Circular 21 - Insecticides and Subsidiary Materials 56 
OLIVE OIL 
The use of kerosene oil and olive oil 
is recommended in the control of head lice. 
Olive oil is a pale-yellow or yellowish' 
green non-drying oil expressed from olives. 
It is used as a salad oil, in cooking, as a 
lubricant and illuminant, and in toilet soaps. 
The coramercial containers for olive oil 
are barrels weighing 375 and 500 pounds, and 
cans containing I/4, 1, 5, and 10 gallons. 
In drums the oil is priced from $3.85 to 
$5.50 per gallon. 
Available on contract: see Class 51, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
ORTHODIC!iLORCBi:.^::i.^ 
Orthodichlorobenzene (C5H^Gl2) in the 
crude form is used for checking the activity 
of Lyctus and other pou'der-post beetles 
working in seasoned wood, and for poisoning 
the soil about the foundations of buildings 
for termite control. For the latter purpose 
it can be used alone or diluted witli coal-tar 
creosote, or li::ht fuel oils. 
Chemically, orthodichlorobenzene is a 
colorless, stainless liquid, soluble in 
alcohol or ether, which mixes readily with 
various oils. The commercial product ordi- 
narily sold is a crude chlorinated benzene 
product. It is somewhat expensive but very 
effective. • It is very penetrating and may 
mar the finish on wood, which can, however, 
be refinished without difficulty. Orthodi- 
clilorobenzene is noninflammable but is 
