212 



Theobald Smith 





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Proteus vulgaris. This species has certain points of con- 

 tact as regards morphology with the B. coli group. It differs 

 in possessing very active peptonizing properties as manifested 

 in gelatin. Its power of gas production is peculiar in that a 

 smaller quantity of gas is formed than in cultures of B. coli. 

 It likewise is peculiar in being unable to produce gas in lactose 

 bouillon while its action in glucose and saccharose bouillon is 

 the same. Repetition of the gas test at intervals and with 



