14 



THE EXISTING EQUIDAE 



[CH. 



absence in pure-bred Arab horses and in thoroughbreds." " The 

 nearer a horse approaches the heavy draught type, the thicker 

 is the growth of the callosities on his legs 1 ." 



We shall presently find (p. 19) that in the typical 'Celtic' 

 pony the hock callosities are wanting, as is not unfrequently the 

 case in North African horses, the front chestnuts are small, whilst 



Jfefettk 



, 



FIG. 2. Chestnut on right 

 fore-leg of a Prejvalsky horse 

 (natural size). 



FIG. 3. Hock Chestnut 

 (right) of a Prejvalsky 

 horse (natural size}. 



FIG. 4. Hock Chestnut 

 (right) of Iceland pony 

 of cart-horse type (na- 

 tural size). 



the ergots have entirely vanished, as in the pure-bred Arabs and 

 thoroughbreds noticed by Capt. Hayes. 



Through the kindness of Prof. Ewart, I am enabled to figure 

 (full-size), from drawings made from his own animals, examples 

 of chestnuts and ergots in various Equidae (Figs. 1 10). 



1 Hayes, Points of the Horse (ed. 3), p. 319. 



