SPINAL MARROW OF THE SHEEP. 
21 
raised from the surface by a large hydatid hanging out of the 
cranium, which I did not extract, being persuaded that it would 
entirely disengage itself. From this time the sheep became 
more lively, ate with avidity, and showed no signs of vertigo. 
Indeed we began to entertain hopes of its recovery, when on the 
12th day, in the afternoon, it was found dead, without having 
evinced any change in the course of that day preparing us for 
such an event. 
Examination, Within the substance of the left hemisphere 
of the cerebrum, over the lateral ventricle, was found a cyst, 
from which issued about a dram of whitish matter at the point 
touched by the cautery: the parietes of this cyst were thick, 
exteriorly almost fibrous, with an internal surface rendered ru¬ 
gose by several little white concretions, very hard and to ap¬ 
pearance osseous; the surface also displayed numerous small 
injected vessels; and the portions of brain contiguous to the cyst 
were observed to be softened. On the right side, the hydatid 
had grown between the layers of the dura mater. The frontal 
sinuses contained some larva of the oestrus ovis. Death ap¬ 
peared to be attributable to the matter secreted within the cyst: 
would this have followed the use of the trepanning awl or nee¬ 
dle, instead of employing cauterization? In answer, I cannot 
venture any opinion: I used the cautery in compliance with 
the praises that have been bestowed upon it; and even if I had 
completely succeeded I should but have preserved a hectic 
animal still requiring for his restoration more pains than he 
was worth. The sheep tormented by hydatids are not in ge¬ 
neral the finest of the flock, their growth being impeded by the 
disorder itself; on which account these very animals are deserv¬ 
edly rejected, be they ever so precious: which furnishes an 
additional reason for not breeding from weakly and blemished 
individuals. Let us conclude then from these reflections:— 
1st, That it is almost always advisable to slaughter sheep 
showing symptoms of vertigo proceeding from cerebral hyda¬ 
tids ; 
. 2dly, That in case we should be desirous to submit them to 
treatment, it is expedient to study the symptoms more particu¬ 
larly, in order that we might be able to determine from repeat¬ 
ed observation the part of the brain compressed by the worm, 
and therefrom operate prior to the irreparable injury of the organ; 
3dly, That we should draw comparisons between the different 
modes of operating ; 
^thly. That the general management of the sheep in health, 
tending to prevent such maladies, is of great importance ; -and 
