11 
writes after treatment of the mill : “1hie Monday followiiyi^' ''' 
we cleaned out everythin^- thoroughly, and at that time found just one 
live moth. ''' We are well |)leased with the result of fumiga- 
tion, and have nothing to regret except the fact that we did not go at it 
four years ago.” 
Another: “Have used this method in onr mills for the last four or 
five years, and find it very satisfactory, especially when care is taken in 
making proper pre])arations.” 
( )ne of the best proofs of the efficacy of this method was shown in 
the fact of a very badly infested Illinois mill remaining absolutely free 
of the moth for fourteen months after being fumigated, at which time 
the mill was closed l^ecanse of the owner giving up the 1)iisiness. This 
can mean but one thing, namely, that every stage of the Hour moth in 
that mill, including the eggs, was killed by the process. 
A miller must not ex])ect, ho\vever, that one treatment will neces- 
sarily eradicate all and every pest in the mill : figuring the amount re- 
quired may not have been accurate, or the mill may not have been 
properly cleaned beforehand; or it may become re-infested from some 
source. A few of our mill pests do not yield readily to this treatment, 
which is so efficacious against the flour moth. Fortunately they are not 
insects which are particularly troublesome. We frequently find some 
of the little red beetles. Hour beetles, and sometimes erroneously called 
‘‘weevils” alive in a mill after fumigation ; the same is true of the fiat- 
tish, yellowish brown “worms” ( meal worms ) which later turn into 
black beetles. These two pests are apt to bury themselves in inaccess- 
ible places, and in the midst of fine stufif, therel)v precluding the ])OS- 
sibility of the gas reaching them. However, these insects are of minute 
importance com])ared with the Hour moth, against which this |)rocess 
is es|)ecially directed. 
A few observations made in the course of our work, and certain 
precautions may well be given here for the information of millers. 
1. WTc of lumps of cyanide makes but little difference, except that 
the pieces, as shown in the illustration, Fig. i, are of convenient si.ee for 
doing up in bags, that is, the corners do not push through the paper as 
readily as do the corners of large pieees. 
2. FI ot and cool acid appear to act zvith equal rapidity upon the 
uneoz'ered eyanide, but the temperature of the liquid makes a great dif- 
fcre}ice in the matter of penetrating a double paper sack — the cooler 
liquid penetrating the paper much more slozviy. 
