60 PESCEIPTION OF AN INVERTED -TOOTH. 



connected with either of the teeth which had 

 taken their position in the series, the bone would 

 have enlarged much in the manner it is seen to 

 do in certain forms of malignant disease, and this 

 too without the presence of a tooth as a cause of 

 the disease being suspected. I am indebted to 

 Mr. Underwood for a model of a case which was 

 exhibited at one of the earlier meetings of this 

 Society. In this instance the jaw was enlarged 

 by the gradual expansion of a cyst, within which 

 a canine tooth hes horizontally near the lower 

 border of the jaw. A portion of the jaw was 

 removed, no doubt, under the impression that the 

 disease was malignant in character, and I am not 

 in a position to prove that such was not the 

 nature of the malady. But judging from the 

 appearance presented by the bone, the position 

 occupied by the tooth, and the presence of what 

 appeared to be a lining membrane within the 

 cavity upon the floor of which the tooth was 

 placed, I should be strongly disposed to think 

 that the disease resembles in its origin and pro- 

 gress that which has formed the subject of this 

 paper, and that it would have subsided had a free 

 opening been made into the cyst, and the tooth 

 removed without having recourse to so serious an 

 operation as that of excising a large portion of 

 the jaw. 



