SPECIFIC MICRO-ORGANISMS 



broth containing maltose, B. typhosus produces acid, B. coli 

 produces acid and gas, and B. dysenteries produces neither. 

 Specific agglutination with the serum of an animal immunized 

 with a known culture constitutes the most important test in the 

 identification of unknown forms falling within this group. This 

 test may be used with the capsulated species after they have 

 lost the tendency to form capsules through propagation on artifi- 

 cial media. 1 



1 Fitzgerald: Proc. Soc. Biol. and Med., 1913, Vol. X, pp. 52-53 



