THE COMMON BEDBUG 121 



very young) were placed in a similar box and then carefully 

 wrapped in two folds of a thick comfortable. 



3. Three bugs (two adults and one one-third grown) 

 were placed in a similar box and carefully wrapped in 

 cotton-batting to the depth of two inches. 



4. Two bugs (one adult and one two-thirds grown) 

 were placed in a similar box and wrapped in two folds of a 

 thick woolen blanket. 



5. Six bugs were put in a vial 3^ inches deep and one 

 inch in diameter, and the latter stopped with an inch cork 

 which had been punched twice with a pair of dissecting- 

 forceps with curved points. The holes thus made had 

 apparently closed up, owing to the spongy nature of the 

 cork, but it was found afterwards that air could be 

 readily forced through them by placing the cork be- 

 tween one's lips. 



6. To serve as checks several bugs in perforated boxes 

 were placed about the room at different heights from the 

 floor. 



In every box of bugs wrapped in different materials 

 several new-laid eggs were placed to determine the effect 

 of the gas upon the hatching of the same. 



The room in which the fumigation was done measured 

 14 X 8 X 8, and contained 896 cubic feet. We used 10 

 ounces of cyanide, 300 cc. of acid and 600 cc. of water, 

 allowing the room to remain closed 14 hours. We made 

 a slight mistake in our computation, and used 1 ounce 

 more of cyanide than our formula called for. 



The result was surprising and very gratifying. Every 

 bedbug in every case was killed. 



The fumigation was done June 1st, and up to June 

 12th, none of the eggs showed any signs of hatching. 



