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Neither winter snows nor the spring and summer rains should be allowed to beat into a pigpen. But the difficulty is to have a door that will shut itself and can be opened by the animals whenever they desire. The engraving, Fig. 3, shows a door of this kind that can be applied to any pen, at least any to which a door can be affixed at all. It is hung on hooks and staples to the lintel of the doorway, and swinging either way allows the inmates of the pen to go out or in, as they please,—closing automatically. If the door is intended to fit closely, leather strips two inches wide should be nailed around the frame of the doorway, then as the door closes it presses tightly against these strips.

FIG. 3. AUTOMATIC DOOR.