Coloboma Iridis. Congenital Aperture in Iris. 401 



clouded. If the offending body is a piece of iron or steel and 

 can be reached by a magnet introduced through the original 

 wound or through one made with a lancet in the edge of the 

 cornea it may be extracted by this means. If it is shot or other 

 body that is not attracted by a magnet the portion of the iris in 

 which it is entangled may be drawn out with forceps and snipped 

 off with fine scissors. Due antiseptic precaution must be exer- 

 cised. 



COLOBOMA IRIDIS. CONGENITAL APERTURE IN IRIS. 



This is a congenital defect in which there is an aperture in the 

 iris. Hering figures the two eyes of a horse in which these ap- 

 peared in the direction of the outer canthus. Renner records a 

 case in • a foal in connection with intra-bulbar enchondroma. 

 Dochtermann and Berlin record that among 64 pigs the result of 

 breeding a boar on his daughters and grand-daughters no less 

 than 36 showed coloboma. Moller figures a dog with the same 

 affection. 



The condition is not known to prove hurtful to the affected 

 animal so that it may be wisely let alone. 



DOUBLE PUPIL. 



Mayer notes a case of congenital double pupil in the horse, a 

 bridge extending across the space from the upper to the lower 

 border and cutting off the outer third of the opening. The 

 present writer has seen a similar condition as the result of union 

 of the cqrpus nigrum in severe iritis. Section of the bridge is 

 possible, though rarely desirable, seeing that it opens a door to 

 possible infection. 



ALBINISM. WATCH-EYE. 



The albino is an animal in which there is a complete absence 

 of pigment in the eye. It is usually seen in white races of rats, 

 26 



