CARBON TETRACHLORIDE 81 
and at higher temperatures one half to three fourths of the above 
will suffice. 
Place the material to be treated in a box, barrel, or bin that ean 
be made at least fairly air tight. Pour out the carbon bisulphide in 
one or more shallow dishes, and place on top of the materials. Put 
on the cover at once, and leave for twenty-four hours. Blankets or 
ranvas thrown over the top of the box will assist in retaining the 
fumes. Do not allow any fire, or even a lighted cigar, anywhere near 
at the time of fumigating or for a period after, until the fumes have 
disappeared. 
Use reasonable care not to breathe the fumes too much or too long 
at a time, as they will be apt to cause headache or illness. No in- 
convenience should be experienced if ordinary care is exercised. 
If large amounts of grain are being fumigated, it is best to intro- 
duce some of the liquid to the middle layer of the heap instead of 
putting all on top. To do this, fit a round stick loosely in a section of 
small iron pipe. Leaving the stick in the pipe, shove it down through 
the grain. Then withdraw the stick, and pour the desired amount 
of the carbon bisulphide down the pipe. The stick merely serves to 
keep the grain from filling the pipe when it is shoved down into the 
heap. After being fumigated, the grain should be shoveled over, so 
as to help remove the gas remaining in it. 
Carbon Tetrachloride 
Carbon tetrachloride . 3 2 pounds to each 100 cubie feet 
A substitute for carbon bisulphide is found in carbon tetrachloride. 
It has the advantage of being nonexplosive, and therefore may be 
preferred in fumigating bins in a house or barn, or wherever there is 
possible danger of fire. It is not as active as carbon bisulphide, and 
will not kill insects as readily. 
The proper strength to use is 2 pounds of carbon tetrachloride for 
each 100 cubic feet of space or each 100 bushels of grain. In small 
quantities use 4 drams to each cubic foot or each bushel of grain. 
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