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362 DENTAL MEDICINE.
the cocaine, thus obviating the delay which occurs when a watery
solution of cocaine is allowed to diffuse throughout the tooth.
The following is the method for using vapocaine : Apply the
rubber dam and dry the cavity with hot air before applying vapo-
caine. Then place a piece of dry absorbent cotton in the cavity
and drop the vapocaine on this until thoroughly saturated. Leave
this in from two to five minutes, keeping the cotton saturated
until ready for operation. It is preferable to cover the cotton
with a piece of rubber dam in order to prevent the too rapid
evaporation of the ether. Repeated applications of the vapocaine
are made after a portion of the decayed dentine is first removed,
and during this operation, and the dentinal tubuli being free, the
vapocaine permeates the entire tooth structure. It requires a few
minutes to produce a good result. It acts quickly in some teeth,
and slowly in others. It is supposed to penetrate the dentinal
tububli chiefly by thermal energy rather than by capillary attrac-
tion, the evaporation of the ether causing pressure, which drives
The
the moisture out of the tubuli and forces the vapocaine in.
ether being evaporated by the heat of the mouth, a deposit of
cocaine remains in the tubuli, and is then dissolved by the natural
fluid of the tooth again filling the tubuli.

DENTAL FORMUL-ffi,
To Make a Solution of Hydrochlorate For Exposed Pulps,
of Cocaine. (4 per cent.) R. Cocaini hydrochloratis
R. Cocaini hydrochloratis (cryst.) gr.vj
(cryst.) gr. 18.228 Spiritus mentlijE pip. . f^j. M.
Aqu£e destillatae f^^j. M. SiGNA.—Apply on a pledget of cotton.
. . .
For Local Anesthesia.
For Painless Extraction as a Local
Dr. H. J. McKellops.
AtJcEsthetic.
R. Mur. cocaini .... gr.iss
Dr. Clyde Paine.
Spts. alcoholis . . . . ^']
R. Cocaine .... gr.xv Chloroformi ^j. M.
Glycerine . . .
Nitro glycerine . For Neuralgia and Odontalgia.
Atropia sulph.
. . gr-j R. Cocaini hydrochloratis
Carbolic acid .... gtt.iij. M. (cryst.) gr.vj.
gtt.iij.
Distilled water to make ^ ij. Menthol gr.xxx
SiGNA.—By injection hypodermically, Alcoholis q. s. ad. . . f^j. M.