156 DDT — ^Killer of Killers 



lice, head lice, and crab, or pubic, lice. DDT 'is effeaive 

 against all three types. 



For the body louse, apply 1 ounce of 10% DDT pow- 

 der to the inner surface of underclothing and another % 

 ounce to the seams of the outer garments. A single applica- 

 tion will completely eradicate the lice, and if left in the cloth- 

 ing the powder will continue to kill lice for several months. 



For the head louse, thoroughly shake a 10% DDT pow- 

 der into the hair. It will kill all lice but will not kill the 

 eggs, or nits. Since it takes several days for the eggs to 

 hatch, the DDT powder should be left in the hair for at 

 least 10 days in order to kill the young lice as they hatch 

 from the eggs. An alternative method is to make two ap- 

 plications of the DDT powder about 8 to 10 days apart. 

 It is advisable to let each application remain for about 24 

 hours before washing the hair. The second application will 

 kill lice that have hatched since the first application was 

 made. 



In order to get rid of head lice in a hurry, the NBIN 

 formula can be used since it kills the eggs as well as the adult 

 lice. This material is applied to the hair in the form of an 

 emulsion made up of 5 parts of water and 1 part of a con- 

 centrate consisting of 68 parts of benzyl benzoate, 12 parts of 

 benzocaine, 6 parts of DDT, and 14 parts of a dispersing 

 agent. The hair should be thoroughly wetted with the emul- 

 sion, combed to insure uniform distribution, and then per- 

 mitted to dry. It is unnoticeable in the hair, and should be 

 left on for 8 to 10 days in order to kill any lice that may 

 have been hiding in the clothing and ultimately return to 

 the head. 



The crab, or pubic, louse can also be killed with either 

 a 10% DDT powder or an emulsion of the NBIN formula. 



