Circular 21 - Insecticides and Sifcsidiary l^terials 64 
For Dianufacturers and distributors of 
phosphorus paste see numbers 26, 29, 83, SS, 
93, 99, 105, and 110 of list at end of this 
circular. 
PUfS OIL 
Pine oil is used to aid in dissolving 
pentaciilorophenol in li^^ht fuel oil for the 
treatment of seasoned wood to protect it fron 
attack by Lyctus beetles. Pine oils alone 
have been used to treat wood infested vvith 
pov/der-post beetles. 
Pine oil iG a colorless to pale yellow, 
oily liquid insoluble in v»ater and has a 
turpentine -like odor. It is obtained by 
steam distillation from certain species of 
pine trees. The oil is used as a solvent, 
in the manufrxture of textiles and paints, 
and for the flotation of lead and zinc ores. 
Pine oil is sold in tanks, 55-.jallon 
drums, at a price ran^in-::: from 3U to 65 cents 
per gallon. 
For manufacturers and distributors see 
numbers 5, 14, 27, 42, 52, and 113 of list 
at end of this circular. 
PIN2 TAR OIL 
This substance is used in combination 
with cottonseed oil to kill ticks in the ears 
of domestic animals. Pine tar oil is also used 
to protect wounds on animals from screwworm 
attack, in which use it should have a specific 
