Fig. 7. An Unsung Hero of the War — A Volunteer Lets 

 Body Lice Feed on His Back in Experiments That Helped 

 Government Agencies Develop DDT for Use Against the 

 Typhus-Carrying Louse. The Lice, on Patches of Cloth, are 

 Allowed to Feed on the Subjects Back and Are 

 Then Removed. 



{Courtesy of U. S. Dept. of Agriculture) 



(55) 



