Clean Milk 



should be smooth and of a material such as 

 plaster, adaptable to a light color. 



The smoothness is of value, as it offers a 

 difficult lodgment for dust, and a diminu- 

 tion of dust deposit means not only less 

 necessary cleaning, but a reduced chance of 

 infection, inasmuch as dust in the air is the 

 principal conveyor of dried sputum, which 

 may contain the tubercle bacilli. 



The light color is a way of increasing the 

 light in a barn, and the need of light is so 

 great that the owner of dairy cattle cannot 

 afford to neglect any means of supplying it. 

 Its value comes home to him if he remem- 

 bers that there is a definite inverse ratio 

 between the amount of light in the stable 

 and the spread of tuberculosis among the 

 cattle therein, and aside from the fact that 

 the danger of infection by one tuberculous 

 cow of the entire herd is lessened, there is 

 the consideration of the general health of 

 the animals, which is admittedly better 

 maintained in a light stable. 



The principal and often the only source of 



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