710 
TUMOUR IN THE BRAIN OF A HORSE. 
for more than a week, feeding during the time equally as 
well as any horse could be wished to do in health. He like¬ 
wise was able to take some exercise every day, and although 
his illness lasted a month, he did not loose much flesh. 
To what can the formation of the abscess be attributed ? 
Could it have resulted from the exposure to wet and cold, 
as spoken of by the waggoner? 
OBSERVATIONS ON THE ABOVE CASE, BY PROEESSOR 
VARNELL. 
The roof of the skull had been removed, and the brain 
partly exposed previous to the specimen coming into my pos¬ 
session, in the doing of which the encephaloid membranes were 
considerably torn. The cranial portion of the head had also 
been separated from the facial by a transverse section, which 
unfortunately had been made so near to the cranial cavity 
that the olfactory bulbs were cut through, thereby allowing 
any fluid which might have been contained in the lateral 
ventricles to escape, a free communication existing between 
the lateral ventricles and the interior of the olfactory bulbs, 
which is seldom alluded to by anatomists. 
The brain was first carefully taken out of the cranium, but 
from its disorganized condition, and there being no chance of 
its being preserved as a pathological specimen, a circumstance 
much to be regretted, it was freely cut up to investigate the 
morbid changes that had taken place. 
General appearances .—The veins of the pia mater were filled 
with blood, which gave the surface of the brain a darkish 
appearance. The posterior part of the left hemisphere of the 
cerebrum, which was much sunken in, was of a dirty yellow 
or a yellowish-brown colour. It was also very soft in con¬ 
sistence. Resting upon and partly imbedded in this portion 
of the brain, was an irregular-shaped and nodulated tumour, 
as large as a moderate sized egg. The outer covering of the 
tumour was connected by continuity with the dura mater, 
and on examining its interior it was found to contain a 
quantity of coagulated blood. The tumour had either been 
accidentally opened or its outer coat had yielded to the 
pressure of its contents, which, on referring to Mr. TolPs 
description, I find occurred when he was removing the 
roof of the skull. The greater part of the dura mater, 
with the longitudinal and lateral sinuses, having been re¬ 
moved from the cranial cavity with the brain, I next pro¬ 
ceeded to detach this, by first raising the falx cerebri from the 
longitudinal fissure and the tentorium from the transverse 
