196 



N. S. FERRY AND ARLYLE NOBLE 



B. pertussis strains can be specifically identified from hemoglobino- 

 philic bacilli, pertussis-like bacilli and B. bronchisepticus. In no 

 instance was there cross agglutination between thege organisms — at 

 least not higher than 1 : 40. 



Our work has corroborated that of the authors so far as they have 

 gone. Table 1 gives the results of agglutination between anti- 



TABLE 1 



Agglutination tests between antipertussis serum and heterologous suspensions. 



Results August 31, 1916. Serum from rabbit 7, treated with Bad. pertussis 



no. 0363 (Bordet) 



This table and the following one illustrate the presence of pro- agglutinoids 

 in Bact. pertussis and B. bronchisepticus antiserum making it necessary to test all 

 normal and immune sera in dilutions higher than 1-80. 



pertussis serum and suspensions of Bact. pertussis, a pertussis-like 

 bacillus, B. bronchisepticus, and three hemoglobinophilic bacilli. 

 But on using a B. bronchisepticus antiserum, the results are 

 entirely different, as the Bact. pertussis suspensions agglutinate 



