BUILDINGS 309 
depth of about two feet, in order to prevent draughts about 
the floor. This method of housing sows is better than close 
confinement in warm pens, and will be found to answer very 
| 
Opening. 
256 
16° 
Fig. 76.—Front view of portable pen. 
ra 
Fic. 77.—End view of portable pen. 
well when other means to provide shelter and exercise are not 
available. 
The A-shaped Pen.—The accompanying sketches (Figs. 78 
and 79) show a convenient portable pen which may be used 
