66 
TUMOUR IN THE VENTRICLE OF THE BRAIN. 
opaque, from deposition on its surfaces, which were also 
covered with flocculi of lymph. Upon the upper surface of 
the fore part of the anterior lobe of the right hemisphere of 
the cerebrum, there were several dark red spots, apparently 
the result of extravasated blood in the structure of the 
pia mater. In other respects the outer surface of the brain 
looked as though it had been soddened in a fluid. It was 
of a lightish gray-colour, the grayness apparently resulting 
from a precipitation upon its surface of that which rendered 
the fluid, before alluded to, turbid. 
We now removed the brain from out the cranial cavity, 
and in doing so were particularly struck with the large capa¬ 
city of the right olfactory fossa, and the immense size of 
the right olfactory bulb, this being enormously distended 
with fluid, which partly escaped in removing the organ. 
We next opened the lateral ventricles, which we found to be 
filled with fluid of a similar character to that existing in 
the arachnoidean spaces. The plexuses choroides were thick¬ 
ened by interstitial deposition, and by flocculi of lymph on 
their surfaces. The foramen of communication between the 
anterior cornua of the right ventricle and the olfactory bulb 
was very large, as was also the bulb itself, which, as we have 
before stated, was distended with fluid. The substance of 
the brain when cut into had a woolly, or perhaps it may be 
better expressed by the term, a leathery condition. Some 
of the large blood-vessels in the structure of the brain 
were distended with blood; not so, however, the smaller 
ones, as the brain generally was paler than natural. The 
third and fourth ventricles gave evidence of being similarly 
distended with fluid, and their plexuses of blood-vessels were 
thickened from the same cause as those of the lateral ventri¬ 
cles. We next examined the spinal canal, and found the 
theca vertebralis distended with fluid, which, however, was 
not so turbid as that found in the cranium. When this was 
exposed to the atmosphere for a short time, it became par¬ 
tially coagulated. 
A peculiarity in the bones of the head still requires to be 
noticed, as their alteration, consequent upon pressure, indi¬ 
cated that morbid action must have been in existence for 
a long time—but how long, it is impossible to say. The 
olfactory fossa, or that portion of the cranial cavity in 
which the olfactory bulb is lodged, was more than as large 
again as the opposite one. The cribriform plate had become 
detached from the neck of the bone, and with the cells was 
pushed in an upward and outward direction, so as to occupy 
a part of the frontal sinus. The depressed portion of the 
