no LABORATORY BACTERIOLOGY 



Examine the cultures microscopically in all the fertile tube 

 to determine if they are pure. 



Explain the cause for the difference in the thermal death 

 point between these two organisms. 



Inoculate for the next exercise a tube of bouillon from a cul- 

 ture of M. {Staph.) pyogenes aureus and one from a culture of 

 B. subtilis furnished. 



