334 MICROBIOLOGY OF MILK AND MILK PRODUCTS. 



B. coll and certain other types. The presence of unusual numbers of 

 streptococci and pus cells may indicate the existence of disease in the 

 cows and when this condition is found in the city milk it is possible to 

 trace it back to the farm and locate the diseased cow and prevent her 

 milk from being used for human consumption. 



The tendency at present is to combine the quantitative and qualitative 

 analyses and the results thus obtained in the hands of the careful worker 

 are of much practical value in controlling the quality of the city's milk 

 supply. 



