;02 



MICROBIOLOGY OF MILK AND MILK PRODUCTS. 



THE MILKER. Not infrequently the milker himself is an important 

 source of contamination. If his clothing and hands are dirty or if he 

 brushes against the cow, the dust thus dislodged may carry into the 

 milk large numbers of microorganisms. This is shown in the difference 

 in the germ-content of milk drawn by two men milking in the same bam 

 under identical conditions. 



FIG. 76. Colonies developed from a bit of dust found in cow stable. Agar plate culture. 



(Original.) 



Difference in Number of Bacteria in Milk Drawn by Men in Same Stable. 



