68 
W. L. WILLIAMS. 
The cyst was thick-walled and quite firm ; it was quite 
free from surrounding' parts except inferiorly, where the 
irregular mass of enamel was found, and as far as possible it 
was removed by gently withdrawing it by means of heavy 
dressing forceps. 
The outside of the cyst was smooth and covered with 
mucous membrane, while the inner side was thickly studded 
throughout, except at point where enamel was found, with 
numberless rough pyramidal elevations one-quarter to one-half 
inch in diameter and one-eighth to one-quarter inch from base 
to apex, and formed of cementum, Fig. 14c. 
After removal of the cyst the sensory branch of the fifth 
nerve was seen to be wholly denuded of its bony conduit, 
through the encroachment of the cyst, and remained loosely 
stretched across the large cyst-cavity, entirely bare and very 
sensitive. An accidental wound to this before its identity had 
been made out occasioned much pain and this, with the ex¬ 
posed condition of the nerve, rendered the animal quite sen¬ 
sitive and troublesome in dressing afterwards. 
The same line of after-treatment as described in preced¬ 
ing cases was followed, resulting in prompt improvement, 
healthy granulations appearing over the entire extent of the 
cavity in a few days. In about a week the walls ot the cavity 
were rapidly approaching their normal position, the dyspnoea 
was almost wholly relieved, the outward bulging of the face 
greatly diminished and on the twelfth day after admission she 
was discharged apparently on the safe road to recovery. Six 
weeks later her owner reported her practically well, and a 
year later the blemish could scarcely be noticed, except on 
close inspection ; the filly having made an excellent growth. 
While selecting this series of cases primarily to illustrate 
their classification and treatment, a careful study of them 
will indicate some of the leading errors and accidents likely to 
occur and assist us in formulating some general rules as a 
basis for action : 
1. When an odontome is recognized, no unnecessary de¬ 
lay should be countenanced by the veterinarian, but prompt 
surgical treatment advised, since early treatment, aside from 
