Report on the Bacteriology of Water. oiil 



Typhoid-infected Unsterilised Thames Water (16.1.1894). 



Bearing in mind (see table, p. 520) that the uninfected unsterilised 

 Thames water contained about 5000 water bacteria in 1 c.c. on the 

 day of infection, it is "evident that about 170,000 typhoid bacilli per 

 c.c. were introduced. The periodical examinations recorded above 

 show that these numbers steadily declined, and from the character of 

 the colonies obtained on the plates, it appears that the water bacteria 

 underwent no marked multiplication, thus, no increase in the number 

 of liquefying colonies was observed. The gradual diminution in the 

 total number of colonies obtained may be ascribed, therefore, to the 

 dying off of the 170,000 typhoid bacilli per c.c. introduced (see also 

 results of phenol broth-culture experiments, p. 525, et seq.). 



