THE HIPPOTIGRINE GROUP. 323 



on the inner surface of the upper arm : they have 

 sonorous but varied voices ; their dentition is Equine, 

 but in one species it is said that there is some ano- 

 maly in the mammae of the female. They see re- 

 markably well both by day and by night, surpass 

 the Equidae of the northern hemisphere in natural 

 courage, are their equals in speed, and the species 

 that are least adorned with stripes appear above the 

 rest, and, next to true horses, formed for the use of 

 man. They can be all tamed and ridden; their 

 vicious disposition, though an impediment, being 

 placable under judicious treatment; and there is 

 little doubt that, in a few generations of domestica- 

 tion, most, if not all, might be rendered serviceable, 

 particularly in South Africa, where they find their 

 coarse but natural food, and are exempt from the 

 distempers which are there often so fatal to our 

 present breeds. 



They are gregarious, but do not keep together in 

 such numbers as the horses and asses of the northern 

 hemisphere ; nor does it appear that they are under 

 the guidance of a stallion leader, who exercises au- 

 thority, and exposes himself in defence of the herd. 

 Some prefer mountain localities, others the upland 

 plains, and each species seems to affect the more 

 exclusive society of some particular ruminants. The 

 species amount at least to three, with others not 

 as yet sufficiently examined to be permanently ad- 

 mitted, but whether distinct or mere varieties the 

 location of all in juxta-position, with at best the 

 separation of a river or of a different mountain or 



