THE ORGANS OF SPECIAL SENSE. 217 



lost after this' operation from the amount of destructive 

 inflammation set up. A seton may be inserted in the 

 cheeks, but no cure can be effected without a radical 

 change of diet and careful regulation of the digestive 

 organs. The bulging of the cornea must not be mistaken 

 for staphyloma. 



Traumatic Distension of the Eyeball results from 

 effusion and suppuration in cases of bruise or punctured 

 wound. Blaine obtained excellent results in such a case 

 by evacuation with a couching needle. 



The conjunctiva of the dog is occasionally the seat of der- 

 moid tumours. The conjunctiva and skin are developed 

 from the same source, and sometimes a circumscribed 

 portion of the former becomes thick and bears hairs. This 

 is generally congenital and detected soon after the young 

 animal's eyes are opened, the attention of the owner 

 being attracted to those organs by profuse lachrymation. 

 The irregular part looks like a white wart, and the hairs 

 may be seen. It varies in its degree of resemblance to 

 true conjunctiva, and also in the amount of inconvenience 

 it causes. It should be removed with scissors or a knife 

 and the spot touched with caustic. Opacity may remain. 

 Messrs. Taylor and Parker have recorded cases of this 

 nature in the 'Veterinary Journal ' for 1877 ; one patient 

 was a fox terrier, the other a setter. Cataract is frequent 

 in the dog, especially as a result of senile changes. Thus 

 it is almost always lenticular, and could be remedied by 

 couching or extraction, but such an operation is manifestly 

 open to objections in the case of dogs ; the vision would 

 not be rendered perfect by it without artificial aids, and 

 an animal which is blind can still be petted and taken 

 care of by a fond owner. This lesion may result from 

 accident and then be capsular or capsulo-lenticular, but 

 such a condition is rare. Youatt records a curious case of 

 accidental extraction of an opaque lens by a scratch from 

 a cat. Amaurosis is more often seen in the dog than the 

 horse. It may generally be traced to blows or other 

 injuries, such as fractures of the skull or to direct over- 

 tension on the optic nerve in cases of dislocation of tha 



