INVOLUNTARY SHAKING OF THE HEAD. 
325 
of dorsal side of the levator muscle we wounded the facial ves¬ 
sels, which with the animal in the lateral recumbent position, 
bled freely, obscured our operation field, caused us to miss some 
dorsal twigs of the nerve, and predisposed the wounds to infec¬ 
tion, owing to the resulting blood clots. By making the in¬ 
cision on.the ventral side of the muscle, wounding the facial 
vessels is difficult to prevent. 
The wounds were injured and infected from contact with 
the leathern halter which was kept on throughout the opera¬ 
tion. The result was severe wound infection, which delayed 
recovery, while the missing of a part of the nerve made our 
results imperfect and unsatisfactory, though there was a decided 
amelioration of symptoms. 
The last two cases operated upon according to the tech¬ 
nique above suggested were successful from both operative and 
curative standpoints. With complete anaesthesia, maintained 
throughout, the animal shows no nervousness from recollection 
of pain, while the quietness of the patient aids in securing asepsis. 
Operating along the dorsal rather than the ventral side of 
the levator muscle insures more fully the division of the dorsal 
branches of the nerve, and while division of the ventral parts 
may not be essential we believe it absolutely necessary to divide 
the dorsal twigs. 
Our first, third and fourth cases recovered from the malady 
immediately and completely and the results have so far been un¬ 
affected by time. 
As already stated, the third case was unsatisfactory, no doubt 
lue to faulty operation, but even this one is distinctly improved 
md the betterment seems inclined to progress rather than 
'etrograde. 
We believe a second, corrected operation would cure. The 
deration will probably prove more free from nutritive disturb¬ 
ances of the enervated parts than observed after neurectomv of 
he feet and limbs. 
. ^ lllls far no indication of unfavorable sequelae of either nu- 
ntive, sensory or motor functions have been observed. 
