| → are essentially American, though 1869 1872 |
| though 1859 1860 1861 1866 |
|
| → be dull, 1869 1872 |
| feel little curiosity, 1859 1860 1861 1866 |
|
| → OMIT 1869 1872 |
| on my theory, 1859 1860 1861 1866 |
|
| → each other, or, 1869 1872 |
| or, 1859 1860 1861 1866 |
|
| → alike. 1869 1872 |
| like each other. 1859 1860 1861 1866 |
|
| → natural 1859 1860 1861 1866 1869 |
| variation and natural 1872 |
|
| → in a 1869 |
| in a quite 1859 1860 1861 1866 |
| probably in a 1872 |
|
| → of the inhabitants on each other in leading to the preservation of different modifications; 1869 1872 |
| and reaction, in their mutual struggles for life;— 1859 1860 1861 1866 |
|
| → in the struggle for life being, 1869 1872 |
| being, 1859 1860 1861 1866 |
|
|
→are essentially American, though
they may be all peculiar
We may look back to past ages, as shown in the last chapter, and we find American types then
on the American continent and in the American seas. We see in these facts some deep organic bond,
throughout space and time, over the same areas of land and water,
of
physical conditions. The naturalist must
→be dull,
who is not led to inquire what this bond is. |
|
|
→OMIT
is simply inheritance, that cause which alone, as far as we positively know, produces organisms quite
→each other, or,
as we see in the case of
nearly
→alike. The dissimilarity of the inhabitants of different regions may be attributed to modification through
→natural
selection, and
→in a
subordinate degree to the
influence of different physical conditions. The
of dissimilarity will depend on the migration of the more dominant forms of life from one region into another having been
more or less
at periods more or less remote;— on the nature and number of the former
and on
action
→of the inhabitants on each other in leading to the preservation of different modifications;
the relation of organism to organism
→in the struggle for life being,
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
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;
|
