BACTEEIAL MILK ANALYSIS 



247 



500,000 



are distin- 



Counts between 100,000 and 

 guished by fifty thousands. 



Counts between 500,000 and 1,000,000 are distin- 

 guished by hundred thousands. 



Counts between 1,000,000 and 2,000,000 are distin- 

 guished by two hundred thousands. 



Counts between 2,000,000 and 5,000,000 are distin- 

 guished by five hundred thousands. 



Counts above 5,000,000 are distinguished by millions. 



Therefore only the following figures are used in 

 reporting : 



Counts on "certified" or "inspected" milk shall be 

 expressed as closely as the dilution factor will allow. 



The whole number of colonies on the plate shall be 

 counted, the practice of counting a fractional part being 

 resorted to only in case of necessity, such as partial 

 spreading. 



Various counting devices have been recommended 

 by different workers. The more simple ones, where the 

 whole plate can be seen at once, are more desirable on 

 account of there being less likelihood of recounting 

 colonies. Colonies too small to be seen with the naked 

 eye or with slight magnification shall not be considered 

 in the count. 



Examination of cellular content of milk. Examination 

 of milk sediment reveals certain cellular constituents 

 which when present in abnormal quantities are often 

 regarded as indicating a pathological condition in the 



