36 

 TABLE NO. 2. 



♦Dried blood (pots 1 A, B, C, D, E, F, G. H), cistor pomace (pots 15 A, B), garbige tankage 

 (pots 62 A, B), received their nitrogen as indicated from unwashed material. 



A study of the above table shows that in 2o out of 41 cases (Gl 

 per cent) the alkaline permanganate method indicates higher nitro- 

 gen activities than docs the vegetation test; that in 4 cases out of 41 

 (9.7o per cent) the alkaline permanganate method fails to differentiate 

 between the low and high grade forms of organic ammoniates. In 

 three of these cases the fertilizers were known to contain organic vege- 

 table ammoniates (castor pomace and cottonseed meal). It would 

 appear that the chief criticism of the m.ethod is that it sometimes gives 

 too low results with organic vegetable ammoniates of good qualit}'. 

 It was hoped that time might be found to test such samples by the 

 pepsin digestion method, but the pressure of other work prevented. 

 The results of the experiment emphasize the necessity of some re- 



