98 



SOUNDNESS IN HOKSES. 



sometimes find, especially in the upper jaw, an abnormally 

 large number of permanent incisor teeth in the same 

 mouth. In such cases, they form a more or less complete 

 second row to the ordinary teeth, and follow the same 

 method of dentition, being either front, middle, or corner 

 incisors. They are entirely different from the stumps 

 of milk-teeth that are sometimes retained. They are 

 inserted, more or less, firmly in the jaw, and interfere, to 

 a greater or less degree, with the ordinary teeth. The 

 existence of complete double rows of permanent incisors 

 in both jaws — making twenty-four in all — have been 

 noted in two or three instances. 



In Fig. 20, we have both front incisors, and one middle 

 incisor, double. 



Fig. 20. — Supernumerary incisors. — aa, two front, h, one middle. 



