Circular 21 - Inseoticides and Subsidiary Materials 12 
CA.MPHOR 
Camphor is used for local external 
applications to alleviate flea and mosquito 
bites. Spirits of camphor which is used for 
this purpose is a liquid containing the cam- 
phor in solution in alcohol. Mixed v/ith cedar 
oil, and oil of citronella, it serves as a 
repellent against mosquitoes. 
Camphor is a gumlike, crystalline com- 
pound, CioHieO, often called camphor cuiii, which 
is a fragrant substance slowly volatilizing on 
exposure to air. It is obtained fro.ii the bark 
and wood of the camphor tree, chiefly from 
Japan and Formosa, and is used in medicine, in 
celluloid manufacture, and in pyrotechny. A 
synthetic caiaphor is also manufactured from 
certain terpenes. 
Camphor is marketed in 100 pound cases 
containing 2^ pound slabs, tablets in 1 pound 
tins or in po\/der form at a cost range of from 
$1.15 to $1.20 per pound. In larger quantities 
it is cheaper. 
Available on contract: See Class 51 i 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
CARBOLIC ACID 
Carbolic acid is often used to disinfect 
skin wounds caused by attacli:nent of various 
species of ticks, also as a spray for animal 
pens in the control Ox scab mite and as a 
larvicide for no-seo-um larvae. 
