Circular 21 - Insecticides and Subsidiary Materials 1 
INSECTS IN RELATION 
TO 
NATIONAL DEFENSE 
Circular 21 - Insecticides and aitsidiary Materials 
Table of Contents 
Page 
Forev/ord 3 
Alcohol 7 
Aresket 8 
Asbestos S 
Benzene 9 
Borax 10 
Calcium Chloride 11 
Camphor 12 
Carbolic Acid 12 
Carbon Dioxide 13 
Carbon Disulfide 1^ 
Carbon Tetrachloride 15 
Caustic Soda l6 
Cedar ( or Gedarwood ) Oil 17 
Chloroform 17 
Chloropicrin 13 
Coal Tar Pitch 19 
Coal Tar Plastic Cement 20 
Coconut Oil Soap (Liouid) 20 
Collodion 21 
Cottonseed Oil 22 
Creosote Oil 22 
Cresols 24 
Cube Powder 24 
