SUPPURATING OSTITIS. 



29 



partially or entirely surround the insertions of the lateral ligaments, 

 mter-phalangeal articulations or insertions of the digital extensors, they 

 are painful, and produce lameness of varying intensity. 



Diagnosis is easy, partly because the tension of the skin and the 

 fibrous thickening render palpation painful. 



Prognosis is grave, because the effect of ring-bone is sometimes to 

 render working animals useless. 



Treatment. To relieve the diseased claw of pressure due to its bearing 

 on the ground, the shoe should be removed and the claw freely pared. 



Fig. 14. — Sarcoma of the periosteum 

 beneath the scapula. 



Fig. 15. — Sarcoma of the periosteum 

 covering the upper end of the tibia. 



If necessary, the healthy claw of the same foot may be raised l)y placing 

 a piece of thick leather between the sole and the shoe. It is advisable at 

 once to apply an energetic plaster, or, better still, to resort to firing in 

 points. 



SUPPURATING OSTITIS. 



In addition to the changes in bone resulting from rachitis, osseous 

 cachexia, tuberculosis, and actinomycosis, one sometimes sees cases of 

 periostitis or ostitis pure and simple. As a result of external injury or 



