196 The Control of Mosquitoes 



mosquitoes matures. It also facilitates inspection 

 and enables the location and extent of the seepage 

 outcrops to be determined. It shortens the effec- 

 tive length of the wet season so far as mosqmto 

 production is concerned, and makes it possible to 

 locate all new small temporary production areas 

 that may exist during excessively wet periods. 

 We fotmd it advisable to clear the ground before 

 locating ditches, to ensure their correct placing. 

 The jungle was so thick that on relatively fiat 

 lands it was impossible to determine the position 

 of the low places by inspection, for when wander- 

 ing around in the brush it is easy to lose aU sense 

 of direction. Adult Anopheles and other mosqui- 

 toes rest in the shade, and the removal of the 

 jungle reduces the number that enter dwellings. 

 Clearing made it impossible for the negroes to 

 throw containers into the tall grass or brush near 

 their houses without detection. They were accus- 

 tomed to throw "them away and would' carry 

 unserviceable containers a long distance to dispose 

 of them rather than put them in the neprby 

 garbage cans! We cut pathways along the edges 

 of streams and ditches, cleared the edges of ponds, 

 and removed grass from puddles and wet lands to 

 facilitate the application of oil and larvacide. 

 Much of the clearing in lagoons had to be done 



