Contamination of Milk. 53 



head. Most of these gain access to the milk through 

 slovenly and careless methods of handling. Those spe- 

 cies associated with animal excreta are particularly dan- 

 gerous. The number of different kinds that have been 

 found in milk is quite considerable, something over 200 

 species having been described more or less thoroughly . 

 In all probability, however, many of these forms will be 

 found to be identical when they are subjected to critical 

 study. 



