Circular 21 - Insecticides and Subsidiary Materials 69 
Silver nitrate may be obtained in 100- 
and 200-ounce bottles at 24 cents per ounce. 
It is packed also in 1-, 4-, and l6-ounce 
bottles. 
Available on contract: see Glass 51, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
SODIU:,'! ARSENITS 
Sodium arsenite is used in the prepara- 
tion of poison baits for ants, grasshoppers, 
and in livestock dips. A 10 percent solution 
is used for controlling termites in the soil 
about the foi.mdations of buildings. 
Chemically, sodium arsenite (NaAsOo) 
is a white powder and very soluble o It 
is more generally available in liquid form 
containing about 32 percent .Is^Oo, although 
it can also be purchased as a powder. It 
is used also as a weed killer, as an anti- 
septic, and for dyeing purposes. 
Caution : Like all other materials 
containing arsenic, sodium arsenite is poison- 
ous and care must be exercised in handling it. 
Care must be taken not to use it in locations 
near wells or springs used for drinking pur- 
poses. Children should not be allowed to play 
in soil treated with this chemical. Sodium 
arsenite in solution is very caustic to the 
skin and rubberized gloves should be worn 
while handling it. 
In the powder form sodium arsenite may 
be obtained in drums in carload lots at a cost 
of 7-3/4 to 9-1/2 cents per pound. 
