Comparison with 1859 |
|
produced by secondary laws. On this same view we can understand how it is that in
each each 1859 1860 1861 1866 1869 | a 1872 |
region where many species of a genus have been produced, and where they now flourish, these same species should present many varieties; for where the manufactory of species has been active, we might expect, as a general rule, to find it still in action; and this is the case if varieties be incipient species. Moreover, the species of the larger genera, which afford the greater
number of varieties or incipient species, retain to a certain degree the character of varieties; for they differ from each other by a less amount of difference than do the species of smaller genera. The closely allied species also of the larger genera apparently have restricted ranges, and
they they 1859 |
in their affinities they 1860 1861 1866 1869 1872 |
are clustered in little groups round other species— in
which which 1859 1860 1861 |
both of which 1866 1869 |
both 1872 |
respects
they they 1859 1860 1861 1866 1869 | they 1872 |
resemble resemble 1859 1860 1861 1866 1869 | resembling 1872 |
varieties. These are strange relations on the view
of of 1859 1860 1861 | that 1866 1869 1872 |
each species
having been having been 1859 1860 1861 | was 1866 1869 1872 |
independently created, but are intelligible if
all species first existed as all species first existed as 1859 1860 1861 |
each existed first as a 1866 1869 1872 |
varieties. varieties. 1859 1860 1861 | variety. 1866 1869 1872 |
|
|
As each species tends by its geometrical
ratio ratio 1859 1860 1861 1866 1869 | rate 1872 |
of reproduction to increase inordinately in number; and as the modified descendants of each species will be enabled to increase by
so so 1859 1860 1861 1866 1869 | as 1872 |
much
the more the more 1859 1860 1861 1866 1869 | the more 1872 |
as they become more
diversified in habits and structure, so as to be
enabled enabled 1859 1860 1861 1866 1869 | able 1872 |
to seize on many and widely different places in the economy of nature, there will be a constant tendency in natural selection to preserve the most divergent offspring of any one species.
Hence Hence 1859 1860 1861 | Hence, 1866 1869 1872 |
during a long-continued course of modification, the slight
differences, differences, 1859 1860 1861 1866 1869 | differences 1872 |
characteristic of varieties of the same species, tend to be augmented into the greater differences characteristic of
species species 1859 1860 1861 | the species 1866 1869 1872 |
of the same genus. New and improved varieties will inevitably supplant and exterminate the older, less
improved improved 1859 1860 1861 1866 1869 | improved, 1872 |
and intermediate varieties; and thus species are rendered to a large extent defined and distinct objects. Dominant species belonging to the larger groups
tend tend 1859 1860 |
within each class tend 1861 1866 1869 1872 |
to give birth to new and dominant forms; so that each large group tends to become still larger, and at the same time more divergent in character. But as all groups cannot thus
succeed in succeed in 1859 1860 1861 1866 1869 | go on 1872 |
increasing in size, for the world would not hold them, the more dominant groups beat the less dominant. This tendency in the large groups to go on increasing in size and diverging in character, together with the
almost almost 1859 1860 1861 1866 1869 | almost 1872 |
inevitable contingency of much extinction, explains the arrangement of all the forms of
life, life, 1859 1860 1861 1866 1869 | life 1872 |
in groups subordinate to groups, all within a few great classes, which
we now see everywhere around us, and which we now see everywhere around us, and which 1859 1860 |
OMIT 1861 1866 1869 1872 |
has prevailed throughout all time. This grand fact of the grouping of all organic beings
seems to me seems to me 1859 1860 |
is 1861 1866 |
under what is called the Natural System, is 1869 1872 |
utterly inexplicable on the theory of creation. |
|
As natural selection acts solely by accumulating slight, successive, favourable variations, it can produce no great or sudden
modification; modification; 1859 1860 1861 1866 1869 | modifica- tions; 1872 |
|
