252 
PROF. P. J. CADIOT. 
the clinic for a discharge from the left nostril of two months’ 
standing. This discharge was thick, grnmelous, offensive and 
dirtying to an extreme the left nostril. There was a small mul- 
tilocnlar gland on the left side of the intermaxillary space, not 
adherent. The external plate of the sinus was slightly bulging, 
painful to pressure, and dull to percussion. We diagnosed a 
purulent collection of the sinuses. The animal was left for treat¬ 
ment. After trephining, we were surprised to find the mucous 
membrane of the inferior maxillary sinus thick and infiltrated. 
The finger, introduced in the cavity, discovered that it was cov¬ 
ered with a large number of soft, spherical, somewhat confluent 
tumors. The mucous membrane of the frontal and superior 
maxillary sinus was thickened by the inflammatory process, but 
was free from the lesions found in the other sinus. The teeth 
were normal, the maxillary bone was not involved and the sep¬ 
tum that separates the two maxillary sinuses was intact. 
Trephining over again in another spot, I then cut through 
one of the tumors with the bistoury and allowed the escape of a 
thick viscous fluid. The case was one of a cyst, developed in 
the mucous membrane, probably at the expense of some of its 
glands. 
After washing the sinuses, I enlarged the opening of the in¬ 
ferior maxillary sinus, removed the mucous membrane entirely, 
cauterized the surface with the thermo-cautery, and then treated 
the horse as one affected with simple purulent collection of the 
sinuses ; daily washing of the cavities with a slightly antiseptic 
solution, and afterwards astringent solutions. The drain tube 
was removed after a month, a tent of oakum introduced into the 
trephined part to prevent too rapid closing. The animal was 
submitted to light work, and two weeks later was entirely re¬ 
covered. 
Mucous cysts of the sinuses are rare. This is the only case 
I have seen in fifteen years’ experience, and few others are re¬ 
corded. 
Not less rare are the dental cysts , of which Liautard gives the 
following interesting example : After an attack of influenza a 
