QUALITATIVE BACTERIOLOGICAL ANALYSIS. 157 



merit of horses, cows, dogs, guinea-pigs, pigeons, mice, frogs, &c. 

 They were detected in gradually increasing numbers in the 

 mouth, stomach, small and large intestines. Rabinowitsch 

 considered that the bacteria were facultative anaerobes. At 

 high temperatures they grew well as aerobes, but very slowly as 

 anaerobes ; at lower temperatures, on the other hand, they grew 

 better under anaerobic than aerobic conditions, especially when 

 broth was used as the nutrient medium. The following table 

 gives the characteristics of the eight varieties of thermophylic 

 bacteria which developed at 62 C. : 



