vm, D, 1 Jones: The Cigarette Beetle 17 



DIRECTIONS FOR USING CARBON BISULPHIDE 



Fumigation is a simple process when the cubic contents of 

 the fumigating compartment are known. Place the desired 

 amount of leaf tobacco on the shelves, and for each cubic meter 

 use at least 32 grams of the fumigant. Pour the liquid into 

 shallow dishes, place the latter on the top shelf of the fumigating 

 compartment, and close the door. After submitting the tobacco 

 to the fumes of this gas for a period of at least twenty-four 

 hours, the door may be opened and a current of air directed 

 into the compartment in order to drive out residue fumes, before 

 any person is allowed to enter. In all cases the fumigating 

 compartment should contain its full capacity of tobacco, as the 

 amount of carbon bisulphide used would necessarily have to 

 be the same whether the compartment were full or only partly so. 

 Treated tobacco should be taken directly to the working room 

 in quantities large enough for only one-half day's work, and 

 after the cigars are made they should be placed immediately in 

 a screened drying and selecting room. 



When not in use, the fumigating compartment should be kept 

 closed to prevent reinfestation, and tobacco taken out should be 

 returned to the compartment only for refumigation. 



Precautions to be observed in the use of carbon bisulphide are 

 as follows: 



1. Carbon bisulphide is extremely explosive, and no sparks should come 

 in contact with the fumes. 



2. The gas is poisonous, and should not be inhaled. 



3. Carbon bisulphide should be stored in a cool, dark place in glass- 

 stoppered bottles or original drums. 



HYDROCYANIC-ACID GAS 



In order to generate a maximum ^^ amount of hydrocyanic-acid 

 gas, potassium cyanide, 98 per cent pure, commercial sulphuric 

 acid, 93 per cent pure, and water should be mixed in the following 

 proportions. 



Potassium cyanide, 98 per cent 30 grams. 



Sulphuric acid, commercial, 93 per cent 30 c. c. 

 Water 60 c. c. 



These amounts will give the required quantity of hydrocyanic- 

 acid gas for each cubic meter of the fumigation compartment. 



"Bull U. S. Dept. Agr., Bur. Ent. (1911), 90, Pt. 1. 



114710 2 



