| → feel little curiosity, 1859 1860 1861 1866 |
| be dull, 1869 1872 |
|
| → on my theory, 1859 1860 1861 1866 |
| OMIT 1869 1872 |
|
| → or, 1859 1860 1861 1866 |
| each other, or, 1869 1872 |
|
| → like each other. 1859 1860 1861 1866 |
| alike. 1869 1872 |
|
| → natural 1859 1860 1861 1866 1869 |
| variation and natural 1872 |
|
| → in a quite 1859 1860 1861 1866 |
| in a 1869 |
| probably in a 1872 |
|
| → 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 |
|
| → being, 1859 1860 1861 1866 |
| in the struggle for life being, 1869 1872 |
|
|
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
→feel little curiosity,
who is not led to inquire what this bond is. |
|
|
→on my theory,
is simply inheritance, that cause which alone, as far as we positively know, produces organisms quite
→or,
as we see in the case of
nearly
→like each other. The dissimilarity of the inhabitants of different regions may be attributed to modification through
→natural
selection, and
→in a quite
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
→and reaction, in their mutual struggles for life;—
the relation of organism to organism
→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; and thus they will become still further victorious, and will produce groups of modified descendants. On this
|
