Circular 21 - Insecticides and Subsidiary Materials 34 
with v/ater, alcohol, and acetone. Its chief 
uses are in the manufacture of dyestuffs, as 
a food preservative, and as a disinfectant. 
Caution : Because of its poisonous na- 
ture, care should be exercised in handling it 
and inhaling of the fumes should be avoided. 
It should be stored in a moderately warm place 
and kept tightly closed. Rubber gloves should 
be worn while handling it, as it will corrode 
the skin. 
Formalin may be obtained in barrels, 
drums, carboys, and kegs at prices ranging 
from 5»4 cents in drums to 9.5 cents in kegs. 
Available on contract: see Class 51, 
G-eneral Schedule of Supplies, Procurement 
Division, Treasury Department. 
FUEL OIL 
Fuel oil or light petroleum oil has 
been recommended in the control of powder- 
post beetles, termites, and surface-breathing 
species of mosquito larvae. Seasoned wood 
may be protected from Lyctus powder-post 
beetles by soaking with a solution of penta- 
chlorophenol in light fuel oil. Light petro- 
leum oil may be used to dilute orthodichloro- 
benzene to double its volume for surface 
application to wood to kill all stages of 
powder-post beetles. Light fuel oil combined 
with coal-tar creosote makes an effective soil 
poison for killing termites. A film of light 
fuel oil (grade No. 2) on water will prevent 
mosquito larvae from obtaining air at the 
water surface, which results in the death of 
the surface-breathing larvae. It is also used 
with creosote oil in controlling stableflies. 
