588 



Adeney — Dissolved Gases and Fermentative Changes. 



Fixation of Carbon Dioxide and of Ammoniacal Nitrogen. 



There is 3'et one further point of interest which I have to mention in reference 

 to these solutions, namely, an additional experiment which I made with the portion 

 of the solution S2, which remained after the various analyses had been made 

 on the day recorded, viz. January 21st. It will be seen on reference to Table IX. 

 that the solution on that date was very similar in composition, so far as the 

 probable character of the organic matters, and also so far as the composition of the 

 inorganic nitrogenous bodies it contained, was concerned ; to those in which we 

 have already observed a fixation of carbon dioxide and inorganic nitrogen to have 

 occurred during fermentation, viz. in solution 1/4 and in experiment 6, recorded 

 in Tables V. and VII. respectively. In order to ascertain whether a similar 

 action would take place during a further fermentation of solution S2, the remainder 

 mentioned above was re-aerated and bottled, and analysed before and after 

 keeping, with the following results : — 



From the results just given, it will be seen that a fixation of carbon dioxide 

 and ammoniacal nitrogen really occurred, as was anticipated during further 

 fermentation, but that apparently the nitrous nitrogen, unlike that in the case of 

 the two solutions above referred to, did not take part. 



Before passing on to describe my experiments with waters containing consi- 

 derable quantities of peaty matter, I will give some further experimental results, 

 which will be found to support the general conclusions which have been drawn 

 from those already considered. 



The full details of the experiments are recorded in the subjoined Tables : — 



