Plate I.— Drawings of Milk Smears as Seen Under the Microscope 



All prepared in such a way that each bacterium or tissue 

 cell seen is equivalent to 400,000 per cubic centimeter. 



GOOD QUALITY MILK. 



Fig. 1. — No bacteria seen. Two tissue cells. 

 Cell count = 800,000 per c. c. 



MILK SOURING NORMALLY. 



><••■ 





v 



Fig. 3.— Milk which is nearly sour. The majority of the 

 bacteria are lactic acid bacteria. One tissue cell. Bacterial 

 count = 80,000,000 per c. c. Cell count = 400,001 ) per c. c. 



