348 



MILK 



duced a coagulum that was granular and broken up by gas- 

 bubbles. When sterile milk was inoculated with a mixture of B. 

 aerogenes and Streptococcus lacticus, less gas was produced, and 

 the gas evolution ceased after a short period. Sterile milk inocu- 

 lated with Str. lacticus alone was coagulated promptly, and in 



Fig. 166, a. Streptococcus pyogenes 

 from serum broth. 



Fig. 166, 6. Streptococcus pyogenes 

 from litmus milk. 



Tig. 166, c. Streptococcus lacticus 

 from serum broth. (Strain I.) 



Fig. 166, d. Streptococcus lacticu? 

 from serum broth. (Strain II.) 



this case the coagulum was smooth and without evidence of gas 

 evolution. Huppe's organism is most frequent in surface por- 

 tions of milk, while Leichmann's is more common in deep por- 

 tions, owing to the inclination of the streptococcus to anaerobic 

 conditions. Both types are practically always present in market 



