54 INSECTS AFFECTING STORED PRODUCTS. 
30 ounces or less of the liquid to 100 cubic feet were used, with a 
fumigating period of two hours. Greater quantities of the liquid 
caused injury and killed some of the trees. In these experiments the 
liquid was also volatilized by means of heated pans. In conclusion 
Dr. Britton states that in his experience it proved noninflammable, but 
that it is not very poisonous to the higher forms of animal life. 
This compound seems first to have been employed as a substitute 
for carbon bisulphid as a f umigant for structures containing grain and 
similar products infested by insects by Prof. Albert P. Morse, 
Wellesley, Mass., who published an account of the result in February, 
1910. 1 He used it against Attagenus, presumably A. piceus, as this 
is the only species of the genus commonly found in the United States. 
It was employed in a standard museum case which closed tightly, and 
the strength was 1 quart to 50 cubic feet, which Prof. Morse claims is 
only twice the strength at which carbon bisulphid is used. In prac- 
tical use, in perfectly tight inclosures, 1 pound of pure carbon bisul- 
phid to 1,000 cubic feet of space will destroy some insects, but per- 
haps not the dermestids which affect stored products. 
EXPERIMENTS AT WASHINGTON, D. C. 
Experiment No. 1. — July 27, 1908, a quantity of rye was subjected 
to treatment with carbon tetrachlorid at the rate of \\ pounds to each 
1,000 cubic feet. The grain, which was infested with the rice weeyil 
{Calandra oryza L.), the saw-toothed grain beetle {Silvanus suri- 
namensis L.), and a smaller grain beetle {Ldemophlceus minutus Oiiv.), 
was closed and left for 48 hours. It was then opened and the insects 
of the different species were found to be living and in good condi- 
tion. The experiment was therefore a failure. 
Experiment No. 2. — A similar quantity of the same grain with the 
same insects was fumigated 48 hours with carbon tetrachlorid at the 
rate of 3 pounds to 1,000 cubic feet. At the end of this time all the 
beetles present were alive and in good condition. 
In these two experiments a closed tin receptacle with air-tight top 
was used and quantities of the chemical greater than the ordinary 
amounts of carbon bisulphid for air-tight inclosures were applied. 
It seems, therefore, that the insecticidal quality of this liquid, if 
present, is decidedly less than that of carbon bisulphid. 
Experiment No. 3. — October 6, 1908, a quantity of grain practi- 
cally equivalent to that used in previous tests was subjected to treat- 
ment with carbon tetrachlorid at the rate of 6 pounds to 1,000 cubic 
feet, or double the amount used in experiment No. 2. Living speci- 
mens of the confused flour beetle {Tribolium confusum Duv.), with 
a few rust-red flour beetles (T. navale Fab.), Silvanus surinamen- 
sislu., Calandra oryza L., and C. granaria L., the cadelle (Tene- 
1 Journ. Econ. Ent., vol. 3, p. 104, 1910. 
