Comparison with 1869 |
|
modifications modifications 1869 | modification 1859 1860 1861 1866 1872 |
of some kind. The existence of such places will often depend on physical changes, which are generally very slow, and on the immigration of better adapted forms
being being 1869 | having been 1859 1860 1861 1866 |
checked. But the effects of natural selection will probably still oftener depend on some few of the inhabitants becoming slowly modified; the mutual relations of the other inhabitants being thus disturbed. ↑2 blocks not present in 1859 1860 1861 1866 1869; present in 1872 | The occurrence of such places will often depend on physical changes, which generally take place very slowly, and on the immigration of better adapted forms being prevented.
As some few of the old inhabitants become modified, the mutual relations of others will often be disturbed; and this will create new places, ready to be filled up by better adapted forms; but all this will take place very slowly.
|
Although all the individuals of the same species differ in some slight degree
from each other, it would often be long before
differences of the right nature
in various parts of the organisation might
occur. The result
would
often be greatly retarded by free intercrossing.
↑3 blocks not present in 1869 1872; present in 1859 1860 1861 1866 | But the action of natural selection will probably still oftener depend on some of
the inhabitants becoming slowly modified; the mutual relations of many of the other inhabitants being thus disturbed.
Nothing can be effected, unless favourable variations occur, and variation itself is apparently always a very
slow process.
The process will often be greatly retarded by free intercrossing.
|
Many will exclaim that these several causes are amply sufficient
....... 1869 1872 | wholly 1859 1860 1861 1866 |
to
neutralise neutralise 1869 1872 | stop 1859 1860 1861 1866 |
the
power power 1869 1872 | action 1859 1860 1861 1866 |
of natural selection. I do not believe so.
But But 1869 1872 |
On the other hand, 1859 1860 1861 1866 |
I do believe that natural selection
generally generally 1869 | will always 1859 | always 1860 1861 1866 | will generally 1872 |
act
very
slowly slowly 1869 | slowly, 1859 1860 1861 1866 1872 |
in effecting changes, at in effecting changes, at 1869 |
often only at 1859 1860 1861 |
generally at only 1866 |
only at 1872 |
long intervals of time, and
only only 1869 1872 | generally 1859 1860 1861 1866 |
on
....... 1869 1872 | only 1859 1860 1861 1866 |
a
....... 1869 1872 | very 1859 1860 1861 1866 |
few of the inhabitants of the same
region. region. 1869 1872 | region 1859 1860 1861 1866 |
....... 1869 1872 | at 1859 1860 1861 1866 |
....... 1869 1872 | the 1859 1860 1861 1866 |
....... 1869 1872 | same 1859 1860 1861 1866 |
....... 1869 1872 | time. 1859 1860 1861 1866 |
I further
believe believe 1869 1872 | believe, 1859 1860 1861 1866 |
that
these these 1869 1872 | this very 1859 1860 | this 1861 1866 |
slow, intermit- tent results of natural selection accord perfectly results of natural selection accord perfectly 1869 |
action of natural selection accords perfectly 1859 1860 1861 1866 |
results accord 1872 |
well
with what geology tells us of the rate and manner at which the inhabitants of this
world have changed. |
|
Slow though the process of selection may be, if feeble man can do much by
...OMIT 1869 1872 |
his powers of 1859 1860 1861 1866 |
artificial selection, I can see no limit to the amount of change, to the beauty and infinite
complexity of the coadaptations between all organic beings, one with another and with their physical conditions of life, which may be
effected
in the long course of time by
nature's power of
selection or the survival of the fittest. selection or the survival of the fittest. 1869 |
selection. 1859 1860 1861 1866 |
selection, that is by the survival of the fittest. 1872 |
|
Extinction caused by Natural Selection.
Extinction caused by Natural Selection.
1869 |
Extinction
.—
1859 |
Extinction.
