582 Bacilli Resembling the Typhoid Bacillus 



small agglutinations, but a comparison between these and 

 the agglutinations formed by cultures of the typhoid bacillus 

 shows immediately that the micro-organisms are dissimilar. 

 Differentiation is best made out when the prepared hanging- 

 drop specimens of serums and cultures are kept for some 

 hours in an incubating oven. It is not known whether the 

 bacillus is peculiar to the intestines of parrots, invading their 

 tissues when they become ill, or whether it is a purely path- 

 ogenic micro-organism found only in psittacosis. 



