STUDIES UPON AGGLUTINATION 



49 



TABLE 8 



Agglutination of Bad. dysenteriae and Bad. coli, with normal and immunized 

 horse serum with different organisms 



I I 



Key: 5, complete; 4, almost complete; 3, weak; 2, very weak; 1, trace; 

 0, negative agglutination. 



In neutral broth the motility, spontaneous agglutination 

 and also specific serum agglutination, were much weaker than 

 in acidified broth. Formalin, prevented spontaneous agglutina- 

 tion entirely. 



In alkaline broth most strains of Bad. typhosum showed a 

 much weaker growth, motility and spontaneous agglutination. 



