15 
jar, care being taken that there is no danger of their dropping into 
the generator prematurely. A small wire hook attached to the end 
of each cord can be used, but if the string is tied firmly around the 
neck of the sack it causes less trouble and is quite as secure. The 
cords may be so arranged that the cyanid can all be lowered into 
the jars by one motion. The entire process is well shown by the 
accompanying illustration (fig. 5). 
A more detailed description of the ‘‘stringing”’ process, by which 
many bags of cyanid may be lowered into the generators, would 
require too much space for treatment here. The operator, if he 
chooses this method, may use his own devices. Pulleys and screw 
Fic. 5.—Method of stringing a room for fumigating with hydrocyanic-acid gas. (Original.) 
* 
eyes are practically necessary in the application of the ‘*stringing”’ 
method. 
The method is much used in greenhouse work and is desirable for 
small buildings. This process of ‘‘stringing’’ the building would 
scarcely be found profitable for mills or dwellings, but in greenhouse 
work fumigation is frequently done every week or two and often 
several times a week, and the equipment of screw eyes, pulleys, etc., 
can remain in place almost indefinitely. 
Signs should be placed on the doors of thé building that is being 
fumigated, warning passers-by of the danger, e. g., ““Danger!”’ 
“Hydrocyanic-acid gas!” “Poison!” The building must, of course, 
‘be vacated and neighbors warned of the nature of the operation. 
[Cir. 112] 
