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. 



MILK OF FAIR QUALITY. 



Fig. 2. — Two pairs of lactic acid bacteria and one single bacter- 

 ium. One tissue cell. Bacterial count = 2,000,000 per c. c. 

 Cell count = 400,000 per c. c. 



POOR QUALITY MILK. 



W*'' 



Fig. 4. — Milk which is both nearly sour and suspicious in 

 sanitary quality. Seven tissue cells. Bacterial count = 

 100,000,000 per c. c. Cell count = 2,800,000 per c. c. 



