304 THE HOUSE FLY—DISEASE CARRIER 
the lumber order represent the standard sizes which 
should be ordered, but the purchaser need not expect 
to find that the pieces delivered correspond with mathe¬ 
matical exactness to the sizes called for. On this ac¬ 
count the pieces must be measured and cut to measure 
as they are put together. 
Estimate of Material for School Privy 
The following estimate of building materials has 
been made by a carpenter for the construction of a 
six-seated school privy. The estimated cost of these 
materials' is $25 to $50, according to locality; this does 
not include the pails, which ought not to cost over $1 
apiece. 
3 pieces scantling, 6 by 6 inches by 20 feet, 180 square 
feet. 
1 piece scantling, 6 by 6 inches by 8 feet, 24 square 
inches. 
Scantling, 2 by 4 inches, 165 square feet. 
Boards, 1 by 12 inches, 600 square feet. 
Boards, 1 by 10 inches, 185 square feet. 
Boards, 1 by 8 inches, 100 square feet. 
Boards, 1 by 6 inches, 80 square feet. 
Boards, x /i by 3 inches, 100 square feet. 
Flooring, 80 square feet. 
40 feet 15-mesh copper wire screen, 12 inches wide. 
12 pairs of hinges, 6-inch “strap.” 
6 pairs of hinges, 6-inch “T,” 
3 pounds of 20-penny spikes. 
15 pounds of 10-penny nails. 
8 pounds of 6-penny nails. 
6 coil springs for front doors. 
6 knobs or latches. 
