PRACTICAL DAIRY BACTERIOLOGY 



FIG. 32 PROPF.R CONDITION FOR COW S HINDQUARTERS 



the rubbing of the skin by the milker, and by the switching oi 

 the tail, there is constantly being shed a shower of such particles 

 from her body. This continues during the whole milking; and 

 the milk pails, which are generally widely opened, are calculated 

 to receive as large an amount of it as possible. The filth that 

 thus finds its way into the milk pail consists of almost every 

 conceivable kind of material. Besides excrement there are 

 grass, straws, insect wings, hairs and almost every other kind 

 of small particles. (Fig. 33.) The nature of this dirt and its 



