CENTRAL VETERINARY MEDICAL SOCIETY. 
955 
inspiration is accompanied by a dilatation of only one side of the 
glottis, the constriction occurring to the extent of the size of the 
cartilage. In the operation the horse is secured on his back, with 
the nose stretched out as far as possible, so as to render the skin 
tense and smooth over the larynx. In this position the cricoid 
ligament connecting the cricoid cartilage with the first ring of the 
trachea is extended to its full length, and a longitudinal incision 
is made in it, exposing the arytenoid cartilage. If on inspection 
one of them is found to be active, the other passive, the latter is 
to be grasped by a hook and then cut short off with a curved probe- 
pointed bistoury. The wound is treated simply, and scarcely any 
blemish results. Mr. Hunting quoted an instance of the opera¬ 
tion which he witnessed, and it was successful. 
Mr. Field,'jun. (London), said the operation was simple 
enough, but in three cases in which he had resorted to it no 
beneficial results had accrued. The ulterior results most to be 
feared were granulations from the sides of the wounded cartilage. 
Mr. Wragg (London) asked if climate had any influence in 
the production of roaring, as he understood that it was unknown 
in Australia. His statement was negatived by Mr. Fursden (a 
visitor), who had driven a roarer when at Melbourne. 
Mr. Burrell knew of horses that were altogether incapable of 
work from being affected w r ith roaring. ITe considered the 
disease to be due to long-continued excitation of the muscles of 
the larynx, in some cases associated with temporary derangement 
of the heart's action. He quoted an instance of its sudden 
appearance in a horse w T hich was worked three days after a sudden 
fall in a mews. 
Mr. A. Mavor considered that the whole respiratory system 
was implicated in the disease. 
Mr. Blunting, in reviewing the observations made, remarked on 
the circumstances under wdiich we meet with cases of roaring, they 
being more frequently noticed in making examinations for sound¬ 
ness than in the treatment of disease. He related a case which 
was due to a pedunculated tumour in the larynx. Referring to 
the operation described in his paper, he stated that the subject 
wdiich he had seen operated on died, and it w r as found that the 
membrane of the larynx was thickened, and by accident the vocal 
cord had been divided, thus further enlarging the passage. 
The President, in concluding, observed that if both cartilages 
were removed there would be a risk of the horse being choked, in 
consequence of the passage of food into the trachea; at the same 
time he thought that the removal of one could hardly alter the 
noise. 
The President announced that the ballot which had been taken 
during the evening for the election of Captain Benjamin Russell 
