146 



Mr. F. Kidd. 



Table VI. 





CO* required to reduce anaerobic respiration from 1 in pure 

 nitrogen to 



0-8. 



• 0-6. 



0-5. 



0-4. 



0-35. 



90 hours curve 



51 „ 



31 „ 



19 „ 



per cent. 

 7 

 7 

 8 

 8 



per cent. 

 23 

 23 

 23 

 24 



per cent. 

 38 

 36 

 38 

 35 



per cent. 

 72 

 62 

 55 

 56 



per cent. 

 100 

 85 

 74 

 74 



Average 



75 



23 3 



36 -75 



60 -75 



83 -2 



Table VI, derived from the results plotted in fig. 1, gives the fractional 

 depression of C0 2 production (taking that in absence of C0 2 = unity) for 

 different concentrations of C0 2 . This Table shows the results for all the four 

 time curves in fig. 1 to be fairly concordant. These average values, supported 

 by average values similarly obtained from other sets of experiments, are 

 plotted in fig. 3, which thus represents for our experiments the general 

 expression for the depressant action of C0 2 upon anaerobic C0 2 production. 



20% 



40% 



bO%\ 



8o% 



100% 















































































































































































{ 



























































































































































































































































































































































































































t 



























































































































































































































































































































































































































































































. 



t- 























































































































































































































































































































H 

















































































H 

















































































\ 





























3 

















































































































































































































\ 































































































































































\ 













































































































































































































































\ 







































































































































































































































































































































































































r 









































































































































































































































































































































































































\ 































































































' 









































































































































































































































































































































































































































































*- 











































































1 































































































































































































































































































































d-6 



02 



i-o o-» O'C 



Fig. 3. — General expression for depressant action of carbon dioxide upon anaerobic 



C0 2 production. 



