454 SWINE IN AMERICA 



on the north side of the alley as does the window E for 

 the pen on the south side. By this arrangement of win- 

 dows, there is possible a maximum amount of sunlight 

 on the floor of the pens in winter, which will serve to 

 warm the interior of the house and especially the beds 

 during the later months of winter, thus making it possible 

 to have pigs farrowed very early in the season. Sunlight 

 not only warms and dries the building, but destroys dis- 

 ease germs, thus making the building both warm and 

 sanitary. Sanitation is further augmented by the upper 

 part of the window D, which, when open, acts as a ven- 

 tilator. It is supplied with weights, so that it can be 

 opened and closed at will by the attendant while stand- 

 ing on the floor of the alley. 



"To have this arrangement of windows in the latitude 

 of, say, central or northern Illinois, it is necessary to have 

 the top of the window E, which throws light into the pen 

 on the south side, 5 feet 6 inches from the floor. 

 The upper window, which throws light into the pen on 

 the north side, is longer, but a point in this window, the 

 same distance above the lower end as the height of 

 the window E should be 9 feet 8 inches from the 

 floor. This necessitates a flat roof for the part of the 

 building south of the alley, which must necessarily be 

 made of some material that will shed water at a slight 

 pitch. The wall on the north side of the building is 

 made as high as that on the south side, but the roof on 

 the north side and alley is made steeper, so as to give 

 more air space and good ventilation. This part of the 

 roof, then, may be made of shingles. 



