224 



LAURENCE F. FOSTER 



Ph occurs during the succeeding period when the cells are increas- 

 ing at a diminishing rate. Stated differently, the curves of 

 growth in each culture depress more sharply from the maximum 

 period than do the curves of glucose utihzation and acid for- 

 mation. Reference to table 5 shows that hemotoxin production 

 cormnenced in the seriun cultures by the sixth hour and persisted 



'H 





3^9 Hoorg 



Fig. 2. Experiment III. Culture (1); 1 Per Cent Glucose Broth 



for at least three hours. In the glucose culture however, no 

 definite appearance of hemotoxin was evident until the ninth 

 hour. In each case hemotoxin appears in the period character- 

 ized by growth and acid formation at decreasing rates. 



Reference to figures 5, 6, and 7 indicates that ammonia pro- 

 duction was undergoing a definite increase by the third hour in 

 each of the cultures. This increase in the serum cultures (figs. 



