PLATE X. 



RINGBONE — NAVICUL ARTHRITIS — OSSIFIED CARTILAGES. 



(From dried bones in Mr. Field's Museum.) 



Fig. 1 represents a ringbone {a, b, c, d) more prominent on one side (a, h) than the 

 other ; but most conspicuous (in the dried bone) in front. The bony tumour 

 extends completely round the fore and lateral parts of the pastern and coronet 

 bones, uniting them together in ossific (and therefore immoveable) union, and 

 thus completely anchylosing the joint naturally existing between them. 



Fig. 2 is an admirable representation of ossification of the cartilages of the foot, 

 with the navicular bone in situ, having its superior surface in a normal condition ; 

 notwithstanding its inferior surface (exhibited in Fig. 3) shews a deep caries in 

 its middle, the eifect of navicularthritis. In fact, this figure displays in the 

 dried bone the disease represented in Plate VII in the recent foot. 



