196 



MOSQUITO ERADICATION 



RARITY OF GOOD SCREENING 



Observations indicate that a very large percentage of the 

 screening ordinarily done is not 100 per cent effective. This may 

 be due to three general reasons, which are as follows: (1) Attempts 

 to screen houses that are so poorly constructed or are in such 

 poor condition that they cannot be effectively screened; (2) 

 poorly constructed or improperly fitted screens or screens having 



(U. S. Public Health Service) 

 Fig. 139. — Tenant house in too poor a condition to warrant screening. 



too large meshes; and (3) the use of sliding or easily removable 

 screens, which frequently result in their being left open through 

 carelessness or negligence. 



Tarbett 1 reports that inspection of houses in the vicinity of 

 an aviation camp in Arkansas in 1918 revealed that not 10 per 

 cent of the buildings were properly screened. In this same 

 connection, Carter 1 says: "I do not think that 2 per cent of the 



1 Transactions of the First Annual Conference of Sanitary Engineers, 

 U. S. Public Health Service, 1919. 



