38 THE BOLL WEEVIL PROBLEM. 
The connections may be of rubber tubing, but as little rubber as possible 
should be used for this apparatus, as it is affected by the vapor of the bisulphid, 
and the couplings will have to be frequently replaced. This, however, will not 
be a considerable item of expense. With the apparatus just described one 
eperator would be able to accomplish the entire work of disinfection. The 
ic. 9.— Apparatus for fumigating cotton seed in the sack. (Author's illustration.) 
amount of carbon bisulphid recommended is about 1 ounce for each 3-bushel 
sack. It is safe to say that this can be secured for less than 1 cent per ounce 
when purchased in 25 or 50 pound lots, making the cost of bisulphid not over 
1 cent per sack. As it requires but from two to three minutes to vaporize 1 
ounce of the liquid in the manner described, the expense for labor in application 
would not amount to one-half a cent per sack. Fumigation with carbon bisul- 
phid can therefore be effectively made at the slight expense of from 1 to 14 
cents per 100-pound sack. 
512 
