AT LYONS DURING THE SCHOLASTIC YEAR 1840-41. 191 
Neurotomy . — We have practised this operation on a mare of 
the English breed, ten years old, and whose fore-feet were con- 
tracted. The division of the posterior nerves of the left fore-foot 
was made with an interval of eight days between each side. It was 
the left fore-foot alone in which lameness appeared. That lame- 
ness immediately disappeared, to shew itself, two months after- 
wards, in the right-foot. The operation was now resorted to on 
the right side. Six months afterwards, the perfect effect of the 
second operation remained. Both feet were sound. 
Castration . — During the spring and summer we have had nu- 
merous cases of castration. In fifteen subjects the removal of the 
testicles in the uncovered way has been performed without any 
accident. The clams, armed with corrosive sublimate and lard, 
produced mortification of the vessels included in their pressure 
in two days, washing with cold water being employed, with a 
little gentle exercise, but no bleeding. The scrotum was rarely 
or very slightly swelled. 
Pathological Anatomy . — In two horses an enormous tuber- 
culous mass, situated in the abdomen, was connected not only 
with the neighbouring ganglia of the mesenteric arteries, and also 
involved the kidneys, but forced itself into the groin, and reached 
to the testicles. Its interior offered numerous soft projections, 
resembling an encephaloid mass. 
In a horse — a roarer — there existed hypertrophy and ossifica- 
tion of the arytenoid cartilages. The operation of tracheotomy 
being resorted to, the roaring ceased. 
A salivary calculus was taken from the left parotid canal of an 
entire ass. It was of a grey colour, oblong, and rounded at the 
extremities, with a surface slightly embossed, glossy and granu- 
lous in some parts. It weighed 1028 grains, being an enormous 
calculus for so small an animal. 
Some remarkable concretions of the plexus choroides were fur- 
nished by a horse that was at first attacked with staggers, to 
which paralysis succeeded. Two concretions, of the size of 
a small egg, filled the lateral ventricles. That on the left side 
was the largest. It was more than two inches and a half long, 
one and a half broad, and one in thickness. The corpus callosum 
and septum lucid ura were forced towards the left in the posterior 
part, and adhered in some places to the walls of the ventricle. 
During the latter part of the life of the animal its eyes were 
motionless, and there was also palsy of the buccinator muscles. 
A Spanish horse, seven years old, died of inflammation of the 
stomach and the brain — gastro-encephalite — after an illness of 
twenty days. The examination after death discovered some 
lesions that were not expected. During the life of the animal, 
