78 OPHTHALMOLOGY FOR VETERINARIANS 



flock, and also from members of the household, especially 

 children. 



There is a stage of exfoliation in which much of the 

 membrane can be easily removed; but if this cannot be 

 done without causing bleeding of the tissues beneath 

 it should not be attempted. Numerous remedies have 

 been recommended. Corrosive sublimate solution in 

 I : 2000 or even i : looo parts has been used without 

 injury to the cornea. Carbolic acid in suitable strength 

 or a saturated boric acid solution is of value. Some 

 use kerosene oil with good results. Antitoxin has 

 been used satisfactorily. Give the chicken soft foods 

 or milk, as grain causes irritation of the mucous tracts 

 if the membrane has extended to the mouth and throat. 

 With an ordinary chicken the best course to pursue is 

 to cut its head off and bury it, but with a prize chicken 

 of great value it is a different proposition. 



Pinguecula. — ^This is a slight elevation of the con- 

 junctiva or subconjunctival tissue, just a few milli- 

 meters from the internal border of the cornea. It was 

 formerly supposed to be a fatty growth, hence its name. 

 It is reddish-yellow in color, and at times becomes 

 inflamed, when it causes much discomfort. Just what 

 its cause is no one seems to know. Errors of refrac- 

 tion, dust, and strong wind are supposed to be the 

 cause. 



When in a quiescent state they are not troublesome, 

 but when inflamed they are very annoying. Astringent 



