INFLUENCE OF VACUUM UPON GROWTH OF BACTERIA 297 



The few remaining are probably unable to grow to any extent in 

 the highly acid medium. 



Here, also, the amount of air present in the containers has no 

 influence whatever upon the thermal death point of the bacteria 

 present. 



TABLE 9 



Influence of varying amounts of acetic acid and air upon the thermal death point of 



B. mesentericus spores 



Experiment VI shows the influence upon the thermal death 

 point of B. subiilis and B. mesentericus of several of the more 

 common organic acids found in fruits. The spores were prepared 

 as described in experiment V and placed in the acid solutions 



