8 HYDROCYANIC-ACID GAS AGAINST HOUSEHOLD INSECTS. 



the sacks, these gloves to be afterwards burned. The fact that the 

 cyanid has a superfical resemblance to sugar adds to the danger of 

 keeping it about the premises, and it is much better to at once deeply 

 bury or throw down the sewer trap any left-over cyanid. 



SUMMARY OF METHOD. 



The general directions for treatment may be briefly summarized 

 as follows: 



(1) Prepare tabular statement designating room capacity and 

 amount of chemicals for each compartment, and secure the chemicals 

 and vessels for generating the gas. 



(2) Arrange for the opening of doors and windows from the out- 

 side at the conclusion of the fumigation, and close all registers, fire- 

 places, and other openings. Do necessary calking and remove carpets 

 and rugs and moist food material and any metallic objects which are 

 likely to be tarnished. 



(3) Place the generating vessels in each room with a thick carpet- 

 ing of old newspapers under each. 



(4) Break up the cyanid out of doors and place it in thin paper 

 sacks containing a pound or a half pound each, suited to the amounts 

 to be used in the different rooms. 



(5) JNIeasure into each of the generating jars the proper amount of 

 water, and afterwards add the acid slowly in the proper amount to 

 each of the jars. 



(6) Take the cyanid in bags in a basket and place the bags to the 

 proper amount alongside of the generating jars in each room. 



(7) Start at the top of the house and place the cyanid gently, so 

 as not to spatter, into each jar, and quickly leave the room. As 

 soon as the upper floor is finished go to the next lower, and pass in 

 this manner from floor to floor until the basement is reached and 

 exit is made through the lower door. If two persons Avork together 

 in this operation they should both be on the same floor together, 

 taking different rooms. 



(8) The following day, or after the completion of the fumigation, 

 open the windows and doors from the outside, and let the house 

 ventilate for an hour before entering it. 



(9) After the house is thoroughly ventilated and the odor of the 

 gas has disappeared, the jars should be emptied in a safe place, pref- 

 erabW through the sewer trap, and thoroughly and repeatedly washed 

 before being used for any household purpose. 



Approved : 



James Wilson, 



Secretary of Agriculture. 

 Washington, D. C, October 21, 1912. 



O 



