38 



and pleura, in acute muscular rheumatism, in inflammation o£ 

 the navel in young animals and occasionally in connection 

 with catarrhal inflammation of the conjunctiva or ulceration 

 of the cornea. Penetrating wounds or injuries near the 

 margin of the cornea excite inflammation in the iris. Very 

 rarely does iritis appear alone — without other parts being 

 involved at the same time. 



Owing to the fact that the iris is richly supplied with 

 blood vessels, it is disposed to produce exudates, or to bleed- 

 ing from its surfaces. The exudate may be flaky and gray, 

 floating in the aqueous humor; or it may be pus-like and 

 form a yellowish sediment at the bottom of the aqueous 

 chamber. 



These exudates may be tinged with blood or the entire 

 aqueous humor may be colored by blood from the vessels of 

 the iris. The exudates from the posterior surface of the iris 

 falls between the iris and anterior or front surface of the 

 lens ; this pushes the iris forward ; unless the iris is moved 

 by the expansion of the pupil, the back or posterior surface 

 of the iris becomes firmly attached to the capsule of the 

 lens. The iris may, also, become attached to the posterior 

 surface of the cornea; this frequently results from perforat- 

 ing wounds or ulcers of the cornea. The discoloration, 

 swollen condition of the iris, and the flaky, purulent or bloody 

 exudates can not be observed in many cases, because the 

 cornea is so clouded or opaque. However, in the first or 

 the last stage of such cases, one may be able to view the iris. 

 During the "clearing up" period in moon-blindness one may 

 observe the iris, faded somewhat in color, with its pupillary 

 margin more or less ragged and irregular. Generally the 

 tears flow in excess, dread of light and extreme sensitiveness 

 are present during the active stage of iritis. 



In the treatment of iritis the chief aim is to prevent the 

 pupillary or free margin of the iris from forming attach- 

 ments to the capsule of the lens or the posterior surface of 



