CAKBON TETKACHLOKID IN FUMIGATION. 55 
oroides mauritanicus L.) present as larva, and the larva of the Indian- 
meal moth (Plodia interpimctella Hbn.) and of the Mediterranean 
flour moth (Ephestia huehniella Zell.) were included, as well as adults 
of the related fig moth {Ephestia cautella Walk.). The flour-moth and 
the fiof-moth larvae were working- in a small mass of bran and flour 
well matted with silk. The quantity of material was about 1 pound, 
loosely inclosed in a cheesecloth bag. 
The fumigating box was closed at 3 p. m. October 6, and calked 
around the edges of the lid with cotton wadding. After being closed 
for half an hour no escape of fumes could be noticed. The box was 
opened at 3.30 p. m. October 7. The fumes of the tetrachlorid were 
very strong; hence the escape of fumes must have been slight. 
The material was all taken out and exposed in the fresh air in the 
outside insectary until the following day, but immediate superficial 
examination showed all insects motionless except the larvae of Tene- 
broides, which moved slowly when touched. Final examination 
showed: Flour-moth adults dead; a few examples of their larvae dead, 
but the greater number living. The Tenebroides larvae were unharmed. 
The flour and grain beetles and the two grain weevils were nearly all 
living but moving their antennae or legs very feebly, seeming to be in 
a paralyzed condition. Numerous examples were placed in a vial with 
a small amount of flour and stoppered with cotton. On October 16 a 
few of these were still moving legs or antennae slightly, but seemed 
paralyzed and not able to recover. 
Experiment No. J^. — This was a repetition of No. 3 in most of the 
details, except that 10 pounds to 1,000 cubic feet were used. The four- 
spotted bean weevil (Fachymerus quadrimaculatus Fab.) was included 
in a small sack of beans. About half the quantity of material contain- 
ing the flour-moth larvae was taken. 
The box was closed at 3 p. m. and carefully calked with cotton. 
October 17, at 3 p. m., or 24 hours later, the box was opened and the 
contents freely exposed to the air. All of the bean weevils and other 
beetles seemed to be dead, but the cadelle larvae moved slightly when 
touched, though they were not active. Forty-eight hours after open- 
ing all were dead except a few larvae of Tenebroides. 
If the material were a cheap product it might prove a substitute for 
carbon bisulphid if used in strengths greater than 10 pounds to 1,000 
cubic feet. Possibly fumigation for a longer time might increase the 
effectiveness, but it is most obviously not so fatal as is carbon bisulphid. 
EXPERIMENTS AT BALTIMORE, MD. 
Expedient JVo. 5. — October 25, 1910, a quantity of shelled corn 
stored in a new concrete elevator in Baltimore, Md., was reported by 
Dr. J. W. T. Duvel, of the Bureau of Plant Industry, to be quite 
badly attacked by weevils which had worked to such an extent that 
