Comparison with 1861 |
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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
in their affinities they in their affinities they 1860 1861 1866 1869 1872 |
they 1859 |
are clustered in little groups round other species— in which
respects they
resemble
varieties. These are strange relations on the view of
each species having been
independently created, but are intelligible if all species first existed as
varieties.
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|
As each species tends by its geometrical ratio
of reproduction to increase inordinately in number; and as the modified descendants of each species will be enabled to increase by so
much the more
as they become
....... 1860 1861 1866 1869 | more 1859 1872 |
diversified in habits and structure, so as to be enabled
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
during a long-continued course of modification, the slight differences,
characteristic of varieties of the same species, tend to be augmented into the greater differences characteristic of species
of the same genus. New and improved varieties will inevitably supplant and exterminate the older, less improved
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
|
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
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 more 1859 1872 | more 1860 1861 1866 1869 |
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
|