280 FUMIGATION METHODS 
the bugs to their destruction till Monday morning. 
Then open doors and windows, and thoroughly venti- 
late before going to work.’’ 
The vapor of carbon bisulphid takes fire in air at 
about 300° F. and burns with a faint blue flame, diff- 
cultly visible in daylight, but evolving. considerable 
heat and decomposing the carbon bisulphid into carbon 
dioxide (CO,) and sulphur dioxide (SO,). The latter 
is the familiar gas given off by the burning of sulphur 
matches and is a strongly poisonous, suffocating gas 
which should not be inhaled. Carbon bisulphid vapor 
mixed with three times its volume of oxygen, or an 
amount of air containing that amount of oxygen, forms 
a mixture which is very highly explosive upon ignition. 
As 21 percent. of the air is oxygen, one volume of 
liquid carbon bisulphid evaporated in 5,357 volumes of 
air would form such a mixture. An atmosphere com- 
posed of one volume of carbon bisulphid vapor to 
approximately 14.3 volumes of air is liable to violent 
explosion in the presence of fire of any kind whatever, 
or a tenfperature of about 300° F. without flame. We 
have here about the maximum danger-point from 
explosion in the use of carbon bisulphid. 
Exterminating the flour moth.—My experience with 
the Mediterranean flour moth is of nearly seven years’ 
standing. Until I took charge of my mill six years 
ago I had never seen nor heard of the insect, and when 
I found it here and learned what it was I doubted 
whether such a delicate little creature could do any 
more harm than a house-fly. I soon had evidence, 
however, of its capacity for mischief. For one day it 
