302 THE HOUSE FLY—DISEASE CARRIER 
joist. Stops may be placed inside the door. These 
should be i inch thick, 3 inches wide, and 6 feet 6 
inches long, and should be jogged (that is to say, cut 
out) to fit the cross-cleats (/>) on the door. Close over 
the top of the door place a strip 1 inch thick, 2 inches 
wide, 30 inches long, nailed to I. (Fig. 37). A corre¬ 
sponding piece is placed higher up directly under the 
roof, nailed to G. A strap or door-pull is fastened 
to the outside of the door. 
Ventilators .—There should be five ventilators ( w ). 
One is placed at each side of the box directly under the 
seat; it measures 6 to 8 inches square. Another (12 
inches square) is placed near the top on each side of 
the privy. A fifth (30 inches long 8 l / 2 inches wide) is 
placed over the door, between G and I (Figs. 37, 38). 
The ventilators are made of 15-mesh copper wire, 
which is first tacked in place and then protected at the 
edge with the same kind of lath that is used on the 
cracks and joints. 
Lath .—Outside cracks (joints) are covered with 
lath one-half inch thick by 3 inches wide. 
Receptacle .—For a receptacle, saw a water-tight bar¬ 
rel to fit snugly under the seat; or purchase a can or 
tub, as deep (17 inches) as the distance from the un¬ 
der surface of the seat to the floor. If it is not pos¬ 
sible to obtain a tub, barrel, or can of the desired size, 
the receptacle used should be elevated from the floor 
by blocks or boards so that it fits snugly under the seat. 
A galvanized can measuring 16 inches deep and 16 
inches in diameter can be purchased for about $1, or 
