inhabitants, inhabitants, 1859 1860 1861 1866 | inhabitants 1869 1872 |
though though 1859 1860 1861 1866 |
are essentially American, though 1869 1872 |
they may be all peculiar
species, species, 1859 1860 1861 1866 | species. 1869 1872 |
are are 1859 1860 1861 1866 | are 1869 1872 |
essentially essentially 1859 1860 1861 1866 | essentially 1869 1872 |
American. American. 1859 1860 1861 1866 | American. 1869 1872 |
We may look back to past ages, as shown in the last chapter, and we find American types then
prevalent prevalent 1859 1860 1861 1866 | prevailing 1869 1872 |
on the American continent and in the American seas. We see in these facts some deep organic bond,
prevailing prevailing 1859 1860 1861 1866 | prevailing 1869 1872 |
throughout space and time, over the same areas of land and water, and
independent
of
their their 1859 1860 1861 1866 | their 1869 1872 |
physical conditions. The naturalist must
feel little curiosity, feel little curiosity, 1859 1860 1861 1866 |
be dull, 1869 1872 |
who is not led to inquire what this bond is. |
This This 1859 1860 1861 1866 | The 1869 1872 |
bond, bond, 1859 1860 1861 1866 | bond 1869 1872 |
on my theory, on my theory, 1859 1860 1861 1866 |
OMIT 1869 1872 |
is simply inheritance, that cause which alone, as far as we positively know, produces organisms quite
like, like, 1859 1860 1861 1866 | like 1869 1872 |
or, or, 1859 1860 1861 1866 |
each other, or, 1869 1872 |
as we see in the case of varieties
nearly
like each other. like each other. 1859 1860 1861 1866 |
alike. 1869 1872 |
The dissimilarity of the inhabitants of different regions may be attributed to modification through natural
selection, and
in a quite in a quite 1859 1860 1861 1866 |
in a 1869 |
probably in a 1872 |
subordinate degree to the
direct direct 1859 1860 1861 1866 | definite 1869 1872 |
influence of different physical conditions. The degree
of dissimilarity will depend on the migration of the more dominant forms of life from one region into another having been
effected with effected with 1859 1860 1861 1866 | prevented 1869 | effected with 1872 |
more or less
ease, ease, 1859 1860 1861 1866 | effectually, 1869 | effectually prevented, 1872 |
at periods more or less remote;— on the nature and number of the former immigrants;—
and on
their their 1859 1860 1861 1866 | the 1869 1872 |
action
and reaction, in their mutual struggles for life;— and reaction, in their mutual struggles for life;— 1859 1860 1861 1866 |
of the inhabitants on each other in leading to the preservation of different modifications; 1869 1872 |
the relation of organism to organism
being, being, 1859 1860 1861 1866 |
in the struggle for life being, 1869 1872 |
as I have already often remarked, the most important of all relations. Thus the high importance of barriers comes into play by checking migration; as does time for the slow process of modification through natural selection. Widely-ranging species, abounding in individuals, which have already triumphed over many competitors in their own widely-extended
homes homes 1859 1860 | homes, 1861 1866 1869 1872 |
will have the best chance of seizing on new places, when they spread into new countries. In their new homes they will be exposed to new conditions, and will frequently undergo further modification and improvement;
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