498 Profs. Percy Frankland and Marshall Ward. 



From the above tables it will be seen that the bacteria in the uniu- 

 fected Loch Katrine water underwent no multiplication, but, on the 

 contrary, slight decline. In the infected water the initial number of 

 typhoid bacilli must have amounted to about 22,000 per c.c., and 

 although the total number of bacteria in this infected water under- 

 went a great decline, there can be no donbfc that the water-bacteria 

 multiplied considerably, as was evidenced by the increased number of 

 liquefying colonies, the diminution in the total number of bacteria 

 being doubtless due to the disappearance of the typhoid bacilli. It 

 will be shown on p. 511 thai the typhoid bacilli were discovered for the 

 last time by the method of phenol broth culture on 7.11.1893, or nineteen 

 days after their first introduction. 



