26 



ELEMENTS OF WATER BACTERIOLOGY. 



Whipple has exhaustively studied the details of this 

 multiplication of bacteria in stored waters and has shown 

 in the table given below that there is first a slight reduc- 

 tion in the number present, lasting perhaps for six hours, 

 followed by the great increase noted by earlier observers. 

 It is probable that there is a constant increase of the 

 typical water bacilli, overbalanced at first by a reduction 

 in other forms, for which this is an unsuitable environment. 



BACTERIAL CHANGES IN WATER DURING STORAGE. 

 (Whipple, 1901.) 



* 0.0005 P er cent peptone added to the water. 



Wolffhiigel and Riedel (Wolffhugel and Riedel, 1886) 

 noted the dependence of this multiplication on the amount 

 of the air-supply, vessels closed with rubber stoppers show- 

 ing lower numbers than those plugged with cotton. Simi- 

 larly, Whipple found that the multiplication of bacteria 



