PATHOLOGICAL CONDITIO A^S OF FEET. 



813 



affected with corns. The hoofs were reduced so as to be in- 

 capable of performing their office; and while the drawing-knife 

 was doing its scooping work, natui-e's fence of bone was closing 

 the breach. Leather soles and bar-shoes hid the bottom of the 

 mangled feet. 



Fig. 717. — The pathological conditions represented by this 

 engraving, which includes the bones of the foot corresponding to the 

 last referred to, excepting the navicular bone, offer much in com- 

 mon with the last for contemplative instruction. All that has been 

 said about the urgent causes which induced such extensive substi- 

 tutions of bone for ligaments and cartilages, the augmentations and 

 complete anchylosis of joints, applies to this case. The history of 



Fig. 718. 



both subjects is alike unknown; the specimens were obtained at the 

 place of slaughter, to which the lame horses were taken at Edin- 

 burgh, and the dissections and observations were carefully carried 

 on by me, and much time was devoted to the work. The cause 

 and origin of the disease in this instance differed from those of the 

 former, and so, in the sequence and termination, obvious differences 

 in external appearances and conditions were observable. 



The original and essential scat of disease in the case represented 

 by Fig. 717 was caries of the pyramidal process of the coffin-bone, 

 Avhich the drawing admirably shows; the foot represented is the 

 near one, and an enlargement and deep excavation of the bone is 

 seen in the lateral aspect of that projection. The disease had been 

 of very long standing, as all the changes the foot had undergone 



