THE EYE. 373 



silver. Special attention must be directed to improve- 

 ment of the condition of the animal. Repair may be 

 established, even after the aqueous humour has escaped. 



Go7ifjenital hairy tumours have been seen on the sclerotic. 

 The most recent case on record is that in the ' Veterinary 

 Journal/ vol. iv, p. 169. Development shows us that 

 the conjunctiva is but a modified portion of the external 

 investment of the body ; this is a teratological proof of 

 the same fact. 



Worm in the Eye is sometimes seen in the ox (see ' Veteri- 

 narian/ vol. i, p. 77). The parasite is a Nematode (either 

 Filaria lachrymalis, F. papillosaf or 8trongylus armatus), 

 and occupies the anterior chamber, where it excites irri- 

 tation, and thus produces corneitis and some degree of 

 conjunctivitis. We have no instance of this occurring in 

 this country, but perhaps it might be seen more often in 

 India. Incision at the supero- external part of the cornea, 

 with pressure on the eyeball, causing the aqueous humour 

 to squirt out, carrying the worm with it, should be tried, 

 as in similar cases in the horse. 



Lymjphy deposits in the Aqueous Ghamhers result from 

 inflammation of the eye, especially the rheumatic form, 

 and they may cause adhesion of the iris to the lens 

 capsule. They are generally only temporary, and soon 

 disappear. When small and attached to the anterior part 

 of the lens capsule they may be mistaken for cataract, 

 unless care be exercised. In the ' Veterinarian,^ vol. xxv, 

 p. 3, Mr. Cartwright relates a case of lymphy deposit, 

 which he attributed to inflammation of the iris. No 

 treatment is required — simply time for absorption. 



Specific or Peeiodic Ophthalmia, also described as 

 Retinitis, is not so frequent in the ox as in the horse.^ 

 It is probably rheumatic, since it is periodical, and under- 

 goes metastatic passage from one eye to the other. It 

 especially effects the deeper structures, causing disorgani- 

 sation of the retina, a breaking up of the hyaloid mem- 

 brane, opacity of the lens, an orange colour of the iris, and 



1 Many cattle pathologists deny that this disorder occurs in the ox. The 

 balance of opinion seems to favour the view advanced in the text. 



