-15- 
appear only after several days. Some residual neurasthenia was 
observed. A few experiments with animals are described. 
J0ACHH10GLU, G. (55) 
'Toxikologischc Botrachtungcn ubcr einige moderne Fcucrloschmittcl. 
Dcut. Med. Wchnschr. 56: 785-787. 1930. 
Methyl bromide is much mere toxic than carbon tetrachloride. 
Concentrations as low as 0,00009 mole per liter were fatal to 
dogs upon prolonged exposure. The- animals displayed lung edema 
and finally died after severe dyspnea. 
JOHNSON, A, C. (56) 
A low-cost water seal fumigatcr. TJ. S„ Bur. Ent. and Plant Quar. 
ET-154, 2 pp., illus. '1940. [Processed.] 
Directions are given for the construction of a water-sealed 
fumigator from a 50-gallon oil drum. Carbon disulfide and methyl 
bromide have- been used in this fumi gator. 
JOHNSON, V, A. (57) 
Fumigating with hydrocyanic acid and methyl bromide. U. S. Patent 
2,147,947, Feb. 21, 1939. 
For destroying living organisms such as Japanese beetles, 1 
ounce of hydrogen cyanide and G ounces of methyl bromide are used 
per 1,000 cubic feet of space. Such a mixture has a mutual syner- 
gistic action. 
JONES, R. M. (58) 
Toxicity of methyl formate, ethylene oxide and methyl bromide, in 
admixture with carbon dioxide, to the rust-red flour beetle. 
Iowa State Col. Jour. Sci. 13: 73-74. 1938. 
The maximum insecticidal effects of methyl formate, ethylene 
oxide, and methyl bromide against Triboliu m castaneum (Hbst.) 
wore obtained with concentrations of 40, 60, and 20 percent, res- 
pectively, of carbon dioxide. Increase of carbon dioxide may de- 
crease the effectiveness. 
(59) 
the red flour 
beetle. Jour. Econ, Ent. 31: 298-309. 1938. 
Toxicity of funigant-carb n dioxide mixtures to the red flour 
The toxicity of methyl formate, methyl bromide, and ethylene 
oxide, alone and in mixture with various concentrations of carbon 
dioxide, was studied with Tribolium cas taneum (Hbst.) as test in- 
sect. The toxicity of these fumi gants may be markedly increased 
by the addition of ccrtaiii percentages of oarbon dioxide. The 
stimulative effect of carbon dioxide is considerably more pronounced 
with methyl formate and ethylene oxide than with methyl bromide. 
Maximum efficiency cf methyl formate, cthylonc oxide, and mothyl 
bromide is obtained with approximately 40, 20 and 10 percent cT car- 
bon dioxide, respectively. 
