Comparison with 1872 |
|
With animals having separated
sexes, sexes, 1872 | sexes 1859 1860 1861 1866 1869 |
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
has been has been 1872 | be 1859 1860 1861 1866 1869 |
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
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
admit that natural varieties exist, which are considered admit that natural varieties exist, which are considered 1872 |
have admitted the existence of varieties, which they think 1859 1860 |
have admitted the existence of varieties, which they have considered 1861 1866 |
admit that varieties exist, which are considered 1869 |
sufficiently distinct to be worthy of record in systematic
works. No one can
draw
any clear distinction between individual differences and slight varieties; or between more plainly marked varieties and sub-species, and species. On separate continents, and on different parts of the same continent when divided by barriers of any kind, and on outlying islands,
what a multitude
of forms exist, which some experienced naturalists rank as varieties,
others as geographical races or sub-species, and others as distinct, though closely allied species! ↑1 blocks not present in 1866 1869 1872; present in 1859 1860 1861 | Let it be observed how naturalists differ in the rank which they assign to the many representative forms in Europe and North America.
|
|
|
If
then, then, 1872 | then 1859 1860 1861 1866 1869 |
animals and plants do vary, let it be ever so slightly or slowly, animals and plants do vary, let it be ever so slightly or slowly, 1872 |
we have under nature variability and a powerful agent always ready to act and select, 1859 1860 |
we have variability as well as a powerful agent always ready to act, 1861 |
animals and plants do vary, let it be ever so slowly or so little, 1866 |
animals and plants do vary, let it be ever so little or so slowly, 1869 |
|
With animals having separated
sexes sexes 1859 1860 1861 1866 1869 | sexes, 1872 |
there will
be in most cases be in most cases 1869 1872 |
in most cases be 1859 1860 1861 1866 |
a struggle between the males for
the possession the possession 1866 1869 1872 | possession 1859 1860 1861 |
of the females. The most vigorous
males, males, 1866 1869 1872 | individuals, 1859 1860 1861 |
or those which have most successfully struggled with their conditions of life, will generally leave most progeny. But success will often depend on
the males having the males having 1866 1869 1872 |
having 1859 1860 1861 |
special
weapons, weapons, 1869 1872 | weapons 1859 1860 1861 1866 |
or means of defence, or
charms; and a slight charms; and a slight 1869 1872 |
on the charms of the males; and the slightest 1859 1860 1861 |
on their charms; and the slighest 1866 |
advantage will lead to victory. |
|
As geology plainly proclaims that each land has undergone great physical changes, we might have expected
to find that to find that 1869 1872 |
that 1859 1860 1861 1866 |
organic beings
....... 1869 1872 | would 1859 1860 1861 1866 |
have varied under nature, in the same way as they
....... 1869 1872 | generally 1859 1860 1861 1866 |
have varied under
...OMIT 1869 1872 |
the changed conditions of 1859 1860 1861 1866 |
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
did did 1869 | had 1859 1860 1861 1866 1872 |
not come into play. It has often been asserted, but the assertion is
....... 1869 1872 | quite 1859 1860 1861 1866 |
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
species present species present 1869 1872 |
there are at least 1859 1860 1861 1866 |
individual
differences. differences. 1869 1872 | differences 1859 1860 1861 1866 |
....... 1869 1872 | in 1859 1860 1861 1866 |
....... 1869 1872 | species 1859 1860 1861 1866 |
....... 1869 1872 | under 1859 1860 1861 1866 |
....... 1869 1872 | nature. 1859 1860 1861 1866 |
But, besides such differences, all naturalists
admit that varieties exist, which are considered admit that varieties exist, which are considered 1869 |
have admitted the existence of varieties, which they think 1859 1860 |
have admitted the existence of varieties, which they have considered 1861 1866 |
admit that natural varieties exist, which are considered 1872 |
sufficiently distinct to be worthy of record in
systematic systematic 1859 1860 1869 1872 | their systematic 1861 1866 |
works. No one
has has 1869 1872 | can 1859 1860 1861 1866 |
drawn drawn 1869 1872 | draw 1859 1860 1861 1866 |
any clear distinction between individual differences and slight varieties; or between more plainly marked varieties and sub-species, and species. On separate continents, and on different parts of the same continent when divided by barriers of any kind, and on
outlying islands, outlying islands, 1869 1872 |
the several islands in the same archipelago, 1866 |
what a
multitude multitude 1869 1872 | host 1866 |
of forms exist, which some experienced naturalists rank as
varieties, varieties, 1869 1872 | mere varieties, 1866 |
others as geographical races or sub-species, and others as distinct, though closely allied species! ↑1 blocks not present in 1866 1869 1872; present in 1859 1860 1861 | Let it be observed how naturalists differ in the rank which they assign to the many representative forms in Europe and North America.
|
|
|
If
then then 1859 1860 1861 1866 1869 | then, 1872 |
animals and plants do vary, let it be ever so little or so slowly, animals and plants do vary, let it be ever so little or so slowly, 1869 |
we have under nature variability and a powerful agent always ready to act and select, 1859 1860 |
we have variability as well as a powerful agent always ready to act, 1861 |
animals and plants do vary, let it be ever so slowly or so little, 1866 |
animals and plants do vary, let it be ever so slightly or slowly, 1872 |
|