74 DISEASES OP THE JAWS. 



Sometimes the upper jaw is implicated, and from a beauti- 

 ful specimen I obtained the subjoined illustration: - - 



Fig. 38. 



Symptoms. At a spot on the side of the face correspond- 

 ing to the roots of the third or fourth grinder, above or 

 below, a small, hot, circumscribed swelling occurs. The 

 animal experiences no inconvenience from it, except when 

 the part is struck or pressed upon. The tumour, however, 

 grows and pain increases. In some cases the growth is 

 rapid, and in a few months the disease has invaded the larger 

 part of one half of the upper or lower jaw, and gives rise to 

 severe symptoms, which arise chiefly from disturbed masti- 

 cation, pain, and often from various cruel methods of treat- 

 ing the disease. The teeth become loose in their sockets, 

 may be affected by caries, and drop out. Anacker says 

 that sometimes a fistula opens into the mouth. 



Nature and causes of the disease. It is evidently a morbid 

 condition of the bony structure. On dissecting the skin off 

 the tumour, we find it covered with tough fibrous tissue 

 arranged in layers. The fibrous element diminishes towards 

 the deeper parts of the growth, where at various parts yellow 

 accumulations of a friable, cellular, or granular matter are 



