164 



FUMIGATION METHODS 



the ceiling or woodwork to the door or stairway lead- 

 ing out of the room, as shown in Fig. 74. 



The screw-eyes should be firmly secured, and only 

 strings of good quality used. The bags of cyanide 

 should be thoroughly fastened and suspended over the 



FIG. 74 DIAGRAM SHOWING THE INTERIOR ARRANGEMENT OF 

 AN ENCLOSURE READY FOR FUMIGATION 



vessels before the acid and water are placed in them. 

 A small wire hook, as shown in the figure, can 

 be used, but a string tied firmly around the neck of 

 the sack is less trouble and more secure. With each 

 three-pound bag of cyanide use 4^ pounds, liquid 

 measure, sulphuric acid, and 6^ pounds water. 



The operator should begin on the top floor, lower 

 the cyanide into the jars containing the acid and 

 water, quickly close the door or other opening, and 



