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 
SS 
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 634 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 
