192 The Farmstead 



there will be openings at the top, bottom and 

 middle of the windows. The impure air is 

 largely found at the top of the room and at the 

 bottom. If, then, the warmer and lighter air is 

 allowed to escape at the top, the colder air will 

 rush in at the bottom, which will result in keep- 

 ing it moving as water moves when the inflow 

 is at or near the bottom of a vessel and the 

 outflow near the top. Whenever only one Xvin- 

 dow can be secured in the sleeping room, large 

 transoms should be placed over the doors into 

 the hall. While this method does not ventilate 

 as well as the other, it serves to keep the air 

 pure in the chamber. When there are many 

 rooms situated on one hall, the hall should be 

 ventilated by means of windows at its end, or at 

 the top of the house. Many farm houses are 

 over -ventilated in winter, the cold air entering 

 the loose casements until the wash water ex- 

 pands and breaks the pitcher. In such cases 

 storm sashes are a necessity, and are more eco- 

 nomical than feather beds or coal in preserving 

 a living temperature. 



