DISEASES OF THE HOG, : 157 
CHAPTER XVI. 
DISEASES OF THE EYEBALL. 
The eye of the pig does not seem to be subject to 
many diseases, but I have no doubt but that cases 
occur which are not noticed; I shall therefore only 
mention those I have met with. 
Conjunctivitis: Simple ophthalmia results 
from injuries, and especially from foreign matters 
entering the eye. Exposure to cold, heat and acrid 
vapors, it is also the result of other diseases. When 
injuries and foreign matters are the cause one eye 
ouly is usually affected. 
Symptoms: There will be a profusion of tears 
trickling down the cheek or cheeks, there will be a 
thickening more or less of the eyelids and a red- 
ness of their lining membrane; this also may be 
thickened, which nearly closes the eye. An exam- 
ination of the eye must be made, the lids being 
separated by the finger and thumb and each lid in- 
verted in turn. If the eye has been injured, for a 
day or two there will usually be a white scum over 
the corner, which usually disappears when the in- 
flammation is reduced. 
Treatment: If there is any foreign substance in 
the eye have it removed. This is not easily done as 
