the inference that he attaches much value to
the craniological distinctions. We shall take an opportunity presently
of recurring to this subject. We will now take some of the most
interesting instances, given by Dr Prichard, of structural changes and
hereditary instincts, acquired by domesticated animals, and again lost
by them on returning to a wild state:--

"Swine transported from Europe to America, since the discovery of
the western continent by the Spaniards in the fourteenth century,
and wandering at large in the vast forests of the New World, and
feeding on wild fruits, have resumed the manner of existence which
belonged to the original stock. Their appearance nearly resembles
that of the wild boar. Their ears have become erect; their heads
are larger, and the foreheads vaulted at the upper part; their
colour has lost the variety found in the domestic breeds. The wild
hogs of the American forests are uniformly black. The hog which
inhabits the high mountains of Paramos bears a striking resemblance
to the wild boar of France. His skin is covered with a thick fur,
often somewhat crisp, beneath which is found, in some individuals,
a species of wool. From excessive cold and defect of nourishment,
the hog of that region is of small and stunted figure. In some warm
parts of America, the swine are not uniformly black, as above
described, but red, like the young pecari. At Melgara and other
places, there are some which are not entirely black, but have a
white band under the belly reaching up to the back; they are termed
_cinchados_. The restoration of the original character of the wild
boar in a race descended from domesticated swine, removes all
reason for doubt, if any had really existed, as to the identity of
the stock; and we may safely proceed to compare the physical
characters of these races, as varieties which have arisen in one
species. The restoration of one uniform black colour, and the
change of thin sparse hair and bristles for a thick fur with a
covering of wool, are facts that must be noticed in the
observations of M. Roulin. The difference in the shape of the head
between the wild and domestic hog of America, is very remarkable.
Blumenbach long ago pointed out the great difference between the
cranium of our swine and that of the primitive wild boar. He