304 THE HOUSE FLY— DISEASE CARRHni 



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. 

 I piece scantling, 6 by 6 inches by 8 feet, 24 square 



inches. 

 Scantling, 2 by 4 inches, 165 square feet. 

 Boards, i by 12 inches, 600 square feet. 

 Boards, i by 10 inches, 185 square feet. 

 Boards, i by 8 inches, 100 square feet. 

 Boards, i by 6 inches, 80 square feet. 

 Boards, 3^ 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 lo-penny nails. 



8 pounds of 6-penny nails. 



6 coil springs for front doors. 



6 knobs or latches. 



