CHAPTER III.
WE endeavoured in the last chapter to show, that a belief in the reality of
species is not inconsistent with the idea of a considerable degree of
variability in the specific character. This opinion, indeed, is little more than
an extension of the idea which we must entertain of the identity of an
individual, throughout the changes which it is capable of undergoing.
If a quadruped, inhabiting a cold northern latitude, and covered with a warm
coat of hair or wool, be transported to a southern climate, it will often, in
the course of a few years, shed a considerable portion of its coat, which it
gradually recovers on being again restored to its native country. Even there the
same changes are, perhaps, superinduced to a certain extent by the returns of
winter and summer. We know that the Alpine hare * and the ermine † become white
during winter, and again obtain their full colour during the warmer season ;
that the plumage of the ptarmigan undergoes a like metamorphosis in colour and
quantity, and that the change is equally temporary. We are aware that, if we
reclaim some wild animal, and modify its habits and instincts by domestication,
it may, if it escapes, become in a few years nearly as wild and untractable as
ever ; and if the same individual be again retaken, it may be reduced to its
former tame state. A plant is placed in a prepared soil in order that the petals
of its flowers may multiply, and their colour be heightened or changed ; if we
* Lepus variabilis. - Pallas.
† Mustela erminea. - Linn.
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