FUMIGATION WITH CARBON BISULPHID 259 
pairing their edibility. All trace of the odor dis- 
appears quickly when such products are exposed to 
the air. The ordinary commercial article has a slightly 
yellowish tinge due to its impurities, which also give 
it a rank fetid odor that is extremely obnoxious. 
When an impure article is used, a slight residue may 
be left after the evaporation of the liquid. Such a 
grade will stain fabrics, and it should be poured upon 
food stuffs with care, though its vapor will do no harm. 
Liquid carbon bisulphid is not explosive, and there 
need be no fear of handling it, provided the vessels are 
perfectly tight. It should be kept where there is no 
fire in a dry place, so the cans will not rust. Carbon 
bisulphid boils at 115° F. One volume of the liquid 
is said to give 375 volumes of vapor upon evaporation. 
Properties of vapor.—Owing to its heavy properties 
the vapor of carbon bisulphid can be poured from one 
vessel to another, like water. It is 2.63 times heavier 
than air. It diffuses quite readily through the air, as 
can be perceived by its odor. It has a tendency to 
seek lower levels, and consequently will be more dense 
as it works downward. ‘This fact should be borne in 
mind, asit has an important bearing upon the applica- 
tion of this material. It is the opposite of hydrocyanic 
acid gas, which is lighter than air. Carbon bisulphid 
in both liquid and vapor form is an efficient disinfectant. 
Meats have been kept in its atmosphere for many weeks. 
The disinfectant is the same gas as is formed by burn- 
ing sulphur or brimstone. 
Inhaling the gas.—The extreme effects of the vapor 
of carbon bisulphid if inhaled are giddiness, vomiting, 
congestion, coma, and death. ‘The material can be 
