PAPERS OX MEDICINE AND PUBLIC HEALTH »1 



for the ditch to be constructed by hand labor. By use of 

 dynamite the ditch was actually constructed for about 

 $1,200. 



The 40-acre lake on the south side was abundant with 

 cat-tail growth and pond lilies in a number of small bays, 

 and there was also a fin - around the edge 



of the lake, making it an ideal breeding place for mos- 

 quitoes. The water level in the lake was dropped IS 

 inches by cutting the outlet wall, and a great reduction 

 in breeding was at once apparent. The bays were cleared 

 of the cat-tails and pond lilies, and portions of the sur- 

 face and thf - oiled throughout the season. A care- 

 ful examination in September failed to mid any breeding, 

 when in May before the work started as many as _ 

 larvae could be secured in a single dip with a small 

 per. All ditches and streams in the area were carefully 



- ided, cleared and kept in a proper condition " 

 out the season for oiling. All ditches and other collec- 

 tions of water in the area were oiled once each w 

 uent inspections showed that almost perfect eoi 

 was established on natural br 



The most troublesome part of the campaign was the 

 control of rain barrels and other man-maintained bi 

 ing places. In June, out of 664 open wells and cisterns, 

 breeding was found in 391. and 5S4 were immediately 

 stocked with Gambusia. A later inspection of 60 wells 

 and cisterns showed that the fish were performing their 

 duties well, only two cisterns being found breeding, and 

 the fish had apparently been removed from these. The 

 control of rain barrels and tubs was accomplished by 

 regular house-to-house inspections. In June the first in- 

 :ion showed 1.030 containers. 831 being rain barrels 

 and tubs which were found breeding mosquitoes. The 

 second inspection in June canght - ntainer- 



ins:, the third inspection 154, and the fourth in* 



For the fifth inspection every container holding 

 ■r in the city was oiled. The sixth inspection a 

 19 containers breeding, the seventh 7. and the eighth 11. 

 By the height of the mosquito perfect 



trol had been t hed. 



