Circular 21 - Insecticides and Subsidiary Materials 17 
Caustic soda is marketed in barrels and 
drums from ^^2.70 to •?2.95 per 100 pounds. 
Available on contract: See Class 51, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
CEDAR (OR CEDARWOOD) OIL 
This volatile oil is useful in the 
preparation of certain mosquito repellents. 
Application of the repellents is made locally 
to the afflicted portions of the skin. 
Cedar oil or cedarwood oil is a color- 
less or slightly yellow, somewhat viscid liquid. 
It is one of the volatile or essential oils and 
is characterized by a distinct cedar-like aroim . 
The oil is extracted i^ro:'! v/ood of the red and 
other species of cedar. The uses of this sub- 
stance are not extensive but it is an ingredient 
in some perfumes, soaps, and toilet preparations. 
This material should be kept well closed, cool, 
and protected from light. 
Cedar oil may be purchased in cans and 
drums at a cost of 28 to 3A-i cents per pound. 
For manufacturers and distributors see 
numbers 1, 25, 34, 38, 50, and 74 of list at 
end of this circular. 
CHL0ROFOR]\I 
This liquid may be used in the same way 
as benzene (benzol) for treating wounds infested 
with screvAvorm larvae especially when such 
infestations occur in the nose of man. The 
