388 



PHYSIOLOGY OF BACTERIA 



rapidly if air is excluded (see Table 128). Bad. coli 

 was tested by the same authors in nitrogen atmosphere, 

 and displayed no appreciable difference in the death rate. 



Table 128. — Death op BacL typhosum in Tap Water, with Various 



Gases 



This result was verified by Hinds (1916). He studied 

 the effect of nitrogen and hydrogen upon starving bac- 

 teria, and the average death rates found are given in 

 Table 129. The rates are then computed for the death 

 rate in air as standard of 100; we find that BacL typhosum 



