120 PRINCIPLES OF POULTRY-HOUSE CONSTRUCTION 
Windows and Curtains.—Window and curtain openings in the 
poultry house are valuable, in that they admit sunlight and fresh air, 
cleansing the house, and making it a congenial place for the birds. 
They should be so arranged that they can be opened quickly and 
easily, and the danger of breakage thus reduced to a minimum. 
Too narrow and too low 
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Correct positiciz 
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Insutficient in amount and too low 
Fic. 76.—Three plans for placing openings in front wall of poultry houses. 
Sunlight is necessary to the fowls, but too much glass makes 
the house cold at night and too warm in the daytime. An excessive 
emount of glass makes the house too expensive. A good rule for 
large houses using muslin openings is to allow one square foot of 
