142 AGRICULTURAL BACTERIOLOGY 



milking; he must exert his efforts to prevent the soiling of 

 the animal. The yards should be well drained, arid covered, 

 if possible, with some material that will not become muddy, 

 such as cinders or gravel. 



It should be kept in mind that the stable in which dairy 

 cattle are kept represents a factor in the determination of 



Fig. 32. Bacteria on Hairs 



Cow hairs were placed on the surface of an agar plate. The adherent bacteria 

 developed and formed colonies 



the quality of the food that is to be produced therein. The 

 stalls should be so constructed that the cows will automati- 

 cally be kept clean. They should be of a proper length for 

 each animal, and the gutters should be deep and wide in 

 order that the manure that accumulates between the periods 

 of cleaning will not reach the level of the floor of the stall. 



