130 PRINCIPLES OF VETEKINAEY SUEGEEY 



first as swellings from nut to fist size, become soft and exhibit 

 a cheesy material containing the tubercle bacillus. In the 

 dog, ulcers on the neck involving the regional lymph gland 

 have been observed. 



Skin tuberculosis has been frequently observed as a 

 primary lesion abont the head, and here especially about the 

 eye and commissure of the beak of the parrot. They are 

 either soft tumors from pinhead to egg size, of globular shape, 

 or skinhorn-like excrescences in the skin ; tubercular 'ulcers 

 containing the bacillus are also observed. 



Describe tuberculosis of the mucous membranes. 



In the shape of ulcers or mushroom-like mass, it is 

 observed in the larynx and trachea of cattle. Upon the nasal 

 mucous membrane of cattle one sees occasionally an aggrega- 

 tion of small, lardaceous looking nodules, which may become 

 confluent and'form an ulcer, there being also nasal dyspnoea 

 and discharge. Uterine tuberculosis (endometritis caseosa 

 tuberculosa) is not rare. In the parrot, tubercles and ulcers 

 are seen upon the mucous membrane of the mouth and eye. 



Describe tuberculosis of the bones and joints. 



Tuberculosis of the bones is usually secondary, that is, it 

 is caused by a tubercular embolism ; therefore, starting in the 

 marrow, an osteomyelitis granulosa is the result. 



The bones more frequently involved are the temporal 

 bone, sternum, cervical, dorsal and lumbar vertebrae, and ribs. 

 In tuberculosis of the middle ear (otitis media and interua 

 tuberulosa) in swine, the infection takes its origin in the 

 pharyngeal cavity and reaches the cavity of the middle ear via 

 the Eustachian tube, creating here a tuberculos osteomyelitis, 

 next periostitis and rarefying osteitis, necrosis of the boue 

 now reaching the meninges, and finally brain. In goats, 



