-16- 
KOHN-ABREST, E. (60) 
Precis dc toxicologic, 388 pp., illus. Paris. 1934. 
Methyl bromide is four times as toxic as carbon tetrachloride 
(p. 83). ' 
LANGE, W. H. , jr. (61) 
Tests with methyl bromide as a fumigant for larvae of the arti- 
- choke plume moth. Jour. Econ. Ent. 32: 66-69. 1940. 
Plat yptilia carduidactyla (Riley) is controlled with minimum 
plant injury by a dosage in vacuo of 1 pound per 1,000 cubic feet. 
The temperature should be 22.2° to 24.4° C. and the exposure 2 to 
2.5 hours. Treatment at atmospheric pressure increases plant 
injury. 
LATTA, R. (62) 
Methyl bromide fumigation for destruction of pod-borer larvae. 
Jour. Eccn, Ent. 33: 176-179. 1940. 
Doses as lev.' as 0.5 pound per 1,000 cubic foot produced com- 
plete mortality of Maruca tcstulalis Gcycr, in 2 hours at tempera- 
tures above 21 ° C . at ~a!5mc spheric pressure, or in 90 minutes at a 
15-inch vacuum. Low temperatures required higher doses. For com- 
mercial atmospheric fumigation 1.5 pounds per 1,000 cubic feet for 
2 hours is advised (temperature 21°). Green lima beans, string 
beans, and pigeon peas arc not injured by doses necessary to kill 
the larvae of this insect. 
LE G0UPIL, (63) 
Les proprictc's insecticides du brcmure dc methyle. Rev. de Path. 
Vc'g. et d'Ent. Agr. dc France. 19: 169-172. 1932. 
In studies of vacuum fumigation with various substances, 
methyl bromide, which was originally used in combination with in- 
flammable liquid fumigant s to reduce the danger of fire, was fourld 
to possess a much higher specific toxicity than the fumigants with 
which it was mixed. Further tests were carried cut with methyl 
bromide alone and diluted in a liquid possessing slight insoctici- 
dal properties, such as carbon tetrachloride. Sitophilus granaria 
(L.) was chosen as the test insect on account of its resistance to 
insecticides. A few other species, notably Triboli um, wcro also 
used. The time cf exposure was 1 l/2 hours in every case, but tho 
dose ranged from 2 tc 13.5 ounces per 100 cubic foot. The insects 
were treated both isolated in vitro and buried in various types of 
commodities, in dry atmospheres as well as in varying degrees of 
moisture, in the presence of rags soaked in oil, and at tempera- 
tures from 15° to 26° C. With doses below 3.5 ounces some insects 
wore still alive when they wore withdrawn from the autoclave, but 
all succumbed within a few hours. Larvae, pupae, and adults still 
inside unsplit grains wore reached just as effectively as those 
developing between the grains, and it is probable that the eggs 
were also destroyed. lUcthyl bromide is toxic to man only in very 
largo doses, and since it is very volatile and soluble in v\ratcr, 
it is easily eliminated from fumigated commodities. It is uninflam- 
mable under all conditions and can be used to reduce the danger of 
