MILLS AND OTHER BUILDINGS 159 



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 insect foes. 



Necessary preparations. In fumigating a mill, ele- 

 vator, warehouse or other enclosure containing stored 

 grain or manufactured products, 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. 



