Report on the Bacteriology of Water. 



425 



tubes, to which the same proportions, as above, of phenol solution 

 were added, and all these tubes similarly became turbid on being 

 kept at 38 C. for twenty-four hoars. 



Thus at the outset of this series of experiments, the uninfected 

 Thames water was sharply distinguishable by means of the phenol 

 broth test from the same Thames water after infection with either 

 the typhoid bacillus or the B. coli communis. 



The uninfected and infected unsterilised Thames waters were 

 as^ain compared by the method of phenol broth cultivation on 

 29.5.1893. 



The results recorded in the above table indicated that on 29.5. 1893, 

 whilst there were still no bacteria in the uninfected unsterilised 

 Thames water to interfere with the phenol broth test, this test pointed 

 to the presence of living typhoid bacilli in the typhoid-infected Thames 

 waters, which had been kept both at 6 C. and at 19 C. (flasks 1 B 

 and 1 I). The results of the test, moreover, indicate that these 

 typhoid bacilli were now less numerous or in a less active condition 

 in the flask 1 I (19 C.) than in the flask 1 B (6 C.), because both 

 phenol broth tubes prepared from 1 B became turbid already in 

 twenty-four hours, whilst of the two similar tubes prepared from flask 

 1 I, only the one in which 1 c.c. of water was employed for cultivation 



