28 ELEMENTS OF WATER BACTERIOLOGY 

 BACTERIA IN DEEP WELL AND SPRING WATERS 



It is plain that water absolutely free from bacteria 

 is not ordinarily obtained from any source. In deep 

 wells, however, their number is small; and the peculiar 

 character of the organisms present is manifested in 

 many cases by the slow development at room tem- 

 perature (frequently no growth until the third day), 

 the entire absence of liquefying colonies, and the 

 abundance of chromogenic species. 



