390 Veterinary Medicine. 



recognition of pigmentation of the growth and the adherent iris 

 often revealed by obUque illumination will nearly always show 

 the true nature of the case. 



Treatment is by iridectomy and eserine if the disease can be 

 recognized in its earliest stages, but it is rarely satisfactory. 

 I^ater the choice may be between excision of the staphyloma and 

 coaptation of the edges of the wound by suture, and the enuclea- 

 tion and removal of the eyeball. The last resort is preferable to 

 the continued irritation of the staphyloma by the lids and cilia 

 under the ocular movements. 



ECTASIA CORNEA. KERATOCONUS. CONICAI, 



CORNEA. 



This consists in a thinning and protrusion of the cornea in the 

 form of a blunt cone, without loss of transparency. It has ac- 

 cordingly been called staphyloma pelludda. There is a gradual 

 attenuation and distension of the corneal tissue from some un- 

 known cause. It has been seen mainly in the young and is 

 manifestly due to a trophic defect. Stockiieth records a case in 

 a foal and Bayer in a cow. No satisfactory treatment has been 

 proposed, but as the trouble usually comes to a standstill without 

 perforation, it can be left to take its course. With rapid in- 

 crease and manifest tension antiseptic puncture of the cornea or 

 even iridectomy might be tried. 



KERATOGIvOBUS. 



This is a variety of ectasia in which the clear, pellucid, pro- 

 truding cornea is more globular and less conical in outline. It 

 is seen especially with enlargement of the entire eyeball {buph- 

 thahnus') . 



TUMORS OF THE CORNEA. 



Various tumors may grow from the cornea. Dermoid cysts 

 may implicate the cornea and demand excision. Malignant 

 growths demand extirpation of the eyeball. 



