Report on the Bacteriology of Water. 



459 



by the direct method of plate cultivation, and show that both the typhoid 

 and coli bacilli were still present in a living state in this water, irre- 

 spectively of whether it had been preserved at a summer or a winttr 

 temperature, for a period of seventy-five days. 



Behaviour of the Typhoid Bacillus and of the B. coli communis in 

 Thames Water sterilised by Filtration through Porous Porcelain. 

 (First Series of Experiments^) 



The preparation and infection of this water has already baen 

 described (see pp. 410 and 411), and, as already indicated, the infected 

 water was placed under precisely the same conditions of tempera- 

 ture, &c., as the steam-sterilised and unsterilised waters. In the 

 periodical examination of this water the following results were 

 obtained : 



VOL. LTI. 



L' I 



