A CLINICAL STUDY OF ODONTOMES. 
3 
this form of odontome, which—as we will note later—seems to 
have consisted primarily of an aberration of the enamal 
organ. 
As is apparently the case in man, so in the horse, it is 
found that a large proportion of odontomes belong to the 
second class of Dr. Sutton—Aberrations of the Follicle. 
Under this, the first sub-class, or Follicular Cysts , forms 
quite a large proportion of the total number of odontomes, 
and are frequently met with in practice, but consisting only 
of a delicate sac, filled with serum, no illustration by specimen 
is practicable. 
The second sub-class, Fibrous Odontomes , I have not ob¬ 
served. This is probably due to the fact that, as appears to 
be the case in man, this aberration of development occurs for 
the most part in patients affected with rickets, a disease 
which has not been closely studied in the horse. 
The third sub-class, Cement omata, is well illustrated by 
Figs. 4 and 5, which show large tumors of cementum. 
The fourth sub-class is not so well represented in mv collec¬ 
tion, owing to carelessness in preserving specimens, for this 
form of odontome is quite common in practice and constitutes 
probably the most serious of all forms to the health of the 
animal. It is very well illustrated, however, in Figs. 6 and 7. 
Under Class C, Aberrations of the Papilla, we find but one 
sub-class, Radicular Odontomes , which we find nicely illustra¬ 
ted in Figs. 8, 9, 10, n, 12 and 13. 
In class D we again find but one sub-class, Composite Odon¬ 
tomes, which is well illustrated in Fig. 14. 
Although these classes and sub-classes may pass one into 
another by imperceptible gradations, yet the classification is 
of great importance and may prove in many instance of value 
as a guide to the veterinarian, by affording an intelligent basis 
for action. 
Supposing that each of you has given Dr. r Sutton’s valu¬ 
able paper the careful study it so richly deserves, and fully 
understand his classification as outlined above, we will now 
attempt to resume the subject at the point where he dropped 
it, and using this for a basis, and our clinical experience as 
