Comparison with 1861 |
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of the same species come in all respects into the closest competition with each other, the struggle will generally be most severe between them; it will be almost equally severe between the varieties of the same species, and next in severity between the species of the same genus. But
the struggle
will often be very
severe between beings
most
remote in the scale of nature. The slightest advantage in one being,
at any age or during any season, over those with which it
comes
into competition, or better adaptation in however slight a degree to the surrounding physical conditions, will
turn
the balance.
|
|
With animals having separated sexes
there will in most cases be
a struggle between the males for possession
of the females. The most vigorous individuals,
or those which have most successfully struggled with their conditions of life, will generally leave most progeny. But success will often depend on having
special weapons
or means of defence, or on the charms of the males; and the slightest
advantage will lead to victory. |
|
As geology plainly proclaims that each land has undergone great physical changes, we might have expected that
organic beings would
have varied under nature, in the same way as they generally
have varied under the changed conditions of
domestication. And if there be
any variability under nature, it would be an unaccountable fact if natural selection had
not come into play. It has often been asserted, but the assertion is quite
incapable of proof, that the amount of variation under nature is a strictly limited quantity. Man, though acting on external characters alone and often capriciously, can produce within a short period a great result by adding up mere individual differences in his domestic productions; and every one admits that there are at least
individual differences
in species under nature.
But, besides such differences, all naturalists
|
of the same species come in all respects into the closest competition with each other, the struggle will generally be most severe between them; it will be almost equally severe between the varieties of the same species, and next in severity between the species of the same genus.
But But 1859 1860 1861 1866 | On 1869 1872 |
the
struggle struggle 1859 1860 1861 1866 |
other hand the struggle 1869 1872 |
will often be
very very 1859 1860 1861 1866 1869 | very 1872 |
severe between
beings beings 1859 1860 1861 1869 1872 | being 1866 |
most most 1859 1860 1861 1866 | most 1869 1872 |
remote in the scale of nature. The slightest advantage in
one being, one being, 1859 1860 1861 1866 | certain individuals, 1869 1872 |
at any age or during any season, over those with which
it it 1859 1860 1861 1866 | they 1869 1872 |
comes comes 1859 1860 1861 1866 | come 1869 1872 |
into competition, or better adaptation in however slight a degree to the surrounding physical conditions,
will will 1859 1860 1861 1866 1869 | will, 1872 |
turn turn 1859 1860 1861 1866 1869 | in 1872 |
the
balance. balance. 1859 1860 1861 1866 1869 |
long run, turn the balance. 1872 |
|
|
With animals having separated
sexes sexes 1859 1860 1861 1866 1869 | sexes, 1872 |
there will
in most cases be in most cases be 1859 1860 1861 1866 |
be in most cases 1869 1872 |
a struggle between the males for
possession possession 1859 1860 1861 | the possession 1866 1869 1872 |
of the females. The most vigorous
individuals, individuals, 1859 1860 1861 | males, 1866 1869 1872 |
or those which have most successfully struggled with their conditions of life, will generally leave most progeny. But success will often depend on
having having 1859 1860 1861 |
the males having 1866 1869 1872 |
special
weapons weapons 1859 1860 1861 1866 | weapons, 1869 1872 |
or means of defence, or
on the charms of the males; and the slightest on the charms of the males; and the slightest 1859 1860 1861 |
on their charms; and the slighest 1866 |
charms; and a slight 1869 1872 |
advantage will lead to victory. |
|
As geology plainly proclaims that each land has undergone great physical changes, we might have expected
that that 1859 1860 1861 1866 |
to find that 1869 1872 |
organic beings
would would 1859 1860 1861 1866 | would 1869 1872 |
have varied under nature, in the same way as they
generally generally 1859 1860 1861 1866 | generally 1869 1872 |
have varied under
the changed conditions of the changed conditions of 1859 1860 1861 1866 |
OMIT 1869 1872 |
domestication. And if there
be be 1859 1860 1861 1866 1869 | has been 1872 |
any variability under nature, it would be an unaccountable fact if natural selection
had had 1859 1860 1861 1866 1872 | did 1869 |
not come into play. It has often been asserted, but the assertion is
quite quite 1859 1860 1861 1866 | quite 1869 1872 |
incapable of proof, that the amount of variation under nature is a strictly limited quantity. Man, though acting on external characters alone and often capriciously, can produce within a short period a great result by adding up mere individual differences in his domestic productions; and every one admits that
there are at least there are at least 1859 1860 1861 1866 |
species present 1869 1872 |
individual
differences differences 1859 1860 1861 1866 | differences. 1869 1872 |
in in 1859 1860 1861 1866 | in 1869 1872 |
species species 1859 1860 1861 1866 | species 1869 1872 |
under under 1859 1860 1861 1866 | under 1869 1872 |
nature. nature. 1859 1860 1861 1866 | nature. 1869 1872 |
But, besides such differences, all naturalists
|