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 (p) on the door. Close over 

 the top of the door place a strip i 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 Syi 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 



