49(5 Profs. Percy Frankland arid Marshall Ward. 



The above tables show that the bacteria in the uninfected Thames 

 water underwent very considerable multiplication, and in the 

 typhoid-infected water, although the total number of bacteria de- 

 clined, it is certain that the water-bacteria underwent considerable 

 multiplication, as there was a great increase in the number of lique- 

 fying colonies ; the diminution in the total number of bacteria was 

 due to the disappearance of the typhoid bacilli which were initially 

 present to the extent of about 16,000 per c.c. It will be slwivn 

 (.p. 508) that typhoid bacilli were no longer demonstrable in this water 

 by phenol broth culture after 28.10.1893, or nine days after their intro- 

 duction into the Thames water. 



