14 - FARMERS’ BULLETIN 658, 
the roaches and all other vermin will unquestionably have been de- 
stroyed. In the use of this substance it must be always borne in mind 
that it is violently explosive in the presence of fire, and every possible 
precaution should be taken to see that no fire is in or about the premises 
during the treatment. It is also deadly to higher animals, and com- 
partments should be thoroughly aired after fumigation. 
Pyrethrum fumes.—A safer remedy of the same nature consists in 
burning pyrethrum in the infested apartment. The smoke and vapors 
generated by the burning of this insecticide are often more effective 
in destroying roaches than the application of the substance in the 
ordinary way as a powder. ‘There is no attendant danger of explo- 
sion, and the only precaution necessary is to see that the room is 
kept tightly closed for from 6 to 12 hours. 
TRAPPING. 
Various forms of traps have been very successfully employed in 
England and on the Continent of Europe as a means of collecting and 
destroying roaches. These devices are all so constructed that the 
roaches may easily get into them and can not afterwards escape. 
The destruction of the roaches is effected either by the liquid into 
which they fall or by dousing them with hot water. <A few of the 
common forms of traps and the methods of using them are here 
described. 
A French trap consists of a box containing an attractive bait, the 
cover of which is replaced by four glass plates inclined toward the cen- 
ter. The roaches fall from the covering glasses into the box and are 
unable to escape. A similar trap used in England is described by 
Westwood. It consists of a small wooden box in which a circular hole 
is cut in the top and fitted with a glass ring, so that it is impossible 
for the roaches to escape. This trap is baited nightly, and the catch 
thrown each morning into boiling water. 
A simpler form of trap, which the late I’. C. Pratt reported as being 
very successfully used in London, England, consists of any deep vessel 
or jar, against which a number of sticks are placed, and bent over so 
that they project into the interior of the vessel for a few inches. The 
vessel is partially filled with stale beer or ale, a liquid for which 
roaches seem to have a special fondness. In the morning these 
vessels are found charged with great quantities of dead and dying 
roaches, which have climbed up the inclined sticks and slipped off 
into the vessel. This last method has given fairly successful results 
against the Oriental roach in Washington, but against the more 
wary and active Croton bug it is comparatively worthless. 
A simple and practical method of trapping roaches in large numbers 
was devised by a correspondent in Brockton, Mass. He took several 
tin bread pans with nearly vertical sides about 3 inches in height, 
