M BACTERIA 



in line, and a regiment of 160,000 of these germs 

 could be pushed through one of the squares abreast. 

 This shows clearly how the finest cheese cloth 

 cannot possibly filter bacteria out of milk. 



Dirty milk may look clean because it has been 

 strained, but the large numbers of bacteria which 

 pass through the filter will show by their pres- 

 ence that the milk was unclean. 



The cleanliness of milk cannot be measured 

 by the so-called "dirt test," which uses a strainer 

 because milk may have been previously strained. 



The test for bacteria is therefore the best pos- 

 sible way to measure the cleanliness of milk. 



