FUMIGANTS. 



24 CARBON BISULFID. 



Evaporate one pound of carbon bisultid to every thousand cubic 

 feet of space. This is done by pouring the bisulfid into shallow 

 dishes placed in the upper part of the place to be fumigated, and 

 closing everything tightly and leaving 24 hours. Then open, air for 

 ten minutes before entering or using anything which has been fumi- 

 gated. This treatment is effective for infested grain, weevily seed, 

 clothes moths, carpet beetles, etc., in closets, trunks, tight boxes or 

 wherever these substances are kept or in which they may be placed 

 for treatment. Caution : Do not use carbon bisulfid near a fire, 

 or where there is much heat, as it takes fire easily, even from a 

 lighted pipe or cigar. 



25 HYDROCYANIC ACID. 



For Nursery Stock. 



Potassic cyanid (98 or 99^). 



Sulfuric acid (1.83 sp. gr. commercial). 



Water. 

 Multiply the number of cubic feet to be fumigated, by .2 or .25, 

 giving the number of grams of cyanid needed for the house or box ; 

 divide the answer by 28.35, &'^'"S the weight of the cyanid in 

 ounces. Take twice as many fiuid ounces of acid and four times as 

 many fluid ounces of water as was taken in ounces by weight of the 

 cyanid. Mix the water and acid in an earthern or granite-ware jar, 

 then by loose bag and string drop in the cyanid after tightly closing 

 the place to be fumigated. Leave closed 40 minutes, then open 

 from the outside and air for at least ten minutes before entering. 



26 HYDROCYANIC ACID. 



For Empty Houses. 

 Potassic cyanid (98 or 997f) i oz. per 100 cu. ft. 

 Sulfuric acid (1.83 sp. gr. commercial), 2 fluid oz. 



per 100 cu. ft. 

 Water, 4 fluid oz. per 100 cu. ft. 

 Mix as directed under Number 25. 



