118 DEXTAL XYSTS. 



ently on both sides. lu this respect clinical obsevva- 

 tion has not yielded any fact of practical importance. 



"Sometimes, after the extraction of a tooth, it hap- 

 pens that the cavity of the cyst or the bottom of the 

 fistula does not cicatrize. This is a sure indication 

 that a new tooth is forming. Rodet noted this fact as 

 long ago as 1827. Macrops has observed a case of this 

 kind. He was compelled to operate twice within three 

 months, each time removing a molar tooth; and when 

 he made his report, in 1860, it was probable that a 

 third tooth was being developed, as the fistula had not 

 closed." 



Surgeon Fleming also mentions cases that were ob- 

 served by Surgeons Perosino, Martin, Harold, Gamgee, 

 Coclet, Lafosse, and others. He continues: 



"Profs. Lanzillotti-Buonsanti and Generali made 

 minute inspection of a specimen of tooth taken from 

 the bas3 of the ear of a foal twenty months old, and 

 they report that microscopically the structure of such 

 teeth does not differ much from natural teeth. The 

 same constituents — dentine, enamel, and cement — 

 were found, the only difference being that they were 

 arranged in an unusual manner. In the tooth they 

 examined, for instance, the cement was abundant in 

 the central part, while in that studied by Oreste and, 

 Falcanlo, the dentine was most abundant and the 

 cement least in quantity." 



Surgeon Fleming next refers to and gives a sum- 

 mary of t!ie views of scientific men, who say that "A 

 certain number of teeth may sometimes be developed 

 as parasitic productions in a cavity similar to and situ- 

 ated near the mouth (in which category is included 



