THE TOBACCO BEETLE. 51 
be easily destroyed at such times by brushing them down into pans 
of water or oil, or onto sheets of sticky fly paper. In a tobacco ware- 
house visited by the writer the owners make it part of the regular 
duties of the watchman to visit each window in the building where 
the beetles collect and sweep them down on sheets of fly paper spread 
out on the window sills. Immense numbers of the beetles are de- 
stroyed in this way at very little cost. 
COLLECTING BEETLES BY SUCTION. 
The use of suction fans operated at lights for collecting the beetles 
in warehouses has been reported. There has been no opportunity to 
lig. 14.—Suction fan used for collecting adults of the tobacco beetle in a tobacco ware- 
house. 
test this method. The use of vacuum cleaners operated by electric 
current might possibly prove to be an effective method of collect- 
ing beetles at the windows of warehouses. At Lancaster, Pa., a suc- 
tion fan was used in one of the large tobacco warehouses. Beetles 
could be readily drawn from cracks in the building and from about 
windows, and large numbers were said to have been collected in a 
short time on several occasions. A photograph of the apparatus 
used is shown in figure 14. 
OTHER REMEDIES. 
EXPOSURE TO VACUUM. 
In 1912, a series of experiments were made at Clarksville, Tenn., 
by Mr. A. C. Morgan and the writer to ascertain the effect of treating 
infested tobacco in vacuum. With the apparatus used, a vacuum of 
about 28.5 inches could be readily obtained. When the air in the 
vacuum chamber was exhausted the beetles became inactive, but after 
exposures varying from 1 to 24 hours they again became active when 
normal air pressure was restored. In some of the experiments a few 
adults were killed. The eggs hatched normally after exposure. 
While the experiments with vacuum apparatus alone from a practical 
