298 BUILDINGS, SANITATION, AND DISEASES 
keep the air dry. An extra opening made in the chimney shaft 
near the floor will serve to draw out much foul air. 
In fact, where winter litters are raised in large pens, some 
helpful device like this is absolutely necessary, 
Light.—Light, especially sunlight, has a wonderful influ- 
ence in promoting health. So far as possible, the windows 
should be on the south side of the building, because the south 
side gets the most sun and is least exposed to cold winds. 
Draughts.—While ventilation is necessary, draughts are 
extremely injurious, and their prevention should be kept in 
view when building. 
Warmth.—Warmth is a good thing, but it should not be 
secured at the expense of ventilation. .A somewhat cold pen, 
well ventilated but free from draughts, is preferable to a warm 
pen where the air is damp and foul, and the pigs will suffer 
less discomfort in the former than in the latter. Very young 
pigs require warmer quarters than older ones, and when a sow 
farrows in winter, special pains should be taken to secure 
warmth and freedom from draughts. If she is in a large 
piggery, it is often a help to lay poles across the tops of the 
partitions over the bed and then cover these poles with straw. 
PLANS OF PIGGERIES. 
The first. plan (Fig. 70) is that of a piggery recently erected 
upon the farm of the Ontario Agricultural College, Guelph. 
General Construction.—The building, is 32 x 127 feet out- 
side measurement. It is set on a cement concrete foundation 
which rixes about 12 inches above the level of the Hoor. The 
walls are built of 2x -+tinch studding, boarded on the outside 
with cheap lumber covered with two thicknesses of tarred paper, 
which in turn is covered with rustic siding. On the inside the 
