470 Profs. Percy Frankland and Marshall Ward. 



In this case there was a very considerable increase in the total 

 number of bacteria present, due to the extensive multiplication of 

 the water bacteria, as shown by the great increase in the number of 

 liquefying colonies. As this multiplication is much more marked 

 than in the uninfected water, it must obviously have been promoted 

 by the small quantity of organic matter unavoidably introduced along 

 with the typhoid bacilli. 



Similarly the plate cultivations of the nnsterilised Loch Katrine 

 water infected with the B. coli communis \ielded the following 

 results : 



