164 
TUMOURS IN THE BRAIN. 
I saw him everyday. He continued much in the same state, 
constantly turning when not occupied with eating, or en- 
tangled in the straw. Sometimes he would commence this 
circular movement before finishing his mouthful of hay, and 
which he held between his teeth. 
I had him killed by bleeding, and made a post-mortem 
examination immediately afterwards. Before separating the 
head from the trunk, I satisfied myself that the spinal sheath 
was not distended by serous fluid. The transparency of the 
sheath within the ataloicl occipital articulation enabled me to 
see that it contained blood. I cut through the membranes, 
and found . a large blood-coloured substance of rather soft 
consistence, surrounding the spinal marrow. A very small 
quantity of limpid fluid only flowed from the spinal sheath, 
and which was of a deeper yellow colour than normal. T 
succeeded in opening the skull without injuring the brain. 
The parietal region of the osseous cavity presented an irre- 
gular projection on the right side which was well marked, 
being elevated, and narrow at the base. I cut down the 
whole length of the dura mater, and satisfied myself that it 
strongly adhered in several places to the right cerebral 
hemisphere. The adhesion was produced by false membranes, 
which were thick in substance. The blood-coloured tumour, 
of which I have spoken, extended as far forwards as the base 
of the cerebellum. It was of recent formation. All the 
blood-vessels on the surface of the brain were greatty dis- 
tended, although the animal had been killed by bleeding. 
The brain, when completely removed from the skull, and 
examined as to its general appearance, presented nothing 
abnormal, except a very manifest fluctuation upon the lateral 
and antero-inferior parts of the cerebrum. 
The opening of the cerebral ventricles disclosed a con- 
tinuation of serious lesions ; they were greatly distended by 
a large quantity of a whitish-yellow substance, the superior 
part of which was of a gelatinous character, and contained in 
a network of membrane, the inferior being more liquid and 
very limpid. By enlarging the incision made in the ven- 
tricles a portion of this liquid flowed out ; the gelatinous 
material, however, remained fixed to the superior part of the 
cavity, being mainly composed of false membranes. 
The choroid plexus of both the right and left ventricles was 
very much diseased, and of an enormous size. These con- 
geries of vessels were closely connected by their upper sur- 
face to the inferior part of the corpus callosum, and from this 
they could not be separated without making a rent. The 
right choroid plexus- was the most bulky and adherent. It 
