A CLINICAL STUDY OF ODONTOMES. 
15 
The contents of the cysts vary from a thin limpid fluid to 
a gelatinoid mass and in color from light, pale yellow or 
red to a deep reddish-brown. They should be treated 
promptly, by a free depending opening, and after the con¬ 
tents of the cyst have escaped, the walls should be carefully 
removed, and if the fang of the tooth is not exposed, it should 
be left undisturbed, and after-treatment carried out as indi¬ 
cated above. 
Cementoma, when confined to the crown, as in Fig. 5, 
merely calls for extraction in the ordinary manner. 
The case represented in Fig. 4, however, offers some dif¬ 
ficulties. The patient was a four-year-old mare, affected since 
her second year, and the tooth, the third superior pre-molar, 
was removed by means of heavy forceps, but the animal fail¬ 
ing to recover, she was brought to us for treatment, when we 
trephined into the alveolar cavity and removed a large amount 
of detached cementum, carious bone, decaying food, etc., and 
discovered that in drawing the tooth, the bony plate had 
been badly damaged, leaving a large hole in it, as in Fig. 16, 
which failed to heal, and through which food escaped into 
the nostril during mastication, rendering the animal quite 
offensive and well nigh worthless. 
The last or fourth sub-class under Class C, that of Com¬ 
pound Follicular Odontomes, is through neglect, only incom¬ 
pletely illustrated in my collection by Figs. 6 and 7 : the first 
representing the body of the tooth, the second irregular 
masses of dentine, enamel and cementum, detached through 
suppuration or found attached to the walls of the abscess. 
The patient was a well developed high grade draft mare, 
aged four years, affected since about two years old. She 
showed at date of presentation for operation, an enormous 
enlargement of the left inferior maxilla over the region of 
the fourth molar, with an external fistula through which a 
fetid pus escaped. 
Over the region of the opposing fourth superior molar 
another swelling of great size was present, while from the 
nostril there was a free escape of a fetid, purulent discharge. 
The entire number of both superior and inferior molars of 