—
1860 1861 |
Extinction caused by Natural Selection. 1866 1872 |
|
This subject will be more fully discussed in our chapter on Geology; but it must be here
alluded to from being intimately connected with natural selection.
|
modification modification 1859 1860 1861 1866 1872 | modifications 1869 |
of some
kind. kind. 1859 1860 1861 1866 1869 |
of its existing inhabitants. 1872 |
The existence of such places will often depend on physical changes, which are generally very slow, and on the immigration of better adapted forms
having been having been 1859 1860 1861 1866 | being 1869 |
checked. ↑1 blocks not present in 1859 1860 1861 1866 1872; present in 1869 | But the effects of natural selection will probably still oftener depend on some few of the inhabitants becoming slowly modified; the mutual relations of the other inhabitants being thus disturbed.
|
But the action of natural selection will probably still oftener depend on some
few of few of 1861 1866 | of 1859 1860 |
the inhabitants becoming slowly modified; the mutual relations of many of the other inhabitants being thus disturbed. Nothing can be effected, unless favourable variations occur, and variation itself is apparently always a
....... 1861 1866 | very 1859 1860 |
slow process. The process will often be greatly retarded by free intercrossing. Many will exclaim that these several causes are amply sufficient
wholly wholly 1859 1860 1861 1866 | wholly 1869 1872 |
to
stop stop 1859 1860 1861 1866 | neutralise 1869 1872 |
the
action action 1859 1860 1861 1866 | power 1869 1872 |
of natural selection. I do not believe so.
On the other hand, On the other hand, 1859 1860 1861 1866 |
But 1869 1872 |
I do believe that natural selection
always always 1860 1861 1866 | will always 1859 | generally 1869 | will generally 1872 |
acts acts 1860 1861 1866 1869 | act 1859 1872 |
very
slowly, slowly, 1859 1860 1861 1866 1872 | slowly 1869 |
generally at only generally at only 1866 |
often only at 1859 1860 1861 |
in effecting changes, at 1869 |
only at 1872 |
long intervals of time, and
generally generally 1859 1860 1861 1866 | only 1869 1872 |
on
only only 1859 1860 1861 1866 | only 1869 1872 |
a
very very 1859 1860 1861 1866 | very 1869 1872 |
few of the inhabitants of the same
region region 1859 1860 1861 1866 | region. 1869 1872 |
at at 1859 1860 1861 1866 | at 1869 1872 |
the the 1859 1860 1861 1866 | the 1869 1872 |
same same 1859 1860 1861 1866 | same 1869 1872 |
time. time. 1859 1860 1861 1866 | time. 1869 1872 |
I further
believe, believe, 1859 1860 1861 1866 | believe 1869 1872 |
that
this this 1861 1866 | this very 1859 1860 | these 1869 1872 |
slow,
intermittent intermittent 1866 1869 1872 | intermit- tent 1859 1860 | inter- mittent 1861 |
action of natural selection accords perfectly action of natural selection accords perfectly 1859 1860 1861 1866 |
results of natural selection accord perfectly 1869 |
results accord 1872 |
....... 1866 1869 | well 1859 1860 1861 1872 |
with what geology tells us of the rate and manner at which the inhabitants of
the the 1861 1866 1869 1872 | this 1859 1860 |
world have changed. |
|
Slow though the process of selection may be, if feeble man can do much by
his powers of his powers of 1859 1860 1861 1866 |
OMIT 1869 1872 |
artificial selection, I can see no limit to the amount of change, to the beauty and
infinite infinite 1859 1860 1861 1866 1869 | infinite 1872 |
complexity of the coadaptations between all organic beings, one with another and with their physical conditions of life, which may
be be 1859 1860 1861 1866 1869 | have been 1872 |
effected effected 1859 1860 1861 1866 1869 | affected 1872 |
in the long course of time
by by 1859 1860 1861 1866 1869 | through 1872 |
nature's power of
selection. selection. 1859 1860 1861 1866 |
selection or the survival of the fittest. 1869 |
selection, that is by the survival of the fittest. 1872 |
|
Extinction caused by Natural Selection.
Extinction caused by Natural Selection. 1866 1872 |
Extinction
.—
1859 |
Extinction.
—
1860 1861 |
Extinction caused by Natural Selection.
1869 |
|
This subject will be more fully discussed in our chapter on Geology; but it must
be here be here 1859 1860 1861 1866 1869 | here be 1872 |
alluded to from being intimately connected with natural selection.
|