Circular 21 - Insecticides and Subsidiary Materials 81 
Vinegar is obtained at all grocery 
stores in almost any quantity desired. 
Available on contract: see Class 56, 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
WASH BIG SODA • 
Washing soda finds useful application 
in connection with large-scale fumigation 
operations, where generators are set in a wash- 
tub of water containing a few handfuls of the 
material. This precaution provides for catch- 
ing and neutralizing small quantities of the 
acid-water mixture that may leak out of the 
generator or barrel. It is also used for 
cleaning garbage of grease and fats to prevent 
breedin.^ of flies. 
"o 
Washing soda, sal soda, or alkali 
(Na2COo.lOH20) , known chemically as sodium 
carbonate, is a white, crystalline powder 
which is very soluble in water. It is also 
used as a cleaning and bleaching agent for 
laundry purposes, in the glass and soap 
industries, and in medicine. 
This soda is marketed in 200- to 400- 
pound slack barrels, 1 to 4OO pound burlap 
bags and 100-pound paper bags. In carload lots 
of 100-pound bags the price varies from i^l.lO 
to $3.25 per 100 pounds, depending upon the zone . 
Available on contract: see Class 51 > 
General Schedule of Supplies, Procurement 
Division, Treasury Department. 
