Circular 21 - Insecticides and Subsidiary Materials 79 
Its uses are somewhat limited. In addition to 
its employment -as an insect poison, it can be 
used as a rat poison and as a reagent in 
chemistry. 
Caution : Thallium sulfate even in. 
small dosages is a dangerous poison and must 
be handled with great care. It should be kept 
in tight, labeled containers and marked 
"Poison." The vapors which are given off when 
the material is heated, either alone or in 
solution, are poisonous and should not be 
inhaled. 
This compound is shipped ^n 1/4, 1, 
and 5-pound bottles at $5 "to $7 per pound. 
For' manufacturers and distributors see 
numbers IS, 41, 84, 87, and 103 of list at 
end of this circular. 
TIIRPSI\TINE 
Turpentine when combined with kerosene 
is used to control powder-post beetles. It 
can be applied to infested flooring; at the 
rate of 9 parts of turpentine to 1 part of 
kerosene, to kill Lyctus beetles without 
marring the finish on the wood. ;Vhen removed 
from the clothing or from animals, ticks may 
be dropped into turpentine to insure their 
death. 
Turpentine is a colorless or slightly 
yellowish, inflamiuable liquid with a charac- 
teristic odor and pungent, biting taste. It 
consists of terpenes (C3_o%6^ ^^^ ^^ widely 
used in medicine and in making paints and 
varnishes. It is obtained from various pine 
