TO DESTROY INSECTS IN STORED GRAIN. 
(Prof. Howard Evarts Weed, Mississippi Experiment Station.) 
Although corn and other grain is at times severely injured in 
the field by many insects, it is attacked by even more injurious 
species when in the granary. The application of various remedies 
will greatly lessen the damage done by insects to grain in the field. 
These remedies consist of the application of insecticides, rotation of 
crops, clean culture, and the planting of trap crops. For the insects 
ill the granary, however, theie is but one remedy, and this remedy 
is so good, simple and perfect, that no other is needed or indeed 
wanted. This remedy consists in the application of Bisulfide of 
Carbon to the stored grain. Properly speaking, it is a preventive to 
insect injury rather than a remedy, since it prevents further damage 
to the grain by killing the insects which infest it. 
But before describing details as to the application of the Bisul- 
fide of Carbon, perhaps it will be best to first consider the manner 
in which insects infesting grain do their work. Although there are 
many species of insects which infest stored grain, yet their life- 
history and manner of work are essentially the same, so that we 
may take only one as an example of all. Thus we may consider the 
black weevil, which probably is the species doing the most damage 
to corn throughout the Southern States, while a near related species 
does the greatest damage in the Northern States. The life-history 
of the black weevil is as follows : 
The eggs are laid by the female weevils at the soft part of the 
kernels near the cob, and in. a few days these eggs hatch into small 
wrinkled larvae which feed wi'.hin the kernels. At a in the accom- 
panying figure is shown the larva much enlarged. The larvae feed 
for about four weeks when they are ready to form pupa?, which they 
do within the kernels. A pupa is shown at 6 in the illustration, and 
as may be seen from this figure jt presents nearly the same outline 
as the mature weevil, excepting that the wings are folded around 
and under the body. In about ten days the pupae change into the 
weevils, one of them being shown much enlarged at c. The weevil 
is so familiar that no description is necessary here, the principal point 
being the 
REMEDY FOR STORED GRAIN INSECTS. 
This, as already stp*ed, consists in the application of Bisulfide 
of Carbon. This substance is a liquid and of a volatile nature. It 
kills by means of its deadly fumes, and on this account is an excel- 
lent insecticide for use against insects confined within something 
where the insects cannot be reached by the ordinary insecticides, 
such as Paris green and the like. The fumes of the Bisulfide arc 
heavier than air, and the best mode of application is simply to pour 
