CARBON TETRACHLORID IN FUMIGATION. 55 
_broides mauritanicus L.) present as larva, and the larva of the Indian- 
meal moth (Plodia interpunctella Hbn.) and of the Mediterranean 
flour moth (Hphestia kuehniella Zell.) were included, as well as adults 
of the related fig moth ( Zphestia cautella Walk.). The flour-moth and 
the fig-moth larve 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 larve of Tene- 
broides, which moved slowly when touched. Final examination 
showed: Flour-moth aduJts dead; a few examples of their larvee dead, 
but the greater number living. The Tenebroides larve were unharmed. 
The flour and grain beetles and the two grain weevils were nearly all 
living but moving their antenne 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 16a 
few of these were still moving legs or antenne slightly, but seemed 
paralyzed and not able to recover. 
Experiment No. 4.--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 (Lachymerus quadrimaculatus Fab.) was included 
inasmall sack of beans. About half the quantity of material contain- 
ing the flour-moth larvee 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 larvee moved slightly when 
touched, though they were not active. Forty-eight hours after open- 
ing all were dead except a few larve of Tenebroides. 
If the material were a cheap product it might prove a substitute for 
carbon bisulphid if used in strengths yreater 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. 
Experiment No. 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 
