-26- 
of Catha rtus quadricollis (*Guer.) (Silvanus gemellatus Duv. ), and 
larvae- of Tencbrio ob sou r us F, , both exposed and covered to., a 
depth of 6 inches by wheat. It was estimated that 1. pound of 
methyl bromide per 1,000 cubic feet should kill all these insects 
in 12 hours at 58°-70°~F. Lower dosages may be sufficient or 
higher ones required in practical fumigation according to the 
species concerned and the quantity and nature of the infested 
material . Sitop hilus was the most susceptible, the species being 
increasingly resistant in the order named. Under conditions in 
which all the insects were killed, the germinating powers of 
wheat, oats, corn, and beans were not affected. Immersion in 
liquid methyl bromide and exposure to its vapor did not affect 
any of nine common metals or change the color of seven wallpapers 
or nine samples of dyed cotton goods,. ¥.o ill affects were exper- 
ienced by the operators, and the fumigant was found to be nonin- 
flammable and easy to handle. 
QUAYLE, H. J. ('102) 
The development of resistance to hydrocyanic acid in certain 
scale insects. Hilgardia 11: 183-210. 1938, 
Preliminary experiments indicated that forms of Aonidiella 
aurantii (Mask.) which are resistant and nonresistant to hydro- 
cyanic acid gas differ in their reaction to methyl bromide, 
RICHARDSON, B. W. (103) 
Some further additions to therapeutics, I. Organic bromides. 
Practitioner 6: 337-345. 1871. 
Methyl bromide is mentioned as a general anesthetic, 
(104) 
Methyl-bromide. Asclepiad 8: 239-240. 1891, 
Several deaths have occurred from the use of methyl bromide as 
a general anesthetic, 
RICHERT, P. H. ('105) 
Apparatus for dispensing methyl bromide. U. S „ Patent 2,156,869. 
May 2, 1939, to Dow Chemical Co. 
Various details of valve construction, etc. are given, 
ROHRER, F. 
Ueber Brcmmethylvergiftung. ■ Ein Beitrag zur Frage der Sp'atwirk- 
ungen von Gifts toff en. Vrtljrschr. f. Gerichtl, Med, 60: 61-59. 
1920. 
A fatal case of poisoning by methyl bromide is reported. The 
patient was exposed while making repairs on a pipe carrying the 
material in a plant for the manufacture of antipyrine. There was 
a synptom-free interval of about 24 hours between exposure and the 
onset of epileptiform seizures, coma, and death. 
