576 
MR. YOUATT S VETERINARY LECTURES. 
decisive practice, I am disposed to attribute it to partial com¬ 
pression of the brain from some other cause. 
Turnsick in the Dog. —I turn, however, to another of our 
patients, and there I have more frequent illustration of the effect 
of this partial pressure. A dog is listless, dull, and off his food, 
for two or three days; then an apparent stupidity creeps upon 
him; he scarcely recognizes any surrounding object; he has no 
lit, but he commences this roundabout way of rambling. He 
forms comparatively larger circles than the ox; the area of the 
room alone bounds his wanderings, and often, for hours together, 
he will describe these circles, and alw r ays the same direction, and 
generally with his head on one side. At first he will carefully 
avoid the obstacles in his way; but by degrees his sense of 
vision becomes lost, and his mental faculties impaired, and then 
he blunders against everything. 
This Complaint uniformly fatal .— I have resorted to every 
remedial measure which the case could suggest. I have bled, 
and physicked, and setoned, and blistered, and used the nioxa, 
but all without avail, for in not a single case have I been suc¬ 
cessful. You may suppose that I have lost no opportunity of 
post-mortem examination. In some cases I have found spiculse 
projecting from the inner plate of the skull, and pressing upon, 
and even penetrating, the dura mater. I know not why the dog 
should be more subject to these irregularities of cranial surface 
than any of our other patients, but decidedly he is so; and where 
these irregularities have pressed, there has always been injection 
of the membranes, and sometimes effusion between them. At 
other times I have found effusion without this external pressure; 
occasionally, distention of the lateral ventricles by serous fluid; 
and, in some cases, but comparatively few r , there has not been 
any perceptible lesion : in no instance, however, have I met with 
an hydatid or any thing that could possibly be mistaken for one. 
Singular Instance of Compression on the Brain oj the Horse .— 
There is no well-authenticated account of the existence of an 
hydatid in the cranial cavity of the horse ; but cysts containing 
a fluid, sometimes serous and pellucid, at other times of a yellow 
colour and a viscid character, have occasionally been found, and 
they have produced many of the symptoms that I have just de¬ 
scribed. The most satisfactory one that I know is recorded in 
the Journal Theorique et Pratique for July, in the last year. It 
was communicated by M. Leloir. A horse w r as wounded by a 
bullet in the superior part of the shoulder, six inches below the 
withers. He was taken to the infirmary at Alfort, and cured ; but 
in the spring of 1815, 1816, and 1817, there appeared, a little 
below the cicatrix, a small tumour which suppurated, buist, and 
