CARBON TKTRACHLOHIIjE 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 can 

 be made at least fairly air tight. Pour out the carbon bisulphide in 

 onf; 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 

 canvas thrown over the top of the box will assist in retaining the 

 fumes. 1)0 not allou) 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. Xo 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 . . 2 pounds to each 100 cubic 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 culjic feet of space or each 100 bushels of grain. In small 

 quantities use 4 drams to each cubic foot or each bushel of grain. 



