EXPERIMENT STATION BULLETINS. 627 



Part III. 



Facts disclosed in a study of the presence of Bad. abortus in milk by 

 means of the agglutination test. 

 Introduction. 

 Review of literature. 

 Technic employed. 

 Investigational work. 



Prevalence of Bact. abortus infected udders. 



Duration of Bact. abortus infection in udders. 



A study of the methods by which the udder becomes infected. 

 Age at which infection first appears in udders. 



Summary and Conclusions. 

 Part I. 

 Part II. 

 Part III. 



