Circular 21 - Insecticides and ^Absidiary Materials 43 
areas. This spray is also useful against 
chiggers on the body. Ticks or other pests 
when removed from the clothing or body of man 
or skin of animals may be killed by dropping 
them into kerosene. Equal parts of kerosene 
and either olive oil or vinegar nay be applied 
to the hair and scalp to control human head 
lice. /:ji emulsion of kerosene, soap and water 
is also used to kill body lice. 
Kerosene is a mixture of hydrocarbons, 
lighter than v/ater, and boilin^^. betv/een about 
A-00^ and 575° F. Ordinarily it is colorless 
but may be colored as sold coimuercially. The 
chief source of kerosene is from crude oil but 
some is obtained from oil shale. It is also 
knovm as coal oil or laiiip oil and is used in 
some internal coiabustLon en^'ines, in oil stoves 
and oil lights. 
The price of kerosene in tank cars at 
the refineries is 4-5/S to 11-1/2 cents per 
gallon depending; upon the location in the 
United States. 
Available on contract: see Glass 14, 
G-eneral Schedule of Supplies, Procurement 
Division, Treasury Department. 
LAI'.LP BLACK 
Lamp black is one of tlie in.-redients of 
Formula No^. 62 of the 3ureau of Sntoiiiology and 
Plant ;;uarantine, \/hich is a combination of 
screwworm killer and wound protector in the 
form of an ointment or smear for animals. 
The fine, bulky, black soot deposited 
by the smoke from burnin.; oil, tar, or rosin 
