ELQUID.E 387 
black stripes of the flanks and haunches fainter stripes are generally 
seen. 
£. grevyii—Under this name a Zebra has been described which 
was sent in 1882 to Paris from the Galla country, lying to the 
south of Abyssinia, the most northern locality in which Zebras have 
previously been met with. In many of its characters it resembles 
E. zebra, but the stripes are much finer and more numerous than in 
the typical examples of that species, and it has a strong, black, and 
isolated dorsal stripe. Even allowing for the great variations that 
are met with in the markings of animals of this group, the aberrant 
characters of this individual are quite sufficient to separate it specific- 
ally from the true Zebra of South Africa. Other similar specimens 
have been recently brought from the Somali country. 
The flesh of the Zebras is relished by the natives as food, and their 
hides are very valuable for leather. Although the many attempts 
that have been made to break in and train these animals for riding 
or driving have sometimes been rewarded with partial success, they 
have never been domesticated in the true sense of the word. 
There are thus at least seven modifications of the Horse type at 
present existing, sufficiently distinct to be reckoned as species by 
all zoologists, and easily recognised by their external characters. 
They are, however, all so closely allied that each will, at least in a 
state of domestication or captivity, breed with perfect freedom with 
any of the others. Cases of cross breeds are recorded between the 
Horse and the Quagga, the Horse and Burchell’s Zebra, the Horse 
and the Hemionus or Asiatic wild Ass, the common Ass and the 
Zebra, the common Ass and Burchell’s Zebra, the common Ass and 
the Hemionus, the Hemionus and the Zebra, and the Hemionus and 
Burchell’s Zebra. The two species which are perhaps the farthest 
removed in general structure, the Horse and the Ass, produce, as is 
well known, hybrids or Mules, which in some qualities useful to 
man excel both their progenitors, and in some countries, and 
for certain kinds of work, are in greater requisition than either. 
Although occasional instances have been recorded of female Mules 
breeding with the males of one or other of the pure species, it is 
doubtful if any case has occurred of their breeding inter se, although 
the opportunities of doing so must have been great, as Mules have 
been reared in immense numbers for at least several thousands of 
years. We may therefore consider it settled that the different 
species of the group are now in that degree of physiological differ- 
entiation which enables them to produce offspring with each other, 
but does not permit of the progeny continuing the race, at all events 
unless reinforced by the aid of one of the pure forms. 
The several members of the group show mental differences 
quite as striking as those exhibited by their external form, and 
more than perhaps might be expected from the similarity of their 
