187 



Sera 

 Cultures 16 I 35 I 57 I 91 I 21 I 33 I 34 I 35 I 36 I 37 P 22 Me 1 a H34 Pa5 



From a perusal of this table we get a clear impression 

 of the numerous differences in agglutination among the various 

 strains of Pfeiffer's bacillus. The absence of agglutination 

 in the majority of experiments does not depend on simple 

 inagglutinabilily. This is clear in the first place because the 

 strains with which sera were prepared both in the present 

 experiment and throughout the whole investigation, always 

 gave typical agglutinations with their homologous serum. As 

 regards the strains with which serum was not prepared the 

 majority were agglutinated to a greater or lesser extent by one 

 or more of the 14 sera. Great differences in the sensitiveness 



Only examined in 1 : 50 and 1 : 100. 



