130 



PRACTICAL DAIRY BACTERIOLOGY 



where they have been intelligently used they have been found 

 to be efficient in producing a much cleaner quality of milk. On 

 the other hand, they are themselves difficult to clean. Long rub- 

 ber tubes which have been filled with milk are by no means easy 

 to keep sweet, and when they are used by careless employees 

 the bacteria become very abundant inside the tubes and the 



FIG. 54 USE OF A MILKING MACHINE OUT OF DOORS 



Power is supplied by animals in treadmill on right 



(Kansas Experiment Station) 



other parts of the somewhat complicated machine. In other 

 words, it requires very great care in cleaning and sterilizing 

 these milking machines in order to produce better results than 

 are produced by hand milking, or even as good; but they can be 

 cleaned, and, if care is taken to sterilize thoroughly all of the 

 apparatus, better and more reliable milk can be obtained by the 

 use of the milking machine. Directions for cleaning these ma- 

 chines will always be given with the machines themselves and 

 need not be given here. The general principle, however, that 

 extreme care should be taken to disinfect thoroughly the rubber 

 tubing after each" milking cannot be too highly emphasized. 

 The use of these milking machines certainly offers a great 



