→ balance. 1859 1860 1861 1866 1869 |
long run, turn the balance. 1872 |
|
→ in most cases be 1859 1860 1861 1866 |
be in most cases 1869 1872 |
|
→ the males having 1866 1869 1872 |
having 1859 1860 1861 |
|
→ on their charms; and the slighest 1866 |
on the charms of the males; and the slightest 1859 1860 1861 |
charms; and a slight 1869 1872 |
|
→ that 1859 1860 1861 1866 |
to find that 1869 1872 |
|
→ the changed conditions of 1859 1860 1861 1866 |
OMIT 1869 1872 |
|
→ there are at least 1859 1860 1861 1866 |
species present 1869 1872 |
|
→ have admitted the existence of varieties, which they have considered 1861 1866 |
have admitted the existence of varieties, which they think 1859 1860 |
admit that varieties exist, which are considered 1869 |
admit that natural varieties exist, which are considered 1872 |
|
slightest advantage in
at any age or during any season, over those with which
into competition, or better adaptation in however slight a degree to the surrounding physical conditions,
the
→balance.
|
|
With animals having separated
there will
→in most cases be
a struggle between the males for
of the females. The most vigorous
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
special
or means of defence, or
→on their charms; and the slighest
advantage will lead to victory. |
|
As geology plainly proclaims that each land has undergone great physical changes, we might have expected
→that
organic beings
have varied under nature, in the same way as they
have varied under
→the changed conditions of
domestication. And if there
any variability under nature, it would be an unaccountable fact if natural selection
not come into play. It has often been asserted, but the assertion is
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
But, besides such differences, all naturalists
→have admitted the existence of varieties, which they have considered
sufficiently distinct to be worthy of record in
works. No one
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
|