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though they seem to be more nearly 

 in conformity with a reguhxr rule. 

 On the whole, the rate of ammonia 

 production decreases as the am- 

 monia accumulates; yet in view 

 of the small amounts in which this 

 constituent is present (see Table 

 9), it Avould seem that the am- 

 monia is but an index of the re- 

 tarding agent and not the retard- 

 ing agent itself. 



The production of ammonia is ^ 

 clearly due to enzym action, but 

 the nature of the specific enzym 

 and of the mother substance re- 

 mains to be determined. 



Table 11 shows the distribution 

 of nitrogen and phosphorus ex- 

 pressed in terms of percentages 

 of total nitrogen and total phos- 

 phorus. 



Soluble nitrogen constitutes 29.8 

 per cent of the total nitrogen in 

 the fresh material, 23.28 per cent 

 in the material incubated for 7 

 days, and 36.45 per cent in the 

 sample incubated for 100 days. 

 The decrease in the ratio of solu- 

 ble nitrogen to total nitrogen in 

 the samples incubated for 7, 14, 

 and 21 days confirms similar data 

 presented in Table 10. 



Coagulahle nitrogen makes uj) 

 17.79 per cent of the total nitrogen 

 in the fresh material and only 3.52 

 per cent in the sample incubated 

 100 days. More than 80 j^er cent 

 of the coagulable nitrogen present 

 in the fresh material has been con- 

 verted into noncoagulable foi'ins. 



ProteoHe nitrogen constitutes a 

 relatively sinall i)r()))ortion of the 

 total nitrogen both in the fresh and 

 in tJK! incubated material. 



