72 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 larvee 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 150-barrel mill with 
