Report on the Bacteriology of Water. 461 



The above results were most unexpected, for they show that, 

 ilthongh as many as 75,000 typhoid bacilli per 1 c.c. were introduced 

 into this water, they were entirely destroyed in five days at 19 C., 

 and had undergone a very large reduction in number at 6 8 C., 

 whilst in twelve days they were no longer discoverable in this water 

 kept at the low temperature. On 2.6.1893 sterile broth was added 

 to the flasks, which were then placed in the incubator at 38 C., but 

 even this treatment did not lead to any revivification of the typhoid 

 bacilli, which could neither be detected by plate cultivation nor 

 phenol broth- culture. 



The same rapid destruction of the B. coli communis was observed 

 in this water, as will be seen from the following table : 



2 i 2 



