MILLS AND OTHER BUILDINGS 1590 
to be forced to concede that the flour moth or weevil 
is the fittest thing in existence, but some millers have 
actually been forced to abandon their mills on account 
of these inse¢t foes. 
Necessary preparations.—In fumigating a mill, ele- 
vator, warehouse or other enclosure containing stored 
grain or manufactured produé¢ts, several things are to 
be taken into consideration. 
1. The nature of the structure has a great deal to 
do with the effectiveness of the remedy. As the gas is 
lighter than air and very penetrating, it would soon 
escape and lose its deadly effect upon animal life in a 
building more or less open. 
2. The weather conditions have to be considered. 
It is not desirable under any circumstances to fumi- 
gate an enclosure when the wind is blowing. A calm, 
quiet day or night should be selected for the work. 
3. The building should be made practically gas- 
tight by closing up all the cracks and external open- 
ings. ‘This can be done best by pasting strips of ordi- 
nary paper over the cracks. Special attention should 
be given to windows and doors, and they should be 
thoroughly secured before the gas is generated. 
4. There should be no lights or fire in the build- 
ing while it is filled with gas. It is non-explosive 
when used according to normal dose; but to preclude 
possible accident it is best to be on the safe side, thus 
this suggestion. 
5. In a mill all machines, chests, spouts, eleva- 
tors, elevator legs, bins, barrels, boxes, etc., should 
be opened, and all unnecessary material should be 
removed and burned before the chemicals are placed. 
