558 
REMOVAL OF A TUMOUR. 
the corners. It was impossible for me to isolate the mucous mem- 
brane which covered these growths, and the tissue of which con- 
sisted of very dense fibre. The nasal fossae were laid open — that 
on the right side to the extent of five, and that on the left side to 
ten centimetres. 
The hemorrhage was not very great, and I had occasion to take 
up only two divisions of the facial and glosso-facial arteries. The 
blood from some of the minute arteries belonging to the osseous 
structure was readily stopped by means of the actual cautery at a 
white heat. 
The maxillary branches of the tri-facial — fifth — nerve were not 
wounded. 
Although the hemorrhage was not abundant, yet some of the 
blood ran into the nostrils, and thence into the trachea and bronchi, 
on account of the position in which I had been compelled to place 
the head during the operation. This annoyed the animal, and ren- 
dered the respiration somewhat laborious towards the close of the 
operation; all this, however, ceased when the horse was again 
upon his legs. 
I finished the operation by bringing together the flaps of integu- 
ment which I had preserved, and uniting them by the interrupted 
suture : this being done, the head of the animal appeared no longer 
deformed. 
The tumour weighed eighteen pounds. Its greatest diameter 
was thirty centimetres, and its smallest was twenty. It was formed 
partly of white fibrous tissue, creaking under the scalpel, exceed- 
ingly dense, and ossified at certain parts, and partly of encephaloid 
tissue, of which some masses were softened. The fibro-osseous 
tissue was principally observable on the osseous portions of the 
superior nasal bones, and where they had connexion with the parts 
beneath. In the centre of the tumour was a considerable quantity 
of fluid and coagulated blood, and some of the cavities contained a 
gelatinous substance of a clear yellow colour. 
It appeared to me probable that the original cause of the tumour 
was a fracture of the nasal bones. The tumour had developed 
itself between the ends of the fractures. In the course of its de- 
velopment it had separated these bones, the one being driven from 
within outwards, and the other very little displaced. The same, 
to a certain degree, had taken place with regard to the maxillary 
bones. 
After a fever of reaction, which might well be expected, and 
which continued four days, suppuration was established. On the 
second day the right lymphatic intermaxillary ganglions were a 
little swollen, but they soon resumed their normal state. 
