WEST OF SCOTLAND VETERINARY ASSOCIATION. 59 7 
of the eye, or at the fountain-head of vision, namely, the 
nates and testes. 
“ Thus, then, we can account for the loss of vision. And 
wherein consists the difficulty in determining the seat of the 
tumour, when, as anatomists and physiologists, we know 
that the optic nerves bifurcate and pass to opposite sides of 
the head? Hence, if the animal is blind of the right eye, 
the diseased action must have its seat in the left side of the 
brain. 
“ And now, in conclusion, and as tending to give more force 
to the remarks already made, that anatomy and physiology 
are the keys to sound and rational practice, I may tell you 
that the animal, whose histoVy I have hurriedly pourtrayed, 
died in three weeks from my first seeing her; all treatment 
having been abandoned from that day. On a post-mortem 
examination being made, I found the abdominal and thoracic 
viscera to be perfectly healthy. On carefully removing the 
external cranial bones, nothing abnormal was presented to 
the eye ; but on passing the hand over the external surface of 
the left cerebral hemisphere, I distinctly felt something move 
under the finger. The meningeal coverings were perfectly 
healthy, but the left cerebral convolutions,, and left side of 
the corpus callosum, was thinned away to about the thick- 
ness of a worn sixpenny-piece. On laying these aside, an 
encysted fibrous tumour made its appearance, about the size 
of a large goose-egg. Within the cyst, which was of re- 
markable thickness and strength, was a quantity of fibrine in 
the form of a ball, around which was much healthy pus. 
“The pus I allowed to.escape, but the cyst, with the fibrine 
in situ , may be seen in the museum of our College, and is 
worthy of inspection ; as I understand from Professor Dick, 
and also those who have seen it, that it is the largest that 
has ever been removed from the brain of the ox tribe.” 
After Mr. M f Call had read his paper, Mr. Alex. Robin- 
son , of Greenock, said that, although he did* not want 
to produce an argumentative discussion on the subject, he 
would state a case which he had treated, in which the symp- 
toms bore some analogy to the one described by Professor 
M‘Call, a short consideration of which might be of benefit 
to the members of the Society present. 
Some time ago he was castrating a colt for a gentleman, 
and having finished the operation, he was shown a filly 
having a tumour on her abdomen about the size of a pear, 
and being requested to treat it, he immediately excised -it, 
closing the wound in the skin with two or three stitches in 
the usual manner, and left instructions for after treatment. 
The day after he was requested to go and see the filly, as 
xxxi. 79 
