Circular 21 - Insecticides and Subsidiary Materials 29 
The price of ether ranges from 11 cents 
per pound in 310 pound drums to 16 cents per 
pound in 27 pound drums. It may also be 
obtained in 5 pound and 1 pound containers at 
36 cents and 45 cents per pound respectively. 
Available on contract: see Class 51, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
ETHYLENE DICHLORIDE 
A mixture of 3 volumes of ethylene di- 
chloride to 1 volume of carbon tetrachloride 
is a very useful fumigant for the control of 
stored food, grain and seed insects as well 
as for fabric pests such as clothes moths and 
carpet beetles. The addition of the carbon 
tetrachloride makes the mixture free from 
fire hazard, v/hile ethylene dichloride if 
used alone has a slight fire hazard. The 
mixture is generally used at the rate of 5 
quarts per 1000 cubic feet of space fumigated. 
Ethylene dicnioride, C2H/CI2, is a 
colorless, heavy liquid. It has a pleasant 
ether-like odor and a sweetish taste, but the 
vapors are somev/hat irritating. The liquid 
will keep indefinitely but is volatile and 
must be kept tightly stoppered. Ethylene 
dichloride is a solvent for fats, waxes, 
resins, and rubber, and is used in the 
manufacture of acetyl cellulose. 
Cautio n: Keep in tight containers in 
a cool place. Avoid exposure to the vapors 
and inhaling of the gas, especially since it 
may be dangerous to man in cases of long 
exposure or high concentrations. 
