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370 DENTAL MEDICINE.

an eschar; it is, however, more powerful than chloride of ethyl,
and produces a deeper state of insensibility. It is as inflammable
as chloride of ethyl, and boils at 32° F. Coryl will produce
complete anaesthesia in 15 to 20 seconds; and to apply it the
patient is directed to breathe by the nose, and not by the mouth
;
he must then rinse his mouth with water at the temperature of
the room ; the gum must be dried and the jet of coryl applied to
the mucous membrane below the crown of the tooth to be ex-
tracted. Beginning at the apex of the root and carrying the jet
upward toward the neck of the tooth, then over the crown, and
down on the inner side of the alveolus up to the end of the root,
then coming back again over the same parts, and repeating this
for 15 or 20 seconds, when the anaesthesia will be found
complete. To obtain a deeper and more prolonged state of
insensibility, as soon as a first application of the coryl is made,
the mouth must be quickly rinsed with water; then another
application is made, followed by another rinsing of the mouth,
and finally a third application, when the anaesthesia will be found
to last over 40 minutes.

CREASOTUM—CREASOTE.
Specific Gravity: 1. 08.
Derivation.— Creasote is a product of the distillation of wood-
tar, and is a mixture of several phenols, such as carbolic acid,
creasol, CgHi^Og, and cresylol, C^pHgO. Its name is derived
from the Greek kpsa^, " flesh," and ffcuTrj'-^ " preserver," as
animal substances, when saturated with it, are preserved from
putrefaction. It is also obtained from crude pyroligneous acid.
When derived from wood-tar, creasote principally consists of
such phenols as guaiacol^ creasol^ methyl-creasol, and phloral.
The best form of creasote for medicinal use is made from
beech-wood.
Creasote, when fresh and pure, is a colorless, oleaginous fluid,
with a strong empyreumatic odor, resembling closely carbolic
acid, and a caustic, burning taste ; when made from beech-wood
creasote is of a reddish, amber color. After exposure, it has a
yellowish or brownish tinge. Its purity may be tested by strong