We cannot maintain that such species have been created alike, in correspondence with the nearly similar physical conditions of the areas; for if we compare, for instance, certain parts of South America with parts of South Africa or Australia, we see countries closely similar in all their physical conditions, with their inhabitants utterly dissimilar.

But we must return to our more immediate subject.

I am convinced that Forbes's view may be largely extended.

In Europe we meet with the plainest evidence of the Glacial period, from the western shores of Britain to the Ural range, and southward to the Pyrenees.

We may infer from the frozen mammals and nature of the mountain vegetation, that Siberia was similarly affected.