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90 BOTANIC PHYSICIAN. % 
im one place, till a groove is cut sufficiently deep to retain it, whet ~ 
the pin should be removed. The surgeon should now proceed to — 
finish the operation; by pressing on the instrument with moderate 
and equal firmness ; at the same time using great caution that it does 
not pass through too suddenly upon the brain, or from the unevem 
_ hess of the skull, that we do not imjure the brain on any side. For 
this purpose the instrument should be frequently taken out and the — 
depth of the cut examined with a probe, or sharp pointed quill; and 
at the same time the cut should be cleared of the particles of bone, 
and blood, and the instrument cleaned. | 
When the instrument has reached the soft substance between thé — 
two tables of the skull, the frequent cleansing of the saw becomes — 
mote necessary, as the blood and spongy bone considerably obstruct — 
the operation. After the diploe, or soft layer, is passed, caution De 
comes much more necessary ; and in proportion to the progress of ‘ 
the saw it should more “be renioved, and examinations — 
made. As soon as the probe can pass through at any part of the cut, — 
the pressure should be removed from this point. By proceeding im * 
this cautious manner, the bone soon becomes loose in different points, 
and may be easily remoyed with the forceps or the points of the two 
levers applied under it. After the piece of bone is removed, if amy 
splinters or points are found to remain, they may be taken out with 
forceps. : ees 
The depressed bone may now be elevated to its former position, 
with an elevator or lever, applied under it ; or it may be entirely re 
moved with the forceps, according as its connexion with the suf 
rounding bones is more or less broken. If, however, in consequence 
of its being still wedged in at another point, the trepan must be agai 
ae ee r perforation made, before any considerable 2 
the : eration is to remove every canse of 
a ioe the brain, we should be particularly careful that 
I periect as.we can make it before we desist. At the salle 
“These being done, the woul 
the patient laid to rest. ie 
ould be of the mildest kind, anda 
Dry lint is commonly employed; butit 
more easily removed, when thinly spre™ 
i Mies and oil ; and no detriment ensues, & 
+ With @-comnion night ¢ 
the hend tre dicssings with’ enn 
P etely removed, we eo bo 
from the operation. "Phe tc 
