78 INSECTS AFFECTING STORED PRODUCTS. 
affected by weevils and insects of similar habits. The simplest and 
least expensive remedy consists in the establishment of a quarantine 
or fumigating building, bin, or box, to be made as nearly air tight as 
possible, in which the peas, beans, or other infested material can be 
placed as soon as harvested. After fumigation, if properly con- 
ducted, the broad beans or other material can be safely placed in 
permanent storage without danger of reinfestation from the species 
which is being considered. 
A building, box, or room of about 100 to 200 bushels capacity 
suitable for the fumigation of a quantity of beans, peas, or grain 
would contain about 500 cubic feet. A fumigator of this cubic capac- 
ity might be built 8 feet square by 8 feet in height. A good, and per- 
haps the best, preventive for the escape of the gas would be to line 
the fumigator with sheet tin, with soldered joints, and over sheath- 
ing. Another method would be to sheath the room inside, cover 
the walls, ceiling, and floor with tarred or heavy building paper, 
with the joints well lapped, and cover the inside with matched ceiling 
boards. The fumigator should always be equipped with a tight 
door, in which the joints have been broken, similar to the door of a 
refrigerator or safe, and should close with a refrigerator catch against 
a thick felt weather strip, which should render it practically gas 
tight. Thus constructed it would furnish sufficient space for the 
fumigation of about 200 bushels of seed material. There would also 
be sufficient space for the application and diffusion of the carbon 
bisulphid from the top with a charge of more than necessary for the 
amount of seed treated. 
It is highly desirable to have this fumigating building isolated, 
because of the danger in the use of bisulphid of carbon, its inflammabil- 
ity, and liability to affect live stock. The writer has had personal 
experience with several such fumigators in Washington, D. C., and 
with one in Chicago years ago. The latter was constructed from an 
iron boiler and was fitted with a metallic door similar to those used 
in large bank safes. In this fumigator the writer was successful in 
destroying weevils and other insects in stored grains in 24 hours, using 
it at the minimum rate of 1 pound to 1,000 cubic feet of airspace. In 
his experience in the use of more loosely constructed fumigators and 
other containers, peas, beans, and other useful legumes can be satis- 
factorily fumigated even more easily than can stored cereals. In 
recent experiments, in specially prepared fumigators which we are 
now using, it was found best to use 2 pounds to 1,000 cubic feet of 
air space. It is much better, also, to fumigate at a comparatively 
high temperature than at a low one, and an exposure of from 36 to 48 
hours is better than one of 24 hours. After constructing a fumigator 
on the lines which have been indicated, the operator will be able to 
determine the best quantity of insecticide and the length of exposure 
