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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
certain individuals,
one being,
at any age or during any season, over those with which
they
it
come
comes
into competition, or better adaptation in however slight a degree to the surrounding physical conditions,
will,
will
in
turn
the balance.
With animals having separated
sexes,
sexes
there will in most cases be a struggle between the males for
possession
the possession
of the females. The most vigorous
individuals,
males,
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
weapons,
weapons
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
would
would
have varied under nature, in the same way as they
generally
generally
have varied under the changed conditions of domestication. And if there
has been
be
any variability under nature, it would be an unaccountable fact if natural selection
did
had
not come into play. It has often been asserted, but the assertion is
quite
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.
differences
in
in
species
species
under
under
nature.
nature.
But, besides such differences, all naturalists have admitted the existence of varieties, which they have considered sufficiently distinct to be worthy of record in
systematic
their systematic
works. No one
has
can
drawn
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