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MICRODINE.
461
an ethereal odor, and under the name of methyl-ethylic ether^ it
has been used as a general anaesthetic. The methylic ether is
prepared for use as methyl-ethylic ether by frequent washings in
a strong solution of potassa, and is afterwards dissolved in abso-
lute ethylic ether. In order that it may be fit for use, it is
necessary to keep it for some time securely stopped.
Dental Uses.—According to Dr. B. W. Richardson, of Eng-
land, methylic ether is a superior anaesthetic for dental operations
—better, he says, than nitrous oxide gas, because it allows air to
be given with it, and does not asphyxiate nor produce muscular
spasms and syncope. Under its influence, the patient is in a
state of semi-consciousness, but is not conscious of pain from
an operation.
MICROCIDIN—MICROCIDINE.
Derivation.—Microcidin is a combination of naphthol and
soda. Naphthol 25 per cent, and sodium naphtholate per
75
cent., one part being soluble in three parts of water. Micro-
cidine does not corrode instruments or dressing materials, and is
without odor or taste.
Medical Properties and Therapeutic Uses.—Microcidin has a
very feeble toxicity, is caustic in large quantities, but in me-
dicinal doses, 'even the largest required, is not irritating when ap-
plied to wounds as an antiseptic and disinfectant ; it may also be
used for toilet purposes. It reduces fever rapidly, and is excreted
by the urine, which is rendered aseptic. It has been employed
successfully in a large number of cases of infected and operative
wounds. It is used in aqueous solution in the strength of 5 to
1000 (strong solution) and 3 to lOOO.
Dental Uses.—As an antiseptic and disinfectant, microcidin
may be employed in dental practice on gangrenous pulps, carious
cavities in pulp canals, and wounds and ulcers of mucous mem-
brane ; and as a disinfectant and antiseptic generally.
MORPHINA- MORPHINE.
Formula.—C^.H^.'NO.-hH^O.
Derivation.— Morphine is the alkaloid which constitutes the
chief narcotic principle of opium, the proportion varying from