Report on the Bacteriology of Water. 

 of Bacillus /3 in Sterile Water. 



357 



Bacillus vj, are not contradictory of the foregoing indeed they sup- 

 port them so far as they go but are less conclusive in detail. 



On September 5 two Erlenmeyer flasks charged with sterile dis- 

 tilled water, to which a loopful of the bacillus in question was added, 

 were placed out in the usual way. Flask labelled ij (1) was covered ; 

 flask TJ (2) was exposed over and in front of plane mirrors. 



A plate from each flask at the beginning gave respectively 1,470,144 

 and 1,699,360 ; total, 3,169,504 ; mean, 1,584,752, as the number of 

 bacteria per c.c. to start with. 



The flasks were out from 10 A.M. to 4.30 P.M., the day being beauti- 

 fully bright with a hot sun and blue sky. The temperature in the 

 covered flask rose to 33 C. in the afternoon, that in the exposed 



