4 BULLETIN 15, U. S. DEPAETMENT OF AGRICULTURE. 
Table II. — Conditions of infestation or noninfestation of 10 packages of cereal left until 
Jan. 24, 1913. 
No. of 
pack- 
age. 
Not labeled. 
Label pasted. 
Label glued. 
9 
Infested, containing web and adults 
10 
do 
11 
do * 
12 
do 
13 
do 
14 
No infestation 
do 
15 
16 
17 
Do 
18 
Do 
The results of this experiment seem very conclusive. Figure 4 
shows the relative infestation 
on the outside and inside of 
the labeled and nonlabeled 
packages. These packages 
were all placed under the 
same conditions and given 
every chance to become 
infested. 
The thorough infesta- 
tion of nonlabeled pack- 
ages and the absence of 
infestation in the labeled 
packages clearly indicate 
the efficiency of the label in 
preventing the insects from 
entering the cartons. 
These experiments do not 
prove that insects are in- 
capable of boring into the 
carton, thus infesting the 
cereal, but they do prove 
that when placed in regions 
of severe infestation the ordinary paper carton will become infested 
while the sealed carton will not. 
WHERE INFESTATION TAKES PLACE. 
In the process of sterilization the cereal is heated to a sufficiently 
high temperature to cause the death of all insect life, but following 
this process there are several ways in which it may become infested. 
While on an elevator (see fig. 5) the cereal may be infested by eggs, 
larvse, or adults of the several insects dropping or crawling into it. 
Warehouses are usually more or less infested by insects which crawl 
around on the packages. The grocer's storeroom and shelves are also 
Fig. 4.— Results of experiments with cartons. The one on 
the left shows severe infestation; the one on the right had 
a thin label pasted on the outside and is not infested. The 
webs and adults of the infesting insects are shown on the 
outside of both cartons. (Original.) 
