PARROT MOUTH. 359 



pass down in front of those of the lower jaw, and these 

 latter, when long enough, reach to and press upon the bars 

 or roof of the mouth, in consequence of which considerable 

 irritation may be caused. A horse with t'liis deformity does 

 very badly at pasture, being unable to gather a sufficient 

 quantity of food to maintain himself in good condition, 

 and nearly always loses flesh when placed on pasture. The 

 deformity, however, does not appear to cause the animal 

 much inconvenience when feeding from the manger, except 

 when fed on unshelled Indian corn, in which case he 

 experiences considerable difficulty in getting the grain off 

 the cob. The treatment consists in keeping the teeth 

 shortened by means of the rasp, both the upper and lower 

 incisors, but particularly the- latter, being shortened occa- 

 sionally, to prevent contact with, and injury to the soft 

 tissues. 



Odontones, or Tooth Tumours. — These enlargements 

 occur in connection with the teeth, and are composed prin- 

 cipally of crusta petrosa or dentine. They sometimes attain 

 a very large size, and while rendering the process of mas- 

 tication very difficult, at the same time give rise to a con- 

 siderable amount of irritation. 



Treatment. — All that is necessary is the removal of the 

 enlargement, using the tooth shears or rasp for the pur- 

 pose. 



Dentigerous Cysts or Tooth Substances. —Tooth substances 

 may be formed in almost any organ of the animal body, and 

 have been found in the testicles, on the superior maxilla, 

 and frequently within the sinuses, and have also been found 

 in the muscles near the ear, etc. The substance may have 

 the form and appearance of an incisor, or it may be large 

 and bear a very close resemblance to a molar tooth. Its 

 presence is rarely discovered during life, or if discovered, 

 on account of its situation, treatment is rarely adopted. 



