Smithsonian Report, 1947. — Stage 



Plate 4 



1. Leaves showing good coverage of droplets of DDT spray even in the lower 

 elevations of the jungle. (Photograph by Signal Corps, U. S. A.) 



2. Naias bed in Gatun Lake, Panama, where a dozen Anopheles albitnanus larvae 

 were taken in each of 200 samples before treatment with DDT. Twenty-four 

 hours after treatment not a single larva could be found. 



