Fig. 16. 



Fig. 17. 



Fig. 16.— The Modified Nail or Hoof. 



In the upper row are seen the side 

 and sole views of the fore foot of a 

 horse compared with the fore foot of a 

 zebra. In the lower row the side and 

 sole of the hind foot of the horse com- 

 pared with the sole of the zebra. In the 

 zebra foot the frog is seen to be ex- 

 panded and to extend farther backward, 

 while in the horse foot it is more en- 

 closed by the hoof. 



Fig. 18. 



Fig. 17.— Section of the 

 Fore Foot of a Horse. 



This exposes the terminal 

 bones or phalanges of the 

 finger as buried in the fet- 

 lock joint and hoof, resting' 

 on an elastic pad. 



Fig. 18.— The Ergots— C and Chestnuts— F. 



Presenting the foot of a deerhound and feet of a zebra to show 

 the relative position of the ergots and of the chestnuts in these two 

 animals. The ergot is at the back of the fetlock joint ; the chestnut 

 haf moved upward, above its original position, to the inside of the 

 wrist or knee joint of the horse. 



