12 



Proceedings of the Royal Irish Academy, 



Table II., 



Showing the percentages of the products, recorded in Table I., which 

 were due to respiratory changes, and of those which were due to 

 enzymic change, the total carbon dioxide and inorganic nitrogen 

 compounds being taken each as 100. 



Eesults of 

 Eespiratory Changes. 



i 



Enzymic 

 Changes. 



Oxygen absorbed by other 

 Physiological Processes. 



No. 



COo 



NH3 



N2O3 



O2 

 absorbed 



CO2 



NH3 





3 



100-0 



67-7 



32-3 



89-9 



0-0 



0-0 



1 10-15 



4 



57-7 



37-5 



18-8 



84-6 



42-3 



41-0 



15-45 



5 



25-9 



17-2 



8-6 



83-5 



74-1 



73-8 



16-54 



It will be observed that the division of the fermentative products 

 between the processes of respiratory and enzymic changes in accordance 

 with the above equations (1 and 2) is shown to be justified by the fact 

 that the inorganic products are nearly all accounted for. 



The respiratory changes were similar in degree in the two experi- 

 ments 4 and 5 ; but the enzymic changes were very different. This 

 was no doubt due to the solution in the latter experiment being kept 

 for some time after aerobic conditions had ceased. 



The Chemistry of more Advanced Stages of Fermentative Change. 



The next series of experiments were carried out with the object of 

 studying more advanced stages of fermentation ; and with this object 

 in view known volumes of air were left in the flasks above described 

 to act as reservoirs of oxygen. 



The experiments were commenced on the same day as the foregoing 

 and with portions of the same solution. 



