356 DISEASES OE CATTLE. 



drops off, leaving a raw healing surface. When the ear is only 

 slightly affected by the cold, an excoriation or peeling off of super- 

 ficial skin takes place, accompanied by some pain and itching. 



Treatment. — A good liniment for frozen ears will be found in a 

 mixture of turpentine, ammonia, and chloroform, of each 1 part, 

 added to 6 parts of sweet oil. Rub this on the ear several times a 

 day. It will relieve pain and stimulate the circulation, thus favoring 

 a recovery of the injured structures. 



LACERATIONS OP THE EAR. 



Aggressive dogs are the most frequent cause of lacerated ear, gen- 

 erally leaving a torn, ragged edge and bruised cartilage. 



Treatment. — If the wound is extensive a trimming of the ragged 

 edges becomes necessary ; then fasten the edges together with silver 

 wire, catgut, or strong, thick, linen thread, taking a deep hold. Apply 

 pine tar. 



DISEASE OP THE CARTILAGE AND NECROSIS. 



Occasionally the cartilages of the ear become affected, usually the 

 result of a deep bruise; pus forms, which burrows under the skin, and 

 may find a discharge from any part of the ear more or less distant from 

 the seat of the disease. When the cartilage has been extensively 

 injured, pieces of it may become dead (necrosed) and dissolve, to be 

 carried away with the pus, or it may lead to extensive sloughing and 

 the formation of numerous running sores. In the disease of the car- 

 tilage there is seldom much swelling or great pain. The discharge is 

 usually very offensive, and occasionally streaked with blood. When- 

 ever there is a long-continued, persistent discharge from one or more 

 openings in the ear, disease of the cartilage may be suspected. 



Treatment. — The sinus formed by the passage of matter should be 

 probed and searched to the bottom for the presence of a foreign sub- 

 stance or the evidence of decaying cartilage. When the probe touches 

 necrosed cartilage it will feel like the presence of a piece of dry leather 

 or partially softened wood. A counter opening must then be made 

 at this place, and all diseased cartilage cut away with the knife. The 

 subsequent treatment consists in keeping the artificial wound open 

 for the discharge of pus, and the injection of chloride of zinc, 5 grains 

 to the ounce of water, once or twice a day, until the wound is healed. 



ENCHONDROMA OP THE EAR. 



This is an excessive growth of cartilage, found at the base of the 

 ear in the form of a hard, painless tumor, firmly attached to the mov- 

 able ear. The only recourse for its removal is the knife in the hands 

 of one acquainted with the anatomy of the part involved in the 

 operation. 



