CALLOSITIES OF EQUINE ANIMALS AND OTHERS 233 



mode of life more than any other we have had the fullest oppor- 

 tunity of becoming intimately acquainted with, how can we be 

 expected to account off-hand for the endless strange variations of 

 form and structure of animals of whose habits and methods of 

 existence we know absolutely nothing ? ' 



I had pondered over the callosities of the Horse, Ass, and 



FIG. 84. (a) Callosity on fore-leg of Tibetan wild Ass or 'Kiang' (Equus hemionus); 

 (b) callosity on inner aspect of hind-leg of the ' Alpaca ' (Lama pacos] ; (c) tuft of dark hair on 

 light ground of leg of the ' Vicugna' (Lama -vicugna] all three from Natural History Museum. 



Zebra a good bit before I read the foregoing in Sir W. Flower's 

 book on The Horse. 



Fig. 84 (a) shows the callosity on the fore-leg of the Tibetan 

 wild Ass ; and Fig. 53 shows it on the fore-leg of the Zebra. 



I have never met with an Ass which had callosities on its hind- 

 legs. In the stables of the Great Northern Railway Company I 

 have seen a Horse which had no callosities on the hind-legs ; and 



