IX 



B. coli, hut may fail to give one or other of the charac- 

 teristic tests). 



5) Results produced in the same media by other 



micro-organisms. 



From Tahle I it will he seen that B. typhosus seems 

 to possess the power of reducing neutral red, though 

 not to such an extent as B. coli; the reduction is 

 therefore not specific to the. latter bacillus. From the 

 column neutral it will be seen, that after 24 hours 

 B. typhosus has altered the colour from iron red to 

 orange, while B. coli has changed it to canary yellow. 

 This is certainly a colour difference, but after 2 days 

 this has become more doubtful, as the colours are 



11 



