Disease of the Lachrymal Gland and Ducts. 353 



cinoma of the orbit in horses and dogs, and Leblanc in cattle. 

 Melano-sarcoma is not uncommon in the orbits of gray horses 

 which are changing to white. 



Exostoses are common around the orbits of cattle. 



If such growths do not show on the surface they cause a more 

 or less unsightly protrusion of the eyeball, owing to the presence 

 of the neoplasm in the depth of the orbit, and the removal of 

 the bulb becomes a necessity. 



DISEASE OF THE LACHRYMAI. GI.AND AND DUCTS. 

 DACRYO- ADENITIS. 



Even in man these parts are remarkably free from disease, 

 while in the lower animals, we have literally no record of such 

 conditions. Inflammation of the gland (dacryo-adenitis) would 

 be manifested by a sensitive swelling under the outer part of 

 the orbital process, and upper eyelid and by lachrymation, and 

 obstruction of the gland duct and by a tense transparent rounded 

 swelling inside the lid. A fistula is possible from a penetrating 

 wound of the lid in the same situation. In both of the latter 

 conditions an opening made through the palpebral conjunctiva 

 will allow the discharge of the tears in the proper place, and 

 healing of any external wound may be hastened by suture or 

 plaster. 



OBSTRUCTION OF THE LACHRYMAI, PUNCTA. 

 ATRESIA. INFLAMMATION. 



Congenital atresia of these puncta has been recorded in foals, by 

 Hollmann, and obstruction as the result of inflammation, by La- 

 fosse, Verjaus and Tyvaert, and of the entrance of the seeds of 

 bronius by Stockfleth. 



Apart from congenital atresia and impaction of foreign bodies 

 the symptoms are those of conjuctivitis, with escape of tears 

 over the face (epiphora). Injection of aseptic water into the 

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