15 



*Cotton'^eed meal guaranteed 6.17% nitrogen was offered in September. 1916, 

 for .$33.50; December 1, 1916 for $46.00 cash. 



From the above it is quite eAadent that no average of trade 

 values could have been established that would have been satisfac- 

 tory on account of the wide fluctuating prices which prevailed. At 

 the annual meeting of experiment station representatives held last 

 March, these conditions were carefully considered, and it was finally 

 voted unanimously to omit the establishment of a table of trade 

 values for the season of 1916. 



Ground Bone. Seventy-two samples have been 

 General Information inspected during the season, necessitating 

 Concerning Regis- thirty-nine analyses. Ground bone has av- 

 tered Raw Products eraged 3.02 per cent of nitrogen, 74.18 per cent 

 and Chemicals. of which has been found active by the labor- 



atory method (alkaline permanganate). The 

 average phosphoric acid was 24.82 per cent. The average retail 

 cash price has been $37.91 per ton. The guarantees on bone were, 

 on the average, well maintained, only one brand showing a serious 

 commercial shortage. 



Bangh Is Sons Co. Raw 'Bone Meal, Nos. 218-339. Nitrogen 

 found 3.54%, guaranteed 3.70%; phosphoric acid found 21.23%, 

 guaranteed 21.50%. 



Ground Tankage. Thirty-five samples of tankage have been in- 

 spected, necessitating twenty-nine analyses. Five of these samples 

 were found deficient in nitrogen. The average total nitrogen found 

 was 7.93 per cent, of which 81.67 per cent has been found active 

 by the laboratory method. The average phosphoric acid found 

 was 12.49 per cent. The average retail cash price has been $43.27 

 per ton. Assuming that the pound of phosphoric acid in tankage 

 is worth four cents, the cost of the pound of nitrogen from this source 

 would have been twenty-one cents. Three brands were found to have 

 rather serious commercial shortages. 



