THE DAIRY 



103 



color at the junction of the milk and acid, indicates 

 the presence of formalin. 



8. Promptly cool and aerate the milk to prevent de- 

 velopment of bacteria. 



9. The cows should be healthy, especially as related 

 to tuberculosis. 



10. The stables should be well lighted and ventilated. 



Courtesy Edgewood Farm. 

 FIG. 34. A MODEL Cow BARN 



Testing and selecting the cows. The butter that 

 milk will produce comes from the butter-fat that it con- 

 tains. It is, therefore, important that the milk from 

 each cow of a herd test well in butter fat, as well as be 

 abundant in quantity. In general, no cow is paying 

 her board bill whose milk tests much less than 3 per cent 

 of butter-fat; neither is one which is giving less than 

 twelve pounds daily. Every farmer should own a good 



