STABLES FOR COWS 315 



pected to work in a barn not tightly constructed so the air 

 finds entrance or exit at other places. Where properly in- 

 stalled, this system gives excellent results. A barn filled with 

 animals will show no barn odor in the morning after being 

 closed over night where this system is used. 



Window Ventilation. Some well-constructed barns de- 

 pend upon hinged windows for ventilation. These are 

 usually hinged at the bottom, so the top may be tilted inward 

 to the desired extent. By careful constant attention this 

 plan may give fair results. The movement of air in this 

 case is dependent upon wind pressure and further the warmest 

 and not the coldest air is removed. 



