obtained by the use of this schedule does not cover the 

 items of mixing, bagging, freight and agents' commission. To cover 

 these, allowances are made as follows: 



For bagging, an allowance of |1.00 per ton on all fertilizers, except 

 when sold in original packages. 



For mixing, an allowance of fl.OO per ton on complete fertilizers 

 and rock-and-potash goods. 



For agents' commission, an allowance of 20 per cent, is added to 

 the cash value of the goods ready for shipment. 



For freight, an allowance of |2.00 per ton on all fertilizers. 



