ECONOMIC EFFECT OF MOSQUITO REDUCTION 319 



Fig. lxxxvi. Areas designated for analysis of tax valuations, corresponding 

 to tables in text. 



the period during which mosquito control had progressed so little that 

 tax valuations were not affected. For each group a second period, from 

 1915 to 1930 inclusive, was set up as the period during which tax valua- 

 tions might reflect anti-mosquito work. 



The table plainly shows that yearly increase in tax valuations was 

 greatest where mosquitoes had never been very troublesome, the gain 



