202 The Control of Mosquitoes 



the panel. Screen panels should not be more than 

 three feet wide and eight feet long. Wider or 

 longer panels resist wear less satisfactorily. 



The screening should be fastened with copper 

 tacks to prevent galvanic action, and the edges 

 overlaid with wooden strips three-eighths of an 

 inch by one inch, and fastened with galvanized 

 wire nails. The tacks should be placed at least 

 one half inch from the edge of the screening. 

 The screening should be drawn as tight as possible, 

 without the aid of special stretching devices; i.e., 

 it should be stretched tightly enough to prevent 

 denting and consequent breaking in cleaning, but 

 not so tightly as to put immoderate strain upon 

 the strands bearing against the tacks. 



It was found advantageous to protect in a 

 similar manner the lower panels of verandas, the 

 lower parts of the panels above hand rails, panels 

 immediately adjacent to doors, and other panels 

 subjected to hard usage by the inhabitants. 

 Strips of wood have not proven satisfactory in the 

 protection of screening. They have the inherent 

 defect of interfering seriously with the success of 

 mosquito destruction within the houses. 



When screening is kept clean, by frequent 

 removal of the dust and the products of corrosion, 

 the amount of light and air excluded by the eigh- 



