136 



MORPHOLOGIC VARIATION 



rank order of the cultures according to their rates of autolysis, the 

 alkaline culture which required the longest time for half of the dead 

 cells to become stainable being the one with the lowest index of 



Alkaline _ _ 



Days 



5 



10 



Pays 



25 



Fig. 36. Rates of Death and Autolysis in Various Cultures of a Colon 



Bacillus. 

 Solid lines indicate percentage decrease in plate counts; dotted lines, per- 

 centage increase in stained cells; dot-and-dash lines, percentage decrease in 

 microscopic counts. 



