DISEASES OF THE EAR. 19 1 



" The second variety of polypus growth, the chondroma- 

 tous, is that which is produced from the lining membrane of 

 the inner half of the tube, the dermo-periosteum, and in its 

 structure it differs somewhat from the former ; it is more 

 dense, and almost cartilaginous, and usually having a broad 

 and more sessile base, occupies a greater extent of the parietes 

 of the tube. Its surface is comparatively smooth, pale, and 

 almost insensible to the touch ; but according to the extent 

 of the ulcerative process behind and within it, so will the 

 nature and properties of the discharge be with which it is 

 accompanied. 



" Both these species of polypus of the meatus, the hsema- 

 toid and chondromatous, are most commonly connected with, 

 and accompanied by, ulceration of the softer tissues, or caries 

 of the auditory process. These excrescences are usually situ- 

 ated externally to the seat of ulceration, being produced frohi 

 the vascular margin of the ulcer ; and so long as they are 

 permitted to remain, the latter morbid condition, the canker 

 of the ear, wilt be kept up for an indefinite period ; hence, 

 should the animal be of any value, it becomes a matter of 

 considerable importance to arrive at an accurate diagnosis of 

 the actual condition of the diseased parts. The symptoms, 

 therefore, which attend the existence of polypoid growths of 

 the external meatus are very similar to those that indicate 

 the chronic form of internal canker of the ear. These are 

 also preceded by those of general pyrexia, which usher in the 

 local disease, such as general languor and lassitude, loss of 

 appetite, considerable thirst, turning out of the coat, and ball- 

 ing of the feeces. As these constitutional and general symp- 

 toms diminish in severity, then those characteristic of the 

 local disease become gradually and more manifestly evinced. 

 The animal has a dull, heavy, and rather watery eye ; bemoans 

 or whines at intervals ; and if his master be present h6 feels 

 a pleasure, a confidence, and a relief in pressing and rubbilig- 

 his aching ear against any part of his master's body. Under 

 other circumstances he presses and harrows it against the 



