STEEPTOCOCCUS HEMOLYTICUS 



207 



TABLE 12 



Experiment XIII 



Numbers represent colonies developing from one loopful of culture. 



+ + + Profuse growth; ++ good growth; + growth sparse (less than 50 colo- 

 nies); ± growth very doubtful (one or two colonies); — no growth after twenty- 

 four hours incubation. 



SUMMARY 



1. Streptococcus hemolyticus is able to ferment the common 

 hexoses and disaccharides but not the polysaccharides. The 

 final hydrogen-ion concentration produced in broth containing 

 different sugars varies between the limits Ph 4.85-5.40. The 

 lowest Ph is registered in broth containing glucose; the highest 

 Ph in broth containing lactose. The characteristic final Ph is 

 seldom reached in the first generation but is usually attained by 



