Circular 21 - Insecticides and Subsidiary Materials 28 
DUPONOL V/. A. 
Duponol W. A. , like Gardinol W. A. and 
Orvus 'd, A. , is a proprietary v/etting and 
spreading agent that is used as an emulsifier 
in place of soap, because it does not form a 
precipitate as does soap when hard v;ater must 
be used. It is especially useful in the 
preparation of pyrethrum larvicidal sprays 
with salt or hard water for application to 
the surface of mosquito infested pools, 
streams, and other breeding places. 
Duponol W. A, is a proprietary product 
prepared as a paste or in flakes, known 
chemically ^s sodium sulfate of technical 
lauryl alcohol (sodium lauryl sulfate). 
Like Gardinol V/. A. and Orvus W. A., Aresket, 
and similar products, Duponol V/. A. is used 
in the dyeing industry. 
For manufacturers and distributors see 
number 37 of list at end of this circular. 
ETHER 
In the control of screwworms, human 
nasal infestations may be treated by the use 
of ether to anesthetize the larvae before 
removal from the nose. 
Ether, (G2H5J2U or ethyl oxide, is a 
light, volatile, mobile, highly inflammable 
liquid with a characteristic aromatic odor. 
It is obtained by the distillation of alcohol 
with sulfuric acid, hence is called also 
sulfuric ether. Ether is a powerful solvent 
of many organic substances, is important in 
making rayon and ^moiceless powders. In 
medicine it is an important anesthetic. 
