34 

 Ground Bone and Tankage — Continued. 

 Brands Substantially Meeting Their Guarantees — Concluded. 



1 Two analyses made. 



2 One lot of this bone, collected at Dracut, was not whoUy uniform either in appearance or composition. 

 Three individual sacks tested from 2.41% to 3.04% of nitrogen and from 26.38% to 27.71% of phosphoric 

 acid. No serious deficiencies were found. 



' Three analyses made. 



* The sample tested 3.89% total nitrogen, of which 1.70% was from sulfate of ammonia (this would be 

 equivalent to 34 pounds of nitrogen, 165 pounds sulfate of ammonia in one ton of the product). 

 Without the addition of the ammonium sulfate the sample would have been deficient in nitrogen .27%, 

 and would have shown a commercial shortage of $1.15 per ton. With the addition of the ammonium 

 sulfate the sample overran in commercial valuation $4.80 per ton. The sample tested 22.6% of total 

 phosphoric acid, of which only 5.25% Cabout 23% of the total) was in available form. The average of 

 400 analyses of steamed bone made at this laboratory shows over 50% of the total phosphoric acid in 

 available form (soluble in neutral citrate of ammonia). The sample, moreover, showed the presence of 

 2.36% of iron and alumina oxides, while the average bone shows hardly more than a trace of these 

 elements. The company's chemist states his opinion that the product was likely South American 

 bone, which varies widely both in content of nitrogen and phosphoric acid from the native product. 

 A sample of so-called South American bone recently analyzed at this laboratory showed .86% nitrogen 

 and 32.63% total phosphoric acid, of which 15.98% was available; it showed mere traces of iron and 

 alumina oxides. 'These comparative results might indicate the presence of fine ground rock phosphate 

 in the United States Guano Co.'s sample. 



