202 



MOSQUITO ERADICATION 



connects with a sided or weather-boarded surface. The best 

 way of doing this probably is to cut the support to fit the surface. 

 If this is not practicable, the resulting spaces should be filled up 

 with paper pulp, pieces of wood or other material. 



Sometimes the nailing of a strip along the outer edges of the 

 porch as a support for the bottom of the screen wire may interfere 

 with the draining off of rain-water that may be blown in on the 

 porch during storms. One way to provide for this contingency 

 is to bore a few holes in the floor just inside the bottom strip and 

 tack small pieces of screening material over or underneath them. 



SCREENING OF CHIMNEYS AND FIRE-PLACES 



When the house is provided with fire-places, screens are 

 required either at the tops of the chimneys or over the openings 



Fig. 143.- 



([/. S. Public Health Service) 

 -Chimney protection. 



of the fire-places. Observations indicate that, unless the chimney 

 or fire-place is screened, mosquitoes will descend into the house 

 by this route in abundance. 



As the fire-places are usually not used much during the 

 mosquito season, it has been found that screening the chimney 

 is often the easiest way of handling this matter. A section of 

 screen wire is placed over the chimney and held in position by a 

 tier of bricks around the edge of the top. 



As soot soon fills the meshes of the wire, if the chimney is used, 



