quently appear along the spine, across the legs, and on the
shoulders, where they are occasionally double or treble, and even
sometimes on the face and body of horses of all breeds and of all
colours. But the stripes appear most frequently on the various kinds of
duns. They may sometimes plainly be seen on foals, and subsequently
disappear. The dun-colour and the stripes are strongly transmitted when
a horse thus characterised is crossed with any other; but I was not
able to prove that striped duns are generally produced from the
crossing of two distinct breeds, neither of which are duns, though this
does sometimes occur.

The legs of the ass are often striped, and this may be considered as a
reversion to the wild parent-form, the _Asinus taeniopus_ of
Abyssinia,[94] which is thus striped. In the domestic animal the
stripes on the shoulder are occasionally double, or forked at the
extremity, as in certain zebrine {42} species. There is reason to
believe that the foal is frequently more plainly striped on the legs
than the adult animal. As with the horse, I have not acquired any
distinct evidence that the crossing of differently-coloured varieties
of the ass brings out the stripes.

But now let us turn to the result of crossing the horse and ass.
Although mules are not nearly so numerous in England as asses, I have
seen a much greater number with striped legs, and with the stripes far
more conspicuous than in either parent-form. Such mules are generally
light-coloured, and might be called fallow-duns. The shoulder-stripe in
one instance was deeply forked at the extremity, and in another
instance was double, though united in the middle. Mr. Martin gives a
figure of a Spanish mule with strong zebra-like marks on its legs,[95]
and remarks, that mules are particularly liable to be thus striped on
their legs. In South America, according to Roulin,[96] such stripes are
more frequent and conspicuous in the mule than in the ass. In the
United States, Mr. Gosse,[97] speaking of these animals, says, "that in
a great number, perhaps in nine out of every ten, the legs are banded
with transverse dark stripes."

Many years ago I saw in the Zoological Gardens a curious triple hybrid,
from a bay mare, by a hybrid from a male ass and female zebra. This
animal when old had hardly any stripes; but I w