Adeney — Dissolved Gases and Fermentative Changes. 



595 



the oxidation of ammonia to nitric acid has been complete, small quantities of 

 peaty or fermented organic matters have always been present. The same may be 

 said, I think, of the experiments of the above observers in which nitric acid was 

 formed. 



In other experiments which I shall have to describe, and in which the only 

 change in the conditions has been a practical absence of all organic matters, I have 

 also obtained abundant nitrous fermentation, but no nitric. In reference to the 

 experiments last mentioned, it is of importance and of interest to note that the 

 organisms present were of the same mixed character as in the case of those 

 experiments in which, as stated, I obtained nitric fermentation. 



With these prefatory remarks, I may now proceed to the discussion of the 

 exjDeriments with the extract of peat above mentioned. 



The details and results are recorded in the two following Tables : — 



[Tables XIV. and XV. 



TEANS. EOT. BUB. SOC, N.S. VOL. V., PAET XI. 



4P 



