74 



TH. THJ0TTA 



third examination was exactly the same as that of the second 

 test. 



Thus it is obvious that the bacillus of Morgan neither causes 

 the production of agglutinins in the serum of patients, in whose 

 intestines the bacillus lives, nor are the various strains of this 

 bacillus effected by the agglutinins of other similar strains. 



FIXATION OF COMPLEMENT 



Corresponding to the agglutination test cross examinations 

 of the fixation of complement by the various strains and sera 

 have been carried out. 



The result is given in table 3. 



TABLE 3 



Fixation of complement 



The titres of complement fixation in homologous strains and 

 sera are always high, while the heterologous strains and sera 

 usually do not cause any absorption of complement. Only one 

 strain, VI, is found to give a fairly high titre when tried with a 

 heterologous serum from strain IV. Titres such as 0.2 and 0.1 

 are too low to be counted and can hardly be taken as a signifi- 

 cance of any relation between strains. 



RESUME AND DISCUSSION 



Nine cases of diarrhoea or dysentery-form colitis are discussed. 

 Two of these ended fatally and the post-mortem examination 

 showed the existence of a severe colitis. 



