366 DISEASE OF MEMBRANES COVERING BRAIN OF A DOG. 
guide. The owner was asked if the animal had ever received 
a blow upon the head, and in reply he stated that he had 
reason to believe he had met with some injury in the stable, 
he thought from one of the horses. The owner had had the 
dog examined at Oxford, and afterwards brought him to 
London for our opinion. After the examination we felt 
satisfied that the dog was suffering from some diseased con- 
dition of the brain, and that his loss of vision was due to this 
cause. It was noticed that the dog was steady and cautious 
in his movements, turning neither to the right nor to the 
left, yet he seemed perfectly obedient to his master's call. 
For the purpose of treatment the dog was removed to our 
infirmary, and general depletive measures were used at first ; 
mild doses of aperient medicine were given occasionally, and 
some improvement appeared to be produced, as the animal 
could, after a time, see with the left eye; he recognised his 
feeder, and ran after a cat that accidentally got into his box. 
This was so far satisfactory, as indicating that his sight had 
partially returned ; he ate his food and took fluids freely, but 
on the 15th inst., after his meal, he vomited and seemed 
much prostrated. The attendant desired us to look at him, 
as he thought he was considerably worse ; he was found lying 
on his left side, with the head protruded and the nose point- 
ing upwards. There was a rigid condition of the muscles of 
the neck, the pulsation of the heart was feeble, and it was 
apparent that the animal's end was approaching. He died 
at five o'clock p=m. 
Post-mortem examination . — On removing the calvarium, it 
was apparent that effusion had taken place into that part of 
the arachnoid sac which is reflected over the left hemisphere ; 
a slight puncture, made by the saw while the bone was being 
removed, was followed by the forcible expulsion of pus-like 
fluid. The dura mater was dark red in colour, and came 
away from the bone very easily ; the inner surface of the 
portion under which the effusion had occurred was covered 
with a soft pulpy mass of pus and recently exuded fibrin, 
which also was spread over the surface of the hemisphere. 
This portion of the brain was somewhat diminished in bulk, 
but no morbid appearances were observed in its structure ; in 
the centre of the substance of the left corpus striatum a recent 
haemorrhagic clot was found. 
Under the microscope the exudation was found to consist 
of ordinary inflammatory products, numerous pus corpuscles, 
large exudation corpuscles, fat granules, and fine white fibres. 
Altogether the case appears to possess many points of 
pathological and physiological interest. 
