ence two or more species have sprung, need in no respect be
intermediate between these species. If any two species have arisen from
a common stock in the same way as the carrier and the pouter, say, have
arisen from the rock-pigeon, then the common stock of these two species
need be no more intermediate between the two than the rock-pigeon is
between the carrier and pouter. Clearly appreciate the force of this
analogy, and all the arguments against the origin of species by
selection, based on the absence of transitional forms, fall to the
ground. And Mr. Darwin's position might, we think, have been even
stronger than it is if he had not embarrassed himself with the aphorism,
"_Natura non facit saltum_," which turns up so often in his pages. We
believe, as we have said above, that Nature does make jumps now and
then, and a recognition of the fact is of no small importance in
disposing of many minor objections to the doctrine of transmutation.

But we must pause. The discussion of Mr. Darwin's arguments in detail
would lead us far beyond the limits within which we proposed, at
starting, to confine this article. Our object has been attained if we
have given an intelligible, however brief, account of the established
facts connected with species, and of the relation of the explanation of
those facts offered by Mr. Darwin to the theoretical views held by his
predecessors and his contemporaries, and, above all, to the requirements
of scientific logic. We have ventured to point out that it does not, as
yet, satisfy all those requirements; but we do not hesitate to assert
that it is as superior to any preceding or contemporary hypothesis, in
the extent of observational and experimental basis on which it rests, in
its rigorously scientific method, and in its power of explaining
biological phaenomena, as was the hypothesis of Copernicus to the
speculations of Ptolemy. But the planetary orbits turned out to be not
quite circular after all, and, grand as was the service Copernicus
rendered to science, Kepler and Newton had to come after him. What if
the orbit of Darwinism should be a little too circular? What if species
should offer residual phaenomena, here and there, not explicable by
natural selection? Twenty years hence naturalists may be in a position
to say whether this is, or is not, the case; but in either event they
will owe the author of "The Origin of Species" an immense debt of
gratitude. We should leave a very wrong impr