THE EYE. 371 



regain their normal condition. We are not aware that 

 inversion and eversion of the eyelids have ever been seen 

 in the ox. We have found records of a few cases of 

 Ptosis, dropping of the upper eyelid, but have no evi- 

 dence as to the occurrence of disease in the lachrymal 

 apparatus. 



TUMOUES OF THE CaRUNCULA LACHRYMALIS AND CaRTILAGO- 



NiCTiTANS sometimes attain a considerable size. They 

 result from chronic irritation or conjunctivitis, and must 

 be removed by means of the scissors, the animal having 

 been cast and the cartilage fixed. The latter must be as 

 little injured as possible in the operation. Sometimes 

 caustic applications will suffice to destroy these tumours, 

 but generally it is found necessary to operate. 



Suh-secHon 2. — Diseases of the Eyeball. 



The eyeball is somewhat flatter in the ox than in the 

 horse, the cornea more convex, and the tapetum lucidum 

 has a golden-green colour, bluish near the margin, and a 

 fibrous structure. 



Conjunctivitis — Simjple Ophthalmia — results from in- 

 juries, and especially from the entry of foreign matters 

 into the eye. It is denoted by profuse lachrymation, the 

 tears trickling down the cheek, thickening of the eyelids, 

 intolerance of light, redness of the conjunctiva, and 

 generally some opacity of the cornea through extension 

 of irritation, due to general causes, as exposure to cold, or 

 to acrid vapours ; both eyes may be thus affected (but this 

 seems to be very rare). An examination must be made for 

 the detection of foreign bodies, the lids being separated by 

 the finger and thumb, and each everted in turn. The 

 rapid movement of the haw over the eye renders this ex- 

 amination a little more complicated than it otherwise would 

 be. The cause having been removed the irritation may be 

 overcome by fomentations and dressings with solution of the 

 subacetate of lead, and the eye or eyes should be protected 

 from the light. This disease is generally complicated with 

 keratitis or corneitis, in which the cdlls which are collected 



