102 
W. L. WILLIAMS, 
could be readily heard more than a hundred feet away when 
foal was at rest. 
The left side of face was greatly bulged, projecting fully 
one inch farther outward from septum nasi than did the opposite 
side, the bulging being most exalted along the zygomatic ridge 
well back in the malar bone. The left air passage was wholly 
occluded, respiration being carried on through the right nostril 
and, in a measure, inspiration through the mouth. The light 
facial region exhibited normal resonance, while the occluded 
left side gave a very marked increased resonance. In the article 
cited* we casually noted that in some cases of odontomes ab¬ 
normal resonance of the affected part happened in some cases. 
A further study of the matter leads to the conclusion that, 
so soon as a follicular cyst or composite odontorne acquires 
a considerable volume within the facial sinuses and encroaches 
upon the communicating foramen between sinuses and air pas¬ 
sages, and before the cyst becomes broken down by suppurative 
process, the imprisoned residue of aid within the invaded 
sinuses is augmented in volume, and markedly compressed by 
small additions from the air passages, the return to which is 
prevented, thus producing increased resonance on the affected 
side of the face. This augmented resonance is in direct con¬ 
tradiction to the recorded observations of our writers on veter¬ 
inary surgery who hold that diseased facial sinuses show 
decreased resonance, a rule which has at times led us to trephine 
the wrong side of the face in cases of this kind. 
There was no discharge from the nose, and no odor. We at 
once diagnosed a follicular cyst, and gave a favorable prognosis. 
We trephined the face at about the union of zygomatic and 
maxillary bones in or a little inferior to the zygomatic ridge, 
and upon removing the exsected bone found the sinus fiee from 
pus or other liquid, and no apparently diseased tissue in sight. 
Directly inwards, however, and separated fiom the facial bone 
by a distance of half an inch, an apparently healthy, smooth, 
* Clinical Study of Odontomes.” —American Veterinary Review. XV. i. 
