DISEASES OF THE IRIS AND CILIARY BODY 1 19 



endangered by extension of the septic elements to the 

 meninges. 



Cysts and Tumors of the Iris.— Cysts of the iris are 

 rare, though they sometimes appear in the stroma of the 

 iris as the result of injury. They are usually very 

 gradual in their development. Meyer (in Law's "Veter- 

 inary Medicine") speaks of these lesions in horses, 

 " but they are very difhcult to diagnose even with the aid 



Yig, 25.— Photograph of carcinoma ot the orbit of a dog. (Veter- 

 inary Record, vol. xvii, p. 694, " Proceedings of the Central Veter- 

 inary Medical Society.") 



of the ophthahnoscope. The very manifest bulging at 

 the part may be due to excess of pigment, especially in 

 the corpora nigra, and an exploratory puncture would 

 only be warranted when the protrusion becomes excessive 

 and injurious. One such puncture by Eversbusch led 

 to infection and loss of the eye." In this instance prob- 

 ably the puncture was not made under the strictest 

 aseptic precautions. The treatment of cyst of the iris 



