CHAPTER XXI 
FUMIGATION WITH CARBON BISULPHID 
HE fact that carbon bisulphid volatilizes readily, 
has fumes heavier than air, creates an atmos- 
GYAN} phere in which no animal life can exist, and 
can be used without injury to edible materials, 
all combine to make it one of the very best substances 
for the destruction of certain subterranean insects and 
other undesirable animals. For killing insect pests in 
stored grains and other materials in bulk it has no 
superior. Its vapor will penetrate to the lowermost 
cracks and crevices in a granery, carrying the death- 
dealing atmosphere with it. it can be used economic- 
ally where hydrocyanic acid gas cannot be employed 
on account of its heavy vapor. 
First use of carbon bisulphid to destroy inseéts.— 
During 1856 and 1857 M. Doyere used carbon bisul- 
phid as an insecticide. He demonstrated that it coulc 
be used to destroy weevils and other pests in corn and 
barley without injuring the grain either for planting 
or edible purposes. Since that time it has been used 
for combatting various insect pests. At first the cost 
of carbon bisulphid precluded its general use as an 
insecticide on a very extensive scale. Largely through 
the efforts and inventive genius of Edward R. Taylor, 
a manufacturing chemist, a grade known as ‘“‘ Fuma 
carbon bisulphid’’ was placed upon the market a few 
years ago. It is now the standard for insecticide pur- 
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