REMEDIES AGAINST GRAIN-MOTHS. 
507 
notched; and the wing-cases extend nearly to the hinder 
extremity. The chrysalis-skin generally remains within the 
grain when the moth comes out; in some few cases, how¬ 
ever, it was found sticking out of the orifice in the kernel, 
and sometimes in the crevices between the kernels. The 
foregoing minute description, which is taken from perfectly 
fresh and uninjured specimens, will serve to remove any 
doubt as to the genus and species to which this com-moth 
is to be referred. 
It has been proved by experience, that the ravages of the 
two kinds of grain-moths whose history has been now given 
can be effectually checked by drying the damaged grain 
in an oven or kiln; and that a heat of one hundred and 
sixtv-seven deorees, bv Fahrenheit’s thermometer, continued 
durino; twelve hours, will kill the insects in all their forms. 
Indeed, the heat may be reduced to one hundred and four 
degrees with the same effect, but the grain must then be 
exposed to it for the space of two days. Insect-mills, some¬ 
what like coffee-roasters on a large scale, have been invented 
in France, for the purpose of heating and agitating the in¬ 
fested wheat, bv which the esiis and larvm of the little 
corn-moth, or Butalis, are destroyed. Fumigation in close 
vessels, with the gas of burning charcoal, is found to be 
an effectual remedy; and Dr. Herpin states that tliis process 
neither imparts any bad flavor to the grain, nor does it 
impair its power of vegetating. He recommends also the 
early threshing and winnowing of wheat, as tending to pre¬ 
serve it.* This, indeed, is advocated by the most experi¬ 
enced wheat cultivators in this country, particularly if done 
by machinery: and it should not be deferred later than the 
end of July. The concussion and agitation undergone by 
the wheat in being threshed and winnowed, as intimated 
by Dr. Herpin, Mr. Judah, and others, is supposed to dis- 
* See Dnponchel, Ldpidopt de France, Supplem., Tom. IV. pp. 450-453; and 
Mr. Curtis’s paper in the Joum. Royal Society of Agricult, of England, yol. Vil 
pp. 87 - 89. 
