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will generally be 1859 1860 1861
generally are the 1866
are the 1869 1872

under the most different climates; 1859 1860 1861
and in the northern and southern temperate zones; 1866 1869 1872

of life, 1859 1860
as closely similar as the same species ever require, 1861 1866 1869 1872

from some third source or from each other, 1859 1860 1861 1866
OMIT 1869 1872

the 1859 1860 1861 1866
from some other country or from each other, the 1869 1872

should be peculiar. 1859 1860 1861
are peculiar or endemic forms. 1866 1869 1872

those 1859 1860 1861
species of those groups of 1866
species belonging to those groups of 1869 1872

should so often be 1859 1860 1861
are so often 1866 1869
are often 1872

modification have been the same. We see the full meaning of the wonderful fact, which
has
must have
struck every traveller, namely, that on the same continent, under the most diverse conditions, under heat and cold, on mountain and lowland, on deserts and marshes, most of the inhabitants within each great class are plainly related; for they will generally be descendants of the same progenitors and early colonists. On this same principle of former migration, combined in most cases with modification, we can understand, by the aid of the Glacial period, the identity of some few plants, and the close alliance of many others, on the most distant mountains, under the most different climates; and likewise the close alliance of some of the inhabitants of the sea in the northern and southern temperate
latitudes,
zones,
though separated by the whole intertropical ocean. Although two
countries
areas
may present
the same
the same
physical conditions of life, we need feel no surprise at their inhabitants being widely different, if they have been for a long period completely
sundered
separated
from each other; for as the relation of organism to organism is the most important of all relations, and as the two
countries
areas
will have received colonists from some third source or from each other, at various periods and in different proportions, the course of modification in the two areas will inevitably
have been
be
different.
On this view of migration, with subsequent modification, we
can
can
see why oceanic islands
are
should be
inhabited by
only few
few
species, but of these,
why
that
many should be peculiar. We
can
can
clearly see why those animals which cannot cross wide spaces of
the ocean,
ocean,
as frogs and terrestrial mammals,
do
should
not inhabit oceanic islands; and why, on the other hand, new and peculiar species of bats,
animals which
which
can traverse the ocean, should so often be found on islands far distant from any continent. Such
cases
facts