174 BACTERIOLOGICAL EXAMINATION OF WATER 



ACTION OF ANTI-TYPHOID SEKUM ON CULTUEES OF 

 B. COLI FKOM HEALTHY DEJECTA. 



The sign + indicates complete agglutination. 



+ ,, nearly complete agglutination. 



partial agglutination (a few clumps but many motile 



bacilli). 

 no traces of agglutination. 



The results given in the above table closely agree with 

 Jatta's experiments, and show that the limit of the dilution of 

 anti-typhoid serum which causes agglutination of the B. coli 

 from healthy stools is about 1200. The results, however, with 

 B. coli from typhoid stools were somewhat different, and suggest 