produced by secondary laws. On this same view we can understand how it is that in
a a 1872 | each 1859 1860 1861 1866 1869 |
region where many species of a genus have been produced, and where they now flourish, these same species should present many varieties; for where the manufactory of species has been active, we might expect, as a general rule, to find it still in action; and this is the case if varieties be incipient species. Moreover, the species of the larger genera, which afford the
greater greater 1859 1860 1861 1869 1872 | great 1866 |
number of varieties or incipient species, retain to a certain degree the character of varieties; for they differ from each other by a less amount of difference than do the species of smaller genera. The closely allied species also of the larger genera apparently have restricted ranges, and
in their affinities they in their affinities they 1860 1861 1866 1869 1872 |
they 1859 |
are clustered in little groups round other species— in
both both 1872 |
which 1859 1860 1861 |
both of which 1866 1869 |
respects
....... 1872 | they 1859 1860 1861 1866 1869 |
resembling resembling 1872 | resemble 1859 1860 1861 1866 1869 |
varieties. These are strange relations on the view
that that 1866 1869 1872 | of 1859 1860 1861 |
each species
was was 1866 1869 1872 | having been 1859 1860 1861 |
independently created, but are intelligible if
each existed first as a each existed first as a 1866 1869 1872 |
all species first existed as 1859 1860 1861 |
variety. variety. 1866 1869 1872 | varieties. 1859 1860 1861 |
|
|
As each species tends by its geometrical
rate rate 1872 | ratio 1859 1860 1861 1866 1869 |
of reproduction to increase inordinately in number; and as the modified descendants of each species will be enabled to increase by
as as 1872 | so 1859 1860 1861 1866 1869 |
much
....... 1872 | the more 1859 1860 1861 1866 1869 |
as they become
more more 1859 1872 | more 1860 1861 1866 1869 |
diversified in habits and structure, so as to be
able able 1872 | enabled 1859 1860 1861 1866 1869 |
to seize on many and widely different places in the economy of nature, there will be a constant tendency in natural selection to preserve the most divergent offspring of any one species.
Hence, Hence, 1866 1869 1872 | Hence 1859 1860 1861 |
during a long-continued course of modification, the slight
differences differences 1872 | differences, 1859 1860 1861 1866 1869 |
characteristic of varieties of the same species, tend to be augmented into the greater differences characteristic of
the species the species 1866 1869 1872 | species 1859 1860 1861 |
of the same genus. New and improved varieties will inevitably supplant and exterminate the older, less
improved, improved, 1872 | improved 1859 1860 1861 1866 1869 |
and intermediate varieties; and thus species are rendered to a large extent defined and distinct objects. Dominant species belonging to the larger groups
within each class tend within each class tend 1861 1866 1869 1872 |
tend 1859 1860 |
to give birth to new and dominant forms; so that each large group tends to become still larger, and at the same time more divergent in character. But as all groups cannot thus
go on go on 1872 | succeed in 1859 1860 1861 1866 1869 |
increasing in size, for the world would not hold them, the more dominant groups beat the less dominant. This tendency in the large groups to go on increasing in size and diverging in character, together with the
....... 1872 | almost 1859 1860 1861 1866 1869 |
inevitable contingency of much extinction, explains the arrangement of all the forms of
life life 1872 | life, 1859 1860 1861 1866 1869 |
in groups subordinate to groups, all within a few great classes, which
...OMIT 1861 1866 1869 1872 |
we now see everywhere around us, and which 1859 1860 |
has prevailed throughout all time. This grand fact of the grouping of all organic beings
under what is called the Natural System, is under what is called the Natural System, is 1869 1872 |
seems to me 1859 1860 |
is 1861 1866 |
utterly inexplicable on the theory of creation. |
|
As natural selection acts solely by accumulating slight, successive, favourable variations, it can produce no great or sudden
modifica- tions; modifica- tions; 1872 | modification; 1859 1860 1861 1866 1869 |
|