OTHER INTESTINAL BACTERIA. 



103 



were either present in pure culture or in great predomi- 

 nance as shown by the accompanying tables. The samples 

 of water were plated directly upon litmus-lactose-agar and 

 he plates were incubated at 37 for twenty-four hours, 

 when the red colonies were counted. At the time of plating, 

 i c.c. from each sample was also inoculated into dextrose 

 broth in fermentation-tubes, which were likewise incu- 

 bated at 37. After various periods, as indicated by the 

 tables below, the tubes were shaken thoroughly and i c.c. 

 of the contents withdrawn. This was then diluted 

 (generally 1-1,000,000) with sterile water, plated with 



TABLE I. 



RELATIVE GROWTH OF B. COLI AND SEWAGE STREPTOCOCCI FROM 

 POLLUTED WATERS IN DEXTROSE BROTH. 



(Prescott and Baker, 1904.) 



