172 FUMIGATION METHODS 



of the gas was quite, noticeable twelve feet away 

 from the mill, although every precaution had been 

 taken to close all the cracks by pasting strips of 

 paper around the window-sash and door-frames, and 

 otherwise making the mill as tight as possible. We 

 opened the building at 9 o'clock Monday morning 

 and could not detect more than the faintest odor of 

 the gas. A careful examination showed the floor 

 plentifully sprinkled with moths, flies, spiders, and 

 occasionally a mouse or two. We examined care- 

 fully for the grubs or larvae and found plenty of them 

 dead, and but two or three alive in a mass of flour, 

 but these were not by any means lively. We have 

 watched carefully ever since, over two months, and 

 have seen only an occasional moth. We believe it 

 is impossible to find a moth in our two buildings 

 to-day. 



We are delighted with the results of this gas. In 

 our case it has certainly been a decided success. We 

 would say to any one intending to use it they should 

 take every precaution to have the manila bags of good 

 quality. The cyanide of potassium liquidizes after 

 being placed in the bags and exposed to the air. It is 

 apt to drop into the solution by the bag becoming wet 

 and tearing at the bottom before the strings are ready 

 to be cut. In conclusion, we wish to express our 

 hearty appreciation of your painstaking care in the 

 instructions of the use of this gas and also for your 

 personal letters to us with regard to certain particulars. 



The following report is from a Western miller : 

 After carefully reading your instructions and closely 

 following them, we fumigated a i5o-barrel mill with 



