280 PRODUCTION AND DISTRIBUTION OF CERTIFIED MILK 



adequate ventilation either by means of some approved arti- 

 ficial device, or by the substitution of cheesecloth for glass in 

 the windows, each cow to be provided with a minimum of 600 

 cubic feet of air space. 



9. Windows. — A sufficient number of windows shall be 

 installed and so distributed as to provide satisfactory light and 

 a maximum of sunshine, 2 feet square of window area to each 



Flo. 92. — These cows keep themselves clean by stepping forward to lie down in front 

 ol the 2 x 4-inch stringer which holds the bedding in place. Note the broad shallow gutter, 

 safe and easy to clean. (Owned by C. C. Graves, Maryville, Mo.) 



600 cubic feet of air space to represent the minimum. The 

 coverings of such windows shall be kept free from dust and dirt. 



10. Exclusion of Flies, Etc. — All necessary measures should 

 be taken to prevent the entrance of flies and other insects and 

 rats and other vermin into all the buildings. 



11. Exclusion of Animals from the Herd. — JSTo horses, 

 hogs, dogs, or other animals or fowls shall be allowed to come in 



