71.2 
TUMOUR IN THE BRAIN OF A HORSE. 
briefly suggested to their fullest extent, would show the 
mutual dependence these two sciences, viz., physiology and 
pathology, have upon each other in affording explanations of 
normal or abnormal phenomena. 
In the case now under consideration the only part of the 
brain which was primarily, or at any time during the develop¬ 
ment of the tumour, affected, was the posterior lobe of the 
left hemisphere of the cerebrum; secondarily, other parts 
doubtlessly became involved. The thalamus opticus of the 
same side was visibly diminished in size, and other parts 
of the brain might have been structurally involved, but could 
not be detected by the unaided eye. There was not the 
slightest evidence that the cerebellum had in any way suf¬ 
fered from the pressure of the tumour. 
The facts developed by the post-mortem examination, to 
be of any practical use, should correspond, to a certain extent, 
with the symptoms observed previous to death, or otherwise 
a knowledge of their existence would be of no avail in 
diagnosing similar cases, or, on the other hand, at arriving 
at correct physiological inferences. 
They are, however, of great use, and the value of making 
post-mortem examinations, and faithfully recording the morbid 
changes, together with the symptoms observed before death, 
must be apparent to every one who takes an interest in such 
matters. 
We will briefly review the symptoms of this case, as 
described by Mr. Toll, the most prominent of which, during 
the first eighteen or twenty days, were stupor , extreme 
dulness, and a disposition to turn to one side only. The 
first two of these symptoms, with that of forcing the 
head persistently against the manger or wall, might be un¬ 
derstood as indicative of functional derangement of the brain, 
arising from chronic indigestion ( <f stomach staggers”); but 
when we take into consideration the peculiar symptom of 
turning only on one side, we are at once drawn to the 
brain itself; and from that symptom alone would be dis¬ 
posed to view the disease as organic in its nature. The 
torpid state of the horse’s bowels, and the difficulty of their 
being acted on, even by large doses of cathartic medicine, 
are quite diagnostic of cerebral disturbance. 
The case is even more interesting to the veterinary patho¬ 
logist, and its physiological bearing more apparent, when 
placed in juxtaposition with the following. A few years ago 
a friend of mine, Mr. T. W. (lowing, of Camden Town, 
published a case in the Veterinary Record of a horse, in 
which a tumour of a similar character projected into the 
