DISTRIBUTION OF DISEASE GERMS 91 



that samples of " wagon milk " contained 409,477 bacteria 

 per cubic centimeter, while " dipped store milk " contained 

 8,206,000 bacteria per cubic centimeter. In Newark, New 

 Jersey, it was found that " bottled wagon milk " contained 

 416,000 bacteria per cubic centimeter, while "dipped wagon 



FIG. 48. Bacteria in milk 



Each colony was produced by a single bacterium. The upper plate was inocu- 

 lated with sterilized milk, the left-hand plate with certified milk, and the right- 

 hand plate with ordinary milk. After J. C. Olsen, " Pure Foods " 



milk" contained 3,623,333 bacteria per cubic centimeter; 

 that milk delivered to a store contained at the time of its 

 delivery 280,000 bacteria per cubic centimeter, while eight 

 hours after its delivery the number had increased to 1,488,000 

 bacteria per cubic centimeter. 



