Page 423 - My FlipBook

LOCAL ANESTHESIA. 419

upon the skill and tact of the operator, and the sus-
ceptibility of the parts. In patients of full habit and
active circulation, it is very difficult to produce insen-
sibility by congelation ; and in such cases great pain
usually attends its application.
Congelation is now far more easily, and efficiently

accomplished by the use of ether spray, than by the
process just described. So easy of application is it,
and so generally efficient, that it is in almost uni-
versal use. To Dr. Richardson, of London, is due
the credit of having brought this process to its pre-
sent state of perfection.
So accurately does the accompanying engraving

Fig. 86.

(Fig, 86) represent the apparatus used in this process,
that a minute description is unnecessary. The mode

of application and operation is apparent at once.
The instrument consists of the fluid holder—a four
ounce bottle, graduated—the bellows consisting of a