66 



This 2 inch by 8 inch forms a plate to which the rafters and roof boards are nailed. 

 The 7-inch extensions of the plate at the ends support the cornice, and protect 

 the lower corners of the roof, which otherwise would be easily split off. The 2-inch 

 by 8-inch planks, besides strengthening the house, raise the rafters and the roof 

 boards nailed to them at least three inches off the floor, and thereby increase 

 the floor space and capacity of the Jiouse. 



If the house is to be used in cold weather, a door will be necessary, which 

 may be hung on hinges or made to slide up out of the way. The doorway is shown 

 in the drawings 20 inches by 30 inches. In the case of very large sows, it would 

 be better to make the door three feet high. 



Fig. 23. — End view of A-shaped pen. 



The dotted lines in the drawings indicate the scantlings which constitute the 

 framework of the pen. 



The ventilator is made by cutting the upper ends from two roof boards, oppo- 

 site one another. Then 2-inch by 2-inch pieces are nailed on top of the battens 

 on each side of the opening, meeting at the top, and boards are nailed on top of 

 these strips on each side of the roof. The upper ends of these boards meet at 

 the top, and the lower ends come an inch or two past the lower sides of the opening. 



It is recommended to have a door at the back of the building similar to the 

 one in front, for purposes of ventilation in hot weather; also a small opening 

 near the peak at the rear of the building, which could be covered with a slide, 

 and used to assist ventilation under some circumstances. 



Owing to the fact that the runners are likely to decay, some prefer to have 

 them not fastened to the building, so that they can be renewed conveniently. In 



