DESCRIPTION OP AN INVERTED TOOTH. 59 



in the case under consideration, I believe the 

 early conditions to have been similar to those 

 which obtain in the vesicular enlargement con- 

 nected with the eruption of the temporary teeth. 

 The fluid which collected was similar in character; 

 but while, in the one case, a ready means of escape 

 was afforded by irruption through the gum, in 

 the other, the collection was bounded by the tooth 

 above and the jaw below, and its escape conse- 

 quently prevented. As the fluid increased in 

 quantity, the adjacent bone was absorbed, and 

 thus made way for the increasing cyst. Coin- 

 cident with the absorption within, new bone was 

 developed on the outer surface of the jaw, until 

 the jaw at the point corresponding to the disease 

 became greatly enlarged. The fluid was let out 

 by a minute puncture, which rapidly healed; it 

 was again let out by a similarly small aperture; 

 the cyst inflamed and secreted pus, which oozed 

 out through the opening; the tooth was then 

 removed, and free egress given to the pus, and 

 the patiently rapidly recovered. The case, in 

 fact, passed through similar conditions to those 

 which accompany the formation of vesicular swell- 

 ing in connection with temporary teeth subsequent 

 to the development of the enamel, the differences 

 consisting rather in the severity than in the 

 character of the symptoms. But had these con- 

 ditions arisen in connection with a tooth buried 

 deep within the substance of the jaw, and un- 



