270 



DISEASES OF THE HORSE'S FOOT 



any rate of the outer layer of the periosteum, is in laminitis 

 constant even, we repeat, in a mild case. 



When the case is a serious one we have ample evidence 



Fig. 118. — Showing Changes in the Os Pedis with Laminitis of 

 Standing, (a, Viewed from the front; b, viewed 

 from the side.) 

 The porous condition of the bone, which is here shown, is a 

 result of rarefying or rarefactive ostitis. This specimen 

 also illustrated (what the photograph cannot show) an 

 accompanying condition of condensation of bone, or osteo- 

 plastic ostitis. (For a fuller description of the changes 

 occurring in these forms of ostitis; see Chapter XL) 



to show that ostitis exists, and exists in a severe form. 

 The bones become vastly altered in shape, a process of 

 absorption leads to the formation of large, irregular cavities 

 within their substance, and what of the bone is left is 



