Report on the Bacteriology of Water. 



523 



Typhoid-infected Steam-sterilised Thames Water inoculated with a 

 few drops of Unsterile Thames Water (16.1.1894). 



The 115,000 bacteria per 1 c.c. contained in this water must have 

 been almost exclusively typhoid bacilli, for, after infection with 

 typhoid, 4l)0 c.c. were inoculated with 1 c.c. of unsterile Thames 

 water. Now, this unsterile water, as seen from table, p. 520, con- 

 tained about 5000 water bacteria per 1 c.c. ; 5000 water bacteria 

 must thus have been added to 400 c.c. of this typhoid-infected steam 

 sterilised Thames water, which would thus contain about twelve 

 water bacteria per 1 c.c. in addition to the typhoid bacilli with which 

 it had been previously infected. These few water bacteria must have 

 undergone rapid and extensive multiplication, for, on 22.1.1894, a 



VOL. !.VI. 2 M 



