506 MR. YOU ATT* S VETERINARY LECTURES. 
to be healed, leaving only a sufficient aperture for the canula. 
The French have an oval plate, of which here is an engraving, 
three or four inches long by two wide, to the inside of the lower 
part of which is affixed a canula or tube ; immediately above the 
tube is a small moveable plate in the centre of the other. When 
this plate is up, or open, the horse easily breathes through the 
aperture, but when that is closed it is immediately put to the 
test, whether the natural passage for the air has again become 
pervious, and the plate may easily be pushed up if the respiration 
should be laborious, or suffocation should threaten. The shield- 
like plate is retained in its situation by tapes. This is an un¬ 
necessarily-complicated apparatus. The simple canula will an¬ 
swer every purpose- 
Curious Case of Tracheotomy .—There is a singular but well- 
authenticated account of an operation performed by Barthelemy, 
one of the professors at the veterinary school at Alfort. There 
was great distortion of some of the rings of the trachea, and the 
animal breathed with difficulty, and became a roarer almost to 
suffocation ; she was quite useless. Tracheotomy was effected 
on the distorted rings, and a short canula introduced. The mare 
was so much relieved that she was trotted and galloped imme¬ 
diately afterwards, without the slightest distress. Six months 
afterwards she again began to roar; it seemed that the rings 
were now distorted below the former place. Barthelemy intro¬ 
duced another canula, seven inches long, and which reached be¬ 
low the new distortion. ,She was once more relieved ; she speedily 
improved in condition, and regularly drew a cabriolet at the rate 
of seven or eight miles in the hour ; and this she continued to do 
for three years, when the canula became accidentally displaced 
in the night, and she was found dead in the morning. 
Tracheotomy on other Animals .—Tracheotomy has been prac¬ 
tised with success in cattle in cases of laryngitis, to which they 
are more exposed than the horse. No case has come under my 
personal inspection, but two or three are recorded in the French 
journals, in which immediate relief was afforded, and an eventual 
cure produced. 
Once I operated on a dog with enormous tumour in the throat, 
which almost strangled the dog. The case was successful. 
I assisted Professor Mayo in performing the operation of tra¬ 
cheotomy on a rabid dog, whose respiration was peculiarly labo¬ 
rious and stertorous: it produced no effect. The difficulty of 
breathing, almost threatening suffocation, seemed not to be de¬ 
pendent on any spasm of the glottis. The peculiar, harsh, grat¬ 
ing, sound ceased; but the lungs heaved as violently as before, 
and the animal died in less than twelve hours after the operation. 
