Smithsonian Report, 1948.—Knipling PLATE 5 
1. Aerial photograph of Navy TBF airplane applying DDT spray along the 
Florida coast. ‘Vhe control of both larvae and adult mosquitoes over large 
areas represents a new method of mosquito control which few would have 
believed possible prior to the advent of DDT. The equipment on this plane 
was designed in cooperation with the Navy. 
2. Laboratory test of insect repellent. Candidate insect repellents were first 
tested in the laboratory using caged mosquitoes. Here Dr. B. V. Travis 
has inserted his partially treated arm in a cage containing several thousand 
hungry mosquitoes. 
