228 THEORY AXD TRACTICE 



inflammation following castration and the botryomyces is sup- 

 posed to play a role. Some part of the fibrous mass will usually 

 dve evidence of an abscess in the wall of which the fungus can 

 be found. Several different kinds of these botryomyces have 

 been described and probably no particular kind is specific. The 

 fungus seems to be a very large sized coccus, which is found in 

 masses mucli like the zoogloea. 



Muscle tumors or myormta, are not very common. If a 

 proliferation of the non-striated muscle they are called leiomy- 

 oma; if of the striated, rhahdomyoma. Leiomyoma is the most 

 common. In the horse leiomyoma of the kidney has been re- 

 ported and in the sheep, of the liver. In the human a common 

 tumor is the uterine 'fibroid, which is a mixture of non-striated 

 muscle and fibrous connective tissue. Leiomyoma of the ovary 

 is rare. 



DISEASES OF THE BONES. 



All of the lower animals are subject to diseases of the bones. 

 The horse especially is more prone to bone disease because of 

 high feeding and rapidity of gait. In health bone is insensible, 

 but in disease it is very sensitive. 



Inflammation of the bone substance is called osteitis ; of the 

 periosteum, periostitis; of the marrow, osteomyelitis. The 

 three forms of inflammation are dififlcult to separate. They are 

 usually the result of external injury. 



Inflammation of the bone has the same phenomena as in- 

 flammation occurring in soft tissue. It is attended by very 

 many of the same changes, but on account of the dense substance 

 making up the bone tissue somewhat different results come about. 

 Serum, fibrin and pus may be found but they will be less in 

 amount. The hard substance of the bone will be absorbed to 

 greater or less extent and become replaced by animal matter, and 

 there results a deficiency in the earthy or mineral matter. The 

 newly formed tissue is the so-called granulation tissue of bone, 

 which after a time becomes ossified. This tissue may be very 

 vascular before ossification takes place. Although the bone is 

 much enlarged as the result of the inflammation, yet it is much 



