360 MILL AND ELEVATOR INSECTS 



ciently reinfested from this source alone to need another treatment. 



The above is, in brief, the method of procedure in fumigating 

 mills for the flour moth. The gas is a safe and most efficient agent 

 when used with care by those familiar with its nature. One good 

 whiff of it, however, would probably be fatal to any human being; 

 hence, its use should never be entrusted to one not familiar with it. 



Rats or mice perish if they come in contact with the fumes. 

 Its presence can be detected even in minute quantities by the 

 odor, which is that of the kernel of peach pits. 



Opinions of Millers. The writer is in receipt of many state- 

 ments from millers testifying to the efficacy of this method; a 

 few of these are repeated here: 



From the owner of a badly infested mill: "The work seems 

 to have been a success, and we certainly could not have continued 

 running without the treatment. I have been around the mill this 

 morning, making a personal examination of the results of the work ; 

 have taken out of spouts a large amount of webbing and worms, and 

 on a careful examination do not find a single live worm or moth, 

 and some of the masses in the spouts were possibly an inch thick." 



Another mill owner, whose plant was perhaps one of the worst 

 in this connection ever seen, says: "The process seems to be a 

 most successful one where mills are infested with various pests." 



The head miller of a seriously infested milling plant in Illinois 

 writes: "The gas made a clean sweep of the flour moths in our 

 mill. I have not seen one now in two months, and am keeping a 

 sharp lookout for them all the time. This seems a remarkable 

 condition to one familiar with the premises and knowing how well 

 they were established in the mill." 



Another miller writes: "We have been using hydrocyanic acid 

 gas for a number of years with very satisfactory 'results." 



An Illinois firm writes: "The Monday after the treatment we 

 cleaned out everything thoroughly, and at that time found just 

 one live moth. . . . We are well pleased with the 

 result of fumigation, and have nothing to regret except the fact 

 that we did not go at it four years ago." 



Another: "Have used this method in our mills for the last 

 four or five years, and find it very satisfactory, especially when 

 care is taken in making proper preparations." 



One of the best proofs of the efficacy of this method was shown 

 in the fact of a very badly infested Illinois mill remaining abso- 

 lutely free of the moth for fourteen months after being fumigated, 



