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BROMIDE OF ETHYL. 393

mends grinding ofF the point of the tube with a corundum or
carborundum disk about one-fourth of an inch further toward
the end, in order that the jet of vapor may be so attenuated by
escaping from a smaller orifice that it will not flood the cavity
before it volatilizes fast enough. Chloride of ethyl is also
employed for the relief of neuralgia by directing the vapor along
the track of the affected nerve ; also for diagnosing peripheral
from centric neuralgias by applying the vapor at the point of
irritation—if the neuralgia results from peripheral irritation the
pain will cease at once ; and intermittent applications, continued
for from twenty to thirty minutes, are often curative when the
irritation is not due to exposure of the pulp. Chloride of ethyl
may also be employed for opening alveolar abscesses, removing
tumors of the mouth, and in other painful affections of the oral
cavity. Prof. C. Redard suggests that in the extraction of teeth
in the lower jaw the vapor or stream be directed externally
against the cheek, over the inferior maxillary nerve; while in
the extraction of teeth from the upper jaw it be directed in front
of the ear at the exit of the trigerminal nerve. When applied to
a part chloride of ethyl first causes a hyperemia, then pallor, and
gradually the part assumes a parchment-like appearance. From
one to two minutes is gradually required, and the anaesthesia
lasts as long again. It has been suggested to occasionally
combine the action of chloride of ethyl with that of cocaine.
Jnestile is a mixture of ethyl and methyl chloride and acts in
the same manner as chloride of ethyl. (See Coryl.^
ETHYL BROMIDUM—BROMIDE OF ETHYL.
HYDROBROMIC ETHER.
Formula.—CgHjBr. Sp. gr. 1.420.
Derivation.—Bromide of Ethyl is obtained from bromide of
potassium, sulphuric acid, alcohol and water, by distillation, and
is re-distilled by chloride of calcium. It is a colorless and very
volatile liquid, boiling at 40° C, heavier than water, and pos-
sesses an agreeable ethereal odor, and a pungent taste, strong and
sweetish, with a somewhat burning after-taste. It is readily
soluble in alcohol arid ether, and but sparingly soluble in water.