HOUSEHOLD AND CAMP INSECTS 45 



Cyclohexanone alone or with cyclohexanol is now used in pref- 

 erence to anisol (methyl phenyl ether), inert powders being impreg- 

 nated with these compounds.^^ 



Depediculization. The pests in garments and equipment can 

 be destroyed by either dry or moist heat or the application of 

 chemicals. 



The Vondran hot air apparatus is an equipment with an electric 

 blower which changes the air in a chamber 43 times in a minute, 

 and a uniform high temperature is quickly reached. To destroy lice, 

 45 minutes at 178° F., or 40 minutes at 186° F. was sufficient.^^ In 

 practice, heating for one hour at a temperature of 140° F. should 

 be sufficient.^* 



Clothing and bedding may be disinfested by using formaldehyde 

 12 per cent, and water vapor at 140° F. in vacuo. The preliminary 

 heating requires 20 minutes and the temperature is then maintained 

 at 140° to 144° F. for three-fourths of an hour.^^ 



Ironing the seams of clothing with a very hot iron is effective, 

 especially applicable to the outer garments, it frequently being 

 necessary to destroy the parasites in these at the time the men are 

 bathing.^® 



Infested clothing should be steamed under pressure 20 minutes or 

 dipped in solutions of cresol, 2 per cent or stronger, for 10 minutes 

 and hung up in the sun. Careful and vigorous brushing of uniforms 

 in the open will rid them of both lice and eggs.^^ The brush may 

 be moistened with a carbolic or cresol soap solution. ^^ 



Clothes sprinkled with a 25 per cent solution of ammonia and 

 put in a tightly covered box resulted in the death of both lice and 

 eggs in an hour. The results are not so satisfactory when the 

 clothes are wet.^^ Vermin in clothes may be destroyed with vapor 

 of chloroform, carbon tetrachloride or methane, and sulphurous 

 oxide. *^ The lice were all killed on infested clothes sprayed with 

 benzine and put in a tightly closed container.*^ 



Soap solutions containing 2 per cent of trichlorethylene or 10 per 



32 Wesenberg. Deutch. Med. Wochenschr., 41, 861-62. 1915. 



33 Baerthlein. Rev. Appl. Ent, 5 '.43-44. 1917. 



34 Heymann. Bui. Inst. Pasteur, 14:91. 1916. 

 3-"^ Swellingrebel. Rev. Appl. Ent., 5 •.33-34. 1917. 

 3fi Peacock. Brit. Med. Jour. 2892, p. 787. 1916. 

 37Legendre. Bui. Soc. Path. Exot, 8:280-83. 1915. 



38 Rev. Appl. Ent, 4:13. 1916. 



39 Beyer. Mil. Surg., 38:483-91. 1916. 



^'^ Postnikov. Rev. Appl. Ent., 3:122. 1915. 

 41 Renault. Paris Med., 5 :2o6-i2. 1915. 



