DISEASES OF HORSES AND CATTLE. 291 



ease, arising from some cause not well defined at 

 present. Low, undrained lands seem to be at least 

 one of the causes, as it disappears by degrees after 

 the land has been drained and cultivated. It 

 seems to have a tendency to run in some breeds of 

 horses. 



Symptoms: The attacks usually come on sud- 

 denly ; a horse may be all right in the evening and 

 by morning be badly affected either in one eye or 

 in both. The eye shows signs of weakness, the up- 

 per lid droops and the eye seems smaller, it stands 

 light badly, and when the animal is brought into 

 the light the eye seems to retract and the haw is 

 drawn over |t and the lids closed as much as pos- 

 sible; there is an abundance of tears, which gives 

 the eyes a very watery appearance. When the eye 

 is examined closely it looks dull and muddy and it 

 is impossible to see the deep structures. In some 

 cases the eyeball has an amber color. The disease 

 may move from one eye to the other, and usually 

 disappears in a week or ten days, to return in a 

 few weeks again. Its return is very regular in 

 some horses, and in others it may not return for six 

 months. The first attack seldom causes blindness, 

 but each attack deranges the structure of the eye 

 1 p a certain extent and by degrees the deep struc- 

 tures are destroyed, and the ball has a bluish 

 white appearance. 



Treatment: There is no cure for this disease, but 

 by attending to it when it appears I think in a 

 great many cases it can be helped ; that is, we can 

 subdue the inflammation and prevent destruction 



