34^ 



DISEASES OE THE .FEET. 



in another, to the formation of large carious-looking cavities J 

 exposing ;^the^vaacular interior- of ..the»boilel (see No. 3, Eigj,62}^ 



rior62 represents external"'app>€arance of infendiTarticulaHugTurfacSfw 

 of four navicular bones. 



1. Apparently healthy bone ; externally it presents no appearance of 

 disease. It is carefully selected as typical of an apparently sound bone, its 

 cartilage of incrustation being intact, and the tendon perfectly healthy. 

 The animal from which it was taken had been lame from navicular diseaoe 

 before its death. Its internal appearance is represented by No. 3 in tho 

 preceding illustration. _ _ 



2. Calcification of the articular cartilage. The calcareous spots indi-j 

 cated by the dark dots ; interior of this bone much opened up. ' 



8. Caries of articular surface. 



4. Adhesion of tendon to the exposed cancelU of the bone. 



with gradual removal of the bone, its texture at same time 

 becoming friable, until at last it may become fractured by some 



